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
  49 #include "ocrdma.h"
  50 #include "ocrdma_verbs.h"
  51 #include "ocrdma_ah.h"
  52 #include "ocrdma_hw.h"
  53 #include "ocrdma_stats.h"
  54
  55 #define OCRDMA_VID_PCP_SHIFT    0xD
  56
  57 static inline int set_av_attr(struct ocrdma_dev *dev, struct ocrdma_ah *ah,
  58                         struct ib_ah_attr *attr, union ib_gid *sgid,
  59                         int pdid, bool *isvlan)
  60 {
  61         int status = 0;
  62         u16 vlan_tag;
  63         struct ocrdma_eth_vlan eth;
  64         struct ocrdma_grh grh;
  65         int eth_sz;
  66
  67         memset(&eth, 0, sizeof(eth));
  68         memset(&grh, 0, sizeof(grh));
  69
  70         /* VLAN */
  71         vlan_tag = attr->vlan_id;
  72         if (!vlan_tag || (vlan_tag > 0xFFF))
  73                 vlan_tag = dev->pvid;
  74         if (vlan_tag || dev->pfc_state) {
  75                 if (!vlan_tag) {
  76                         pr_err("ocrdma%d:Using VLAN with PFC is recommended\n",
  77                                 dev->id);
  78                         pr_err("ocrdma%d:Using VLAN 0 for this connection\n",
  79                                 dev->id);
  80                 }
  81                 eth.eth_type = cpu_to_be16(0x8100);
  82                 eth.roce_eth_type = cpu_to_be16(OCRDMA_ROCE_ETH_TYPE);
  83                 vlan_tag |= (dev->sl & 0x07) << OCRDMA_VID_PCP_SHIFT;
  84                 eth.vlan_tag = cpu_to_be16(vlan_tag);
  85                 eth_sz = sizeof(struct ocrdma_eth_vlan);
  86                 *isvlan = true;
  87         } else {
  88                 eth.eth_type = cpu_to_be16(OCRDMA_ROCE_ETH_TYPE);
  89                 eth_sz = sizeof(struct ocrdma_eth_basic);
  90         }
  91         /* MAC */
  92         memcpy(&eth.smac[0], &dev->nic_info.mac_addr[0], ETH_ALEN);
  93         status = ocrdma_resolve_dmac(dev, attr, &eth.dmac[0]);
  94         if (status)
  95                 return status;
  96         ah->sgid_index = attr->grh.sgid_index;
  97         memcpy(&grh.sgid[0], sgid->raw, sizeof(union ib_gid));
  98         memcpy(&grh.dgid[0], attr->grh.dgid.raw, sizeof(attr->grh.dgid.raw));
  99
 100         grh.tclass_flow = cpu_to_be32((6 << 28) |
 101                         (attr->grh.traffic_class << 24) |
 102                         attr->grh.flow_label);
 103         /* 0x1b is next header value in GRH */
 104         grh.pdid_hoplimit = cpu_to_be32((pdid << 16) |
 105                         (0x1b << 8) | attr->grh.hop_limit);
 106         /* Eth HDR */
 107         memcpy(&ah->av->eth_hdr, &eth, eth_sz);
 108         memcpy((u8 *)ah->av + eth_sz, &grh, sizeof(struct ocrdma_grh));
 109         if (*isvlan)
 110                 ah->av->valid |= OCRDMA_AV_VLAN_VALID;
 111         ah->av->valid = cpu_to_le32(ah->av->valid);
 112         return status;
 113 }
 114
 115 struct ib_ah *ocrdma_create_ah(struct ib_pd *ibpd, struct ib_ah_attr *attr)
 116 {
 117         u32 *ahid_addr;
 118         bool isvlan = false;
 119         int status;
 120         struct ocrdma_ah *ah;
 121         struct ocrdma_pd *pd = get_ocrdma_pd(ibpd);
 122         struct ocrdma_dev *dev = get_ocrdma_dev(ibpd->device);
 123         union ib_gid sgid;
 124
 125         if (!(attr->ah_flags & IB_AH_GRH))
 126                 return ERR_PTR(-EINVAL);
 127
 128         if (atomic_cmpxchg(&dev->update_sl, 1, 0))
 129                 ocrdma_init_service_level(dev);
 130         ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
 131         if (!ah)
 132                 return ERR_PTR(-ENOMEM);
 133
 134         status = ocrdma_alloc_av(dev, ah);
 135         if (status)
 136                 goto av_err;
 137
 138         status = ocrdma_query_gid(&dev->ibdev, 1, attr->grh.sgid_index, &sgid);
 139         if (status) {
 140                 pr_err("%s(): Failed to query sgid, status = %d\n",
 141                       __func__, status);
 142                 goto av_conf_err;
 143         }
 144
 145         if ((pd->uctx) &&
 146             (!rdma_is_multicast_addr((struct in6_addr *)attr->grh.dgid.raw)) &&
 147             (!rdma_link_local_addr((struct in6_addr *)attr->grh.dgid.raw))) {
 148                 status = rdma_addr_find_dmac_by_grh(&sgid, &attr->grh.dgid,
 149                                         attr->dmac, &attr->vlan_id);
 150                 if (status) {
 151                         pr_err("%s(): Failed to resolve dmac from gid."
