| /* |
| * Copyright (c) 2006 Oracle. 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 "rds.h" |
| #include "ib.h" |
| |
| unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE; |
| unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */ |
| unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT; |
| |
| module_param(fmr_pool_size, int, 0444); |
| MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA"); |
| module_param(fmr_message_size, int, 0444); |
| MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer"); |
| module_param(rds_ib_retry_count, int, 0444); |
| MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error"); |
| |
| 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); |
| |
| /* |
| * 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_pool) |
| rds_ib_destroy_mr_pool(rds_ibdev->mr_pool); |
| if (rds_ibdev->mr) |
| ib_dereg_mr(rds_ibdev->mr); |
| 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); |
| } |
| |
| void rds_ib_dev_put(struct rds_ib_device *rds_ibdev) |
| { |
| BUG_ON(atomic_read(&rds_ibdev->refcount) <= 0); |
| if (atomic_dec_and_test(&rds_ibdev->refcount)) |
| queue_work(rds_wq, &rds_ibdev->free_work); |
| } |
| |
| void rds_ib_add_one(struct ib_device *device) |
| { |
| struct rds_ib_device *rds_ibdev; |
| struct ib_device_attr *dev_attr; |
| |
| /* Only handle IB (no iWARP) devices */ |
| if (device->node_type != RDMA_NODE_IB_CA) |
| return; |
| |
| dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); |
| if (!dev_attr) |
| return; |
| |
| if (ib_query_device(device, dev_attr)) { |
| rdsdebug("Query device failed for %s\n", device->name); |
| goto free_attr; |
| } |
| |
| rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL, |
| ibdev_to_node(device)); |
| if (!rds_ibdev) |
| goto free_attr; |
| |
| spin_lock_init(&rds_ibdev->spinlock); |
| atomic_set(&rds_ibdev->refcount, 1); |
| INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free); |
| |
| rds_ibdev->max_wrs = dev_attr->max_qp_wr; |
| rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE); |
| |
| rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32; |
| rds_ibdev->max_fmrs = dev_attr->max_fmr ? |
| min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) : |
| fmr_pool_size; |
| |
| rds_ibdev->max_initiator_depth = dev_attr->max_qp_init_rd_atom; |
| rds_ibdev->max_responder_resources = dev_attr->max_qp_rd_atom; |
| |
| rds_ibdev->dev = device; |
| rds_ibdev->pd = ib_alloc_pd(device); |
| if (IS_ERR(rds_ibdev->pd)) { |
| rds_ibdev->pd = NULL; |
| goto put_dev; |
| } |
| |
| rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd, IB_ACCESS_LOCAL_WRITE); |
| if (IS_ERR(rds_ibdev->mr)) { |
| rds_ibdev->mr = NULL; |
| goto put_dev; |
| } |
| |
| rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev); |
| if (IS_ERR(rds_ibdev->mr_pool)) { |
| rds_ibdev->mr_pool = NULL; |
| goto put_dev; |
| } |
| |
| INIT_LIST_HEAD(&rds_ibdev->ipaddr_list); |
| INIT_LIST_HEAD(&rds_ibdev->conn_list); |
| list_add_tail(&rds_ibdev->list, &rds_ib_devices); |
| atomic_inc(&rds_ibdev->refcount); |
| |
| ib_set_client_data(device, &rds_ib_client, rds_ibdev); |
| atomic_inc(&rds_ibdev->refcount); |
| |
| put_dev: |
| rds_ib_dev_put(rds_ibdev); |
| free_attr: |
| kfree(dev_attr); |
| } |
| |
| /* |
| * 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) |
| atomic_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. |
| */ |
| void rds_ib_remove_one(struct ib_device *device) |
| { |
| struct rds_ib_device *rds_ibdev; |
| |
| rds_ibdev = ib_get_client_data(device, &rds_ib_client); |
| if (!rds_ibdev) |
