1/* 2 * Copyright (c) 2006 Oracle. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 * 32 */ 33#include <linux/kernel.h> 34#include <linux/in.h> 35#include <linux/if.h> 36#include <linux/netdevice.h> 37#include <linux/inetdevice.h> 38#include <linux/if_arp.h> 39#include <linux/delay.h> 40#include <linux/slab.h> 41 42#include "rds.h" 43#include "iw.h" 44 45unsigned int fastreg_pool_size = RDS_FASTREG_POOL_SIZE; 46unsigned int fastreg_message_size = RDS_FASTREG_SIZE + 1; /* +1 allows for unaligned MRs */ 47 48module_param(fastreg_pool_size, int, 0444); 49MODULE_PARM_DESC(fastreg_pool_size, " Max number of fastreg MRs per device"); 50module_param(fastreg_message_size, int, 0444); 51MODULE_PARM_DESC(fastreg_message_size, " Max size of a RDMA transfer (fastreg MRs)"); 52 53struct list_head rds_iw_devices; 54 55/* NOTE: if also grabbing iwdev lock, grab this first */ 56DEFINE_SPINLOCK(iw_nodev_conns_lock); 57LIST_HEAD(iw_nodev_conns); 58 59void rds_iw_add_one(struct ib_device *device) 60{ 61 struct rds_iw_device *rds_iwdev; 62 struct ib_device_attr *dev_attr; 63 64 /* Only handle iwarp devices */ 65 if (device->node_type != RDMA_NODE_RNIC) 66 return; 67 68 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); 69 if (!dev_attr) 70 return; 71 72 if (ib_query_device(device, dev_attr)) { 73 rdsdebug("Query device failed for %s\n", device->name); 74 goto free_attr; 75 } 76 77 rds_iwdev = kmalloc(sizeof *rds_iwdev, GFP_KERNEL); 78 if (!rds_iwdev) 79 goto free_attr; 80 81 spin_lock_init(&rds_iwdev->spinlock); 82 83 rds_iwdev->dma_local_lkey = !!(dev_attr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY); 84 rds_iwdev->max_wrs = dev_attr->max_qp_wr; 85 rds_iwdev->max_sge = min(dev_attr->max_sge, RDS_IW_MAX_SGE); 86 87 rds_iwdev->dev = device; 88 rds_iwdev->pd = ib_alloc_pd(device); 89 if (IS_ERR(rds_iwdev->pd)) 90 goto free_dev; 91 92 if (!rds_iwdev->dma_local_lkey) { 93 rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd, 94 IB_ACCESS_REMOTE_READ | 95 IB_ACCESS_REMOTE_WRITE | 96 IB_ACCESS_LOCAL_WRITE); 97 if (IS_ERR(rds_iwdev->mr)) 98 goto err_pd; 99 } else 100 rds_iwdev->mr = NULL; 101 102 rds_iwdev->mr_pool = rds_iw_create_mr_pool(rds_iwdev); 103 if (IS_ERR(rds_iwdev->mr_pool)) { 104 rds_iwdev->mr_pool = NULL; 105 goto err_mr; 106 } 107 108 INIT_LIST_HEAD(&rds_iwdev->cm_id_list); 109 INIT_LIST_HEAD(&rds_iwdev->conn_list); 110 list_add_tail(&rds_iwdev->list, &rds_iw_devices); 111 112 ib_set_client_data(device, &rds_iw_client, rds_iwdev); 113 114 goto free_attr; 115 116err_mr: 117 if (rds_iwdev->mr) 118 ib_dereg_mr(rds_iwdev->mr); 119err_pd: 120 ib_dealloc_pd(rds_iwdev->pd); 121free_dev: 122 kfree(rds_iwdev); 123free_attr: 124 kfree(dev_attr); 125} 126 127void rds_iw_remove_one(struct ib_device *device) 128{ 129 struct rds_iw_device *rds_iwdev; 130 struct rds_iw_cm_id *i_cm_id, *next; 131 132 rds_iwdev = ib_get_client_data(device, &rds_iw_client); 133 if (!rds_iwdev) 134 return; 135 136 spin_lock_irq(&rds_iwdev->spinlock); 137 list_for_each_entry_safe(i_cm_id, next, &rds_iwdev->cm_id_list, list) { 138 list_del(&i_cm_id->list); 139 kfree(i_cm_id); 140 } 141 spin_unlock_irq(&rds_iwdev->spinlock); 142 143 rds_iw_destroy_conns(rds_iwdev); 144 145 if (rds_iwdev->mr_pool) 146 rds_iw_destroy_mr_pool(rds_iwdev->mr_pool); 147 148 if (rds_iwdev->mr) 149 ib_dereg_mr(rds_iwdev->mr); 150 151 while (ib_dealloc_pd(rds_iwdev->pd)) { 152 rdsdebug("Failed to dealloc pd %p\n", rds_iwdev->pd); 153 msleep(1); 154 } 155 156 list_del(&rds_iwdev->list); 157 kfree(rds_iwdev); 158} 159 160struct ib_client rds_iw_client = { 161 .name = "rds_iw", 162 .add = rds_iw_add_one, 163 .remove = rds_iw_remove_one 164}; 165 166static int rds_iw_conn_info_visitor(struct rds_connection *conn, 167 void *buffer) 168{ 169 struct rds_info_rdma_connection *iinfo = buffer; 170 struct rds_iw_connection *ic; 171 172 /* We will only ever look at IB transports */ 173 if (conn->c_trans != &rds_iw_transport) 174 return 0; 175 176 iinfo->src_addr = conn->c_laddr; 177 iinfo->dst_addr = conn->c_faddr; 178 179 memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid)); 180 memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid)); 181 if (rds_conn_state(conn) == RDS_CONN_UP) { 182 struct