bnx2fc_els.c

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/*
 * bnx2fc_els.c: Broadcom NetXtreme II Linux FCoE offload driver.
 * This file contains helper routines that handle ELS requests
 * and responses.
 *
 * Copyright (c) 2008 - 2011 Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 *
 * Written by: Bhanu Prakash Gollapudi ([email protected])
 */

#include "bnx2fc.h"

static void bnx2fc_logo_resp(struct fc_seq *seq, struct fc_frame *fp,
                 void *arg);
static void bnx2fc_flogi_resp(struct fc_seq *seq, struct fc_frame *fp,
                  void *arg);
static int bnx2fc_initiate_els(struct bnx2fc_rport *tgt, unsigned int op,
            void *data, u32 data_len,
            void (*cb_func)(struct bnx2fc_els_cb_arg *cb_arg),
            struct bnx2fc_els_cb_arg *cb_arg, u32 timer_msec);

static void bnx2fc_rrq_compl(struct bnx2fc_els_cb_arg *cb_arg)
{
    struct bnx2fc_cmd *orig_io_req;
    struct bnx2fc_cmd *rrq_req;
    int rc = 0;

    BUG_ON(!cb_arg);
    rrq_req = cb_arg->io_req;
    orig_io_req = cb_arg->aborted_io_req;
    BUG_ON(!orig_io_req);
    BNX2FC_ELS_DBG("rrq_compl: orig xid = 0x%x, rrq_xid = 0x%x\n",
           orig_io_req->xid, rrq_req->xid);

    kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);

    if (test_and_clear_bit(BNX2FC_FLAG_ELS_TIMEOUT, &rrq_req->req_flags)) {
        /*
         * els req is timed out. cleanup the IO with FW and
         * drop the completion. Remove from active_cmd_queue.
         */
        BNX2FC_ELS_DBG("rrq xid - 0x%x timed out, clean it up\n",
               rrq_req->xid);

        if (rrq_req->on_active_queue) {
            list_del_init(&rrq_req->link);
            rrq_req->on_active_queue = 0;
            rc = bnx2fc_initiate_cleanup(rrq_req);
            BUG_ON(rc);
        }
    }
    kfree(cb_arg);
}
int bnx2fc_send_rrq(struct bnx2fc_cmd *aborted_io_req)
{

    struct fc_els_rrq rrq;
    struct bnx2fc_rport *tgt = aborted_io_req->tgt;
    struct fc_lport *lport = tgt->rdata->local_port;
    struct bnx2fc_els_cb_arg *cb_arg = NULL;
    u32 sid = tgt->sid;
    u32 r_a_tov = lport->r_a_tov;
    unsigned long start = jiffies;
    int rc;

    BNX2FC_ELS_DBG("Sending RRQ orig_xid = 0x%x\n",
           aborted_io_req->xid);
    memset(&rrq, 0, sizeof(rrq));

    cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_NOIO);
    if (!cb_arg) {
        printk(KERN_ERR PFX "Unable to allocate cb_arg for RRQ\n");
        rc = -ENOMEM;
        goto rrq_err;
    }

    cb_arg->aborted_io_req = aborted_io_req;

    rrq.rrq_cmd = ELS_RRQ;
    hton24(rrq.rrq_s_id, sid);
    rrq.rrq_ox_id = htons(aborted_io_req->xid);
    rrq.rrq_rx_id = htons(aborted_io_req->task->rxwr_txrd.var_ctx.rx_id);

retry_rrq:
    rc = bnx2fc_initiate_els(tgt, ELS_RRQ, &rrq, sizeof(rrq),
                 bnx2fc_rrq_compl, cb_arg,
                 r_a_tov);
    if (rc == -ENOMEM) {
        if (time_after(jiffies, start + (10 * HZ))) {
            BNX2FC_ELS_DBG("rrq Failed\n");
            rc = FAILED;
            goto rrq_err;
        }
        msleep(20);
        goto retry_rrq;
    }
rrq_err:
    if (rc) {
        BNX2FC_ELS_DBG("RRQ failed - release orig io req 0x%x\n",
            aborted_io_req->xid);
        kfree(cb_arg);
        spin_lock_bh(&tgt->tgt_lock);
        kref_put(&aborted_io_req->refcount, bnx2fc_cmd_release);
        spin_unlock_bh(&tgt->tgt_lock);
    }
    return rc;
}

static void bnx2fc_l2_els_compl(struct bnx2fc_els_cb_arg *cb_arg)
{
    struct bnx2fc_cmd *els_req;
    struct bnx2fc_rport *tgt;
    struct bnx2fc_mp_req *mp_req;
    struct fc_frame_header *fc_hdr;
    unsigned char *buf;
    void *resp_buf;
    u32 resp_len, hdr_len;
    u16 l2_oxid;
    int frame_len;
    int rc = 0;

