drivers/infiniband/hw/ocrdma/ocrdma_ah.c

   1 /*******************************************************************
   2  * This file is part of the Emulex RoCE Device Driver for          *
   3  * RoCE (RDMA over Converged Ethernet) adapters.                   *
   4  * Copyright (C) 2008-2012 Emulex. All rights reserved.            *
   5  * EMULEX and SLI are trademarks of Emulex.                        *
   6  * www.emulex.com                                                  *
   7  *                                                                 *
   8  * This program is free software; you can redistribute it and/or   *
   9  * modify it under the terms of version 2 of the GNU General       *
  10  * Public License as published by the Free Software Foundation.    *
  11  * This program is distributed in the hope that it will be useful. *
  12  * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
  13  * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
  14  * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
  15  * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
  16  * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
  17  * more details, a copy of which can be found in the file COPYING  *
  18  * included with this package.                                     *
  19  *
  20  * Contact Information:
  21  * linux-drivers@emulex.com
  22  *
  23  * Emulex
  24  * 3333 Susan Street
  25  * Costa Mesa, CA 92626
  26  *******************************************************************/
  27
  28 #include <net/neighbour.h>
  29 #include <net/netevent.h>
  30
  31 #include <rdma/ib_addr.h>
  32 #include <rdma/ib_cache.h>
  33
  34 #include "ocrdma.h"
  35 #include "ocrdma_verbs.h"
  36 #include "ocrdma_ah.h"
  37 #include "ocrdma_hw.h"
  38
  39 static inline int set_av_attr(struct ocrdma_ah *ah,
  40                                 struct ib_ah_attr *attr, int pdid)
  41 {
  42         int status = 0;
  43         u16 vlan_tag; bool vlan_enabled = false;
  44         struct ocrdma_dev *dev = ah->dev;
  45         struct ocrdma_eth_vlan eth;
  46         struct ocrdma_grh grh;
  47         int eth_sz;
  48
  49         memset(&eth, 0, sizeof(eth));
  50         memset(&grh, 0, sizeof(grh));
  51
  52         ah->sgid_index = attr->grh.sgid_index;
  53
  54         vlan_tag = rdma_get_vlan_id(&attr->grh.dgid);
  55         if (vlan_tag && (vlan_tag < 0x1000)) {
  56                 eth.eth_type = cpu_to_be16(0x8100);
  57                 eth.roce_eth_type = cpu_to_be16(OCRDMA_ROCE_ETH_TYPE);
  58                 vlan_tag |= (attr->sl & 7) << 13;
  59                 eth.vlan_tag = cpu_to_be16(vlan_tag);
  60                 eth_sz = sizeof(struct ocrdma_eth_vlan);
  61                 vlan_enabled = true;
  62         } else {
  63                 eth.eth_type = cpu_to_be16(OCRDMA_ROCE_ETH_TYPE);
  64                 eth_sz = sizeof(struct ocrdma_eth_basic);
  65         }
  66         memcpy(&eth.smac[0], &dev->nic_info.mac_addr[0], ETH_ALEN);
  67         status = ocrdma_resolve_dgid(dev, &attr->grh.dgid, &eth.dmac[0]);
  68         if (status)
  69                 return status;
  70         status = ocrdma_query_gid(&dev->ibdev, 1, attr->grh.sgid_index,
  71                         (union ib_gid *)&grh.sgid[0]);
  72         if (status)
  73                 return status;
  74
  75         grh.tclass_flow = cpu_to_be32((6 << 28) |
  76                         (attr->grh.traffic_class << 24) |
  77                         attr->grh.flow_label);
  78         /* 0x1b is next header value in GRH */
