drivers/infiniband/hw/hns/hns_roce_ah.c

   1 /*
   2  * Copyright (c) 2016 Hisilicon Limited.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/platform_device.h>
  34 #include <rdma/ib_addr.h>
  35 #include <rdma/ib_cache.h>
  36 #include "hns_roce_device.h"
  37
  38 #define HNS_ROCE_PORT_NUM_SHIFT         24
  39 #define HNS_ROCE_VLAN_SL_BIT_MASK       7
  40 #define HNS_ROCE_VLAN_SL_SHIFT          13
  41
  42 struct ib_ah *hns_roce_create_ah(struct ib_pd *ibpd, struct ib_ah_attr *ah_attr)
  43 {
  44         struct hns_roce_dev *hr_dev = to_hr_dev(ibpd->device);
  45         struct device *dev = &hr_dev->pdev->dev;
  46         struct ib_gid_attr gid_attr;
  47         struct hns_roce_ah *ah;
  48         u16 vlan_tag = 0xffff;
  49         struct in6_addr in6;
  50         union ib_gid sgid;
  51         int ret;
  52
  53         ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
  54         if (!ah)
  55                 return ERR_PTR(-ENOMEM);
  56
  57         /* Get mac address */
  58         memcpy(&in6, ah_attr->grh.dgid.raw, sizeof(ah_attr->grh.dgid.raw));
  59         if (rdma_is_multicast_addr(&in6))
  60                 rdma_get_mcast_mac(&in6, ah->av.mac);
  61         else
  62                 memcpy(ah->av.mac, ah_attr->dmac, sizeof(ah_attr->dmac));
  63
  64         /* Get source gid */
  65         ret = ib_get_cached_gid(ibpd->device, ah_attr->port_num,
  66                                 ah_attr->grh.sgid_index, &sgid, &gid_attr);
  67         if (ret) {
  68                 dev_err(dev, "get sgid failed! ret = %d\n", ret);
  69                 kfree(ah);
  70                 return ERR_PTR(ret);
  71         }
  72
  73         if (gid_attr.ndev) {
  74                 if (is_vlan_dev(gid_attr.ndev))
  75                         vlan_tag = vlan_dev_vlan_id(gid_attr.ndev);
  76                 dev_put(gid_attr.ndev);
  77         }
  78
  79         if (vlan_tag < 0x1000)
  80                 vlan_tag |= (ah_attr->sl & HNS_ROCE_VLAN_SL_BIT_MASK) <<
  81                              HNS_ROCE_VLAN_SL_SHIFT;
  82
  83         ah->av.port_pd = cpu_to_be32(to_hr_pd(ibpd)->pdn | (ah_attr->port_num <<
  84                                      HNS_ROCE_PORT_NUM_SHIFT));
  85         ah->av.gid_index = ah_attr->grh.sgid_index;
  86         ah->av.vlan = cpu_to_le16(vlan_tag);
  87         dev_dbg(dev, "gid_index = 0x%x,vlan = 0x%x\n", ah->av.gid_index,
  88                 ah->av.vlan);
  89
  90         if (ah_attr->static_rate)
  91                 ah->av.stat_rate = IB_RATE_10_GBPS;
  92
  93         memcpy(ah->av.dgid, ah_attr->grh.dgid.raw, HNS_ROCE_GID_SIZE);
  94         ah->av.sl_tclass_flowlabel = cpu_to_le32(ah_attr->sl <<
  95                                                  HNS_ROCE_SL_SHIFT);
  96
  97         return &ah->ibah;
  98 }
  99
 100 int hns_roce_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
 101 {
 102         struct hns_roce_ah *ah = to_hr_ah(ibah);
 103
 104         memset(ah_attr, 0, sizeof(*ah_attr));
 105
 106         ah_attr->sl = le32_to_cpu(ah->av.sl_tclass_flowlabel) >>
 107                                   HNS_ROCE_SL_SHIFT;
 108         ah_attr->port_num = le32_to_cpu(ah->av.port_pd) >>
 109                                         HNS_ROCE_PORT_NUM_SHIFT;
 110         ah_attr->static_rate = ah->av.stat_rate;
 111         ah_attr->ah_flags = IB_AH_GRH;
 112         ah_attr->grh.traffic_class = le32_to_cpu(ah->av.sl_tclass_flowlabel) >>
 113                                                  HNS_ROCE_TCLASS_SHIFT;
 114         ah_attr->grh.flow_label = le32_to_cpu(ah->av.sl_tclass_flowlabel) &
 115                                               HNS_ROCE_FLOW_LABLE_MASK;
 116         ah_attr->grh.hop_limit = ah->av.hop_limit;
 117         ah_attr->grh.sgid_index = ah->av.gid_index;
 118         memcpy(ah_attr->grh.dgid.raw, ah->av.dgid, HNS_ROCE_GID_SIZE);
 119
 120         return 0;
 121 }
 122
 123 int hns_roce_destroy_ah(struct ib_ah *ah)
 124 {
 125         kfree(to_hr_ah(ah));
 126
 127         return 0;
 128 }