net/rds/iw.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 "iw.h"
  43
  44 unsigned int fastreg_pool_size = RDS_FASTREG_POOL_SIZE;
  45 unsigned int fastreg_message_size = RDS_FASTREG_SIZE + 1; /* +1 allows for unaligned MRs */
  46
  47 module_param(fastreg_pool_size, int, 0444);
  48 MODULE_PARM_DESC(fastreg_pool_size, " Max number of fastreg MRs per device");
  49 module_param(fastreg_message_size, int, 0444);
  50 MODULE_PARM_DESC(fastreg_message_size, " Max size of a RDMA transfer (fastreg MRs)");
  51
  52 struct list_head rds_iw_devices;
  53
  54 /* NOTE: if also grabbing iwdev lock, grab this first */
  55 DEFINE_SPINLOCK(iw_nodev_conns_lock);
  56 LIST_HEAD(iw_nodev_conns);
  57
  58 void rds_iw_add_one(struct ib_device *device)
  59 {
  60         struct rds_iw_device *rds_iwdev;
  61         struct ib_device_attr *dev_attr;
  62
  63         /* Only handle iwarp devices */
  64         if (device->node_type != RDMA_NODE_RNIC)
  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_iwdev = kmalloc(sizeof *rds_iwdev, GFP_KERNEL);
  77         if (!rds_iwdev)
  78                 goto free_attr;
  79
  80         spin_lock_init(&rds_iwdev->spinlock);
  81
  82         rds_iwdev->dma_local_lkey = !!(dev_attr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY);
  83         rds_iwdev->max_wrs = dev_attr->max_qp_wr;
  84         rds_iwdev->max_sge = min(dev_attr->max_sge, RDS_IW_MAX_SGE);
  85
  86         rds_iwdev->page_shift = max(PAGE_SHIFT, ffs(dev_attr->page_size_cap) - 1);
  87
  88         rds_iwdev->dev = device;
  89         rds_iwdev->pd = ib_alloc_pd(device);
  90         if (IS_ERR(rds_iwdev->pd))
  91                 goto free_dev;
  92
  93         if (!rds_iwdev->dma_local_lkey) {
  94                 if (device->node_type != RDMA_NODE_RNIC) {
  95                         rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd,
  96                                                 IB_ACCESS_LOCAL_WRITE);
  97                 } else {
  98                         rds_iwdev->mr = ib_get_dma_mr(rds_iwdev->pd,
  99                                                 IB_ACCESS_REMOTE_READ |
 100                                                 IB_ACCESS_REMOTE_WRITE |
 101                                                 IB_ACCESS_LOCAL_WRITE);
 102                 }
 103                 if (IS_ERR(rds_iwdev->mr))
 104                         goto err_pd;
 105         } else
 106                 rds_iwdev->mr = NULL;
 107
 108         rds_iwdev->mr_pool = rds_iw_create_mr_pool(rds_iwdev);
 109         if (IS_ERR(rds_iwdev->mr_pool)) {
 110                 rds_iwdev->mr_pool = NULL;
 111                 goto err_mr;
 112         }
 113
 114         INIT_LIST_HEAD(&rds_iwdev->cm_id_list);
 115         INIT_LIST_HEAD(&rds_iwdev->conn_list);
 116         list_add_tail(&rds_iwdev->list, &rds_iw_devices);
 117
 118         ib_set_client_data(device, &rds_iw_client, rds_iwdev);
 119
 120         goto free_attr;
 121
 122 err_mr:
 123         if (rds_iwdev->mr)
 124                 ib_dereg_mr(rds_iwdev->mr);
 125 err_pd:
 126         ib_dealloc_pd(rds_iwdev->pd);
 127 free_dev:
 128         kfree(rds_iwdev);
 129 free_attr:
 130         kfree(dev_attr);
 131 }
 132
 133 void rds_iw_remove_one(struct ib_device *device)
 134 {
 135         struct rds_iw_device *rds_iwdev;
 136         struct rds_iw_cm_id *i_cm_id, *next;
 137
 138         rds_iwdev = ib_get_client_data(device, &rds_iw_client);
 139         if (!rds_iwdev)
 140                 return;
 141
 142         spin_lock_irq(&rds_iwdev->spinlock);
