hw/ocrdma/ocrdma_ah.c

0001 /* This file is part of the Emulex RoCE Device Driver for
0002  * RoCE (RDMA over Converged Ethernet) adapters.
0003  * Copyright (C) 2012-2015 Emulex. All rights reserved.
0004  * EMULEX and SLI are trademarks of Emulex.
0005  * www.emulex.com
0006  *
0007  * This software is available to you under a choice of one of two licenses.
0008  * You may choose to be licensed under the terms of the GNU General Public
0009  * License (GPL) Version 2, available from the file COPYING in the main
0010  * directory of this source tree, or the BSD license below:
0011  *
0012  * Redistribution and use in source and binary forms, with or without
0013  * modification, are permitted provided that the following conditions
0014  * are met:
0015  *
0016  * - Redistributions of source code must retain the above copyright notice,
0017  *   this list of conditions and the following disclaimer.
0018  *
0019  * - Redistributions in binary form must reproduce the above copyright
0020  *   notice, this list of conditions and the following disclaimer in
0021  *   the documentation and/or other materials provided with the distribution.
0022  *
0023  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0024  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,THE
0025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0026  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
0027  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0028  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0029  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
0030  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
0031  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
0032  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
0033  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
0034  *
0035  * Contact Information:
0036  * linux-drivers@emulex.com
0037  *
0038  * Emulex
0039  * 3333 Susan Street
0040  * Costa Mesa, CA 92626
0041  */
0042
0043 #include <net/neighbour.h>
0044 #include <net/netevent.h>
0045
0046 #include <rdma/ib_addr.h>
0047 #include <rdma/ib_mad.h>
0048 #include <rdma/ib_cache.h>
0049
0050 #include "ocrdma.h"
0051 #include "ocrdma_verbs.h"
0052 #include "ocrdma_ah.h"
0053 #include "ocrdma_hw.h"
0054 #include "ocrdma_stats.h"
0055
0056 #define OCRDMA_VID_PCP_SHIFT    0xD
0057
0058 static u16 ocrdma_hdr_type_to_proto_num(int devid, u8 hdr_type)
0059 {
0060     switch (hdr_type) {
0061     case OCRDMA_L3_TYPE_IB_GRH:
0062         return (u16)ETH_P_IBOE;
0063     case OCRDMA_L3_TYPE_IPV4:
0064         return (u16)0x0800;
0065     case OCRDMA_L3_TYPE_IPV6:
0066         return (u16)0x86dd;
0067     default:
0068         pr_err("ocrdma%d: Invalid network header\n", devid);
0069         return 0;
0070     }
0071 }
0072
0073 static inline int set_av_attr(struct ocrdma_dev *dev, struct ocrdma_ah *ah,
0074             struct rdma_ah_attr *attr, const union ib_gid *sgid,
0075             int pdid, bool *isvlan, u16 vlan_tag)
0076 {
0077     int status;
0078     struct ocrdma_eth_vlan eth;
0079     struct ocrdma_grh grh;
0080     int eth_sz;
0081     u16 proto_num = 0;
0082     u8 nxthdr = 0x11;
0083     struct iphdr ipv4;
0084     const struct ib_global_route *ib_grh;
0085     union {
0086         struct sockaddr_in  _sockaddr_in;
0087         struct sockaddr_in6 _sockaddr_in6;
0088     } sgid_addr, dgid_addr;
0089
0090     memset(&eth, 0, sizeof(eth));
0091     memset(&grh, 0, sizeof(grh));
