root/drivers/infiniband/hw/ocrdma/ocrdma_ah.c

DEFINITIONS

1. ocrdma_hdr_type_to_proto_num
2. set_av_attr
3. ocrdma_create_ah
4. ocrdma_destroy_ah
5. ocrdma_query_ah
6. ocrdma_process_mad

   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, const 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_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 == ETH_P_IBOE) ? 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         ib_grh = rdma_ah_read_grh(attr);
 124         ah->sgid_index = ib_grh->sgid_index;
 125         /* Eth HDR */
 126         memcpy(&ah->av->eth_hdr, &eth, eth_sz);
 127         if (ah->hdr_type == RDMA_NETWORK_IPV4) {
 128                 *((__be16 *)&ipv4) = htons((4 << 12) | (5 << 8) |
 129                                            ib_grh->traffic_class);
 130                 ipv4.id = cpu_to_be16(pdid);
 131                 ipv4.frag_off = htons(IP_DF);
 132                 ipv4.tot_len = htons(0);
 133                 ipv4.ttl = ib_grh->hop_limit;
 134                 ipv4.protocol = nxthdr;
 135                 rdma_gid2ip((struct sockaddr *)&sgid_addr, sgid);
 136                 ipv4.saddr = sgid_addr._sockaddr_in.sin_addr.s_addr;
 137                 rdma_gid2ip((struct sockaddr*)&dgid_addr, &ib_grh->dgid);
 138                 ipv4.daddr = dgid_addr._sockaddr_in.sin_addr.s_addr;
 139                 memcpy((u8 *)ah->av + eth_sz, &ipv4, sizeof(struct iphdr));
 140         } else {
 141                 memcpy(&grh.sgid[0], sgid->raw, sizeof(union ib_gid));
 142                 grh.tclass_flow = cpu_to_be32((6 << 28) |
 143                                               (ib_grh->traffic_class << 24) |
 144                                               ib_grh->flow_label);
 145                 memcpy(&grh.dgid[0], ib_grh->dgid.raw,
 146                        sizeof(ib_grh->dgid.raw));
 147                 grh.pdid_hoplimit = cpu_to_be32((pdid << 16) |
 148                                                 (nxthdr << 8) |
 149                                                 ib_grh->hop_limit);
 150                 memcpy((u8 *)ah->av + eth_sz, &grh, sizeof(struct ocrdma_grh));
 151         }
 152         if (*isvlan)
 153                 ah->av->valid |= OCRDMA_AV_VLAN_VALID;
 154         ah->av->valid = cpu_to_le32(ah->av->valid);
 155         return status;
 156 }
 157 
 158 int ocrdma_create_ah(struct ib_ah *ibah, struct rdma_ah_attr *attr, u32 flags,
 159                      struct ib_udata *udata)
 160 {
 161         u32 *ahid_addr;
 162         int status;
 163         struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
 164         bool isvlan = false;
 165         u16 vlan_tag = 0xffff;
 166         const struct ib_gid_attr *sgid_attr;
 167         struct ocrdma_pd *pd = get_ocrdma_pd(ibah->pd);
 168         struct ocrdma_dev *dev = get_ocrdma_dev(ibah->device);
 169 
 170         if ((attr->type != RDMA_AH_ATTR_TYPE_ROCE) ||
 171             !(rdma_ah_get_ah_flags(attr) & IB_AH_GRH))
 172                 return -EINVAL;
 173 
 174         if (atomic_cmpxchg(&dev->update_sl, 1, 0))
 175                 ocrdma_init_service_level(dev);
 176 
 177         sgid_attr = attr->grh.sgid_attr;
 178         status = rdma_read_gid_l2_fields(sgid_attr, &vlan_tag, NULL);
 179         if (status)
 180                 return status;
 181 
 182         status = ocrdma_alloc_av(dev, ah);
 183         if (status)
 184                 goto av_err;
 185 
 186         /* Get network header type for this GID */
 187         ah->hdr_type = rdma_gid_attr_network_type(sgid_attr);
 188 
 189         status = set_av_attr(dev, ah, attr, &sgid_attr->gid, pd->id,
 190                              &isvlan, vlan_tag);
 191         if (status)
 192                 goto av_conf_err;
 193 
