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 41 #include "rds.h" 42 #include "ib.h" 43 44 unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE; 45 unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */ 46 47 module_param(fmr_pool_size, int, 0444); 48 MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA"); 49 module_param(fmr_message_size, int, 0444); 50 MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer"); 51 52 struct list_head rds_ib_devices; 53 54 DEFINE_SPINLOCK(ib_nodev_conns_lock); 55 LIST_HEAD(ib_nodev_conns); 56 57 void rds_ib_add_one(struct ib_device *device) 58 { 59 struct rds_ib_device *rds_ibdev; 60 struct ib_device_attr *dev_attr; 61 62 /* Only handle IB (no iWARP) devices */ 63 if (device->node_type != RDMA_NODE_IB_CA) 64 return; 65 66 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); 67 if (!dev_attr) 68 return; 69 70 if (ib_query_device(device, dev_attr)) { 71 rdsdebug("Query device failed for %s\n", device->name); 72 goto free_attr; 73 } 74 75 rds_ibdev = kmalloc(sizeof *rds_ibdev, GFP_KERNEL); 76 if (!rds_ibdev) 77 goto free_attr; 78 79 spin_lock_init(&rds_ibdev->spinlock); 80 81 rds_ibdev->max_wrs = dev_attr->max_qp_wr; 82 rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE); 83 84 rds_ibdev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1); 85 rds_ibdev->fmr_page_size = 1 << rds_ibdev->fmr_page_shift; 86 rds_ibdev->fmr_page_mask = ~((u64) rds_ibdev->fmr_page_size - 1); 87 rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32; 88 rds_ibdev->max_fmrs = dev_attr->max_fmr ? 89 min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) : 90 fmr_pool_size; 91 92 rds_ibdev->dev = device; 93 rds_ibdev->pd = ib_alloc_pd(device); 94 if (IS_ERR(rds_ibdev->pd)) 95 goto free_dev; 96 97 rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd, 98 IB_ACCESS_LOCAL_WRITE); 99 if (IS_ERR(rds_ibdev->mr)) 100 goto err_pd; 101 102 rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev); 103 if (IS_ERR(rds_ibdev->mr_pool)) { 104 rds_ibdev->mr_pool = NULL; 105 goto err_mr; 106 } 107 108 INIT_LIST_HEAD(&rds_ibdev->ipaddr_list); 109 INIT_LIST_HEAD(&rds_ibdev->conn_list); 110 list_add_tail(&rds_ibdev->list, &rds_ib_devices); 111 112 ib_set_client_data(device, &rds_ib_client, rds_ibdev); 113 114 goto free_attr; 115 116 err_mr: 117 ib_dereg_mr(rds_ibdev->mr); 118 err_pd: 119 ib_dealloc_pd(rds_ibdev->pd); 120 free_dev: 121 kfree(rds_ibdev); 122 free_attr: 123 kfree(dev_attr); 124 } 125 126 void rds_ib_remove_one(struct ib_device *device) 127 { 128 struct rds_ib_device *rds_ibdev; 129 struct rds_ib_ipaddr *i_ipaddr, *i_next; 130 131 rds_ibdev = ib_get_client_data(device, &rds_ib_client); 132 if (!rds_ibdev) 133 return; 134 135 list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) { 136 list_del(&i_ipaddr->list); 137 kfree(i_ipaddr); 138 } 139 140 rds_ib_remove_conns(rds_ibdev); 141 142 if (rds_ibdev->mr_pool) 143 rds_ib_destroy_mr_pool(rds_ibdev->mr_pool); 144 145 ib_dereg_mr(rds_ibdev->mr); 146 147 while (ib_dealloc_pd(rds_ibdev->pd)) { 148 rdsdebug("Failed to dealloc pd %p\n", rds_ibdev->pd); 149 msleep(1); 150 } 151 152 list_del(&rds_ibdev->list); 153 kfree(rds_ibdev); 154 } 155 156 struct ib_client rds_ib_client = { 157 .name = "rds_ib", 158 .add = rds_ib_add_one, 159 .remove = rds_ib_remove_one 160 }; 161 162 static int rds_ib_conn_info_visitor(struct rds_connection *conn, 163 void *buffer) 164 { 165 struct rds_info_rdma_connection *iinfo = buffer; 166 struct rds_ib_connection *ic; 167 168 /* We will only ever look at IB transports */ 169 if (conn->c_trans != &rds_ib_transport) 170 return 0; 171 172 iinfo->src_addr = conn->c_laddr; 173 iinfo->dst_addr = conn->c_faddr; 174 175 memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid)); 176 memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid)); 177 if (rds_conn_state(conn) == RDS_CONN_UP) { 178 struct rds_ib_device *rds_ibdev; 179 struct rdma_dev_addr *dev_addr; 180 181 ic = conn->c_transport_data; 182 dev_addr = &ic->i_cm_id->route.addr.dev_addr; 