    l2_oxid = cb_arg->l2_oxid;
    BNX2FC_ELS_DBG("ELS COMPL - l2_oxid = 0x%x\n", l2_oxid);

    els_req = cb_arg->io_req;
    if (test_and_clear_bit(BNX2FC_FLAG_ELS_TIMEOUT, &els_req->req_flags)) {
        /*
         * els req is timed out. cleanup the IO with FW and
         * drop the completion. libfc will handle the els timeout
         */
        if (els_req->on_active_queue) {
            list_del_init(&els_req->link);
            els_req->on_active_queue = 0;
            rc = bnx2fc_initiate_cleanup(els_req);
            BUG_ON(rc);
        }
        goto free_arg;
    }

    tgt = els_req->tgt;
    mp_req = &(els_req->mp_req);
    fc_hdr = &(mp_req->resp_fc_hdr);
    resp_len = mp_req->resp_len;
    resp_buf = mp_req->resp_buf;

    buf = kzalloc(PAGE_SIZE, GFP_ATOMIC);
    if (!buf) {
        printk(KERN_ERR PFX "Unable to alloc mp buf\n");
        goto free_arg;
    }
    hdr_len = sizeof(*fc_hdr);
    if (hdr_len + resp_len > PAGE_SIZE) {
        printk(KERN_ERR PFX "l2_els_compl: resp len is "
                    "beyond page size\n");
        goto free_buf;
    }
    memcpy(buf, fc_hdr, hdr_len);
    memcpy(buf + hdr_len, resp_buf, resp_len);
    frame_len = hdr_len + resp_len;

    bnx2fc_process_l2_frame_compl(tgt, buf, frame_len, l2_oxid);

free_buf:
    kfree(buf);
free_arg:
    kfree(cb_arg);
}

int bnx2fc_send_adisc(struct bnx2fc_rport *tgt, struct fc_frame *fp)
{
    struct fc_els_adisc *adisc;
    struct fc_frame_header *fh;
    struct bnx2fc_els_cb_arg *cb_arg;
    struct fc_lport *lport = tgt->rdata->local_port;
    u32 r_a_tov = lport->r_a_tov;
    int rc;

    fh = fc_frame_header_get(fp);
    cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
    if (!cb_arg) {
        printk(KERN_ERR PFX "Unable to allocate cb_arg for ADISC\n");
        return -ENOMEM;
    }

    cb_arg->l2_oxid = ntohs(fh->fh_ox_id);

    BNX2FC_ELS_DBG("send ADISC: l2_oxid = 0x%x\n", cb_arg->l2_oxid);
    adisc = fc_frame_payload_get(fp, sizeof(*adisc));
    /* adisc is initialized by libfc */
    rc = bnx2fc_initiate_els(tgt, ELS_ADISC, adisc, sizeof(*adisc),
                 bnx2fc_l2_els_compl, cb_arg, 2 * r_a_tov);
    if (rc)
        kfree(cb_arg);
    return rc;
}

int bnx2fc_send_logo(struct bnx2fc_rport *tgt, struct fc_frame *fp)
{
    struct fc_els_logo *logo;
    struct fc_frame_header *fh;
    struct bnx2fc_els_cb_arg *cb_arg;
    struct fc_lport *lport = tgt->rdata->local_port;
    u32 r_a_tov = lport->r_a_tov;
    int rc;

    fh = fc_frame_header_get(fp);
    cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
    if (!cb_arg) {
        printk(KERN_ERR PFX "Unable to allocate cb_arg for LOGO\n");
        return -ENOMEM;
    }

    cb_arg->l2_oxid = ntohs(fh->fh_ox_id);

    BNX2FC_ELS_DBG("Send LOGO: l2_oxid = 0x%x\n", cb_arg->l2_oxid);
    logo = fc_frame_payload_get(fp, sizeof(*logo));
    /* logo is initialized by libfc */
    rc = bnx2fc_initiate_els(tgt, ELS_LOGO, logo, sizeof(*logo),
                 bnx2fc_l2_els_compl, cb_arg, 2 * r_a_tov);
    if (rc)
        kfree(cb_arg);
    return rc;
}

int bnx2fc_send_rls(struct bnx2fc_rport *tgt, struct fc_frame *fp)
{
    struct fc_els_rls *rls;
    struct fc_frame_header *fh;
    struct bnx2fc_els_cb_arg *cb_arg;
    struct fc_lport *lport = tgt->rdata->local_port;
    u32 r_a_tov = lport->r_a_tov;
    int rc;

