OSCL-LXR linux-6.0.1/​drivers/​scsi/​csiostor/​csio_scsi.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /*
  * This file is part of the Chelsio FCoE driver for Linux.
  *
  * Copyright (c) 2008-2012 Chelsio Communications, Inc. All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
  * General Public License (GPL) Version 2, available from the file
  * COPYING in the main directory of this source tree, or the
  * OpenIB.org BSD license below:
  *
  *     Redistribution and use in source and binary forms, with or
  *     without modification, are permitted provided that the following
  *     conditions are met:
  *
  *      - Redistributions of source code must retain the above
  *        copyright notice, this list of conditions and the following
  *        disclaimer.
  *
  *      - Redistributions in binary form must reproduce the above
  *        copyright notice, this list of conditions and the following
  *        disclaimer in the documentation and/or other materials
  *        provided with the distribution.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
 
 #include <linux/device.h>
 #include <linux/delay.h>
 #include <linux/ctype.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/compiler.h>
 #include <linux/export.h>
 #include <linux/module.h>
 #include <asm/unaligned.h>
 #include <asm/page.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_transport_fc.h>
 
 #include "csio_hw.h"
 #include "csio_lnode.h"
 #include "csio_rnode.h"
 #include "csio_scsi.h"
 #include "csio_init.h"
 
 int csio_scsi_eqsize = 65536;
 int csio_scsi_iqlen = 128;
 int csio_scsi_ioreqs = 2048;
 uint32_t csio_max_scan_tmo;
 uint32_t csio_delta_scan_tmo = 5;
 int csio_lun_qdepth = 32;
 
 static int csio_ddp_descs = 128;
 
 static int csio_do_abrt_cls(struct csio_hw *,
                       struct csio_ioreq *, bool);
 
 static void csio_scsis_uninit(struct csio_ioreq *, enum csio_scsi_ev);
 static void csio_scsis_io_active(struct csio_ioreq *, enum csio_scsi_ev);
 static void csio_scsis_tm_active(struct csio_ioreq *, enum csio_scsi_ev);
 static void csio_scsis_aborting(struct csio_ioreq *, enum csio_scsi_ev);
 static void csio_scsis_closing(struct csio_ioreq *, enum csio_scsi_ev);
 static void csio_scsis_shost_cmpl_await(struct csio_ioreq *, enum csio_scsi_ev);
 
 /*
  * csio_scsi_match_io - Match an ioreq with the given SCSI level data.
  * @ioreq: The I/O request
  * @sld: Level information
  *
  * Should be called with lock held.
  *
  */
 static bool
 csio_scsi_match_io(struct csio_ioreq *ioreq, struct csio_scsi_level_data *sld)
 {
     struct scsi_cmnd *scmnd = csio_scsi_cmnd(ioreq);
 
     switch (sld->level) {
     case CSIO_LEV_LUN:
         if (scmnd == NULL)
             return false;
 
         return ((ioreq->lnode == sld->lnode) &&
             (ioreq->rnode == sld->rnode) &&
             ((uint64_t)scmnd->device->lun == sld->oslun));
 
     case CSIO_LEV_RNODE:
         return ((ioreq->lnode == sld->lnode) &&
                 (ioreq->rnode == sld->rnode));
     case CSIO_LEV_LNODE:
         return (ioreq->lnode == sld->lnode);
     case CSIO_LEV_ALL:
         return true;
     default:
         return false;
     }
 }
 
 /*
  * csio_scsi_gather_active_ios - Gather active I/Os based on level
  * @scm: SCSI module
  * @sld: Level information
  * @dest: The queue where these I/Os have to be gathered.
  *
  * Should be called with lock held.
  */
 static void
 csio_scsi_gather_active_ios(struct csio_scsim *scm,
                 struct csio_scsi_level_data *sld,
                 struct list_head *dest)
 {
     struct list_head *tmp, *next;
 
     if (list_empty(&scm->active_q))
         return;
 
     /* Just splice the entire active_q into dest */
     if (sld->level == CSIO_LEV_ALL) {
         list_splice_tail_init(&scm->active_q, dest);
         return;
     }
 
     list_for_each_safe(tmp, next, &scm->active_q) {
         if (csio_scsi_match_io((struct csio_ioreq *)tmp, sld)) {
             list_del_init(tmp);
             list_add_tail(tmp, dest);
         }
     }
 }
 
 static inline bool
 csio_scsi_itnexus_loss_error(uint16_t error)
 {
     switch (error) {
     case FW_ERR_LINK_DOWN:
     case FW_RDEV_NOT_READY:
     case FW_ERR_RDEV_LOST:
     case FW_ERR_RDEV_LOGO:
     case FW_ERR_RDEV_IMPL_LOGO:
         return true;
     }
     return false;
 }
 
