1 /* 2 * QLogic FCoE Offload Driver 3 * Copyright (c) 2016-2017 Cavium Inc. 4 * 5 * This software is available under the terms of the GNU General Public License 6 * (GPL) Version 2, available from the file COPYING in the main directory of 7 * this source tree. 8 */ 9 #include <linux/if_ether.h> 10 #include <linux/if_vlan.h> 11 #include "qedf.h" 12 13 extern const struct qed_fcoe_ops *qed_ops; 14 /* 15 * FIP VLAN functions that will eventually move to libfcoe. 16 */ 17 18 void qedf_fcoe_send_vlan_req(struct qedf_ctx *qedf) 19 { 20 struct sk_buff *skb; 21 char *eth_fr; 22 int fr_len; 23 struct fip_vlan *vlan; 24 #define MY_FIP_ALL_FCF_MACS ((__u8[6]) { 1, 0x10, 0x18, 1, 0, 2 }) 25 static u8 my_fcoe_all_fcfs[ETH_ALEN] = MY_FIP_ALL_FCF_MACS; 26 27 skb = dev_alloc_skb(sizeof(struct fip_vlan)); 28 if (!skb) 29 return; 30 31 fr_len = sizeof(*vlan); 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 qed_ops->ll2->start_xmit(qedf->cdev, skb); 69 } 70 71 static void qedf_fcoe_process_vlan_resp(struct qedf_ctx *qedf, 72 struct sk_buff *skb) 73 { 74 struct fip_header *fiph; 75 struct fip_desc *desc; 76 u16 vid = 0; 77 ssize_t rlen; 78 size_t dlen; 79 80 fiph = (struct fip_header *)(((void *)skb->data) + 2 * ETH_ALEN + 2); 81 82 rlen = ntohs(fiph->fip_dl_len) * 4; 83 desc = (struct fip_desc *)(fiph + 1); 84 while (rlen > 0) { 85 dlen = desc->fip_dlen * FIP_BPW; 86 switch (desc->fip_dtype) { 87 case FIP_DT_VLAN: 88 vid = ntohs(((struct fip_vlan_desc *)desc)->fd_vlan); 89 break; 90 } 91 desc = (struct fip_desc *)((char *)desc + dlen); 92 rlen -= dlen; 93 } 94 95 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "VLAN response, " 96 "vid=0x%x.\n", vid); 97 98 if (vid > 0 && qedf->vlan_id != vid) { 99 qedf_set_vlan_id(qedf, vid); 100 101 /* Inform waiter that it's ok to call fcoe_ctlr_link up() */ 102 if (!completion_done(&qedf->fipvlan_compl)) 103 complete(&qedf->fipvlan_compl); 104 } 105 } 106 107 void qedf_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb) 108 { 109 struct qedf_ctx *qedf = container_of(fip, struct qedf_ctx, ctlr); 110 struct ethhdr *eth_hdr; 111 struct fip_header *fiph; 112 u16 op, vlan_tci = 0; 113 u8 sub; 114 115 if (!test_bit(QEDF_LL2_STARTED, &qedf->flags)) { 116 QEDF_WARN(&(qedf->dbg_ctx), "LL2 not started\n"); 117 kfree_skb(skb); 118 return; 119 } 120 121 fiph = (struct fip_header *) ((void *)skb->data + 2 * ETH_ALEN + 2); 122 eth_hdr = (struct ethhdr *)skb_mac_header(skb); 123 op = ntohs(fiph->fip_op); 124 sub = fiph->fip_subcode; 125 126 /* 127 * Add VLAN tag to non-offload FIP frame based on current stored VLAN 128 * for FIP/FCoE traffic. 129 */ 130 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), qedf->vlan_id); 131 132 /* Get VLAN ID from skb for printing purposes */ 133 __vlan_hwaccel_get_tag(skb, &vlan_tci); 134 135 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2, "FIP frame send: " 136 "dest=%pM op=%x sub=%x vlan=%04x.", eth_hdr->h_dest, op, sub, 137 ntohs(vlan_tci)); 138 if (qedf_dump_frames) 139 print_hex_dump(KERN_WARNING, "fip ", DUMP_PREFIX_OFFSET, 16, 1, 140 skb->data, skb->len, false); 141 142 qed_ops->ll2->start_xmit(qedf->cdev, skb); 