drivers/scsi/qedf/qedf_fip.c

   1 /*
   2  *  QLogic FCoE Offload Driver
   3  *  Copyright (c) 2016-2018 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         unsigned long flags = 0;
  27
  28         skb = dev_alloc_skb(sizeof(struct fip_vlan));
  29         if (!skb)
  30                 return;
  31
  32         fr_len = sizeof(*vlan);
  33         eth_fr = (char *)skb->data;
  34         vlan = (struct fip_vlan *)eth_fr;
  35
  36         memset(vlan, 0, sizeof(*vlan));
  37         ether_addr_copy(vlan->eth.h_source, qedf->mac);
  38         ether_addr_copy(vlan->eth.h_dest, my_fcoe_all_fcfs);
  39         vlan->eth.h_proto = htons(ETH_P_FIP);
  40
  41         vlan->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
  42         vlan->fip.fip_op = htons(FIP_OP_VLAN);
  43         vlan->fip.fip_subcode = FIP_SC_VL_REQ;
  44         vlan->fip.fip_dl_len = htons(sizeof(vlan->desc) / FIP_BPW);
  45
  46         vlan->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
  47         vlan->desc.mac.fd_desc.fip_dlen = sizeof(vlan->desc.mac) / FIP_BPW;
  48         ether_addr_copy(vlan->desc.mac.fd_mac, qedf->mac);
  49
  50         vlan->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
  51         vlan->desc.wwnn.fd_desc.fip_dlen = sizeof(vlan->desc.wwnn) / FIP_BPW;
  52         put_unaligned_be64(qedf->lport->wwnn, &vlan->desc.wwnn.fd_wwn);
  53
  54         skb_put(skb, sizeof(*vlan));
  55         skb->protocol = htons(ETH_P_FIP);
  56         skb_reset_mac_header(skb);
  57         skb_reset_network_header(skb);
  58
  59         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "Sending FIP VLAN "
  60                    "request.");
  61
  62         if (atomic_read(&qedf->link_state) != QEDF_LINK_UP) {
  63                 QEDF_WARN(&(qedf->dbg_ctx), "Cannot send vlan request "
  64                     "because link is not up.\n");
  65
  66                 kfree_skb(skb);
  67                 return;
  68         }
  69
  70         set_bit(QED_LL2_XMIT_FLAGS_FIP_DISCOVERY, &flags);
  71         qed_ops->ll2->start_xmit(qedf->cdev, skb, flags);
  72 }
  73
  74 static void qedf_fcoe_process_vlan_resp(struct qedf_ctx *qedf,
  75         struct sk_buff *skb)
  76 {
  77         struct fip_header *fiph;
  78         struct fip_desc *desc;
  79         u16 vid = 0;
  80         ssize_t rlen;
  81         size_t dlen;
  82
  83         fiph = (struct fip_header *)(((void *)skb->data) + 2 * ETH_ALEN + 2);
  84
  85         rlen = ntohs(fiph->fip_dl_len) * 4;
  86         desc = (struct fip_desc *)(fiph + 1);
  87         while (rlen > 0) {
  88                 dlen = desc->fip_dlen * FIP_BPW;
  89                 switch (desc->fip_dtype) {
  90                 case FIP_DT_VLAN:
  91                         vid = ntohs(((struct fip_vlan_desc *)desc)->fd_vlan);
  92                         break;
  93                 }
  94                 desc = (struct fip_desc *)((char *)desc + dlen);
  95                 rlen -= dlen;
  96         }
  97
  98         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "VLAN response, "
  99                    "vid=0x%x.\n", vid);
 100
 101         if (vid > 0 && qedf->vlan_id != vid) {
 102                 qedf_set_vlan_id(qedf, vid);
 103
 104                 /* Inform waiter that it's ok to call fcoe_ctlr_link up() */
 105                 if (!completion_done(&qedf->fipvlan_compl))
 106                         complete(&qedf->fipvlan_compl);
 107         }
 108 }
 109
 110 void qedf_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
 111 {
 112         struct qedf_ctx *qedf = container_of(fip, struct qedf_ctx, ctlr);
 113         struct ethhdr *eth_hdr;
 114         struct fip_header *fiph;
 115         u16 op, vlan_tci = 0;
 116         u8 sub;
 117
 118         if (!test_bit(QEDF_LL2_STARTED, &qedf->flags)) {
 119                 QEDF_WARN(&(qedf->dbg_ctx), "LL2 not started\n");
 120                 kfree_skb(skb);
 121                 return;
 122         }
 123
 124         fiph = (struct fip_header *) ((void *)skb->data + 2 * ETH_ALEN + 2);
 125         eth_hdr = (struct ethhdr *)skb_mac_header(skb);
 126         op = ntohs(fiph->fip_op);
 127         sub = fiph->fip_subcode;
 128
 129         /*
 130          * Add VLAN tag to non-offload FIP frame based on current stored VLAN
 131          * for FIP/FCoE traffic.
