diff options
Diffstat (limited to 'drivers/infiniband/core/cma.c')
| -rw-r--r-- | drivers/infiniband/core/cma.c | 5455 |
1 files changed, 5455 insertions, 0 deletions
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c new file mode 100644 index 000000000..0773ca7ac --- /dev/null +++ b/drivers/infiniband/core/cma.c @@ -0,0 +1,5455 @@ +// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB +/* + * Copyright (c) 2005 Voltaire Inc. All rights reserved. + * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved. + * Copyright (c) 1999-2019, Mellanox Technologies, Inc. All rights reserved. + * Copyright (c) 2005-2006 Intel Corporation. All rights reserved. + */ + +#include <linux/completion.h> +#include <linux/in.h> +#include <linux/in6.h> +#include <linux/mutex.h> +#include <linux/random.h> +#include <linux/rbtree.h> +#include <linux/igmp.h> +#include <linux/xarray.h> +#include <linux/inetdevice.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <net/route.h> + +#include <net/net_namespace.h> +#include <net/netns/generic.h> +#include <net/netevent.h> +#include <net/tcp.h> +#include <net/ipv6.h> +#include <net/ip_fib.h> +#include <net/ip6_route.h> + +#include <rdma/rdma_cm.h> +#include <rdma/rdma_cm_ib.h> +#include <rdma/rdma_netlink.h> +#include <rdma/ib.h> +#include <rdma/ib_cache.h> +#include <rdma/ib_cm.h> +#include <rdma/ib_sa.h> +#include <rdma/iw_cm.h> + +#include "core_priv.h" +#include "cma_priv.h" +#include "cma_trace.h" + +MODULE_AUTHOR("Sean Hefty"); +MODULE_DESCRIPTION("Generic RDMA CM Agent"); +MODULE_LICENSE("Dual BSD/GPL"); + +#define CMA_CM_RESPONSE_TIMEOUT 20 +#define CMA_MAX_CM_RETRIES 15 +#define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24) +#define CMA_IBOE_PACKET_LIFETIME 18 +#define CMA_PREFERRED_ROCE_GID_TYPE IB_GID_TYPE_ROCE_UDP_ENCAP + +static const char * const cma_events[] = { + [RDMA_CM_EVENT_ADDR_RESOLVED] = "address resolved", + [RDMA_CM_EVENT_ADDR_ERROR] = "address error", + [RDMA_CM_EVENT_ROUTE_RESOLVED] = "route resolved ", + [RDMA_CM_EVENT_ROUTE_ERROR] = "route error", + [RDMA_CM_EVENT_CONNECT_REQUEST] = "connect request", + [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response", + [RDMA_CM_EVENT_CONNECT_ERROR] = "connect error", + [RDMA_CM_EVENT_UNREACHABLE] = "unreachable", + [RDMA_CM_EVENT_REJECTED] = "rejected", + [RDMA_CM_EVENT_ESTABLISHED] = "established", + [RDMA_CM_EVENT_DISCONNECTED] = "disconnected", + [RDMA_CM_EVENT_DEVICE_REMOVAL] = "device removal", + [RDMA_CM_EVENT_MULTICAST_JOIN] = "multicast join", + [RDMA_CM_EVENT_MULTICAST_ERROR] = "multicast error", + [RDMA_CM_EVENT_ADDR_CHANGE] = "address change", + [RDMA_CM_EVENT_TIMEWAIT_EXIT] = "timewait exit", +}; + +static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid, + enum ib_gid_type gid_type); + +const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event) +{ + size_t index = event; + + return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ? + cma_events[index] : "unrecognized event"; +} +EXPORT_SYMBOL(rdma_event_msg); + +const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id, + int reason) +{ + if (rdma_ib_or_roce(id->device, id->port_num)) + return ibcm_reject_msg(reason); + + if (rdma_protocol_iwarp(id->device, id->port_num)) + return iwcm_reject_msg(reason); + + WARN_ON_ONCE(1); + return "unrecognized transport"; +} +EXPORT_SYMBOL(rdma_reject_msg); + +/** + * rdma_is_consumer_reject - return true if the consumer rejected the connect + * request. + * @id: Communication identifier that received the REJECT event. + * @reason: Value returned in the REJECT event status field. + */ +static bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason) +{ + if (rdma_ib_or_roce(id->device, id->port_num)) + return reason == IB_CM_REJ_CONSUMER_DEFINED; + + if (rdma_protocol_iwarp(id->device, id->port_num)) + return reason == -ECONNREFUSED; + + WARN_ON_ONCE(1); + return false; +} + +const void *rdma_consumer_reject_data(struct rdma_cm_id *id, + struct rdma_cm_event *ev, u8 *data_len) +{ + const void *p; + + if (rdma_is_consumer_reject(id, ev->status)) { + *data_len = ev->param.conn.private_data_len; + p = ev->param.conn.private_data; + } else { + *data_len = 0; + p = NULL; + } + return p; +} +EXPORT_SYMBOL(rdma_consumer_reject_data); + +/** + * rdma_iw_cm_id() - return the iw_cm_id pointer for this cm_id. + * @id: Communication Identifier + */ +struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *id) +{ + struct rdma_id_private *id_priv; + + id_priv = container_of(id, struct rdma_id_private, id); + if (id->device->node_type == RDMA_NODE_RNIC) + return id_priv->cm_id.iw; + return NULL; +} +EXPORT_SYMBOL(rdma_iw_cm_id); + +/** + * rdma_res_to_id() - return the rdma_cm_id pointer for this restrack. + * @res: rdma resource tracking entry pointer + */ +struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res) +{ + struct rdma_id_private *id_priv = + container_of(res, struct rdma_id_private, res); + + return &id_priv->id; +} +EXPORT_SYMBOL(rdma_res_to_id); + +static int cma_add_one(struct ib_device *device); +static void cma_remove_one(struct ib_device *device, void *client_data); + +static struct ib_client cma_client = { + .name = "cma", + .add = cma_add_one, + .remove = cma_remove_one +}; + +static struct ib_sa_client sa_client; +static LIST_HEAD(dev_list); +static LIST_HEAD(listen_any_list); +static DEFINE_MUTEX(lock); +static struct rb_root id_table = RB_ROOT; +/* Serialize operations of id_table tree */ +static DEFINE_SPINLOCK(id_table_lock); +static struct workqueue_struct *cma_wq; +static unsigned int cma_pernet_id; + +struct cma_pernet { + struct xarray tcp_ps; + struct xarray udp_ps; + struct xarray ipoib_ps; + struct xarray ib_ps; +}; + +static struct cma_pernet *cma_pernet(struct net *net) +{ + return net_generic(net, cma_pernet_id); +} + +static +struct xarray *cma_pernet_xa(struct net *net, enum rdma_ucm_port_space ps) +{ + struct cma_pernet *pernet = cma_pernet(net); + + switch (ps) { + case RDMA_PS_TCP: + return &pernet->tcp_ps; + case RDMA_PS_UDP: + return &pernet->udp_ps; + case RDMA_PS_IPOIB: + return &pernet->ipoib_ps; + case RDMA_PS_IB: + return &pernet->ib_ps; + default: + return NULL; + } +} + +struct id_table_entry { + struct list_head id_list; + struct rb_node rb_node; +}; + +struct cma_device { + struct list_head list; + struct ib_device *device; + struct completion comp; + refcount_t refcount; + struct list_head id_list; + enum ib_gid_type *default_gid_type; + u8 *default_roce_tos; +}; + +struct rdma_bind_list { + enum rdma_ucm_port_space ps; + struct hlist_head owners; + unsigned short port; +}; + +static int cma_ps_alloc(struct net *net, enum rdma_ucm_port_space ps, + struct rdma_bind_list *bind_list, int snum) +{ + struct xarray *xa = cma_pernet_xa(net, ps); + + return xa_insert(xa, snum, bind_list, GFP_KERNEL); +} + +static struct rdma_bind_list *cma_ps_find(struct net *net, + enum rdma_ucm_port_space ps, int snum) +{ + struct xarray *xa = cma_pernet_xa(net, ps); + + return xa_load(xa, snum); +} + +static void cma_ps_remove(struct net *net, enum rdma_ucm_port_space ps, + int snum) +{ + struct xarray *xa = cma_pernet_xa(net, ps); + + xa_erase(xa, snum); +} + +enum { + CMA_OPTION_AFONLY, +}; + +void cma_dev_get(struct cma_device *cma_dev) +{ + refcount_inc(&cma_dev->refcount); +} + +void cma_dev_put(struct cma_device *cma_dev) +{ + if (refcount_dec_and_test(&cma_dev->refcount)) + complete(&cma_dev->comp); +} + +struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter filter, + void *cookie) +{ + struct cma_device *cma_dev; + struct cma_device *found_cma_dev = NULL; + + mutex_lock(&lock); + + list_for_each_entry(cma_dev, &dev_list, list) + if (filter(cma_dev->device, cookie)) { + found_cma_dev = cma_dev; + break; + } + + if (found_cma_dev) + cma_dev_get(found_cma_dev); + mutex_unlock(&lock); + return found_cma_dev; +} + +int cma_get_default_gid_type(struct cma_device *cma_dev, + u32 port) +{ + if (!rdma_is_port_valid(cma_dev->device, port)) + return -EINVAL; + + return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)]; +} + +int cma_set_default_gid_type(struct cma_device *cma_dev, + u32 port, + enum ib_gid_type default_gid_type) +{ + unsigned long supported_gids; + + if (!rdma_is_port_valid(cma_dev->device, port)) + return -EINVAL; + + if (default_gid_type == IB_GID_TYPE_IB && + rdma_protocol_roce_eth_encap(cma_dev->device, port)) + default_gid_type = IB_GID_TYPE_ROCE; + + supported_gids = roce_gid_type_mask_support(cma_dev->device, port); + + if (!(supported_gids & 1 << default_gid_type)) + return -EINVAL; + + cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] = + default_gid_type; + + return 0; +} + +int cma_get_default_roce_tos(struct cma_device *cma_dev, u32 port) +{ + if (!rdma_is_port_valid(cma_dev->device, port)) + return -EINVAL; + + return cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)]; +} + +int cma_set_default_roce_tos(struct cma_device *cma_dev, u32 port, + u8 default_roce_tos) +{ + if (!rdma_is_port_valid(cma_dev->device, port)) + return -EINVAL; + + cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)] = + default_roce_tos; + + return 0; +} +struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev) +{ + return cma_dev->device; +} + +/* + * Device removal can occur at anytime, so we need extra handling to + * serialize notifying the user of device removal with other callbacks. + * We do this by disabling removal notification while a callback is in process, + * and reporting it after the callback completes. + */ + +struct cma_multicast { + struct rdma_id_private *id_priv; + union { + struct ib_sa_multicast *sa_mc; + struct { + struct work_struct work; + struct rdma_cm_event event; + } iboe_join; + }; + struct list_head list; + void *context; + struct sockaddr_storage addr; + u8 join_state; +}; + +struct cma_work { + struct work_struct work; + struct rdma_id_private *id; + enum rdma_cm_state old_state; + enum rdma_cm_state new_state; + struct rdma_cm_event event; +}; + +union cma_ip_addr { + struct in6_addr ip6; + struct { + __be32 pad[3]; + __be32 addr; + } ip4; +}; + +struct cma_hdr { + u8 cma_version; + u8 ip_version; /* IP version: 7:4 */ + __be16 port; + union cma_ip_addr src_addr; + union cma_ip_addr dst_addr; +}; + +#define CMA_VERSION 0x00 + +struct cma_req_info { + struct sockaddr_storage listen_addr_storage; + struct sockaddr_storage src_addr_storage; + struct ib_device *device; + union ib_gid local_gid; + __be64 service_id; + int port; + bool has_gid; + u16 pkey; +}; + +static int cma_comp_exch(struct rdma_id_private *id_priv, + enum rdma_cm_state comp, enum rdma_cm_state exch) +{ + unsigned long flags; + int ret; + + /* + * The FSM uses a funny double locking where state is protected by both + * the handler_mutex and the spinlock. State is not allowed to change + * to/from a handler_mutex protected value without also holding + * handler_mutex. + */ + if (comp == RDMA_CM_CONNECT || exch == RDMA_CM_CONNECT) + lockdep_assert_held(&id_priv->handler_mutex); + + spin_lock_irqsave(&id_priv->lock, flags); + if ((ret = (id_priv->state == comp))) + id_priv->state = exch; + spin_unlock_irqrestore(&id_priv->lock, flags); + return ret; +} + +static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr) +{ + return hdr->ip_version >> 4; +} + +static void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver) +{ + hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF); +} + +static struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv) +{ + return (struct sockaddr *)&id_priv->id.route.addr.src_addr; +} + +static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv) +{ + return (struct sockaddr *)&id_priv->id.route.addr.dst_addr; +} + +static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join) +{ + struct in_device *in_dev = NULL; + + if (ndev) { + rtnl_lock(); + in_dev = __in_dev_get_rtnl(ndev); + if (in_dev) { + if (join) + ip_mc_inc_group(in_dev, + *(__be32 *)(mgid->raw + 12)); + else + ip_mc_dec_group(in_dev, + *(__be32 *)(mgid->raw + 12)); + } + rtnl_unlock(); + } + return (in_dev) ? 0 : -ENODEV; +} + +static int compare_netdev_and_ip(int ifindex_a, struct sockaddr *sa, + struct id_table_entry *entry_b) +{ + struct rdma_id_private *id_priv = list_first_entry( + &entry_b->id_list, struct rdma_id_private, id_list_entry); + int ifindex_b = id_priv->id.route.addr.dev_addr.bound_dev_if; + struct sockaddr *sb = cma_dst_addr(id_priv); + + if (ifindex_a != ifindex_b) + return (ifindex_a > ifindex_b) ? 1 : -1; + + if (sa->sa_family != sb->sa_family) + return sa->sa_family - sb->sa_family; + + if (sa->sa_family == AF_INET && + __builtin_object_size(sa, 0) >= sizeof(struct sockaddr_in)) { + return memcmp(&((struct sockaddr_in *)sa)->sin_addr, + &((struct sockaddr_in *)sb)->sin_addr, + sizeof(((struct sockaddr_in *)sa)->sin_addr)); + } + + if (sa->sa_family == AF_INET6 && + __builtin_object_size(sa, 0) >= sizeof(struct sockaddr_in6)) { + return ipv6_addr_cmp(&((struct sockaddr_in6 *)sa)->sin6_addr, + &((struct sockaddr_in6 *)sb)->sin6_addr); + } + + return -1; +} + +static int cma_add_id_to_tree(struct rdma_id_private *node_id_priv) +{ + struct rb_node **new, *parent = NULL; + struct id_table_entry *this, *node; + unsigned long flags; + int result; + + node = kzalloc(sizeof(*node), GFP_KERNEL); + if (!node) + return -ENOMEM; + + spin_lock_irqsave(&id_table_lock, flags); + new = &id_table.rb_node; + while (*new) { + this = container_of(*new, struct id_table_entry, rb_node); + result = compare_netdev_and_ip( + node_id_priv->id.route.addr.dev_addr.bound_dev_if, + cma_dst_addr(node_id_priv), this); + + parent = *new; + if (result < 0) + new = &((*new)->rb_left); + else if (result > 0) + new = &((*new)->rb_right); + else { + list_add_tail(&node_id_priv->id_list_entry, + &this->id_list); + kfree(node); + goto unlock; + } + } + + INIT_LIST_HEAD(&node->id_list); + list_add_tail(&node_id_priv->id_list_entry, &node->id_list); + + rb_link_node(&node->rb_node, parent, new); + rb_insert_color(&node->rb_node, &id_table); + +unlock: + spin_unlock_irqrestore(&id_table_lock, flags); + return 0; +} + +static struct id_table_entry * +node_from_ndev_ip(struct rb_root *root, int ifindex, struct sockaddr *sa) +{ + struct rb_node *node = root->rb_node; + struct id_table_entry *data; + int result; + + while (node) { + data = container_of(node, struct id_table_entry, rb_node); + result = compare_netdev_and_ip(ifindex, sa, data); + if (result < 0) + node = node->rb_left; + else if (result > 0) + node = node->rb_right; + else + return data; + } + + return NULL; +} + +static void cma_remove_id_from_tree(struct rdma_id_private *id_priv) +{ + struct id_table_entry *data; + unsigned long flags; + + spin_lock_irqsave(&id_table_lock, flags); + if (list_empty(&id_priv->id_list_entry)) + goto out; + + data = node_from_ndev_ip(&id_table, + id_priv->id.route.addr.dev_addr.bound_dev_if, + cma_dst_addr(id_priv)); + if (!data) + goto out; + + list_del_init(&id_priv->id_list_entry); + if (list_empty(&data->id_list)) { + rb_erase(&data->rb_node, &id_table); + kfree(data); + } +out: + spin_unlock_irqrestore(&id_table_lock, flags); +} + +static void _cma_attach_to_dev(struct rdma_id_private *id_priv, + struct cma_device *cma_dev) +{ + cma_dev_get(cma_dev); + id_priv->cma_dev = cma_dev; + id_priv->id.device = cma_dev->device; + id_priv->id.route.addr.dev_addr.transport = + rdma_node_get_transport(cma_dev->device->node_type); + list_add_tail(&id_priv->device_item, &cma_dev->id_list); + + trace_cm_id_attach(id_priv, cma_dev->device); +} + +static void cma_attach_to_dev(struct rdma_id_private *id_priv, + struct cma_device *cma_dev) +{ + _cma_attach_to_dev(id_priv, cma_dev); + id_priv->gid_type = + cma_dev->default_gid_type[id_priv->id.port_num - + rdma_start_port(cma_dev->device)]; +} + +static void cma_release_dev(struct rdma_id_private *id_priv) +{ + mutex_lock(&lock); + list_del_init(&id_priv->device_item); + cma_dev_put(id_priv->cma_dev); + id_priv->cma_dev = NULL; + id_priv->id.device = NULL; + if (id_priv->id.route.addr.dev_addr.sgid_attr) { + rdma_put_gid_attr(id_priv->id.route.addr.dev_addr.sgid_attr); + id_priv->id.route.addr.dev_addr.sgid_attr = NULL; + } + mutex_unlock(&lock); +} + +static inline unsigned short cma_family(struct rdma_id_private *id_priv) +{ + return id_priv->id.route.addr.src_addr.ss_family; +} + +static int cma_set_default_qkey(struct rdma_id_private *id_priv) +{ + struct ib_sa_mcmember_rec rec; + int ret = 0; + + switch (id_priv->id.ps) { + case RDMA_PS_UDP: + case RDMA_PS_IB: + id_priv->qkey = RDMA_UDP_QKEY; + break; + case RDMA_PS_IPOIB: + ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid); + ret = ib_sa_get_mcmember_rec(id_priv->id.device, + id_priv->id.port_num, &rec.mgid, + &rec); + if (!ret) + id_priv->qkey = be32_to_cpu(rec.qkey); + break; + default: + break; + } + return ret; +} + +static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey) +{ + if (!qkey || + (id_priv->qkey && (id_priv->qkey != qkey))) + return -EINVAL; + + id_priv->qkey = qkey; + return 0; +} + +static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr) +{ + dev_addr->dev_type = ARPHRD_INFINIBAND; + rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr); + ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey)); +} + +static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr) +{ + int ret; + + if (addr->sa_family != AF_IB) { + ret = rdma_translate_ip(addr, dev_addr); + } else { + cma_translate_ib((struct sockaddr_ib *) addr, dev_addr); + ret = 0; + } + + return ret; +} + +static const struct ib_gid_attr * +cma_validate_port(struct ib_device *device, u32 port, + enum ib_gid_type gid_type, + union ib_gid *gid, + struct rdma_id_private *id_priv) +{ + struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; + int bound_if_index = dev_addr->bound_dev_if; + const struct ib_gid_attr *sgid_attr; + int dev_type = dev_addr->dev_type; + struct net_device *ndev = NULL; + + if (!rdma_dev_access_netns(device, id_priv->id.route.addr.dev_addr.net)) + return ERR_PTR(-ENODEV); + + if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port)) + return ERR_PTR(-ENODEV); + + if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port)) + return ERR_PTR(-ENODEV); + + if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) { + ndev = dev_get_by_index(dev_addr->net, bound_if_index); + if (!ndev) + return