    fh = fc_frame_header_get(fp);
    cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
    if (!cb_arg) {
        printk(KERN_ERR PFX "Unable to allocate cb_arg for LOGO\n");
        return -ENOMEM;
    }

    cb_arg->l2_oxid = ntohs(fh->fh_ox_id);

    rls = fc_frame_payload_get(fp, sizeof(*rls));
    /* rls is initialized by libfc */
    rc = bnx2fc_initiate_els(tgt, ELS_RLS, rls, sizeof(*rls),
                  bnx2fc_l2_els_compl, cb_arg, 2 * r_a_tov);
    if (rc)
        kfree(cb_arg);
    return rc;
}

void bnx2fc_srr_compl(struct bnx2fc_els_cb_arg *cb_arg)
{
    struct bnx2fc_mp_req *mp_req;
    struct fc_frame_header *fc_hdr, *fh;
    struct bnx2fc_cmd *srr_req;
    struct bnx2fc_cmd *orig_io_req;
    struct fc_frame *fp;
    unsigned char *buf;
    void *resp_buf;
    u32 resp_len, hdr_len;
    u8 opcode;
    int rc = 0;

    orig_io_req = cb_arg->aborted_io_req;
    srr_req = cb_arg->io_req;
    if (test_and_clear_bit(BNX2FC_FLAG_ELS_TIMEOUT, &srr_req->req_flags)) {
        /* SRR timedout */
        BNX2FC_IO_DBG(srr_req, "srr timed out, abort "
               "orig_io - 0x%x\n",
            orig_io_req->xid);
        rc = bnx2fc_initiate_abts(srr_req);
        if (rc != SUCCESS) {
            BNX2FC_IO_DBG(srr_req, "srr_compl: initiate_abts "
                "failed. issue cleanup\n");
            bnx2fc_initiate_cleanup(srr_req);
        }
        if (test_bit(BNX2FC_FLAG_IO_COMPL, &orig_io_req->req_flags) ||
            test_bit(BNX2FC_FLAG_ISSUE_ABTS, &orig_io_req->req_flags)) {
            BNX2FC_IO_DBG(srr_req, "srr_compl:xid 0x%x flags = %lx",
                      orig_io_req->xid, orig_io_req->req_flags);
            goto srr_compl_done;
        }
        orig_io_req->srr_retry++;
        if (orig_io_req->srr_retry <= SRR_RETRY_COUNT) {
            struct bnx2fc_rport *tgt = orig_io_req->tgt;
            spin_unlock_bh(&tgt->tgt_lock);
            rc = bnx2fc_send_srr(orig_io_req,
                         orig_io_req->srr_offset,
                         orig_io_req->srr_rctl);
            spin_lock_bh(&tgt->tgt_lock);
            if (!rc)
                goto srr_compl_done;
        }

        rc = bnx2fc_initiate_abts(orig_io_req);
        if (rc != SUCCESS) {
            BNX2FC_IO_DBG(srr_req, "srr_compl: initiate_abts "
                "failed xid = 0x%x. issue cleanup\n",
                orig_io_req->xid);
            bnx2fc_initiate_cleanup(orig_io_req);
        }
        goto srr_compl_done;
    }
    if (test_bit(BNX2FC_FLAG_IO_COMPL, &orig_io_req->req_flags) ||
        test_bit(BNX2FC_FLAG_ISSUE_ABTS, &orig_io_req->req_flags)) {
        BNX2FC_IO_DBG(srr_req, "srr_compl:xid - 0x%x flags = %lx",
                  orig_io_req->xid, orig_io_req->req_flags);
        goto srr_compl_done;
    }
    mp_req = &(srr_req->mp_req);
    fc_hdr = &(mp_req->resp_fc_hdr);
    resp_len = mp_req->resp_len;
    resp_buf = mp_req->resp_buf;

    hdr_len = sizeof(*fc_hdr);
    buf = kzalloc(PAGE_SIZE, GFP_ATOMIC);
    if (!buf) {
        printk(KERN_ERR PFX "srr buf: mem alloc failure\n");
        goto srr_compl_done;
    }
    memcpy(buf, fc_hdr, hdr_len);
    memcpy(buf + hdr_len, resp_buf, resp_len);

    fp = fc_frame_alloc(NULL, resp_len);
    if (!fp) {
        printk(KERN_ERR PFX "fc_frame_alloc failure\n");
        goto free_buf;
    }

