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 /* NOTE: if also grabbing ibdev lock, grab this first */ 55 DEFINE_SPINLOCK(ib_nodev_conns_lock); 56 LIST_HEAD(ib_nodev_conns); 57 58 void rds_ib_add_one(struct ib_device *device) 59 { 60 struct rds_ib_device *rds_ibdev; 61 struct ib_device_attr *dev_attr; 62 63 /* Only handle IB (no iWARP) devices */ 64 if (device->node_type != RDMA_NODE_IB_CA) 65 return; 66 67 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL); 68 if (!dev_attr) 69 return; 70 71 if (ib_query_device(device, dev_attr)) { 72 rdsdebug("Query device failed for %s\n", device->name); 73 goto free_attr; 74 } 75 76 rds_ibdev = kmalloc(sizeof *rds_ibdev, GFP_KERNEL); 77 if (!rds_ibdev) 78 goto free_attr; 79 80 spin_lock_init(&rds_ibdev->spinlock); 81 82 rds_ibdev->max_wrs = dev_attr->max_qp_wr; 83 rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE); 84 85 rds_ibdev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1); 86 rds_ibdev->fmr_page_size = 1 << rds_ibdev->fmr_page_shift; 87 rds_ibdev->fmr_page_mask = ~((u64) rds_ibdev->fmr_page_size - 1); 88 rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32; 89 rds_ibdev->max_fmrs = dev_attr->max_fmr ? 90 min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) : 91 fmr_pool_size; 92 93 rds_ibdev->dev = device; 94 rds_ibdev->pd = ib_alloc_pd(device); 95 if (IS_ERR(rds_ibdev->pd)) 96 goto free_dev; 97 98 rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd, 99 IB_ACCESS_LOCAL_WRITE); 100 if (IS_ERR(rds_ibdev->mr)) 101 goto err_pd; 102 103 rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev); 104 if (IS_ERR(rds_ibdev->mr_pool)) { 105 rds_ibdev->mr_pool = NULL; 106 goto err_mr; 107 } 108 109 INIT_LIST_HEAD(&rds_ibdev->ipaddr_list); 110 INIT_LIST_HEAD(&rds_ibdev->conn_list); 111 list_add_tail(&rds_ibdev->list, &rds_ib_devices); 112 113 ib_set_client_data(device, &rds_ib_client, rds_ibdev); 114 115 goto free_attr; 116 117 err_mr: 118 ib_dereg_mr(rds_ibdev->mr); 119 err_pd: 120 ib_dealloc_pd(rds_ibdev->pd); 121 free_dev: 122 kfree(rds_ibdev); 123 free_attr: 124 kfree(dev_attr); 125 } 126 127 void rds_ib_remove_one(struct ib_device *device) 128 { 129 struct rds_ib_device *rds_ibdev; 130 struct rds_ib_ipaddr *i_ipaddr, *i_next; 131 132 rds_ibdev = ib_get_client_data(device, &rds_ib_client); 133 if (!rds_ibdev) 134 return; 135 136 list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) { 137 list_del(&i_ipaddr->list); 138 kfree(i_ipaddr); 139 } 140 141 rds_ib_destroy_conns(rds_ibdev); 142 143 if (rds_ibdev->mr_pool) 144 rds_ib_destroy_mr_pool(rds_ibdev->mr_pool); 145 146 ib_dereg_mr(rds_ibdev->mr); 147 148 while (ib_dealloc_pd(rds_ibdev->pd)) { 149 rdsdebug("Failed to dealloc pd %p\n", rds_ibdev->pd); 150 msleep(1); 151 } 152 153 list_del(&rds_ibdev->list); 154 kfree(rds_ibdev); 155 } 156 157 struct ib_client rds_ib_client = { 158 .name = "rds_ib", 159 .add = rds_ib_add_one, 160 .remove = rds_ib_remove_one 161 }; 162 163 static int rds_ib_conn_info_visitor(struct rds_connection *conn, 164 void *buffer) 165 { 166 struct rds_info_rdma_connection *iinfo = buffer; 167 struct rds_ib_connection *ic; 168 169 /* We will only ever look at IB transports */ 170 if (conn->c_trans != &rds_ib_transport) 171 return 0; 172 173 iinfo->src_addr = conn->c_laddr; 174 iinfo->dst_addr = conn->c_faddr; 175 176 memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid)); 177 memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid)); 178 if (rds_conn_state(conn) == RDS_CONN_UP) { 179 struct rds_ib_device *rds_ibdev; 180 struct rdma_dev_addr *dev_addr; 181 182 ic = conn->c_transport_data; 183 dev_addr = &ic->i_cm_id->route.addr.dev_addr; 184 185 ib_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid); 186 ib_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid); 187 188 rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client); 