drivers/infiniband/hw/ocrdma/ocrdma_ah.c

   1 /* This file is part of the Emulex RoCE Device Driver for
   2  * RoCE (RDMA over Converged Ethernet) adapters.
   3  * Copyright (C) 2012-2015 Emulex. All rights reserved.
   4  * EMULEX and SLI are trademarks of Emulex.
   5  * www.emulex.com
   6  *
   7  * This software is available to you under a choice of one of two licenses.
   8  * You may choose to be licensed under the terms of the GNU General Public
   9  * License (GPL) Version 2, available from the file COPYING in the main
  10  * directory of this source tree, or the BSD license below:
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  *
  16  * - Redistributions of source code must retain the above copyright notice,
  17  *   this list of conditions and the following disclaimer.
  18  *
  19  * - Redistributions in binary form must reproduce the above copyright
  20  *   notice, this list of conditions and the following disclaimer in
  21  *   the documentation and/or other materials provided with the distribution.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  24  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  27  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  31  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  32  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  33  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * Contact Information:
  36  * linux-drivers@emulex.com
  37  *
  38  * Emulex
  39  * 3333 Susan Street
  40  * Costa Mesa, CA 92626
  41  */
  42
  43 #include <net/neighbour.h>
  44 #include <net/netevent.h>
  45
  46 #include <rdma/ib_addr.h>
  47 #include <rdma/ib_mad.h>
  48 #include <rdma/ib_cache.h>
  49
  50 #include "ocrdma.h"
  51 #include "ocrdma_verbs.h"
  52 #include "ocrdma_ah.h"
  53 #include "ocrdma_hw.h"
  54 #include "ocrdma_stats.h"
  55
  56 #define OCRDMA_VID_PCP_SHIFT    0xD
  57
  58 static u16 ocrdma_hdr_type_to_proto_num(int devid, u8 hdr_type)
  59 {
  60         switch (hdr_type) {
  61         case OCRDMA_L3_TYPE_IB_GRH:
  62                 return (u16)0x8915;
  63         case OCRDMA_L3_TYPE_IPV4:
  64                 return (u16)0x0800;
  65         case OCRDMA_L3_TYPE_IPV6:
  66                 return (u16)0x86dd;
  67         default:
  68                 pr_err("ocrdma%d: Invalid network header\n", devid);
  69                 return 0;
  70         }
  71 }
  72
  73 static inline int set_av_attr(struct ocrdma_dev *dev, struct ocrdma_ah *ah,
  74                         struct ib_ah_attr *attr, union ib_gid *sgid,
  75                         int pdid, bool *isvlan, u16 vlan_tag)
  76 {
  77         int status;
  78         struct ocrdma_eth_vlan eth;
  79         struct ocrdma_grh grh;
  80         int eth_sz;
  81         u16 proto_num = 0;
  82         u8 nxthdr = 0x11;
  83         struct iphdr ipv4;
  84         union {
  85                 struct sockaddr     _sockaddr;
  86                 struct sockaddr_in  _sockaddr_in;
  87                 struct sockaddr_in6 _sockaddr_in6;
  88         } sgid_addr, dgid_addr;
  89
  90         memset(&eth, 0, sizeof(eth));
  91         memset(&grh, 0, sizeof(grh));
  92
  93         /* Protocol Number */
  94         proto_num = ocrdma_hdr_type_to_proto_num(dev->id, ah->hdr_type);
  95         if (!proto_num)
  96                 return -EINVAL;
  97         nxthdr = (proto_num == 0x8915) ? 0x1b : 0x11;
  98         /* VLAN */
  99         if (!vlan_tag || (vlan_tag > 0xFFF))
 100                 vlan_tag = dev->pvid;
 101         if (vlan_tag || dev->pfc_state) {
 102                 if (!vlan_tag) {
 103                         pr_err("ocrdma%d:Using VLAN with PFC is recommended\n",
 104                                 dev->id);
 105                         pr_err("ocrdma%d:Using VLAN 0 for this connection\n",
 106                                 dev->id);
 107                 }
 108                 eth.eth_type = cpu_to_be16(0x8100);
 109                 eth.roce_eth_type = cpu_to_be16(proto_num);
 110                 vlan_tag |= (dev->sl & 0x07) << OCRDMA_VID_PCP_SHIFT;
 111                 eth.vlan_tag = cpu_to_be16(vlan_tag);
 112                 eth_sz = sizeof(struct ocrdma_eth_vlan);
 113                 *isvlan = true;
 114         } else {
 115                 eth.eth_type = cpu_to_be16(proto_num);
 116                 eth_sz = sizeof(struct ocrdma_eth_basic);