 /*
  * csio_scsi_fcp_cmnd - Frame the SCSI FCP command paylod.
  * @req: IO req structure.
  * @addr: DMA location to place the payload.
  *
  * This routine is shared between FCP_WRITE, FCP_READ and FCP_CMD requests.
  */
 static inline void
 csio_scsi_fcp_cmnd(struct csio_ioreq *req, void *addr)
 {
     struct fcp_cmnd *fcp_cmnd = (struct fcp_cmnd *)addr;
     struct scsi_cmnd *scmnd = csio_scsi_cmnd(req);
 
     /* Check for Task Management */
     if (likely(csio_priv(scmnd)->fc_tm_flags == 0)) {
         int_to_scsilun(scmnd->device->lun, &fcp_cmnd->fc_lun);
         fcp_cmnd->fc_tm_flags = 0;
         fcp_cmnd->fc_cmdref = 0;
 
         memcpy(fcp_cmnd->fc_cdb, scmnd->cmnd, 16);
         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
         fcp_cmnd->fc_dl = cpu_to_be32(scsi_bufflen(scmnd));
 
         if (req->nsge)
             if (req->datadir == DMA_TO_DEVICE)
                 fcp_cmnd->fc_flags = FCP_CFL_WRDATA;
             else
                 fcp_cmnd->fc_flags = FCP_CFL_RDDATA;
         else
             fcp_cmnd->fc_flags = 0;
     } else {
         memset(fcp_cmnd, 0, sizeof(*fcp_cmnd));
         int_to_scsilun(scmnd->device->lun, &fcp_cmnd->fc_lun);
         fcp_cmnd->fc_tm_flags = csio_priv(scmnd)->fc_tm_flags;
     }
 }
 
 /*
  * csio_scsi_init_cmd_wr - Initialize the SCSI CMD WR.
  * @req: IO req structure.
  * @addr: DMA location to place the payload.
  * @size: Size of WR (including FW WR + immed data + rsp SG entry
  *
  * Wrapper for populating fw_scsi_cmd_wr.
  */
 static inline void
 csio_scsi_init_cmd_wr(struct csio_ioreq *req, void *addr, uint32_t size)
 {
     struct csio_hw *hw = req->lnode->hwp;
     struct csio_rnode *rn = req->rnode;
     struct fw_scsi_cmd_wr *wr = (struct fw_scsi_cmd_wr *)addr;
     struct csio_dma_buf *dma_buf;
     uint8_t imm = csio_hw_to_scsim(hw)->proto_cmd_len;
 
     wr->op_immdlen = cpu_to_be32(FW_WR_OP_V(FW_SCSI_CMD_WR) |
                       FW_SCSI_CMD_WR_IMMDLEN(imm));
     wr->flowid_len16 = cpu_to_be32(FW_WR_FLOWID_V(rn->flowid) |
                         FW_WR_LEN16_V(
                         DIV_ROUND_UP(size, 16)));
 
     wr->cookie = (uintptr_t) req;
     wr->iqid = cpu_to_be16(csio_q_physiqid(hw, req->iq_idx));
     wr->tmo_val = (uint8_t) req->tmo;
     wr->r3 = 0;
     memset(&wr->r5, 0, 8);
 
     /* Get RSP DMA buffer */
     dma_buf = &req->dma_buf;
 
     /* Prepare RSP SGL */
     wr->rsp_dmalen = cpu_to_be32(dma_buf->len);
     wr->rsp_dmaaddr = cpu_to_be64(dma_buf->paddr);
 
     wr->r6 = 0;
 
     wr->u.fcoe.ctl_pri = 0;
     wr->u.fcoe.cp_en_class = 0;
     wr->u.fcoe.r4_lo[0] = 0;
     wr->u.fcoe.r4_lo[1] = 0;
 
     /* Frame a FCP command */
     csio_scsi_fcp_cmnd(req, (void *)((uintptr_t)addr +
                     sizeof(struct fw_scsi_cmd_wr)));
 }
 
 #define CSIO_SCSI_CMD_WR_SZ(_imm)                   \
     (sizeof(struct fw_scsi_cmd_wr) +        /* WR size */   \
      ALIGN((_imm), 16))             /* Immed data */
 
 #define CSIO_SCSI_CMD_WR_SZ_16(_imm)                    \
             (ALIGN(CSIO_SCSI_CMD_WR_SZ((_imm)), 16))
 
