diff options
Diffstat (limited to 'drivers/infiniband/core/cm.c')
| -rw-r--r-- | drivers/infiniband/core/cm.c | 4534 |
1 files changed, 4534 insertions, 0 deletions
diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c new file mode 100644 index 000000000..db1a25fbe --- /dev/null +++ b/drivers/infiniband/core/cm.c @@ -0,0 +1,4534 @@ +// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB +/* + * Copyright (c) 2004-2007 Intel Corporation. All rights reserved. + * Copyright (c) 2004 Topspin Corporation. All rights reserved. + * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved. + * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. + * Copyright (c) 2019, Mellanox Technologies inc. All rights reserved. + */ + +#include <linux/completion.h> +#include <linux/dma-mapping.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/err.h> +#include <linux/idr.h> +#include <linux/interrupt.h> +#include <linux/random.h> +#include <linux/rbtree.h> +#include <linux/spinlock.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/workqueue.h> +#include <linux/kdev_t.h> +#include <linux/etherdevice.h> + +#include <rdma/ib_cache.h> +#include <rdma/ib_cm.h> +#include "cm_msgs.h" +#include "core_priv.h" +#include "cm_trace.h" + +MODULE_AUTHOR("Sean Hefty"); +MODULE_DESCRIPTION("InfiniBand CM"); +MODULE_LICENSE("Dual BSD/GPL"); + +static const char * const ibcm_rej_reason_strs[] = { + [IB_CM_REJ_NO_QP] = "no QP", + [IB_CM_REJ_NO_EEC] = "no EEC", + [IB_CM_REJ_NO_RESOURCES] = "no resources", + [IB_CM_REJ_TIMEOUT] = "timeout", + [IB_CM_REJ_UNSUPPORTED] = "unsupported", + [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID", + [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance", + [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID", + [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type", + [IB_CM_REJ_STALE_CONN] = "stale conn", + [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist", + [IB_CM_REJ_INVALID_GID] = "invalid GID", + [IB_CM_REJ_INVALID_LID] = "invalid LID", + [IB_CM_REJ_INVALID_SL] = "invalid SL", + [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class", + [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit", + [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate", + [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID", + [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID", + [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL", + [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class", + [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit", + [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate", + [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect", + [IB_CM_REJ_PORT_REDIRECT] = "port redirect", + [IB_CM_REJ_INVALID_MTU] = "invalid MTU", + [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources", + [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined", + [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry", + [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID", + [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version", + [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label", + [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label", + [IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED] = + "vendor option is not supported", +}; + +const char *__attribute_const__ ibcm_reject_msg(int reason) +{ + size_t index = reason; + + if (index < ARRAY_SIZE(ibcm_rej_reason_strs) && + ibcm_rej_reason_strs[index]) + return ibcm_rej_reason_strs[index]; + else + return "unrecognized reason"; +} +EXPORT_SYMBOL(ibcm_reject_msg); + +struct cm_id_private; +struct cm_work; +static int cm_add_one(struct ib_device *device); +static void cm_remove_one(struct ib_device *device, void *client_data); +static void cm_process_work(struct cm_id_private *cm_id_priv, + struct cm_work *work); +static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, + struct ib_cm_sidr_rep_param *param); +static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv, + const void *private_data, u8 private_data_len); +static int cm_send_drep_locked(struct cm_id_private *cm_id_priv, + void *private_data, u8 private_data_len); +static int cm_send_rej_locked(struct cm_id_private *cm_id_priv, + enum ib_cm_rej_reason reason, void *ari, + u8 ari_length, const void *private_data, + u8 private_data_len); + +static struct ib_client cm_client = { + .name = "cm", + .add = cm_add_one, + .remove = cm_remove_one +}; + +static struct ib_cm { + spinlock_t lock; + struct list_head device_list; + rwlock_t device_lock; + struct rb_root listen_service_table; + u64 listen_service_id; + /* struct rb_root peer_service_table; todo: fix peer to peer */ + struct rb_root remote_qp_table; + struct rb_root remote_id_table; + struct rb_root remote_sidr_table; + struct xarray local_id_table; + u32 local_id_next; + __be32 random_id_operand; + struct list_head timewait_list; + struct workqueue_struct *wq; + /* Sync on cm change port state */ + spinlock_t state_lock; +} cm; + +/* Counter indexes ordered by attribute ID */ +enum { + CM_REQ_COUNTER, + CM_MRA_COUNTER, + CM_REJ_COUNTER, + CM_REP_COUNTER, + CM_RTU_COUNTER, + CM_DREQ_COUNTER, + CM_DREP_COUNTER, + CM_SIDR_REQ_COUNTER, + CM_SIDR_REP_COUNTER, + CM_LAP_COUNTER, + CM_APR_COUNTER, + CM_ATTR_COUNT, + CM_ATTR_ID_OFFSET = 0x0010, +}; + +enum { + CM_XMIT, + CM_XMIT_RETRIES, + CM_RECV, + CM_RECV_DUPLICATES, + CM_COUNTER_GROUPS +}; + +static char const counter_group_names[CM_COUNTER_GROUPS] + [sizeof("cm_rx_duplicates")] = { + "cm_tx_msgs", "cm_tx_retries", + "cm_rx_msgs", "cm_rx_duplicates" +}; + +struct cm_counter_group { + struct kobject obj; + atomic_long_t counter[CM_ATTR_COUNT]; +}; + +struct cm_counter_attribute { + struct attribute attr; + int index; +}; + +#define CM_COUNTER_ATTR(_name, _index) \ +struct cm_counter_attribute cm_##_name##_counter_attr = { \ + .attr = { .name = __stringify(_name), .mode = 0444 }, \ + .index = _index \ +} + +static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); +static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); +static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); +static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); +static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); +static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); +static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); +static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); +static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); +static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); +static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); + +static struct attribute *cm_counter_default_attrs[] = { + &cm_req_counter_attr.attr, + &cm_mra_counter_attr.attr, + &cm_rej_counter_attr.attr, + &cm_rep_counter_attr.attr, + &cm_rtu_counter_attr.attr, + &cm_dreq_counter_attr.attr, + &cm_drep_counter_attr.attr, + &cm_sidr_req_counter_attr.attr, + &cm_sidr_rep_counter_attr.attr, + &cm_lap_counter_attr.attr, + &cm_apr_counter_attr.attr, + NULL +}; + +struct cm_port { + struct cm_device *cm_dev; + struct ib_mad_agent *mad_agent; + u8 port_num; + struct list_head cm_priv_prim_list; + struct list_head cm_priv_altr_list; + struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; +}; + +struct cm_device { + struct list_head list; + struct ib_device *ib_device; + u8 ack_delay; + int going_down; + struct cm_port *port[]; +}; + +struct cm_av { + struct cm_port *port; + union ib_gid dgid; + struct rdma_ah_attr ah_attr; + u16 pkey_index; + u8 timeout; +}; + +struct cm_work { + struct delayed_work work; + struct list_head list; + struct cm_port *port; + struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ + __be32 local_id; /* Established / timewait */ + __be32 remote_id; + struct ib_cm_event cm_event; + struct sa_path_rec path[]; +}; + +struct cm_timewait_info { + struct cm_work work; + struct list_head list; + struct rb_node remote_qp_node; + struct rb_node remote_id_node; + __be64 remote_ca_guid; + __be32 remote_qpn; + u8 inserted_remote_qp; + u8 inserted_remote_id; +}; + +struct cm_id_private { + struct ib_cm_id id; + + struct rb_node service_node; + struct rb_node sidr_id_node; + spinlock_t lock; /* Do not acquire inside cm.lock */ + struct completion comp; + refcount_t refcount; + /* Number of clients sharing this ib_cm_id. Only valid for listeners. + * Protected by the cm.lock spinlock. */ + int listen_sharecount; + struct rcu_head rcu; + + struct ib_mad_send_buf *msg; + struct cm_timewait_info *timewait_info; + /* todo: use alternate port on send failure */ + struct cm_av av; + struct cm_av alt_av; + + void *private_data; + __be64 tid; + __be32 local_qpn; + __be32 remote_qpn; + enum ib_qp_type qp_type; + __be32 sq_psn; + __be32 rq_psn; + int timeout_ms; + enum ib_mtu path_mtu; + __be16 pkey; + u8 private_data_len; + u8 max_cm_retries; + u8 responder_resources; + u8 initiator_depth; + u8 retry_count; + u8 rnr_retry_count; + u8 service_timeout; + u8 target_ack_delay; + + struct list_head prim_list; + struct list_head altr_list; + /* Indicates that the send port mad is registered and av is set */ + int prim_send_port_not_ready; + int altr_send_port_not_ready; + + struct list_head work_list; + atomic_t work_count; + + struct rdma_ucm_ece ece; +}; + +static void cm_work_handler(struct work_struct *work); + +static inline void cm_deref_id(struct cm_id_private *cm_id_priv) +{ + if (refcount_dec_and_test(&cm_id_priv->refcount)) + complete(&cm_id_priv->comp); +} + +static int cm_alloc_msg(struct cm_id_private *cm_id_priv, + struct ib_mad_send_buf **msg) +{ + struct ib_mad_agent *mad_agent; + struct ib_mad_send_buf *m; + struct ib_ah *ah; + struct cm_av *av; + unsigned long flags, flags2; + int ret = 0; + + /* don't let the port to be released till the agent is down */ + spin_lock_irqsave(&cm.state_lock, flags2); + spin_lock_irqsave(&cm.lock, flags); + if (!cm_id_priv->prim_send_port_not_ready) + av = &cm_id_priv->av; + else if (!cm_id_priv->altr_send_port_not_ready && + (cm_id_priv->alt_av.port)) + av = &cm_id_priv->alt_av; + else { + pr_info("%s: not valid CM id\n", __func__); + ret = -ENODEV; + spin_unlock_irqrestore(&cm.lock, flags); + goto out; + } + spin_unlock_irqrestore(&cm.lock, flags); + /* Make sure the port haven't released the mad yet */ + mad_agent = cm_id_priv->av.port->mad_agent; + if (!mad_agent) { + pr_info("%s: not a valid MAD agent\n", __func__); + ret = -ENODEV; + goto out; + } + ah = rdma_create_ah(mad_agent->qp->pd, &av->ah_attr, 0); + if (IS_ERR(ah)) { + ret = PTR_ERR(ah); + goto out; + } + + m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, + av->pkey_index, + 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, + GFP_ATOMIC, + IB_MGMT_BASE_VERSION); + if (IS_ERR(m)) { + rdma_destroy_ah(ah, 0); + ret = PTR_ERR(m); + goto out; + } + + /* Timeout set by caller if response is expected. */ + m->ah = ah; + m->retries = cm_id_priv->max_cm_retries; + + refcount_inc(&cm_id_priv->refcount); + m->context[0] = cm_id_priv; + *msg = m; + +out: + spin_unlock_irqrestore(&cm.state_lock, flags2); + return ret; +} + +static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port, + struct ib_mad_recv_wc *mad_recv_wc) +{ + return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, + 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, + GFP_ATOMIC, + IB_MGMT_BASE_VERSION); +} + +static int cm_create_response_msg_ah(struct cm_port *port, + struct ib_mad_recv_wc *mad_recv_wc, + struct ib_mad_send_buf *msg) +{ + struct ib_ah *ah; + + ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, + mad_recv_wc->recv_buf.grh, port->port_num); + if (IS_ERR(ah)) + return PTR_ERR(ah); + + msg->ah = ah; + return 0; +} + +static void cm_free_msg(struct ib_mad_send_buf *msg) +{ + if (msg->ah) + rdma_destroy_ah(msg->ah, 0); + if (msg->context[0]) + cm_deref_id(msg->context[0]); + ib_free_send_mad(msg); +} + +static int cm_alloc_response_msg(struct cm_port *port, + struct ib_mad_recv_wc *mad_recv_wc, + struct ib_mad_send_buf **msg) +{ + struct ib_mad_send_buf *m; + int ret; + + m = cm_alloc_response_msg_no_ah(port, mad_recv_wc); + if (IS_ERR(m)) + return PTR_ERR(m); + + ret = cm_create_response_msg_ah(port, mad_recv_wc, m); + if (ret) { + cm_free_msg(m); + return ret; + } + + *msg = m; + return 0; +} + +static void * cm_copy_private_data(const void *private_data, + u8 private_data_len) +{ + void *data; + + if (!private_data || !private_data_len) + return NULL; + + data = kmemdup(private_data, private_data_len, GFP_KERNEL); + if (!data) + return ERR_PTR(-ENOMEM); + + return data; +} + +static void cm_set_private_data(struct cm_id_private *cm_id_priv, + void *private_data, u8 private_data_len) +{ + if (cm_id_priv->private_data && cm_id_priv->private_data_len) + kfree(cm_id_priv->private_data); + + cm_id_priv->private_data = private_data; + cm_id_priv->private_data_len = private_data_len; +} + +static int cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc, + struct ib_grh *grh, struct cm_av *av) +{ + struct rdma_ah_attr new_ah_attr; + int ret; + + av->port = port; + av->pkey_index = wc->pkey_index; + + /* + * av->ah_attr might be initialized based on past wc during incoming + * connect request or while sending out connect request. So initialize + * a new ah_attr on stack. If initialization fails, old ah_attr is + * used for sending any responses. If initialization is successful, + * than new ah_attr is used by overwriting old one. + */ + ret = ib_init_ah_attr_from_wc(port->cm_dev->ib_device, + port->port_num, wc, + grh, &new_ah_attr); + if (ret) + return ret; + + rdma_move_ah_attr(&av->ah_attr, &new_ah_attr); + return 0; +} + +static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, + struct ib_grh *grh, struct cm_av *av) +{ + av->port = port; + av->pkey_index = wc->pkey_index; + return ib_init_ah_attr_from_wc(port->cm_dev->ib_device, + port->port_num, wc, + grh, &av->ah_attr); +} + +static void add_cm_id_to_port_list(struct cm_id_private *cm_id_priv, + struct cm_av *av, struct cm_port *port) +{ + unsigned long flags; + + spin_lock_irqsave(&cm.lock, flags); + if (&cm_id_priv->av == av) + list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list); + else if (&cm_id_priv->alt_av == av) + list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list); + else + WARN_ON(true); + spin_unlock_irqrestore(&cm.lock, flags); +} + +static struct cm_port * +get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr) +{ + struct cm_device *cm_dev; + struct cm_port *port = NULL; + unsigned long flags; + + if (attr) { + read_lock_irqsave(&cm.device_lock, flags); + list_for_each_entry(cm_dev, &cm.device_list, list) { + if (cm_dev->ib_device == attr->device) { + port = cm_dev->port[attr->port_num - 1]; + break; + } + } + read_unlock_irqrestore(&cm.device_lock, flags); + } else { + /* SGID attribute can be NULL in following + * conditions. + * (a) Alternative path + * (b) IB link layer without GRH + * (c) LAP send messages + */ + read_lock_irqsave(&cm.device_lock, flags); + list_for_each_entry(cm_dev, &cm.device_list, list) { + attr = rdma_find_gid(cm_dev->ib_device, + &path->sgid, + sa_conv_pathrec_to_gid_type(path), + NULL); + if (!IS_ERR(attr)) { + port = cm_dev->port[attr->port_num - 1]; + break; + } + } + read_unlock_irqrestore(&cm.device_lock, flags); + if (port) + rdma_put_gid_attr(attr); + } + return port; +} + +static int cm_init_av_by_path(struct sa_path_rec *path, + const struct ib_gid_attr *sgid_attr, + struct cm_av *av, + struct cm_id_private *cm_id_priv) +{ + struct rdma_ah_attr new_ah_attr; + struct cm_device *cm_dev; + struct cm_port *port; + int ret; + + port = get_cm_port_from_path(path, sgid_attr); + if (!port) + return -EINVAL; + cm_dev = port->cm_dev; + + ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, + be16_to_cpu(path->pkey), &av->pkey_index); + if (ret) + return ret; + + av->port = port; + + /* + * av->ah_attr might be initialized based on wc or during + * request processing time which might have reference to sgid_attr. + * So initialize a new ah_attr on stack. + * If initialization fails, old ah_attr is used for sending any + * responses. If initialization is successful, than new ah_attr + * is used by overwriting the old one. So that right ah_attr + * can be used to return an error response. + */ + ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path, + &new_ah_attr, sgid_attr); + if (ret) + return ret; + + av->timeout = path->packet_life_time + 1; + add_cm_id_to_port_list(cm_id_priv, av, port); + rdma_move_ah_attr(&av->ah_attr, &new_ah_attr); + return 0; +} + +static u32 cm_local_id(__be32 local_id) +{ + return (__force u32) (local_id ^ cm.random_id_operand); +} + +static struct cm_id_private *cm_acquire_id(__be32 local_id, __be32 remote_id) +{ + struct