183 184 ib_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid); 185 ib_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid); 186 187 rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client); 188 iinfo->max_send_wr = ic->i_send_ring.w_nr; 189 iinfo->max_recv_wr = ic->i_recv_ring.w_nr; 190 iinfo->max_send_sge = rds_ibdev->max_sge; 191 rds_ib_get_mr_info(rds_ibdev, iinfo); 192 } 193 return 1; 194 } 195 196 static void rds_ib_ic_info(struct socket *sock, unsigned int len, 197 struct rds_info_iterator *iter, 198 struct rds_info_lengths *lens) 199 { 200 rds_for_each_conn_info(sock, len, iter, lens, 201 rds_ib_conn_info_visitor, 202 sizeof(struct rds_info_rdma_connection)); 203 } 204 205 206 /* 207 * Early RDS/IB was built to only bind to an address if there is an IPoIB 208 * device with that address set. 209 * 210 * If it were me, I'd advocate for something more flexible. Sending and 211 * receiving should be device-agnostic. Transports would try and maintain 212 * connections between peers who have messages queued. Userspace would be 213 * allowed to influence which paths have priority. We could call userspace 214 * asserting this policy "routing". 215 */ 216 static int rds_ib_laddr_check(__be32 addr) 217 { 218 int ret; 219 struct rdma_cm_id *cm_id; 220 struct sockaddr_in sin; 221 222 /* Create a CMA ID and try to bind it. This catches both 223 * IB and iWARP capable NICs. 224 */ 225 cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP); 226 if (!cm_id) 227 return -EADDRNOTAVAIL; 228 229 memset(&sin, 0, sizeof(sin)); 230 sin.sin_family = AF_INET; 231 sin.sin_addr.s_addr = addr; 232 233 /* rdma_bind_addr will only succeed for IB & iWARP devices */ 234 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); 235 /* due to this, we will claim to support iWARP devices unless we 236 check node_type. */ 237 if (ret || cm_id->device->node_type != RDMA_NODE_IB_CA) 238 ret = -EADDRNOTAVAIL; 239 240 rdsdebug("addr %pI4 ret %d node type %d\n", 241 &addr, ret, 242 cm_id->device ? cm_id->device->node_type : -1); 243 244 rdma_destroy_id(cm_id); 245 246 return ret; 247 } 248 249 void rds_ib_exit(void) 250 { 251 rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info); 252 rds_ib_remove_nodev_conns(); 253 ib_unregister_client(&rds_ib_client); 254 rds_ib_sysctl_exit(); 255 rds_ib_recv_exit(); 256 rds_trans_unregister(&rds_ib_transport); 257 } 258 259 struct rds_transport rds_ib_transport = { 260 .laddr_check = rds_ib_laddr_check, 261 .xmit_complete = rds_ib_xmit_complete, 262 .xmit = rds_ib_xmit, 263 .xmit_cong_map = NULL, 264 .xmit_rdma = rds_ib_xmit_rdma, 265 .recv = rds_ib_recv, 266 .conn_alloc = rds_ib_conn_alloc, 267 .conn_free = rds_ib_conn_free, 268 .conn_connect = rds_ib_conn_connect, 269 .conn_shutdown = rds_ib_conn_shutdown, 270 .inc_copy_to_user = rds_ib_inc_copy_to_user, 271 .inc_purge = rds_ib_inc_purge, 272 .inc_free = rds_ib_inc_free, 273 .cm_initiate_connect = rds_ib_cm_initiate_connect, 274 .cm_handle_connect = rds_ib_cm_handle_connect, 275 .cm_connect_complete = rds_ib_cm_connect_complete, 276 .stats_info_copy = rds_ib_stats_info_copy, 277 .exit = rds_ib_exit, 278 .get_mr = rds_ib_get_mr, 279 .sync_mr = rds_ib_sync_mr, 280 .free_mr = rds_ib_free_mr, 281 .flush_mrs = rds_ib_flush_mrs, 282 .t_owner = THIS_MODULE, 283 .t_name = "infiniband", 284 }; 285 286 int __init rds_ib_init(void) 287 { 288 int ret; 289 290 INIT_LIST_HEAD(&rds_ib_devices); 291 292 ret = ib_register_client(&rds_ib_client); 293 if (ret) 294 goto out; 295 296 ret = rds_ib_sysctl_init(); 297 if (ret) 298 goto out_ibreg; 299 300 ret = rds_ib_recv_init(); 301 if (ret) 302 goto out_sysctl; 303 304 ret = rds_trans_register(&rds_ib_transport); 305 if (ret) 306 goto out_recv; 307 308 rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info); 309 310 goto out; 311 312 out_recv: 313 rds_ib_recv_exit(); 314 out_sysctl: 315 rds_ib_sysctl_exit(); 316 out_ibreg: 317 ib_unregister_client(&rds_ib_client); 318 out: 319 return ret; 320 } 321 322 MODULE_LICENSE("GPL"); 323 324