 /*
  * csio_scsi_cmd - Create a SCSI CMD WR.
  * @req: IO req structure.
  *
  * Gets a WR slot in the ingress queue and initializes it with SCSI CMD WR.
  *
  */
 static inline void
 csio_scsi_cmd(struct csio_ioreq *req)
 {
     struct csio_wr_pair wrp;
     struct csio_hw *hw = req->lnode->hwp;
     struct csio_scsim *scsim = csio_hw_to_scsim(hw);
     uint32_t size = CSIO_SCSI_CMD_WR_SZ_16(scsim->proto_cmd_len);
 
     req->drv_status = csio_wr_get(hw, req->eq_idx, size, &wrp);
     if (unlikely(req->drv_status != 0))
         return;
 
     if (wrp.size1 >= size) {
         /* Initialize WR in one shot */
         csio_scsi_init_cmd_wr(req, wrp.addr1, size);
     } else {
         uint8_t *tmpwr = csio_q_eq_wrap(hw, req->eq_idx);
 
         /*
          * Make a temporary copy of the WR and write back
          * the copy into the WR pair.
          */
         csio_scsi_init_cmd_wr(req, (void *)tmpwr, size);
         memcpy(wrp.addr1, tmpwr, wrp.size1);
         memcpy(wrp.addr2, tmpwr + wrp.size1, size - wrp.size1);
     }
 }
 
 /*
  * csio_scsi_init_ulptx_dsgl - Fill in a ULP_TX_SC_DSGL
  * @hw: HW module
  * @req: IO request
  * @sgl: ULP TX SGL pointer.
  *
  */
 static inline void
 csio_scsi_init_ultptx_dsgl(struct csio_hw *hw, struct csio_ioreq *req,
                struct ulptx_sgl *sgl)
 {
     struct ulptx_sge_pair *sge_pair = NULL;
     struct scatterlist *sgel;
     uint32_t i = 0;
     uint32_t xfer_len;
     struct list_head *tmp;
     struct csio_dma_buf *dma_buf;
     struct scsi_cmnd *scmnd = csio_scsi_cmnd(req);
 
     sgl->cmd_nsge = htonl(ULPTX_CMD_V(ULP_TX_SC_DSGL) | ULPTX_MORE_F |
                      ULPTX_NSGE_V(req->nsge));
     /* Now add the data SGLs */
     if (likely(!req->dcopy)) {
         scsi_for_each_sg(scmnd, sgel, req->nsge, i) {
             if (i == 0) {
                 sgl->addr0 = cpu_to_be64(sg_dma_address(sgel));
                 sgl->len0 = cpu_to_be32(sg_dma_len(sgel));
                 sge_pair = (struct ulptx_sge_pair *)(sgl + 1);
                 continue;
             }
             if ((i - 1) & 0x1) {
                 sge_pair->addr[1] = cpu_to_be64(
                             sg_dma_address(sgel));
                 sge_pair->len[1] = cpu_to_be32(
                             sg_dma_len(sgel));
                 sge_pair++;
             } else {
                 sge_pair->addr[0] = cpu_to_be64(
                             sg_dma_address(sgel));
                 sge_pair->len[0] = cpu_to_be32(
                             sg_dma_len(sgel));
             }
         }
     } else {
         /* Program sg elements with driver's DDP buffer */
         xfer_len = scsi_bufflen(scmnd);
         list_for_each(tmp, &req->gen_list) {
             dma_buf = (struct csio_dma_buf *)tmp;
             if (i == 0) {
                 sgl->addr0 = cpu_to_be64(dma_buf->paddr);
                 sgl->len0 = cpu_to_be32(
                         min(xfer_len, dma_buf->len));
                 sge_pair = (struct ulptx_sge_pair *)(sgl + 1);
             } else if ((i - 1) & 0x1) {
                 sge_pair->addr[1] = cpu_to_be64(dma_buf->paddr);
                 sge_pair->len[1] = cpu_to_be32(
                         min(xfer_len, dma_buf->len));
                 sge_pair++;
             } else {
                 sge_pair->addr[0] = cpu_to_be64(dma_buf->paddr);
                 sge_pair->len[0] = cpu_to_be32(
                         min(xfer_len, dma_buf->len));
             }
             xfer_len -= min(xfer_len, dma_buf->len);
             i++;
         }
     }
 }
 