189 iinfo->max_send_wr = ic->i_send_ring.w_nr; 190 iinfo->max_recv_wr = ic->i_recv_ring.w_nr; 191 iinfo->max_send_sge = rds_ibdev->max_sge; 192 rds_ib_get_mr_info(rds_ibdev, iinfo); 193 } 194 return 1; 195 } 196 197 static void rds_ib_ic_info(struct socket *sock, unsigned int len, 198 struct rds_info_iterator *iter, 199 struct rds_info_lengths *lens) 200 { 201 rds_for_each_conn_info(sock, len, iter, lens, 202 rds_ib_conn_info_visitor, 203 sizeof(struct rds_info_rdma_connection)); 204 } 205 206 207 /* 208 * Early RDS/IB was built to only bind to an address if there is an IPoIB 209 * device with that address set. 210 * 211 * If it were me, I'd advocate for something more flexible. Sending and 212 * receiving should be device-agnostic. Transports would try and maintain 213 * connections between peers who have messages queued. Userspace would be 214 * allowed to influence which paths have priority. We could call userspace 215 * asserting this policy "routing". 216 */ 217 static int rds_ib_laddr_check(__be32 addr) 218 { 219 int ret; 220 struct rdma_cm_id *cm_id; 221 struct sockaddr_in sin; 222 223 /* Create a CMA ID and try to bind it. This catches both 224 * IB and iWARP capable NICs. 225 */ 226 cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP); 227 if (!cm_id) 228 return -EADDRNOTAVAIL; 229 230 memset(&sin, 0, sizeof(sin)); 231 sin.sin_family = AF_INET; 232 sin.sin_addr.s_addr = addr; 233 234 /* rdma_bind_addr will only succeed for IB & iWARP devices */ 235 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); 236 /* due to this, we will claim to support iWARP devices unless we 237 check node_type. */ 238 if (ret || cm_id->device->node_type != RDMA_NODE_IB_CA) 239 ret = -EADDRNOTAVAIL; 240 241 rdsdebug("addr %pI4 ret %d node type %d\n", 242 &addr, ret, 243 cm_id->device ? cm_id->device->node_type : -1); 244 245 rdma_destroy_id(cm_id); 246 247 return ret; 248 } 249 250 void rds_ib_exit(void) 251 { 252 rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info); 253 rds_ib_destroy_nodev_conns(); 254 ib_unregister_client(&rds_ib_client); 255 rds_ib_sysctl_exit(); 256 rds_ib_recv_exit(); 257 rds_trans_unregister(&rds_ib_transport); 258 } 259 260 struct rds_transport rds_ib_transport = { 261 .laddr_check = rds_ib_laddr_check, 262 .xmit_complete = rds_ib_xmit_complete, 263 .xmit = rds_ib_xmit, 264 .xmit_cong_map = NULL, 265 .xmit_rdma = rds_ib_xmit_rdma, 266 .recv = rds_ib_recv, 267 .conn_alloc = rds_ib_conn_alloc, 268 .conn_free = rds_ib_conn_free, 269 .conn_connect = rds_ib_conn_connect, 270 .conn_shutdown = rds_ib_conn_shutdown, 271 .inc_copy_to_user = rds_ib_inc_copy_to_user, 272 .inc_purge = rds_ib_inc_purge, 273 .inc_free = rds_ib_inc_free, 274 .cm_initiate_connect = rds_ib_cm_initiate_connect, 275 .cm_handle_connect = rds_ib_cm_handle_connect, 276 .cm_connect_complete = rds_ib_cm_connect_complete, 277 .stats_info_copy = rds_ib_stats_info_copy, 278 .exit = rds_ib_exit, 279 .get_mr = rds_ib_get_mr, 280 .sync_mr = rds_ib_sync_mr, 281 .free_mr = rds_ib_free_mr, 282 .flush_mrs = rds_ib_flush_mrs, 283 .t_owner = THIS_MODULE, 284 .t_name = "infiniband", 285 }; 286 287 int __init rds_ib_init(void) 288 { 289 int ret; 290 291 INIT_LIST_HEAD(&rds_ib_devices); 292 293 ret = ib_register_client(&rds_ib_client); 294 if (ret) 295 goto out; 296 297 ret = rds_ib_sysctl_init(); 298 if (ret) 299 goto out_ibreg; 300 301 ret = rds_ib_recv_init(); 302 if (ret) 303 goto out_sysctl; 304 305 ret = rds_trans_register(&rds_ib_transport); 306 if (ret) 307 goto out_recv; 308 309 rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info); 310 311 goto out; 312 313 out_recv: 314 rds_ib_recv_exit(); 315 out_sysctl: 316 rds_ib_sysctl_exit(); 317 out_ibreg: 318 ib_unregister_client(&rds_ib_client); 319 out: 320 return ret; 321 } 322 323 MODULE_LICENSE("GPL"); 324 325