1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * QLogic FCoE Offload Driver 4 * Copyright (c) 2016-2018 Cavium Inc. 5 */ 6 #include <linux/if_ether.h> 7 #include <linux/if_vlan.h> 8 #include "qedf.h" 9 10 extern const struct qed_fcoe_ops *qed_ops; 11 /* 12 * FIP VLAN functions that will eventually move to libfcoe. 13 */ 14 qedf_fcoe_send_vlan_req(struct qedf_ctx * qedf)15 void qedf_fcoe_send_vlan_req(struct qedf_ctx *qedf) 16 { 17 struct sk_buff *skb; 18 char *eth_fr; 19 struct fip_vlan *vlan; 20 #define MY_FIP_ALL_FCF_MACS ((__u8[6]) { 1, 0x10, 0x18, 1, 0, 2 }) 21 static u8 my_fcoe_all_fcfs[ETH_ALEN] = MY_FIP_ALL_FCF_MACS; 22 unsigned long flags = 0; 23 int rc; 24 25 skb = dev_alloc_skb(sizeof(struct fip_vlan)); 26 if (!skb) { 27 QEDF_ERR(&qedf->dbg_ctx, 28 "Failed to allocate skb.\n"); 29 return; 30 } 31 32 eth_fr = (char *)skb->data; 33 vlan = (struct fip_vlan *)eth_fr; 34 35 memset(vlan, 0, sizeof(*vlan)); 36 ether_addr_copy(vlan->eth.h_source, qedf->mac); 37 ether_addr_copy(vlan->eth.h_dest, my_fcoe_all_fcfs); 38 vlan->eth.h_proto = htons(ETH_P_FIP); 39 40 vlan->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER); 41 vlan->fip.fip_op = htons(FIP_OP_VLAN); 42 vlan->fip.fip_subcode = FIP_SC_VL_REQ; 43 vlan->fip.fip_dl_len = htons(sizeof(vlan->desc) / FIP_BPW); 44 45 vlan->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC; 46 vlan->desc.mac.fd_desc.fip_dlen = sizeof(vlan->desc.mac) / FIP_BPW; 47 ether_addr_copy(vlan->desc.mac.fd_mac, qedf->mac); 48 49 vlan->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME; 50 vlan->desc.wwnn.fd_desc.fip_dlen = sizeof(vlan->desc.wwnn) / FIP_BPW; 51 put_unaligned_be64(qedf->lport->wwnn, &vlan->desc.wwnn.fd_wwn); 52 53 skb_put(skb, sizeof(*vlan)); 54 skb->protocol = htons(ETH_P_FIP); 55 skb_reset_mac_header(skb); 56 skb_reset_network_header(skb); 57 58 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "Sending FIP VLAN " 59 "request."); 60 61 if (atomic_read(&qedf->link_state) != QEDF_LINK_UP) { 62 QEDF_WARN(&(qedf->dbg_ctx), "Cannot send vlan request " 63 "because link is not up.\n"); 64 65 kfree_skb(skb); 66 return; 67 } 68 69 set_bit(QED_LL2_XMIT_FLAGS_FIP_DISCOVERY, &flags); 70 rc = qed_ops->ll2->start_xmit(qedf->cdev, skb, flags); 71 if (rc) { 72 QEDF_ERR(&qedf->dbg_ctx, "start_xmit failed rc = %d.\n", rc); 73 kfree_skb(skb); 74 return; 75 } 76 77 } 78 qedf_fcoe_process_vlan_resp(struct qedf_ctx * qedf,struct sk_buff * skb)79 static void qedf_fcoe_process_vlan_resp(struct qedf_ctx *qedf, 80 struct sk_buff *skb) 81 { 82 struct fip_header *fiph; 83 struct fip_desc *desc; 84 u16 vid = 0; 85 ssize_t rlen; 86 size_t dlen; 87 88 fiph = (struct fip_header *)(((void *)skb->data) + 2 * ETH_ALEN + 2); 89 90 rlen = ntohs(fiph->fip_dl_len) * 4; 91 desc = (struct fip_desc *)(fiph + 1); 92 while (rlen > 0) { 93 dlen = desc->fip_dlen * FIP_BPW; 94 switch (desc->fip_dtype) { 95 case FIP_DT_VLAN: 96 vid = ntohs(((struct fip_vlan_desc *)desc)->fd_vlan); 97 break; 98 } 99 desc = (struct fip_desc *)((char *)desc + dlen); 100 rlen -= dlen; 101 } 102 103 if (atomic_read(&qedf->link_state) == QEDF_LINK_DOWN) { 104 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_DISC, 105 "Dropping VLAN response as link is down.