LXR linux/drivers/scsi/qedf/qedf

   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
  10extern const struct qed_fcoe_ops *qed_ops;
  11/*
  12 * FIP VLAN functions that will eventually move to libfcoe.
  13 */
  14
  15void 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 = -1;
  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
  79static 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
 121void 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
 165static u8 fcoe_all_enode[ETH_ALEN] = FIP_ALL_ENODE_MACS;
 166
 167/* Process incoming FIP frames. */
 168void 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
 296u8 *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