ERR_PTR(-ENODEV); + } else { + gid_type = IB_GID_TYPE_IB; + } + + sgid_attr = rdma_find_gid_by_port(device, gid, gid_type, port, ndev); + if (ndev) + dev_put(ndev); + return sgid_attr; +} + +static void cma_bind_sgid_attr(struct rdma_id_private *id_priv, + const struct ib_gid_attr *sgid_attr) +{ + WARN_ON(id_priv->id.route.addr.dev_addr.sgid_attr); + id_priv->id.route.addr.dev_addr.sgid_attr = sgid_attr; +} + +/** + * cma_acquire_dev_by_src_ip - Acquire cma device, port, gid attribute + * based on source ip address. + * @id_priv: cm_id which should be bound to cma device + * + * cma_acquire_dev_by_src_ip() binds cm id to cma device, port and GID attribute + * based on source IP address. It returns 0 on success or error code otherwise. + * It is applicable to active and passive side cm_id. + */ +static int cma_acquire_dev_by_src_ip(struct rdma_id_private *id_priv) +{ + struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; + const struct ib_gid_attr *sgid_attr; + union ib_gid gid, iboe_gid, *gidp; + struct cma_device *cma_dev; + enum ib_gid_type gid_type; + int ret = -ENODEV; + u32 port; + + if (dev_addr->dev_type != ARPHRD_INFINIBAND && + id_priv->id.ps == RDMA_PS_IPOIB) + return -EINVAL; + + rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr, + &iboe_gid); + + memcpy(&gid, dev_addr->src_dev_addr + + rdma_addr_gid_offset(dev_addr), sizeof(gid)); + + mutex_lock(&lock); + list_for_each_entry(cma_dev, &dev_list, list) { + rdma_for_each_port (cma_dev->device, port) { + gidp = rdma_protocol_roce(cma_dev->device, port) ? + &iboe_gid : &gid; + gid_type = cma_dev->default_gid_type[port - 1]; + sgid_attr = cma_validate_port(cma_dev->device, port, + gid_type, gidp, id_priv); + if (!IS_ERR(sgid_attr)) { + id_priv->id.port_num = port; + cma_bind_sgid_attr(id_priv, sgid_attr); + cma_attach_to_dev(id_priv, cma_dev); + ret = 0; + goto out; + } + } + } +out: + mutex_unlock(&lock); + return ret; +} + +/** + * cma_ib_acquire_dev - Acquire cma device, port and SGID attribute + * @id_priv: cm id to bind to cma device + * @listen_id_priv: listener cm id to match against + * @req: Pointer to req structure containaining incoming + * request information + * cma_ib_acquire_dev() acquires cma device, port and SGID attribute when + * rdma device matches for listen_id and incoming request. It also verifies + * that a GID table entry is present for the source address. + * Returns 0 on success, or returns error code otherwise. + */ +static int cma_ib_acquire_dev(struct rdma_id_private *id_priv, + const struct rdma_id_private *listen_id_priv, + struct cma_req_info *req) +{ + struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; + const struct ib_gid_attr *sgid_attr; + enum ib_gid_type gid_type; + union ib_gid gid; + + if (dev_addr->dev_type != ARPHRD_INFINIBAND && + id_priv->id.ps == RDMA_PS_IPOIB) + return -EINVAL; + + if (rdma_protocol_roce(req->device, req->port)) + rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr, + &gid); + else + memcpy(&gid, dev_addr->src_dev_addr + + rdma_addr_gid_offset(dev_addr), sizeof(gid)); + + gid_type = listen_id_priv->cma_dev->default_gid_type[req->port - 1]; + sgid_attr = cma_validate_port(req->device, req->port, + gid_type, &gid, id_priv); + if (IS_ERR(sgid_attr)) + return PTR_ERR(sgid_attr); + + id_priv->id.port_num = req->port; + cma_bind_sgid_attr(id_priv, sgid_attr); + /* Need to acquire lock to protect against reader + * of cma_dev->id_list such as cma_netdev_callback() and + * cma_process_remove(). + */ + mutex_lock(&lock); + cma_attach_to_dev(id_priv, listen_id_priv->cma_dev); + mutex_unlock(&lock); + rdma_restrack_add(&id_priv->res); + return 0; +} + +static int cma_iw_acquire_dev(struct rdma_id_private *id_priv, + const struct rdma_id_private *listen_id_priv) +{ + struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; + const struct ib_gid_attr *sgid_attr; + struct cma_device *cma_dev; + enum ib_gid_type gid_type; + int ret = -ENODEV; + union ib_gid gid; + u32 port; + + if (dev_addr->dev_type != ARPHRD_INFINIBAND && + id_priv->id.ps == RDMA_PS_IPOIB) + return -EINVAL; + + memcpy(&gid, dev_addr->src_dev_addr + + rdma_addr_gid_offset(dev_addr), sizeof(gid)); + + mutex_lock(&lock); + + cma_dev = listen_id_priv->cma_dev; + port = listen_id_priv->id.port_num; + gid_type = listen_id_priv->gid_type; + sgid_attr = cma_validate_port(cma_dev->device, port, + gid_type, &gid, id_priv); + if (!IS_ERR(sgid_attr)) { + id_priv->id.port_num = port; + cma_bind_sgid_attr(id_priv, sgid_attr); + ret = 0; + goto out; + } + + list_for_each_entry(cma_dev, &dev_list, list) { + rdma_for_each_port (cma_dev->device, port) { + if (listen_id_priv->cma_dev == cma_dev && + listen_id_priv->id.port_num == port) + continue; + + gid_type = cma_dev->default_gid_type[port - 1]; + sgid_attr = cma_validate_port(cma_dev->device, port, + gid_type, &gid, id_priv); + if (!IS_ERR(sgid_attr)) { + id_priv->id.port_num = port; + cma_bind_sgid_attr(id_priv, sgid_attr); + ret = 0; + goto out; + } + } + } + +out: + if (!ret) { + cma_attach_to_dev(id_priv, cma_dev); + rdma_restrack_add(&id_priv->res); + } + + mutex_unlock(&lock); + return ret; +} + +/* + * Select the source IB device and address to reach the destination IB address. + */ +static int cma_resolve_ib_dev(struct rdma_id_private *id_priv) +{ + struct cma_device *cma_dev, *cur_dev; + struct sockaddr_ib *addr; + union ib_gid gid, sgid, *dgid; + unsigned int p; + u16 pkey, index; + enum ib_port_state port_state; + int ret; + int i; + + cma_dev = NULL; + addr = (struct sockaddr_ib *) cma_dst_addr(id_priv); + dgid = (union ib_gid *) &addr->sib_addr; + pkey = ntohs(addr->sib_pkey); + + mutex_lock(&lock); + list_for_each_entry(cur_dev, &dev_list, list) { + rdma_for_each_port (cur_dev->device, p) { + if (!rdma_cap_af_ib(cur_dev->device, p)) + continue; + + if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index)) + continue; + + if (ib_get_cached_port_state(cur_dev->device, p, &port_state)) + continue; + + for (i = 0; i < cur_dev->device->port_data[p].immutable.gid_tbl_len; + ++i) { + ret = rdma_query_gid(cur_dev->device, p, i, + &gid); + if (ret) + continue; + + if (!memcmp(&gid, dgid, sizeof(gid))) { + cma_dev = cur_dev; + sgid = gid; + id_priv->id.port_num = p; + goto found; + } + + if (!cma_dev && (gid.global.subnet_prefix == + dgid->global.subnet_prefix) && + port_state == IB_PORT_ACTIVE) { + cma_dev = cur_dev; + sgid = gid; + id_priv->id.port_num = p; + goto found; + } + } + } + } + mutex_unlock(&lock); + return -ENODEV; + +found: + cma_attach_to_dev(id_priv, cma_dev); + rdma_restrack_add(&id_priv->res); + mutex_unlock(&lock); + addr = (struct sockaddr_ib *)cma_src_addr(id_priv); + memcpy(&addr->sib_addr, &sgid, sizeof(sgid)); + cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr); + return 0; +} + +static void cma_id_get(struct rdma_id_private *id_priv) +{ + refcount_inc(&id_priv->refcount); +} + +static void cma_id_put(struct rdma_id_private *id_priv) +{ + if (refcount_dec_and_test(&id_priv->refcount)) + complete(&id_priv->comp); +} + +static struct rdma_id_private * +__rdma_create_id(struct net *net, rdma_cm_event_handler event_handler, + void *context, enum rdma_ucm_port_space ps, + enum ib_qp_type qp_type, const struct rdma_id_private *parent) +{ + struct rdma_id_private *id_priv; + + id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL); + if (!id_priv) + return ERR_PTR(-ENOMEM); + + id_priv->state = RDMA_CM_IDLE; + id_priv->id.context = context; + id_priv->id.event_handler = event_handler; + id_priv->id.ps = ps; + id_priv->id.qp_type = qp_type; + id_priv->tos_set = false; + id_priv->timeout_set = false; + id_priv->min_rnr_timer_set = false; + id_priv->gid_type = IB_GID_TYPE_IB; + spin_lock_init(&id_priv->lock); + mutex_init(&id_priv->qp_mutex); + init_completion(&id_priv->comp); + refcount_set(&id_priv->refcount, 1); + mutex_init(&id_priv->handler_mutex); + INIT_LIST_HEAD(&id_priv->device_item); + INIT_LIST_HEAD(&id_priv->id_list_entry); + INIT_LIST_HEAD(&id_priv->listen_list); + INIT_LIST_HEAD(&id_priv->mc_list); + get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num); + id_priv->id.route.addr.dev_addr.net = get_net(net); + id_priv->seq_num &= 0x00ffffff; + + rdma_restrack_new(&id_priv->res, RDMA_RESTRACK_CM_ID); + if (parent) + rdma_restrack_parent_name(&id_priv->res, &parent->res); + + return id_priv; +} + +struct rdma_cm_id * +__rdma_create_kernel_id(struct net *net, rdma_cm_event_handler event_handler, + void *context, enum rdma_ucm_port_space ps, + enum ib_qp_type qp_type, const char *caller) +{ + struct rdma_id_private *ret; + + ret = __rdma_create_id(net, event_handler, context, ps, qp_type, NULL); + if (IS_ERR(ret)) + return ERR_CAST(ret); + + rdma_restrack_set_name(&ret->res, caller); + return &ret->id; +} +EXPORT_SYMBOL(__rdma_create_kernel_id); + +struct rdma_cm_id *rdma_create_user_id(rdma_cm_event_handler event_handler, + void *context, + enum rdma_ucm_port_space ps, + enum ib_qp_type qp_type) +{ + struct rdma_id_private *ret; + + ret = __rdma_create_id(current->nsproxy->net_ns, event_handler, context, + ps, qp_type, NULL); + if (IS_ERR(ret)) + return ERR_CAST(ret); + + rdma_restrack_set_name(&ret->res, NULL); + return &ret->id; +} +EXPORT_SYMBOL(rdma_create_user_id); + +static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp) +{ + struct ib_qp_attr qp_attr; + int qp_attr_mask, ret; + + qp_attr.qp_state = IB_QPS_INIT; + ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); + if (ret) + return ret; + + ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); + if (ret) + return ret; + + qp_attr.qp_state = IB_QPS_RTR; + ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE); + if (ret) + return ret; + + qp_attr.qp_state = IB_QPS_RTS; + qp_attr.sq_psn = 0; + ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN); + + return ret; +} + +static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp) +{ + struct ib_qp_attr qp_attr; + int qp_attr_mask, ret; + + qp_attr.qp_state = IB_QPS_INIT; + ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); + if (ret) + return ret; + + return ib_modify_qp(qp, &qp_attr, qp_attr_mask); +} + +int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd, + struct ib_qp_init_attr *qp_init_attr) +{ + struct rdma_id_private *id_priv; + struct ib_qp *qp; + int ret; + + id_priv = container_of(id, struct rdma_id_private, id); + if (id->device != pd->device) { + ret = -EINVAL; + goto out_err; + } + + qp_init_attr->port_num = id->port_num; + qp = ib_create_qp(pd, qp_init_attr); + if (IS_ERR(qp)) { + ret = PTR_ERR(qp); + goto out_err; + } + + if (id->qp_type == IB_QPT_UD) + ret = cma_init_ud_qp(id_priv, qp); + else + ret = cma_init_conn_qp(id_priv, qp); + if (ret) + goto out_destroy; + + id->qp = qp; + id_priv->qp_num = qp->qp_num; + id_priv->srq = (qp->srq != NULL); + trace_cm_qp_create(id_priv, pd, qp_init_attr, 0); + return 0; +out_destroy: + ib_destroy_qp(qp); +out_err: + trace_cm_qp_create(id_priv, pd, qp_init_attr, ret); + return ret; +} +EXPORT_SYMBOL(rdma_create_qp); + +void rdma_destroy_qp(struct rdma_cm_id *id) +{ + struct rdma_id_private *id_priv; + + id_priv = container_of(id, struct rdma_id_private, id); + trace_cm_qp_destroy(id_priv); + mutex_lock(&id_priv->qp_mutex); + ib_destroy_qp(id_priv->id.qp); + id_priv->id.qp = NULL; + mutex_unlock(&id_priv->qp_mutex); +} +EXPORT_SYMBOL(rdma_destroy_qp); + +static int cma_modify_qp_rtr(struct rdma_id_private *id_priv, + struct rdma_conn_param *conn_param) +{ + struct ib_qp_attr qp_attr; + int qp_attr_mask, ret; + + mutex_lock(&id_priv->qp_mutex); + if (!id_priv->id.qp) { + ret = 0; + goto out; + } + + /* Need to update QP attributes from default values. */ + qp_attr.qp_state = IB_QPS_INIT; + ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); + if (ret) + goto out; + + ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask); + if (ret) + goto out; + + qp_attr.qp_state = IB_QPS_RTR; + ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); + if (ret) + goto out; + + BUG_ON(id_priv->cma_dev->device != id_priv->id.device); + + if (conn_param) + qp_attr.max_dest_rd_atomic = conn_param->responder_resources; + ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask); +out: + mutex_unlock(&id_priv->qp_mutex); + return ret; +} + +static int cma_modify_qp_rts(struct rdma_id_private *id_priv, + struct rdma_conn_param *conn_param) +{ + struct ib_qp_attr qp_attr; + int qp_attr_mask, ret; + + mutex_lock(&id_priv->qp_mutex); + if (!id_priv->id.qp) { + ret = 0; + goto out; + } + + qp_attr.qp_state = IB_QPS_RTS; + ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); + if (ret) + goto out; + + if (conn_param) + qp_attr.max_rd_atomic = conn_param->initiator_depth; + ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask); +out: + mutex_unlock(&id_priv->qp_mutex); + return ret; +} + +static int cma_modify_qp_err(struct rdma_id_private *id_priv) +{ + struct ib_qp_attr qp_attr; + int ret; + + mutex_lock(&id_priv->qp_mutex); + if (!id_priv->id.qp) { + ret = 0; + goto out; + } + + qp_attr.qp_state = IB_QPS_ERR; + ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE); +out: + mutex_unlock(&id_priv->qp_mutex); + return ret; +} + +static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv, + struct ib_qp_attr *qp_attr, int *qp_attr_mask) +{ + struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; + int ret; + u16 pkey; + + if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num)) + pkey = 0xffff; + else + pkey = ib_addr_get_pkey(dev_addr); + + ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num, + pkey, &qp_attr->pkey_index); + if (ret) + return ret; + + qp_attr->port_num = id_priv->id.port_num; + *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT; + + if (id_priv->id.qp_type == IB_QPT_UD) { + ret = cma_set_default_qkey(id_priv); + if (ret) + return ret; + + qp_attr->qkey = id_priv->qkey; + *qp_attr_mask |= IB_QP_QKEY; + } else { + qp_attr->qp_access_flags = 0; + *qp_attr_mask |= IB_QP_ACCESS_FLAGS; + } + return 0; +} + +int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr, + int *qp_attr_mask) +{ + struct rdma_id_private *id_priv; + int ret = 0; + + id_priv = container_of(id, struct rdma_id_private, id); + if (rdma_cap_ib_cm(id->device, id->port_num)) { + if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD)) + ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask); + else + ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr, + qp_attr_mask); + + if (qp_attr->qp_state == IB_QPS_RTR) + qp_attr->rq_psn = id_priv->seq_num; + } else if (rdma_cap_iw_cm(id->device, id->port_num)) { + if (!id_priv->cm_id.iw) { + qp_attr->qp_access_flags = 0; + *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS; + } else + ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr, + qp_attr_mask); + qp_attr->port_num = id_priv->id.port_num; + *qp_attr_mask |= IB_QP_PORT; + } else { + ret = -ENOSYS; + } + + if ((*qp_attr_mask & IB_QP_TIMEOUT) && id_priv->timeout_set) + qp_attr->timeout = id_priv->timeout; + + if ((*qp_attr_mask & IB_QP_MIN_RNR_TIMER) && id_priv->min_rnr_timer_set) + qp_attr->min_rnr_timer = id_priv->min_rnr_timer; + + return ret; +} +EXPORT_SYMBOL(rdma_init_qp_attr); + +static inline bool cma_zero_addr(const struct sockaddr *addr) +{ + switch (addr->sa_family) { + case AF_INET: + return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr); + case AF_INET6: + return ipv6_addr_any(&((struct sockaddr_in6 *)addr)->sin6_addr); + case AF_IB: + return ib_addr_any(&((struct sockaddr_ib *)addr)->sib_addr); + default: + return false; + } +} + +static inline bool cma_loopback_addr(const struct sockaddr *addr) +{ + switch (addr->sa_family) { + case AF_INET: + return ipv4_is_loopback( + ((struct sockaddr_in *)addr)->sin_addr.s_addr); + case AF_INET6: + return ipv6_addr_loopback( + &((struct sockaddr_in6 *)addr)->sin6_addr); + case AF_IB: + return ib_addr_loopback( + &((struct sockaddr_ib *)addr)->sib_addr); + default: + return false; + } +} + +static inline bool cma_any_addr(const struct sockaddr *addr) +{ + return cma_zero_addr(addr) || cma_loopback_addr(addr); +} + +static int cma_addr_cmp(const struct sockaddr *src, const struct sockaddr *dst) +{ + if (src->sa_family != dst->sa_family) + return -1; + + switch (src->sa_family) { + case AF_INET: + return ((struct sockaddr_in *)src)->sin_addr.s_addr != + ((struct sockaddr_in *)dst)->sin_addr.s_addr; + case AF_INET6: { + struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *)src; + struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *)dst; + bool link_local; + + if (ipv6_addr_cmp(&src_addr6->sin6_addr, + &dst_addr6->sin6_addr)) + return 1; + link_local = ipv6_addr_type(&dst_addr6->sin6_addr) & + IPV6_ADDR_LINKLOCAL; + /* Link local must match their scope_ids */ + return link_local ? (src_addr6->sin6_scope_id != + dst_addr6->sin6_scope_id) : + 0; + } + + default: + return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr, + &((struct sockaddr_ib *) dst)->sib_addr); + } +} + +static __be16 cma_port(const struct sockaddr *addr) +{ + struct sockaddr_ib *sib; + + switch (addr->sa_family) { + case AF_INET: + return ((struct sockaddr_in *) addr)->sin_port; + case AF_INET6: + return ((struct sockaddr_in6 *) addr)->sin6_port; + case AF_IB: + sib = (struct sockaddr_ib *) addr; + return htons((u16) (be64_to_cpu(sib->sib_sid) & + be64_to_cpu(sib->sib_sid_mask))); + default: + return 0; + } +} + +static inline int cma_any_port(const struct sockaddr *addr) +{ + return !cma_port(addr); +} + +static void cma_save_ib_info(struct sockaddr *src_addr, + struct sockaddr *dst_addr, + const struct rdma_cm_id *listen_id, + const struct sa_path_rec *path) +{ + struct sockaddr_ib *listen_ib, *ib; + + listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr; + if (src_addr) { + ib = (struct sockaddr_ib *)src_addr; + ib->sib_family = AF_IB; + if (path) { + ib->sib_pkey = path->pkey; + ib->sib_flowinfo = path->flow_label; + memcpy(&ib->sib_addr, &path->sgid, 16); + ib->sib_sid = path->service_id; + ib->sib_scope_id = 0; + } else { + ib->sib_pkey = listen_ib->sib_pkey; + ib->sib_flowinfo = listen_ib->sib_flowinfo; + ib->sib_addr = listen_ib->sib_addr; + ib->sib_sid = listen_ib->sib_sid; + ib->sib_scope_id = listen_ib->sib_scope_id; + } + ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL); + } + if (dst_addr) { + ib = (struct sockaddr_ib *)dst_addr; + ib->sib_family = AF_IB; + if (path) { + ib->sib_pkey = path->pkey; + ib->sib_flowinfo = path->flow_label; + memcpy(&ib->sib_addr, &path->dgid, 16); + } + } +} + +static void cma_save_ip4_info(struct sockaddr_in *src_addr, + struct sockaddr_in *dst_addr, + struct cma_hdr *hdr, + __be16 local_port) +{ + if (src_addr) { + *src_addr = (struct sockaddr_in) { + .sin_family = AF_INET, + .sin_addr.s_addr = hdr->dst_addr.ip4.addr, + .sin_port = local_port, + }; + } + + if (dst_addr) { + *dst_addr = (struct sockaddr_in) { + .sin_family = AF_INET, + .sin_addr.s_addr = hdr->src_addr.ip4.addr, + .sin_port = hdr->port, + }; + } +} + +static void cma_save_ip6_info(struct sockaddr_in6 *src_addr, + struct sockaddr_in6 *dst_addr, + struct cma_hdr *hdr, + __be16 local_port) +{ + if (src_addr) { + *src_addr = (struct sockaddr_in6) { + .sin6_family = AF_INET6, + .sin6_addr = hdr->dst_addr.ip6, + .sin6_port = local_port, + }; + } + + if (dst_addr) { + *dst_addr = (struct sockaddr_in6) { + .sin6_family = AF_INET6, + .sin6_addr = hdr->src_addr.ip6, + .sin6_port = hdr->port, + }; + } +} + +static u16 cma_port_from_service_id(__be64 service_id) +{ + return (u16)be64_to_cpu(service_id); +} + +static int cma_save_ip_info(struct sockaddr *src_addr, + struct sockaddr *dst_addr, + const struct ib_cm_event *ib_event, + __be64 service_id) +{ + struct cma_hdr *hdr; + __be16 port; + + hdr = ib_event->private_data; + if (hdr->cma_version != CMA_VERSION) + return -EINVAL; + + port = htons(cma_port_from_service_id(service_id)); + + switch (cma_get_ip_ver(hdr)) { + case 4: + cma_save_ip4_info((struct sockaddr_in *)src_addr, + (struct sockaddr_in *)dst_addr, hdr, port); + break; + case 6: + cma_save_ip6_info((struct sockaddr_in6 *)src_addr, + (struct sockaddr_in6 *)dst_addr, hdr, port); + break; + default: + return -EAFNOSUPPORT; + } + + return 0; +} + +static int cma_save_net_info(struct sockaddr *src_addr, + struct sockaddr *dst_addr, + const struct rdma_cm_id *listen_id, + const struct ib_cm_event *ib_event, + sa_family_t sa_family, __be64 service_id) +{ + if (sa_family == AF_IB) { + if (ib_event->event == IB_CM_REQ_RECEIVED) + cma_save_ib_info(src_addr, dst_addr, listen_id, + ib_event->param.req_rcvd.primary_path); + else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) + cma_save_ib_info(src_addr, dst_addr, listen_id, NULL); + return 0; + } + + return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id); +} + +static int cma_save_req_info(const struct ib_cm_event *ib_event, + struct cma_req_info *req) +{ + const struct ib_cm_req_event_param *req_param = + &ib_event->param.req_rcvd; + const struct ib_cm_sidr_req_event_param *sidr_param = + &ib_event->param.sidr_req_rcvd; + + switch (ib_event->event) { + case IB_CM_REQ_RECEIVED: + req->device = req_param->listen_id->device; + req->port = req_param->port; + memcpy(&req->local_gid, &req_param->primary_path->sgid, + sizeof(req->local_gid)); + req->has_gid = true; + req->service_id = req_param->primary_path->service_id; + req->pkey = be16_to_cpu(req_param->primary_path->pkey); + if (req->pkey != req_param->bth_pkey) + pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n" + "RDMA CMA: in the future this may cause the request to be dropped\n", + req_param->bth_pkey, req->pkey); + break; + case IB_CM_SIDR_REQ_RECEIVED: + req->device = sidr_param->listen_id->device; + req->port = sidr_param->port; + req->has_gid = false; + req->service_id = sidr_param->service_id; + req->pkey = sidr_param->pkey; + if (req->pkey != sidr_param->bth_pkey) + pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n" + "RDMA CMA: in the future this may cause the request to be dropped\n", + sidr_param->bth_pkey, req->pkey); + break; + default: + return -EINVAL; + } + + return 0; +} + +static bool validate_ipv4_net_dev(struct net_device *net_dev, + const struct sockaddr_in *dst_addr, + const struct sockaddr_in *src_addr) +{ + __be32 daddr = dst_addr->sin_addr.s_addr, + saddr = src_addr->sin_addr.s_addr; + struct fib_result res; + struct flowi4 fl4; + int err; + bool ret; + + if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || + ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) || + ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) || + ipv4_is_loopback(saddr)) + return false; + + memset(&fl4, 0, sizeof(fl4)); + fl4.flowi4_oif = net_dev->ifindex; + fl4.daddr = daddr; + fl4.saddr = saddr; + + rcu_read_lock(); + err = fib_lookup(dev_net(net_dev), &fl4, &res, 0); + ret = err == 0 && FIB_RES_DEV(res) == net_dev; + rcu_read_unlock(); + + return ret; +} + +static bool validate_ipv6_net_dev(struct net_device *net_dev, + const struct sockaddr_in6 *dst_addr, + const struct sockaddr_in6 *src_addr) +{ +#if IS_ENABLED(CONFIG_IPV6) + const int strict = ipv6_addr_type(&dst_addr->sin6_addr) & + IPV6_ADDR_LINKLOCAL; + struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr, + &src_addr->sin6_addr, net_dev->ifindex, + NULL, strict); + bool ret; + + if (!rt) + return false; + + ret = rt->rt6i_idev->dev == net_dev; + ip6_rt_put(rt); + + return ret; +#else + return false; +#endif +} + +static bool validate_net_dev(struct net_device *net_dev, + const struct sockaddr *daddr, + const struct sockaddr *saddr) +{ + const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr; + const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr; + const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr; + const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr; + + switch (daddr->sa_family) { + case AF_INET: + return saddr->sa_family == AF_INET && + validate_ipv4_net_dev(net_dev, daddr4, saddr4); + + case AF_INET6: + return saddr->sa_family == AF_INET6 && + validate_ipv6_net_dev(net_dev, daddr6, saddr6); + + default: + return false; + } +} + +static struct net_device * +roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event) +{ + const struct ib_gid_attr *sgid_attr = NULL; + struct net_device *ndev; + + if (ib_event->event == IB_CM_REQ_RECEIVED) + sgid_attr = ib_event->param.req_rcvd.ppath_sgid_attr; + else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) + sgid_attr = ib_event->param.sidr_req_rcvd.sgid_attr; + + if (!sgid_attr) + return NULL; + + rcu_read_lock(); + ndev = rdma_read_gid_attr_ndev_rcu(sgid_attr); + if (IS_ERR(ndev)) + ndev = NULL; + else + dev_hold(ndev); + rcu_read_unlock(); + return ndev; +} + +static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event, + struct cma_req_info *req) +{ + struct sockaddr *listen_addr = + (struct sockaddr *)&req->listen_addr_storage; + struct sockaddr *src_addr = (struct sockaddr *)&req->src_addr_storage; + struct net_device *net_dev; + const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL; + int err; + + err = cma_save_ip_info(listen_addr, src_addr, ib_event, + req->service_id); + if (err) + return ERR_PTR(err); + + if (rdma_protocol_roce(req->device, req->port)) + net_dev = roce_get_net_dev_by_cm_event(ib_event); + else + net_dev = ib_get_net_dev_by_params(req->device, req->port, + req->pkey, + gid, listen_addr); + if (!net_dev) + return ERR_PTR(-ENODEV); + + return net_dev; +} + +static enum rdma_ucm_port_space rdma_ps_from_service_id(__be64 service_id) +{ + return (be64_to_cpu(service_id) >> 16) & 0xffff; +} + +static bool cma_match_private_data(struct rdma_id_private *id_priv, + const struct cma_hdr *hdr) +{ + struct sockaddr *addr = cma_src_addr(id_priv); + __be32 ip4_addr; + struct in6_addr ip6_addr; + + if (cma_any_addr(addr) && !id_priv->afonly) + return true; + + switch (addr->sa_family) { + case AF_INET: + ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr; + if (cma_get_ip_ver(hdr) != 4) + return false; + if (!cma_any_addr(addr) && + hdr->dst_addr.ip4.addr != ip4_addr) + return false; + break; + case AF_INET6: + ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr; + if (cma_get_ip_ver(hdr) != 6) + return false; + if (!cma_any_addr(addr) && + memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr))) + return false; + break; + case AF_IB: + return true; + default: + return false; + } + + return true; +} + +static bool cma_protocol_roce(const struct rdma_cm_id *id) +{ + struct ib_device *device = id->device; + const u32 port_num = id->port_num ?: rdma_start_port(device); + + return rdma_protocol_roce(device, port_num); +} + +static bool cma_is_req_ipv6_ll(const struct cma_req_info *req) +{ + const struct sockaddr *daddr = + (const struct sockaddr *)&req->listen_addr_storage; + const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr; + + /* Returns true if the req is for IPv6 link local */ + return (daddr->sa_family == AF_INET6 && + (ipv6_addr_type(&daddr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)); +} + +static bool cma_match_net_dev(const struct rdma_cm_id *id, + const struct net_device *net_dev, + const struct cma_req_info *req) +{ + const struct rdma_addr *addr = &id->route.addr; + + if (!net_dev) + /* This request is an AF_IB request */ + return (!id->port_num || id->port_num == req->port) && + (addr->src_addr.ss_family == AF_IB); + + /* + * If the request is not for IPv6 link local, allow matching + * request to any netdevice of the one or multiport rdma device. + */ + if (!cma_is_req_ipv6_ll(req)) + return true; + /* + * Net namespaces must match, and if the listner is listening + * on a specific netdevice than netdevice must match as well. + */ + if (net_eq(dev_net(net_dev), addr->dev_addr.net) && + (!!addr->dev_addr.bound_dev_if == + (addr->dev_addr.bound_dev_if == net_dev->ifindex))) + return true; + else + return false; +} + +static struct rdma_id_private *cma_find_listener( + const struct rdma_bind_list *bind_list, + const struct ib_cm_id *cm_id, + const struct ib_cm_event *ib_event, + const struct cma_req_info *req, + const struct net_device *net_dev) +{ + struct rdma_id_private *id_priv, *id_priv_dev; + + lockdep_assert_held(&lock); + + if (!bind_list) + return ERR_PTR(-EINVAL); + + hlist_for_each_entry(id_priv, &bind_list->owners, node) { + if (cma_match_private_data(id_priv, ib_event->private_data)) { + if (id_priv->id.device == cm_id->device && + cma_match_net_dev(&id_priv->id, net_dev, req)) + return id_priv; + list_for_each_entry(id_priv_dev, + &id_priv->listen_list, + listen_item) { + if (id_priv_dev->id.device == cm_id->device && + cma_match_net_dev(&id_priv_dev->id, + net_dev, req)) + return id_priv_dev; + } + } + } + + return ERR_PTR(-EINVAL); +} + +static struct rdma_id_private * +cma_ib_id_from_event(struct ib_cm_id *cm_id, + const struct ib_cm_event *ib_event, + struct cma_req_info *req, + struct net_device **net_dev) +{ + struct rdma_bind_list *bind_list; + struct rdma_id_private *id_priv; + int err; + + err = cma_save_req_info(ib_event, req); + if (err) + return ERR_PTR(err); + + *net_dev = cma_get_net_dev(ib_event, req); + if (IS_ERR(*net_dev)) { + if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) { + /* Assuming the protocol is AF_IB */ + *net_dev = NULL; + } else { + return ERR_CAST(*net_dev); + } + } + + mutex_lock(&lock); + /* + * Net namespace might be getting deleted while route lookup, + * cm_id lookup is in progress. Therefore, perform netdevice + * validation, cm_id lookup under rcu lock. + * RCU lock along with netdevice state check, synchronizes with + * netdevice migrating to different net namespace and also avoids + * case where net namespace doesn't get deleted while lookup is in + * progress. + * If the device state is not IFF_UP, its properties such as ifindex + * and nd_net cannot be trusted to remain valid without rcu lock. + * net/core/dev.c change_net_namespace() ensures to synchronize with + * ongoing operations on net device after device is closed using + * synchronize_net(). + */ + rcu_read_lock(); + if (*net_dev) { + /* + * If netdevice is down, it is likely that it is administratively + * down or it might be migrating to different namespace. + * In that case avoid further processing, as the net namespace + * or ifindex may change. + */ + if (((*net_dev)->flags & IFF_UP) == 0) { + id_priv = ERR_PTR(-EHOSTUNREACH); + goto err; + } + + if (!validate_net_dev(*net_dev, + (struct sockaddr *)&req->src_addr_storage, + (struct sockaddr *)&req->listen_addr_storage)) { + id_priv = ERR_PTR(-EHOSTUNREACH); + goto err; + } + } + + bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net, + rdma_ps_from_service_id(req->service_id), + cma_port_from_service_id(req->service_id)); + id_priv = cma_find_listener(bind_list, cm_id, ib_event, req, *net_dev); +err: + rcu_read_unlock(); + mutex_unlock(&lock); + if (IS_ERR(id_priv) && *net_dev) { + dev_put(*net_dev); + *net_dev = NULL; + } + return id_priv; +} + +static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv) +{ + return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr); +} + +static void cma_cancel_route(struct rdma_id_private *id_priv) +{ + if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) { + if (id_priv->query) + ib_sa_cancel_query(id_priv->query_id, id_priv->query); + } +} + +static void _cma_cancel_listens(struct rdma_id_private *id_priv) +{ + struct rdma_id_private *dev_id_priv; + + lockdep_assert_held(&lock); + + /* + * Remove from listen_any_list to prevent added devices from spawning + * additional listen requests. + */ + list_del_init(&id_priv->listen_any_item); + + while (!list_empty(&id_priv->listen_list)) { + dev_id_priv = + list_first_entry(&id_priv->listen_list, + struct rdma_id_private, listen_item); + /* sync with device removal to avoid duplicate destruction */ + list_del_init(&dev_id_priv->device_item); + list_del_init(&dev_id_priv->listen_item); + mutex_unlock(&lock); + + rdma_destroy_id(&dev_id_priv->id); + mutex_lock(&lock); + } +} + +static void cma_cancel_listens(struct rdma_id_private *id_priv) +{ + mutex_lock(&lock); + _cma_cancel_listens(id_priv); + mutex_unlock(&lock); +} + +static void cma_cancel_operation(struct rdma_id_private *id_priv, + enum rdma_cm_state state) +{ + switch (state) { + case RDMA_CM_ADDR_QUERY: + /* + * We can avoid doing the rdma_addr_cancel() based on state, + * only RDMA_CM_ADDR_QUERY has a work that could still execute. + * Notice that the addr_handler work could still be exiting + * outside this state, however due to the interaction with the + * handler_mutex the work is guaranteed not to touch id_priv + * during exit. + */ + rdma_addr_cancel(&id_priv->id.route.addr.dev_addr); + break; + case RDMA_CM_ROUTE_QUERY: + cma_cancel_route(id_priv); + break; + case RDMA_CM_LISTEN: + if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev) + cma_cancel_listens(id_priv); + break; + default: + break; + } +} + +static void cma_release_port(struct rdma_id_private *id_priv) +{ + struct rdma_bind_list *bind_list = id_priv->bind_list; + struct net *net = id_priv->id.route.addr.dev_addr.net; + + if (!bind_list) + return; + + mutex_lock(&lock); + hlist_del(&id_priv->node); + if (hlist_empty(&bind_list->owners)) { + cma_ps_remove(net, bind_list->ps, bind_list->port); + kfree(bind_list); + } + mutex_unlock(&lock); +} + +static void destroy_mc(struct rdma_id_private *id_priv, + struct cma_multicast *mc) +{ + bool send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN); + + if (rdma_cap_ib_mcast(id_priv->id.device, id_priv->id.port_num)) + ib_sa_free_multicast(mc->sa_mc); + + if (rdma_protocol_roce(id_priv->id.device, id_priv->id.port_num)) { + struct rdma_dev_addr *dev_addr = + &id_priv->id.route.addr.dev_addr; + struct net_device *ndev = NULL; + + if (dev_addr->bound_dev_if) + ndev = dev_get_by_index(dev_addr->net, + dev_addr->bound_dev_if); + if (ndev && !send_only) { + enum ib_gid_type gid_type; + union ib_gid mgid; + + gid_type = id_priv->cma_dev->default_gid_type + [id_priv->id.port_num - + rdma_start_port( + id_priv->cma_dev->device)]; + cma_iboe_set_mgid((struct sockaddr *)&mc->addr, &mgid, + gid_type); + cma_igmp_send(ndev, &mgid, false); + } + dev_put(ndev); + + cancel_work_sync(&mc->iboe_join.work); + } + kfree(mc); +} + +static void cma_leave_mc_groups(struct rdma_id_private *id_priv) +{ + struct cma_multicast *mc; + + while (!list_empty(&id_priv->mc_list)) { + mc = list_first_entry(&id_priv->mc_list, struct cma_multicast, + list); + list_del(&mc->list); + destroy_mc(id_priv, mc); + } +} + +static void _destroy_id(struct rdma_id_private *id_priv, + enum rdma_cm_state state) +{ + cma_cancel_operation(id_priv, state); + + rdma_restrack_del(&id_priv->res); + cma_remove_id_from_tree(id_priv); + if (id_priv->cma_dev) { + if (rdma_cap_ib_cm(id_priv->id.device, 1)) { + if (id_priv->cm_id.ib) + ib_destroy_cm_id(id_priv->cm_id.ib); + } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) { + if (id_priv->cm_id.iw) + iw_destroy_cm_id(id_priv->cm_id.iw); + } + cma_leave_mc_groups(id_priv); + cma_release_dev(id_priv); + } + + cma_release_port(id_priv); + cma_id_put(id_priv); + wait_for_completion(&id_priv->comp); + + if (id_priv->internal_id) + cma_id_put(id_priv->id.context); + + kfree(id_priv->id.route.path_rec); + kfree(id_priv->id.route.path_rec_inbound); + kfree(id_priv->id.route.path_rec_outbound); + + put_net(id_priv->id.route.addr.dev_addr.net); + kfree(id_priv); +} + +/* + * destroy an ID from within the handler_mutex. This ensures that no other + * handlers can start running concurrently. + */ +static void destroy_id_handler_unlock(struct rdma_id_private *id_priv) + __releases(&idprv->handler_mutex) +{ + enum rdma_cm_state state; + unsigned long flags; + + trace_cm_id_destroy(id_priv); + + /* + * Setting the state to destroyed under the handler mutex provides a + * fence against calling handler callbacks. If this is invoked due to + * the failure of a handler callback then it guarentees that no future + * handlers will be called. + */ + lockdep_assert_held(&id_priv->handler_mutex); + spin_lock_irqsave(&id_priv->lock, flags); + state = id_priv->state; + id_priv->state = RDMA_CM_DESTROYING; + spin_unlock_irqrestore(&id_priv->lock, flags); + mutex_unlock(&id_priv->handler_mutex); + _destroy_id(id_priv, state); +} + +void rdma_destroy_id(struct rdma_cm_id *id) +{ + struct rdma_id_private *id_priv = + container_of(id, struct rdma_id_private, id); + + mutex_lock(&id_priv->handler_mutex); + destroy_id_handler_unlock(id_priv); +} +EXPORT_SYMBOL(rdma_destroy_id); + +static int cma_rep_recv(struct rdma_id_private *id_priv) +{ + int ret; + + ret = cma_modify_qp_rtr(id_priv, NULL); + if (ret) + goto reject; + + ret = cma_modify_qp_rts(id_priv, NULL); + if (ret) + goto