 152                                 "status = %d\n", __func__, status);
 153                         goto av_conf_err;
 154                 }
 155         }
 156
 157         status = set_av_attr(dev, ah, attr, &sgid, pd->id, &isvlan);
 158         if (status)
 159                 goto av_conf_err;
 160
 161         /* if pd is for the user process, pass the ah_id to user space */
 162         if ((pd->uctx) && (pd->uctx->ah_tbl.va)) {
 163                 ahid_addr = pd->uctx->ah_tbl.va + attr->dlid;
 164                 *ahid_addr = 0;
 165                 *ahid_addr |= ah->id & OCRDMA_AH_ID_MASK;
 166                 if (isvlan)
 167                         *ahid_addr |= (OCRDMA_AH_VLAN_VALID_MASK <<
 168                                        OCRDMA_AH_VLAN_VALID_SHIFT);
 169         }
 170
 171         return &ah->ibah;
 172
 173 av_conf_err:
 174         ocrdma_free_av(dev, ah);
 175 av_err:
 176         kfree(ah);
 177         return ERR_PTR(status);
 178 }
 179
 180 int ocrdma_destroy_ah(struct ib_ah *ibah)
 181 {
 182         struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
 183         struct ocrdma_dev *dev = get_ocrdma_dev(ibah->device);
 184
 185         ocrdma_free_av(dev, ah);
 186         kfree(ah);
 187         return 0;
 188 }
 189
 190 int ocrdma_query_ah(struct ib_ah *ibah, struct ib_ah_attr *attr)
 191 {
 192         struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
 193         struct ocrdma_av *av = ah->av;
 194         struct ocrdma_grh *grh;
 195         attr->ah_flags |= IB_AH_GRH;
 196         if (ah->av->valid & OCRDMA_AV_VALID) {
 197                 grh = (struct ocrdma_grh *)((u8 *)ah->av +
 198                                 sizeof(struct ocrdma_eth_vlan));
 199                 attr->sl = be16_to_cpu(av->eth_hdr.vlan_tag) >> 13;
 200         } else {
 201                 grh = (struct ocrdma_grh *)((u8 *)ah->av +
 202                                         sizeof(struct ocrdma_eth_basic));
 203                 attr->sl = 0;
 204         }
 205         memcpy(&attr->grh.dgid.raw[0], &grh->dgid[0], sizeof(grh->dgid));
 206         attr->grh.sgid_index = ah->sgid_index;
 207         attr->grh.hop_limit = be32_to_cpu(grh->pdid_hoplimit) & 0xff;
 208         attr->grh.traffic_class = be32_to_cpu(grh->tclass_flow) >> 24;
 209         attr->grh.flow_label = be32_to_cpu(grh->tclass_flow) & 0x00ffffffff;
 210         return 0;
 211 }
 212
 213 int ocrdma_modify_ah(struct ib_ah *ibah, struct ib_ah_attr *attr)
 214 {
 215         /* modify_ah is unsupported */
 216         return -ENOSYS;
 217 }
 218
 219 int ocrdma_process_mad(struct ib_device *ibdev,
 220                        int process_mad_flags,
 221                        u8 port_num,
 222                        const struct ib_wc *in_wc,
 223                        const struct ib_grh *in_grh,
 224                        const struct ib_mad_hdr *in, size_t in_mad_size,
 225                        struct ib_mad_hdr *out, size_t *out_mad_size,
 226                        u16 *out_mad_pkey_index)
 227 {
 228         int status;
 229         struct ocrdma_dev *dev;
 230         const struct ib_mad *in_mad = (const struct ib_mad *)in;
 231         struct ib_mad *out_mad = (struct ib_mad *)out;
 232
 233         if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) ||
 234                          *out_mad_size != sizeof(*out_mad)))
 235                 return IB_MAD_RESULT_FAILURE;
 236
 237         switch (in_mad->mad_hdr.mgmt_class) {
 238         case IB_MGMT_CLASS_PERF_MGMT:
 239                 dev = get_ocrdma_dev(ibdev);
 240                 if (!ocrdma_pma_counters(dev, out_mad))
 241                         status = IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 242                 else
 243                         status = IB_MAD_RESULT_SUCCESS;
 244                 break;
 245         default:
 246                 status = IB_MAD_RESULT_SUCCESS;
 247                 break;
 248         }
 249         return status;
 250 }