\n"); 106 return; 107 } 108 109 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "VLAN response, " 110 "vid=0x%x.\n", vid); 111 112 if (vid > 0 && qedf->vlan_id != vid) { 113 qedf_set_vlan_id(qedf, vid); 114 115 /* Inform waiter that it's ok to call fcoe_ctlr_link up() */ 116 if (!completion_done(&qedf->fipvlan_compl)) 117 complete(&qedf->fipvlan_compl); 118 } 119 } 120 qedf_fip_send(struct fcoe_ctlr * fip,struct sk_buff * skb)121 void qedf_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb) 122 { 123 struct qedf_ctx *qedf = container_of(fip, struct qedf_ctx, ctlr); 124 struct ethhdr *eth_hdr; 125 struct fip_header *fiph; 126 u16 op, vlan_tci = 0; 127 u8 sub; 128 int rc = -1; 129 130 if (!test_bit(QEDF_LL2_STARTED, &qedf->flags)) { 131 QEDF_WARN(&(qedf->dbg_ctx), "LL2 not started\n"); 132 kfree_skb(skb); 133 return; 134 } 135 136 fiph = (struct fip_header *) ((void *)skb->data + 2 * ETH_ALEN + 2); 137 eth_hdr = (struct ethhdr *)skb_mac_header(skb); 138 op = ntohs(fiph->fip_op); 139 sub = fiph->fip_subcode; 140 141 /* 142 * Add VLAN tag to non-offload FIP frame based on current stored VLAN 143 * for FIP/FCoE traffic. 144 */ 145 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), qedf->vlan_id); 146 147 /* Get VLAN ID from skb for printing purposes */ 148 __vlan_hwaccel_get_tag(skb, &vlan_tci); 149 150 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2, "FIP frame send: " 151 "dest=%pM op=%x sub=%x vlan=%04x.", eth_hdr->h_dest, op, sub, 152 vlan_tci); 153 if (qedf_dump_frames) 154 print_hex_dump(KERN_WARNING, "fip ", DUMP_PREFIX_OFFSET, 16, 1, 155 skb->data, skb->len, false); 156 157 rc = qed_ops->ll2->start_xmit(qedf->cdev, skb, 0); 158 if (rc) { 159 QEDF_ERR(&qedf->dbg_ctx, "start_xmit failed rc = %d.\n", rc); 160 kfree_skb(skb); 161 return; 162 } 163 } 164 165 static u8 fcoe_all_enode[ETH_ALEN] = FIP_ALL_ENODE_MACS; 166 167 /* Process incoming FIP frames. */ qedf_fip_recv(struct qedf_ctx * qedf,struct sk_buff * skb)168 void qedf_fip_recv(struct qedf_ctx *qedf, struct sk_buff *skb) 169 { 170 struct ethhdr *eth_hdr; 171 struct fip_header *fiph; 172 struct fip_desc *desc; 173 struct fip_mac_desc *mp; 174 struct fip_wwn_desc *wp; 175 struct fip_vn_desc *vp; 176 size_t rlen, dlen; 177 u16 op; 178 u8 sub; 179 bool fcf_valid = false; 180 /* Default is to handle CVL regardless of fabric id descriptor */ 181 bool fabric_id_valid = true; 182 bool fc_wwpn_valid = false; 183 u64 switch_name; 184 u16 vlan = 0; 185 186 eth_hdr = (struct ethhdr *)skb_mac_header(skb); 187 fiph = (struct fip_header *) ((void *)skb->data + 2 * ETH_ALEN + 2); 188 op = ntohs(fiph->fip_op); 189 sub = fiph->fip_subcode; 190 191 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_LL2, 192 "FIP frame received: skb=%p fiph=%p source=%pM destn=%pM op=%x sub=%x vlan=%04x", 193 skb, fiph, eth_hdr->h_source, eth_hdr->h_dest, op, 194 sub, vlan); 195 if (qedf_dump_frames) 196 print_hex_dump(KERN_WARNING, "fip ", DUMP_PREFIX_OFFSET, 16, 1, 197 skb->data, skb->len, false); 198 199 if (!ether_addr_equal(eth_hdr->h_dest, qedf->mac) && 200 !ether_addr_equal(eth_hdr->h_dest, fcoe_all_enode) && 201 !ether_addr_equal(eth_hdr->h_dest, qedf->data_src_addr)) { 202 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_LL2, 203 "Dropping FIP type 0x%x pkt due to destination MAC mismatch dest_mac=%pM ctlr.dest_addr=%pM data_src_addr=%pM.