net/rds/ib.c

   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 unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
  47
  48 module_param(fmr_pool_size, int, 0444);
  49 MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA");
  50 module_param(fmr_message_size, int, 0444);
  51 MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer");
  52 module_param(rds_ib_retry_count, int, 0444);
  53 MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
  54
  55 struct list_head rds_ib_devices;
  56
  57 /* NOTE: if also grabbing ibdev lock, grab this first */
  58 DEFINE_SPINLOCK(ib_nodev_conns_lock);
  59 LIST_HEAD(ib_nodev_conns);
  60
  61 void rds_ib_add_one(struct ib_device *device)
  62 {
  63         struct rds_ib_device *rds_ibdev;
  64         struct ib_device_attr *dev_attr;
  65
  66         /* Only handle IB (no iWARP) devices */
  67         if (device->node_type != RDMA_NODE_IB_CA)
  68                 return;
  69
  70         dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
  71         if (!dev_attr)
  72                 return;
  73
  74         if (ib_query_device(device, dev_attr)) {
  75                 rdsdebug("Query device failed for %s\n", device->name);
  76                 goto free_attr;
  77         }
  78
  79         rds_ibdev = kmalloc(sizeof *rds_ibdev, GFP_KERNEL);
  80         if (!rds_ibdev)
  81                 goto free_attr;
  82
  83         spin_lock_init(&rds_ibdev->spinlock);
  84
  85         rds_ibdev->max_wrs = dev_attr->max_qp_wr;
  86         rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE);
  87
  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                 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
 186                 rdma_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 (IS_ERR(cm_id))
 228                 return PTR_ERR(cm_id);
 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         .t_type                 = RDS_TRANS_IB
 286 };
 287
 288 int __init rds_ib_init(void)
 289 {
 290         int ret;
 291
 292         INIT_LIST_HEAD(&rds_ib_devices);
 293
 294         ret = ib_register_client(&rds_ib_client);
 295         if (ret)
 296                 goto out;
 297
 298         ret = rds_ib_sysctl_init();
 299         if (ret)
 300                 goto out_ibreg;
 301
 302         ret = rds_ib_recv_init();
 303         if (ret)
 304                 goto out_sysctl;
 305
 306         ret = rds_trans_register(&rds_ib_transport);
 307         if (ret)
 308                 goto out_recv;
 309
 310         rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
 311
 312         goto out;
 313
 314 out_recv:
 315         rds_ib_recv_exit();
 316 out_sysctl:
 317         rds_ib_sysctl_exit();
 318 out_ibreg:
 319         ib_unregister_client(&rds_ib_client);
 320 out:
 321         return ret;
 322 }
 323
 324 MODULE_LICENSE("GPL");
 325