reject; + + trace_cm_send_rtu(id_priv); + ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0); + if (ret) + goto reject; + + return 0; +reject: + pr_debug_ratelimited("RDMA CM: CONNECT_ERROR: failed to handle reply. status %d\n", ret); + cma_modify_qp_err(id_priv); + trace_cm_send_rej(id_priv); + ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED, + NULL, 0, NULL, 0); + return ret; +} + +static void cma_set_rep_event_data(struct rdma_cm_event *event, + const struct ib_cm_rep_event_param *rep_data, + void *private_data) +{ + event->param.conn.private_data = private_data; + event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE; + event->param.conn.responder_resources = rep_data->responder_resources; + event->param.conn.initiator_depth = rep_data->initiator_depth; + event->param.conn.flow_control = rep_data->flow_control; + event->param.conn.rnr_retry_count = rep_data->rnr_retry_count; + event->param.conn.srq = rep_data->srq; + event->param.conn.qp_num = rep_data->remote_qpn; + + event->ece.vendor_id = rep_data->ece.vendor_id; + event->ece.attr_mod = rep_data->ece.attr_mod; +} + +static int cma_cm_event_handler(struct rdma_id_private *id_priv, + struct rdma_cm_event *event) +{ + int ret; + + lockdep_assert_held(&id_priv->handler_mutex); + + trace_cm_event_handler(id_priv, event); + ret = id_priv->id.event_handler(&id_priv->id, event); + trace_cm_event_done(id_priv, event, ret); + return ret; +} + +static int cma_ib_handler(struct ib_cm_id *cm_id, + const struct ib_cm_event *ib_event) +{ + struct rdma_id_private *id_priv = cm_id->context; + struct rdma_cm_event event = {}; + enum rdma_cm_state state; + int ret; + + mutex_lock(&id_priv->handler_mutex); + state = READ_ONCE(id_priv->state); + if ((ib_event->event != IB_CM_TIMEWAIT_EXIT && + state != RDMA_CM_CONNECT) || + (ib_event->event == IB_CM_TIMEWAIT_EXIT && + state != RDMA_CM_DISCONNECT)) + goto out; + + switch (ib_event->event) { + case IB_CM_REQ_ERROR: + case IB_CM_REP_ERROR: + event.event = RDMA_CM_EVENT_UNREACHABLE; + event.status = -ETIMEDOUT; + break; + case IB_CM_REP_RECEIVED: + if (state == RDMA_CM_CONNECT && + (id_priv->id.qp_type != IB_QPT_UD)) { + trace_cm_send_mra(id_priv); + ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0); + } + if (id_priv->id.qp) { + event.status = cma_rep_recv(id_priv); + event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR : + RDMA_CM_EVENT_ESTABLISHED; + } else { + event.event = RDMA_CM_EVENT_CONNECT_RESPONSE; + } + cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd, + ib_event->private_data); + break; + case IB_CM_RTU_RECEIVED: + case IB_CM_USER_ESTABLISHED: + event.event = RDMA_CM_EVENT_ESTABLISHED; + break; + case IB_CM_DREQ_ERROR: + event.status = -ETIMEDOUT; + fallthrough; + case IB_CM_DREQ_RECEIVED: + case IB_CM_DREP_RECEIVED: + if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT, + RDMA_CM_DISCONNECT)) + goto out; + event.event = RDMA_CM_EVENT_DISCONNECTED; + break; + case IB_CM_TIMEWAIT_EXIT: + event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT; + break; + case IB_CM_MRA_RECEIVED: + /* ignore event */ + goto out; + case IB_CM_REJ_RECEIVED: + pr_debug_ratelimited("RDMA CM: REJECTED: %s\n", rdma_reject_msg(&id_priv->id, + ib_event->param.rej_rcvd.reason)); + cma_modify_qp_err(id_priv); + event.status = ib_event->param.rej_rcvd.reason; + event.event = RDMA_CM_EVENT_REJECTED; + event.param.conn.private_data = ib_event->private_data; + event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE; + break; + default: + pr_err("RDMA CMA: unexpected IB CM event: %d\n", + ib_event->event); + goto out; + } + + ret = cma_cm_event_handler(id_priv, &event); + if (ret) { + /* Destroy the CM ID by returning a non-zero value. */ + id_priv->cm_id.ib = NULL; + destroy_id_handler_unlock(id_priv); + return ret; + } +out: + mutex_unlock(&id_priv->handler_mutex); + return 0; +} + +static struct rdma_id_private * +cma_ib_new_conn_id(const struct rdma_cm_id *listen_id, + const struct ib_cm_event *ib_event, + struct net_device *net_dev) +{ + struct rdma_id_private *listen_id_priv; + struct rdma_id_private *id_priv; + struct rdma_cm_id *id; + struct rdma_route *rt; + const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family; + struct sa_path_rec *path = ib_event->param.req_rcvd.primary_path; + const __be64 service_id = + ib_event->param.req_rcvd.primary_path->service_id; + int ret; + + listen_id_priv = container_of(listen_id, struct rdma_id_private, id); + id_priv = __rdma_create_id(listen_id->route.addr.dev_addr.net, + listen_id->event_handler, listen_id->context, + listen_id->ps, + ib_event->param.req_rcvd.qp_type, + listen_id_priv); + if (IS_ERR(id_priv)) + return NULL; + + id = &id_priv->id; + if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr, + (struct sockaddr *)&id->route.addr.dst_addr, + listen_id, ib_event, ss_family, service_id)) + goto err; + + rt = &id->route; + rt->num_pri_alt_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1; + rt->path_rec = kmalloc_array(rt->num_pri_alt_paths, + sizeof(*rt->path_rec), GFP_KERNEL); + if (!rt->path_rec) + goto err; + + rt->path_rec[0] = *path; + if (rt->num_pri_alt_paths == 2) + rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path; + + if (net_dev) { + rdma_copy_src_l2_addr(&rt->addr.dev_addr, net_dev); + } else { + if (!cma_protocol_roce(listen_id) && + cma_any_addr(cma_src_addr(id_priv))) { + rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND; + rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid); + ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey)); + } else if (!cma_any_addr(cma_src_addr(id_priv))) { + ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr); + if (ret) + goto err; + } + } + rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid); + + id_priv->state = RDMA_CM_CONNECT; + return id_priv; + +err: + rdma_destroy_id(id); + return NULL; +} + +static struct rdma_id_private * +cma_ib_new_udp_id(const struct rdma_cm_id *listen_id, + const struct ib_cm_event *ib_event, + struct net_device *net_dev) +{ + const struct rdma_id_private *listen_id_priv; + struct rdma_id_private *id_priv; + struct rdma_cm_id *id; + const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family; + struct net *net = listen_id->route.addr.dev_addr.net; + int ret; + + listen_id_priv = container_of(listen_id, struct rdma_id_private, id); + id_priv = __rdma_create_id(net, listen_id->event_handler, + listen_id->context, listen_id->ps, IB_QPT_UD, + listen_id_priv); + if (IS_ERR(id_priv)) + return NULL; + + id = &id_priv->id; + if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr, + (struct sockaddr *)&id->route.addr.dst_addr, + listen_id, ib_event, ss_family, + ib_event->param.sidr_req_rcvd.service_id)) + goto err; + + if (net_dev) { + rdma_copy_src_l2_addr(&id->route.addr.dev_addr, net_dev); + } else { + if (!cma_any_addr(cma_src_addr(id_priv))) { + ret = cma_translate_addr(cma_src_addr(id_priv), + &id->route.addr.dev_addr); + if (ret) + goto err; + } + } + + id_priv->state = RDMA_CM_CONNECT; + return id_priv; +err: + rdma_destroy_id(id); + return NULL; +} + +static void cma_set_req_event_data(struct rdma_cm_event *event, + const struct ib_cm_req_event_param *req_data, + void *private_data, int offset) +{ + event->param.conn.private_data = private_data + offset; + event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset; + event->param.conn.responder_resources = req_data->responder_resources; + event->param.conn.initiator_depth = req_data->initiator_depth; + event->param.conn.flow_control = req_data->flow_control; + event->param.conn.retry_count = req_data->retry_count; + event->param.conn.rnr_retry_count = req_data->rnr_retry_count; + event->param.conn.srq = req_data->srq; + event->param.conn.qp_num = req_data->remote_qpn; + + event->ece.vendor_id = req_data->ece.vendor_id; + event->ece.attr_mod = req_data->ece.attr_mod; +} + +static int cma_ib_check_req_qp_type(const struct rdma_cm_id *id, + const struct ib_cm_event *ib_event) +{ + return (((ib_event->event == IB_CM_REQ_RECEIVED) && + (ib_event->param.req_rcvd.qp_type == id->qp_type)) || + ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) && + (id->qp_type == IB_QPT_UD)) || + (!id->qp_type)); +} + +static int cma_ib_req_handler(struct ib_cm_id *cm_id, + const struct ib_cm_event *ib_event) +{ + struct rdma_id_private *listen_id, *conn_id = NULL; + struct rdma_cm_event event = {}; + struct cma_req_info req = {}; + struct net_device *net_dev; + u8 offset; + int ret; + + listen_id = cma_ib_id_from_event(cm_id, ib_event, &req, &net_dev); + if (IS_ERR(listen_id)) + return PTR_ERR(listen_id); + + trace_cm_req_handler(listen_id, ib_event->event); + if (!cma_ib_check_req_qp_type(&listen_id->id, ib_event)) { + ret = -EINVAL; + goto net_dev_put; + } + + mutex_lock(&listen_id->handler_mutex); + if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN) { + ret = -ECONNABORTED; + goto err_unlock; + } + + offset = cma_user_data_offset(listen_id); + event.event = RDMA_CM_EVENT_CONNECT_REQUEST; + if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) { + conn_id = cma_ib_new_udp_id(&listen_id->id, ib_event, net_dev); + event.param.ud.private_data = ib_event->private_data + offset; + event.param.ud.private_data_len = + IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset; + } else { + conn_id = cma_ib_new_conn_id(&listen_id->id, ib_event, net_dev); + cma_set_req_event_data(&event, &ib_event->param.req_rcvd, + ib_event->private_data, offset); + } + if (!conn_id) { + ret = -ENOMEM; + goto err_unlock; + } + + mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING); + ret = cma_ib_acquire_dev(conn_id, listen_id, &req); + if (ret) { + destroy_id_handler_unlock(conn_id); + goto err_unlock; + } + + conn_id->cm_id.ib = cm_id; + cm_id->context = conn_id; + cm_id->cm_handler = cma_ib_handler; + + ret = cma_cm_event_handler(conn_id, &event); + if (ret) { + /* Destroy the CM ID by returning a non-zero value. */ + conn_id->cm_id.ib = NULL; + mutex_unlock(&listen_id->handler_mutex); + destroy_id_handler_unlock(conn_id); + goto net_dev_put; + } + + if (READ_ONCE(conn_id->state) == RDMA_CM_CONNECT && + conn_id->id.qp_type != IB_QPT_UD) { + trace_cm_send_mra(cm_id->context); + ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0); + } + mutex_unlock(&conn_id->handler_mutex); + +err_unlock: + mutex_unlock(&listen_id->handler_mutex); + +net_dev_put: + if (net_dev) + dev_put(net_dev); + + return ret; +} + +__be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr) +{ + if (addr->sa_family == AF_IB) + return ((struct sockaddr_ib *) addr)->sib_sid; + + return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr))); +} +EXPORT_SYMBOL(rdma_get_service_id); + +void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid, + union ib_gid *dgid) +{ + struct rdma_addr *addr = &cm_id->route.addr; + + if (!cm_id->device) { + if (sgid) + memset(sgid, 0, sizeof(*sgid)); + if (dgid) + memset(dgid, 0, sizeof(*dgid)); + return; + } + + if (rdma_protocol_roce(cm_id->device, cm_id->port_num)) { + if (sgid) + rdma_ip2gid((struct sockaddr *)&addr->src_addr, sgid); + if (dgid) + rdma_ip2gid((struct sockaddr *)&addr->dst_addr, dgid); + } else { + if (sgid) + rdma_addr_get_sgid(&addr->dev_addr, sgid); + if (dgid) + rdma_addr_get_dgid(&addr->dev_addr, dgid); + } +} +EXPORT_SYMBOL(rdma_read_gids); + +static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event) +{ + struct rdma_id_private *id_priv = iw_id->context; + struct rdma_cm_event event = {}; + int ret = 0; + struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr; + struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr; + + mutex_lock(&id_priv->handler_mutex); + if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT) + goto out; + + switch (iw_event->event) { + case IW_CM_EVENT_CLOSE: + event.event = RDMA_CM_EVENT_DISCONNECTED; + break; + case IW_CM_EVENT_CONNECT_REPLY: + memcpy(cma_src_addr(id_priv), laddr, + rdma_addr_size(laddr)); + memcpy(cma_dst_addr(id_priv), raddr, + rdma_addr_size(raddr)); + switch (iw_event->status) { + case 0: + event.event = RDMA_CM_EVENT_ESTABLISHED; + event.param.conn.initiator_depth = iw_event->ird; + event.param.conn.responder_resources = iw_event->ord; + break; + case -ECONNRESET: + case -ECONNREFUSED: + event.event = RDMA_CM_EVENT_REJECTED; + break; + case -ETIMEDOUT: + event.event = RDMA_CM_EVENT_UNREACHABLE; + break; + default: + event.event = RDMA_CM_EVENT_CONNECT_ERROR; + break; + } + break; + case IW_CM_EVENT_ESTABLISHED: + event.event = RDMA_CM_EVENT_ESTABLISHED; + event.param.conn.initiator_depth = iw_event->ird; + event.param.conn.responder_resources = iw_event->ord; + break; + default: + goto out; + } + + event.status = iw_event->status; + event.param.conn.private_data = iw_event->private_data; + event.param.conn.private_data_len = iw_event->private_data_len; + ret = cma_cm_event_handler(id_priv, &event); + if (ret) { + /* Destroy the CM ID by returning a non-zero value. */ + id_priv->cm_id.iw = NULL; + destroy_id_handler_unlock(id_priv); + return ret; + } + +out: + mutex_unlock(&id_priv->handler_mutex); + return ret; +} + +static int iw_conn_req_handler(struct iw_cm_id *cm_id, + struct iw_cm_event *iw_event) +{ + struct rdma_id_private *listen_id, *conn_id; + struct rdma_cm_event event = {}; + int ret = -ECONNABORTED; + struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr; + struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr; + + event.event = RDMA_CM_EVENT_CONNECT_REQUEST; + event.param.conn.private_data = iw_event->private_data; + event.param.conn.private_data_len = iw_event->private_data_len; + event.param.conn.initiator_depth = iw_event->ird; + event.param.conn.responder_resources = iw_event->ord; + + listen_id = cm_id->context; + + mutex_lock(&listen_id->handler_mutex); + if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN) + goto out; + + /* Create a new RDMA id for the new IW CM ID */ + conn_id = __rdma_create_id(listen_id->id.route.addr.dev_addr.net, + listen_id->id.event_handler, + listen_id->id.context, RDMA_PS_TCP, + IB_QPT_RC, listen_id); + if (IS_ERR(conn_id)) { + ret = -ENOMEM; + goto out; + } + mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING); + conn_id->state = RDMA_CM_CONNECT; + + ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr); + if (ret) { + mutex_unlock(&listen_id->handler_mutex); + destroy_id_handler_unlock(conn_id); + return ret; + } + + ret = cma_iw_acquire_dev(conn_id, listen_id); + if (ret) { + mutex_unlock(&listen_id->handler_mutex); + destroy_id_handler_unlock(conn_id); + return ret; + } + + conn_id->cm_id.iw = cm_id; + cm_id->context = conn_id; + cm_id->cm_handler = cma_iw_handler; + + memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr)); + memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr)); + + ret = cma_cm_event_handler(conn_id, &event); + if (ret) { + /* User wants to destroy the CM ID */ + conn_id->cm_id.iw = NULL; + mutex_unlock(&listen_id->handler_mutex); + destroy_id_handler_unlock(conn_id); + return ret; + } + + mutex_unlock(&conn_id->handler_mutex); + +out: + mutex_unlock(&listen_id->handler_mutex); + return ret; +} + +static int cma_ib_listen(struct rdma_id_private *id_priv) +{ + struct sockaddr *addr; + struct ib_cm_id *id; + __be64 svc_id; + + addr = cma_src_addr(id_priv); + svc_id = rdma_get_service_id(&id_priv->id, addr); + id = ib_cm_insert_listen(id_priv->id.device, + cma_ib_req_handler, svc_id); + if (IS_ERR(id)) + return PTR_ERR(id); + id_priv->cm_id.ib = id; + + return 0; +} + +static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog) +{ + int ret; + struct iw_cm_id *id; + + id = iw_create_cm_id(id_priv->id.device, + iw_conn_req_handler, + id_priv); + if (IS_ERR(id)) + return PTR_ERR(id); + + mutex_lock(&id_priv->qp_mutex); + id->tos = id_priv->tos; + id->tos_set = id_priv->tos_set; + mutex_unlock(&id_priv->qp_mutex); + id->afonly = id_priv->afonly; + id_priv->cm_id.iw = id; + + memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv), + rdma_addr_size(cma_src_addr(id_priv))); + + ret = iw_cm_listen(id_priv->cm_id.iw, backlog); + + if (ret) { + iw_destroy_cm_id(id_priv->cm_id.iw); + id_priv->cm_id.iw = NULL; + } + + return ret; +} + +static int cma_listen_handler(struct rdma_cm_id *id, + struct rdma_cm_event *event) +{ + struct rdma_id_private *id_priv = id->context; + + /* Listening IDs are always destroyed on removal */ + if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL) + return -1; + + id->context = id_priv->id.context; + id->event_handler = id_priv->id.event_handler; + trace_cm_event_handler(id_priv, event); + return id_priv->id.event_handler(id, event); +} + +static int cma_listen_on_dev(struct rdma_id_private *id_priv, + struct cma_device *cma_dev, + struct rdma_id_private **to_destroy) +{ + struct rdma_id_private *dev_id_priv; + struct net *net = id_priv->id.route.addr.dev_addr.net; + int ret; + + lockdep_assert_held(&lock); + + *to_destroy = NULL; + if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1)) + return 0; + + dev_id_priv = + __rdma_create_id(net, cma_listen_handler, id_priv, + id_priv->id.ps, id_priv->id.qp_type, id_priv); + if (IS_ERR(dev_id_priv)) + return PTR_ERR(dev_id_priv); + + dev_id_priv->state = RDMA_CM_ADDR_BOUND; + memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv), + rdma_addr_size(cma_src_addr(id_priv))); + + _cma_attach_to_dev(dev_id_priv, cma_dev); + rdma_restrack_add(&dev_id_priv->res); + cma_id_get(id_priv); + dev_id_priv->internal_id = 1; + dev_id_priv->afonly = id_priv->afonly; + mutex_lock(&id_priv->qp_mutex); + dev_id_priv->tos_set = id_priv->tos_set; + dev_id_priv->tos = id_priv->tos; + mutex_unlock(&id_priv->qp_mutex); + + ret = rdma_listen(&dev_id_priv->id, id_priv->backlog); + if (ret) + goto err_listen; + list_add_tail(&dev_id_priv->listen_item, &id_priv->listen_list); + return 0; +err_listen: + /* Caller must destroy this after releasing lock */ + *to_destroy = dev_id_priv; + dev_warn(&cma_dev->device->dev, "RDMA CMA: %s, error %d\n", __func__, ret); + return ret; +} + +static int cma_listen_on_all(struct rdma_id_private *id_priv) +{ + struct rdma_id_private *to_destroy; + struct cma_device *cma_dev; + int ret; + + mutex_lock(&lock); + list_add_tail(&id_priv->listen_any_item, &listen_any_list); + list_for_each_entry(cma_dev, &dev_list, list) { + ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy); + if (ret) { + /* Prevent racing with cma_process_remove() */ + if (to_destroy) + list_del_init(&to_destroy->device_item); + goto err_listen; + } + } + mutex_unlock(&lock); + return 0; + +err_listen: + _cma_cancel_listens(id_priv); + mutex_unlock(&lock); + if (to_destroy) + rdma_destroy_id(&to_destroy->id); + return ret; +} + +void rdma_set_service_type(struct rdma_cm_id *id, int tos) +{ + struct rdma_id_private *id_priv; + + id_priv = container_of(id, struct rdma_id_private, id); + mutex_lock(&id_priv->qp_mutex); + id_priv->tos = (u8) tos; + id_priv->tos_set = true; + mutex_unlock(&id_priv->qp_mutex); +} +EXPORT_SYMBOL(rdma_set_service_type); + +/** + * rdma_set_ack_timeout() - Set the ack timeout of QP associated + * with a connection identifier. + * @id: Communication identifier to associated with service type. + * @timeout: Ack timeout to set a QP, expressed as 4.096 * 2^(timeout) usec. + * + * This function should be called before rdma_connect() on active side, + * and on passive side before rdma_accept(). It is applicable to primary + * path only. The timeout will affect the local side of the QP, it is not + * negotiated with remote side and zero disables the timer. In case it is + * set before rdma_resolve_route, the value will also be used to determine + * PacketLifeTime for RoCE. + * + * Return: 0 for success + */ +int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout) +{ + struct rdma_id_private *id_priv; + + if (id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_INI) + return -EINVAL; + + id_priv = container_of(id, struct rdma_id_private, id); + mutex_lock(&id_priv->qp_mutex); + id_priv->timeout = timeout; + id_priv->timeout_set = true; + mutex_unlock(&id_priv->qp_mutex); + + return 0; +} +EXPORT_SYMBOL(rdma_set_ack_timeout); + +/** + * rdma_set_min_rnr_timer() - Set the minimum RNR Retry timer of the + * QP associated with a connection identifier. + * @id: Communication identifier to associated with service type. + * @min_rnr_timer: 5-bit value encoded as Table 45: "Encoding for RNR NAK + * Timer Field" in the IBTA specification. + * + * This function should be called before rdma_connect() on active + * side, and on passive side before rdma_accept(). The timer value + * will be associated with the local QP. When it receives a send it is + * not read to handle, typically if the receive queue is empty, an RNR + * Retry NAK is returned to the requester with the min_rnr_timer + * encoded. The requester will then wait at least the time specified + * in the NAK before retrying. The default is zero, which translates + * to a minimum RNR Timer value of 655 ms. + * + * Return: 0 for success + */ +int rdma_set_min_rnr_timer(struct rdma_cm_id *id, u8 min_rnr_timer) +{ + struct rdma_id_private *id_priv; + + /* It is a five-bit value */ + if (min_rnr_timer & 0xe0) + return -EINVAL; + + if (WARN_ON(id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_TGT)) + return -EINVAL; + + id_priv = container_of(id, struct rdma_id_private, id); + mutex_lock(&id_priv->qp_mutex); + id_priv->min_rnr_timer = min_rnr_timer; + id_priv->min_rnr_timer_set = true; + mutex_unlock(&id_priv->qp_mutex); + + return 0; +} +EXPORT_SYMBOL(rdma_set_min_rnr_timer); + +static void route_set_path_rec_inbound(struct cma_work *work, + struct sa_path_rec *path_rec) +{ + struct rdma_route *route = &work->id->id.route; + + if (!route->path_rec_inbound) { + route->path_rec_inbound = + kzalloc(sizeof(*route->path_rec_inbound), GFP_KERNEL); + if (!route->path_rec_inbound) + return; + } + + *route->path_rec_inbound = *path_rec; +} + +static void route_set_path_rec_outbound(struct cma_work *work, + struct sa_path_rec *path_rec) +{ + struct rdma_route *route = &work->id->id.route; + + if (!route->path_rec_outbound) { + route->path_rec_outbound = + kzalloc(sizeof(*route->path_rec_outbound), GFP_KERNEL); + if (!route->path_rec_outbound) + return; + } + + *route->path_rec_outbound = *path_rec; +} + +static void cma_query_handler(int status, struct sa_path_rec *path_rec, + int num_prs, void *context) +{ + struct cma_work *work = context; + struct rdma_route *route; + int i; + + route = &work->id->id.route; + + if (status) + goto fail; + + for (i = 0; i < num_prs; i++) { + if (!path_rec[i].flags || (path_rec[i].flags & IB_PATH_GMP)) + *route->path_rec = path_rec[i]; + else if (path_rec[i].flags & IB_PATH_INBOUND) + route_set_path_rec_inbound(work, &path_rec[i]); + else if (path_rec[i].flags & IB_PATH_OUTBOUND) + route_set_path_rec_outbound(work, &path_rec[i]); + } + if (!route->path_rec) { + status = -EINVAL; + goto fail; + } + + route->num_pri_alt_paths = 1; + queue_work(cma_wq, &work->work); + return; + +fail: + work->old_state = RDMA_CM_ROUTE_QUERY; + work->new_state = RDMA_CM_ADDR_RESOLVED; + work->event.event = RDMA_CM_EVENT_ROUTE_ERROR; + work->event.status = status; + pr_debug_ratelimited("RDMA CM: ROUTE_ERROR: failed to query path. status %d\n", + status); + queue_work(cma_wq, &work->work); +} + +static int cma_query_ib_route(struct rdma_id_private *id_priv, + unsigned long timeout_ms, struct cma_work *work) +{ + struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; + struct sa_path_rec path_rec; + ib_sa_comp_mask comp_mask; + struct sockaddr_in6 *sin6; + struct sockaddr_ib *sib; + + memset(&path_rec, 0, sizeof path_rec); + + if (rdma_cap_opa_ah(id_priv->id.device, id_priv->id.port_num)) + path_rec.rec_type = SA_PATH_REC_TYPE_OPA; + else + path_rec.rec_type = SA_PATH_REC_TYPE_IB; + rdma_addr_get_sgid(dev_addr, &path_rec.sgid); + rdma_addr_get_dgid(dev_addr, &path_rec.dgid); + path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr)); + path_rec.numb_path = 1; + path_rec.reversible = 1; + path_rec.service_id = rdma_get_service_id(&id_priv->id, + cma_dst_addr(id_priv)); + + comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID | + IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH | + IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID; + + switch (cma_family(id_priv)) { + case AF_INET: + path_rec.qos_class = cpu_to_be16((u16) id_priv->tos); + comp_mask |= IB_SA_PATH_REC_QOS_CLASS; + break; + case AF_INET6: + sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv); + path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20); + comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS; + break; + case AF_IB: + sib = (struct sockaddr_ib *) cma_src_addr(id_priv); + path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20); + comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS; + break; + } + + id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device, + id_priv->id.port_num, &path_rec, + comp_mask, timeout_ms, + GFP_KERNEL, cma_query_handler, + work, &id_priv->query); + + return (id_priv->query_id < 0) ? id_priv->query_id : 0; +} + +static void cma_iboe_join_work_handler(struct work_struct *work) +{ + struct cma_multicast *mc = + container_of(work, struct cma_multicast, iboe_join.work); + struct rdma_cm_event *event = &mc->iboe_join.event; + struct rdma_id_private *id_priv = mc->id_priv; + int ret; + + mutex_lock(&id_priv->handler_mutex); + if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING || + READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL) + goto out_unlock; + + ret = cma_cm_event_handler(id_priv, event); + WARN_ON(ret); + +out_unlock: + mutex_unlock(&id_priv->handler_mutex); + if (event->event == RDMA_CM_EVENT_MULTICAST_JOIN) + rdma_destroy_ah_attr(&event->param.ud.ah_attr); +} + +static void cma_work_handler(struct work_struct *_work) +{ + struct cma_work *work = container_of(_work, struct cma_work, work); + struct rdma_id_private *id_priv = work->id; + + mutex_lock(&id_priv->handler_mutex); + if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING || + READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL) + goto out_unlock; + if (work->old_state != 0 || work->new_state != 0) { + if (!cma_comp_exch(id_priv, work->old_state, work->new_state)) + goto out_unlock; + } + + if (cma_cm_event_handler(id_priv, &work->event)) { + cma_id_put(id_priv); + destroy_id_handler_unlock(id_priv); + goto out_free; + } + +out_unlock: + mutex_unlock(&id_priv->handler_mutex); + cma_id_put(id_priv); +out_free: + if (work->event.event == RDMA_CM_EVENT_MULTICAST_JOIN) + rdma_destroy_ah_attr(&work->event.param.ud.ah_attr); + kfree(work); +} + +static void cma_init_resolve_route_work(struct cma_work *work, + struct rdma_id_private *id_priv) +{ + work->id = id_priv; + INIT_WORK(&work->work, cma_work_handler); + work->old_state = RDMA_CM_ROUTE_QUERY; + work->new_state = RDMA_CM_ROUTE_RESOLVED; + work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED; +} + +static void enqueue_resolve_addr_work(struct cma_work *work, + struct rdma_id_private *id_priv) +{ + /* Balances with cma_id_put() in cma_work_handler */ + cma_id_get(id_priv); + + work->id = id_priv; + INIT_WORK(&work->work, cma_work_handler); + work->old_state = RDMA_CM_ADDR_QUERY; + work->new_state = RDMA_CM_ADDR_RESOLVED; + work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED; + + queue_work(cma_wq, &work->work); +} + +static int cma_resolve_ib_route(struct rdma_id_private *id_priv, + unsigned long timeout_ms) +{ + struct rdma_route *route = &id_priv->id.route; + struct cma_work *work; + int ret; + + work = kzalloc(sizeof *work, GFP_KERNEL); + if (!work) + return -ENOMEM; + + cma_init_resolve_route_work(work, id_priv); + + if (!route->path_rec) + route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL); + if (!route->path_rec) { + ret = -ENOMEM; + goto err1; + } + + ret = cma_query_ib_route(id_priv, timeout_ms, work); + if (ret) + goto err2; + + return 0; +err2: + kfree(route->path_rec); + route->path_rec = NULL; +err1: + kfree(work); + return ret; +} + +static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type, + unsigned long supported_gids, + enum ib_gid_type default_gid) +{ + if ((network_type == RDMA_NETWORK_IPV4 || + network_type == RDMA_NETWORK_IPV6) && + test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids)) + return IB_GID_TYPE_ROCE_UDP_ENCAP; + + return default_gid; +} + +/* + * cma_iboe_set_path_rec_l2_fields() is helper function which sets + * path record type based on GID type. + * It also sets up other L2 fields which includes destination mac address + * netdev ifindex, of the path record. + * It returns the netdev of the bound interface for this path record entry. + */ +static struct net_device * +cma_iboe_set_path_rec_l2_fields(struct rdma_id_private *id_priv) +{ + struct rdma_route *route = &id_priv->id.route; + enum ib_gid_type gid_type = IB_GID_TYPE_ROCE; + struct rdma_addr *addr = &route->addr; + unsigned long supported_gids; + struct net_device *ndev; + + if (!addr->dev_addr.bound_dev_if) + return NULL; + + ndev = dev_get_by_index(addr->dev_addr.net, + addr->dev_addr.bound_dev_if); + if (!ndev) + return NULL; + + supported_gids = roce_gid_type_mask_support(id_priv->id.device, + id_priv->id.port_num); + gid_type = cma_route_gid_type(addr->dev_addr.network, + supported_gids, + id_priv->gid_type); + /* Use the hint from IP Stack to select GID Type */ + if (gid_type < ib_network_to_gid_type(addr->dev_addr.network)) + gid_type = ib_network_to_gid_type(addr->dev_addr.network); + route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type); + + route->path_rec->roce.route_resolved = true; + sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr); + return ndev; +} + +int rdma_set_ib_path(struct rdma_cm_id *id, + struct sa_path_rec *path_rec) +{ + struct rdma_id_private *id_priv; + struct net_device *ndev; + int ret; + + id_priv = container_of(id, struct rdma_id_private, id); + if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, + RDMA_CM_ROUTE_RESOLVED)) + return -EINVAL; + + id->route.path_rec = kmemdup(path_rec, sizeof(*path_rec), + GFP_KERNEL); + if (!id->route.path_rec) { + ret = -ENOMEM; + goto err; + } + + if (rdma_protocol_roce(id->device, id->port_num)) { + ndev = cma_iboe_set_path_rec_l2_fields(id_priv); + if (!ndev) { + ret = -ENODEV; + goto err_free; + } + dev_put(ndev); + } + + id->route.num_pri_alt_paths = 1; + return 0; + +err_free: + kfree(id->route.path_rec); + id->route.path_rec = NULL; +err: + cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED); + return ret; +} +EXPORT_SYMBOL(rdma_set_ib_path); + +static int cma_resolve_iw_route(struct rdma_id_private *id_priv) +{ + struct cma_work *work; + + work = kzalloc(sizeof *work, GFP_KERNEL); + if (!work) + return -ENOMEM; + + cma_init_resolve_route_work(work, id_priv); + queue_work(cma_wq, &work->work); + return 0; +} + +static int get_vlan_ndev_tc(struct net_device *vlan_ndev, int prio) +{ + struct net_device *dev; + + dev = vlan_dev_real_dev(vlan_ndev); + if (dev->num_tc) + return netdev_get_prio_tc_map(dev, prio); + + return (vlan_dev_get_egress_qos_mask(vlan_ndev, prio) & + VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT; +} + +struct iboe_prio_tc_map { + int input_prio; + int output_tc; + bool found; +}; + +static int get_lower_vlan_dev_tc(struct net_device *dev, + struct netdev_nested_priv *priv) +{ + struct iboe_prio_tc_map *map = (struct iboe_prio_tc_map *)priv->data; + + if (is_vlan_dev(dev)) + map->output_tc = get_vlan_ndev_tc(dev, map->input_prio); + else if (dev->num_tc) + map->output_tc = netdev_get_prio_tc_map(dev, map->input_prio); + else + map->output_tc = 0; + /* We are interested only in first level VLAN device, so always + * return 1 to stop iterating over next level devices. + */ + map->found = true; + return 1; +} + +static int iboe_tos_to_sl(struct net_device *ndev, int tos) +{ + struct iboe_prio_tc_map prio_tc_map = {}; + int prio = rt_tos2priority(tos); + struct netdev_nested_priv priv; + + /* If VLAN device, get it directly from the VLAN netdev */ + if (is_vlan_dev(ndev)) + return get_vlan_ndev_tc(ndev, prio); + + prio_tc_map.input_prio = prio; + priv.data = (void *)&prio_tc_map; + rcu_read_lock(); + netdev_walk_all_lower_dev_rcu(ndev, + get_lower_vlan_dev_tc, + &priv); + rcu_read_unlock(); + /* If map is found from lower device, use it; Otherwise + * continue with the current netdevice to get priority to tc map. + */ + if (prio_tc_map.found) + return prio_tc_map.output_tc; + else if (ndev->num_tc) + return netdev_get_prio_tc_map(ndev, prio); + else + return 0; +} + +static __be32 cma_get_roce_udp_flow_label(struct rdma_id_private *id_priv) +{ + struct sockaddr_in6 *addr6; + u16 dport, sport; + u32 hash, fl; + + addr6 = (struct sockaddr_in6 *)cma_src_addr(id_priv); + fl = be32_to_cpu(addr6->sin6_flowinfo) & IB_GRH_FLOWLABEL_MASK; + if ((cma_family(id_priv) != AF_INET6) || !fl) { + dport = be16_to_cpu(cma_port(cma_dst_addr(id_priv))); + sport = be16_to_cpu(cma_port(cma_src_addr(id_priv))); + hash = (u32)sport * 31 + dport; + fl = hash & IB_GRH_FLOWLABEL_MASK; + } + + return cpu_to_be32(fl); +} + +static int cma_resolve_iboe_route(struct rdma_id_private *id_priv) +{ + struct rdma_route *route = &id_priv->id.route; + struct rdma_addr *addr = &route->addr; + struct cma_work *work; + int ret; + struct net_device *ndev; + + u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num - + rdma_start_port(id_priv->cma_dev->device)]; + u8 tos; + + mutex_lock(&id_priv->qp_mutex); + tos = id_priv->tos_set ? id_priv->tos : default_roce_tos; + mutex_unlock(&id_priv->qp_mutex); + + work = kzalloc(sizeof *work, GFP_KERNEL); + if (!work) + return -ENOMEM; + + route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL); + if (!route->path_rec) { + ret = -ENOMEM; + goto err1; + } + + route->num_pri_alt_paths = 1; + + ndev = cma_iboe_set_path_rec_l2_fields(id_priv); + if (!ndev) { + ret = -ENODEV; + goto err2; + } + + rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr, + &route->path_rec->sgid); + rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr, + &route->path_rec->dgid); + + if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB) + /* TODO: get the hoplimit from the inet/inet6 device */ + route->path_rec->hop_limit = addr->dev_addr.hoplimit; + else + route->path_rec->hop_limit = 1; + route->path_rec->reversible = 1; + route->path_rec->pkey = cpu_to_be16(0xffff); + route->path_rec->mtu_selector = IB_SA_EQ; + route->path_rec->sl = iboe_tos_to_sl(ndev, tos); + route->path_rec->traffic_class = tos; + route->path_rec->mtu = iboe_get_mtu(ndev->mtu); + route->path_rec->rate_selector = IB_SA_EQ; + route->path_rec->rate = IB_RATE_PORT_CURRENT; + dev_put(ndev); + route->path_rec->packet_life_time_selector = IB_SA_EQ; + /* In case ACK timeout is set, use this value to calculate + * PacketLifeTime. As per IBTA 12.7.34, + * local ACK timeout = (2 * PacketLifeTime + Local CA’s ACK delay). + * Assuming a negligible local ACK delay, we can use + * PacketLifeTime = local ACK timeout/2 + * as a reasonable approximation for RoCE networks. + */ + mutex_lock(&id_priv->qp_mutex); + if (id_priv->timeout_set && id_priv->timeout) + route->path_rec->packet_life_time = id_priv->timeout - 1; + else + route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME; + mutex_unlock(&id_priv->qp_mutex); + + if (!route->path_rec->mtu) { + ret = -EINVAL; + goto err2; + } + + if (rdma_protocol_roce_udp_encap(id_priv->id.device, + id_priv->id.port_num)) + route->path_rec->flow_label = + cma_get_roce_udp_flow_label(id_priv); + + cma_init_resolve_route_work(work, id_priv); + queue_work(cma_wq, &work->work); + + return 0; + +err2: + kfree(route->path_rec); + route->path_rec = NULL; + route->num_pri_alt_paths = 0; +err1: + kfree(work); + return ret; +} + +int rdma_resolve_route(struct rdma_cm_id *id, unsigned long timeout_ms) +{ + struct rdma_id_private *id_priv; + int ret; + + if (!timeout_ms) + return -EINVAL; + + id_priv = container_of(id, struct rdma_id_private, id); + if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY)) + return -EINVAL; + + cma_id_get(id_priv); + if (rdma_cap_ib_sa(id->device, id->port_num)) + ret = cma_resolve_ib_route(id_priv, timeout_ms); + else if (rdma_protocol_roce(id->device, id->port_num)) { + ret = cma_resolve_iboe_route(id_priv); + if (!ret) + cma_add_id_to_tree(id_priv); + } + else if (rdma_protocol_iwarp(id->device, id->port_num)) + ret = cma_resolve_iw_route(id_priv); + else + ret = -ENOSYS; + + if (ret) + goto err; + + return 0; +err: + cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED); + cma_id_put(id_priv); + return ret; +} +EXPORT_SYMBOL(rdma_resolve_route); + +static