    fh = (struct fc_frame_header *) fc_frame_header_get(fp);
    /* Copy FC Frame header and payload into the frame */
    memcpy(fh, buf, hdr_len + resp_len);

    opcode = fc_frame_payload_op(fp);
    switch (opcode) {
    case ELS_LS_ACC:
        BNX2FC_IO_DBG(srr_req, "SRR success\n");
        break;
    case ELS_LS_RJT:
        BNX2FC_IO_DBG(srr_req, "SRR rejected\n");
        rc = bnx2fc_initiate_abts(orig_io_req);
        if (rc != SUCCESS) {
            BNX2FC_IO_DBG(srr_req, "srr_compl: initiate_abts "
                "failed xid = 0x%x. issue cleanup\n",
                orig_io_req->xid);
            bnx2fc_initiate_cleanup(orig_io_req);
        }
        break;
    default:
        BNX2FC_IO_DBG(srr_req, "srr compl - invalid opcode = %d\n",
            opcode);
        break;
    }
    fc_frame_free(fp);
free_buf:
    kfree(buf);
srr_compl_done:
    kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
}

void bnx2fc_rec_compl(struct bnx2fc_els_cb_arg *cb_arg)
{
    struct bnx2fc_cmd *orig_io_req, *new_io_req;
    struct bnx2fc_cmd *rec_req;
    struct bnx2fc_mp_req *mp_req;
    struct fc_frame_header *fc_hdr, *fh;
    struct fc_els_ls_rjt *rjt;
    struct fc_els_rec_acc *acc;
    struct bnx2fc_rport *tgt;
    struct fcoe_err_report_entry *err_entry;
    struct scsi_cmnd *sc_cmd;
    enum fc_rctl r_ctl;
    unsigned char *buf;
    void *resp_buf;
    struct fc_frame *fp;
    u8 opcode;
    u32 offset;
    u32 e_stat;
    u32 resp_len, hdr_len;
    int rc = 0;
    bool send_seq_clnp = false;
    bool abort_io = false;

    BNX2FC_MISC_DBG("Entered rec_compl callback\n");
    rec_req = cb_arg->io_req;
    orig_io_req = cb_arg->aborted_io_req;
    BNX2FC_IO_DBG(rec_req, "rec_compl: orig xid = 0x%x", orig_io_req->xid);
    tgt = orig_io_req->tgt;

    /* Handle REC timeout case */
    if (test_and_clear_bit(BNX2FC_FLAG_ELS_TIMEOUT, &rec_req->req_flags)) {
        BNX2FC_IO_DBG(rec_req, "timed out, abort "
               "orig_io - 0x%x\n",
            orig_io_req->xid);
        /* els req is timed out. send abts for els */
        rc = bnx2fc_initiate_abts(rec_req);
        if (rc != SUCCESS) {
            BNX2FC_IO_DBG(rec_req, "rec_compl: initiate_abts "
                "failed. issue cleanup\n");
            bnx2fc_initiate_cleanup(rec_req);
        }
        orig_io_req->rec_retry++;
        /* REC timedout. send ABTS to the orig IO req */
        if (orig_io_req->rec_retry <= REC_RETRY_COUNT) {
            spin_unlock_bh(&tgt->tgt_lock);
            rc = bnx2fc_send_rec(orig_io_req);
            spin_lock_bh(&tgt->tgt_lock);
            if (!rc)
                goto rec_compl_done;
        }
        rc = bnx2fc_initiate_abts(orig_io_req);
        if (rc != SUCCESS) {
            BNX2FC_IO_DBG(rec_req, "rec_compl: initiate_abts "
                "failed xid = 0x%x. issue cleanup\n",
                orig_io_req->xid);
            bnx2fc_initiate_cleanup(orig_io_req);
        }
        goto rec_compl_done;
    }

    if (test_bit(BNX2FC_FLAG_IO_COMPL, &orig_io_req->req_flags)) {
        BNX2FC_IO_DBG(rec_req, "completed"
               "orig_io - 0x%x\n",
            orig_io_req->xid);
        goto rec_compl_done;
    }
    if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &orig_io_req->req_flags)) {
        BNX2FC_IO_DBG(rec_req, "abts in prog "
               "orig_io - 0x%x\n",
            orig_io_req->xid);
        goto rec_compl_done;
    }

    mp_req = &(rec_req->mp_req);
    fc_hdr = &(mp_req->resp_fc_hdr);
    resp_len = mp_req->resp_len;
    acc = resp_buf = mp_req->resp_buf;

    hdr_len = sizeof(*fc_hdr);