| return; |
| |
| rds_ib_destroy_conns(rds_ibdev); |
| |
| /* |
| * prevent future connection attempts from getting a reference to this |
| * device and wait for currently racing connection attempts to finish |
| * getting their reference |
| */ |
| ib_set_client_data(device, &rds_ib_client, NULL); |
| synchronize_rcu(); |
| rds_ib_dev_put(rds_ibdev); |
| |
| list_del(&rds_ibdev->list); |
| 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; |
| |
| iinfo->src_addr = conn->c_laddr; |
| iinfo->dst_addr = conn->c_faddr; |
| |
| 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; |
| struct rdma_dev_addr *dev_addr; |
| |
| ic = conn->c_transport_data; |
| dev_addr = &ic->i_cm_id->route.addr.dev_addr; |
| |
| rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid); |
| rdma_addr_get_dgid(dev_addr, (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; |
| } |
| |
| static void rds_ib_ic_info(struct socket *sock, unsigned int len, |
| struct rds_info_iterator *iter, |
| struct rds_info_lengths *lens) |
| { |
| rds_for_each_conn_info(sock, len, iter, lens, |
| rds_ib_conn_info_visitor, |
| sizeof(struct rds_info_rdma_connection)); |
| } |
| |
| |
| /* |
| * 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(__be32 addr) |
| { |
| int ret; |
| struct rdma_cm_id *cm_id; |
| struct sockaddr_in sin; |
| |
| /* Create a CMA ID and try to bind it. This catches both |
| * IB and iWARP capable NICs. |
| */ |
| cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP); |
| if (IS_ERR(cm_id)) |
| return PTR_ERR(cm_id); |
| |
| memset(&sin, 0, sizeof(sin)); |
| sin.sin_family = AF_INET; |
| sin.sin_addr.s_addr = addr; |
| |
| /* rdma_bind_addr will only succeed for IB & iWARP devices */ |
| ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); |
| /* due to this, we will claim to support iWARP devices unless we |
| check node_type. */ |
| if (ret || cm_id->device->node_type != RDMA_NODE_IB_CA) |
| ret = -EADDRNOTAVAIL; |
| |
| rdsdebug("addr %pI4 ret %d node type %d\n", |
| &addr, ret, |
| cm_id->device ? cm_id->device->node_type : -1); |
| |
| rdma_destroy_id(cm_id); |
| |
| return ret; |
| } |
| |
| void rds_ib_exit(void) |
| { |
| rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info); |
| rds_ib_destroy_nodev_conns(); |
| ib_unregister_client(&rds_ib_client); |
| rds_ib_sysctl_exit(); |
| rds_ib_recv_exit(); |
| rds_trans_unregister(&rds_ib_transport); |
| } |
| |
| struct rds_transport rds_ib_transport = { |
| .laddr_check = rds_ib_laddr_check, |
| .xmit_complete = rds_ib_xmit_complete, |
| .xmit = rds_ib_xmit, |
| .xmit_rdma = rds_ib_xmit_rdma, |
| .xmit_atomic = rds_ib_xmit_atomic, |
| .recv = rds_ib_recv, |
| .conn_alloc = rds_ib_conn_alloc, |
| .conn_free = rds_ib_conn_free, |
| .conn_connect = rds_ib_conn_connect, |
| .conn_shutdown = rds_ib_conn_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_type = RDS_TRANS_IB |
| }; |
| |
| int __init rds_ib_init(void) |
| { |
| int ret; |
| |
| INIT_LIST_HEAD(&rds_ib_devices); |
| |
| ret = ib_register_client(&rds_ib_client); |
| if (ret) |
| goto out; |
| |
| ret = rds_ib_sysctl_init(); |
| if (ret) |
| goto out_ibreg; |
| |
| ret = rds_ib_recv_init(); |
| if (ret) |
| goto out_sysctl; |
| |
| ret = rds_trans_register(&rds_ib_transport); |
| if (ret) |
| goto out_recv; |
| |
| rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info); |
| |
| goto out; |
| |
| out_recv: |
| rds_ib_recv_exit(); |
| out_sysctl: |
| rds_ib_sysctl_exit(); |
| out_ibreg: |
| ib_unregister_client(&rds_ib_client); |
| out: |
| return ret; |
| } |
| |
| MODULE_LICENSE("GPL"); |
| |