diff options
Diffstat (limited to 'net/rds/ib.c')
| -rw-r--r-- | net/rds/ib.c | 586 |
1 files changed, 586 insertions, 0 deletions
diff --git a/net/rds/ib.c b/net/rds/ib.c new file mode 100644 index 000000000..ba3379085 --- /dev/null +++ b/net/rds/ib.c @@ -0,0 +1,586 @@ +/* + * Copyright (c) 2006, 2018 Oracle and/or its affiliates. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + */ +#include <linux/kernel.h> +#include <linux/in.h> +#include <linux/if.h> +#include <linux/netdevice.h> +#include <linux/inetdevice.h> +#include <linux/if_arp.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <net/addrconf.h> + +#include "rds_single_path.h" +#include "rds.h" +#include "ib.h" +#include "ib_mr.h" + +static unsigned int rds_ib_mr_1m_pool_size = RDS_MR_1M_POOL_SIZE; +static unsigned int rds_ib_mr_8k_pool_size = RDS_MR_8K_POOL_SIZE; +unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT; +static atomic_t rds_ib_unloading; + +module_param(rds_ib_mr_1m_pool_size, int, 0444); +MODULE_PARM_DESC(rds_ib_mr_1m_pool_size, " Max number of 1M mr per HCA"); +module_param(rds_ib_mr_8k_pool_size, int, 0444); +MODULE_PARM_DESC(rds_ib_mr_8k_pool_size, " Max number of 8K mr per HCA"); +module_param(rds_ib_retry_count, int, 0444); +MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error"); + +/* + * we have a clumsy combination of RCU and a rwsem protecting this list + * because it is used both in the get_mr fast path and while blocking in + * the FMR flushing path. + */ +DECLARE_RWSEM(rds_ib_devices_lock); +struct list_head rds_ib_devices; + +/* NOTE: if also grabbing ibdev lock, grab this first */ +DEFINE_SPINLOCK(ib_nodev_conns_lock); +LIST_HEAD(ib_nodev_conns); + +static void rds_ib_nodev_connect(void) +{ + struct rds_ib_connection *ic; + + spin_lock(&ib_nodev_conns_lock); + list_for_each_entry(ic, &ib_nodev_conns, ib_node) + rds_conn_connect_if_down(ic->conn); + spin_unlock(&ib_nodev_conns_lock); +} + +static void rds_ib_dev_shutdown(struct rds_ib_device *rds_ibdev) +{ + struct rds_ib_connection *ic; + unsigned long flags; + + spin_lock_irqsave(&rds_ibdev->spinlock, flags); + list_for_each_entry(ic, &rds_ibdev->conn_list, ib_node) + rds_conn_drop(ic->conn); + spin_unlock_irqrestore(&rds_ibdev->spinlock, flags); +} + +/* + * rds_ib_destroy_mr_pool() blocks on a few things and mrs drop references + * from interrupt context so we push freing off into a work struct in krdsd. + */ +static void rds_ib_dev_free(struct work_struct *work) +{ + struct rds_ib_ipaddr *i_ipaddr, *i_next; + struct rds_ib_device *rds_ibdev = container_of(work, + struct rds_ib_device, free_work); + + if (rds_ibdev->mr_8k_pool) + rds_ib_destroy_mr_pool(rds_ibdev->mr_8k_pool); + if (rds_ibdev->mr_1m_pool) + rds_ib_destroy_mr_pool(rds_ibdev->mr_1m_pool); + if (rds_ibdev->pd) + ib_dealloc_pd(rds_ibdev->pd); + + list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) { + list_del(&i_ipaddr->list); + kfree(i_ipaddr); + } + + kfree(rds_ibdev->vector_load); + + kfree(rds_ibdev); +} + +void rds_ib_dev_put(struct rds_ib_device *rds_ibdev) +{ + BUG_ON(refcount_read(&rds_ibdev->refcount) == 0); + if (refcount_dec_and_test(&rds_ibdev->refcount)) + queue_work(rds_wq, &rds_ibdev->free_work); +} + +static void