 194         /* if pd is for the user process, pass the ah_id to user space */
 195         if ((pd->uctx) && (pd->uctx->ah_tbl.va)) {
 196                 ahid_addr = pd->uctx->ah_tbl.va + rdma_ah_get_dlid(attr);
 197                 *ahid_addr = 0;
 198                 *ahid_addr |= ah->id & OCRDMA_AH_ID_MASK;
 199                 if (ocrdma_is_udp_encap_supported(dev)) {
 200                         *ahid_addr |= ((u32)ah->hdr_type &
 201                                        OCRDMA_AH_L3_TYPE_MASK) <<
 202                                        OCRDMA_AH_L3_TYPE_SHIFT;
 203                 }
 204                 if (isvlan)
 205                         *ahid_addr |= (OCRDMA_AH_VLAN_VALID_MASK <<
 206                                        OCRDMA_AH_VLAN_VALID_SHIFT);
 207         }
 208 
 209         return 0;
 210 
 211 av_conf_err:
 212         ocrdma_free_av(dev, ah);
 213 av_err:
 214         return status;
 215 }
 216 
 217 void ocrdma_destroy_ah(struct ib_ah *ibah, u32 flags)
 218 {
 219         struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
 220         struct ocrdma_dev *dev = get_ocrdma_dev(ibah->device);
 221 
 222         ocrdma_free_av(dev, ah);
 223 }
 224 
 225 int ocrdma_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *attr)
 226 {
 227         struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
 228         struct ocrdma_av *av = ah->av;
 229         struct ocrdma_grh *grh;
 230 
 231         attr->type = ibah->type;
 232         if (ah->av->valid & OCRDMA_AV_VALID) {
 233                 grh = (struct ocrdma_grh *)((u8 *)ah->av +
 234                                 sizeof(struct ocrdma_eth_vlan));
 235                 rdma_ah_set_sl(attr, be16_to_cpu(av->eth_hdr.vlan_tag) >> 13);
 236         } else {
 237                 grh = (struct ocrdma_grh *)((u8 *)ah->av +
 238                                         sizeof(struct ocrdma_eth_basic));
 239                 rdma_ah_set_sl(attr, 0);
 240         }
 241         rdma_ah_set_grh(attr, NULL,
 242                         be32_to_cpu(grh->tclass_flow) & 0xffffffff,
 243                         ah->sgid_index,
 244                         be32_to_cpu(grh->pdid_hoplimit) & 0xff,
 245                         be32_to_cpu(grh->tclass_flow) >> 24);
 246         rdma_ah_set_dgid_raw(attr, &grh->dgid[0]);
 247         return 0;
 248 }
 249 
 250 int ocrdma_process_mad(struct ib_device *ibdev,
 251                        int process_mad_flags,
 252                        u8 port_num,
 253                        const struct ib_wc *in_wc,
 254                        const struct ib_grh *in_grh,
 255                        const struct ib_mad_hdr *in, size_t in_mad_size,
 256                        struct ib_mad_hdr *out, size_t *out_mad_size,
 257                        u16 *out_mad_pkey_index)
 258 {
 259         int status;
 260         struct ocrdma_dev *dev;
 261         const struct ib_mad *in_mad = (const struct ib_mad *)in;
 262         struct ib_mad *out_mad = (struct ib_mad *)out;
 263 
 264         if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) ||
 265                          *out_mad_size != sizeof(*out_mad)))
 266                 return IB_MAD_RESULT_FAILURE;
 267 
 268         switch (in_mad->mad_hdr.mgmt_class) {
 269         case IB_MGMT_CLASS_PERF_MGMT:
 270                 dev = get_ocrdma_dev(ibdev);
 271                 if (!ocrdma_pma_counters(dev, out_mad))
 272                         status = IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 273                 else
 274                         status = IB_MAD_RESULT_SUCCESS;
 275                 break;
 276         default:
 277                 status = IB_MAD_RESULT_SUCCESS;
 278                 break;
 279         }
 280         return status;
 281 }