rds_iw_device *rds_iwdev; 183 struct rdma_dev_addr *dev_addr; 184 185 ic = conn->c_transport_data; 186 dev_addr = &ic->i_cm_id->route.addr.dev_addr; 187 188 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid); 189 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid); 190 191 rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client); 192 iinfo->max_send_wr = ic->i_send_ring.w_nr; 193 iinfo->max_recv_wr = ic->i_recv_ring.w_nr; 194 iinfo->max_send_sge = rds_iwdev->max_sge; 195 rds_iw_get_mr_info(rds_iwdev, iinfo); 196 } 197 return 1; 198} 199 200static void rds_iw_ic_info(struct socket *sock, unsigned int len, 201 struct rds_info_iterator *iter, 202 struct rds_info_lengths *lens) 203{ 204 rds_for_each_conn_info(sock, len, iter, lens, 205 rds_iw_conn_info_visitor, 206 sizeof(struct rds_info_rdma_connection)); 207} 208 209 210/* 211 * Early RDS/IB was built to only bind to an address if there is an IPoIB 212 * device with that address set. 213 * 214 * If it were me, I'd advocate for something more flexible. Sending and 215 * receiving should be device-agnostic. Transports would try and maintain 216 * connections between peers who have messages queued. Userspace would be 217 * allowed to influence which paths have priority. We could call userspace 218 * asserting this policy "routing". 219 */ 220static int rds_iw_laddr_check(__be32 addr) 221{ 222 int ret; 223 struct rdma_cm_id *cm_id; 224 struct sockaddr_in sin; 225 226 /* Create a CMA ID and try to bind it. This catches both 227 * IB and iWARP capable NICs. 228 */ 229 cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP); 230 if (IS_ERR(cm_id)) 231 return PTR_ERR(cm_id); 232 233 memset(&sin, 0, sizeof(sin)); 234 sin.sin_family = AF_INET; 235 sin.sin_addr.s_addr = addr; 236 237 /* rdma_bind_addr will only succeed for IB & iWARP devices */ 238 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); 239 /* due to this, we will claim to support IB devices unless we 240 check node_type. */ 241 if (ret || cm_id->device->node_type != RDMA_NODE_RNIC) 242 ret = -EADDRNOTAVAIL; 243 244 rdsdebug("addr %pI4 ret %d node type %d\n", 245 &addr, ret, 246 cm_id->device ? cm_id->device->node_type : -1); 247 248 rdma_destroy_id(cm_id); 249 250 return ret; 251} 252 253void rds_iw_exit(void) 254{ 255 rds_info_deregister_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info); 256 rds_iw_destroy_nodev_conns(); 257 ib_unregister_client(&rds_iw_client); 258 rds_iw_sysctl_exit(); 259 rds_iw_recv_exit(); 260 rds_trans_unregister(&rds_iw_transport); 261} 262 263struct rds_transport rds_iw_transport = { 264 .laddr_check = rds_iw_laddr_check, 265 .xmit_complete = rds_iw_xmit_complete, 266 .xmit = rds_iw_xmit, 267 .xmit_cong_map = NULL, 268 .xmit_rdma = rds_iw_xmit_rdma, 269 .recv = rds_iw_recv, 270 .conn_alloc = rds_iw_conn_alloc, 271 .conn_free = rds_iw_conn_free, 272 .conn_connect = rds_iw_conn_connect, 273 .conn_shutdown = rds_iw_conn_shutdown, 274 .inc_copy_to_user = rds_iw_inc_copy_to_user, 275 .inc_purge = rds_iw_inc_purge, 276 .inc_free = rds_iw_inc_free, 277 .cm_initiate_connect = rds_iw_cm_initiate_connect, 278 .cm_handle_connect = rds_iw_cm_handle_connect, 279 .cm_connect_complete = rds_iw_cm_connect_complete, 280 .stats_info_copy = rds_iw_stats_info_copy, 281 .exit = rds_iw_exit, 282 .get_mr = rds_iw_get_mr, 283 .sync_mr = rds_iw_sync_mr, 284 .free_mr = rds_iw_free_mr, 285 .flush_mrs = rds_iw_flush_mrs, 286 .t_owner = THIS_MODULE, 287 .t_name = "iwarp", 288 .t_type = RDS_TRANS_IWARP, 289 .t_prefer_loopback = 1, 290}; 291 292int __init rds_iw_init(void) 293{ 294 int ret; 295 296 INIT_LIST_HEAD(&rds_iw_devices); 297 298 ret = ib_register_client(&rds_iw_client); 299 if (ret) 300 goto out; 301 302 ret = rds_iw_sysctl_init(); 303 if (ret) 304 goto out_ibreg; 305 306 ret = rds_iw_recv_init(); 307 if (ret) 308 goto out_sysctl; 309 310 ret = rds_trans_register(&rds_iw_transport); 311 if (ret) 312 goto out_recv; 313 314 rds_info_register_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info); 315 316 goto out; 317 318out_recv: 319 rds_iw_recv_exit(); 320out_sysctl: 321 rds_iw_sysctl_exit(); 322out_ibreg: 323 ib_unregister_client(&rds_iw_client); 324out: 325 return ret; 326} 327 328MODULE_LICENSE("GPL"); 329