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 "ib.h" 44 45 unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE; 46 unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */ 47 unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT; 48 49 module_param(fmr_pool_size, int, 0444); 50 MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA"); 51 module_param(fmr_message_size, int, 0444); 52 MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer"); 53 module_param(rds_ib_retry_count, int, 0444); 54 MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error"); 55 56 struct list_head rds_ib_devices; 57 58 /* NOTE: if also grabbing ibdev lock, grab this first */ 59 DEFINE_SPINLOCK(ib_nodev_conns_lock); 60 LIST_HEAD(ib_nodev_conns); 61 62 void rds_ib_add_one(struct ib_device *device) 63 { 64 struct rds_ib_device *rds_ibdev; 65 struct ib_device_attr *dev_attr; 66 67 /* Only handle IB (no iWARP) devices */ 68 if (device->node_type != RDMA_NODE_IB_CA) 69 return; 70 71 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); 72 if (!dev_attr) 73 return; 74 75 if (ib_query_device(device, dev_attr)) { 76 rdsdebug("Query device failed for %s\n", device->name); 77 goto free_attr; 78 } 79 80 rds_ibdev = kmalloc(sizeof *rds_ibdev, GFP_KERNEL); 81 if (!rds_ibdev) 82 goto free_attr; 83 84 spin_lock_init(&rds_ibdev->spinlock); 85 86 rds_ibdev->max_wrs = dev_attr->max_qp_wr; 87 rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE); 88 89 rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32; 90 rds_ibdev->max_fmrs = dev_attr->max_fmr ? 91 min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) : 92 fmr_pool_size; 93 94 rds_ibdev->dev = device; 95 rds_ibdev->pd = ib_alloc_pd(device); 96 if (IS_ERR(rds_ibdev->pd)) 97 goto free_dev; 98 99 rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd, 100 IB_ACCESS_LOCAL_WRITE); 101 if (IS_ERR(rds_ibdev->mr)) 102 goto err_pd; 103 104 rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev); 105 if (IS_ERR(rds_ibdev->mr_pool)) { 106 rds_ibdev->mr_pool = NULL; 107 goto err_mr; 108 } 109 110 INIT_LIST_HEAD(&rds_ibdev->ipaddr_list); 111 INIT_LIST_HEAD(&rds_ibdev->conn_list); 112 list_add_tail(&rds_ibdev->list, &rds_ib_devices); 113 114 ib_set_client_data(device, &rds_ib_client, rds_ibdev); 115 116 goto free_attr; 117 118 err_mr: 119 ib_dereg_mr(rds_ibdev->mr); 120 err_pd: 121 ib_dealloc_pd(rds_ibdev->pd); 122 free_dev: 123 kfree(rds_ibdev); 124 free_attr: 125 kfree(dev_attr); 126 } 127 128 void rds_ib_remove_one(struct ib_device *device) 129 { 130 struct rds_ib_device *rds_ibdev; 131 struct rds_ib_ipaddr *i_ipaddr, *i_next; 132 133 rds_ibdev = ib_get_client_data(device, &rds_ib_client); 134 if (!rds_ibdev) 135 return; 136 137 list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) { 138 list_del(&i_ipaddr->list); 139 kfree(i_ipaddr); 140 } 141 142 rds_ib_destroy_conns(rds_ibdev); 143 144 if (rds_ibdev->mr_pool) 145 rds_ib_destroy_mr_pool(rds_ibdev->mr_pool); 146 147 ib_dereg_mr(rds_ibdev->mr); 148 149 while (ib_dealloc_pd(rds_ibdev->pd)) { 150 rdsdebug("Failed to dealloc pd %p\n", rds_ibdev->pd); 151 msleep(1); 152 } 153 154 list_del(&rds_ibdev->list); 155 kfree(rds_ibdev); 156 } 157 158 struct ib_client rds_ib_client = { 159 .name = "rds_ib", 160 .add = rds_ib_add_one, 161 .remove = rds_ib_remove_one 162 }; 163 164 static int rds_ib_conn_info_visitor(struct rds_connection *conn, 165 void *buffer) 166 { 167 struct rds_info_rdma_connection *iinfo = buffer; 168 struct rds_ib_connection *ic; 169 170 /* We will only ever look at IB transports */ 171 if (conn->c_trans != &rds_ib_transport) 172 return 0; 173 174 iinfo->src_addr = conn->c_laddr; 175 iinfo->dst_addr = conn->c_faddr; 176 177 memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid)); 178 memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid)); 179 if (rds_conn_state(conn) == RDS_CONN_UP) { 180 struct rds_ib_device *rds_ibdev; 181 struct rdma_dev_addr *dev_addr; 182 183 ic = conn->c_transport_data; 184 dev_addr = &ic->i_cm_id->route.addr.dev_addr; 185 186 