rds_ib_add_one(struct ib_device *device) +{ + struct rds_ib_device *rds_ibdev; + bool has_fr, has_fmr; + + /* Only handle IB (no iWARP) devices */ + if (device->node_type != RDMA_NODE_IB_CA) + return; + + rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL, + ibdev_to_node(device)); + if (!rds_ibdev) + return; + + spin_lock_init(&rds_ibdev->spinlock); + refcount_set(&rds_ibdev->refcount, 1); + INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free); + + INIT_LIST_HEAD(&rds_ibdev->ipaddr_list); + INIT_LIST_HEAD(&rds_ibdev->conn_list); + + rds_ibdev->max_wrs = device->attrs.max_qp_wr; + rds_ibdev->max_sge = min(device->attrs.max_send_sge, RDS_IB_MAX_SGE); + + has_fr = (device->attrs.device_cap_flags & + IB_DEVICE_MEM_MGT_EXTENSIONS); + has_fmr = (device->alloc_fmr && device->dealloc_fmr && + device->map_phys_fmr && device->unmap_fmr); + rds_ibdev->use_fastreg = (has_fr && !has_fmr); + + rds_ibdev->fmr_max_remaps = device->attrs.max_map_per_fmr?: 32; + rds_ibdev->max_1m_mrs = device->attrs.max_mr ? + min_t(unsigned int, (device->attrs.max_mr / 2), + rds_ib_mr_1m_pool_size) : rds_ib_mr_1m_pool_size; + + rds_ibdev->max_8k_mrs = device->attrs.max_mr ? + min_t(unsigned int, ((device->attrs.max_mr / 2) * RDS_MR_8K_SCALE), + rds_ib_mr_8k_pool_size) : rds_ib_mr_8k_pool_size; + + rds_ibdev->max_initiator_depth = device->attrs.max_qp_init_rd_atom; + rds_ibdev->max_responder_resources = device->attrs.max_qp_rd_atom; + + rds_ibdev->vector_load = kcalloc(device->num_comp_vectors, + sizeof(int), + GFP_KERNEL); + if (!rds_ibdev->vector_load) { + pr_err("RDS/IB: %s failed to allocate vector memory\n", + __func__); + goto put_dev; + } + + rds_ibdev->dev = device; + rds_ibdev->pd = ib_alloc_pd(device, 0); + if (IS_ERR(rds_ibdev->pd)) { + rds_ibdev->pd = NULL; + goto put_dev; + } + + rds_ibdev->mr_1m_pool = + rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_1M_POOL); + if (IS_ERR(rds_ibdev->mr_1m_pool)) { + rds_ibdev->mr_1m_pool = NULL; + goto put_dev; + } + + rds_ibdev->mr_8k_pool = + rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_8K_POOL); + if (IS_ERR(rds_ibdev->mr_8k_pool)) { + rds_ibdev->mr_8k_pool = NULL; + goto put_dev; + } + + rdsdebug("RDS/IB: max_mr = %d, max_wrs = %d, max_sge = %d, fmr_max_remaps = %d, max_1m_mrs = %d, max_8k_mrs = %d\n", + device->attrs.max_fmr, rds_ibdev->max_wrs, rds_ibdev->max_sge, + rds_ibdev->fmr_max_remaps, rds_ibdev->max_1m_mrs, + rds_ibdev->max_8k_mrs); + + pr_info("RDS/IB: %s: %s supported and preferred\n", + device->name, + rds_ibdev->use_fastreg ? "FRMR" : "FMR"); + + down_write(&rds_ib_devices_lock); + list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices); + up_write(&rds_ib_devices_lock); + refcount_inc(&rds_ibdev->refcount); + + ib_set_client_data(device, &rds_ib_client, rds_ibdev); + refcount_inc(&rds_ibdev->refcount); + + rds_ib_nodev_connect(); + +put_dev: + rds_ib_dev_put(rds_ibdev); +} + +/* + * New connections use this to find the device to associate with the + * connection. It's not in the fast path so we're not concerned about the + * performance of the IB call. (As of this writing, it uses an interrupt + * blocking spinlock to serialize walking a per-device list of all registered + * clients.) + * + * RCU