 143         list_for_each_entry_safe(i_cm_id, next, &rds_iwdev->cm_id_list, list) {
 144                 list_del(&i_cm_id->list);
 145                 kfree(i_cm_id);
 146         }
 147         spin_unlock_irq(&rds_iwdev->spinlock);
 148
 149         rds_iw_destroy_conns(rds_iwdev);
 150
 151         if (rds_iwdev->mr_pool)
 152                 rds_iw_destroy_mr_pool(rds_iwdev->mr_pool);
 153
 154         if (rds_iwdev->mr)
 155                 ib_dereg_mr(rds_iwdev->mr);
 156
 157         while (ib_dealloc_pd(rds_iwdev->pd)) {
 158                 rdsdebug("Failed to dealloc pd %p\n", rds_iwdev->pd);
 159                 msleep(1);
 160         }
 161
 162         list_del(&rds_iwdev->list);
 163         kfree(rds_iwdev);
 164 }
 165
 166 struct ib_client rds_iw_client = {
 167         .name   = "rds_iw",
 168         .add    = rds_iw_add_one,
 169         .remove = rds_iw_remove_one
 170 };
 171
 172 static int rds_iw_conn_info_visitor(struct rds_connection *conn,
 173                                     void *buffer)
 174 {
 175         struct rds_info_rdma_connection *iinfo = buffer;
 176         struct rds_iw_connection *ic;
 177
 178         /* We will only ever look at IB transports */
 179         if (conn->c_trans != &rds_iw_transport)
 180                 return 0;
 181
 182         iinfo->src_addr = conn->c_laddr;
 183         iinfo->dst_addr = conn->c_faddr;
 184
 185         memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
 186         memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
 187         if (rds_conn_state(conn) == RDS_CONN_UP) {
 188                 struct rds_iw_device *rds_iwdev;
 189                 struct rdma_dev_addr *dev_addr;
 190
 191                 ic = conn->c_transport_data;
 192                 dev_addr = &ic->i_cm_id->route.addr.dev_addr;
 193
 194                 ib_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
 195                 ib_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
 196
 197                 rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
 198                 iinfo->max_send_wr = ic->i_send_ring.w_nr;
 199                 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
 200                 iinfo->max_send_sge = rds_iwdev->max_sge;
 201                 rds_iw_get_mr_info(rds_iwdev, iinfo);
 202         }
 203         return 1;
 204 }
 205
 206 static void rds_iw_ic_info(struct socket *sock, unsigned int len,
 207                            struct rds_info_iterator *iter,
 208                            struct rds_info_lengths *lens)
 209 {
 210         rds_for_each_conn_info(sock, len, iter, lens,
 211                                 rds_iw_conn_info_visitor,
 212                                 sizeof(struct rds_info_rdma_connection));
 213 }
 214
 215
 216 /*
 217  * Early RDS/IB was built to only bind to an address if there is an IPoIB
 218  * device with that address set.
 219  *
 220  * If it were me, I'd advocate for something more flexible.  Sending and
 221  * receiving should be device-agnostic.  Transports would try and maintain
 222  * connections between peers who have messages queued.  Userspace would be
 223  * allowed to influence which paths have priority.  We could call userspace
 224  * asserting this policy "routing".
 225  */
 226 static int rds_iw_laddr_check(__be32 addr)
 227 {
 228         int ret;
 229         struct rdma_cm_id *cm_id;
 230         struct sockaddr_in sin;
 231
 232         /* Create a CMA ID and try to bind it. This catches both
 233          * IB and iWARP capable NICs.