cm_id_private *cm_id_priv; + + rcu_read_lock(); + cm_id_priv = xa_load(&cm.local_id_table, cm_local_id(local_id)); + if (!cm_id_priv || cm_id_priv->id.remote_id != remote_id || + !refcount_inc_not_zero(&cm_id_priv->refcount)) + cm_id_priv = NULL; + rcu_read_unlock(); + + return cm_id_priv; +} + +/* + * Trivial helpers to strip endian annotation and compare; the + * endianness doesn't actually matter since we just need a stable + * order for the RB tree. + */ +static int be32_lt(__be32 a, __be32 b) +{ + return (__force u32) a < (__force u32) b; +} + +static int be32_gt(__be32 a, __be32 b) +{ + return (__force u32) a > (__force u32) b; +} + +static int be64_lt(__be64 a, __be64 b) +{ + return (__force u64) a < (__force u64) b; +} + +static int be64_gt(__be64 a, __be64 b) +{ + return (__force u64) a > (__force u64) b; +} + +/* + * Inserts a new cm_id_priv into the listen_service_table. Returns cm_id_priv + * if the new ID was inserted, NULL if it could not be inserted due to a + * collision, or the existing cm_id_priv ready for shared usage. + */ +static struct cm_id_private *cm_insert_listen(struct cm_id_private *cm_id_priv, + ib_cm_handler shared_handler) +{ + struct rb_node **link = &cm.listen_service_table.rb_node; + struct rb_node *parent = NULL; + struct cm_id_private *cur_cm_id_priv; + __be64 service_id = cm_id_priv->id.service_id; + __be64 service_mask = cm_id_priv->id.service_mask; + unsigned long flags; + + spin_lock_irqsave(&cm.lock, flags); + while (*link) { + parent = *link; + cur_cm_id_priv = rb_entry(parent, struct cm_id_private, + service_node); + if ((cur_cm_id_priv->id.service_mask & service_id) == + (service_mask & cur_cm_id_priv->id.service_id) && + (cm_id_priv->id.device == cur_cm_id_priv->id.device)) { + /* + * Sharing an ib_cm_id with different handlers is not + * supported + */ + if (cur_cm_id_priv->id.cm_handler != shared_handler || + cur_cm_id_priv->id.context || + WARN_ON(!cur_cm_id_priv->id.cm_handler)) { + spin_unlock_irqrestore(&cm.lock, flags); + return NULL; + } + refcount_inc(&cur_cm_id_priv->refcount); + cur_cm_id_priv->listen_sharecount++; + spin_unlock_irqrestore(&cm.lock, flags); + return cur_cm_id_priv; + } + + if (cm_id_priv->id.device < cur_cm_id_priv->id.device) + link = &(*link)->rb_left; + else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) + link = &(*link)->rb_right; + else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) + link = &(*link)->rb_left; + else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) + link = &(*link)->rb_right; + else + link = &(*link)->rb_right; + } + cm_id_priv->listen_sharecount++; + rb_link_node(&cm_id_priv->service_node, parent, link); + rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); + spin_unlock_irqrestore(&cm.lock, flags); + return cm_id_priv; +} + +static struct cm_id_private * cm_find_listen(struct ib_device *device, + __be64 service_id) +{ + struct rb_node *node = cm.listen_service_table.rb_node; + struct cm_id_private *cm_id_priv; + + while (node) { + cm_id_priv = rb_entry(node, struct cm_id_private, service_node); + if ((cm_id_priv->id.service_mask & service_id) == + cm_id_priv->id.service_id && + (cm_id_priv->id.device == device)) { + refcount_inc(&cm_id_priv->refcount); + return cm_id_priv; + } + if (device < cm_id_priv->id.device) + node = node->rb_left; + else if (device > cm_id_priv->id.device) + node = node->rb_right; + else if (be64_lt(service_id, cm_id_priv->id.service_id)) + node = node->rb_left; + else if (be64_gt(service_id, cm_id_priv->id.service_id)) + node = node->rb_right; + else + node = node->rb_right; + } + return NULL; +} + +static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info + *timewait_info) +{ + struct rb_node **link = &cm.remote_id_table.rb_node; + struct rb_node *parent = NULL; + struct cm_timewait_info *cur_timewait_info; + __be64 remote_ca_guid = timewait_info->remote_ca_guid; + __be32 remote_id = timewait_info->work.remote_id; + + while (*link) { + parent = *link; + cur_timewait_info = rb_entry(parent, struct cm_timewait_info, + remote_id_node); + if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) + link = &(*link)->rb_left; + else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) + link = &(*link)->rb_right; + else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) + link = &(*link)->rb_left; + else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) + link = &(*link)->rb_right; + else + return cur_timewait_info; + } + timewait_info->inserted_remote_id = 1; + rb_link_node(&timewait_info->remote_id_node, parent, link); + rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); + return NULL; +} + +static struct cm_id_private *cm_find_remote_id(__be64 remote_ca_guid, + __be32 remote_id) +{ + struct rb_node *node = cm.remote_id_table.rb_node; + struct cm_timewait_info *timewait_info; + struct cm_id_private *res = NULL; + + spin_lock_irq(&cm.lock); + while (node) { + timewait_info = rb_entry(node, struct cm_timewait_info, + remote_id_node); + if (be32_lt(remote_id, timewait_info->work.remote_id)) + node = node->rb_left; + else if (be32_gt(remote_id, timewait_info->work.remote_id)) + node = node->rb_right; + else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) + node = node->rb_left; + else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) + node = node->rb_right; + else { + res = cm_acquire_id(timewait_info->work.local_id, + timewait_info->work.remote_id); + break; + } + } + spin_unlock_irq(&cm.lock); + return res; +} + +static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info + *timewait_info) +{ + struct rb_node **link = &cm.remote_qp_table.rb_node; + struct rb_node *parent = NULL; + struct cm_timewait_info *cur_timewait_info; + __be64 remote_ca_guid = timewait_info->remote_ca_guid; + __be32 remote_qpn = timewait_info->remote_qpn; + + while (*link) { + parent = *link; + cur_timewait_info = rb_entry(parent, struct cm_timewait_info, + remote_qp_node); + if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) + link = &(*link)->rb_left; + else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) + link = &(*link)->rb_right; + else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) + link = &(*link)->rb_left; + else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) + link = &(*link)->rb_right; + else + return cur_timewait_info; + } + timewait_info->inserted_remote_qp = 1; + rb_link_node(&timewait_info->remote_qp_node, parent, link); + rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); + return NULL; +} + +static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private + *cm_id_priv) +{ + struct rb_node **link = &cm.remote_sidr_table.rb_node; + struct rb_node *parent = NULL; + struct cm_id_private *cur_cm_id_priv; + union ib_gid *port_gid = &cm_id_priv->av.dgid; + __be32 remote_id = cm_id_priv->id.remote_id; + + while (*link) { + parent = *link; + cur_cm_id_priv = rb_entry(parent, struct cm_id_private, + sidr_id_node); + if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) + link = &(*link)->rb_left; + else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) + link = &(*link)->rb_right; + else { + int cmp; + cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, + sizeof *port_gid); + if (cmp < 0) + link = &(*link)->rb_left; + else if (cmp > 0) + link = &(*link)->rb_right; + else + return cur_cm_id_priv; + } + } + rb_link_node(&cm_id_priv->sidr_id_node, parent, link); + rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); + return NULL; +} + +static struct cm_id_private *cm_alloc_id_priv(struct ib_device *device, + ib_cm_handler cm_handler, + void *context) +{ + struct cm_id_private *cm_id_priv; + u32 id; + int ret; + + cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); + if (!cm_id_priv) + return ERR_PTR(-ENOMEM); + + cm_id_priv->id.state = IB_CM_IDLE; + cm_id_priv->id.device = device; + cm_id_priv->id.cm_handler = cm_handler; + cm_id_priv->id.context = context; + cm_id_priv->id.remote_cm_qpn = 1; + + RB_CLEAR_NODE(&cm_id_priv->service_node); + RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); + spin_lock_init(&cm_id_priv->lock); + init_completion(&cm_id_priv->comp); + INIT_LIST_HEAD(&cm_id_priv->work_list); + INIT_LIST_HEAD(&cm_id_priv->prim_list); + INIT_LIST_HEAD(&cm_id_priv->altr_list); + atomic_set(&cm_id_priv->work_count, -1); + refcount_set(&cm_id_priv->refcount, 1); + + ret = xa_alloc_cyclic(&cm.local_id_table, &id, NULL, xa_limit_32b, + &cm.local_id_next, GFP_KERNEL); + if (ret < 0) + goto error; + cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; + + return cm_id_priv; + +error: + kfree(cm_id_priv); + return ERR_PTR(ret); +} + +/* + * Make the ID visible to the MAD handlers and other threads that use the + * xarray. + */ +static void cm_finalize_id(struct cm_id_private *cm_id_priv) +{ + xa_store(&cm.local_id_table, cm_local_id(cm_id_priv->id.local_id), + cm_id_priv, GFP_ATOMIC); +} + +struct ib_cm_id *ib_create_cm_id(struct ib_device *device, + ib_cm_handler cm_handler, + void *context) +{ + struct cm_id_private *cm_id_priv; + + cm_id_priv = cm_alloc_id_priv(device, cm_handler, context); + if (IS_ERR(cm_id_priv)) + return ERR_CAST(cm_id_priv); + + cm_finalize_id(cm_id_priv); + return &cm_id_priv->id; +} +EXPORT_SYMBOL(ib_create_cm_id); + +static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) +{ + struct cm_work *work; + + if (list_empty(&cm_id_priv->work_list)) + return NULL; + + work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); + list_del(&work->list); + return work; +} + +static void cm_free_work(struct cm_work *work) +{ + if (work->mad_recv_wc) + ib_free_recv_mad(work->mad_recv_wc); + kfree(work); +} + +static void cm_queue_work_unlock(struct cm_id_private *cm_id_priv, + struct cm_work *work) + __releases(&cm_id_priv->lock) +{ + bool immediate; + + /* + * To deliver the event to the user callback we have the drop the + * spinlock, however, we need to ensure that the user callback is single + * threaded and receives events in the temporal order. If there are + * already events being processed then thread new events onto a list, + * the thread currently processing will pick them up. + */ + immediate = atomic_inc_and_test(&cm_id_priv->work_count); + if (!immediate) { + list_add_tail(&work->list, &cm_id_priv->work_list); + /* + * This routine always consumes incoming reference. Once queued + * to the work_list then a reference is held by the thread + * currently running cm_process_work() and this reference is not + * needed. + */ + cm_deref_id(cm_id_priv); + } + spin_unlock_irq(&cm_id_priv->lock); + + if (immediate) + cm_process_work(cm_id_priv, work); +} + +static inline int cm_convert_to_ms(int iba_time) +{ + /* approximate conversion to ms from 4.096us x 2^iba_time */ + return 1 << max(iba_time - 8, 0); +} + +/* + * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time + * Because of how ack_timeout is stored, adding one doubles the timeout. + * To avoid large timeouts, select the max(ack_delay, life_time + 1), and + * increment it (round up) only if the other is within 50%. + */ +static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) +{ + int ack_timeout = packet_life_time + 1; + + if (ack_timeout >= ca_ack_delay) + ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); + else + ack_timeout = ca_ack_delay + + (ack_timeout >= (ca_ack_delay - 1)); + + return min(31, ack_timeout); +} + +static void cm_remove_remote(struct cm_id_private *cm_id_priv) +{ + struct cm_timewait_info *timewait_info = cm_id_priv->timewait_info; + + if (timewait_info->inserted_remote_id) { + rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); + timewait_info->inserted_remote_id = 0; + } + + if (timewait_info->inserted_remote_qp) { + rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); + timewait_info->inserted_remote_qp = 0; + } +} + +static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) +{ + struct cm_timewait_info *timewait_info; + + timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); + if (!timewait_info) + return ERR_PTR(-ENOMEM); + + timewait_info->work.local_id = local_id; + INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); + timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; + return timewait_info; +} + +static void cm_enter_timewait(struct cm_id_private *cm_id_priv) +{ + int wait_time; + unsigned long flags; + struct cm_device *cm_dev; + + lockdep_assert_held(&cm_id_priv->lock); + + cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client); + if (!cm_dev) + return; + + spin_lock_irqsave(&cm.lock, flags); + cm_remove_remote(cm_id_priv); + list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); + spin_unlock_irqrestore(&cm.lock, flags); + + /* + * The cm_id could be destroyed by the user before we exit timewait. + * To protect against this, we search for the cm_id after exiting + * timewait before notifying the user that we've exited timewait. + */ + cm_id_priv->id.state = IB_CM_TIMEWAIT; + wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); + + /* Check if the device started its remove_one */ + spin_lock_irqsave(&cm.lock, flags); + if (!cm_dev->going_down) + queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, + msecs_to_jiffies(wait_time)); + spin_unlock_irqrestore(&cm.lock, flags); + + /* + * The timewait_info is converted into a work and gets freed during + * cm_free_work() in cm_timewait_handler(). + */ + BUILD_BUG_ON(offsetof(struct cm_timewait_info, work) != 0); + cm_id_priv->timewait_info = NULL; +} + +static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) +{ + unsigned long flags; + + lockdep_assert_held(&cm_id_priv->lock); + + cm_id_priv->id.state = IB_CM_IDLE; + if (cm_id_priv->timewait_info) { + spin_lock_irqsave(&cm.lock, flags); + cm_remove_remote(cm_id_priv); + spin_unlock_irqrestore(&cm.lock, flags); + kfree(cm_id_priv->timewait_info); + cm_id_priv->timewait_info = NULL; + } +} + +static void cm_destroy_id(struct ib_cm_id *cm_id, int err) +{ + struct cm_id_private *cm_id_priv; + struct cm_work *work; + + cm_id_priv = container_of(cm_id, struct cm_id_private, id); + spin_lock_irq(&cm_id_priv->lock); +retest: + switch (cm_id->state) { + case IB_CM_LISTEN: + spin_lock(&cm.lock); + if (--cm_id_priv->listen_sharecount > 0) { + /* The id is still shared. */ + WARN_ON(refcount_read(&cm_id_priv->refcount) == 1); + spin_unlock(&cm.lock); + spin_unlock_irq(&cm_id_priv->lock); + cm_deref_id(cm_id_priv); + return; + } + cm_id->state = IB_CM_IDLE; + rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); + RB_CLEAR_NODE(&cm_id_priv->service_node); + spin_unlock(&cm.lock); + break; + case IB_CM_SIDR_REQ_SENT: + cm_id->state = IB_CM_IDLE; + ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); + break; + case IB_CM_SIDR_REQ_RCVD: + cm_send_sidr_rep_locked(cm_id_priv, + &(struct ib_cm_sidr_rep_param){ + .status = IB_SIDR_REJECT }); + /* cm_send_sidr_rep_locked will not move to IDLE if it fails */ + cm_id->state = IB_CM_IDLE; + break; + case IB_CM_REQ_SENT: + case IB_CM_MRA_REQ_RCVD: + ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); + cm_send_rej_locked(cm_id_priv, IB_CM_REJ_TIMEOUT, + &cm_id_priv->id.device->node_guid, + sizeof(cm_id_priv->id.device->node_guid), + NULL, 0); + break; + case IB_CM_REQ_RCVD: + if (err == -ENOMEM) { + /* Do not reject to allow future retries. */ + cm_reset_to_idle(cm_id_priv); + } else { + cm_send_rej_locked(cm_id_priv, + IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, + NULL, 0); + } + break; + case IB_CM_REP_SENT: + case IB_CM_MRA_REP_RCVD: + ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); + cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, + 0, NULL, 0); + goto retest; + case IB_CM_MRA_REQ_SENT: + case IB_CM_REP_RCVD: + case IB_CM_MRA_REP_SENT: + cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL, + 0, NULL, 0); + break; + case IB_CM_ESTABLISHED: + if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) { + cm_id->state = IB_CM_IDLE; + break; + } + cm_send_dreq_locked(cm_id_priv, NULL, 0); + goto retest; + case IB_CM_DREQ_SENT: + ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); + cm_enter_timewait(cm_id_priv); + goto retest; + case IB_CM_DREQ_RCVD: + cm_send_drep_locked(cm_id_priv, NULL, 0); + WARN_ON(cm_id->state != IB_CM_TIMEWAIT); + goto retest; + case IB_CM_TIMEWAIT: + /* + * The cm_acquire_id in cm_timewait_handler will stop working + * once we do xa_erase below, so just move to idle here for + * consistency. + */ + cm_id->state = IB_CM_IDLE; + break; + case IB_CM_IDLE: + break; + } + WARN_ON(cm_id->state != IB_CM_IDLE); + + spin_lock(&cm.lock); + /* Required for cleanup paths related cm_req_handler() */ + if (cm_id_priv->timewait_info) { + cm_remove_remote(cm_id_priv); + kfree(cm_id_priv->timewait_info); + cm_id_priv->timewait_info = NULL; + } + if (!list_empty(&cm_id_priv->altr_list) && + (!cm_id_priv->altr_send_port_not_ready)) + list_del(&cm_id_priv->altr_list); + if (!list_empty(&cm_id_priv->prim_list) && + (!cm_id_priv->prim_send_port_not_ready)) + list_del(&cm_id_priv->prim_list); + WARN_ON(cm_id_priv->listen_sharecount); + WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node)); + if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) + rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); + spin_unlock(&cm.lock); + spin_unlock_irq(&cm_id_priv->lock); + + xa_erase(&cm.local_id_table, cm_local_id(cm_id->local_id)); + cm_deref_id(cm_id_priv); + wait_for_completion(&cm_id_priv->comp); + while ((work = cm_dequeue_work(cm_id_priv)) != NULL) + cm_free_work(work); + + rdma_destroy_ah_attr(&cm_id_priv->av.ah_attr); + rdma_destroy_ah_attr(&cm_id_priv->alt_av.ah_attr); + kfree(cm_id_priv->private_data); + kfree_rcu(cm_id_priv, rcu); +} + +void ib_destroy_cm_id(struct ib_cm_id *cm_id) +{ + cm_destroy_id(cm_id, 0); +} +EXPORT_SYMBOL(ib_destroy_cm_id); + +static int cm_init_listen(struct cm_id_private *cm_id_priv, __be64 service_id, + __be64 service_mask) +{ + service_mask = service_mask ? service_mask : ~cpu_to_be64(0); + service_id &= service_mask; + if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && + (service_id != IB_CM_ASSIGN_SERVICE_ID)) + return -EINVAL; + + if (service_id == IB_CM_ASSIGN_SERVICE_ID) { + cm_id_priv->id.service_id = cpu_to_be64(cm.listen_service_id++); + cm_id_priv->id.service_mask = ~cpu_to_be64(0); + } else { + cm_id_priv->id.service_id = service_id; + cm_id_priv->id.service_mask = service_mask; + } + return 0; +} + +/** + * ib_cm_listen - Initiates listening on the specified service ID for + * connection and service ID resolution requests. + * @cm_id: Connection identifier associated with the listen request. + * @service_id: Service identifier matched against incoming connection + * and service ID resolution requests. The service ID should be specified + * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will + * assign a service ID to the caller. + * @service_mask: Mask applied to service ID used to listen across a + * range of service IDs. If set to 0, the service ID is matched + * exactly. This parameter is ignored if %service_id is set to + * IB_CM_ASSIGN_SERVICE_ID. + */ +int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask) +{ + struct cm_id_private *cm_id_priv = + container_of(cm_id, struct cm_id_private, id); + unsigned long flags; + int ret; + + spin_lock_irqsave(&cm_id_priv->lock, flags); + if (cm_id_priv->id.state != IB_CM_IDLE) { + ret = -EINVAL; + goto out; + } + + ret = cm_init_listen(cm_id_priv, service_id, service_mask); + if (ret) + goto out; + + if (!cm_insert_listen(cm_id_priv, NULL)) { + ret = -EBUSY; + goto out; + } + + cm_id_priv->id.state = IB_CM_LISTEN; + ret = 0; + +out: + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + return ret; +} +EXPORT_SYMBOL(ib_cm_listen); + +/** + * Create a new listening ib_cm_id and listen on the given service ID. + * + * If there's an existing ID listening on that same device and service ID, + * return it. + * + * @device: Device associated with the cm_id. All related communication will + * be associated with the specified device. + * @cm_handler: Callback invoked to notify the user of CM events. + * @service_id: Service identifier matched against incoming connection + * and service ID resolution requests. The service ID should be specified + * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will + * assign a service ID to the caller. + * + * Callers should call ib_destroy_cm_id when done with the listener ID. + */ +struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, + ib_cm_handler cm_handler, + __be64 service_id) +{ + struct cm_id_private *listen_id_priv; + struct cm_id_private *cm_id_priv; + int err = 0; + + /* Create an ID in advance, since the creation may sleep */ + cm_id_priv = cm_alloc_id_priv(device, cm_handler, NULL); + if (IS_ERR(cm_id_priv)) + return ERR_CAST(cm_id_priv); + + err = cm_init_listen(cm_id_priv, service_id, 0); + if (err) { + ib_destroy_cm_id(&cm_id_priv->id); + return ERR_PTR(err); + } + + spin_lock_irq(&cm_id_priv->lock); + listen_id_priv = cm_insert_listen(cm_id_priv, cm_handler); + if (listen_id_priv != cm_id_priv) { + spin_unlock_irq(&cm_id_priv->lock); + ib_destroy_cm_id(&cm_id_priv->id); + if (!listen_id_priv) + return ERR_PTR(-EINVAL); + return &listen_id_priv->id; + } + cm_id_priv->id.state = IB_CM_LISTEN; + spin_unlock_irq(&cm_id_priv->lock); + + /* + * A listen ID does not need to be in the xarray since it does not + * receive mads, is not placed in the remote_id or remote_qpn rbtree, + * and does not enter timewait. + */ + + return &cm_id_priv->id; +} +EXPORT_SYMBOL(ib_cm_insert_listen); + +static __be64 cm_form_tid(struct cm_id_private *cm_id_priv) +{ + u64 hi_tid, low_tid; + + hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; + low_tid = (u64)cm_id_priv->id.local_id; + return cpu_to_be64(hi_tid | low_tid); +} + +static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, + __be16 attr_id, __be64 tid) +{ + hdr->base_version = IB_MGMT_BASE_VERSION; + hdr->mgmt_class = IB_MGMT_CLASS_CM; + hdr->class_version = IB_CM_CLASS_VERSION; + hdr->method = IB_MGMT_METHOD_SEND; + hdr->attr_id = attr_id; + hdr->tid = tid; +} + +static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id, + __be64 tid, u32 attr_mod) +{ + cm_format_mad_hdr(hdr, attr_id, tid); + hdr->attr_mod = cpu_to_be32(attr_mod); +} + +static void cm_format_req(struct cm_req_msg *req_msg, + struct cm_id_private *cm_id_priv, + struct ib_cm_req_param *param) +{ + struct sa_path_rec *pri_path = param->primary_path; + struct sa_path_rec *alt_path = param->alternate_path; + bool pri_ext = false; + + if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA) + pri_ext = opa_is_extended_lid(pri_path->opa.dlid, + pri_path->opa.slid); + + cm_format_mad_ece_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, + cm_form_tid(cm_id_priv), param->ece.attr_mod); + + IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg, + be32_to_cpu(cm_id_priv->id.local_id)); + IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id)); + IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg, + be64_to_cpu(cm_id_priv->id.device->node_guid)); + IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num); + IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth); + IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg, + param->remote_cm_response_timeout); + cm_req_set_qp_type(req_msg, param->qp_type); + IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control); + IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn); + IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg, + param->local_cm_response_timeout); + IBA_SET(CM_REQ_PARTITION_KEY, req_msg, + be16_to_cpu(param->primary_path->pkey)); + IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg, + param->primary_path->mtu); + IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries); + + if (param->qp_type != IB_QPT_XRC_INI) { + IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg, + param->responder_resources); + IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count); + IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg, + param->rnr_retry_count); + IBA_SET(CM_REQ_SRQ, req_msg, param->srq); + } + + *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) = + pri_path->sgid; + *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) = + pri_path->dgid; + if (pri_ext) { + IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) + ->global.interface_id = + OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid)); + IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) + ->global.interface_id = + OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid)); + } + if (pri_path->hop_limit <= 1) { + IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, + be16_to_cpu(pri_ext ? 0 : + htons(ntohl(sa_path_get_slid( + pri_path))))); + IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, + be16_to_cpu(pri_ext ? 0 : + htons(ntohl(sa_path_get_dlid( + pri_path))))); + } else { + /* Work-around until there's a way to obtain remote LID info */ + IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, + be16_to_cpu(IB_LID_PERMISSIVE)); + IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, + be16_to_cpu(IB_LID_PERMISSIVE)); + } + IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg, + be32_to_cpu(pri_path->flow_label)); + IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate); + IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class); + IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit); + IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl); + IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg, + (pri_path->hop_limit <= 1)); + IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg, + cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, + pri_path->packet_life_time)); + + if (alt_path) { + bool alt_ext = false; + + if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA) + alt_ext = opa_is_extended_lid(alt_path->opa.dlid, + alt_path->opa.slid); + + *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) = + alt_path->sgid; + *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) = + alt_path->dgid; + if (alt_ext) { + IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, + req_msg) + ->global.interface_id = + OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid)); + IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, + req_msg) + ->global.interface_id = + OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid)); + } + if (alt_path->hop_limit <= 1) { + IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, + be16_to_cpu( + alt_ext ? 0 : + htons(ntohl(sa_path_get_slid( + alt_path))))); + IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, + be16_to_cpu( + alt_ext ? 0 : + htons(ntohl(sa_path_get_dlid( + alt_path))))); + } else { + IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, + be16_to_cpu(IB_LID_PERMISSIVE)); + IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, + be16_to_cpu(IB_LID_PERMISSIVE)); + } + IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg, + be32_to_cpu(alt_path->flow_label)); + IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate); + IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg, + alt_path->traffic_class); + IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg, + alt_path->hop_limit); + IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl); + IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg, + (alt_path->hop_limit <= 1)); + IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg, + cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, + alt_path->packet_life_time)); + } + IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id); + + if (param->private_data && param->private_data_len) + IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data, + param->private_data_len); +} + +static int cm_validate_req_param(struct ib_cm_req_param *param) +{ + if (!param->primary_path) + return -EINVAL; + + if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && + param->qp_type != IB_QPT_XRC_INI) + return -EINVAL; + + if (param->private_data && + param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) + return -EINVAL; + + if (param->alternate_path && + (param->alternate_path->pkey != param->primary_path->pkey || + param->alternate_path->mtu != param->primary_path->mtu)) + return -EINVAL; + + return 0; +} + +int ib_send_cm_req(struct ib_cm_id *cm_id, + struct ib_cm_req_param *param) +{ + struct cm_id_private *cm_id_priv; + struct cm_req_msg *req_msg; + unsigned long flags; + int ret; + + ret = cm_validate_req_param(param); + if (ret) + return ret; + + /* Verify that we're not in timewait. */ + cm_id_priv = container_of(cm_id, struct cm_id_private, id); + spin_lock_irqsave(&cm_id_priv->lock, flags); + if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) { + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + ret = -EINVAL; + goto out; + } + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + + cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> + id.local_id); + if (IS_ERR(cm_id_priv->timewait_info)) { + ret = PTR_ERR(cm_id_priv->timewait_info); + cm_id_priv->timewait_info = NULL; + goto out; + } + + ret = cm_init_av_by_path(param->primary_path, + param->ppath_sgid_attr, &cm_id_priv->av, + cm_id_priv); + if (ret) + goto out; + if (param->alternate_path) { + ret = cm_init_av_by_path(param->alternate_path, NULL, + &cm_id_priv->alt_av, cm_id_priv); + if (ret) + goto out; + } + cm_id->service_id = param->service_id; + cm_id->service_mask = ~cpu_to_be64(0); + cm_id_priv->timeout_ms = cm_convert_to_ms( + param->primary_path->packet_life_time) * 2 + + cm_convert_to_ms( + param->remote_cm_response_timeout); + cm_id_priv->max_cm_retries = param->max_cm_retries; + cm_id_priv->initiator_depth = param->initiator_depth; + cm_id_priv->responder_resources = param->responder_resources; + cm_id_priv->retry_count = param->retry_count; + cm_id_priv->path_mtu = param->primary_path->mtu; + cm_id_priv->pkey = param->primary_path->pkey; + cm_id_priv->qp_type = param->qp_type; + + ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); + if (ret) + goto out; + + req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; + cm_format_req(req_msg, cm_id_priv, param); + cm_id_priv->tid = req_msg->hdr.tid; + cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; + cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; + + cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); + cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); + + trace_icm_send_req(&cm_id_priv->id); + spin_lock_irqsave(&cm_id_priv->lock, flags); + ret = ib_post_send_mad(cm_id_priv->msg, NULL); + if (ret) { + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + goto error2; + } + BUG_ON(cm_id->state != IB_CM_IDLE); + cm_id->state = IB_CM_REQ_SENT; + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + return 0; + +error2: cm_free_msg(cm_id_priv->msg); +out: return ret; +} +EXPORT_SYMBOL(ib_send_cm_req); + +static int cm_issue_rej(struct cm_port *port, + struct ib_mad_recv_wc *mad_recv_wc, + enum ib_cm_rej_reason reason, + enum cm_msg_response msg_rejected, + void *ari, u8 ari_length) +{ + struct ib_mad_send_buf *msg = NULL; + struct cm_rej_msg *rej_msg, *rcv_msg; + int ret; + + ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); + if (ret) + return ret; + + /* We just need common CM header information. Cast to any message. */ + rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; + rej_msg = (struct cm_rej_msg *) msg->mad; + + cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); + IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, + IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg)); + IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, + IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); + IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected); + IBA_SET(CM_REJ_REASON, rej_msg, reason); + + if (ari && ari_length) { + IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); + IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); + } + + trace_icm_issue_rej( + IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg), + IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg)); + ret = ib_post_send_mad(msg, NULL); + if (ret) + cm_free_msg(msg); + + return ret; +} + +static bool cm_req_has_alt_path(struct cm_req_msg *req_msg) +{ + return ((cpu_to_be16( + IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) || + (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, + req_msg)))); +} + +static void cm_path_set_rec_type(struct ib_device *ib_device, u8 port_num, + struct sa_path_rec *path, union ib_gid *gid) +{ + if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num)) + path->rec_type = SA_PATH_REC_TYPE_OPA; + else + path->rec_type = SA_PATH_REC_TYPE_IB; +} + +static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg, + struct sa_path_rec *primary_path, + struct sa_path_rec *alt_path, + struct ib_wc *wc) +{ + u32 lid; + + if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) { + sa_path_set_dlid(primary_path, wc->slid); + sa_path_set_slid(primary_path, + IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, + req_msg)); + } else { + lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( + CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)); + sa_path_set_dlid(primary_path, lid); + + lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( + CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)); + sa_path_set_slid(primary_path, lid); + } + + if (!cm_req_has_alt_path(req_msg)) + return; + + if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) { + sa_path_set_dlid(alt_path, + IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, + req_msg)); + sa_path_set_slid(alt_path, + IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, + req_msg)); + } else { + lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( + CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg)); + sa_path_set_dlid(alt_path, lid); + + lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( + CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg)); + sa_path_set_slid(alt_path, lid); + } +} + +static void cm_format_paths_from_req(struct cm_req_msg *req_msg, + struct sa_path_rec *primary_path, + struct sa_path_rec *alt_path, + struct ib_wc *wc) +{ + primary_path->dgid = + *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg); + primary_path->sgid = + *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg); + primary_path->flow_label = + cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg)); + primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg); + primary_path->traffic_class = + IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg); + primary_path->reversible = 1; + primary_path->pkey = + cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); + primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg); + primary_path->mtu_selector = IB_SA_EQ; + primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); + primary_path->rate_selector = IB_SA_EQ; + primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg); + primary_path->packet_life_time_selector = IB_SA_EQ; + primary_path->packet_life_time = + IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg); + primary_path->packet_life_time -= (primary_path->packet_life_time > 0); + primary_path->service_id = + cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); + if (sa_path_is_roce(primary_path)) + primary_path->roce.route_resolved = false; + + if (cm_req_has_alt_path(req_msg)) { + alt_path->dgid = *IBA_GET_MEM_PTR( + CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg); + alt_path->sgid = *IBA_GET_MEM_PTR( + CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg); + alt_path->flow_label = cpu_to_be32( + IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg)); + alt_path->hop_limit = + IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg); + alt_path->traffic_class = + IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg); + alt_path->reversible = 1; + alt_path->pkey = + cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); + alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg); + alt_path->mtu_selector = IB_SA_EQ; + alt_path->mtu = + IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); + alt_path->rate_selector = IB_SA_EQ; + alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg); + alt_path->packet_life_time_selector = IB_SA_EQ; + alt_path->packet_life_time = + IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg); + alt_path->packet_life_time -= (alt_path->packet_life_time > 0); + alt_path->service_id = + cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); + + if (sa_path_is_roce(alt_path)) + alt_path->roce.route_resolved = false; + } + cm_format_path_lid_from_req(req_msg, primary_path, alt_path, wc); +} + +static u16 cm_get_bth_pkey(struct cm_work *work) +{ + struct ib_device *ib_dev = work->port->cm_dev->ib_device; + u8 port_num = work->port->port_num; + u16 pkey_index = work->mad_recv_wc->wc->pkey_index; + u16 pkey; + int ret; + + ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); + if (ret) { + dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n", + port_num, pkey_index, ret); + return 0; + } + + return pkey; +} + +/** + * Convert OPA SGID to IB SGID + * ULPs (such as IPoIB) do not understand OPA GIDs and will + * reject them as the local_gid will not match the sgid. Therefore, + * change the pathrec's SGID to an IB SGID. + * + * @work: Work completion + * @path: Path record + */ +static void cm_opa_to_ib_sgid(struct cm_work *work, + struct sa_path_rec *path) +{ + struct ib_device *dev = work->port->cm_dev->ib_device; + u8 port_num = work->port->port_num; + + if (rdma_cap_opa_ah(dev, port_num) && + (ib_is_opa_gid(&path->sgid))) { + union ib_gid sgid; + + if (rdma_query_gid(dev, port_num, 0, &sgid)) { + dev_warn(&dev->dev, + "Error updating sgid in CM request\n"); + return; + } + + path->sgid = sgid; + } +} + +static void cm_format_req_event(struct cm_work *work, + struct cm_id_private *cm_id_priv, + struct ib_cm_id *listen_id) +{ + struct cm_req_msg *req_msg; + struct ib_cm_req_event_param *param; + + req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; + param = &work->cm_event.param.req_rcvd; + param->listen_id = listen_id; + param->bth_pkey = cm_get_bth_pkey(work); + param->port = cm_id_priv->av.port->port_num; + param->primary_path = &work->path[0]; + cm_opa_to_ib_sgid(work, param->primary_path); + if (cm_req_has_alt_path(req_msg)) { + param->alternate_path = &work->path[1]; + cm_opa_to_ib_sgid(work, param->alternate_path); + } else { + param->alternate_path = NULL; + } + param->remote_ca_guid = + cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); + param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg); + param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg); + param->qp_type = cm_req_get_qp_type(req_msg); + param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg); + param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); + param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); + param->local_cm_response_timeout = + IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg); + param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg); + param->remote_cm_response_timeout = + IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg); + param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); + param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); + param->srq = IBA_GET(CM_REQ_SRQ, req_msg); + param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; + param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg); + param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod); + + work->cm_event.private_data = + IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg); +} + +static void cm_process_work(struct cm_id_private *cm_id_priv, + struct cm_work *work) +{ + int ret; + + /* We will typically only have the current event to report. */ + ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); + cm_free_work(work); + + while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { + spin_lock_irq(&cm_id_priv->lock); + work = cm_dequeue_work(cm_id_priv); + spin_unlock_irq(&cm_id_priv->lock); + if (!work) + return; + + ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, + &work->cm_event); + cm_free_work(work); + } + cm_deref_id(cm_id_priv); + if (ret) + cm_destroy_id(&cm_id_priv->id, ret); +} + +static void cm_format_mra(struct cm_mra_msg *mra_msg, + struct cm_id_private *cm_id_priv, + enum cm_msg_response msg_mraed, u8 service_timeout, + const void *private_data, u8 private_data_len) +{ + cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); + IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed); + IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg, + be32_to_cpu(cm_id_priv->id.local_id)); + IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg, + be32_to_cpu(cm_id_priv->id.remote_id)); + IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, service_timeout); + + if (private_data && private_data_len) + IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data, + private_data_len); +} + +static void cm_format_rej(struct cm_rej_msg *rej_msg, + struct cm_id_private *cm_id_priv, + enum ib_cm_rej_reason reason, void *ari, + u8 ari_length, const void *private_data, + u8 private_data_len, enum ib_cm_state state) +{ + lockdep_assert_held(&cm_id_priv->lock); + + cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); + IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg, + be32_to_cpu(cm_id_priv->id.remote_id)); + + switch (state) { + case IB_CM_REQ_RCVD: + IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0)); + IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); + break; + case IB_CM_MRA_REQ_SENT: + IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, + be32_to_cpu(cm_id_priv->id.local_id)); + IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ); + break; + case IB_CM_REP_RCVD: + case IB_CM_MRA_REP_SENT: + IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, + be32_to_cpu(cm_id_priv->id.local_id)); + IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP); + break; + default: + IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, + be32_to_cpu(cm_id_priv->id.local_id)); + IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, + CM_MSG_RESPONSE_OTHER); + break; + } + + IBA_SET(CM_REJ_REASON, rej_msg, reason); + if (ari && ari_length) { + IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length); + IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length); + } + + if (private_data && private_data_len) + IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data, + private_data_len); +} + +static void cm_dup_req_handler(struct cm_work *work, + struct cm_id_private *cm_id_priv) +{ + struct ib_mad_send_buf *msg = NULL; + int ret; + + atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. + counter[CM_REQ_COUNTER]); + + /* Quick state check to discard duplicate REQs. */ + spin_lock_irq(&cm_id_priv->lock); + if (cm_id_priv->id.state == IB_CM_REQ_RCVD) { + spin_unlock_irq(&cm_id_priv->lock); + return; + } + spin_unlock_irq(&cm_id_priv->lock); + + ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); + if (ret) + return; + + spin_lock_irq(&cm_id_priv->lock); + switch (cm_id_priv->id.state) { + case IB_CM_MRA_REQ_SENT: + cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, + CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, + cm_id_priv->private_data, + cm_id_priv->private_data_len); + break; + case IB_CM_TIMEWAIT: + cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, + IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0, + IB_CM_TIMEWAIT); + break; + default: + goto unlock; + } + spin_unlock_irq(&cm_id_priv->lock); + + trace_icm_send_dup_req(&cm_id_priv->id); + ret = ib_post_send_mad(msg, NULL); + if (ret) + goto free; + return; + +unlock: spin_unlock_irq(&cm_id_priv->lock); +free: cm_free_msg(msg); +} + +static struct cm_id_private * cm_match_req(struct cm_work *work, + struct cm_id_private *cm_id_priv) +{ + struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; + struct cm_timewait_info *timewait_info; + struct cm_req_msg *req_msg; + + req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; + + /* Check for possible duplicate REQ. */ + spin_lock_irq(&cm.lock); + timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); + if (timewait_info) { + cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, + timewait_info->work.remote_id); + spin_unlock_irq(&cm.lock); + if (cur_cm_id_priv) { + cm_dup_req_handler(work, cur_cm_id_priv); + cm_deref_id(cur_cm_id_priv); + } + return NULL; + } + + /* Check for stale connections. */ + timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); + if (timewait_info) { + cm_remove_remote(cm_id_priv); + cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, + timewait_info->work.remote_id); + + spin_unlock_irq(&cm.lock); + cm_issue_rej(work->port, work->mad_recv_wc, + IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, + NULL, 0); + if (cur_cm_id_priv) { + ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); + cm_deref_id(cur_cm_id_priv); + } + return NULL; + } + + /* Find matching listen request. */ + listen_cm_id_priv = cm_find_listen( + cm_id_priv->id.device, + cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg))); + if (!listen_cm_id_priv) { + cm_remove_remote(cm_id_priv); + spin_unlock_irq(&cm.lock); + cm_issue_rej(work->port, work->mad_recv_wc, + IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, + NULL, 0); + return NULL; + } + spin_unlock_irq(&cm.lock); + return listen_cm_id_priv; +} + +/* + * Work-around for inter-subnet connections. If the LIDs are permissive, + * we need to override the LID/SL data in the REQ with the LID information + * in the work completion. + */ +static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) +{ + if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) { + if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, + req_msg)) == IB_LID_PERMISSIVE) { + IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg, + be16_to_cpu(ib_lid_be16(wc->slid))); + IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl); + } + + if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID, + req_msg)) == IB_LID_PERMISSIVE) + IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg, + wc->dlid_path_bits); + } + + if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) { + if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, + req_msg)) == IB_LID_PERMISSIVE) { + IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg, + be16_to_cpu(ib_lid_be16(wc->slid))); + IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl); + } + + if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, + req_msg)) == IB_LID_PERMISSIVE) + IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg, + wc->dlid_path_bits); + } +} + +static int cm_req_handler(struct cm_work *work) +{ + struct cm_id_private *cm_id_priv, *listen_cm_id_priv; + struct cm_req_msg *req_msg; + const struct ib_global_route *grh; + const struct ib_gid_attr *gid_attr; + int ret; + + req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; + + cm_id_priv = + cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); + if (IS_ERR(cm_id_priv)) + return PTR_ERR(cm_id_priv); + + cm_id_priv->id.remote_id = + cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg)); + cm_id_priv->id.service_id = + cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)); + cm_id_priv->id.service_mask = ~cpu_to_be64(0); + cm_id_priv->tid = req_msg->hdr.tid; + cm_id_priv->timeout_ms = cm_convert_to_ms( + IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg)); + cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg); + cm_id_priv->remote_qpn = + cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg)); + cm_id_priv->initiator_depth = + IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg); + cm_id_priv->responder_resources = + IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg); + cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg); + cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg)); + cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg)); + cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg); + cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg); + cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); + + ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, + work->mad_recv_wc->recv_buf.grh, + &cm_id_priv->av); + if (ret) + goto destroy; + cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> + id.local_id); + if (IS_ERR(cm_id_priv->timewait_info)) { + ret = PTR_ERR(cm_id_priv->timewait_info); + cm_id_priv->timewait_info = NULL; + goto destroy; + } + cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id; + cm_id_priv->timewait_info->remote_ca_guid = + cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg)); + cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn; + + /* + * Note that the ID pointer is not in the xarray at this point, + * so this set is only visible to the local thread. + */ + cm_id_priv->id.state = IB_CM_REQ_RCVD; + + listen_cm_id_priv = cm_match_req(work, cm_id_priv); + if (!listen_cm_id_priv) { + trace_icm_no_listener_err(&cm_id_priv->id); + cm_id_priv->id.state = IB_CM_IDLE; + ret = -EINVAL; + goto destroy; + } + + if (cm_id_priv->av.ah_attr.type != RDMA_AH_ATTR_TYPE_ROCE) + cm_process_routed_req(req_msg, work->mad_recv_wc->wc); + + memset(&work->path[0], 0, sizeof(work->path[0])); + if (cm_req_has_alt_path(req_msg)) + memset(&work->path[1], 0, sizeof(work->path[1])); + grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr); + gid_attr = grh->sgid_attr; + + if (gid_attr && + rdma_protocol_roce(work->port->cm_dev->ib_device, + work->port->port_num)) { + work->path[0].rec_type = + sa_conv_gid_to_pathrec_type(gid_attr->gid_type); + } else { + cm_path_set_rec_type( + work->port->cm_dev->ib_device, work->port->port_num, + &work->path[0], + IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, + req_msg)); + } + if (cm_req_has_alt_path(req_msg)) + work->path[1].rec_type = work->path[0].rec_type; + cm_format_paths_from_req(req_msg, &work->path[0], + &work->path[1], work->mad_recv_wc->wc); + if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) + sa_path_set_dmac(&work->path[0], + cm_id_priv->av.ah_attr.roce.dmac); + work->path[0].hop_limit = grh->hop_limit; + ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av, + cm_id_priv); + if (ret) { + int err; + + err = rdma_query_gid(work->port->cm_dev->ib_device, + work->port->port_num, 0, + &work->path[0].sgid); + if (err) + ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, + NULL, 0, NULL, 0); + else + ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID, + &work->path[0].sgid, + sizeof(work->path[0].sgid), + NULL, 0); + goto rejected; + } + if (cm_req_has_alt_path(req_msg)) { + ret = cm_init_av_by_path(&work->path[1], NULL, + &cm_id_priv->alt_av, cm_id_priv); + if (ret) { + ib_send_cm_rej(&cm_id_priv->id, + IB_CM_REJ_INVALID_ALT_GID, + &work->path[0].sgid, + sizeof(work->path[0].sgid), NULL, 0); + goto rejected; + } + } + + cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; + cm_id_priv->id.context = listen_cm_id_priv->id.context; + cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); + + /* Now MAD handlers can see the new ID */ + spin_lock_irq(&cm_id_priv->lock); + cm_finalize_id(cm_id_priv); + + /* Refcount belongs to the event, pairs with cm_process_work() */ + refcount_inc(&cm_id_priv->refcount); + cm_queue_work_unlock(cm_id_priv, work); + /* + * Since this ID was just created and was not made visible to other MAD + * handlers until the cm_finalize_id() above we know that the + * cm_process_work() will deliver the event and the listen_cm_id + * embedded in the event can be derefed here. + */ + cm_deref_id(listen_cm_id_priv); + return 0; + +rejected: + cm_deref_id(listen_cm_id_priv); +destroy: + ib_destroy_cm_id(&cm_id_priv->id); + return ret; +} + +static void cm_format_rep(struct cm_rep_msg *rep_msg, + struct cm_id_private *cm_id_priv, + struct ib_cm_rep_param *param) +{ + cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid, + param->ece.attr_mod); + IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg, + be32_to_cpu(cm_id_priv->id.local_id)); + IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg, + be32_to_cpu(cm_id_priv->id.remote_id)); + IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn); + IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg, + param->responder_resources); + IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg, + cm_id_priv->av.port->cm_dev->ack_delay); + IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted); + IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count); + IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg, + be64_to_cpu(cm_id_priv->id.device->node_guid)); + + if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { + IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg, + param->initiator_depth); + IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg, + param->flow_control); + IBA_SET(CM_REP_SRQ, rep_msg, param->srq); + IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num); + } else { + IBA_SET(CM_REP_SRQ, rep_msg, 1); + IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num); + } + + IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id); + IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8); + IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16); + + if (param->private_data && param->private_data_len) + IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data, + param->private_data_len); +} + +int ib_send_cm_rep(struct ib_cm_id *cm_id, + struct ib_cm_rep_param *param) +{ + struct cm_id_private *cm_id_priv; + struct ib_mad_send_buf *msg; + struct cm_rep_msg *rep_msg; + unsigned long flags; + int ret; + + if (param->private_data && + param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) + return -EINVAL; + + cm_id_priv = container_of(cm_id, struct cm_id_private, id); + spin_lock_irqsave(&cm_id_priv->lock, flags); + if (cm_id->state != IB_CM_REQ_RCVD && + cm_id->state != IB_CM_MRA_REQ_SENT) { + trace_icm_send_rep_err(cm_id_priv->id.local_id, cm_id->state); + ret = -EINVAL; + goto out; + } + + ret = cm_alloc_msg(cm_id_priv, &msg); + if (ret) + goto out; + + rep_msg = (struct cm_rep_msg *) msg->mad; + cm_format_rep(rep_msg, cm_id_priv, param); + msg->timeout_ms = cm_id_priv->timeout_ms; + msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; + + trace_icm_send_rep(cm_id); + ret = ib_post_send_mad(msg, NULL); + if (ret) { + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + cm_free_msg(msg); + return ret; + } + + cm_id->state = IB_CM_REP_SENT; + cm_id_priv->msg = msg; + cm_id_priv->initiator_depth = param->initiator_depth; + cm_id_priv->responder_resources = param->responder_resources; + cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); + WARN_ONCE(param->qp_num & 0xFF000000, + "IBTA declares QPN to be 24 bits, but it is 0x%X\n", + param->qp_num); + cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); + +out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); + return ret; +} +EXPORT_SYMBOL(ib_send_cm_rep); + +static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, + struct cm_id_private *cm_id_priv, + const void *private_data, + u8 private_data_len) +{ + cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); + IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg, + be32_to_cpu(cm_id_priv->id.local_id)); + IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg, + be32_to_cpu(cm_id_priv->id.remote_id)); + + if (private_data && private_data_len) + IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data, + private_data_len); +} + +int ib_send_cm_rtu(struct ib_cm_id *cm_id, + const void *private_data, + u8 private_data_len) +{ + struct cm_id_private *cm_id_priv; + struct ib_mad_send_buf *msg; + unsigned long flags; + void *data; + int ret; + + if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) + return -EINVAL; + + data = cm_copy_private_data(private_data, private_data_len); + if (IS_ERR(data)) + return PTR_ERR(data); + + cm_id_priv = container_of(cm_id, struct cm_id_private, id); + spin_lock_irqsave(&cm_id_priv->lock, flags); + if (cm_id->state != IB_CM_REP_RCVD && + cm_id->state != IB_CM_MRA_REP_SENT) { + trace_icm_send_cm_rtu_err(cm_id); + ret = -EINVAL; + goto error; + } + + ret = cm_alloc_msg(cm_id_priv, &msg); + if (ret) + goto error; + + cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, + private_data, private_data_len); + + trace_icm_send_rtu(cm_id); + ret = ib_post_send_mad(msg, NULL); + if (ret) { + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + cm_free_msg(msg); + kfree(data); + return ret; + } + + cm_id->state = IB_CM_ESTABLISHED; + cm_set_private_data(cm_id_priv, data, private_data_len); + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + return 0; + +error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); + kfree(data); + return ret; +} +EXPORT_SYMBOL(ib_send_cm_rtu); + +static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) +{ + struct cm_rep_msg *rep_msg; + struct ib_cm_rep_event_param *param; + + rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; + param = &work->cm_event.param.rep_rcvd; + param->remote_ca_guid = + cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); + param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg); + param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); + param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg); + param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); + param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); + param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); + param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg); + param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg); + param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); + param->srq = IBA_GET(CM_REP_SRQ, rep_msg); + param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16; + param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8; + param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg); + param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod); + + work->cm_event.private_data = + IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg); +} + +static void cm_dup_rep_handler(struct cm_work *work) +{ + struct cm_id_private *cm_id_priv; + struct cm_rep_msg *rep_msg; + struct ib_mad_send_buf *msg = NULL; + int ret; + + rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; + cm_id_priv = cm_acquire_id( + cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), + cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg))); + if (!cm_id_priv) + return; + + atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. + counter[CM_REP_COUNTER]); + ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); + if (ret) + goto deref; + + spin_lock_irq(&cm_id_priv->lock); + if (cm_id_priv->id.state == IB_CM_ESTABLISHED) + cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, + cm_id_priv->private_data, + cm_id_priv->private_data_len); + else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) + cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, + CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, + cm_id_priv->private_data, + cm_id_priv->private_data_len); + else + goto unlock; + spin_unlock_irq(&cm_id_priv->lock); + + trace_icm_send_dup_rep(&cm_id_priv->id); + ret = ib_post_send_mad(msg, NULL); + if (ret) + goto free; + goto deref; + +unlock: spin_unlock_irq(&cm_id_priv->lock); +free: cm_free_msg(msg); +deref: cm_deref_id(cm_id_priv); +} + +static int cm_rep_handler(struct cm_work *work) +{ + struct cm_id_private *cm_id_priv; + struct cm_rep_msg *rep_msg; + int ret; + struct cm_id_private *cur_cm_id_priv; + struct cm_timewait_info *timewait_info; + + rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; + cm_id_priv = cm_acquire_id( + cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0); + if (!cm_id_priv) { + cm_dup_rep_handler(work); + trace_icm_remote_no_priv_err( + IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); + return -EINVAL; + } + + cm_format_rep_event(work, cm_id_priv->qp_type); + + spin_lock_irq(&cm_id_priv->lock); + switch (cm_id_priv->id.state) { + case IB_CM_REQ_SENT: + case IB_CM_MRA_REQ_RCVD: + break; + default: + ret = -EINVAL; + trace_icm_rep_unknown_err( + IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), + IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg), + cm_id_priv->id.state); + spin_unlock_irq(&cm_id_priv->lock); + goto error; + } + + cm_id_priv->timewait_info->work.remote_id = + cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); + cm_id_priv->timewait_info->remote_ca_guid = + cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg)); + cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); + + spin_lock(&cm.lock); + /* Check for duplicate REP. */ + if (cm_insert_remote_id(cm_id_priv->timewait_info)) { + spin_unlock(&cm.lock); + spin_unlock_irq(&cm_id_priv->lock); + ret = -EINVAL; + trace_icm_insert_failed_err( + IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); + goto error; + } + /* Check for a stale connection. */ + timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); + if (timewait_info) { + cm_remove_remote(cm_id_priv); + cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id, + timewait_info->work.remote_id); + + spin_unlock(&cm.lock); + spin_unlock_irq(&cm_id_priv->lock); + cm_issue_rej(work->port, work->mad_recv_wc, + IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, + NULL, 0); + ret = -EINVAL; + trace_icm_staleconn_err( + IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg), + IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)); + + if (cur_cm_id_priv) { + ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0); + cm_deref_id(cur_cm_id_priv); + } + + goto error; + } + spin_unlock(&cm.lock); + + cm_id_priv->id.state = IB_CM_REP_RCVD; + cm_id_priv->id.remote_id = + cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)); + cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); + cm_id_priv->initiator_depth = + IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg); + cm_id_priv->responder_resources = + IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg); + cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg)); + cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg); + cm_id_priv->target_ack_delay = + IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg); + cm_id_priv->av.timeout = + cm_ack_timeout(cm_id_priv->target_ack_delay, + cm_id_priv->av.timeout - 1); + cm_id_priv->alt_av.timeout = + cm_ack_timeout(cm_id_priv->target_ack_delay, + cm_id_priv->alt_av.timeout - 1); + + ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); + cm_queue_work_unlock(cm_id_priv, work); + return 0; + +error: + cm_deref_id(cm_id_priv); + return ret; +} + +static int cm_establish_handler(struct cm_work *work) +{ + struct cm_id_private *cm_id_priv; + + /* See comment in cm_establish about lookup. */ + cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); + if (!cm_id_priv) + return -EINVAL; + + spin_lock_irq(&cm_id_priv->lock); + if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { + spin_unlock_irq(&cm_id_priv->lock); + goto out; + } + + ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); + cm_queue_work_unlock(cm_id_priv, work); + return 0; +out: + cm_deref_id(cm_id_priv); + return -EINVAL; +} + +static int cm_rtu_handler(struct cm_work *work) +{ + struct cm_id_private *cm_id_priv; + struct cm_rtu_msg *rtu_msg; + + rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; + cm_id_priv = cm_acquire_id( + cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)), + cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg))); + if (!cm_id_priv) + return -EINVAL; + + work->cm_event.private_data = + IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg); + + spin_lock_irq(&cm_id_priv->lock); + if (cm_id_priv->id.state != IB_CM_REP_SENT && + cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { + spin_unlock_irq(&cm_id_priv->lock); + atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. + counter[CM_RTU_COUNTER]); + goto out; + } + cm_id_priv->id.state = IB_CM_ESTABLISHED; + + ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); + cm_queue_work_unlock(cm_id_priv, work); + return 0; +out: + cm_deref_id(cm_id_priv); + return -EINVAL; +} + +static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, + struct cm_id_private *cm_id_priv, + const void *private_data, + u8 private_data_len) +{ + cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, + cm_form_tid(cm_id_priv)); + IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg, + be32_to_cpu(cm_id_priv->id.local_id)); + IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg, + be32_to_cpu(cm_id_priv->id.remote_id)); + IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg, + be32_to_cpu(cm_id_priv->remote_qpn)); + + if (private_data && private_data_len) + IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data, + private_data_len); +} + +static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv, + const void *private_data, u8 private_data_len) +{ + struct ib_mad_send_buf *msg; + int ret; + + lockdep_assert_held(&cm_id_priv->lock); + + if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) + return -EINVAL; + + if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { + trace_icm_dreq_skipped(&cm_id_priv->id); + return -EINVAL; + } + + if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || + cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) + ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); + + ret = cm_alloc_msg(cm_id_priv, &msg); + if (ret) { + cm_enter_timewait(cm_id_priv); + return ret; + } + + cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, + private_data, private_data_len); + msg->timeout_ms = cm_id_priv->timeout_ms; + msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; + + trace_icm_send_dreq(&cm_id_priv->id); + ret = ib_post_send_mad(msg, NULL); + if (ret) { + cm_enter_timewait(cm_id_priv); + cm_free_msg(msg); + return ret; + } + + cm_id_priv->id.state = IB_CM_DREQ_SENT; + cm_id_priv->msg = msg; + return 0; +} + +int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data, + u8 private_data_len) +{ + struct cm_id_private *cm_id_priv = + container_of(cm_id, struct cm_id_private, id); + unsigned long flags; + int ret; + + spin_lock_irqsave(&cm_id_priv->lock, flags); + ret = cm_send_dreq_locked(cm_id_priv, private_data, private_data_len); + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + return ret; +} +EXPORT_SYMBOL(ib_send_cm_dreq); + +static void cm_format_drep(struct cm_drep_msg *drep_msg, + struct cm_id_private *cm_id_priv, + const void *private_data, + u8 private_data_len) +{ + cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); + IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, + be32_to_cpu(cm_id_priv->id.local_id)); + IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, + be32_to_cpu(cm_id_priv->id.remote_id)); + + if (private_data && private_data_len) + IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data, + private_data_len); +} + +static int cm_send_drep_locked(struct cm_id_private *cm_id_priv, + void *private_data, u8 private_data_len) +{ + struct ib_mad_send_buf *msg; + int ret; + + lockdep_assert_held(&cm_id_priv->lock); + + if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) + return -EINVAL; + + if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) { + trace_icm_send_drep_err(&cm_id_priv->id); + kfree(private_data); + return -EINVAL; + } + + cm_set_private_data(cm_id_priv, private_data, private_data_len); + cm_enter_timewait(cm_id_priv); + + ret = cm_alloc_msg(cm_id_priv, &msg); + if (ret) + return ret; + + cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, + private_data, private_data_len); + + trace_icm_send_drep(&cm_id_priv->id); + ret = ib_post_send_mad(msg, NULL); + if (ret) { + cm_free_msg(msg); + return ret; + } + return 0; +} + +int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data, + u8 private_data_len) +{ + struct cm_id_private *cm_id_priv = + container_of(cm_id, struct cm_id_private, id); + unsigned long flags; + void *data; + int ret; + + data = cm_copy_private_data(private_data, private_data_len); + if (IS_ERR(data)) + return PTR_ERR(data); + + spin_lock_irqsave(&cm_id_priv->lock, flags); + ret = cm_send_drep_locked(cm_id_priv, data, private_data_len); + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + return ret; +} +EXPORT_SYMBOL(ib_send_cm_drep); + +static int cm_issue_drep(struct cm_port *port, + struct ib_mad_recv_wc *mad_recv_wc) +{ + struct ib_mad_send_buf *msg = NULL; + struct cm_dreq_msg *dreq_msg; + struct cm_drep_msg *drep_msg; + int ret; + + ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); + if (ret) + return ret; + + dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; + drep_msg = (struct cm_drep_msg *) msg->mad; + + cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); + IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg, + IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)); + IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg, + IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); + + trace_icm_issue_drep( + IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg), + IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); + ret = ib_post_send_mad(msg, NULL); + if (ret) + cm_free_msg(msg); + + return ret; +} + +static int cm_dreq_handler(struct cm_work *work) +{ + struct cm_id_private *cm_id_priv; + struct cm_dreq_msg *dreq_msg; + struct ib_mad_send_buf *msg = NULL; + + dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; + cm_id_priv = cm_acquire_id( + cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)), + cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg))); + if (!cm_id_priv) { + atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. + counter[CM_DREQ_COUNTER]); + cm_issue_drep(work->port, work->mad_recv_wc); + trace_icm_no_priv_err( + IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg), + IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)); + return -EINVAL; + } + + work->cm_event.private_data = + IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg); + + spin_lock_irq(&cm_id_priv->lock); + if (cm_id_priv->local_qpn != + cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg))) + goto unlock; + + switch (cm_id_priv->id.state) { + case IB_CM_REP_SENT: + case IB_CM_DREQ_SENT: + ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); + break; + case IB_CM_ESTABLISHED: + if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || + cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) + ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); + break; + case IB_CM_MRA_REP_RCVD: + break; + case IB_CM_TIMEWAIT: + atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. + counter[CM_DREQ_COUNTER]); + msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); + if (IS_ERR(msg)) + goto unlock; + + cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, + cm_id_priv->private_data, + cm_id_priv->private_data_len); + spin_unlock_irq(&cm_id_priv->lock); + + if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || + ib_post_send_mad(msg, NULL)) + cm_free_msg(msg); + goto deref; + case IB_CM_DREQ_RCVD: + atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. + counter[CM_DREQ_COUNTER]); + goto unlock; + default: + trace_icm_dreq_unknown_err(&cm_id_priv->id); + goto unlock; + } + cm_id_priv->id.state = IB_CM_DREQ_RCVD; + cm_id_priv->tid = dreq_msg->hdr.tid; + cm_queue_work_unlock(cm_id_priv, work); + return 0; + +unlock: spin_unlock_irq(&cm_id_priv->lock); +deref: cm_deref_id(cm_id_priv); + return -EINVAL; +} + +static int cm_drep_handler(struct cm_work *work) +{ + struct cm_id_private *cm_id_priv; + struct cm_drep_msg *drep_msg; + + drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; + cm_id_priv = cm_acquire_id( + cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)), + cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg))); + if (!cm_id_priv) + return -EINVAL; + + work->cm_event.private_data = + IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg); + + spin_lock_irq(&cm_id_priv->lock); + if (cm_id_priv->id.state != IB_CM_DREQ_SENT && + cm_id_priv->id.state != IB_CM_DREQ_RCVD) { + spin_unlock_irq(&cm_id_priv->lock); + goto out; + } + cm_enter_timewait(cm_id_priv); + + ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); + cm_queue_work_unlock(cm_id_priv, work); + return 0; +out: + cm_deref_id(cm_id_priv); + return -EINVAL; +} + +static int cm_send_rej_locked(struct cm_id_private *cm_id_priv, + enum ib_cm_rej_reason reason, void *ari, + u8 ari_length, const void *private_data, + u8 private_data_len) +{ + enum ib_cm_state state = cm_id_priv->id.state; + struct ib_mad_send_buf *msg; + int ret; + + lockdep_assert_held(&cm_id_priv->lock); + + if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || + (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) + return -EINVAL; + + trace_icm_send_rej(&cm_id_priv->id, reason); + + switch (state) { + case IB_CM_REQ_SENT: + case IB_CM_MRA_REQ_RCVD: + case IB_CM_REQ_RCVD: + case IB_CM_MRA_REQ_SENT: + case IB_CM_REP_RCVD: + case IB_CM_MRA_REP_SENT: + cm_reset_to_idle(cm_id_priv); + ret = cm_alloc_msg(cm_id_priv, &msg); + if (ret) + return ret; + cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, + ari, ari_length, private_data, private_data_len, + state); + break; + case IB_CM_REP_SENT: + case IB_CM_MRA_REP_RCVD: + cm_enter_timewait(cm_id_priv); + ret = cm_alloc_msg(cm_id_priv, &msg); + if (ret) + return ret; + cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason, + ari, ari_length, private_data, private_data_len, + state); + break; + default: + trace_icm_send_unknown_rej_err(&cm_id_priv->id); + return -EINVAL; + } + + ret = ib_post_send_mad(msg, NULL); + if (ret) { + cm_free_msg(msg); + return ret; + } + + return 0; +} + +int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason, + void *ari, u8 ari_length, const void *private_data, + u8 private_data_len) +{ + struct cm_id_private *cm_id_priv = + container_of(cm_id, struct cm_id_private, id); + unsigned long flags; + int ret; + + spin_lock_irqsave(&cm_id_priv->lock, flags); + ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length, + private_data, private_data_len); + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + return ret; +} +EXPORT_SYMBOL(ib_send_cm_rej); + +static void cm_format_rej_event(struct cm_work *work) +{ + struct cm_rej_msg *rej_msg; + struct ib_cm_rej_event_param *param; + + rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; + param = &work->cm_event.param.rej_rcvd; + param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg); + param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg); + param->reason = IBA_GET(CM_REJ_REASON, rej_msg); + work->cm_event.private_data = + IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg); +} + +static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) +{ + struct cm_id_private *cm_id_priv; + __be32 remote_id; + + remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg)); + + if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) { + cm_id_priv = cm_find_remote_id( + *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)), + remote_id); + } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) == + CM_MSG_RESPONSE_REQ) + cm_id_priv = cm_acquire_id( + cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), + 0); + else + cm_id_priv = cm_acquire_id( + cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)), + remote_id); + + return cm_id_priv; +} + +static int cm_rej_handler(struct cm_work *work) +{ + struct cm_id_private *cm_id_priv; + struct cm_rej_msg *rej_msg; + + rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; + cm_id_priv = cm_acquire_rejected_id(rej_msg); + if (!cm_id_priv) + return -EINVAL; + + cm_format_rej_event(work); + + spin_lock_irq(&cm_id_priv->lock); + switch (cm_id_priv->id.state) { + case IB_CM_REQ_SENT: + case IB_CM_MRA_REQ_RCVD: + case IB_CM_REP_SENT: + case IB_CM_MRA_REP_RCVD: + ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); + fallthrough; + case IB_CM_REQ_RCVD: + case IB_CM_MRA_REQ_SENT: + if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN) + cm_enter_timewait(cm_id_priv); + else + cm_reset_to_idle(cm_id_priv); + break; + case IB_CM_DREQ_SENT: + ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); + fallthrough; + case IB_CM_REP_RCVD: + case IB_CM_MRA_REP_SENT: + cm_enter_timewait(cm_id_priv); + break; + case IB_CM_ESTABLISHED: + if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || + cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { + if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) + ib_cancel_mad(cm_id_priv->av.port->mad_agent, + cm_id_priv->msg); + cm_enter_timewait(cm_id_priv); + break; + } + fallthrough; + default: + trace_icm_rej_unknown_err(&cm_id_priv->id); + spin_unlock_irq(&cm_id_priv->lock); + goto out; + } + + cm_queue_work_unlock(cm_id_priv, work); + return 0; +out: + cm_deref_id(cm_id_priv); + return -EINVAL; +} + +int ib_send_cm_mra(struct ib_cm_id *cm_id, + u8 service_timeout, + const void *private_data, + u8 private_data_len) +{ + struct cm_id_private *cm_id_priv; + struct ib_mad_send_buf *msg; + enum ib_cm_state cm_state; + enum ib_cm_lap_state lap_state; + enum cm_msg_response msg_response; + void *data; + unsigned long flags; + int ret; + + if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) + return -EINVAL; + + data = cm_copy_private_data(private_data, private_data_len); + if (IS_ERR(data)) + return PTR_ERR(data); + + cm_id_priv = container_of(cm_id, struct cm_id_private, id); + + spin_lock_irqsave(&cm_id_priv->lock, flags); + switch(cm_id_priv->id.state) { + case IB_CM_REQ_RCVD: + cm_state = IB_CM_MRA_REQ_SENT; + lap_state = cm_id->lap_state; + msg_response = CM_MSG_RESPONSE_REQ; + break; + case IB_CM_REP_RCVD: + cm_state = IB_CM_MRA_REP_SENT; + lap_state = cm_id->lap_state; + msg_response = CM_MSG_RESPONSE_REP; + break; + case IB_CM_ESTABLISHED: + if (cm_id->lap_state == IB_CM_LAP_RCVD) { + cm_state = cm_id->state; + lap_state = IB_CM_MRA_LAP_SENT; + msg_response = CM_MSG_RESPONSE_OTHER; + break; + } + fallthrough; + default: + trace_icm_send_mra_unknown_err(&cm_id_priv->id); + ret = -EINVAL; + goto error1; + } + + if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { + ret = cm_alloc_msg(cm_id_priv, &msg); + if (ret) + goto error1; + + cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, + msg_response, service_timeout, + private_data, private_data_len); + trace_icm_send_mra(cm_id); + ret = ib_post_send_mad(msg, NULL); + if (ret) + goto error2; + } + + cm_id->state = cm_state; + cm_id->lap_state = lap_state; + cm_id_priv->service_timeout = service_timeout; + cm_set_private_data(cm_id_priv, data, private_data_len); + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + return 0; + +error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); + kfree(data); + return ret; + +error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); + kfree(data); + cm_free_msg(msg); + return ret; +} +EXPORT_SYMBOL(ib_send_cm_mra); + +static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) +{ + switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) { + case CM_MSG_RESPONSE_REQ: + return cm_acquire_id( + cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), + 0); + case CM_MSG_RESPONSE_REP: + case CM_MSG_RESPONSE_OTHER: + return cm_acquire_id( + cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)), + cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg))); + default: + return NULL; + } +} + +static int cm_mra_handler(struct cm_work *work) +{ + struct cm_id_private *cm_id_priv; + struct cm_mra_msg *mra_msg; + int timeout; + + mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; + cm_id_priv = cm_acquire_mraed_id(mra_msg); + if (!cm_id_priv) + return -EINVAL; + + work->cm_event.private_data = + IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg); + work->cm_event.param.mra_rcvd.service_timeout = + IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg); + timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) + + cm_convert_to_ms(cm_id_priv->av.timeout); + + spin_lock_irq(&cm_id_priv->lock); + switch (cm_id_priv->id.state) { + case IB_CM_REQ_SENT: + if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != + CM_MSG_RESPONSE_REQ || + ib_modify_mad(cm_id_priv->av.port->mad_agent, + cm_id_priv->msg, timeout)) + goto out; + cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; + break; + case IB_CM_REP_SENT: + if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != + CM_MSG_RESPONSE_REP || + ib_modify_mad(cm_id_priv->av.port->mad_agent, + cm_id_priv->msg, timeout)) + goto out; + cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; + break; + case IB_CM_ESTABLISHED: + if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) != + CM_MSG_RESPONSE_OTHER || + cm_id_priv->id.lap_state != IB_CM_LAP_SENT || + ib_modify_mad(cm_id_priv->av.port->mad_agent, + cm_id_priv->msg, timeout)) { + if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) + atomic_long_inc(&work->port-> + counter_group[CM_RECV_DUPLICATES]. + counter[CM_MRA_COUNTER]); + goto out; + } + cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; + break; + case IB_CM_MRA_REQ_RCVD: + case IB_CM_MRA_REP_RCVD: + atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. + counter[CM_MRA_COUNTER]); + fallthrough; + default: + trace_icm_mra_unknown_err(&cm_id_priv->id); + goto out; + } + + cm_id_priv->msg->context[1] = (void *) (unsigned long) + cm_id_priv->id.state; + cm_queue_work_unlock(cm_id_priv, work); + return 0; +out: + spin_unlock_irq(&cm_id_priv->lock); + cm_deref_id(cm_id_priv); + return -EINVAL; +} + +static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg, + struct sa_path_rec *path) +{ + u32 lid; + + if (path->rec_type != SA_PATH_REC_TYPE_OPA) { + sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID, + lap_msg)); + sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID, + lap_msg)); + } else { + lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( + CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg)); + sa_path_set_dlid(path, lid); + + lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR( + CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg)); + sa_path_set_slid(path, lid); + } +} + +static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, + struct sa_path_rec *path, + struct cm_lap_msg *lap_msg) +{ + path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg); + path->sgid = + *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg); + path->flow_label = + cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg)); + path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg); + path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg); + path->reversible = 1; + path->pkey = cm_id_priv->pkey; + path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg); + path->mtu_selector = IB_SA_EQ; + path->mtu = cm_id_priv->path_mtu; + path->rate_selector = IB_SA_EQ; + path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg); + path->packet_life_time_selector = IB_SA_EQ; + path->packet_life_time = + IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg); + path->packet_life_time -= (path->packet_life_time > 0); + cm_format_path_lid_from_lap(lap_msg, path); +} + +static int cm_lap_handler(struct cm_work *work) +{ + struct cm_id_private *cm_id_priv; + struct cm_lap_msg *lap_msg; + struct ib_cm_lap_event_param *param; + struct ib_mad_send_buf *msg = NULL; + int ret; + + /* Currently Alternate path messages are not supported for + * RoCE link layer. + */ + if (rdma_protocol_roce(work->port->cm_dev->ib_device, + work->port->port_num)) + return -EINVAL; + + /* todo: verify LAP request and send reject APR if invalid. */ + lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; + cm_id_priv = cm_acquire_id( + cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)), + cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg))); + if (!cm_id_priv) + return -EINVAL; + + param = &work->cm_event.param.lap_rcvd; + memset(&work->path[0], 0, sizeof(work->path[1])); + cm_path_set_rec_type(work->port->cm_dev->ib_device, + work->port->port_num, &work->path[0], + IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, + lap_msg)); + param->alternate_path = &work->path[0]; + cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); + work->cm_event.private_data = + IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg); + + spin_lock_irq(&cm_id_priv->lock); + if (cm_id_priv->id.state != IB_CM_ESTABLISHED) + goto unlock; + + switch (cm_id_priv->id.lap_state) { + case IB_CM_LAP_UNINIT: + case IB_CM_LAP_IDLE: + break; + case IB_CM_MRA_LAP_SENT: + atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. + counter[CM_LAP_COUNTER]); + msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); + if (IS_ERR(msg)) + goto unlock; + + cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, + CM_MSG_RESPONSE_OTHER, + cm_id_priv->service_timeout, + cm_id_priv->private_data, + cm_id_priv->private_data_len); + spin_unlock_irq(&cm_id_priv->lock); + + if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || + ib_post_send_mad(msg, NULL)) + cm_free_msg(msg); + goto deref; + case IB_CM_LAP_RCVD: + atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. + counter[CM_LAP_COUNTER]); + goto unlock; + default: + goto unlock; + } + + ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc, + work->mad_recv_wc->recv_buf.grh, + &cm_id_priv->av); + if (ret) + goto unlock; + + ret = cm_init_av_by_path(param->alternate_path, NULL, + &cm_id_priv->alt_av, cm_id_priv); + if (ret) + goto unlock; + + cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; + cm_id_priv->tid = lap_msg->hdr.tid; + cm_queue_work_unlock(cm_id_priv, work); + return 0; + +unlock: spin_unlock_irq(&cm_id_priv->lock); +deref: cm_deref_id(cm_id_priv); + return -EINVAL; +} + +static int cm_apr_handler(struct cm_work *work) +{ + struct cm_id_private *cm_id_priv; + struct cm_apr_msg *apr_msg; + + /* Currently Alternate path messages are not supported for + * RoCE link layer. + */ + if (rdma_protocol_roce(work->port->cm_dev->ib_device, + work->port->port_num)) + return -EINVAL; + + apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; + cm_id_priv = cm_acquire_id( + cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)), + cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg))); + if (!cm_id_priv) + return -EINVAL; /* Unmatched reply. */ + + work->cm_event.param.apr_rcvd.ap_status = + IBA_GET(CM_APR_AR_STATUS, apr_msg); + work->cm_event.param.apr_rcvd.apr_info = + IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg); + work->cm_event.param.apr_rcvd.info_len = + IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg); + work->cm_event.private_data = + IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg); + + spin_lock_irq(&cm_id_priv->lock); + if (cm_id_priv->id.state != IB_CM_ESTABLISHED || + (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && + cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { + spin_unlock_irq(&cm_id_priv->lock); + goto out; + } + cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; + ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); + cm_id_priv->msg = NULL; + cm_queue_work_unlock(cm_id_priv, work); + return 0; +out: + cm_deref_id(cm_id_priv); + return -EINVAL; +} + +static int cm_timewait_handler(struct cm_work *work) +{ + struct cm_timewait_info *timewait_info; + struct cm_id_private *cm_id_priv; + + timewait_info = container_of(work, struct cm_timewait_info, work); + spin_lock_irq(&cm.lock); + list_del(&timewait_info->list); + spin_unlock_irq(&cm.lock); + + cm_id_priv = cm_acquire_id(timewait_info->work.local_id, + timewait_info->work.remote_id); + if (!cm_id_priv) + return -EINVAL; + + spin_lock_irq(&cm_id_priv->lock); + if (cm_id_priv->id.state != IB_CM_TIMEWAIT || + cm_id_priv->remote_qpn != timewait_info->remote_qpn) { + spin_unlock_irq(&cm_id_priv->lock); + goto out; + } + cm_id_priv->id.state = IB_CM_IDLE; + cm_queue_work_unlock(cm_id_priv, work); + return 0; +out: + cm_deref_id(cm_id_priv); + return -EINVAL; +} + +static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, + struct cm_id_private *cm_id_priv, + struct ib_cm_sidr_req_param *param) +{ + cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, + cm_form_tid(cm_id_priv)); + IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg, + be32_to_cpu(cm_id_priv->id.local_id)); + IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg, + be16_to_cpu(param->path->pkey)); + IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg, + be64_to_cpu(param->service_id)); + + if (param->private_data && param->private_data_len) + IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg, + param->private_data, param->private_data_len); +} + +int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, + struct ib_cm_sidr_req_param *param) +{ + struct cm_id_private *cm_id_priv; + struct ib_mad_send_buf *msg; + unsigned long flags; + int ret; + + if (!param->path || (param->private_data && + param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) + return -EINVAL; + + cm_id_priv = container_of(cm_id, struct cm_id_private, id); + ret = cm_init_av_by_path(param->path, param->sgid_attr, + &cm_id_priv->av, + cm_id_priv); + if (ret) + goto out; + + cm_id->service_id = param->service_id; + cm_id->service_mask = ~cpu_to_be64(0); + cm_id_priv->timeout_ms = param->timeout_ms; + cm_id_priv->max_cm_retries = param->max_cm_retries; + ret = cm_alloc_msg(cm_id_priv, &msg); + if (ret) + goto out; + + cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, + param); + msg->timeout_ms = cm_id_priv->timeout_ms; + msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; + + spin_lock_irqsave(&cm_id_priv->lock, flags); + if (cm_id->state == IB_CM_IDLE) { + trace_icm_send_sidr_req(&cm_id_priv->id); + ret = ib_post_send_mad(msg, NULL); + } else { + ret = -EINVAL; + } + + if (ret) { + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + cm_free_msg(msg); + goto out; + } + cm_id->state = IB_CM_SIDR_REQ_SENT; + cm_id_priv->msg = msg; + spin_unlock_irqrestore(&cm_id_priv->lock, flags); +out: + return ret; +} +EXPORT_SYMBOL(ib_send_cm_sidr_req); + +static void cm_format_sidr_req_event(struct cm_work *work, + const struct cm_id_private *rx_cm_id, + struct ib_cm_id *listen_id) +{ + struct cm_sidr_req_msg *sidr_req_msg; + struct ib_cm_sidr_req_event_param *param; + + sidr_req_msg = (struct cm_sidr_req_msg *) + work->mad_recv_wc->recv_buf.mad; + param = &work->cm_event.param.sidr_req_rcvd; + param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg); + param->listen_id = listen_id; + param->service_id = + cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); + param->bth_pkey = cm_get_bth_pkey(work); + param->port = work->port->port_num; + param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr; + work->cm_event.private_data = + IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg); +} + +static int cm_sidr_req_handler(struct cm_work *work) +{ + struct cm_id_private *cm_id_priv, *listen_cm_id_priv; + struct cm_sidr_req_msg *sidr_req_msg; + struct ib_wc *wc; + int ret; + + cm_id_priv = + cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL); + if (IS_ERR(cm_id_priv)) + return PTR_ERR(cm_id_priv); + + /* Record SGID/SLID and request ID for lookup. */ + sidr_req_msg = (struct cm_sidr_req_msg *) + work->mad_recv_wc->recv_buf.mad; + + cm_id_priv->id.remote_id = + cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg)); + cm_id_priv->id.service_id = + cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg)); + cm_id_priv->id.service_mask = ~cpu_to_be64(0); + cm_id_priv->tid = sidr_req_msg->hdr.tid; + + wc = work->mad_recv_wc->wc; + cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); + cm_id_priv->av.dgid.global.interface_id = 0; + ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, + work->mad_recv_wc->recv_buf.grh, + &cm_id_priv->av); + if (ret) + goto out; + + spin_lock_irq(&cm.lock); + listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); + if (listen_cm_id_priv) { + spin_unlock_irq(&cm.lock); + atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. + counter[CM_SIDR_REQ_COUNTER]); + goto out; /* Duplicate message. */ + } + cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; + listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, + cm_id_priv->id.service_id); + if (!listen_cm_id_priv) { + spin_unlock_irq(&cm.lock); + ib_send_cm_sidr_rep(&cm_id_priv->id, + &(struct ib_cm_sidr_rep_param){ + .status = IB_SIDR_UNSUPPORTED }); + goto out; /* No match. */ + } + spin_unlock_irq(&cm.lock); + + cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; + cm_id_priv->id.context = listen_cm_id_priv->id.context; + + /* + * A SIDR ID does not need to be in the xarray since it does not receive + * mads, is not placed in the remote_id or remote_qpn rbtree, and does + * not enter timewait. + */ + + cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id); + ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); + cm_free_work(work); + /* + * A pointer to the listen_cm_id is held in the event, so this deref + * must be after the event is delivered above. + */ + cm_deref_id(listen_cm_id_priv); + if (ret) + cm_destroy_id(&cm_id_priv->id, ret); + return 0; +out: + ib_destroy_cm_id(&cm_id_priv->id); + return -EINVAL; +} + +static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, + struct cm_id_private *cm_id_priv, + struct ib_cm_sidr_rep_param *param) +{ + cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, + cm_id_priv->tid, param->ece.attr_mod); + IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg, + be32_to_cpu(cm_id_priv->id.remote_id)); + IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status); + IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num); + IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg, + be64_to_cpu(cm_id_priv->id.service_id)); + IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey); + IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg, + param->ece.vendor_id & 0xFF); + IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg, + (param->ece.vendor_id >> 8) & 0xFF); + + if (param->info && param->info_length) + IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg, + param->info, param->info_length); + + if (param->private_data && param->private_data_len) + IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg, + param->private_data, param->private_data_len); +} + +static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv, + struct ib_cm_sidr_rep_param *param) +{ + struct ib_mad_send_buf *msg; + unsigned long flags; + int ret; + + lockdep_assert_held(&cm_id_priv->lock); + + if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || + (param->private_data && + param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) + return -EINVAL; + + if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD) + return -EINVAL; + + ret = cm_alloc_msg(cm_id_priv, &msg); + if (ret) + return ret; + + cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, + param); + trace_icm_send_sidr_rep(&cm_id_priv->id); + ret = ib_post_send_mad(msg, NULL); + if (ret) { + cm_free_msg(msg); + return ret; + } + cm_id_priv->id.state = IB_CM_IDLE; + spin_lock_irqsave(&cm.lock, flags); + if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { + rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); + RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); + } + spin_unlock_irqrestore(&cm.lock, flags); + return 0; +} + +int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, + struct ib_cm_sidr_rep_param *param) +{ + struct cm_id_private *cm_id_priv = + container_of(cm_id, struct cm_id_private, id); + unsigned long flags; + int ret; + + spin_lock_irqsave(&cm_id_priv->lock, flags); + ret = cm_send_sidr_rep_locked(cm_id_priv, param); + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + return ret; +} +EXPORT_SYMBOL(ib_send_cm_sidr_rep); + +static void cm_format_sidr_rep_event(struct cm_work *work, + const struct cm_id_private *cm_id_priv) +{ + struct cm_sidr_rep_msg *sidr_rep_msg; + struct ib_cm_sidr_rep_event_param *param; + + sidr_rep_msg = (struct cm_sidr_rep_msg *) + work->mad_recv_wc->recv_buf.mad; + param = &work->cm_event.param.sidr_rep_rcvd; + param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg); + param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg); + param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg); + param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION, + sidr_rep_msg); + param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH, + sidr_rep_msg); + param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr; + work->cm_event.private_data = + IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg); +} + +static int cm_sidr_rep_handler(struct cm_work *work) +{ + struct cm_sidr_rep_msg *sidr_rep_msg; + struct cm_id_private *cm_id_priv; + + sidr_rep_msg = (struct cm_sidr_rep_msg *) + work->mad_recv_wc->recv_buf.mad; + cm_id_priv = cm_acquire_id( + cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0); + if (!cm_id_priv) + return -EINVAL; /* Unmatched reply. */ + + spin_lock_irq(&cm_id_priv->lock); + if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { + spin_unlock_irq(&cm_id_priv->lock); + goto out; + } + cm_id_priv->id.state = IB_CM_IDLE; + ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); + spin_unlock_irq(&cm_id_priv->lock); + + cm_format_sidr_rep_event(work, cm_id_priv); + cm_process_work(cm_id_priv, work); + return 0; +out: + cm_deref_id(cm_id_priv); + return -EINVAL; +} + +static void cm_process_send_error(struct ib_mad_send_buf *msg, + enum ib_wc_status wc_status) +{ + struct cm_id_private *cm_id_priv; + struct ib_cm_event cm_event; + enum ib_cm_state state; + int ret; + + memset(&cm_event, 0, sizeof cm_event); + cm_id_priv = msg->context[0]; + + /* Discard old sends or ones without a response. */ + spin_lock_irq(&cm_id_priv->lock); + state = (enum ib_cm_state) (unsigned long) msg->context[1]; + if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) + goto discard; + + trace_icm_mad_send_err(state, wc_status); + switch (state) { + case IB_CM_REQ_SENT: + case IB_CM_MRA_REQ_RCVD: + cm_reset_to_idle(cm_id_priv); + cm_event.event = IB_CM_REQ_ERROR; + break; + case IB_CM_REP_SENT: + case IB_CM_MRA_REP_RCVD: + cm_reset_to_idle(cm_id_priv); + cm_event.event = IB_CM_REP_ERROR; + break; + case IB_CM_DREQ_SENT: + cm_enter_timewait(cm_id_priv); + cm_event.event = IB_CM_DREQ_ERROR; + break; + case IB_CM_SIDR_REQ_SENT: + cm_id_priv->id.state = IB_CM_IDLE; + cm_event.event = IB_CM_SIDR_REQ_ERROR; + break; + default: + goto discard; + } + spin_unlock_irq(&cm_id_priv->lock); + cm_event.param.send_status = wc_status; + + /* No other events can occur on the cm_id at this point. */ + ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); + cm_free_msg(msg); + if (ret) + ib_destroy_cm_id(&cm_id_priv->id); + return; +discard: + spin_unlock_irq(&cm_id_priv->lock); + cm_free_msg(msg); +} + +static void cm_send_handler(struct ib_mad_agent *mad_agent, + struct ib_mad_send_wc *mad_send_wc) +{ + struct ib_mad_send_buf *msg = mad_send_wc->send_buf; + struct cm_port *port; + u16 attr_index; + + port = mad_agent->context; + attr_index = be16_to_cpu(((struct ib_mad_hdr *) + msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; + + /* + * If the send was in response to a received message (context[0] is not + * set to a cm_id), and is not a REJ, then it is a send that was + * manually retried. + */ + if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) + msg->retries = 1; + + atomic_long_add(1 + msg->retries, + &port->counter_group[CM_XMIT].counter[attr_index]); + if (msg->retries) + atomic_long_add(msg->retries, + &port->counter_group[CM_XMIT_RETRIES]. + counter[attr_index]); + + switch (mad_send_wc->status) { + case IB_WC_SUCCESS: + case IB_WC_WR_FLUSH_ERR: + cm_free_msg(msg); + break; + default: + if (msg->context[0] && msg->context[1]) + cm_process_send_error(msg, mad_send_wc->status); + else + cm_free_msg(msg); + break; + } +} + +static void cm_work_handler(struct work_struct *_work) +{ + struct cm_work *work = container_of(_work, struct cm_work, work.work); + int ret; + + switch (work->cm_event.event) { + case IB_CM_REQ_RECEIVED: + ret = cm_req_handler(work); + break; + case IB_CM_MRA_RECEIVED: + ret = cm_mra_handler(work); + break; + case IB_CM_REJ_RECEIVED: + ret = cm_rej_handler(work); + break; + case IB_CM_REP_RECEIVED: + ret = cm_rep_handler(work); + break; + case IB_CM_RTU_RECEIVED: + ret = cm_rtu_handler(work); + break; + case IB_CM_USER_ESTABLISHED: + ret = cm_establish_handler(work); + break; + case IB_CM_DREQ_RECEIVED: + ret = cm_dreq_handler(work); + break; + case IB_CM_DREP_RECEIVED: + ret = cm_drep_handler(work); + break; + case IB_CM_SIDR_REQ_RECEIVED: + ret = cm_sidr_req_handler(work); + break; + case IB_CM_SIDR_REP_RECEIVED: + ret = cm_sidr_rep_handler(work); + break; + case IB_CM_LAP_RECEIVED: + ret = cm_lap_handler(work); + break; + case IB_CM_APR_RECEIVED: + ret = cm_apr_handler(work); + break; + case IB_CM_TIMEWAIT_EXIT: + ret = cm_timewait_handler(work); + break; + default: + trace_icm_handler_err(work->cm_event.event); + ret = -EINVAL; + break; + } + if (ret) + cm_free_work(work); +} + +static int cm_establish(struct ib_cm_id *cm_id) +{ + struct cm_id_private *cm_id_priv; + struct cm_work *work; + unsigned long flags; + int ret = 0; + struct cm_device *cm_dev; + + cm_dev = ib_get_client_data(cm_id->device, &cm_client); + if (!cm_dev) + return -ENODEV; + + work = kmalloc(sizeof *work, GFP_ATOMIC); + if (!work) + return -ENOMEM; + + cm_id_priv = container_of(cm_id, struct cm_id_private, id); + spin_lock_irqsave(&cm_id_priv->lock, flags); + switch (cm_id->state) + { + case IB_CM_REP_SENT: + case IB_CM_MRA_REP_RCVD: + cm_id->state = IB_CM_ESTABLISHED; + break; + case IB_CM_ESTABLISHED: + ret = -EISCONN; + break; + default: + trace_icm_establish_err(cm_id); + ret = -EINVAL; + break; + } + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + + if (ret) { + kfree(work); + goto out; + } + + /* + * The CM worker thread may try to destroy the cm_id before it + * can execute this work item. To prevent potential deadlock, + * we need to find the cm_id once we're in the context of the + * worker thread, rather than holding a reference on it. + */ + INIT_DELAYED_WORK(&work->work, cm_work_handler); + work->local_id = cm_id->local_id; + work->remote_id = cm_id->remote_id; + work->mad_recv_wc = NULL; + work->cm_event.event = IB_CM_USER_ESTABLISHED; + + /* Check if the device started its remove_one */ + spin_lock_irqsave(&cm.lock, flags); + if (!cm_dev->going_down) { + queue_delayed_work(cm.wq, &work->work, 0); + } else { + kfree(work); + ret = -ENODEV; + } + spin_unlock_irqrestore(&cm.lock, flags); + +out: + return ret; +} + +static int cm_migrate(struct ib_cm_id *cm_id) +{ + struct cm_id_private *cm_id_priv; + struct cm_av tmp_av; + unsigned long flags; + int tmp_send_port_not_ready; + int ret = 0; + + cm_id_priv = container_of(cm_id, struct cm_id_private, id); + spin_lock_irqsave(&cm_id_priv->lock, flags); + if (cm_id->state == IB_CM_ESTABLISHED && + (cm_id->lap_state == IB_CM_LAP_UNINIT || + cm_id->lap_state == IB_CM_LAP_IDLE)) { + cm_id->lap_state = IB_CM_LAP_IDLE; + /* Swap address vector */ + tmp_av = cm_id_priv->av; + cm_id_priv->av = cm_id_priv->alt_av; + cm_id_priv->alt_av = tmp_av; + /* Swap port send ready state */ + tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready; + cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready; + cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready; + } else + ret = -EINVAL; + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + + return ret; +} + +int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) +{ + int ret; + + switch (event) { + case IB_EVENT_COMM_EST: + ret = cm_establish(cm_id); + break; + case IB_EVENT_PATH_MIG: + ret = cm_migrate(cm_id); + break; + default: + ret = -EINVAL; + } + return ret; +} +EXPORT_SYMBOL(ib_cm_notify); + +static void cm_recv_handler(struct ib_mad_agent *mad_agent, + struct ib_mad_send_buf *send_buf, + struct ib_mad_recv_wc *mad_recv_wc) +{ + struct cm_port *port = mad_agent->context; + struct cm_work *work; + enum ib_cm_event_type event; + bool alt_path = false; + u16 attr_id; + int paths = 0; + int going_down = 0; + + switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { + case CM_REQ_ATTR_ID: + alt_path = cm_req_has_alt_path((struct cm_req_msg *) + mad_recv_wc->recv_buf.mad); + paths = 1 + (alt_path != 0); + event = IB_CM_REQ_RECEIVED; + break; + case CM_MRA_ATTR_ID: + event = IB_CM_MRA_RECEIVED; + break; + case CM_REJ_ATTR_ID: + event = IB_CM_REJ_RECEIVED; + break; + case CM_REP_ATTR_ID: + event = IB_CM_REP_RECEIVED; + break; + case CM_RTU_ATTR_ID: + event = IB_CM_RTU_RECEIVED; + break; + case CM_DREQ_ATTR_ID: + event = IB_CM_DREQ_RECEIVED; + break; + case CM_DREP_ATTR_ID: + event = IB_CM_DREP_RECEIVED; + break; + case CM_SIDR_REQ_ATTR_ID: + event = IB_CM_SIDR_REQ_RECEIVED; + break; + case CM_SIDR_REP_ATTR_ID: + event = IB_CM_SIDR_REP_RECEIVED; + break; + case CM_LAP_ATTR_ID: + paths = 1; + event = IB_CM_LAP_RECEIVED; + break; + case CM_APR_ATTR_ID: + event = IB_CM_APR_RECEIVED; + break; + default: + ib_free_recv_mad(mad_recv_wc); + return; + } + + attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); + atomic_long_inc(&port->counter_group[CM_RECV]. + counter[attr_id - CM_ATTR_ID_OFFSET]); + + work = kmalloc(struct_size(work, path, paths), GFP_KERNEL); + if (!work) { + ib_free_recv_mad(mad_recv_wc); + return; + } + + INIT_DELAYED_WORK(&work->work, cm_work_handler); + work->cm_event.event = event; + work->mad_recv_wc = mad_recv_wc; + work->port = port; + + /* Check if the device started its remove_one */ + spin_lock_irq(&cm.lock); + if (!port->cm_dev->going_down) + queue_delayed_work(cm.wq, &work->work, 0); + else + going_down = 1; + spin_unlock_irq(&cm.lock); + + if (going_down) { + kfree(work); + ib_free_recv_mad(mad_recv_wc); + } +} + +static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, + struct ib_qp_attr *qp_attr, + int *qp_attr_mask) +{ + unsigned long flags; + int ret; + + spin_lock_irqsave(&cm_id_priv->lock, flags); + switch (cm_id_priv->id.state) { + case IB_CM_REQ_SENT: + case IB_CM_MRA_REQ_RCVD: + case IB_CM_REQ_RCVD: + case IB_CM_MRA_REQ_SENT: + case IB_CM_REP_RCVD: + case IB_CM_MRA_REP_SENT: + case IB_CM_REP_SENT: + case IB_CM_MRA_REP_RCVD: + case IB_CM_ESTABLISHED: + *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | + IB_QP_PKEY_INDEX | IB_QP_PORT; + qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; + if (cm_id_priv->responder_resources) + qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | + IB_ACCESS_REMOTE_ATOMIC; + qp_attr->pkey_index = cm_id_priv->av.pkey_index; + qp_attr->port_num = cm_id_priv->av.port->port_num; + ret = 0; + break; + default: + trace_icm_qp_init_err(&cm_id_priv->id); + ret = -EINVAL; + break; + } + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + return ret; +} + +static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, + struct ib_qp_attr *qp_attr, + int *qp_attr_mask) +{ + unsigned long flags; + int ret; + + spin_lock_irqsave(&cm_id_priv->lock, flags); + switch (cm_id_priv->id.state) { + case IB_CM_REQ_RCVD: + case IB_CM_MRA_REQ_SENT: + case IB_CM_REP_RCVD: + case IB_CM_MRA_REP_SENT: + case IB_CM_REP_SENT: + case IB_CM_MRA_REP_RCVD: + case IB_CM_ESTABLISHED: + *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | + IB_QP_DEST_QPN | IB_QP_RQ_PSN; + qp_attr->ah_attr = cm_id_priv->av.ah_attr; + qp_attr->path_mtu = cm_id_priv->path_mtu; + qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); + qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); + if (cm_id_priv->qp_type == IB_QPT_RC || + cm_id_priv->qp_type == IB_QPT_XRC_TGT) { + *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | + IB_QP_MIN_RNR_TIMER; + qp_attr->max_dest_rd_atomic = + cm_id_priv->responder_resources; + qp_attr->min_rnr_timer = 0; + } + if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { + *qp_attr_mask |= IB_QP_ALT_PATH; + qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; + qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; + qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; + qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; + } + ret = 0; + break; + default: + trace_icm_qp_rtr_err(&cm_id_priv->id); + ret = -EINVAL; + break; + } + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + return ret; +} + +static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, + struct ib_qp_attr *qp_attr, + int *qp_attr_mask) +{ + unsigned long flags; + int ret; + + spin_lock_irqsave(&cm_id_priv->lock, flags); + switch (cm_id_priv->id.state) { + /* Allow transition to RTS before sending REP */ + case IB_CM_REQ_RCVD: + case IB_CM_MRA_REQ_SENT: + + case IB_CM_REP_RCVD: + case IB_CM_MRA_REP_SENT: + case IB_CM_REP_SENT: + case IB_CM_MRA_REP_RCVD: + case IB_CM_ESTABLISHED: + if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { + *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; + qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); + switch (cm_id_priv->qp_type) { + case IB_QPT_RC: + case IB_QPT_XRC_INI: + *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | + IB_QP_MAX_QP_RD_ATOMIC; + qp_attr->retry_cnt = cm_id_priv->retry_count; + qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; + qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; + fallthrough; + case IB_QPT_XRC_TGT: + *qp_attr_mask |= IB_QP_TIMEOUT; + qp_attr->timeout = cm_id_priv->av.timeout; + break; + default: + break; + } + if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) { + *qp_attr_mask |= IB_QP_PATH_MIG_STATE; + qp_attr->path_mig_state = IB_MIG_REARM; + } + } else { + *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; + qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; + qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; + qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; + qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; + qp_attr->path_mig_state = IB_MIG_REARM; + } + ret = 0; + break; + default: + trace_icm_qp_rts_err(&cm_id_priv->id); + ret = -EINVAL; + break; + } + spin_unlock_irqrestore(&cm_id_priv->lock, flags); + return ret; +} + +int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, + struct ib_qp_attr *qp_attr, + int *qp_attr_mask) +{ + struct cm_id_private *cm_id_priv; + int ret; + + cm_id_priv = container_of(cm_id, struct cm_id_private, id); + switch (qp_attr->qp_state) { + case IB_QPS_INIT: + ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); + break; + case IB_QPS_RTR: + ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); + break; + case IB_QPS_RTS: + ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); + break; + default: + ret = -EINVAL; + break; + } + return ret; +} +EXPORT_SYMBOL(ib_cm_init_qp_attr); + +static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, + char *buf) +{ + struct cm_counter_group *group; + struct cm_counter_attribute *cm_attr; + + group = container_of(obj, struct cm_counter_group, obj); + cm_attr = container_of(attr, struct cm_counter_attribute, attr); + + return sprintf(buf, "%ld\n", + atomic_long_read(&group->counter[cm_attr->index])); +} + +static const struct sysfs_ops cm_counter_ops = { + .show = cm_show_counter +}; + +static struct kobj_type cm_counter_obj_type = { + .sysfs_ops = &cm_counter_ops, + .default_attrs = cm_counter_default_attrs +}; + +static int cm_create_port_fs(struct cm_port *port) +{ + int i, ret; + + for (i = 0; i < CM_COUNTER_GROUPS; i++) { + ret = ib_port_register_module_stat(port->cm_dev->ib_device, + port->port_num, + &port->counter_group[i].obj, + &cm_counter_obj_type, + counter_group_names[i]); + if (ret) + goto error; + } + + return 0; + +error: + while (i--) + ib_port_unregister_module_stat(&port->counter_group[i].obj); + return ret; + +} + +static void cm_remove_port_fs(struct cm_port *port) +{ + int i; + + for (i = 0; i < CM_COUNTER_GROUPS; i++) + ib_port_unregister_module_stat(&port->counter_group[i].obj); + +} + +static int cm_add_one(struct ib_device *ib_device) +{ + struct cm_device *cm_dev; + struct cm_port *port; + struct ib_mad_reg_req reg_req = { + .mgmt_class = IB_MGMT_CLASS_CM, + .mgmt_class_version = IB_CM_CLASS_VERSION, + }; + struct ib_port_modify port_modify = { + .set_port_cap_mask = IB_PORT_CM_SUP + }; + unsigned long flags; + int ret; + int count = 0; + unsigned int i; + + cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt), + GFP_KERNEL); + if (!cm_dev) + return -ENOMEM; + + cm_dev->ib_device = ib_device; + cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; + cm_dev->going_down = 0; + + set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); + rdma_for_each_port (ib_device, i) { + if (!rdma_cap_ib_cm(ib_device, i)) + continue; + + port = kzalloc(sizeof *port, GFP_KERNEL); + if (!port) { + ret = -ENOMEM; + goto error1; + } + + cm_dev->port[i-1] = port; + port->cm_dev = cm_dev; + port->port_num = i; + + INIT_LIST_HEAD(&port->cm_priv_prim_list); + INIT_LIST_HEAD(&port->cm_priv_altr_list); + + ret = cm_create_port_fs(port); + if (ret) + goto error1; + + port->mad_agent = ib_register_mad_agent(ib_device, i, + IB_QPT_GSI, + ®_req, + 0, + cm_send_handler, + cm_recv_handler, + port, + 0); + if (IS_ERR(port->mad_agent)) { + ret = PTR_ERR(port->mad_agent); + goto error2; + } + + ret = ib_modify_port(ib_device, i, 0, &port_modify); + if (ret) + goto error3; + + count++; + } + + if (!count) { + ret = -EOPNOTSUPP; + goto free; + } + + ib_set_client_data(ib_device, &cm_client, cm_dev); + + write_lock_irqsave(&cm.device_lock, flags); + list_add_tail(&cm_dev->list, &cm.device_list); + write_unlock_irqrestore(&cm.device_lock, flags); + return 0; + +error3: + ib_unregister_mad_agent(port->mad_agent); +error2: + cm_remove_port_fs(port); +error1: + port_modify.set_port_cap_mask = 0; + port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; + kfree(port); + while (--i) { + if (!rdma_cap_ib_cm(ib_device, i)) + continue; + + port = cm_dev->port[i-1]; + ib_modify_port(ib_device, port->port_num, 0, &port_modify); + ib_unregister_mad_agent(port->mad_agent); + cm_remove_port_fs(port); + kfree(port); + } +free: + kfree(cm_dev); + return ret; +} + +static void cm_remove_one(struct ib_device *ib_device, void *client_data) +{ + struct cm_device *cm_dev = client_data; + struct cm_port *port; + struct cm_id_private *cm_id_priv; + struct ib_mad_agent *cur_mad_agent; + struct ib_port_modify port_modify = { + .clr_port_cap_mask = IB_PORT_CM_SUP + }; + unsigned long flags; + unsigned int i; + + write_lock_irqsave(&cm.device_lock, flags); + list_del(&cm_dev->list); + write_unlock_irqrestore(&cm.device_lock, flags); + + spin_lock_irq(&cm.lock); + cm_dev->going_down = 1; + spin_unlock_irq(&cm.lock); + + rdma_for_each_port (ib_device, i) { + if (!rdma_cap_ib_cm(ib_device, i)) + continue; + + port = cm_dev->port[i-1]; + ib_modify_port(ib_device, port->port_num, 0, &port_modify); + /* Mark all the cm_id's as not valid */ + spin_lock_irq(&cm.lock); + list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list) + cm_id_priv->altr_send_port_not_ready = 1; + list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list) + cm_id_priv->prim_send_port_not_ready = 1; + spin_unlock_irq(&cm.lock); + /* + * We flush the queue here after the going_down set, this + * verify that no new works will be queued in the recv handler, + * after that we can call the unregister_mad_agent + */ + flush_workqueue(cm.wq); + spin_lock_irq(&cm.state_lock); + cur_mad_agent = port->mad_agent; + port->mad_agent = NULL; + spin_unlock_irq(&cm.state_lock); + ib_unregister_mad_agent(cur_mad_agent); + cm_remove_port_fs(port); + kfree(port); + } + + kfree(cm_dev); +} + +static int __init ib_cm_init(void) +{ + int ret; + + INIT_LIST_HEAD(&cm.device_list); + rwlock_init(&cm.device_lock); + spin_lock_init(&cm.lock); + spin_lock_init(&cm.state_lock); + cm.listen_service_table = RB_ROOT; + cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); + cm.remote_id_table = RB_ROOT; + cm.remote_qp_table = RB_ROOT; + cm.remote_sidr_table = RB_ROOT; + xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC); + get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); + INIT_LIST_HEAD(&cm.timewait_list); + + cm.wq = alloc_workqueue("ib_cm", 0, 1); + if (!cm.wq) { + ret = -ENOMEM; + goto error2; + } + + ret = ib_register_client(&cm_client); + if (ret) + goto error3; + + return 0; +error3: + destroy_workqueue(cm.wq); +error2: + return ret; +} + +static void __exit ib_cm_cleanup(void) +{ + struct cm_timewait_info *timewait_info, *tmp; + + spin_lock_irq(&cm.lock); + list_for_each_entry(timewait_info, &cm.timewait_list, list) + cancel_delayed_work(&timewait_info->work.work); + spin_unlock_irq(&cm.lock); + + ib_unregister_client(&cm_client); + destroy_workqueue(cm.wq); + + list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { + list_del(&timewait_info->list); + kfree(timewait_info); + } + + WARN_ON(!xa_empty(&cm.local_id_table)); +} + +module_init(ib_cm_init); +module_exit(ib_cm_cleanup); |