 117         }
 118         /* MAC */
 119         memcpy(&eth.smac[0], &dev->nic_info.mac_addr[0], ETH_ALEN);
 120         status = ocrdma_resolve_dmac(dev, attr, &eth.dmac[0]);
 121         if (status)
 122                 return status;
 123         ah->sgid_index = attr->grh.sgid_index;
 124         /* Eth HDR */
 125         memcpy(&ah->av->eth_hdr, &eth, eth_sz);
 126         if (ah->hdr_type == RDMA_NETWORK_IPV4) {
 127                 *((__be16 *)&ipv4) = htons((4 << 12) | (5 << 8) |
 128                                            attr->grh.traffic_class);
 129                 ipv4.id = cpu_to_be16(pdid);
 130                 ipv4.frag_off = htons(IP_DF);
 131                 ipv4.tot_len = htons(0);
 132                 ipv4.ttl = attr->grh.hop_limit;
 133                 ipv4.protocol = nxthdr;
 134                 rdma_gid2ip(&sgid_addr._sockaddr, sgid);
 135                 ipv4.saddr = sgid_addr._sockaddr_in.sin_addr.s_addr;
 136                 rdma_gid2ip(&dgid_addr._sockaddr, &attr->grh.dgid);
 137                 ipv4.daddr = dgid_addr._sockaddr_in.sin_addr.s_addr;
 138                 memcpy((u8 *)ah->av + eth_sz, &ipv4, sizeof(struct iphdr));
 139         } else {
 140                 memcpy(&grh.sgid[0], sgid->raw, sizeof(union ib_gid));
 141                 grh.tclass_flow = cpu_to_be32((6 << 28) |
 142                                               (attr->grh.traffic_class << 24) |
 143                                               attr->grh.flow_label);
 144                 memcpy(&grh.dgid[0], attr->grh.dgid.raw,
 145                        sizeof(attr->grh.dgid.raw));
 146                 grh.pdid_hoplimit = cpu_to_be32((pdid << 16) |
 147                                                 (nxthdr << 8) |
 148                                                 attr->grh.hop_limit);
 149                 memcpy((u8 *)ah->av + eth_sz, &grh, sizeof(struct ocrdma_grh));
 150         }
 151         if (*isvlan)
 152                 ah->av->valid |= OCRDMA_AV_VLAN_VALID;
 153         ah->av->valid = cpu_to_le32(ah->av->valid);
 154         return status;
 155 }
 156
 157 struct ib_ah *ocrdma_create_ah(struct ib_pd *ibpd, struct ib_ah_attr *attr)
 158 {
 159         u32 *ahid_addr;
 160         int status;
 161         struct ocrdma_ah *ah;
 162         bool isvlan = false;
 163         u16 vlan_tag = 0xffff;
 164         struct ib_gid_attr sgid_attr;
 165         struct ocrdma_pd *pd = get_ocrdma_pd(ibpd);
 166         struct ocrdma_dev *dev = get_ocrdma_dev(ibpd->device);
 167         union ib_gid sgid;
 168
 169         if (!(attr->ah_flags & IB_AH_GRH))
 170                 return ERR_PTR(-EINVAL);
 171
 172         if (atomic_cmpxchg(&dev->update_sl, 1, 0))
 173                 ocrdma_init_service_level(dev);
 174
 175         ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
 176         if (!ah)
 177                 return ERR_PTR(-ENOMEM);
 178
 179         status = ocrdma_alloc_av(dev, ah);
 180         if (status)
 181                 goto av_err;
 182
 183         status = ib_get_cached_gid(&dev->ibdev, 1, attr->grh.sgid_index, &sgid,
 184                                    &sgid_attr);
 185         if (status) {
 186                 pr_err("%s(): Failed to query sgid, status = %d\n",
 187                       __func__, status);
 188                 goto av_conf_err;
 189         }
 190         if (sgid_attr.ndev) {
 191                 if (is_vlan_dev(sgid_attr.ndev))
 192                         vlan_tag = vlan_dev_vlan_id(sgid_attr.ndev);
 193                 dev_put(sgid_attr.ndev);
 194         }
 195         /* Get network header type for this GID */
 196         ah->hdr_type = ib_gid_to_network_type(sgid_attr.gid_type, &sgid);
 197
 198         if ((pd->uctx) &&
 199             (!rdma_is_multicast_addr((struct in6_addr *)attr->grh.dgid.raw)) &&
 200             (!rdma_link_local_addr((struct in6_addr *)attr->grh.dgid.raw))) {
 201                 status = rdma_addr_find_l2_eth_by_grh(&sgid, &attr->grh.dgid,
 202                                                       attr->dmac, &vlan_tag,
 203                                                       &sgid_attr.ndev->ifindex,
 204                                                       NULL);
 205                 if (status) {
 206                         pr_err("%s(): Failed to resolve dmac from gid."
