/* * 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 "iw.h" unsigned int fastreg_pool_size = RDS_FASTREG_POOL_SIZE; unsigned int fastreg_message_size = RDS_FASTREG_SIZE + 1; /* +1 allows for unaligned MRs */ module_param(fastreg_pool_size, int, 0444); MODULE_PARM_DESC(fastreg_pool_size, " Max number of fastreg MRs per device"); module_param(fastreg_message_size, int, 0444); MODULE_PARM_DESC(fastreg_message_size, " Max size of a RDMA transfer (fastreg MRs)"); struct list_head rds_iw_devices; /* NOTE: if also grabbing iwdev lock, grab this first */ DEFINE_SPINLOCK(iw_nodev_conns_lock); LIST_HEAD(iw_nodev_conns); static void rds_iw_add_one(struct ib_device *device) { struct rds_iw_device *rds_iwdev; struct ib_device_attr *dev_attr; /* Only handle iwarp devices */ if (device->node_type != RDMA_NODE_RNIC) 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_iwdev = kmalloc(sizeof *rds_iwdev, GFP_KERNEL); if (!rds_iwdev) goto free_attr; spin_lock_init(&rds_iwdev->spinlock); rds_iwdev->dma_local_lkey = !!(dev_attr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY); rds_iwdev->max_wrs = dev_attr->max_qp_wr; rds_iwdev->max_sge = min(dev_attr->max_sge, RDS_IW_MAX_SGE); rds_iwdev->dev = device; rds_iwdev->pd = ib_alloc_pd(device); if (IS_ERR(rds_iwdev->pd)) goto free_dev; if (!rds_iwdev->dma_local_lkey) { rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd, IB_ACCESS_REMOTE_READ | IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE); if (IS_ERR(rds_iwdev->mr)) goto err_pd; } else rds_iwdev->mr = NULL; rds_iwdev->mr_pool = rds_iw_create_mr_pool(rds_iwdev); if (IS_ERR(rds_iwdev->mr_pool)) { rds_iwdev->mr_pool = NULL; goto err_mr; } INIT_LIST_HEAD(&rds_iwdev->cm_id_list); INIT_LIST_HEAD(&rds_iwdev->conn_list); list_add_tail(&rds_iwdev->list, &rds_iw_devices); ib_set_client_data(device, &rds_iw_client, rds_iwdev); goto free_attr; err_mr: if (rds_iwdev->mr) ib_dereg_mr(rds_iwdev->mr); err_pd: ib_dealloc_pd(rds_iwdev->pd); free_dev: kfree(rds_iwdev); free_attr: kfree(dev_attr); } static void rds_iw_remove_one(struct ib_device *device) { struct rds_iw_device *rds_iwdev; struct rds_iw_cm_id *i_cm_id, *next; rds_iwdev = ib_get_client_data(device, &rds_iw_client); if (!rds_iwdev) return; spin_lock_irq(&rds_iwdev->spinlock); list_for_each_entry_safe(i_cm_id, next, &rds_iwdev->cm_id_list, list) { list_del(&i_cm_id->list); kfree(i_cm_id); } spin_unlock_irq(&rds_iwdev->spinlock); rds_iw_destroy_conns(rds_iwdev); if (rds_iwdev->mr_pool) rds_iw_destroy_mr_pool(rds_iwdev->mr_pool); if (rds_iwdev->mr) ib_dereg_mr(rds_iwdev->mr); while (ib_dealloc_pd(rds_iwdev->pd)) { rdsdebug("Failed to dealloc pd %p\n", rds_iwdev->pd); msleep(1); } list_del(&rds_iwdev->list); kfree(rds_iwdev); } struct ib_client rds_iw_client = { .name = "rds_iw", .add = rds_iw_add_one, .remove = rds_iw_remove_one }; static int rds_iw_conn_info_visitor(struct rds_connection *conn, void *buffer) { struct rds_info_rdma_connection *iinfo = buffer; struct rds_iw_connection *ic; /* We will only ever look at IB transports */ if (conn->c_trans != &rds_iw_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_iw_device *rds_iwdev; 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_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client); 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_iwdev->max_sge; rds_iw_get_mr_info(rds_iwdev, iinfo); } return 1; } static void rds_iw_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_iw_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_iw_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, IB_QPT_RC); 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 IB devices unless we check node_type. */ if (ret || cm_id->device->node_type != RDMA_NODE_RNIC) 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_iw_exit(void) { rds_info_deregister_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info); rds_iw_destroy_nodev_conns(); ib_unregister_client(&rds_iw_client); rds_iw_sysctl_exit(); rds_iw_recv_exit(); rds_trans_unregister(&rds_iw_transport); } struct rds_transport rds_iw_transport = { .laddr_check = rds_iw_laddr_check, .xmit_complete = rds_iw_xmit_complete, .xmit = rds_iw_xmit, .xmit_rdma = rds_iw_xmit_rdma, .recv = rds_iw_recv, .conn_alloc = rds_iw_conn_alloc, .conn_free = rds_iw_conn_free, .conn_connect = rds_iw_conn_connect, .conn_shutdown = rds_iw_conn_shutdown, .inc_copy_to_user = rds_iw_inc_copy_to_user, .inc_free = rds_iw_inc_free, .cm_initiate_connect = rds_iw_cm_initiate_connect, .cm_handle_connect = rds_iw_cm_handle_connect, .cm_connect_complete = rds_iw_cm_connect_complete, .stats_info_copy = rds_iw_stats_info_copy, .exit = rds_iw_exit, .get_mr = rds_iw_get_mr, .sync_mr = rds_iw_sync_mr, .free_mr = rds_iw_free_mr, .flush_mrs = rds_iw_flush_mrs, .t_owner = THIS_MODULE, .t_name = "iwarp", .t_type = RDS_TRANS_IWARP, .t_prefer_loopback = 1, }; int rds_iw_init(void) { int ret; INIT_LIST_HEAD(&rds_iw_devices); ret = ib_register_client(&rds_iw_client); if (ret) goto out; ret = rds_iw_sysctl_init(); if (ret) goto out_ibreg; ret = rds_iw_recv_init(); if (ret) goto out_sysctl; ret = rds_trans_register(&rds_iw_transport); if (ret) goto out_recv; rds_info_register_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info); goto out; out_recv: rds_iw_recv_exit(); out_sysctl: rds_iw_sysctl_exit(); out_ibreg: ib_unregister_client(&rds_iw_client); out: return ret; } MODULE_LICENSE("GPL");