 /*
  * csio_scsi_init_read_wr - Initialize the READ SCSI WR.
  * @req: IO req structure.
  * @wrp: DMA location to place the payload.
  * @size: Size of WR (including FW WR + immed data + rsp SG entry + data SGL
  *
  * Wrapper for populating fw_scsi_read_wr.
  */
 static inline void
 csio_scsi_init_read_wr(struct csio_ioreq *req, void *wrp, uint32_t size)
 {
     struct csio_hw *hw = req->lnode->hwp;
     struct csio_rnode *rn = req->rnode;
     struct fw_scsi_read_wr *wr = (struct fw_scsi_read_wr *)wrp;
     struct ulptx_sgl *sgl;
     struct csio_dma_buf *dma_buf;
     uint8_t imm = csio_hw_to_scsim(hw)->proto_cmd_len;
     struct scsi_cmnd *scmnd = csio_scsi_cmnd(req);
 
     wr->op_immdlen = cpu_to_be32(FW_WR_OP_V(FW_SCSI_READ_WR) |
                      FW_SCSI_READ_WR_IMMDLEN(imm));
     wr->flowid_len16 = cpu_to_be32(FW_WR_FLOWID_V(rn->flowid) |
                        FW_WR_LEN16_V(DIV_ROUND_UP(size, 16)));
     wr->cookie = (uintptr_t)req;
     wr->iqid = cpu_to_be16(csio_q_physiqid(hw, req->iq_idx));
     wr->tmo_val = (uint8_t)(req->tmo);
     wr->use_xfer_cnt = 1;
     wr->xfer_cnt = cpu_to_be32(scsi_bufflen(scmnd));
     wr->ini_xfer_cnt = cpu_to_be32(scsi_bufflen(scmnd));
     /* Get RSP DMA buffer */
     dma_buf = &req->dma_buf;
 
     /* Prepare RSP SGL */
     wr->rsp_dmalen = cpu_to_be32(dma_buf->len);
     wr->rsp_dmaaddr = cpu_to_be64(dma_buf->paddr);
 
     wr->r4 = 0;
 
     wr->u.fcoe.ctl_pri = 0;
     wr->u.fcoe.cp_en_class = 0;
     wr->u.fcoe.r3_lo[0] = 0;
     wr->u.fcoe.r3_lo[1] = 0;
     csio_scsi_fcp_cmnd(req, (void *)((uintptr_t)wrp +
                     sizeof(struct fw_scsi_read_wr)));
 
     /* Move WR pointer past command and immediate data */
     sgl = (struct ulptx_sgl *)((uintptr_t)wrp +
                   sizeof(struct fw_scsi_read_wr) + ALIGN(imm, 16));
 
     /* Fill in the DSGL */
     csio_scsi_init_ultptx_dsgl(hw, req, sgl);
 }
 
 /*
  * csio_scsi_init_write_wr - Initialize the WRITE SCSI WR.
  * @req: IO req structure.
  * @wrp: DMA location to place the payload.
  * @size: Size of WR (including FW WR + immed data + rsp SG entry + data SGL
  *
  * Wrapper for populating fw_scsi_write_wr.
  */
 static inline void
 csio_scsi_init_write_wr(struct csio_ioreq *req, void *wrp, uint32_t size)
 {
     struct csio_hw *hw = req->lnode->hwp;
     struct csio_rnode *rn = req->rnode;
     struct fw_scsi_write_wr *wr = (struct fw_scsi_write_wr *)wrp;
     struct ulptx_sgl *sgl;
     struct csio_dma_buf *dma_buf;
     uint8_t imm = csio_hw_to_scsim(hw)->proto_cmd_len;
     struct scsi_cmnd *scmnd = csio_scsi_cmnd(req);
 
     wr->op_immdlen = cpu_to_be32(FW_WR_OP_V(FW_SCSI_WRITE_WR) |
                      FW_SCSI_WRITE_WR_IMMDLEN(imm));
     wr->flowid_len16 = cpu_to_be32(FW_WR_FLOWID_V(rn->flowid) |
                        FW_WR_LEN16_V(DIV_ROUND_UP(size, 16)));
     wr->cookie = (uintptr_t)req;
     wr->iqid = cpu_to_be16(csio_q_physiqid(hw, req->iq_idx));
     wr->tmo_val = (uint8_t)(req->tmo);
     wr->use_xfer_cnt = 1;
     wr->xfer_cnt = cpu_to_be32(scsi_bufflen(scmnd));
     wr->ini_xfer_cnt = cpu_to_be32(scsi_bufflen(scmnd));
     /* Get RSP DMA buffer */
     dma_buf = &req->dma_buf;
 
     /* Prepare RSP SGL */
     wr->rsp_dmalen = cpu_to_be32(dma_buf->len);
     wr->rsp_dmaaddr = cpu_to_be64(dma_buf->paddr);
 
     wr->r4 = 0;
 
     wr->u.fcoe.ctl_pri = 0;
     wr->u.fcoe.cp_en_class = 0;
     wr->u.fcoe.r3_lo[0] = 0;
     wr->u.fcoe.r3_lo[1] = 0;
     csio_scsi_fcp_cmnd(req, (void *)((uintptr_t)wrp +
                     sizeof(struct fw_scsi_write_wr)));
 