 207                                 "status = %d\n", __func__, status);
 208                         goto av_conf_err;
 209                 }
 210         }
 211
 212         status = set_av_attr(dev, ah, attr, &sgid, pd->id, &isvlan, vlan_tag);
 213         if (status)
 214                 goto av_conf_err;
 215
 216         /* if pd is for the user process, pass the ah_id to user space */
 217         if ((pd->uctx) && (pd->uctx->ah_tbl.va)) {
 218                 ahid_addr = pd->uctx->ah_tbl.va + attr->dlid;
 219                 *ahid_addr = 0;
 220                 *ahid_addr |= ah->id & OCRDMA_AH_ID_MASK;
 221                 if (ocrdma_is_udp_encap_supported(dev)) {
 222                         *ahid_addr |= ((u32)ah->hdr_type &
 223                                        OCRDMA_AH_L3_TYPE_MASK) <<
 224                                        OCRDMA_AH_L3_TYPE_SHIFT;
 225                 }
 226                 if (isvlan)
 227                         *ahid_addr |= (OCRDMA_AH_VLAN_VALID_MASK <<
 228                                        OCRDMA_AH_VLAN_VALID_SHIFT);
 229         }
 230
 231         return &ah->ibah;
 232
 233 av_conf_err:
 234         ocrdma_free_av(dev, ah);
 235 av_err:
 236         kfree(ah);
 237         return ERR_PTR(status);
 238 }
 239
 240 int ocrdma_destroy_ah(struct ib_ah *ibah)
 241 {
 242         struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
 243         struct ocrdma_dev *dev = get_ocrdma_dev(ibah->device);
 244
 245         ocrdma_free_av(dev, ah);
 246         kfree(ah);
 247         return 0;
 248 }
 249
 250 int ocrdma_query_ah(struct ib_ah *ibah, struct ib_ah_attr *attr)
 251 {
 252         struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
 253         struct ocrdma_av *av = ah->av;
 254         struct ocrdma_grh *grh;
 255         attr->ah_flags |= IB_AH_GRH;
 256         if (ah->av->valid & OCRDMA_AV_VALID) {
 257                 grh = (struct ocrdma_grh *)((u8 *)ah->av +
 258                                 sizeof(struct ocrdma_eth_vlan));
 259                 attr->sl = be16_to_cpu(av->eth_hdr.vlan_tag) >> 13;
 260         } else {
 261                 grh = (struct ocrdma_grh *)((u8 *)ah->av +
 262                                         sizeof(struct ocrdma_eth_basic));
 263                 attr->sl = 0;
 264         }
 265         memcpy(&attr->grh.dgid.raw[0], &grh->dgid[0], sizeof(grh->dgid));
 266         attr->grh.sgid_index = ah->sgid_index;
 267         attr->grh.hop_limit = be32_to_cpu(grh->pdid_hoplimit) & 0xff;
 268         attr->grh.traffic_class = be32_to_cpu(grh->tclass_flow) >> 24;
 269         attr->grh.flow_label = be32_to_cpu(grh->tclass_flow) & 0x00ffffffff;
 270         return 0;
 271 }
 272
 273 int ocrdma_modify_ah(struct ib_ah *ibah, struct ib_ah_attr *attr)
 274 {
 275         /* modify_ah is unsupported */
 276         return -ENOSYS;
 277 }
 278
 279 int ocrdma_process_mad(struct ib_device *ibdev,
 280                        int process_mad_flags,
 281                        u8 port_num,
 282                        const struct ib_wc *in_wc,
 283                        const struct ib_grh *in_grh,
 284                        const struct ib_mad_hdr *in, size_t in_mad_size,
 285                        struct ib_mad_hdr *out, size_t *out_mad_size,
 286                        u16 *out_mad_pkey_index)
 287 {
 288         int status;
 289         struct ocrdma_dev *dev;
 290         const struct ib_mad *in_mad = (const struct ib_mad *)in;
 291         struct ib_mad *out_mad = (struct ib_mad *)out;
 292
 293         if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) ||
 294                          *out_mad_size != sizeof(*out_mad)))
 295                 return IB_MAD_RESULT_FAILURE;
 296
 297         switch (in_mad->mad_hdr.mgmt_class) {
 298         case IB_MGMT_CLASS_PERF_MGMT:
 299                 dev = get_ocrdma_dev(ibdev);
 300                 if (!ocrdma_pma_counters(dev, out_mad))
 301                         status = IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 302                 else
 303                         status = IB_MAD_RESULT_SUCCESS;
 304                 break;
 305         default:
 306                 status = IB_MAD_RESULT_SUCCESS;
 307                 break;
 308         }
 309         return status;
 310 }