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)ETH_P_IBOE;
  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 rdma_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         const struct ib_global_route *ib_grh;
  85         union {
  86                 struct sockaddr     _sockaddr;
  87                 struct sockaddr_in  _sockaddr_in;
  88                 struct sockaddr_in6 _sockaddr_in6;
  89         } sgid_addr, dgid_addr;
  90
  91         memset(&eth, 0, sizeof(eth));
  92         memset(&grh, 0, sizeof(grh));
  93
  94         /* Protocol Number */
  95         proto_num = ocrdma_hdr_type_to_proto_num(dev->id, ah->hdr_type);
  96         if (!proto_num)
  97                 return -EINVAL;
  98         nxthdr = (proto_num == ETH_P_IBOE) ? 0x1b : 0x11;
  99         /* VLAN */
 100         if (!vlan_tag || (vlan_tag > 0xFFF))
 101                 vlan_tag = dev->pvid;
 102         if (vlan_tag || dev->pfc_state) {
 103                 if (!vlan_tag) {
 104                         pr_err("ocrdma%d:Using VLAN with PFC is recommended\n",
 105                                 dev->id);
 106                         pr_err("ocrdma%d:Using VLAN 0 for this connection\n",
 107                                 dev->id);
 108                 }
 109                 eth.eth_type = cpu_to_be16(0x8100);
 110                 eth.roce_eth_type = cpu_to_be16(proto_num);
 111                 vlan_tag |= (dev->sl & 0x07) << OCRDMA_VID_PCP_SHIFT;
 112                 eth.vlan_tag = cpu_to_be16(vlan_tag);
 113                 eth_sz = sizeof(struct ocrdma_eth_vlan);
 114                 *isvlan = true;
 115         } else {
 116                 eth.eth_type = cpu_to_be16(proto_num);
 117                 eth_sz = sizeof(struct ocrdma_eth_basic);
 118         }
 119         /* MAC */
 120         memcpy(&eth.smac[0], &dev->nic_info.mac_addr[0], ETH_ALEN);
 121         status = ocrdma_resolve_dmac(dev, attr, &eth.dmac[0]);
 122         if (status)
 123                 return status;
 124         ib_grh = rdma_ah_read_grh(attr);
 125         ah->sgid_index = ib_grh->sgid_index;
 126         /* Eth HDR */
 127         memcpy(&ah->av->eth_hdr, &eth, eth_sz);
 128         if (ah->hdr_type == RDMA_NETWORK_IPV4) {
 129                 *((__be16 *)&ipv4) = htons((4 << 12) | (5 << 8) |
 130                                            ib_grh->traffic_class);
 131                 ipv4.id = cpu_to_be16(pdid);
 132                 ipv4.frag_off = htons(IP_DF);
 133                 ipv4.tot_len = htons(0);
 134                 ipv4.ttl = ib_grh->hop_limit;
 135                 ipv4.protocol = nxthdr;
 136                 rdma_gid2ip(&sgid_addr._sockaddr, sgid);
 137                 ipv4.saddr = sgid_addr._sockaddr_in.sin_addr.s_addr;
 138                 rdma_gid2ip(&dgid_addr._sockaddr, &ib_grh->dgid);
 139                 ipv4.daddr = dgid_addr._sockaddr_in.sin_addr.s_addr;
 140                 memcpy((u8 *)ah->av + eth_sz, &ipv4, sizeof(struct iphdr));
 141         } else {
 142                 memcpy(&grh.sgid[0], sgid->raw, sizeof(union ib_gid));
 143                 grh.tclass_flow = cpu_to_be32((6 << 28) |
 144                                               (ib_grh->traffic_class << 24) |
 145                                               ib_grh->flow_label);
 146                 memcpy(&grh.dgid[0], ib_grh->dgid.raw,
 147                        sizeof(ib_grh->dgid.raw));
 148                 grh.pdid_hoplimit = cpu_to_be32((pdid << 16) |
 149                                                 (nxthdr << 8) |
 150                                                 ib_grh->hop_limit);
 151                 memcpy((u8 *)ah->av + eth_sz, &grh, sizeof(struct ocrdma_grh));
 152         }
 153         if (*isvlan)
 154                 ah->av->valid |= OCRDMA_AV_VLAN_VALID;
 155         ah->av->valid = cpu_to_le32(ah->av->valid);
 156         return status;
 157 }
 158
 159 struct ib_ah *ocrdma_create_ah(struct ib_pd *ibpd, struct rdma_ah_attr *attr,
 160                                struct ib_udata *udata)
 161 {
 162         u32 *ahid_addr;
 163         int status;
 164         struct ocrdma_ah *ah;
 165         bool isvlan = false;
 166         u16 vlan_tag = 0xffff;
 167         struct ib_gid_attr sgid_attr;
 168         struct ocrdma_pd *pd = get_ocrdma_pd(ibpd);
 169         struct ocrdma_dev *dev = get_ocrdma_dev(ibpd->device);
 170         const struct ib_global_route *grh;
 171         union ib_gid sgid;
 172
 173         if ((attr->type != RDMA_AH_ATTR_TYPE_ROCE) ||
 174             !(rdma_ah_get_ah_flags(attr) & IB_AH_GRH))
 175                 return ERR_PTR(-EINVAL);
 176
 177         grh = rdma_ah_read_grh(attr);
 178         if (atomic_cmpxchg(&dev->update_sl, 1, 0))
 179                 ocrdma_init_service_level(dev);
 180
 181         ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
 182         if (!ah)
 183                 return ERR_PTR(-ENOMEM);
 184