     /* Move WR pointer past command and immediate data */
     sgl = (struct ulptx_sgl *)((uintptr_t)wrp +
                   sizeof(struct fw_scsi_write_wr) + ALIGN(imm, 16));
 
     /* Fill in the DSGL */
     csio_scsi_init_ultptx_dsgl(hw, req, sgl);
 }
 
 /* Calculate WR size needed for fw_scsi_read_wr/fw_scsi_write_wr */
 #define CSIO_SCSI_DATA_WRSZ(req, oper, sz, imm)                    \
 do {                                           \
     (sz) = sizeof(struct fw_scsi_##oper##_wr) + /* WR size */          \
            ALIGN((imm), 16) +           /* Immed data */       \
            sizeof(struct ulptx_sgl);        /* ulptx_sgl */        \
                                            \
     if (unlikely((req)->nsge > 1))                             \
         (sz) += (sizeof(struct ulptx_sge_pair) *               \
                 (ALIGN(((req)->nsge - 1), 2) / 2));            \
                             /* Data SGE */         \
 } while (0)
 
 /*
  * csio_scsi_read - Create a SCSI READ WR.
  * @req: IO req structure.
  *
  * Gets a WR slot in the ingress queue and initializes it with
  * SCSI READ WR.
  *
  */
 static inline void
 csio_scsi_read(struct csio_ioreq *req)
 {
     struct csio_wr_pair wrp;
     uint32_t size;
     struct csio_hw *hw = req->lnode->hwp;
     struct csio_scsim *scsim = csio_hw_to_scsim(hw);
 
     CSIO_SCSI_DATA_WRSZ(req, read, size, scsim->proto_cmd_len);
     size = ALIGN(size, 16);
 
     req->drv_status = csio_wr_get(hw, req->eq_idx, size, &wrp);
     if (likely(req->drv_status == 0)) {
         if (likely(wrp.size1 >= size)) {
             /* Initialize WR in one shot */
             csio_scsi_init_read_wr(req, wrp.addr1, size);
         } else {
             uint8_t *tmpwr = csio_q_eq_wrap(hw, req->eq_idx);
             /*
              * Make a temporary copy of the WR and write back
              * the copy into the WR pair.
              */
             csio_scsi_init_read_wr(req, (void *)tmpwr, size);
             memcpy(wrp.addr1, tmpwr, wrp.size1);
             memcpy(wrp.addr2, tmpwr + wrp.size1, size - wrp.size1);
         }
     }
 }
 
 /*
  * csio_scsi_write - Create a SCSI WRITE WR.
  * @req: IO req structure.
  *
  * Gets a WR slot in the ingress queue and initializes it with
  * SCSI WRITE WR.
  *
  */
 static inline void
 csio_scsi_write(struct csio_ioreq *req)
 {
     struct csio_wr_pair wrp;
     uint32_t size;
     struct csio_hw *hw = req->lnode->hwp;
     struct csio_scsim *scsim = csio_hw_to_scsim(hw);
 
     CSIO_SCSI_DATA_WRSZ(req, write, size, scsim->proto_cmd_len);
     size = ALIGN(size, 16);
 
     req->drv_status = csio_wr_get(hw, req->eq_idx, size, &wrp);
     if (likely(req->drv_status == 0)) {
         if (likely(wrp.size1 >= size)) {
             /* Initialize WR in one shot */
             csio_scsi_init_write_wr(req, wrp.addr1, size);
         } else {
             uint8_t *tmpwr = csio_q_eq_wrap(hw, req->eq_idx);
             /*
              * Make a temporary copy of the WR and write back
              * the copy into the WR pair.
              */
             csio_scsi_init_write_wr(req, (void *)tmpwr, size);
             memcpy(wrp.addr1, tmpwr, wrp.size1);
             memcpy(wrp.addr2, tmpwr + wrp.size1, size - wrp.size1);
         }
     }
 }
 
 /*
  * csio_setup_ddp - Setup DDP buffers for Read request.
  * @req: IO req structure.
  *
  * Checks SGLs/Data buffers are virtually contiguous required for DDP.
  * If contiguous,driver posts SGLs in the WR otherwise post internal
  * buffers for such request for DDP.
  */
 static inline void
 csio_setup_ddp(struct csio_scsim *scsim, struct csio_ioreq *req)
 {
 #ifdef __CSIO_DEBUG__
     struct csio_hw *hw = req->lnode->hwp;
 #endif
     struct scatterlist *sgel = NULL;
     struct scsi_cmnd *scmnd = csio_scsi_cmnd(req);
     uint64_t sg_addr = 0;
     uint32_t ddp_pagesz = 4096;
     uint32_t buf_off;
     struct csio_dma_buf *dma_buf = NULL;
     uint32_t alloc_len = 0;
     uint32_t xfer_len = 0;
     uint32_t sg_len = 0;
     uint32_t i;
 
     scsi_for_each_sg(scmnd, sgel, req->nsge, i) {
         sg_addr = sg_dma_address(sgel);
         sg_len  = sg_dma_len(sgel);
 
         buf_off = sg_addr & (ddp_pagesz - 1);
 