  79         grh.pdid_hoplimit = cpu_to_be32((pdid << 16) |
  80                         (0x1b << 8) | attr->grh.hop_limit);
  81
  82         memcpy(&grh.dgid[0], attr->grh.dgid.raw, sizeof(attr->grh.dgid.raw));
  83         memcpy(&ah->av->eth_hdr, &eth, eth_sz);
  84         memcpy((u8 *)ah->av + eth_sz, &grh, sizeof(struct ocrdma_grh));
  85         if (vlan_enabled)
  86                 ah->av->valid |= OCRDMA_AV_VLAN_VALID;
  87         return status;
  88 }
  89
  90 struct ib_ah *ocrdma_create_ah(struct ib_pd *ibpd, struct ib_ah_attr *attr)
  91 {
  92         u32 *ahid_addr;
  93         int status;
  94         struct ocrdma_ah *ah;
  95         struct ocrdma_pd *pd = get_ocrdma_pd(ibpd);
  96         struct ocrdma_dev *dev = pd->dev;
  97
  98         if (!(attr->ah_flags & IB_AH_GRH))
  99                 return ERR_PTR(-EINVAL);
 100
 101         ah = kzalloc(sizeof *ah, GFP_ATOMIC);
 102         if (!ah)
 103                 return ERR_PTR(-ENOMEM);
 104         ah->dev = pd->dev;
 105
 106         status = ocrdma_alloc_av(dev, ah);
 107         if (status)
 108                 goto av_err;
 109         status = set_av_attr(ah, attr, pd->id);
 110         if (status)
 111                 goto av_conf_err;
 112
 113         /* if pd is for the user process, pass the ah_id to user space */
 114         if ((pd->uctx) && (pd->uctx->ah_tbl.va)) {
 115                 ahid_addr = pd->uctx->ah_tbl.va + attr->dlid;
 116                 *ahid_addr = ah->id;
 117         }
 118         return &ah->ibah;
 119
 120 av_conf_err:
 121         ocrdma_free_av(dev, ah);
 122 av_err:
 123         kfree(ah);
 124         return ERR_PTR(status);
 125 }
 126
 127 int ocrdma_destroy_ah(struct ib_ah *ibah)
 128 {
 129         struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
 130         ocrdma_free_av(ah->dev, ah);
 131         kfree(ah);
 132         return 0;
 133 }
 134
 135 int ocrdma_query_ah(struct ib_ah *ibah, struct ib_ah_attr *attr)
 136 {
 137         struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
 138         struct ocrdma_av *av = ah->av;
 139         struct ocrdma_grh *grh;
 140         attr->ah_flags |= IB_AH_GRH;
 141         if (ah->av->valid & Bit(1)) {
 142                 grh = (struct ocrdma_grh *)((u8 *)ah->av +
 143                                 sizeof(struct ocrdma_eth_vlan));
 144                 attr->sl = be16_to_cpu(av->eth_hdr.vlan_tag) >> 13;
 145         } else {
 146                 grh = (struct ocrdma_grh *)((u8 *)ah->av +
 147                                         sizeof(struct ocrdma_eth_basic));
 148                 attr->sl = 0;
 149         }
 150         memcpy(&attr->grh.dgid.raw[0], &grh->dgid[0], sizeof(grh->dgid));
 151         attr->grh.sgid_index = ah->sgid_index;
 152         attr->grh.hop_limit = be32_to_cpu(grh->pdid_hoplimit) & 0xff;
 153         attr->grh.traffic_class = be32_to_cpu(grh->tclass_flow) >> 24;
 154         attr->grh.flow_label = be32_to_cpu(grh->tclass_flow) & 0x00ffffffff;
 155         return 0;
 156 }
 157
 158 int ocrdma_modify_ah(struct ib_ah *ibah, struct ib_ah_attr *attr)
 159 {
 160         /* modify_ah is unsupported */
 161         return -ENOSYS;
 162 }
 163
 164 int ocrdma_process_mad(struct ib_device *ibdev,
 165                        int process_mad_flags,
 166                        u8 port_num,
 167                        struct ib_wc *in_wc,
 168                        struct ib_grh *in_grh,
 169                        struct ib_mad *in_mad, struct ib_mad *out_mad)
 170 {
 171         return IB_MAD_RESULT_SUCCESS;
 172 }