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid); 187 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid); 188 189 rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client); 190 iinfo->max_send_wr = ic->i_send_ring.w_nr; 191 iinfo->max_recv_wr = ic->i_recv_ring.w_nr; 192 iinfo->max_send_sge = rds_ibdev->max_sge; 193 rds_ib_get_mr_info(rds_ibdev, iinfo); 194 } 195 return 1; 196 } 197 198 static void rds_ib_ic_info(struct socket *sock, unsigned int len, 199 struct rds_info_iterator *iter, 200 struct rds_info_lengths *lens) 201 { 202 rds_for_each_conn_info(sock, len, iter, lens, 203 rds_ib_conn_info_visitor, 204 sizeof(struct rds_info_rdma_connection)); 205 } 206 207 208 /* 209 * Early RDS/IB was built to only bind to an address if there is an IPoIB 210 * device with that address set. 211 * 212 * If it were me, I'd advocate for something more flexible. Sending and 213 * receiving should be device-agnostic. Transports would try and maintain 214 * connections between peers who have messages queued. Userspace would be 215 * allowed to influence which paths have priority. We could call userspace 216 * asserting this policy "routing". 217 */ 218 static int rds_ib_laddr_check(__be32 addr) 219 { 220 int ret; 221 struct rdma_cm_id *cm_id; 222 struct sockaddr_in sin; 223 224 /* Create a CMA ID and try to bind it. This catches both 225 * IB and iWARP capable NICs. 226 */ 227 cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP); 228 if (IS_ERR(cm_id)) 229 return PTR_ERR(cm_id); 230 231 memset(&sin, 0, sizeof(sin)); 232 sin.sin_family = AF_INET; 233 sin.sin_addr.s_addr = addr; 234 235 /* rdma_bind_addr will only succeed for IB & iWARP devices */ 236 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); 237 /* due to this, we will claim to support iWARP devices unless we 238 check node_type. */ 239 if (ret || cm_id->device->node_type != RDMA_NODE_IB_CA) 240 ret = -EADDRNOTAVAIL; 241 242 rdsdebug("addr %pI4 ret %d node type %d\n", 243 &addr, ret, 244 cm_id->device ? cm_id->device->node_type : -1); 245 246 rdma_destroy_id(cm_id); 247 248 return ret; 249 } 250 251 void rds_ib_exit(void) 252 { 253 rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info); 254 rds_ib_destroy_nodev_conns(); 255 ib_unregister_client(&rds_ib_client); 256 rds_ib_sysctl_exit(); 257 rds_ib_recv_exit(); 258 rds_trans_unregister(&rds_ib_transport); 259 } 260 261 struct rds_transport rds_ib_transport = { 262 .laddr_check = rds_ib_laddr_check, 263 .xmit_complete = rds_ib_xmit_complete, 264 .xmit = rds_ib_xmit, 265 .xmit_cong_map = NULL, 266 .xmit_rdma = rds_ib_xmit_rdma, 267 .recv = rds_ib_recv, 268 .conn_alloc = rds_ib_conn_alloc, 269 .conn_free = rds_ib_conn_free, 270 .conn_connect = rds_ib_conn_connect, 271 .conn_shutdown = rds_ib_conn_shutdown, 272 .inc_copy_to_user = rds_ib_inc_copy_to_user, 273 .inc_purge = rds_ib_inc_purge, 274 .inc_free = rds_ib_inc_free, 275 .cm_initiate_connect = rds_ib_cm_initiate_connect, 276 .cm_handle_connect = rds_ib_cm_handle_connect, 277 .cm_connect_complete = rds_ib_cm_connect_complete, 278 .stats_info_copy = rds_ib_stats_info_copy, 279 .exit = rds_ib_exit, 280 .get_mr = rds_ib_get_mr, 281 .sync_mr = rds_ib_sync_mr, 282 .free_mr = rds_ib_free_mr, 283 .flush_mrs = rds_ib_flush_mrs, 284 .t_owner = THIS_MODULE, 285 .t_name = "infiniband", 286 .t_type = RDS_TRANS_IB 287 }; 288 289 int __init rds_ib_init(void) 290 { 291 int ret; 292 293 INIT_LIST_HEAD(&rds_ib_devices); 294 295 ret = ib_register_client(&rds_ib_client); 296 if (ret) 297 goto out; 298 299 ret = rds_ib_sysctl_init(); 300 if (ret) 301 goto out_ibreg; 302 303 ret = rds_ib_recv_init(); 304 if (ret) 305 goto out_sysctl; 306 307 ret = rds_trans_register(&rds_ib_transport); 308 if (ret) 309 goto out_recv; 310 311 rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info); 312 313 goto out; 314 315 out_recv: 316 rds_ib_recv_exit(); 317 out_sysctl: 318 rds_ib_sysctl_exit(); 319 out_ibreg: 320 ib_unregister_client(&rds_ib_client); 321 out: 322 return ret; 323 } 324 325 MODULE_LICENSE("GPL"); 326 327