         /* Except 1st buffer,all buffer addr have to be Page aligned */
         if (i != 0 && buf_off) {
             csio_dbg(hw, "SGL addr not DDP aligned (%llx:%d)\n",
                  sg_addr, sg_len);
             goto unaligned;
         }
 
         /* Except last buffer,all buffer must end on page boundary */
         if ((i != (req->nsge - 1)) &&
             ((buf_off + sg_len) & (ddp_pagesz - 1))) {
             csio_dbg(hw,
                  "SGL addr not ending on page boundary"
                  "(%llx:%d)\n", sg_addr, sg_len);
             goto unaligned;
         }
     }
 
     /* SGL's are virtually contiguous. HW will DDP to SGLs */
     req->dcopy = 0;
     csio_scsi_read(req);
 
     return;
 
 unaligned:
     CSIO_INC_STATS(scsim, n_unaligned);
     /*
      * For unaligned SGLs, driver will allocate internal DDP buffer.
      * Once command is completed data from DDP buffer copied to SGLs
      */
     req->dcopy = 1;
 
     /* Use gen_list to store the DDP buffers */
     INIT_LIST_HEAD(&req->gen_list);
     xfer_len = scsi_bufflen(scmnd);
 
     i = 0;
     /* Allocate ddp buffers for this request */
     while (alloc_len < xfer_len) {
         dma_buf = csio_get_scsi_ddp(scsim);
         if (dma_buf == NULL || i > scsim->max_sge) {
             req->drv_status = -EBUSY;
             break;
         }
         alloc_len += dma_buf->len;
         /* Added to IO req */
         list_add_tail(&dma_buf->list, &req->gen_list);
         i++;
     }
 
     if (!req->drv_status) {
         /* set number of ddp bufs used */
         req->nsge = i;
         csio_scsi_read(req);
         return;
     }
 
      /* release dma descs */
     if (i > 0)
         csio_put_scsi_ddp_list(scsim, &req->gen_list, i);
 }
 
 /*
  * csio_scsi_init_abrt_cls_wr - Initialize an ABORT/CLOSE WR.
  * @req: IO req structure.
  * @addr: DMA location to place the payload.
  * @size: Size of WR
  * @abort: abort OR close
  *
  * Wrapper for populating fw_scsi_cmd_wr.
  */
 static inline void
 csio_scsi_init_abrt_cls_wr(struct csio_ioreq *req, void *addr, uint32_t size,
                bool abort)
 {
     struct csio_hw *hw = req->lnode->hwp;
     struct csio_rnode *rn = req->rnode;
     struct fw_scsi_abrt_cls_wr *wr = (struct fw_scsi_abrt_cls_wr *)addr;
 
     wr->op_immdlen = cpu_to_be32(FW_WR_OP_V(FW_SCSI_ABRT_CLS_WR));
     wr->flowid_len16 = cpu_to_be32(FW_WR_FLOWID_V(rn->flowid) |
                         FW_WR_LEN16_V(
                         DIV_ROUND_UP(size, 16)));
 
     wr->cookie = (uintptr_t) req;
     wr->iqid = cpu_to_be16(csio_q_physiqid(hw, req->iq_idx));
     wr->tmo_val = (uint8_t) req->tmo;
     /* 0 for CHK_ALL_IO tells FW to look up t_cookie */
     wr->sub_opcode_to_chk_all_io =
                 (FW_SCSI_ABRT_CLS_WR_SUB_OPCODE(abort) |
                  FW_SCSI_ABRT_CLS_WR_CHK_ALL_IO(0));
     wr->r3[0] = 0;
     wr->r3[1] = 0;
     wr->r3[2] = 0;
     wr->r3[3] = 0;
     /* Since we re-use the same ioreq for abort as well */
     wr->t_cookie = (uintptr_t) req;
 }
 
 static inline void
 csio_scsi_abrt_cls(struct csio_ioreq *req, bool abort)
 {
     struct csio_wr_pair wrp;
     struct csio_hw *hw = req->lnode->hwp;
     uint32_t size = ALIGN(sizeof(struct fw_scsi_abrt_cls_wr), 16);
 
