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 33 #include "ocrdma.h" 34 #include "ocrdma_verbs.h" 35 #include "ocrdma_ah.h" 36 #include "ocrdma_hw.h" 37 38 #define OCRDMA_VID_PCP_SHIFT 0xD 39 40 static inline int set_av_attr(struct ocrdma_dev *dev, struct ocrdma_ah *ah, 41 struct ib_ah_attr *attr, union ib_gid *sgid, int pdid) 42 { 43 int status = 0; 44 u16 vlan_tag; bool vlan_enabled = false; 45 struct ocrdma_eth_vlan eth; 46 struct ocrdma_grh grh; 47 int eth_sz; 48 49 memset(ð, 0, sizeof(eth)); 50 memset(&grh, 0, sizeof(grh)); 51 52 /* VLAN */ 53 vlan_tag = attr->vlan_id; 54 if (!vlan_tag || (vlan_tag > 0xFFF)) 55 vlan_tag = dev->pvid; 56 if (vlan_tag && (vlan_tag < 0x1000)) { 57 eth.eth_type = cpu_to_be16(0x8100); 58 eth.roce_eth_type = cpu_to_be16(OCRDMA_ROCE_ETH_TYPE); 59 vlan_tag |= (dev->sl & 0x07) << OCRDMA_VID_PCP_SHIFT; 60 eth.vlan_tag = cpu_to_be16(vlan_tag); 61 eth_sz = sizeof(struct ocrdma_eth_vlan); 62 vlan_enabled = true; 63 } else { 64 eth.eth_type = cpu_to_be16(OCRDMA_ROCE_ETH_TYPE); 65 eth_sz = sizeof(struct ocrdma_eth_basic); 66 } 67 /* MAC */ 68 memcpy(ð.smac[0], &dev->nic_info.mac_addr[0], ETH_ALEN); 69 status = ocrdma_resolve_dmac(dev, attr, ð.dmac[0]); 70 if (status) 71 return status; 72 ah->sgid_index = attr->grh.sgid_index; 73 memcpy(&grh.sgid[0], sgid->raw, sizeof(union ib_gid)); 74 memcpy(&grh.dgid[0], attr->grh.dgid.raw, sizeof(attr->grh.dgid.raw)); 75 76 grh.tclass_flow = cpu_to_be32((6 << 28) | 77 (attr->grh.traffic_class << 24) | 78 attr->grh.flow_label); 79 /* 0x1b is next header value in GRH */ 80 grh.pdid_hoplimit = cpu_to_be32((pdid << 16) | 81 (0x1b << 8) | attr->grh.hop_limit); 82 /* Eth HDR */ 83 memcpy(&ah->av->eth_hdr, ð, 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 ah->av->valid = cpu_to_le32(ah->av->valid); 88 return status; 89 } 90 91 struct ib_ah *ocrdma_create_ah(struct ib_pd *ibpd, struct ib_ah_attr *attr) 92 { 93 u32 *ahid_addr; 94 int status; 95 struct ocrdma_ah *ah; 96 struct ocrdma_pd *pd = get_ocrdma_pd(ibpd); 97 struct ocrdma_dev *dev = get_ocrdma_dev(ibpd->device); 98 union ib_gid sgid; 99 100 if (!(attr->ah_flags & IB_AH_GRH)) 101 return ERR_PTR(-EINVAL); 102 103 if (atomic_cmpxchg(&dev->update_sl, 1, 0)) 104 ocrdma_init_service_level(dev); 105 ah = kzalloc(sizeof(*ah), GFP_ATOMIC); 106 if (!ah) 107 return ERR_PTR(-ENOMEM); 108 109 status = ocrdma_alloc_av(dev, ah); 110 if (status) 111 goto av_err; 112 113 status = ocrdma_query_gid(&dev->ibdev, 1, attr->grh.sgid_index, &sgid); 114 if (status) { 115 pr_err("%s(): Failed to query sgid, status = %d\n", 116 __func__, status); 117 goto av_conf_err; 118 } 119 120 if (pd->uctx) { 121 status = rdma_addr_find_dmac_by_grh(&sgid, &attr->grh.dgid, 122 attr->dmac, &attr->vlan_id); 123 if (status) { 124 pr_err("%s(): Failed to resolve dmac from gid." 125 "status = %d\n", __func__, status); 126 goto av_conf_err; 127 } 128 } 129 130 status = set_av_attr(dev, ah, attr, &sgid, pd->id); 131 if (status) 132 goto av_conf_err; 133 134 /* if pd is for the user process, pass the ah_id to user space */ 135 if ((pd->uctx) && (pd->uctx->ah_tbl.va)) { 136 ahid_addr = pd->uctx->ah_tbl.va + attr->dlid; 137 *ahid_addr = ah->id; 138 } 139 return &ah->ibah; 140 141 av_conf_err: 142 ocrdma_free_av(dev, ah); 143 av_err: 144 kfree(ah); 145 return ERR_PTR(status); 146 } 147 148 int ocrdma_destroy_ah(struct ib_ah *ibah) 149 { 150 struct ocrdma_ah *ah = get_ocrdma_ah(ibah); 151 struct ocrdma_dev *dev = get_ocrdma_dev(ibah->device); 152 153 ocrdma_free_av(dev, ah); 154 kfree(ah); 155 return 0; 156 } 157 158 int ocrdma_query_ah(struct ib_ah *ibah, struct ib_ah_attr *attr) 159 { 160 struct ocrdma_ah *ah = get_ocrdma_ah(ibah); 161 struct ocrdma_av *av = ah->av; 162 struct ocrdma_grh *grh; 163 attr->ah_flags |= IB_AH_GRH; 164 if (ah->av->valid & OCRDMA_AV_VALID) { 165 grh = (struct ocrdma_grh *)((u8 *)ah->av + 166 sizeof(struct ocrdma_eth_vlan)); 167 attr->sl = be16_to_cpu(av->eth_hdr.vlan_tag) >> 13; 168 } else { 169 grh = (struct ocrdma_grh *)((u8 *)ah->av + 170 sizeof(struct ocrdma_eth_basic)); 171 attr->sl = 0; 172 } 173 memcpy(&attr->grh.dgid.raw[0], &grh->dgid[0], sizeof(grh->dgid)); 174 attr->grh.sgid_index = ah->sgid_index; 175 attr->grh.hop_limit = be32_to_cpu(grh->pdid_hoplimit) & 0xff; 176 attr->grh.traffic_class = be32_to_cpu(grh->tclass_flow) >> 24; 177 attr->grh.flow_label = be32_to_cpu(grh->tclass_flow) & 0x00ffffffff; 178 return 0; 179 } 180 181 int ocrdma_modify_ah(struct ib_ah *ibah, struct ib_ah_attr *attr) 182 { 183 /* modify_ah is unsupported */ 184 return -ENOSYS; 185 } 186 187 int ocrdma_process_mad(struct ib_device *ibdev, 188 int process_mad_flags, 189 u8 port_num, 190 struct ib_wc *in_wc, 191 struct ib_grh *in_grh, 192 struct ib_mad *in_mad, struct ib_mad *out_mad) 193 { 194 return IB_MAD_RESULT_SUCCESS; 195 } 196