 132          */
 133         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), qedf->vlan_id);
 134
 135         /* Get VLAN ID from skb for printing purposes */
 136         __vlan_hwaccel_get_tag(skb, &vlan_tci);
 137
 138         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2, "FIP frame send: "
 139             "dest=%pM op=%x sub=%x vlan=%04x.", eth_hdr->h_dest, op, sub,
 140             vlan_tci);
 141         if (qedf_dump_frames)
 142                 print_hex_dump(KERN_WARNING, "fip ", DUMP_PREFIX_OFFSET, 16, 1,
 143                     skb->data, skb->len, false);
 144
 145         qed_ops->ll2->start_xmit(qedf->cdev, skb, 0);
 146 }
 147
 148 /* Process incoming FIP frames. */
 149 void qedf_fip_recv(struct qedf_ctx *qedf, struct sk_buff *skb)
 150 {
 151         struct ethhdr *eth_hdr;
 152         struct fip_header *fiph;
 153         struct fip_desc *desc;
 154         struct fip_mac_desc *mp;
 155         struct fip_wwn_desc *wp;
 156         struct fip_vn_desc *vp;
 157         size_t rlen, dlen;
 158         u16 op;
 159         u8 sub;
 160         bool do_reset = false;
 161
 162         eth_hdr = (struct ethhdr *)skb_mac_header(skb);
 163         fiph = (struct fip_header *) ((void *)skb->data + 2 * ETH_ALEN + 2);
 164         op = ntohs(fiph->fip_op);
 165         sub = fiph->fip_subcode;
 166
 167         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2, "FIP frame received: "
 168             "skb=%p fiph=%p source=%pM op=%x sub=%x", skb, fiph,
 169             eth_hdr->h_source, op, sub);
 170         if (qedf_dump_frames)
 171                 print_hex_dump(KERN_WARNING, "fip ", DUMP_PREFIX_OFFSET, 16, 1,
 172                     skb->data, skb->len, false);
 173
 174         /* Handle FIP VLAN resp in the driver */
 175         if (op == FIP_OP_VLAN && sub == FIP_SC_VL_NOTE) {
 176                 qedf_fcoe_process_vlan_resp(qedf, skb);
 177                 kfree_skb(skb);
 178         } else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK) {
 179                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "Clear virtual "
 180                            "link received.\n");
 181
 182                 /* Check that an FCF has been selected by fcoe */
 183                 if (qedf->ctlr.sel_fcf == NULL) {
 184                         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC,
 185                             "Dropping CVL since FCF has not been selected "
 186                             "yet.");
 187                         kfree_skb(skb);
 188                         return;
 189                 }
 190
 191                 /*
 192                  * We need to loop through the CVL descriptors to determine
 193                  * if we want to reset the fcoe link
 194                  */
 195                 rlen = ntohs(fiph->fip_dl_len) * FIP_BPW;
 196                 desc = (struct fip_desc *)(fiph + 1);
 197                 while (rlen >= sizeof(*desc)) {
 198                         dlen = desc->fip_dlen * FIP_BPW;
 199                         switch (desc->fip_dtype) {
 200                         case FIP_DT_MAC:
 201                                 mp = (struct fip_mac_desc *)desc;
 202                                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
 203                                     "fd_mac=%pM\n", mp->fd_mac);
 204                                 if (ether_addr_equal(mp->fd_mac,
 205                                     qedf->ctlr.sel_fcf->fcf_mac))
 206                                         do_reset = true;
 207                                 break;
 208                         case FIP_DT_NAME:
 209                                 wp = (struct fip_wwn_desc *)desc;
 210                                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
 211                                     "fc_wwpn=%016llx.\n",
 212                                     get_unaligned_be64(&wp->fd_wwn));
 213                                 break;
 214                         case FIP_DT_VN_ID:
 215                                 vp = (struct fip_vn_desc *)desc;
 216                                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
 217                                     "fd_fc_id=%x.\n", ntoh24(vp->fd_fc_id));
 218                                 if (ntoh24(vp->fd_fc_id) ==
 219                                     qedf->lport->port_id)
 220                                         do_reset = true;
 221                                 break;
 222                         default:
 223                                 /* Ignore anything else */
 224                                 break;
 225                         }
 226                         desc = (struct fip_desc *)((char *)desc + dlen);
 227                         rlen -= dlen;
 228                 }
 229
 230                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
 231                     "do_reset=%d.\n", do_reset);
 232                 if (do_reset) {
 233                         fcoe_ctlr_link_down(&qedf->ctlr);
 234                         qedf_wait_for_upload(qedf);
 235                         fcoe_ctlr_link_up(&qedf->ctlr);
 236                 }
 237                 kfree_skb(skb);
 238         } else {
 239                 /* Everything else is handled by libfcoe */
 240                 __skb_pull(skb, ETH_HLEN);
 241                 fcoe_ctlr_recv(&qedf->ctlr, skb);
 242         }
 243 }
 244
 245 u8 *qedf_get_src_mac(struct fc_lport *lport)
 246 {
 247         struct qedf_ctx *qedf = lport_priv(lport);
 248
 249         return qedf->data_src_addr;
 250 }