     req->drv_status = csio_wr_get(hw, req->eq_idx, size, &wrp);
     if (req->drv_status != 0)
         return;
 
     if (wrp.size1 >= size) {
         /* Initialize WR in one shot */
         csio_scsi_init_abrt_cls_wr(req, wrp.addr1, size, abort);
     } else {
         uint8_t *tmpwr = csio_q_eq_wrap(hw, req->eq_idx);
         /*
          * Make a temporary copy of the WR and write back
          * the copy into the WR pair.
          */
         csio_scsi_init_abrt_cls_wr(req, (void *)tmpwr, size, abort);
         memcpy(wrp.addr1, tmpwr, wrp.size1);
         memcpy(wrp.addr2, tmpwr + wrp.size1, size - wrp.size1);
     }
 }
 
 /*****************************************************************************/
 /* START: SCSI SM                                                            */
 /*****************************************************************************/
 static void
 csio_scsis_uninit(struct csio_ioreq *req, enum csio_scsi_ev evt)
 {
     struct csio_hw *hw = req->lnode->hwp;
     struct csio_scsim *scsim = csio_hw_to_scsim(hw);
 
     switch (evt) {
     case CSIO_SCSIE_START_IO:
 
         if (req->nsge) {
             if (req->datadir == DMA_TO_DEVICE) {
                 req->dcopy = 0;
                 csio_scsi_write(req);
             } else
                 csio_setup_ddp(scsim, req);
         } else {
             csio_scsi_cmd(req);
         }
 
         if (likely(req->drv_status == 0)) {
             /* change state and enqueue on active_q */
             csio_set_state(&req->sm, csio_scsis_io_active);
             list_add_tail(&req->sm.sm_list, &scsim->active_q);
             csio_wr_issue(hw, req->eq_idx, false);
             CSIO_INC_STATS(scsim, n_active);
 
             return;
         }
         break;
 
     case CSIO_SCSIE_START_TM:
         csio_scsi_cmd(req);
         if (req->drv_status == 0) {
             /*
              * NOTE: We collect the affected I/Os prior to issuing
              * LUN reset, and not after it. This is to prevent
              * aborting I/Os that get issued after the LUN reset,
              * but prior to LUN reset completion (in the event that
              * the host stack has not blocked I/Os to a LUN that is
              * being reset.
              */
             csio_set_state(&req->sm, csio_scsis_tm_active);
             list_add_tail(&req->sm.sm_list, &scsim->active_q);
             csio_wr_issue(hw, req->eq_idx, false);
             CSIO_INC_STATS(scsim, n_tm_active);
         }
         return;
 
     case CSIO_SCSIE_ABORT:
     case CSIO_SCSIE_CLOSE:
         /*
          * NOTE:
          * We could get here due to  :
          * - a window in the cleanup path of the SCSI module
          *   (csio_scsi_abort_io()). Please see NOTE in this function.
          * - a window in the time we tried to issue an abort/close
          *   of a request to FW, and the FW completed the request
          *   itself.
          *   Print a message for now, and return INVAL either way.
          */
         req->drv_status = -EINVAL;
         csio_warn(hw, "Trying to abort/close completed IO:%p!\n", req);
         break;
 
     default:
         csio_dbg(hw, "Unhandled event:%d sent to req:%p\n", evt, req);
         CSIO_DB_ASSERT(0);
     }
 }
 
 static void
 csio_scsis_io_active(struct csio_ioreq *req, enum csio_scsi_ev evt)
 {
     struct csio_hw *hw = req->lnode->hwp;
     struct csio_scsim *scm = csio_hw_to_scsim(hw);
     struct csio_rnode *rn;
 
     switch (evt) {
     case CSIO_SCSIE_COMPLETED:
         CSIO_DEC_STATS(scm, n_active);
         list_del_init(&req->sm.sm_list);
         csio_set_state(&req->sm, csio_scsis_uninit);
         /*
          * In MSIX mode, with multiple queues, the SCSI compeltions
          * could reach us sooner than the FW events sent to indicate
          * I-T nexus loss (link down, remote device logo etc). We
          * dont want to be returning such I/Os to the upper layer
          * immediately, since we wouldnt have reported the I-T nexus
          * loss itself. This forces us to serialize such completions
          * with the reporting of the I-T nexus loss. Therefore, we
          * internally queue up such up such completions in the rnode.
          * The reporting of I-T nexus loss to the upper layer is then
          * followed by the returning of I/Os in this internal queue.
          * Having another state alongwith another queue helps us take
          * actions for events such as ABORT received while we are
          * in this rnode queue.
          */
         if (unlikely(req->wr_status != FW_SUCCESS)) {
             rn = req->rnode;
             /*
              * FW says remote device is lost, but rnode
              * doesnt reflect it.
              */
             if (csio_scsi_itnexus_loss_error(req->wr_status) &&
                         csio_is_rnode_ready(rn)) {
                 csio_set_state(&req->sm,
                         csio_scsis_shost_cmpl_await);
                 list_add_tail(&req->sm.sm_list,
                           &rn->host_cmpl_q);
             }
         }
 