\n", 204 op, eth_hdr->h_dest, qedf->mac, 205 qedf->data_src_addr); 206 kfree_skb(skb); 207 return; 208 } 209 210 /* Handle FIP VLAN resp in the driver */ 211 if (op == FIP_OP_VLAN && sub == FIP_SC_VL_NOTE) { 212 qedf_fcoe_process_vlan_resp(qedf, skb); 213 kfree_skb(skb); 214 } else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK) { 215 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "Clear virtual " 216 "link received.\n"); 217 218 /* Check that an FCF has been selected by fcoe */ 219 if (qedf->ctlr.sel_fcf == NULL) { 220 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, 221 "Dropping CVL since FCF has not been selected " 222 "yet."); 223 kfree_skb(skb); 224 return; 225 } 226 227 /* 228 * We need to loop through the CVL descriptors to determine 229 * if we want to reset the fcoe link 230 */ 231 rlen = ntohs(fiph->fip_dl_len) * FIP_BPW; 232 desc = (struct fip_desc *)(fiph + 1); 233 while (rlen >= sizeof(*desc)) { 234 dlen = desc->fip_dlen * FIP_BPW; 235 switch (desc->fip_dtype) { 236 case FIP_DT_MAC: 237 mp = (struct fip_mac_desc *)desc; 238 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_DISC, 239 "Switch fd_mac=%pM.\n", mp->fd_mac); 240 if (ether_addr_equal(mp->fd_mac, 241 qedf->ctlr.sel_fcf->fcf_mac)) 242 fcf_valid = true; 243 break; 244 case FIP_DT_NAME: 245 wp = (struct fip_wwn_desc *)desc; 246 switch_name = get_unaligned_be64(&wp->fd_wwn); 247 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_DISC, 248 "Switch fd_wwn=%016llx fcf_switch_name=%016llx.\n", 249 switch_name, 250 qedf->ctlr.sel_fcf->switch_name); 251 if (switch_name == 252 qedf->ctlr.sel_fcf->switch_name) 253 fc_wwpn_valid = true; 254 break; 255 case FIP_DT_VN_ID: 256 fabric_id_valid = false; 257 vp = (struct fip_vn_desc *)desc; 258 259 QEDF_ERR(&qedf->dbg_ctx, 260 "CVL vx_port fd_fc_id=0x%x fd_mac=%pM fd_wwpn=%016llx.\n", 261 ntoh24(vp->fd_fc_id), vp->fd_mac, 262 get_unaligned_be64(&vp->fd_wwpn)); 263 /* Check for vx_port wwpn OR Check vx_port 264 * fabric ID OR Check vx_port MAC 265 */ 266 if ((get_unaligned_be64(&vp->fd_wwpn) == 267 qedf->wwpn) || 268 (ntoh24(vp->fd_fc_id) == 269 qedf->lport->port_id) || 270 (ether_addr_equal(vp->fd_mac, 271 qedf->data_src_addr))) { 272 fabric_id_valid = true; 273 } 274 break; 275 default: 276 /* Ignore anything else */ 277 break; 278 } 279 desc = (struct fip_desc *)((char *)desc + dlen); 280 rlen -= dlen; 281 } 282 283 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_DISC, 284 "fcf_valid=%d fabric_id_valid=%d fc_wwpn_valid=%d.\n", 285 fcf_valid, fabric_id_valid, fc_wwpn_valid); 286 if (fcf_valid && fabric_id_valid && fc_wwpn_valid) 287 qedf_ctx_soft_reset(qedf->lport); 288 kfree_skb(skb); 289 } else { 290 /* Everything else is handled by libfcoe */ 291 __skb_pull(skb, ETH_HLEN); 292 fcoe_ctlr_recv(&qedf->ctlr, skb); 293 } 294 } 295 qedf_get_src_mac(struct fc_lport * lport)296 u8 *qedf_get_src_mac(struct fc_lport *lport) 297 { 298 struct qedf_ctx *qedf = lport_priv(lport); 299 300 return qedf->data_src_addr; 301 } 302