143 } 144 145 /* Process incoming FIP frames. */ 146 void qedf_fip_recv(struct qedf_ctx *qedf, struct sk_buff *skb) 147 { 148 struct ethhdr *eth_hdr; 149 struct fip_header *fiph; 150 struct fip_desc *desc; 151 struct fip_mac_desc *mp; 152 struct fip_wwn_desc *wp; 153 struct fip_vn_desc *vp; 154 size_t rlen, dlen; 155 u16 op; 156 u8 sub; 157 bool do_reset = false; 158 159 eth_hdr = (struct ethhdr *)skb_mac_header(skb); 160 fiph = (struct fip_header *) ((void *)skb->data + 2 * ETH_ALEN + 2); 161 op = ntohs(fiph->fip_op); 162 sub = fiph->fip_subcode; 163 164 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2, "FIP frame received: " 165 "skb=%p fiph=%p source=%pM op=%x sub=%x", skb, fiph, 166 eth_hdr->h_source, op, sub); 167 if (qedf_dump_frames) 168 print_hex_dump(KERN_WARNING, "fip ", DUMP_PREFIX_OFFSET, 16, 1, 169 skb->data, skb->len, false); 170 171 /* Handle FIP VLAN resp in the driver */ 172 if (op == FIP_OP_VLAN && sub == FIP_SC_VL_NOTE) { 173 qedf_fcoe_process_vlan_resp(qedf, skb); 174 kfree_skb(skb); 175 } else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK) { 176 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "Clear virtual " 177 "link received.\n"); 178 179 /* Check that an FCF has been selected by fcoe */ 180 if (qedf->ctlr.sel_fcf == NULL) { 181 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, 182 "Dropping CVL since FCF has not been selected " 183 "yet."); 184 return; 185 } 186 187 /* 188 * We need to loop through the CVL descriptors to determine 189 * if we want to reset the fcoe link 190 */ 191 rlen = ntohs(fiph->fip_dl_len) * FIP_BPW; 192 desc = (struct fip_desc *)(fiph + 1); 193 while (rlen >= sizeof(*desc)) { 194 dlen = desc->fip_dlen * FIP_BPW; 195 switch (desc->fip_dtype) { 196 case FIP_DT_MAC: 197 mp = (struct fip_mac_desc *)desc; 198 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2, 199 "fd_mac=%pM\n", mp->fd_mac); 200 if (ether_addr_equal(mp->fd_mac, 201 qedf->ctlr.sel_fcf->fcf_mac)) 202 do_reset = true; 203 break; 204 case FIP_DT_NAME: 205 wp = (struct fip_wwn_desc *)desc; 206 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2, 207 "fc_wwpn=%016llx.\n", 208 get_unaligned_be64(&wp->fd_wwn)); 209 break; 210 case FIP_DT_VN_ID: 211 vp = (struct fip_vn_desc *)desc; 212 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2, 213 "fd_fc_id=%x.\n", ntoh24(vp->fd_fc_id)); 214 if (ntoh24(vp->fd_fc_id) == 215 qedf->lport->port_id) 216 do_reset = true; 217 break; 218 default: 219 /* Ignore anything else */ 220 break; 221 } 222 desc = (struct fip_desc *)((char *)desc + dlen); 223 rlen -= dlen; 224 } 225 226 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2, 227 "do_reset=%d.\n", do_reset); 228 if (do_reset) { 229 fcoe_ctlr_link_down(&qedf->ctlr); 230 qedf_wait_for_upload(qedf); 231 fcoe_ctlr_link_up(&qedf->ctlr); 232 } 233 kfree_skb(skb); 234 } else { 235 /* Everything else is handled by libfcoe */ 236 __skb_pull(skb, ETH_HLEN); 237 fcoe_ctlr_recv(&qedf->ctlr, skb); 238 } 239 } 240 241 u8 *qedf_get_src_mac(struct fc_lport *lport) 242 { 243 struct qedf_ctx *qedf = lport_priv(lport); 244 245 return qedf->data_src_addr; 246 } 247