    buf = kzalloc(PAGE_SIZE, GFP_ATOMIC);
    if (!buf) {
        printk(KERN_ERR PFX "rec buf: mem alloc failure\n");
        goto rec_compl_done;
    }
    memcpy(buf, fc_hdr, hdr_len);
    memcpy(buf + hdr_len, resp_buf, resp_len);

    fp = fc_frame_alloc(NULL, resp_len);
    if (!fp) {
        printk(KERN_ERR PFX "fc_frame_alloc failure\n");
        goto free_buf;
    }

    fh = (struct fc_frame_header *) fc_frame_header_get(fp);
    /* Copy FC Frame header and payload into the frame */
    memcpy(fh, buf, hdr_len + resp_len);

    opcode = fc_frame_payload_op(fp);
    if (opcode == ELS_LS_RJT) {
        BNX2FC_IO_DBG(rec_req, "opcode is RJT\n");
        rjt = fc_frame_payload_get(fp, sizeof(*rjt));
        if ((rjt->er_reason == ELS_RJT_LOGIC ||
            rjt->er_reason == ELS_RJT_UNAB) &&
            rjt->er_explan == ELS_EXPL_OXID_RXID) {
            BNX2FC_IO_DBG(rec_req, "handle CMD LOST case\n");
            new_io_req = bnx2fc_cmd_alloc(tgt);
            if (!new_io_req)
                goto abort_io;
            new_io_req->sc_cmd = orig_io_req->sc_cmd;
            /* cleanup orig_io_req that is with the FW */
            set_bit(BNX2FC_FLAG_CMD_LOST,
                &orig_io_req->req_flags);
            bnx2fc_initiate_cleanup(orig_io_req);
            /* Post a new IO req with the same sc_cmd */
            BNX2FC_IO_DBG(rec_req, "Post IO request again\n");
            spin_unlock_bh(&tgt->tgt_lock);
            rc = bnx2fc_post_io_req(tgt, new_io_req);
            spin_lock_bh(&tgt->tgt_lock);
            if (!rc)
                goto free_frame;
            BNX2FC_IO_DBG(rec_req, "REC: io post err\n");
        }
abort_io:
        rc = bnx2fc_initiate_abts(orig_io_req);
        if (rc != SUCCESS) {
            BNX2FC_IO_DBG(rec_req, "rec_compl: initiate_abts "
                "failed. issue cleanup\n");
            bnx2fc_initiate_cleanup(orig_io_req);
        }
    } else if (opcode == ELS_LS_ACC) {
        /* REVISIT: Check if the exchange is already aborted */
        offset = ntohl(acc->reca_fc4value);
        e_stat = ntohl(acc->reca_e_stat);
        if (e_stat & ESB_ST_SEQ_INIT)  {
            BNX2FC_IO_DBG(rec_req, "target has the seq init\n");
            goto free_frame;
        }
        BNX2FC_IO_DBG(rec_req, "e_stat = 0x%x, offset = 0x%x\n",
            e_stat, offset);
        /* Seq initiative is with us */
        err_entry = (struct fcoe_err_report_entry *)
                 &orig_io_req->err_entry;
        sc_cmd = orig_io_req->sc_cmd;
        if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
            /* SCSI WRITE command */
            if (offset == orig_io_req->data_xfer_len) {
                BNX2FC_IO_DBG(rec_req, "WRITE - resp lost\n");
                /* FCP_RSP lost */
                r_ctl = FC_RCTL_DD_CMD_STATUS;
                offset = 0;
            } else  {
                /* start transmitting from offset */
                BNX2FC_IO_DBG(rec_req, "XFER_RDY/DATA lost\n");
                send_seq_clnp = true;
                r_ctl = FC_RCTL_DD_DATA_DESC;
                if (bnx2fc_initiate_seq_cleanup(orig_io_req,
                                offset, r_ctl))
                    abort_io = true;
                /* XFER_RDY */
            }
        } else {
            /* SCSI READ command */
            if (err_entry->data.rx_buf_off ==
                    orig_io_req->data_xfer_len) {
                /* FCP_RSP lost */
                BNX2FC_IO_DBG(rec_req, "READ - resp lost\n");
                r_ctl = FC_RCTL_DD_CMD_STATUS;
                offset = 0;
            } else  {
                /* request retransmission from this offset */
                send_seq_clnp = true;
                offset = err_entry->data.rx_buf_off;
                BNX2FC_IO_DBG(rec_req, "RD DATA lost\n");
                /* FCP_DATA lost */
                r_ctl = FC_RCTL_DD_SOL_DATA;
                if (bnx2fc_initiate_seq_cleanup(orig_io_req,
                                offset, r_ctl))
                    abort_io = true;
            }
        }
        if (abort_io) {
            rc = bnx2fc_initiate_abts(orig_io_req);
            if (rc != SUCCESS) {
                BNX2FC_IO_DBG(rec_req, "rec_compl:initiate_abts"
                          " failed. issue cleanup\n");
                bnx2fc_initiate_cleanup(orig_io_req);
            }
        } else if (!send_seq_clnp) {
            BNX2FC_IO_DBG(rec_req, "Send SRR - FCP_RSP\n");
            spin_unlock_bh(&tgt->tgt_lock);
            rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
            spin_lock_bh(&tgt->tgt_lock);