is used to handle incoming connections racing with device teardown. + * Rather than use a lock to serialize removal from the client_data and + * getting a new reference, we use an RCU grace period. The destruction + * path removes the device from client_data and then waits for all RCU + * readers to finish. + * + * A new connection can get NULL from this if its arriving on a + * device that is in the process of being removed. + */ +struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device) +{ + struct rds_ib_device *rds_ibdev; + + rcu_read_lock(); + rds_ibdev = ib_get_client_data(device, &rds_ib_client); + if (rds_ibdev) + refcount_inc(&rds_ibdev->refcount); + rcu_read_unlock(); + return rds_ibdev; +} + +/* + * The IB stack is letting us know that a device is going away. This can + * happen if the underlying HCA driver is removed or if PCI hotplug is removing + * the pci function, for example. + * + * This can be called at any time and can be racing with any other RDS path. + */ +static void rds_ib_remove_one(struct ib_device *device, void *client_data) +{ + struct rds_ib_device *rds_ibdev = client_data; + + if (!rds_ibdev) + return; + + rds_ib_dev_shutdown(rds_ibdev); + + /* stop connection attempts from getting a reference to this device. */ + ib_set_client_data(device, &rds_ib_client, NULL); + + down_write(&rds_ib_devices_lock); + list_del_rcu(&rds_ibdev->list); + up_write(&rds_ib_devices_lock); + + /* + * This synchronize rcu is waiting for readers of both the ib + * client data and the devices list to finish before we drop + * both of those references. + */ + synchronize_rcu(); + rds_ib_dev_put(rds_ibdev); + rds_ib_dev_put(rds_ibdev); +} + +struct ib_client rds_ib_client = { + .name = "rds_ib", + .add = rds_ib_add_one, + .remove = rds_ib_remove_one +}; + +static int rds_ib_conn_info_visitor(struct rds_connection *conn, + void *buffer) +{ + struct rds_info_rdma_connection *iinfo = buffer; + struct rds_ib_connection *ic; + + /* We will only ever look at IB transports */ + if (conn->c_trans != &rds_ib_transport) + return 0; + if (conn->c_isv6) + return 0; + + iinfo->src_addr = conn->c_laddr.s6_addr32[3]; + iinfo->dst_addr = conn->c_faddr.s6_addr32[3]; + + memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid)); + memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid)); + if (rds_conn_state(conn) == RDS_CONN_UP) { + struct rds_ib_device *rds_ibdev; + + ic = conn->c_transport_data; + + rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo->src_gid, + (union ib_gid *)&iinfo->dst_gid); + + rds_ibdev = ic->rds_ibdev; + iinfo->max_send_wr = ic->i_send_ring.w_nr; + iinfo->max_recv_wr = ic->i_recv_ring.w_nr; + iinfo->max_send_sge = rds_ibdev->max_sge; + rds_ib_get_mr_info(rds_ibdev, iinfo); + } + return 1; +} + +#if IS_ENABLED(CONFIG_IPV6) +/* IPv6 version of rds_ib_conn_info_visitor(). */ +static int rds6_ib_conn_info_visitor(struct rds_connection *conn, + void *buffer) +{ + struct rds6_info_rdma_connection *iinfo6 = buffer; + struct rds_ib_connection *ic; + + /* We will only ever look at IB transports */ + if (conn->c_trans != &rds_ib_transport) + return 0; + + iinfo6->src_addr = conn->c_laddr; + iinfo6->dst_addr = conn->c_faddr; + + memset(&iinfo6->src_gid, 0, sizeof(iinfo6->src_gid)); + memset(&iinfo6->dst_gid, 0, sizeof(iinfo6->dst_gid)); + + if (rds_conn_state(conn) == RDS_CONN_UP) { + struct rds_ib_device *rds_ibdev; + + ic = conn->c_transport_data; + rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo6->src_gid, + (union ib_gid *)&iinfo6->dst_gid); + rds_ibdev = ic->rds_ibdev; + iinfo6->max_send_wr = ic->i_send_ring.w_nr; + iinfo6->max_recv_wr = ic->i_recv_ring.w_nr; + iinfo6->max_send_sge = rds_ibdev->max_sge; + rds6_ib_get_mr_info(rds_ibdev, iinfo6); + } + return 1; +} +#endif + +static void rds_ib_ic_info(struct socket *sock, unsigned int len, + struct rds_info_iterator *iter, + struct rds_info_lengths *lens) +{ + u64 buffer[(sizeof(struct rds_info_rdma_connection) + 7) / 8]; + + rds_for_each_conn_info(sock, len, iter, lens, + rds_ib_conn_info_visitor, + buffer, + sizeof(struct rds_info_rdma_connection)); +} + +#if IS_ENABLED(CONFIG_IPV6) +/* IPv6 version of rds_ib_ic_info(). */ +static void rds6_ib_ic_info(struct socket *sock, unsigned int len, + struct rds_info_iterator *iter, + struct rds_info_lengths *lens) +{ + u64 buffer[(sizeof(struct rds6_info_rdma_connection) + 7) / 8]; + + rds_for_each_conn_info(sock, len, iter, lens, + rds6_ib_conn_info_visitor, + buffer, + sizeof(struct rds6_info_rdma_connection)); +} +#endif + +/* + * Early RDS/IB was built to only bind to an address if there is an IPoIB + * device with that address set. + * + * If it were me, I'd advocate for something more flexible. Sending and + * receiving should be device-agnostic. Transports would try and maintain + * connections between peers who have messages queued. Userspace would be + * allowed to influence which paths have priority. We could call userspace + * asserting this policy "routing". + */ +static int rds_ib_laddr_check(struct net *net, const struct in6_addr *addr, + __u32 scope_id) +{ + int ret; + struct rdma_cm_id *cm_id; +#if IS_ENABLED(CONFIG_IPV6) + struct sockaddr_in6 sin6; +#endif + struct sockaddr_in sin; + struct sockaddr *sa; + bool isv4; + + isv4 = ipv6_addr_v4mapped(addr); + /* Create a CMA ID and try to bind it. This catches both + * IB and iWARP capable NICs. + */ + cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler, + NULL, RDMA_PS_TCP, IB_QPT_RC); + if (IS_ERR(cm_id)) + return PTR_ERR(cm_id); + + if (isv4) { + memset(&sin, 0, sizeof(sin)); + sin.sin_family = AF_INET; + sin.sin_addr.s_addr = addr->s6_addr32[3]; + sa = (struct sockaddr *)&sin; + } else { +#if IS_ENABLED(CONFIG_IPV6) + memset(&sin6, 0, sizeof(sin6)); + sin6.sin6_family = AF_INET6; + sin6.sin6_addr = *addr; + sin6.sin6_scope_id = scope_id; + sa = (struct sockaddr *)&sin6; + + /* XXX Do a special IPv6 link local address check here. The + * reason is that rdma_bind_addr() always succeeds with IPv6 + * link local address regardless it is indeed configured in a + * system. + */ + if (ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL) { + struct net_device *dev; + + if (scope_id == 0) { + ret = -EADDRNOTAVAIL; + goto out; + } + + /* Use init_net for now as RDS is not network + * name space aware. + */ + dev = dev_get_by_index(&init_net, scope_id); + if (!dev) { + ret = -EADDRNOTAVAIL; + goto out; + } + if (!ipv6_chk_addr(&init_net, addr, dev, 1)) { + dev_put(dev); + ret = -EADDRNOTAVAIL; + goto out; + } + dev_put(dev); + } +#else + ret = -EADDRNOTAVAIL; + goto out; +#endif + } + + /* rdma_bind_addr will only succeed for IB & iWARP devices */ + ret = rdma_bind_addr(cm_id, sa); + /* due to this, we will claim to support iWARP devices unless we + check node_type. */ + if (ret || !cm_id->device || + cm_id->device->node_type != RDMA_NODE_IB_CA) + ret = -EADDRNOTAVAIL; + + rdsdebug("addr %pI6c%%%u ret %d node type %d\n", + addr, scope_id, ret, + cm_id->device ? cm_id->device->node_type : -1); + +out: + rdma_destroy_id(cm_id); + + return ret; +} + +static void rds_ib_unregister_client(void) +{ + ib_unregister_client(&rds_ib_client); + /* wait for rds_ib_dev_free() to complete */ + flush_workqueue(rds_wq); +} + +static void rds_ib_set_unloading(void) +{ + atomic_set(&rds_ib_unloading, 1); +} + +static bool rds_ib_is_unloading(struct rds_connection *conn) +{ + struct rds_conn_path *cp = &conn->c_path[0]; + + return (test_bit(RDS_DESTROY_PENDING, &cp->cp_flags) || + atomic_read(&rds_ib_unloading) != 0); +} + +void rds_ib_exit(void) +{ + rds_ib_set_unloading(); + synchronize_rcu(); + rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info); +#if IS_ENABLED(CONFIG_IPV6) + rds_info_deregister_func(RDS6_INFO_IB_CONNECTIONS, rds6_ib_ic_info); +#endif + rds_ib_unregister_client(); + rds_ib_destroy_nodev_conns(); + rds_ib_sysctl_exit(); + rds_ib_recv_exit(); + rds_trans_unregister(&rds_ib_transport); + rds_ib_mr_exit(); +} + +struct rds_transport rds_ib_transport = { + .laddr_check = rds_ib_laddr_check, + .xmit_path_complete = rds_ib_xmit_path_complete, + .xmit = rds_ib_xmit, + .xmit_rdma = rds_ib_xmit_rdma, + .xmit_atomic = rds_ib_xmit_atomic, + .recv_path = rds_ib_recv_path, + .conn_alloc = rds_ib_conn_alloc, + .conn_free = rds_ib_conn_free, + .conn_path_connect = rds_ib_conn_path_connect, + .conn_path_shutdown = rds_ib_conn_path_shutdown, + .inc_copy_to_user = rds_ib_inc_copy_to_user, + .inc_free = rds_ib_inc_free, + .cm_initiate_connect = rds_ib_cm_initiate_connect, + .cm_handle_connect = rds_ib_cm_handle_connect, + .cm_connect_complete = rds_ib_cm_connect_complete, + .stats_info_copy = rds_ib_stats_info_copy, + .exit = rds_ib_exit, + .get_mr = rds_ib_get_mr, + .sync_mr = rds_ib_sync_mr, + .free_mr = rds_ib_free_mr, + .flush_mrs = rds_ib_flush_mrs, + .t_owner = THIS_MODULE, + .t_name = "infiniband", + .t_unloading = rds_ib_is_unloading, + .t_type = RDS_TRANS_IB +}; + +int rds_ib_init(void) +{ + int ret; + + INIT_LIST_HEAD(&rds_ib_devices); + + ret = rds_ib_mr_init(); + if (ret) + goto out; + + ret = ib_register_client(&rds_ib_client); + if (ret) + goto out_mr_exit; + + ret = rds_ib_sysctl_init(); + if (ret) + goto out_ibreg; + + ret = rds_ib_recv_init(); + if (ret) + goto out_sysctl; + + rds_trans_register(&rds_ib_transport); + + rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info); +#if IS_ENABLED(CONFIG_IPV6) + rds_info_register_func(RDS6_INFO_IB_CONNECTIONS, rds6_ib_ic_info); +#endif + + goto out; + +out_sysctl: + rds_ib_sysctl_exit(); +out_ibreg: + rds_ib_unregister_client(); +out_mr_exit: + rds_ib_mr_exit(); +out: + return ret; +} + +MODULE_LICENSE("GPL"); |