void cma_set_loopback(struct sockaddr *addr) +{ + switch (addr->sa_family) { + case AF_INET: + ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK); + break; + case AF_INET6: + ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr, + 0, 0, 0, htonl(1)); + break; + default: + ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr, + 0, 0, 0, htonl(1)); + break; + } +} + +static int cma_bind_loopback(struct rdma_id_private *id_priv) +{ + struct cma_device *cma_dev, *cur_dev; + union ib_gid gid; + enum ib_port_state port_state; + unsigned int p; + u16 pkey; + int ret; + + cma_dev = NULL; + mutex_lock(&lock); + list_for_each_entry(cur_dev, &dev_list, list) { + if (cma_family(id_priv) == AF_IB && + !rdma_cap_ib_cm(cur_dev->device, 1)) + continue; + + if (!cma_dev) + cma_dev = cur_dev; + + rdma_for_each_port (cur_dev->device, p) { + if (!ib_get_cached_port_state(cur_dev->device, p, &port_state) && + port_state == IB_PORT_ACTIVE) { + cma_dev = cur_dev; + goto port_found; + } + } + } + + if (!cma_dev) { + ret = -ENODEV; + goto out; + } + + p = 1; + +port_found: + ret = rdma_query_gid(cma_dev->device, p, 0, &gid); + if (ret) + goto out; + + ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey); + if (ret) + goto out; + + id_priv->id.route.addr.dev_addr.dev_type = + (rdma_protocol_ib(cma_dev->device, p)) ? + ARPHRD_INFINIBAND : ARPHRD_ETHER; + + rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid); + ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey); + id_priv->id.port_num = p; + cma_attach_to_dev(id_priv, cma_dev); + rdma_restrack_add(&id_priv->res); + cma_set_loopback(cma_src_addr(id_priv)); +out: + mutex_unlock(&lock); + return ret; +} + +static void addr_handler(int status, struct sockaddr *src_addr, + struct rdma_dev_addr *dev_addr, void *context) +{ + struct rdma_id_private *id_priv = context; + struct rdma_cm_event event = {}; + struct sockaddr *addr; + struct sockaddr_storage old_addr; + + mutex_lock(&id_priv->handler_mutex); + if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, + RDMA_CM_ADDR_RESOLVED)) + goto out; + + /* + * Store the previous src address, so that if we fail to acquire + * matching rdma device, old address can be restored back, which helps + * to cancel the cma listen operation correctly. + */ + addr = cma_src_addr(id_priv); + memcpy(&old_addr, addr, rdma_addr_size(addr)); + memcpy(addr, src_addr, rdma_addr_size(src_addr)); + if (!status && !id_priv->cma_dev) { + status = cma_acquire_dev_by_src_ip(id_priv); + if (status) + pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n", + status); + rdma_restrack_add(&id_priv->res); + } else if (status) { + pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status); + } + + if (status) { + memcpy(addr, &old_addr, + rdma_addr_size((struct sockaddr *)&old_addr)); + if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, + RDMA_CM_ADDR_BOUND)) + goto out; + event.event = RDMA_CM_EVENT_ADDR_ERROR; + event.status = status; + } else + event.event = RDMA_CM_EVENT_ADDR_RESOLVED; + + if (cma_cm_event_handler(id_priv, &event)) { + destroy_id_handler_unlock(id_priv); + return; + } +out: + mutex_unlock(&id_priv->handler_mutex); +} + +static int cma_resolve_loopback(struct rdma_id_private *id_priv) +{ + struct cma_work *work; + union ib_gid gid; + int ret; + + work = kzalloc(sizeof *work, GFP_KERNEL); + if (!work) + return -ENOMEM; + + if (!id_priv->cma_dev) { + ret = cma_bind_loopback(id_priv); + if (ret) + goto err; + } + + rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid); + rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid); + + enqueue_resolve_addr_work(work, id_priv); + return 0; +err: + kfree(work); + return ret; +} + +static int cma_resolve_ib_addr(struct rdma_id_private *id_priv) +{ + struct cma_work *work; + int ret; + + work = kzalloc(sizeof *work, GFP_KERNEL); + if (!work) + return -ENOMEM; + + if (!id_priv->cma_dev) { + ret = cma_resolve_ib_dev(id_priv); + if (ret) + goto err; + } + + rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *) + &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr)); + + enqueue_resolve_addr_work(work, id_priv); + return 0; +err: + kfree(work); + return ret; +} + +static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr, + const struct sockaddr *dst_addr) +{ + struct sockaddr_storage zero_sock = {}; + + if (src_addr && src_addr->sa_family) + return rdma_bind_addr(id, src_addr); + + /* + * When the src_addr is not specified, automatically supply an any addr + */ + zero_sock.ss_family = dst_addr->sa_family; + if (IS_ENABLED(CONFIG_IPV6) && dst_addr->sa_family == AF_INET6) { + struct sockaddr_in6 *src_addr6 = + (struct sockaddr_in6 *)&zero_sock; + struct sockaddr_in6 *dst_addr6 = + (struct sockaddr_in6 *)dst_addr; + + src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id; + if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL) + id->route.addr.dev_addr.bound_dev_if = + dst_addr6->sin6_scope_id; + } else if (dst_addr->sa_family == AF_IB) { + ((struct sockaddr_ib *)&zero_sock)->sib_pkey = + ((struct sockaddr_ib *)dst_addr)->sib_pkey; + } + return rdma_bind_addr(id, (struct sockaddr *)&zero_sock); +} + +/* + * If required, resolve the source address for bind and leave the id_priv in + * state RDMA_CM_ADDR_BOUND. This oddly uses the state to determine the prior + * calls made by ULP, a previously bound ID will not be re-bound and src_addr is + * ignored. + */ +static int resolve_prepare_src(struct rdma_id_private *id_priv, + struct sockaddr *src_addr, + const struct sockaddr *dst_addr) +{ + int ret; + + memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr)); + if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY)) { + /* For a well behaved ULP state will be RDMA_CM_IDLE */ + ret = cma_bind_addr(&id_priv->id, src_addr, dst_addr); + if (ret) + goto err_dst; + if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, + RDMA_CM_ADDR_QUERY))) { + ret = -EINVAL; + goto err_dst; + } + } + + if (cma_family(id_priv) != dst_addr->sa_family) { + ret = -EINVAL; + goto err_state; + } + return 0; + +err_state: + cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND); +err_dst: + memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr)); + return ret; +} + +int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr, + const struct sockaddr *dst_addr, unsigned long timeout_ms) +{ + struct rdma_id_private *id_priv = + container_of(id, struct rdma_id_private, id); + int ret; + + ret = resolve_prepare_src(id_priv, src_addr, dst_addr); + if (ret) + return ret; + + if (cma_any_addr(dst_addr)) { + ret = cma_resolve_loopback(id_priv); + } else { + if (dst_addr->sa_family == AF_IB) { + ret = cma_resolve_ib_addr(id_priv); + } else { + /* + * The FSM can return back to RDMA_CM_ADDR_BOUND after + * rdma_resolve_ip() is called, eg through the error + * path in addr_handler(). If this happens the existing + * request must be canceled before issuing a new one. + * Since canceling a request is a bit slow and this + * oddball path is rare, keep track once a request has + * been issued. The track turns out to be a permanent + * state since this is the only cancel as it is + * immediately before rdma_resolve_ip(). + */ + if (id_priv->used_resolve_ip) + rdma_addr_cancel(&id->route.addr.dev_addr); + else + id_priv->used_resolve_ip = 1; + ret = rdma_resolve_ip(cma_src_addr(id_priv), dst_addr, + &id->route.addr.dev_addr, + timeout_ms, addr_handler, + false, id_priv); + } + } + if (ret) + goto err; + + return 0; +err: + cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND); + return ret; +} +EXPORT_SYMBOL(rdma_resolve_addr); + +int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse) +{ + struct rdma_id_private *id_priv; + unsigned long flags; + int ret; + + id_priv = container_of(id, struct rdma_id_private, id); + spin_lock_irqsave(&id_priv->lock, flags); + if ((reuse && id_priv->state != RDMA_CM_LISTEN) || + id_priv->state == RDMA_CM_IDLE) { + id_priv->reuseaddr = reuse; + ret = 0; + } else { + ret = -EINVAL; + } + spin_unlock_irqrestore(&id_priv->lock, flags); + return ret; +} +EXPORT_SYMBOL(rdma_set_reuseaddr); + +int rdma_set_afonly(struct rdma_cm_id *id, int afonly) +{ + struct rdma_id_private *id_priv; + unsigned long flags; + int ret; + + id_priv = container_of(id, struct rdma_id_private, id); + spin_lock_irqsave(&id_priv->lock, flags); + if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) { + id_priv->options |= (1 << CMA_OPTION_AFONLY); + id_priv->afonly = afonly; + ret = 0; + } else { + ret = -EINVAL; + } + spin_unlock_irqrestore(&id_priv->lock, flags); + return ret; +} +EXPORT_SYMBOL(rdma_set_afonly); + +static void cma_bind_port(struct rdma_bind_list *bind_list, + struct rdma_id_private *id_priv) +{ + struct sockaddr *addr; + struct sockaddr_ib *sib; + u64 sid, mask; + __be16 port; + + lockdep_assert_held(&lock); + + addr = cma_src_addr(id_priv); + port = htons(bind_list->port); + + switch (addr->sa_family) { + case AF_INET: + ((struct sockaddr_in *) addr)->sin_port = port; + break; + case AF_INET6: + ((struct sockaddr_in6 *) addr)->sin6_port = port; + break; + case AF_IB: + sib = (struct sockaddr_ib *) addr; + sid = be64_to_cpu(sib->sib_sid); + mask = be64_to_cpu(sib->sib_sid_mask); + sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port)); + sib->sib_sid_mask = cpu_to_be64(~0ULL); + break; + } + id_priv->bind_list = bind_list; + hlist_add_head(&id_priv->node, &bind_list->owners); +} + +static int cma_alloc_port(enum rdma_ucm_port_space ps, + struct rdma_id_private *id_priv, unsigned short snum) +{ + struct rdma_bind_list *bind_list; + int ret; + + lockdep_assert_held(&lock); + + bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL); + if (!bind_list) + return -ENOMEM; + + ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list, + snum); + if (ret < 0) + goto err; + + bind_list->ps = ps; + bind_list->port = snum; + cma_bind_port(bind_list, id_priv); + return 0; +err: + kfree(bind_list); + return ret == -ENOSPC ? -EADDRNOTAVAIL : ret; +} + +static int cma_port_is_unique(struct rdma_bind_list *bind_list, + struct rdma_id_private *id_priv) +{ + struct rdma_id_private *cur_id; + struct sockaddr *daddr = cma_dst_addr(id_priv); + struct sockaddr *saddr = cma_src_addr(id_priv); + __be16 dport = cma_port(daddr); + + lockdep_assert_held(&lock); + + hlist_for_each_entry(cur_id, &bind_list->owners, node) { + struct sockaddr *cur_daddr = cma_dst_addr(cur_id); + struct sockaddr *cur_saddr = cma_src_addr(cur_id); + __be16 cur_dport = cma_port(cur_daddr); + + if (id_priv == cur_id) + continue; + + /* different dest port -> unique */ + if (!cma_any_port(daddr) && + !cma_any_port(cur_daddr) && + (dport != cur_dport)) + continue; + + /* different src address -> unique */ + if (!cma_any_addr(saddr) && + !cma_any_addr(cur_saddr) && + cma_addr_cmp(saddr, cur_saddr)) + continue; + + /* different dst address -> unique */ + if (!cma_any_addr(daddr) && + !cma_any_addr(cur_daddr) && + cma_addr_cmp(daddr, cur_daddr)) + continue; + + return -EADDRNOTAVAIL; + } + return 0; +} + +static int cma_alloc_any_port(enum rdma_ucm_port_space ps, + struct rdma_id_private *id_priv) +{ + static unsigned int last_used_port; + int low, high, remaining; + unsigned int rover; + struct net *net = id_priv->id.route.addr.dev_addr.net; + + lockdep_assert_held(&lock); + + inet_get_local_port_range(net, &low, &high); + remaining = (high - low) + 1; + rover = prandom_u32_max(remaining) + low; +retry: + if (last_used_port != rover) { + struct rdma_bind_list *bind_list; + int ret; + + bind_list = cma_ps_find(net, ps, (unsigned short)rover); + + if (!bind_list) { + ret = cma_alloc_port(ps, id_priv, rover); + } else { + ret = cma_port_is_unique(bind_list, id_priv); + if (!ret) + cma_bind_port(bind_list, id_priv); + } + /* + * Remember previously used port number in order to avoid + * re-using same port immediately after it is closed. + */ + if (!ret) + last_used_port = rover; + if (ret != -EADDRNOTAVAIL) + return ret; + } + if (--remaining) { + rover++; + if ((rover < low) || (rover > high)) + rover = low; + goto retry; + } + return -EADDRNOTAVAIL; +} + +/* + * Check that the requested port is available. This is called when trying to + * bind to a specific port, or when trying to listen on a bound port. In + * the latter case, the provided id_priv may already be on the bind_list, but + * we still need to check that it's okay to start listening. + */ +static int cma_check_port(struct rdma_bind_list *bind_list, + struct rdma_id_private *id_priv, uint8_t reuseaddr) +{ + struct rdma_id_private *cur_id; + struct sockaddr *addr, *cur_addr; + + lockdep_assert_held(&lock); + + addr = cma_src_addr(id_priv); + hlist_for_each_entry(cur_id, &bind_list->owners, node) { + if (id_priv == cur_id) + continue; + + if (reuseaddr && cur_id->reuseaddr) + continue; + + cur_addr = cma_src_addr(cur_id); + if (id_priv->afonly && cur_id->afonly && + (addr->sa_family != cur_addr->sa_family)) + continue; + + if (cma_any_addr(addr) || cma_any_addr(cur_addr)) + return -EADDRNOTAVAIL; + + if (!cma_addr_cmp(addr, cur_addr)) + return -EADDRINUSE; + } + return 0; +} + +static int cma_use_port(enum rdma_ucm_port_space ps, + struct rdma_id_private *id_priv) +{ + struct rdma_bind_list *bind_list; + unsigned short snum; + int ret; + + lockdep_assert_held(&lock); + + snum = ntohs(cma_port(cma_src_addr(id_priv))); + if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) + return -EACCES; + + bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum); + if (!bind_list) { + ret = cma_alloc_port(ps, id_priv, snum); + } else { + ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr); + if (!ret) + cma_bind_port(bind_list, id_priv); + } + return ret; +} + +static enum rdma_ucm_port_space +cma_select_inet_ps(struct rdma_id_private *id_priv) +{ + switch (id_priv->id.ps) { + case RDMA_PS_TCP: + case RDMA_PS_UDP: + case RDMA_PS_IPOIB: + case RDMA_PS_IB: + return id_priv->id.ps; + default: + + return 0; + } +} + +static enum rdma_ucm_port_space +cma_select_ib_ps(struct rdma_id_private *id_priv) +{ + enum rdma_ucm_port_space ps = 0; + struct sockaddr_ib *sib; + u64 sid_ps, mask, sid; + + sib = (struct sockaddr_ib *) cma_src_addr(id_priv); + mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK; + sid = be64_to_cpu(sib->sib_sid) & mask; + + if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) { + sid_ps = RDMA_IB_IP_PS_IB; + ps = RDMA_PS_IB; + } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) && + (sid == (RDMA_IB_IP_PS_TCP & mask))) { + sid_ps = RDMA_IB_IP_PS_TCP; + ps = RDMA_PS_TCP; + } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) && + (sid == (RDMA_IB_IP_PS_UDP & mask))) { + sid_ps = RDMA_IB_IP_PS_UDP; + ps = RDMA_PS_UDP; + } + + if (ps) { + sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib))); + sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK | + be64_to_cpu(sib->sib_sid_mask)); + } + return ps; +} + +static int cma_get_port(struct rdma_id_private *id_priv) +{ + enum rdma_ucm_port_space ps; + int ret; + + if (cma_family(id_priv) != AF_IB) + ps = cma_select_inet_ps(id_priv); + else + ps = cma_select_ib_ps(id_priv); + if (!ps) + return -EPROTONOSUPPORT; + + mutex_lock(&lock); + if (cma_any_port(cma_src_addr(id_priv))) + ret = cma_alloc_any_port(ps, id_priv); + else + ret = cma_use_port(ps, id_priv); + mutex_unlock(&lock); + + return ret; +} + +static int cma_check_linklocal(struct rdma_dev_addr *dev_addr, + struct sockaddr *addr) +{ +#if IS_ENABLED(CONFIG_IPV6) + struct sockaddr_in6 *sin6; + + if (addr->sa_family != AF_INET6) + return 0; + + sin6 = (struct sockaddr_in6 *) addr; + + if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)) + return 0; + + if (!sin6->sin6_scope_id) + return -EINVAL; + + dev_addr->bound_dev_if = sin6->sin6_scope_id; +#endif + return 0; +} + +int rdma_listen(struct rdma_cm_id *id, int backlog) +{ + struct rdma_id_private *id_priv = + container_of(id, struct rdma_id_private, id); + int ret; + + if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN)) { + struct sockaddr_in any_in = { + .sin_family = AF_INET, + .sin_addr.s_addr = htonl(INADDR_ANY), + }; + + /* For a well behaved ULP state will be RDMA_CM_IDLE */ + ret = rdma_bind_addr(id, (struct sockaddr *)&any_in); + if (ret) + return ret; + if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, + RDMA_CM_LISTEN))) + return -EINVAL; + } + + /* + * Once the ID reaches RDMA_CM_LISTEN it is not allowed to be reusable + * any more, and has to be unique in the bind list. + */ + if (id_priv->reuseaddr) { + mutex_lock(&lock); + ret = cma_check_port(id_priv->bind_list, id_priv, 0); + if (!ret) + id_priv->reuseaddr = 0; + mutex_unlock(&lock); + if (ret) + goto err; + } + + id_priv->backlog = backlog; + if (id_priv->cma_dev) { + if (rdma_cap_ib_cm(id->device, 1)) { + ret = cma_ib_listen(id_priv); + if (ret) + goto err; + } else if (rdma_cap_iw_cm(id->device, 1)) { + ret = cma_iw_listen(id_priv, backlog); + if (ret) + goto err; + } else { + ret = -ENOSYS; + goto err; + } + } else { + ret = cma_listen_on_all(id_priv); + if (ret) + goto err; + } + + return 0; +err: + id_priv->backlog = 0; + /* + * All the failure paths that lead here will not allow the req_handler's + * to have run. + */ + cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND); + return ret; +} +EXPORT_SYMBOL(rdma_listen); + +int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr) +{ + struct rdma_id_private *id_priv; + int ret; + struct sockaddr *daddr; + + if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 && + addr->sa_family != AF_IB) + return -EAFNOSUPPORT; + + id_priv = container_of(id, struct rdma_id_private, id); + if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND)) + return -EINVAL; + + ret = cma_check_linklocal(&id->route.addr.dev_addr, addr); + if (ret) + goto err1; + + memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr)); + if (!cma_any_addr(addr)) { + ret = cma_translate_addr(addr, &id->route.addr.dev_addr); + if (ret) + goto err1; + + ret = cma_acquire_dev_by_src_ip(id_priv); + if (ret) + goto err1; + } + + if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) { + if (addr->sa_family == AF_INET) + id_priv->afonly = 1; +#if IS_ENABLED(CONFIG_IPV6) + else if (addr->sa_family == AF_INET6) { + struct net *net = id_priv->id.route.addr.dev_addr.net; + + id_priv->afonly = net->ipv6.sysctl.bindv6only; + } +#endif + } + daddr = cma_dst_addr(id_priv); + daddr->sa_family = addr->sa_family; + + ret = cma_get_port(id_priv); + if (ret) + goto err2; + + if (!cma_any_addr(addr)) + rdma_restrack_add(&id_priv->res); + return 0; +err2: + if (id_priv->cma_dev) + cma_release_dev(id_priv); +err1: + cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE); + return ret; +} +EXPORT_SYMBOL(rdma_bind_addr); + +static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv) +{ + struct cma_hdr *cma_hdr; + + cma_hdr = hdr; + cma_hdr->cma_version = CMA_VERSION; + if (cma_family(id_priv) == AF_INET) { + struct sockaddr_in *src4, *dst4; + + src4 = (struct sockaddr_in *) cma_src_addr(id_priv); + dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv); + + cma_set_ip_ver(cma_hdr, 4); + cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr; + cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr; + cma_hdr->port = src4->sin_port; + } else if (cma_family(id_priv) == AF_INET6) { + struct sockaddr_in6 *src6, *dst6; + + src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv); + dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv); + + cma_set_ip_ver(cma_hdr, 6); + cma_hdr->src_addr.ip6 = src6->sin6_addr; + cma_hdr->dst_addr.ip6 = dst6->sin6_addr; + cma_hdr->port = src6->sin6_port; + } + return 0; +} + +static int cma_sidr_rep_handler(struct ib_cm_id *cm_id, + const struct ib_cm_event *ib_event) +{ + struct rdma_id_private *id_priv = cm_id->context; + struct rdma_cm_event event = {}; + const struct ib_cm_sidr_rep_event_param *rep = + &ib_event->param.sidr_rep_rcvd; + int ret; + + mutex_lock(&id_priv->handler_mutex); + if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT) + goto out; + + switch (ib_event->event) { + case IB_CM_SIDR_REQ_ERROR: + event.event = RDMA_CM_EVENT_UNREACHABLE; + event.status = -ETIMEDOUT; + break; + case IB_CM_SIDR_REP_RECEIVED: + event.param.ud.private_data = ib_event->private_data; + event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE; + if (rep->status != IB_SIDR_SUCCESS) { + event.event = RDMA_CM_EVENT_UNREACHABLE; + event.status = ib_event->param.sidr_rep_rcvd.status; + pr_debug_ratelimited("RDMA CM: UNREACHABLE: bad SIDR reply. status %d\n", + event.status); + break; + } + ret = cma_set_qkey(id_priv, rep->qkey); + if (ret) { + pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to set qkey. status %d\n", ret); + event.event = RDMA_CM_EVENT_ADDR_ERROR; + event.status = ret; + break; + } + ib_init_ah_attr_from_path(id_priv->id.device, + id_priv->id.port_num, + id_priv->id.route.path_rec, + &event.param.ud.ah_attr, + rep->sgid_attr); + event.param.ud.qp_num = rep->qpn; + event.param.ud.qkey = rep->qkey; + event.event = RDMA_CM_EVENT_ESTABLISHED; + event.status = 0; + break; + default: + pr_err("RDMA CMA: unexpected IB CM event: %d\n", + ib_event->event); + goto out; + } + + ret = cma_cm_event_handler(id_priv, &event); + + rdma_destroy_ah_attr(&event.param.ud.ah_attr); + if (ret) { + /* Destroy the CM ID by returning a non-zero value. */ + id_priv->cm_id.ib = NULL; + destroy_id_handler_unlock(id_priv); + return ret; + } +out: + mutex_unlock(&id_priv->handler_mutex); + return 0; +} + +static int cma_resolve_ib_udp(struct rdma_id_private *id_priv, + struct rdma_conn_param *conn_param) +{ + struct ib_cm_sidr_req_param req; + struct ib_cm_id *id; + void *private_data; + u8 offset; + int ret; + + memset(&req, 0, sizeof req); + offset = cma_user_data_offset(id_priv); + if (check_add_overflow(offset, conn_param->private_data_len, &req.private_data_len)) + return -EINVAL; + + if (req.private_data_len) { + private_data = kzalloc(req.private_data_len, GFP_ATOMIC); + if (!private_data) + return -ENOMEM; + } else { + private_data = NULL; + } + + if (conn_param->private_data && conn_param->private_data_len) + memcpy(private_data + offset, conn_param->private_data, + conn_param->private_data_len); + + if (private_data) { + ret = cma_format_hdr(private_data, id_priv); + if (ret) + goto out; + req.private_data = private_data; + } + + id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler, + id_priv); + if (IS_ERR(id)) { + ret = PTR_ERR(id); + goto out; + } + id_priv->cm_id.ib = id; + + req.path = id_priv->id.route.path_rec; + req.sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr; + req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv)); + req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8); + req.max_cm_retries = CMA_MAX_CM_RETRIES; + + trace_cm_send_sidr_req(id_priv); + ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req); + if (ret) { + ib_destroy_cm_id(id_priv->cm_id.ib); + id_priv->cm_id.ib = NULL; + } +out: + kfree(private_data); + return ret; +} + +static int cma_connect_ib(struct rdma_id_private *id_priv, + struct rdma_conn_param *conn_param) +{ + struct ib_cm_req_param req; + struct rdma_route *route; + void *private_data; + struct ib_cm_id *id; + u8 offset; + int ret; + + memset(&req, 0, sizeof req); + offset = cma_user_data_offset(id_priv); + if (check_add_overflow(offset, conn_param->private_data_len, &req.private_data_len)) + return -EINVAL; + + if (req.private_data_len) { + private_data = kzalloc(req.private_data_len, GFP_ATOMIC); + if (!private_data) + return -ENOMEM; + } else { + private_data = NULL; + } + + if (conn_param->private_data && conn_param->private_data_len) + memcpy(private_data + offset, conn_param->private_data, + conn_param->private_data_len); + + id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv); + if (IS_ERR(id)) { + ret = PTR_ERR(id); + goto out; + } + id_priv->cm_id.ib = id; + + route = &id_priv->id.route; + if (private_data) { + ret = cma_format_hdr(private_data, id_priv); + if (ret) + goto out; + req.private_data = private_data; + } + + req.primary_path = &route->path_rec[0]; + req.primary_path_inbound = route->path_rec_inbound; + req.primary_path_outbound = route->path_rec_outbound; + if (route->num_pri_alt_paths == 2) + req.alternate_path = &route->path_rec[1]; + + req.ppath_sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr; + /* Alternate path SGID attribute currently unsupported */ + req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv)); + req.qp_num = id_priv->qp_num; + req.qp_type = id_priv->id.qp_type; + req.starting_psn = id_priv->seq_num; + req.responder_resources = conn_param->responder_resources; + req.initiator_depth = conn_param->initiator_depth; + req.flow_control = conn_param->flow_control; + req.retry_count = min_t(u8, 7, conn_param->retry_count); + req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count); + req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT; + req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT; + req.max_cm_retries = CMA_MAX_CM_RETRIES; + req.srq = id_priv->srq ? 1 : 0; + req.ece.vendor_id = id_priv->ece.vendor_id; + req.ece.attr_mod = id_priv->ece.attr_mod; + + trace_cm_send_req(id_priv); + ret = ib_send_cm_req(id_priv->cm_id.ib, &req); +out: + if (ret && !IS_ERR(id)) { + ib_destroy_cm_id(id); + id_priv->cm_id.ib = NULL; + } + + kfree(private_data); + return ret; +} + +static int cma_connect_iw(struct rdma_id_private *id_priv, + struct rdma_conn_param *conn_param) +{ + struct iw_cm_id *cm_id; + int ret; + struct iw_cm_conn_param iw_param; + + cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv); + if (IS_ERR(cm_id)) + return PTR_ERR(cm_id); + + mutex_lock(&id_priv->qp_mutex); + cm_id->tos = id_priv->tos; + cm_id->tos_set = id_priv->tos_set; + mutex_unlock(&id_priv->qp_mutex); + + id_priv->cm_id.iw = cm_id; + + memcpy(&cm_id->local_addr, cma_src_addr(id_priv), + rdma_addr_size(cma_src_addr(id_priv))); + memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv), + rdma_addr_size(cma_dst_addr(id_priv))); + + ret = cma_modify_qp_rtr(id_priv, conn_param); + if (ret) + goto out; + + if (conn_param) { + iw_param.ord = conn_param->initiator_depth; + iw_param.ird = conn_param->responder_resources; + iw_param.private_data = conn_param->private_data; + iw_param.private_data_len = conn_param->private_data_len; + iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num; + } else { + memset(&iw_param, 0, sizeof iw_param); + iw_param.qpn = id_priv->qp_num; + } + ret = iw_cm_connect(cm_id, &iw_param); +out: + if (ret) { + iw_destroy_cm_id(cm_id); + id_priv->cm_id.iw = NULL; + } + return ret; +} + +/** + * rdma_connect_locked - Initiate an active connection request. + * @id: Connection identifier to connect. + * @conn_param: Connection information used for connected QPs. + * + * Same as rdma_connect() but can only be called from the + * RDMA_CM_EVENT_ROUTE_RESOLVED handler callback. + */ +int rdma_connect_locked(struct rdma_cm_id *id, + struct rdma_conn_param *conn_param) +{ + struct rdma_id_private *id_priv = + container_of(id, struct rdma_id_private, id); + int ret; + + if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT)) + return -EINVAL; + + if (!id->qp) { + id_priv->qp_num = conn_param->qp_num; + id_priv->srq = conn_param->srq; + } + + if (rdma_cap_ib_cm(id->device, id->port_num)) { + if (id->qp_type == IB_QPT_UD) + ret = cma_resolve_ib_udp(id_priv, conn_param); + else + ret = cma_connect_ib(id_priv, conn_param); + } else if (rdma_cap_iw_cm(id->device, id->port_num)) { + ret = cma_connect_iw(id_priv, conn_param); + } else { + ret = -ENOSYS; + } + if (ret) + goto err_state; + return 0; +err_state: + cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED); + return ret; +} +EXPORT_SYMBOL(rdma_connect_locked); + +/** + * rdma_connect - Initiate an active connection request. + * @id: Connection identifier to connect. + * @conn_param: Connection information used for connected QPs. + * + * Users must have resolved a route for the rdma_cm_id to connect with by having + * called rdma_resolve_route before calling this routine. + * + * This call will either connect to a remote QP or obtain remote QP information + * for unconnected rdma_cm_id's. The actual operation is based on the + * rdma_cm_id's port space. + */ +int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) +{ + struct rdma_id_private *id_priv = + container_of(id, struct rdma_id_private, id); + int ret; + + mutex_lock(&id_priv->handler_mutex); + ret = rdma_connect_locked(id, conn_param); + mutex_unlock(&id_priv->handler_mutex); + return ret; +} +EXPORT_SYMBOL(rdma_connect); + +/** + * rdma_connect_ece - Initiate an active connection request with ECE data. + * @id: Connection identifier to connect. + * @conn_param: Connection information used for connected QPs. + * @ece: ECE parameters + * + * See rdma_connect() explanation. + */ +int rdma_connect_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param, + struct rdma_ucm_ece *ece) +{ + struct rdma_id_private *id_priv = + container_of(id, struct rdma_id_private, id); + + id_priv->ece.vendor_id = ece->vendor_id; + id_priv->ece.attr_mod = ece->attr_mod; + + return rdma_connect(id, conn_param); +} +EXPORT_SYMBOL(rdma_connect_ece); + +static int cma_accept_ib(struct rdma_id_private *id_priv, + struct rdma_conn_param *conn_param) +{ + struct ib_cm_rep_param rep; + int ret; + + ret = cma_modify_qp_rtr(id_priv, conn_param); + if (ret) + goto out; + + ret = cma_modify_qp_rts(id_priv, conn_param); + if (ret) + goto out; + + memset(&rep, 0, sizeof rep); + rep.qp_num = id_priv->qp_num; + rep.starting_psn = id_priv->seq_num; + rep.private_data = conn_param->private_data; + rep.private_data_len = conn_param->private_data_len; + rep.responder_resources = conn_param->responder_resources; + rep.initiator_depth = conn_param->initiator_depth; + rep.failover_accepted = 0; + rep.flow_control = conn_param->flow_control; + rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count); + rep.srq = id_priv->srq ? 1 : 0; + rep.ece.vendor_id = id_priv->ece.vendor_id; + rep.ece.attr_mod = id_priv->ece.attr_mod; + + trace_cm_send_rep(id_priv); + ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep); +out: + return ret; +} + +static int cma_accept_iw(struct rdma_id_private *id_priv, + struct rdma_conn_param *conn_param) +{ + struct iw_cm_conn_param iw_param; + int ret; + + if (!conn_param) + return -EINVAL; + + ret = cma_modify_qp_rtr(id_priv, conn_param); + if (ret) + return ret; + + iw_param.ord = conn_param->initiator_depth; + iw_param.ird = conn_param->responder_resources; + iw_param.private_data = conn_param->private_data; + iw_param.private_data_len = conn_param->private_data_len; + if (id_priv->id.qp) + iw_param.qpn = id_priv->qp_num; + else + iw_param.qpn = conn_param->qp_num; + + return iw_cm_accept(id_priv->cm_id.iw, &iw_param); +} + +static int cma_send_sidr_rep(struct rdma_id_private *id_priv, + enum ib_cm_sidr_status status, u32 qkey, + const void *private_data, int private_data_len) +{ + struct ib_cm_sidr_rep_param rep; + int ret; + + memset(&rep, 0, sizeof rep); + rep.status = status; + if (status == IB_SIDR_SUCCESS) { + if (qkey) + ret = cma_set_qkey(id_priv, qkey); + else + ret = cma_set_default_qkey(id_priv); + if (ret) + return ret; + rep.qp_num = id_priv->qp_num; + rep.qkey = id_priv->qkey; + + rep.ece.vendor_id = id_priv->ece.vendor_id; + rep.ece.attr_mod = id_priv->ece.attr_mod; + } + + rep.private_data = private_data; + rep.private_data_len = private_data_len; + + trace_cm_send_sidr_rep(id_priv); + return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep); +} + +/** + * rdma_accept - Called to accept a connection request or response. + * @id: Connection identifier associated with the request. + * @conn_param: Information needed to establish the connection. This must be + * provided if accepting a connection request. If accepting a connection + * response, this parameter must be NULL. + * + * Typically, this routine is only called by the listener to accept a connection + * request. It must also be called on the active side of a connection if the + * user is performing their own QP transitions. + * + * In the case of error, a reject message is sent to the remote side and the + * state of the qp associated with the id is modified to error, such that any + * previously posted receive buffers would be flushed. + * + * This function is for use by kernel ULPs and must be called from under the + * handler callback. + */ +int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) +{ + struct rdma_id_private *id_priv = + container_of(id, struct rdma_id_private, id); + int ret; + + lockdep_assert_held(&id_priv->handler_mutex); + + if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT) + return -EINVAL; + + if (!id->qp && conn_param) { + id_priv->qp_num = conn_param->qp_num; + id_priv->srq = conn_param->srq; + } + + if (rdma_cap_ib_cm(id->device, id->port_num)) { + if (id->qp_type == IB_QPT_UD) { + if (conn_param) + ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS, + conn_param->qkey, + conn_param->private_data, + conn_param->private_data_len); + else + ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS, + 0, NULL, 0); + } else { + if (conn_param) + ret = cma_accept_ib(id_priv, conn_param); + else + ret = cma_rep_recv(id_priv); + } + } else if (rdma_cap_iw_cm(id->device, id->port_num)) { + ret = cma_accept_iw(id_priv, conn_param); + } else { + ret = -ENOSYS; + } + if (ret) + goto reject; + + return 0; +reject: + cma_modify_qp_err(id_priv); + rdma_reject(id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED); + return ret; +} +EXPORT_SYMBOL(rdma_accept); + +int rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param, + struct rdma_ucm_ece *ece) +{ + struct rdma_id_private *id_priv = + container_of(id, struct rdma_id_private, id); + + id_priv->ece.vendor_id = ece->vendor_id; + id_priv->ece.attr_mod = ece->attr_mod; + + return rdma_accept(id, conn_param); +} +EXPORT_SYMBOL(rdma_accept_ece); + +void rdma_lock_handler(struct rdma_cm_id *id) +{ + struct rdma_id_private *id_priv = + container_of(id, struct rdma_id_private, id); + + mutex_lock(&id_priv->handler_mutex); +} +EXPORT_SYMBOL(rdma_lock_handler); + +void rdma_unlock_handler(struct rdma_cm_id *id) +{ + struct rdma_id_private *id_priv = + container_of(id, struct rdma_id_private, id); + + mutex_unlock(&id_priv->handler_mutex); +} +EXPORT_SYMBOL(rdma_unlock_handler); + +int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event) +{ + struct rdma_id_private *id_priv; + int ret; + + id_priv = container_of(id, struct rdma_id_private, id); + if (!id_priv->cm_id.ib) + return -EINVAL; + + switch (id->device->node_type) { + case RDMA_NODE_IB_CA: + ret = ib_cm_notify(id_priv->cm_id.ib, event); + break; + default: + ret = 0; + break; + } + return ret; +} +EXPORT_SYMBOL(rdma_notify); + +int rdma_reject(struct rdma_cm_id *id, const void *private_data, + u8 private_data_len, u8 reason) +{ + struct rdma_id_private *id_priv; + int ret; + + id_priv = container_of(id, struct rdma_id_private, id); + if (!id_priv->cm_id.ib) + return -EINVAL; + + if (rdma_cap_ib_cm(id->device, id->port_num)) { + if (id->qp_type == IB_QPT_UD) { + ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0, + private_data, private_data_len); + } else { + trace_cm_send_rej(id_priv); + ret = ib_send_cm_rej(id_priv->cm_id.ib, reason, NULL, 0, + private_data, private_data_len); + } + } else if (rdma_cap_iw_cm(id->device, id->port_num)) { + ret = iw_cm_reject(id_priv->cm_id.iw, + private_data, private_data_len); + } else { + ret = -ENOSYS; + } + + return ret; +} +EXPORT_SYMBOL(rdma_reject); + +int rdma_disconnect(struct rdma_cm_id *id) +{ + struct rdma_id_private *id_priv; + int ret; + + id_priv = container_of(id, struct rdma_id_private, id); + if (!id_priv->cm_id.ib) + return -EINVAL; + + if (rdma_cap_ib_cm(id->device, id->port_num)) { + ret = cma_modify_qp_err(id_priv); + if (ret) + goto out; + /* Initiate or respond to a disconnect. */ + trace_cm_disconnect(id_priv); + if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) { + if (!ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0)) + trace_cm_sent_drep(id_priv); + } else { + trace_cm_sent_dreq(id_priv); + } + } else if (rdma_cap_iw_cm(id->device, id->port_num)) { + ret = iw_cm_disconnect(id_priv->cm_id.iw, 0); + } else + ret = -EINVAL; + +out: + return ret; +} +EXPORT_SYMBOL(rdma_disconnect); + +static void cma_make_mc_event(int status, struct rdma_id_private *id_priv, + struct ib_sa_multicast *multicast, + struct rdma_cm_event *event, + struct cma_multicast *mc) +{ + struct rdma_dev_addr *dev_addr; + enum ib_gid_type gid_type; + struct net_device *ndev; + + if (status) + pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n", + status); + + event->status = status; + event->param.ud.private_data = mc->context; + if (status) { + event->event = RDMA_CM_EVENT_MULTICAST_ERROR; + return; + } + + dev_addr = &id_priv->id.route.addr.dev_addr; + ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if); + gid_type = + id_priv->cma_dev + ->default_gid_type[id_priv->id.port_num - + rdma_start_port( + id_priv->cma_dev->device)]; + + event->event = RDMA_CM_EVENT_MULTICAST_JOIN; + if (ib_init_ah_from_mcmember(id_priv->id.device, id_priv->id.port_num, + &multicast->rec, ndev, gid_type, + &event->param.ud.ah_attr)) { + event->event = RDMA_CM_EVENT_MULTICAST_ERROR; + goto out; + } + + event->param.ud.qp_num = 0xFFFFFF; + event->param.ud.qkey = id_priv->qkey; + +out: + if (ndev) + dev_put(ndev); +} + +static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast) +{ + struct cma_multicast *mc = multicast->context; + struct rdma_id_private *id_priv = mc->id_priv; + struct rdma_cm_event event = {}; + int ret = 0; + + mutex_lock(&id_priv->handler_mutex); + if (READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL || + READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING) + goto out; + + ret = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey)); + if (!ret) { + cma_make_mc_event(status, id_priv, multicast, &event, mc); + ret = cma_cm_event_handler(id_priv, &event); + } + rdma_destroy_ah_attr(&event.param.ud.ah_attr); + WARN_ON(ret); + +out: + mutex_unlock(&id_priv->handler_mutex); + return 0; +} + +static void cma_set_mgid(struct rdma_id_private *id_priv, + struct sockaddr *addr, union ib_gid *mgid) +{ + unsigned char mc_map[MAX_ADDR_LEN]; + struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; + struct sockaddr_in *sin = (struct sockaddr_in *) addr; + struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr; + + if (cma_any_addr(addr)) { + memset(mgid, 0, sizeof *mgid); + } else if ((addr->sa_family == AF_INET6) && + ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) == + 0xFF10A01B)) { + /* IPv6 address is an SA assigned MGID. */ + memcpy(mgid, &sin6->sin6_addr, sizeof *mgid); + } else if (addr->sa_family == AF_IB) { + memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid); + } else if (addr->sa_family == AF_INET6) { + ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map); + if (id_priv->id.ps == RDMA_PS_UDP) + mc_map[7] = 0x01; /* Use RDMA CM signature */ + *mgid = *(union ib_gid *) (mc_map + 4); + } else { + ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map); + if (id_priv->id.ps == RDMA_PS_UDP) + mc_map[7] = 0x01; /* Use RDMA CM signature */ + *mgid = *(union ib_gid *) (mc_map + 4); + } +} + +static int cma_join_ib_multicast(struct rdma_id_private *id_priv, + struct cma_multicast *mc) +{ + struct ib_sa_mcmember_rec rec; + struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; + ib_sa_comp_mask comp_mask; + int ret; + + ib_addr_get_mgid(dev_addr, &rec.mgid); + ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num, + &rec.mgid, &rec); + if (ret) + return ret; + + if (!id_priv->qkey) { + ret = cma_set_default_qkey(id_priv); + if (ret) + return ret; + } + + cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid); + rec.qkey = cpu_to_be32(id_priv->qkey); + rdma_addr_get_sgid(dev_addr, &rec.port_gid); + rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr)); + rec.join_state = mc->join_state; + + comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID | + IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE | + IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL | + IB_SA_MCMEMBER_REC_FLOW_LABEL | + IB_SA_MCMEMBER_REC_TRAFFIC_CLASS; + + if (id_priv->id.ps == RDMA_PS_IPOIB) + comp_mask |= IB_SA_MCMEMBER_REC_RATE | + IB_SA_MCMEMBER_REC_RATE_SELECTOR | + IB_SA_MCMEMBER_REC_MTU_SELECTOR | + IB_SA_MCMEMBER_REC_MTU | + IB_SA_MCMEMBER_REC_HOP_LIMIT; + + mc->sa_mc = ib_sa_join_multicast(&sa_client, id_priv->id.device, + id_priv->id.port_num, &rec, comp_mask, + GFP_KERNEL, cma_ib_mc_handler, mc); + return PTR_ERR_OR_ZERO(mc->sa_mc); +} + +static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid, + enum ib_gid_type gid_type) +{ + struct sockaddr_in *sin = (struct sockaddr_in *)addr; + struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr; + + if (cma_any_addr(addr)) { + memset(mgid, 0, sizeof *mgid); + } else if (addr->sa_family == AF_INET6) { + memcpy(mgid, &sin6->sin6_addr, sizeof *mgid); + } else { + mgid->raw[0] = + (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0xff; + mgid->raw[1] = + (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0x0e; + mgid->raw[2] = 0; + mgid->raw[3] = 0; + mgid->raw[4] = 0; + mgid->raw[5] = 0; + mgid->raw[6] = 0; + mgid->raw[7] = 0; + mgid->raw[8] = 0; + mgid->raw[9] = 0; + mgid->raw[10] = 0xff; + mgid->raw[11] = 0xff; + *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr; + } +} + +static int cma_iboe_join_multicast(struct rdma_id_private *id_priv, + struct cma_multicast *mc) +{ + struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; + int err = 0; + struct sockaddr *addr = (struct sockaddr *)&mc->addr; + struct net_device *ndev = NULL; + struct ib_sa_multicast ib = {}; + enum ib_gid_type gid_type; + bool send_only; + + send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN); + + if (cma_zero_addr(addr)) + return -EINVAL; + + gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num - + rdma_start_port(id_priv->cma_dev->device)]; + cma_iboe_set_mgid(addr, &ib.rec.mgid, gid_type); + + ib.rec.pkey = cpu_to_be16(0xffff); + if (dev_addr->bound_dev_if) + ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if); + if (!ndev) + return -ENODEV; + + ib.rec.rate = IB_RATE_PORT_CURRENT; + ib.rec.hop_limit = 1; + ib.rec.mtu = iboe_get_mtu(ndev->mtu); + + if (addr->sa_family == AF_INET) { + if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) { + ib.rec.hop_limit = IPV6_DEFAULT_HOPLIMIT; + if (!send_only) { + err = cma_igmp_send(ndev, &ib.rec.mgid, + true); + } + } + } else { + if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) + err = -ENOTSUPP; + } + dev_put(ndev); + if (err || !ib.rec.mtu) + return err ?: -EINVAL; + + if (!id_priv->qkey) + cma_set_default_qkey(id_priv); + + rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr, + &ib.rec.port_gid); + INIT_WORK(&mc->iboe_join.work, cma_iboe_join_work_handler); + cma_make_mc_event(0, id_priv, &ib, &mc->iboe_join.event, mc); + queue_work(cma_wq, &mc->iboe_join.work); + return 0; +} + +int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr, + u8 join_state, void *context) +{ + struct rdma_id_private *id_priv = + container_of(id, struct rdma_id_private, id); + struct cma_multicast *mc; + int ret; + + /* Not supported for kernel QPs */ + if (WARN_ON(id->qp)) + return -EINVAL; + + /* ULP is calling this wrong. */ + if (!id->device || (READ_ONCE(id_priv->state) != RDMA_CM_ADDR_BOUND && + READ_ONCE(id_priv->state) != RDMA_CM_ADDR_RESOLVED)) + return -EINVAL; + + if (id_priv->id.qp_type != IB_QPT_UD) + return -EINVAL; + + mc = kzalloc(sizeof(*mc), GFP_KERNEL); + if (!mc) + return -ENOMEM; + + memcpy(&mc->addr, addr, rdma_addr_size(addr)); + mc->context = context; + mc->id_priv = id_priv; + mc->join_state = join_state; + + if (rdma_protocol_roce(id->device, id->port_num)) { + ret = cma_iboe_join_multicast(id_priv, mc); + if (ret) + goto out_err; + } else if (rdma_cap_ib_mcast(id->device, id->port_num)) { + ret = cma_join_ib_multicast(id_priv, mc); + if (ret) + goto out_err; + } else { + ret = -ENOSYS; + goto out_err; + } + + spin_lock(&id_priv->lock); + list_add(&mc->list, &id_priv->mc_list); + spin_unlock(&id_priv->lock); + + return 0; +out_err: + kfree(mc); + return ret; +} +EXPORT_SYMBOL(rdma_join_multicast); + +void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr) +{ + struct rdma_id_private *id_priv; + struct cma_multicast *mc; + + id_priv = container_of(id, struct rdma_id_private, id); + spin_lock_irq(&id_priv->lock); + list_for_each_entry(mc, &id_priv->mc_list, list) { + if (memcmp(&mc->addr, addr, rdma_addr_size(addr)) != 0) + continue; + list_del(&mc->list); + spin_unlock_irq(&id_priv->lock); + + WARN_ON(id_priv->cma_dev->device != id->device); + destroy_mc(id_priv, mc); + return; + } + spin_unlock_irq(&id_priv->lock); +} +EXPORT_SYMBOL(rdma_leave_multicast); + +static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv) +{ + struct rdma_dev_addr *dev_addr; + struct cma_work *work; + + dev_addr = &id_priv->id.route.addr.dev_addr; + + if ((dev_addr->bound_dev_if == ndev->ifindex) && + (net_eq(dev_net(ndev), dev_addr->net)) && + memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) { + pr_info("RDMA CM addr change for ndev %s used by id %p\n", + ndev->name, &id_priv->id); + work = kzalloc(sizeof *work, GFP_KERNEL); + if (!work) + return -ENOMEM; + + INIT_WORK(&work->work, cma_work_handler); + work->id = id_priv; + work->event.event = RDMA_CM_EVENT_ADDR_CHANGE; + cma_id_get(id_priv); + queue_work(cma_wq, &work->work); + } + + return 0; +} + +static int cma_netdev_callback(struct notifier_block *self, unsigned long event, + void *ptr) +{ + struct net_device *ndev = netdev_notifier_info_to_dev(ptr); + struct cma_device *cma_dev; + struct rdma_id_private *id_priv; + int ret = NOTIFY_DONE; + + if (event != NETDEV_BONDING_FAILOVER) + return NOTIFY_DONE; + + if (!netif_is_bond_master(ndev)) + return NOTIFY_DONE; + + mutex_lock(&lock); + list_for_each_entry(cma_dev, &dev_list, list) + list_for_each_entry(id_priv, &cma_dev->id_list, device_item) { + ret = cma_netdev_change(ndev, id_priv); + if (ret) + goto out; + } + +out: + mutex_unlock(&lock); + return ret; +} + +static void cma_netevent_work_handler(struct work_struct *_work) +{ + struct rdma_id_private *id_priv = + container_of(_work, struct rdma_id_private, id.net_work); + struct rdma_cm_event event = {}; + + mutex_lock(&id_priv->handler_mutex); + + if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING || + READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL) + goto out_unlock; + + event.event = RDMA_CM_EVENT_UNREACHABLE; + event.status = -ETIMEDOUT; + + if (cma_cm_event_handler(id_priv, &event)) { + __acquire(&id_priv->handler_mutex); + id_priv->cm_id.ib = NULL; + cma_id_put(id_priv); + destroy_id_handler_unlock(id_priv); + return; + } + +out_unlock: + mutex_unlock(&id_priv->handler_mutex); + cma_id_put(id_priv); +} + +static int cma_netevent_callback(struct notifier_block *self, + unsigned long event, void *ctx) +{ + struct id_table_entry *ips_node = NULL; + struct rdma_id_private *current_id; + struct neighbour *neigh = ctx; + unsigned long flags; + + if (event != NETEVENT_NEIGH_UPDATE) + return NOTIFY_DONE; + + spin_lock_irqsave(&id_table_lock, flags); + if (neigh->tbl->family == AF_INET6) { + struct sockaddr_in6 neigh_sock_6; + + neigh_sock_6.sin6_family = AF_INET6; + neigh_sock_6.sin6_addr = *(struct in6_addr *)neigh->primary_key; + ips_node = node_from_ndev_ip(&id_table, neigh->dev->ifindex, + (struct sockaddr *)&neigh_sock_6); + } else if (neigh->tbl->family == AF_INET) { + struct sockaddr_in neigh_sock_4; + + neigh_sock_4.sin_family = AF_INET; + neigh_sock_4.sin_addr.s_addr = *(__be32 *)(neigh->primary_key); + ips_node = node_from_ndev_ip(&id_table, neigh->dev->ifindex, + (struct sockaddr *)&neigh_sock_4); + } else + goto out; + + if (!ips_node) + goto out; + + list_for_each_entry(current_id, &ips_node->id_list, id_list_entry) { + if (!memcmp(current_id->id.route.addr.dev_addr.dst_dev_addr, + neigh->ha, ETH_ALEN)) + continue; + INIT_WORK(¤t_id->id.net_work, cma_netevent_work_handler); + cma_id_get(current_id); + queue_work(cma_wq, ¤t_id->id.net_work); + } +out: + spin_unlock_irqrestore(&id_table_lock, flags); + return NOTIFY_DONE; +} + +static struct notifier_block cma_nb = { + .notifier_call = cma_netdev_callback +}; + +static struct notifier_block cma_netevent_cb = { + .notifier_call = cma_netevent_callback +}; + +static void cma_send_device_removal_put(struct rdma_id_private *id_priv) +{ + struct rdma_cm_event event = { .event = RDMA_CM_EVENT_DEVICE_REMOVAL }; + enum rdma_cm_state state; + unsigned long flags; + + mutex_lock(&id_priv->handler_mutex); + /* Record that we want to remove the device */ + spin_lock_irqsave(&id_priv->lock, flags); + state = id_priv->state; + if (state == RDMA_CM_DESTROYING || state == RDMA_CM_DEVICE_REMOVAL) { + spin_unlock_irqrestore(&id_priv->lock, flags); + mutex_unlock(&id_priv->handler_mutex); + cma_id_put(id_priv); + return; + } + id_priv->state = RDMA_CM_DEVICE_REMOVAL; + spin_unlock_irqrestore(&id_priv->lock, flags); + + if (cma_cm_event_handler(id_priv, &event)) { + /* + * At this point the ULP promises it won't call + * rdma_destroy_id() concurrently + */ + cma_id_put(id_priv); + mutex_unlock(&id_priv->handler_mutex); + trace_cm_id_destroy(id_priv); + _destroy_id(id_priv, state); + return; + } + mutex_unlock(&id_priv->handler_mutex); + + /* + * If this races with destroy then the thread that first assigns state + * to a destroying does the cancel. + */ + cma_cancel_operation(id_priv, state); + cma_id_put(id_priv); +} + +static void cma_process_remove(struct cma_device *cma_dev) +{ + mutex_lock(&lock); + while (!list_empty(&cma_dev->id_list)) { + struct rdma_id_private *id_priv = list_first_entry( + &cma_dev->id_list, struct rdma_id_private, device_item); + + list_del_init(&id_priv->listen_item); + list_del_init(&id_priv->device_item); + cma_id_get(id_priv); + mutex_unlock(&lock); + + cma_send_device_removal_put(id_priv); + + mutex_lock(&lock); + } + mutex_unlock(&lock); + + cma_dev_put(cma_dev); + wait_for_completion(&cma_dev->comp); +} + +static bool cma_supported(struct ib_device *device) +{ + u32 i; + + rdma_for_each_port(device, i) { + if (rdma_cap_ib_cm(device, i) || rdma_cap_iw_cm(device, i)) + return true; + } + return false; +} + +static int cma_add_one(struct ib_device *device) +{ + struct rdma_id_private *to_destroy; + struct cma_device *cma_dev; + struct rdma_id_private *id_priv; + unsigned long supported_gids = 0; + int ret; + u32 i; + + if (!cma_supported(device)) + return -EOPNOTSUPP; + + cma_dev = kmalloc(sizeof(*cma_dev), GFP_KERNEL); + if (!cma_dev) + return -ENOMEM; + + cma_dev->device = device; + cma_dev->default_gid_type = kcalloc(device->phys_port_cnt, + sizeof(*cma_dev->default_gid_type), + GFP_KERNEL); + if (!cma_dev->default_gid_type) { + ret = -ENOMEM; + goto free_cma_dev; + } + + cma_dev->default_roce_tos = kcalloc(device->phys_port_cnt, + sizeof(*cma_dev->default_roce_tos), + GFP_KERNEL); + if (!cma_dev->default_roce_tos) { + ret = -ENOMEM; + goto free_gid_type; + } + + rdma_for_each_port (device, i) { + supported_gids = roce_gid_type_mask_support(device, i); + WARN_ON(!supported_gids); + if (supported_gids & (1 << CMA_PREFERRED_ROCE_GID_TYPE)) + cma_dev->default_gid_type[i - rdma_start_port(device)] = + CMA_PREFERRED_ROCE_GID_TYPE; + else + cma_dev->default_gid_type[i - rdma_start_port(device)] = + find_first_bit(&supported_gids, BITS_PER_LONG); + cma_dev->default_roce_tos[i - rdma_start_port(device)] = 0; + } + + init_completion(&cma_dev->comp); + refcount_set(&cma_dev->refcount, 1); + INIT_LIST_HEAD(&cma_dev->id_list); + ib_set_client_data(device, &cma_client, cma_dev); + + mutex_lock(&lock); + list_add_tail(&cma_dev->list, &dev_list); + list_for_each_entry(id_priv, &listen_any_list, listen_any_item) { + ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy); + if (ret) + goto free_listen; + } + mutex_unlock(&lock); + + trace_cm_add_one(device); + return 0; + +free_listen: + list_del(&cma_dev->list); + mutex_unlock(&lock); + + /* cma_process_remove() will delete to_destroy */ + cma_process_remove(cma_dev); + kfree(cma_dev->default_roce_tos); +free_gid_type: + kfree(cma_dev->default_gid_type); + +free_cma_dev: + kfree(cma_dev); + return ret; +} + +static void cma_remove_one(struct ib_device *device, void *client_data) +{ + struct cma_device *cma_dev = client_data; + + trace_cm_remove_one(device); + + mutex_lock(&lock); + list_del(&cma_dev->list); + mutex_unlock(&lock); + + cma_process_remove(cma_dev); + kfree(cma_dev->default_roce_tos); + kfree(cma_dev->default_gid_type); + kfree(cma_dev); +} + +static int cma_init_net(struct net *net) +{ + struct cma_pernet *pernet = cma_pernet(net); + + xa_init(&pernet->tcp_ps); + xa_init(&pernet->udp_ps); + xa_init(&pernet->ipoib_ps); + xa_init(&pernet->ib_ps); + + return 0; +} + +static void cma_exit_net(struct net *net) +{ + struct cma_pernet *pernet = cma_pernet(net); + + WARN_ON(!xa_empty(&pernet->tcp_ps)); + WARN_ON(!xa_empty(&pernet->udp_ps)); + WARN_ON(!xa_empty(&pernet->ipoib_ps)); + WARN_ON(!xa_empty(&pernet->ib_ps)); +} + +static struct pernet_operations cma_pernet_operations = { + .init = cma_init_net, + .exit = cma_exit_net, + .id = &cma_pernet_id, + .size = sizeof(struct cma_pernet), +}; + +static int __init cma_init(void) +{ + int ret; + + /* + * There is a rare lock ordering dependency in cma_netdev_callback() + * that only happens when bonding is enabled. Teach lockdep that rtnl + * must never be nested under lock so it can find these without having + * to test with bonding. + */ + if (IS_ENABLED(CONFIG_LOCKDEP)) { + rtnl_lock(); + mutex_lock(&lock); + mutex_unlock(&lock); + rtnl_unlock(); + } + + cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM); + if (!cma_wq) + return -ENOMEM; + + ret = register_pernet_subsys(&cma_pernet_operations); + if (ret) + goto err_wq; + + ib_sa_register_client(&sa_client); + register_netdevice_notifier(&cma_nb); + register_netevent_notifier(&cma_netevent_cb); + + ret = ib_register_client(&cma_client); + if (ret) + goto err; + + ret = cma_configfs_init(); + if (ret) + goto err_ib; + + return 0; + +err_ib: + ib_unregister_client(&cma_client); +err: + unregister_netevent_notifier(&cma_netevent_cb); + unregister_netdevice_notifier(&cma_nb); + ib_sa_unregister_client(&sa_client); + unregister_pernet_subsys(&cma_pernet_operations); +err_wq: + destroy_workqueue(cma_wq); + return ret; +} + +static void __exit cma_cleanup(void) +{ + cma_configfs_exit(); + ib_unregister_client(&cma_client); + unregister_netevent_notifier(&cma_netevent_cb); + unregister_netdevice_notifier(&cma_nb); + ib_sa_unregister_client(&sa_client); + unregister_pernet_subsys(&cma_pernet_operations); + destroy_workqueue(cma_wq); +} + +module_init(cma_init); +module_exit(cma_cleanup); |