 185         status = ocrdma_alloc_av(dev, ah);
 186         if (status)
 187                 goto av_err;
 188
 189         status = ib_get_cached_gid(&dev->ibdev, 1, grh->sgid_index, &sgid,
 190                                    &sgid_attr);
 191         if (status) {
 192                 pr_err("%s(): Failed to query sgid, status = %d\n",
 193                       __func__, status);
 194                 goto av_conf_err;
 195         }
 196         if (sgid_attr.ndev) {
 197                 if (is_vlan_dev(sgid_attr.ndev))
 198                         vlan_tag = vlan_dev_vlan_id(sgid_attr.ndev);
 199                 dev_put(sgid_attr.ndev);
 200         }
 201         /* Get network header type for this GID */
 202         ah->hdr_type = ib_gid_to_network_type(sgid_attr.gid_type, &sgid);
 203
 204         status = set_av_attr(dev, ah, attr, &sgid, pd->id, &isvlan, vlan_tag);
 205         if (status)
 206                 goto av_conf_err;
 207
 208         /* if pd is for the user process, pass the ah_id to user space */
 209         if ((pd->uctx) && (pd->uctx->ah_tbl.va)) {
 210                 ahid_addr = pd->uctx->ah_tbl.va + rdma_ah_get_dlid(attr);
 211                 *ahid_addr = 0;
 212                 *ahid_addr |= ah->id & OCRDMA_AH_ID_MASK;
 213                 if (ocrdma_is_udp_encap_supported(dev)) {
 214                         *ahid_addr |= ((u32)ah->hdr_type &
 215                                        OCRDMA_AH_L3_TYPE_MASK) <<
 216                                        OCRDMA_AH_L3_TYPE_SHIFT;
 217                 }
 218                 if (isvlan)
 219                         *ahid_addr |= (OCRDMA_AH_VLAN_VALID_MASK <<
 220                                        OCRDMA_AH_VLAN_VALID_SHIFT);
 221         }
 222
 223         return &ah->ibah;
 224
 225 av_conf_err:
 226         ocrdma_free_av(dev, ah);
 227 av_err:
 228         kfree(ah);
 229         return ERR_PTR(status);
 230 }
 231
 232 int ocrdma_destroy_ah(struct ib_ah *ibah)
 233 {
 234         struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
 235         struct ocrdma_dev *dev = get_ocrdma_dev(ibah->device);
 236
 237         ocrdma_free_av(dev, ah);
 238         kfree(ah);
 239         return 0;
 240 }
 241
 242 int ocrdma_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *attr)
 243 {
 244         struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
 245         struct ocrdma_av *av = ah->av;
 246         struct ocrdma_grh *grh;
 247
 248         attr->type = ibah->type;
 249         if (ah->av->valid & OCRDMA_AV_VALID) {
 250                 grh = (struct ocrdma_grh *)((u8 *)ah->av +
 251                                 sizeof(struct ocrdma_eth_vlan));
 252                 rdma_ah_set_sl(attr, be16_to_cpu(av->eth_hdr.vlan_tag) >> 13);
 253         } else {
 254                 grh = (struct ocrdma_grh *)((u8 *)ah->av +
 255                                         sizeof(struct ocrdma_eth_basic));
 256                 rdma_ah_set_sl(attr, 0);
 257         }
 258         rdma_ah_set_grh(attr, NULL,
 259                         be32_to_cpu(grh->tclass_flow) & 0xffffffff,
 260                         ah->sgid_index,
 261                         be32_to_cpu(grh->pdid_hoplimit) & 0xff,
 262                         be32_to_cpu(grh->tclass_flow) >> 24);
 263         rdma_ah_set_dgid_raw(attr, &grh->dgid[0]);
 264         return 0;
 265 }
 266
 267 int ocrdma_modify_ah(struct ib_ah *ibah, struct rdma_ah_attr *attr)
 268 {
 269         /* modify_ah is unsupported */
 270         return -ENOSYS;
 271 }
 272
 273 int ocrdma_process_mad(struct ib_device *ibdev,
 274                        int process_mad_flags,
 275                        u8 port_num,
 276                        const struct ib_wc *in_wc,
 277                        const struct ib_grh *in_grh,
 278                        const struct ib_mad_hdr *in, size_t in_mad_size,
 279                        struct ib_mad_hdr *out, size_t *out_mad_size,
 280                        u16 *out_mad_pkey_index)
 281 {
 282         int status;
 283         struct ocrdma_dev *dev;
 284         const struct ib_mad *in_mad = (const struct ib_mad *)in;
 285         struct ib_mad *out_mad = (struct ib_mad *)out;
 286
 287         if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) ||
 288                          *out_mad_size != sizeof(*out_mad)))
 289                 return IB_MAD_RESULT_FAILURE;
 290
 291         switch (in_mad->mad_hdr.mgmt_class) {
 292         case IB_MGMT_CLASS_PERF_MGMT:
 293                 dev = get_ocrdma_dev(ibdev);
 294                 if (!ocrdma_pma_counters(dev, out_mad))
 295                         status = IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 296                 else
 297                         status = IB_MAD_RESULT_SUCCESS;
 298                 break;
 299         default:
 300                 status = IB_MAD_RESULT_SUCCESS;
 301                 break;
 302         }
 303         return status;
 304 }