0092
0093     /* Protocol Number */
0094     proto_num = ocrdma_hdr_type_to_proto_num(dev->id, ah->hdr_type);
0095     if (!proto_num)
0096         return -EINVAL;
0097     nxthdr = (proto_num == ETH_P_IBOE) ? 0x1b : 0x11;
0098     /* VLAN */
0099     if (!vlan_tag || (vlan_tag > 0xFFF))
0100         vlan_tag = dev->pvid;
0101     if (vlan_tag || dev->pfc_state) {
0102         if (!vlan_tag) {
0103             pr_err("ocrdma%d:Using VLAN with PFC is recommended\n",
0104                 dev->id);
0105             pr_err("ocrdma%d:Using VLAN 0 for this connection\n",
0106                 dev->id);
0107         }
0108         eth.eth_type = cpu_to_be16(0x8100);
0109         eth.roce_eth_type = cpu_to_be16(proto_num);
0110         vlan_tag |= (dev->sl & 0x07) << OCRDMA_VID_PCP_SHIFT;
0111         eth.vlan_tag = cpu_to_be16(vlan_tag);
0112         eth_sz = sizeof(struct ocrdma_eth_vlan);
0113         *isvlan = true;
0114     } else {
0115         eth.eth_type = cpu_to_be16(proto_num);
0116         eth_sz = sizeof(struct ocrdma_eth_basic);
0117     }
0118     /* MAC */
0119     memcpy(&eth.smac[0], &dev->nic_info.mac_addr[0], ETH_ALEN);
0120     status = ocrdma_resolve_dmac(dev, attr, &eth.dmac[0]);
0121     if (status)
0122         return status;
0123     ib_grh = rdma_ah_read_grh(attr);
0124     ah->sgid_index = ib_grh->sgid_index;
0125     /* Eth HDR */
0126     memcpy(&ah->av->eth_hdr, &eth, eth_sz);
0127     if (ah->hdr_type == RDMA_NETWORK_IPV4) {
0128         *((__be16 *)&ipv4) = htons((4 << 12) | (5 << 8) |
0129                        ib_grh->traffic_class);
0130         ipv4.id = cpu_to_be16(pdid);
0131         ipv4.frag_off = htons(IP_DF);
0132         ipv4.tot_len = htons(0);
0133         ipv4.ttl = ib_grh->hop_limit;
0134         ipv4.protocol = nxthdr;
0135         rdma_gid2ip((struct sockaddr *)&sgid_addr, sgid);
0136         ipv4.saddr = sgid_addr._sockaddr_in.sin_addr.s_addr;
0137         rdma_gid2ip((struct sockaddr*)&dgid_addr, &ib_grh->dgid);
0138         ipv4.daddr = dgid_addr._sockaddr_in.sin_addr.s_addr;
0139         memcpy((u8 *)ah->av + eth_sz, &ipv4, sizeof(struct iphdr));
0140     } else {
0141         memcpy(&grh.sgid[0], sgid->raw, sizeof(union ib_gid));
0142         grh.tclass_flow = cpu_to_be32((6 << 28) |
0143                           (ib_grh->traffic_class << 24) |
0144                           ib_grh->flow_label);
0145         memcpy(&grh.dgid[0], ib_grh->dgid.raw,
0146                sizeof(ib_grh->dgid.raw));
0147         grh.pdid_hoplimit = cpu_to_be32((pdid << 16) |
0148                         (nxthdr << 8) |
0149                         ib_grh->hop_limit);
0150         memcpy((u8 *)ah->av + eth_sz, &grh, sizeof(struct ocrdma_grh));
0151     }
0152     if (*isvlan)
0153         ah->av->valid |= OCRDMA_AV_VLAN_VALID;
0154     ah->av->valid = cpu_to_le32(ah->av->valid);
0155     return status;
0156 }
0157
0158 int ocrdma_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
0159              struct ib_udata *udata)
0160 {
0161     u32 *ahid_addr;
0162     int status;
0163     struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
0164     bool isvlan = false;
0165     u16 vlan_tag = 0xffff;
0166     const struct ib_gid_attr *sgid_attr;
0167     struct ocrdma_pd *pd = get_ocrdma_pd(ibah->pd);
0168     struct rdma_ah_attr *attr = init_attr->ah_attr;
0169     struct ocrdma_dev *dev = get_ocrdma_dev(ibah->device);
0170
0171     if ((attr->type != RDMA_AH_ATTR_TYPE_ROCE) ||
