drivers/scsi/qedf/qedf_fip.c

   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 }