 234          */
 235         cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP);
 236         if (IS_ERR(cm_id))
 237                 return PTR_ERR(cm_id);
 238
 239         memset(&sin, 0, sizeof(sin));
 240         sin.sin_family = AF_INET;
 241         sin.sin_addr.s_addr = addr;
 242
 243         /* rdma_bind_addr will only succeed for IB & iWARP devices */
 244         ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
 245         /* due to this, we will claim to support IB devices unless we
 246            check node_type. */
 247         if (ret || cm_id->device->node_type != RDMA_NODE_RNIC)
 248                 ret = -EADDRNOTAVAIL;
 249
 250         rdsdebug("addr %pI4 ret %d node type %d\n",
 251                 &addr, ret,
 252                 cm_id->device ? cm_id->device->node_type : -1);
 253
 254         rdma_destroy_id(cm_id);
 255
 256         return ret;
 257 }
 258
 259 void rds_iw_exit(void)
 260 {
 261         rds_info_deregister_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
 262         rds_iw_destroy_nodev_conns();
 263         ib_unregister_client(&rds_iw_client);
 264         rds_iw_sysctl_exit();
 265         rds_iw_recv_exit();
 266         rds_trans_unregister(&rds_iw_transport);
 267 }
 268
 269 struct rds_transport rds_iw_transport = {
 270         .laddr_check            = rds_iw_laddr_check,
 271         .xmit_complete          = rds_iw_xmit_complete,
 272         .xmit                   = rds_iw_xmit,
 273         .xmit_cong_map          = NULL,
 274         .xmit_rdma              = rds_iw_xmit_rdma,
 275         .recv                   = rds_iw_recv,
 276         .conn_alloc             = rds_iw_conn_alloc,
 277         .conn_free              = rds_iw_conn_free,
 278         .conn_connect           = rds_iw_conn_connect,
 279         .conn_shutdown          = rds_iw_conn_shutdown,
 280         .inc_copy_to_user       = rds_iw_inc_copy_to_user,
 281         .inc_purge              = rds_iw_inc_purge,
 282         .inc_free               = rds_iw_inc_free,
 283         .cm_initiate_connect    = rds_iw_cm_initiate_connect,
 284         .cm_handle_connect      = rds_iw_cm_handle_connect,
 285         .cm_connect_complete    = rds_iw_cm_connect_complete,
 286         .stats_info_copy        = rds_iw_stats_info_copy,
 287         .exit                   = rds_iw_exit,
 288         .get_mr                 = rds_iw_get_mr,
 289         .sync_mr                = rds_iw_sync_mr,
 290         .free_mr                = rds_iw_free_mr,
 291         .flush_mrs              = rds_iw_flush_mrs,
 292         .t_owner                = THIS_MODULE,
 293         .t_name                 = "iwarp",
 294         .t_prefer_loopback      = 1,
 295 };
 296
 297 int __init rds_iw_init(void)
 298 {
 299         int ret;
 300
 301         INIT_LIST_HEAD(&rds_iw_devices);
 302
 303         ret = ib_register_client(&rds_iw_client);
 304         if (ret)
 305                 goto out;
 306
 307         ret = rds_iw_sysctl_init();
 308         if (ret)
 309                 goto out_ibreg;
 310
 311         ret = rds_iw_recv_init();
 312         if (ret)
 313                 goto out_sysctl;
 314
 315         ret = rds_trans_register(&rds_iw_transport);
 316         if (ret)
 317                 goto out_recv;
 318
 319         rds_info_register_func(RDS_INFO_IWARP_CONNECTIONS, rds_iw_ic_info);
 320
 321         goto out;
 322
 323 out_recv:
 324         rds_iw_recv_exit();
 325 out_sysctl:
 326         rds_iw_sysctl_exit();
 327 out_ibreg:
 328         ib_unregister_client(&rds_iw_client);
 329 out:
 330         return ret;
 331 }
 332
 333 MODULE_LICENSE("GPL");
 334