            if (rc) {
                BNX2FC_IO_DBG(rec_req, "Unable to send SRR"
                    " IO will abort\n");
            }
        }
    }
free_frame:
    fc_frame_free(fp);
free_buf:
    kfree(buf);
rec_compl_done:
    kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
    kfree(cb_arg);
}

int bnx2fc_send_rec(struct bnx2fc_cmd *orig_io_req)
{
    struct fc_els_rec rec;
    struct bnx2fc_rport *tgt = orig_io_req->tgt;
    struct fc_lport *lport = tgt->rdata->local_port;
    struct bnx2fc_els_cb_arg *cb_arg = NULL;
    u32 sid = tgt->sid;
    u32 r_a_tov = lport->r_a_tov;
    int rc;

    BNX2FC_IO_DBG(orig_io_req, "Sending REC\n");
    memset(&rec, 0, sizeof(rec));

    cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
    if (!cb_arg) {
        printk(KERN_ERR PFX "Unable to allocate cb_arg for REC\n");
        rc = -ENOMEM;
        goto rec_err;
    }
    kref_get(&orig_io_req->refcount);

    cb_arg->aborted_io_req = orig_io_req;

    rec.rec_cmd = ELS_REC;
    hton24(rec.rec_s_id, sid);
    rec.rec_ox_id = htons(orig_io_req->xid);
    rec.rec_rx_id = htons(orig_io_req->task->rxwr_txrd.var_ctx.rx_id);

    rc = bnx2fc_initiate_els(tgt, ELS_REC, &rec, sizeof(rec),
                 bnx2fc_rec_compl, cb_arg,
                 r_a_tov);
rec_err:
    if (rc) {
        BNX2FC_IO_DBG(orig_io_req, "REC failed - release\n");
        spin_lock_bh(&tgt->tgt_lock);
        kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
        spin_unlock_bh(&tgt->tgt_lock);
        kfree(cb_arg);
    }
    return rc;
}

int bnx2fc_send_srr(struct bnx2fc_cmd *orig_io_req, u32 offset, u8 r_ctl)
{
    struct fcp_srr srr;
    struct bnx2fc_rport *tgt = orig_io_req->tgt;
    struct fc_lport *lport = tgt->rdata->local_port;
    struct bnx2fc_els_cb_arg *cb_arg = NULL;
    u32 r_a_tov = lport->r_a_tov;
    int rc;

    BNX2FC_IO_DBG(orig_io_req, "Sending SRR\n");
    memset(&srr, 0, sizeof(srr));

    cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
    if (!cb_arg) {
        printk(KERN_ERR PFX "Unable to allocate cb_arg for SRR\n");
        rc = -ENOMEM;
        goto srr_err;
    }
    kref_get(&orig_io_req->refcount);

    cb_arg->aborted_io_req = orig_io_req;

    srr.srr_op = ELS_SRR;
    srr.srr_ox_id = htons(orig_io_req->xid);
    srr.srr_rx_id = htons(orig_io_req->task->rxwr_txrd.var_ctx.rx_id);
    srr.srr_rel_off = htonl(offset);
    srr.srr_r_ctl = r_ctl;
    orig_io_req->srr_offset = offset;
    orig_io_req->srr_rctl = r_ctl;

    rc = bnx2fc_initiate_els(tgt, ELS_SRR, &srr, sizeof(srr),
                 bnx2fc_srr_compl, cb_arg,
                 r_a_tov);
srr_err:
    if (rc) {
        BNX2FC_IO_DBG(orig_io_req, "SRR failed - release\n");
        spin_lock_bh(&tgt->tgt_lock);
        kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
        spin_unlock_bh(&tgt->tgt_lock);
        kfree(cb_arg);
    } else
        set_bit(BNX2FC_FLAG_SRR_SENT, &orig_io_req->req_flags);