0172         !(rdma_ah_get_ah_flags(attr) & IB_AH_GRH))
0173         return -EINVAL;
0174
0175     if (atomic_cmpxchg(&dev->update_sl, 1, 0))
0176         ocrdma_init_service_level(dev);
0177
0178     sgid_attr = attr->grh.sgid_attr;
0179     status = rdma_read_gid_l2_fields(sgid_attr, &vlan_tag, NULL);
0180     if (status)
0181         return status;
0182
0183     status = ocrdma_alloc_av(dev, ah);
0184     if (status)
0185         goto av_err;
0186
0187     /* Get network header type for this GID */
0188     ah->hdr_type = rdma_gid_attr_network_type(sgid_attr);
0189
0190     status = set_av_attr(dev, ah, attr, &sgid_attr->gid, pd->id,
0191                  &isvlan, vlan_tag);
0192     if (status)
0193         goto av_conf_err;
0194
0195     /* if pd is for the user process, pass the ah_id to user space */
0196     if ((pd->uctx) && (pd->uctx->ah_tbl.va)) {
0197         ahid_addr = pd->uctx->ah_tbl.va + rdma_ah_get_dlid(attr);
0198         *ahid_addr = 0;
0199         *ahid_addr |= ah->id & OCRDMA_AH_ID_MASK;
0200         if (ocrdma_is_udp_encap_supported(dev)) {
0201             *ahid_addr |= ((u32)ah->hdr_type &
0202                        OCRDMA_AH_L3_TYPE_MASK) <<
0203                        OCRDMA_AH_L3_TYPE_SHIFT;
0204         }
0205         if (isvlan)
0206             *ahid_addr |= (OCRDMA_AH_VLAN_VALID_MASK <<
0207                        OCRDMA_AH_VLAN_VALID_SHIFT);
0208     }
0209
0210     return 0;
0211
0212 av_conf_err:
0213     ocrdma_free_av(dev, ah);
0214 av_err:
0215     return status;
0216 }
0217
0218 int ocrdma_destroy_ah(struct ib_ah *ibah, u32 flags)
0219 {
0220     struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
0221     struct ocrdma_dev *dev = get_ocrdma_dev(ibah->device);
0222
0223     ocrdma_free_av(dev, ah);
0224     return 0;
0225 }
0226
0227 int ocrdma_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *attr)
0228 {
0229     struct ocrdma_ah *ah = get_ocrdma_ah(ibah);
0230     struct ocrdma_av *av = ah->av;
0231     struct ocrdma_grh *grh;
0232
0233     attr->type = ibah->type;
0234     if (ah->av->valid & OCRDMA_AV_VALID) {
0235         grh = (struct ocrdma_grh *)((u8 *)ah->av +
0236                 sizeof(struct ocrdma_eth_vlan));
0237         rdma_ah_set_sl(attr, be16_to_cpu(av->eth_hdr.vlan_tag) >> 13);
0238     } else {
0239         grh = (struct ocrdma_grh *)((u8 *)ah->av +
0240                     sizeof(struct ocrdma_eth_basic));
0241         rdma_ah_set_sl(attr, 0);
0242     }
0243     rdma_ah_set_grh(attr, NULL,
0244             be32_to_cpu(grh->tclass_flow) & 0xffffffff,
0245             ah->sgid_index,
0246             be32_to_cpu(grh->pdid_hoplimit) & 0xff,
0247             be32_to_cpu(grh->tclass_flow) >> 24);
0248     rdma_ah_set_dgid_raw(attr, &grh->dgid[0]);
0249     return 0;
0250 }
0251
0252 int ocrdma_process_mad(struct ib_device *ibdev, int process_mad_flags,
0253                u32 port_num, const struct ib_wc *in_wc,
0254                const struct ib_grh *in_grh, const struct ib_mad *in,
0255                struct ib_mad *out, size_t *out_mad_size,
0256                u16 *out_mad_pkey_index)
0257 {
0258     int status = IB_MAD_RESULT_SUCCESS;
0259     struct ocrdma_dev *dev;
0260
0261     if (in->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT) {
0262         dev = get_ocrdma_dev(ibdev);
0263         ocrdma_pma_counters(dev, out);
0264         status |= IB_MAD_RESULT_REPLY;
0265     }
0266
0267     return status;
0268 }