    return rc;
}

static int bnx2fc_initiate_els(struct bnx2fc_rport *tgt, unsigned int op,
            void *data, u32 data_len,
            void (*cb_func)(struct bnx2fc_els_cb_arg *cb_arg),
            struct bnx2fc_els_cb_arg *cb_arg, u32 timer_msec)
{
    struct fcoe_port *port = tgt->port;
    struct bnx2fc_interface *interface = port->priv;
    struct fc_rport *rport = tgt->rport;
    struct fc_lport *lport = port->lport;
    struct bnx2fc_cmd *els_req;
    struct bnx2fc_mp_req *mp_req;
    struct fc_frame_header *fc_hdr;
    struct fcoe_task_ctx_entry *task;
    struct fcoe_task_ctx_entry *task_page;
    int rc = 0;
    int task_idx, index;
    u32 did, sid;
    u16 xid;

    rc = fc_remote_port_chkready(rport);
    if (rc) {
        printk(KERN_ERR PFX "els 0x%x: rport not ready\n", op);
        rc = -EINVAL;
        goto els_err;
    }
    if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
        printk(KERN_ERR PFX "els 0x%x: link is not ready\n", op);
        rc = -EINVAL;
        goto els_err;
    }
    if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) ||
         (test_bit(BNX2FC_FLAG_EXPL_LOGO, &tgt->flags))) {
        printk(KERN_ERR PFX "els 0x%x: tgt not ready\n", op);
        rc = -EINVAL;
        goto els_err;
    }
    els_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ELS);
    if (!els_req) {
        rc = -ENOMEM;
        goto els_err;
    }

    els_req->sc_cmd = NULL;
    els_req->port = port;
    els_req->tgt = tgt;
    els_req->cb_func = cb_func;
    cb_arg->io_req = els_req;
    els_req->cb_arg = cb_arg;

    mp_req = (struct bnx2fc_mp_req *)&(els_req->mp_req);
    rc = bnx2fc_init_mp_req(els_req);
    if (rc == FAILED) {
        printk(KERN_ERR PFX "ELS MP request init failed\n");
        spin_lock_bh(&tgt->tgt_lock);
        kref_put(&els_req->refcount, bnx2fc_cmd_release);
        spin_unlock_bh(&tgt->tgt_lock);
        rc = -ENOMEM;
        goto els_err;
    } else {
        /* rc SUCCESS */
        rc = 0;
    }

    /* Set the data_xfer_len to the size of ELS payload */
    mp_req->req_len = data_len;
    els_req->data_xfer_len = mp_req->req_len;

    /* Fill ELS Payload */
    if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS)) {
        memcpy(mp_req->req_buf, data, data_len);
    } else {
        printk(KERN_ERR PFX "Invalid ELS op 0x%x\n", op);
        els_req->cb_func = NULL;
        els_req->cb_arg = NULL;
        spin_lock_bh(&tgt->tgt_lock);
        kref_put(&els_req->refcount, bnx2fc_cmd_release);
        spin_unlock_bh(&tgt->tgt_lock);
        rc = -EINVAL;
    }

    if (rc)
        goto els_err;

    /* Fill FC header */
    fc_hdr = &(mp_req->req_fc_hdr);

    did = tgt->rport->port_id;
    sid = tgt->sid;

    if (op == ELS_SRR)
        __fc_fill_fc_hdr(fc_hdr, FC_RCTL_ELS4_REQ, did, sid,
                   FC_TYPE_FCP, FC_FC_FIRST_SEQ |
                   FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
    else
        __fc_fill_fc_hdr(fc_hdr, FC_RCTL_ELS_REQ, did, sid,
                   FC_TYPE_ELS, FC_FC_FIRST_SEQ |
                   FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);

    /* Obtain exchange id */
    xid = els_req->xid;
    task_idx = xid/BNX2FC_TASKS_PER_PAGE;
    index = xid % BNX2FC_TASKS_PER_PAGE;

    /* Initialize task context for this IO request */
    task_page = (struct fcoe_task_ctx_entry *)
            interface->hba->task_ctx[task_idx];
    task = &(task_page[index]);
    bnx2fc_init_mp_task(els_req, task);

    spin_lock_bh(&tgt->tgt_lock);

    if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
        printk(KERN_ERR PFX "initiate_els.. session not ready\n");
        els_req->cb_func = NULL;
        els_req->cb_arg = NULL;
        kref_put(&els_req->refcount, bnx2fc_cmd_release);
        spin_unlock_bh(&tgt->tgt_lock);
        return -EINVAL;
    }

    if (timer_msec)
        bnx2fc_cmd_timer_set(els_req, timer_msec);
    bnx2fc_add_2_sq(tgt, xid);

    els_req->on_active_queue = 1;
    list_add_tail(&els_req->link, &tgt->els_queue);

    /* Ring doorbell */
    bnx2fc_ring_doorbell(tgt);
    spin_unlock_bh(&tgt->tgt_lock);

els_err:
    return rc;
}

void bnx2fc_process_els_compl(struct bnx2fc_cmd *els_req,
                  struct fcoe_task_ctx_entry *task, u8 num_rq)
{
    struct bnx2fc_mp_req *mp_req;
    struct fc_frame_header *fc_hdr;
    u64 *hdr;
    u64 *temp_hdr;

    BNX2FC_ELS_DBG("Entered process_els_compl xid = 0x%x"
            "cmd_type = %d\n", els_req->xid, els_req->cmd_type);

    if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
                 &els_req->req_flags)) {
        BNX2FC_ELS_DBG("Timer context finished processing this "
               "els - 0x%x\n", els_req->xid);
        /* This IO doesn't receive cleanup completion */
        kref_put(&els_req->refcount, bnx2fc_cmd_release);
        return;
    }

    /* Cancel the timeout_work, as we received the response */
    if (cancel_delayed_work(&els_req->timeout_work))
        kref_put(&els_req->refcount,
             bnx2fc_cmd_release); /* drop timer hold */

    if (els_req->on_active_queue) {
        list_del_init(&els_req->link);
        els_req->on_active_queue = 0;
    }

    mp_req = &(els_req->mp_req);
    fc_hdr = &(mp_req->resp_fc_hdr);

    hdr = (u64 *)fc_hdr;
    temp_hdr = (u64 *)
        &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
    hdr[0] = cpu_to_be64(temp_hdr[0]);
    hdr[1] = cpu_to_be64(temp_hdr[1]);
    hdr[2] = cpu_to_be64(temp_hdr[2]);

    mp_req->resp_len =
        task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;

    /* Parse ELS response */
    if ((els_req->cb_func) && (els_req->cb_arg)) {
        els_req->cb_func(els_req->cb_arg);
        els_req->cb_arg = NULL;
    }

    kref_put(&els_req->refcount, bnx2fc_cmd_release);
}

static void bnx2fc_flogi_resp(struct fc_seq *seq, struct fc_frame *fp,
                  void *arg)
{
    struct fcoe_ctlr *fip = arg;
    struct fc_exch *exch = fc_seq_exch(seq);
    struct fc_lport *lport = exch->lp;
    u8 *mac;
    u8 op;

    if (IS_ERR(fp))
        goto done;

    mac = fr_cb(fp)->granted_mac;
    if (is_zero_ether_addr(mac)) {
        op = fc_frame_payload_op(fp);
        if (lport->vport) {
            if (op == ELS_LS_RJT) {
                printk(KERN_ERR PFX "bnx2fc_flogi_resp is LS_RJT\n");
                fc_vport_terminate(lport->vport);
                fc_frame_free(fp);
                return;
            }
        }
        fcoe_ctlr_recv_flogi(fip, lport, fp);
    }
    if (!is_zero_ether_addr(mac))
        fip->update_mac(lport, mac);
done:
    fc_lport_flogi_resp(seq, fp, lport);
}

static void bnx2fc_logo_resp(struct fc_seq *seq, struct fc_frame *fp,
                 void *arg)
{
    struct fcoe_ctlr *fip = arg;
    struct fc_exch *exch = fc_seq_exch(seq);
    struct fc_lport *lport = exch->lp;
    static u8 zero_mac[ETH_ALEN] = { 0 };

    if (!IS_ERR(fp))
        fip->update_mac(lport, zero_mac);
    fc_lport_logo_resp(seq, fp, lport);
}

struct fc_seq *bnx2fc_elsct_send(struct fc_lport *lport, u32 did,
                      struct fc_frame *fp, unsigned int op,
                      void (*resp)(struct fc_seq *,
                           struct fc_frame *,
                           void *),
                      void *arg, u32 timeout)
{
    struct fcoe_port *port = lport_priv(lport);
    struct bnx2fc_interface *interface = port->priv;
    struct fcoe_ctlr *fip = bnx2fc_to_ctlr(interface);
    struct fc_frame_header *fh = fc_frame_header_get(fp);

    switch (op) {
    case ELS_FLOGI:
    case ELS_FDISC:
        return fc_elsct_send(lport, did, fp, op, bnx2fc_flogi_resp,
                     fip, timeout);
    case ELS_LOGO:
        /* only hook onto fabric logouts, not port logouts */
        if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
            break;
        return fc_elsct_send(lport, did, fp, op, bnx2fc_logo_resp,
                     fip, timeout);
    }
    return fc_elsct_send(lport, did, fp, op, resp, arg, timeout);
}