         break;
 
     case CSIO_SCSIE_ABORT:
         csio_scsi_abrt_cls(req, SCSI_ABORT);
         if (req->drv_status == 0) {
             csio_wr_issue(hw, req->eq_idx, false);
             csio_set_state(&req->sm, csio_scsis_aborting);
         }
         break;
 
     case CSIO_SCSIE_CLOSE:
         csio_scsi_abrt_cls(req, SCSI_CLOSE);
         if (req->drv_status == 0) {
             csio_wr_issue(hw, req->eq_idx, false);
             csio_set_state(&req->sm, csio_scsis_closing);
         }
         break;
 
     case CSIO_SCSIE_DRVCLEANUP:
         req->wr_status = FW_HOSTERROR;
         CSIO_DEC_STATS(scm, n_active);
         csio_set_state(&req->sm, csio_scsis_uninit);
         break;
 
     default:
         csio_dbg(hw, "Unhandled event:%d sent to req:%p\n", evt, req);
         CSIO_DB_ASSERT(0);
     }
 }
 
 static void
 csio_scsis_tm_active(struct csio_ioreq *req, enum csio_scsi_ev evt)
 {
     struct csio_hw *hw = req->lnode->hwp;
     struct csio_scsim *scm = csio_hw_to_scsim(hw);
 
     switch (evt) {
     case CSIO_SCSIE_COMPLETED:
         CSIO_DEC_STATS(scm, n_tm_active);
         list_del_init(&req->sm.sm_list);
         csio_set_state(&req->sm, csio_scsis_uninit);
 
         break;
 
     case CSIO_SCSIE_ABORT:
         csio_scsi_abrt_cls(req, SCSI_ABORT);
         if (req->drv_status == 0) {
             csio_wr_issue(hw, req->eq_idx, false);
             csio_set_state(&req->sm, csio_scsis_aborting);
         }
         break;
 
 
     case CSIO_SCSIE_CLOSE:
         csio_scsi_abrt_cls(req, SCSI_CLOSE);
         if (req->drv_status == 0) {
             csio_wr_issue(hw, req->eq_idx, false);
             csio_set_state(&req->sm, csio_scsis_closing);
         }
         break;
 
     case CSIO_SCSIE_DRVCLEANUP:
         req->wr_status = FW_HOSTERROR;
         CSIO_DEC_STATS(scm, n_tm_active);
         csio_set_state(&req->sm, csio_scsis_uninit);
         break;
 
     default:
         csio_dbg(hw, "Unhandled event:%d sent to req:%p\n", evt, req);
         CSIO_DB_ASSERT(0);
     }
 }
 
 static void
 csio_scsis_aborting(struct csio_ioreq *req, enum csio_scsi_ev evt)
 {
     struct csio_hw *hw = req->lnode->hwp;
     struct csio_scsim *scm = csio_hw_to_scsim(hw);
 
     switch (evt) {
     case CSIO_SCSIE_COMPLETED:
         csio_dbg(hw,
              "ioreq %p recvd cmpltd (wr_status:%d) "
              "in aborting st\n", req, req->wr_status);
         /*
          * Use -ECANCELED to explicitly tell the ABORTED event that
          * the original I/O was returned to driver by FW.
          * We dont really care if the I/O was returned with success by
          * FW (because the ABORT and completion of the I/O crossed each
          * other), or any other return value. Once we are in aborting
          * state, the success or failure of the I/O is unimportant to
          * us.
          */
         req->drv_status = -ECANCELED;
         break;
 
     case CSIO_SCSIE_ABORT:
         CSIO_INC_STATS(scm, n_abrt_dups);
         break;
 
     case CSIO_SCSIE_ABORTED:
 
         csio_dbg(hw, "abort of %p return status:0x%x drv_status:%x\n",
              req, req->wr_status, req->drv_status);
         /*
          * Check if original I/O WR completed before the Abort
          * completion.
          */
         if (req->drv_status != -ECANCELED) {
             csio_warn(hw,
                   "Abort completed before original I/O,"
                    " req:%p\n", req);
             CSIO_DB_ASSERT(0);
         }
 
         /*
          * There are the following possible scenarios:
          * 1. The abort completed successfully, FW returned FW_SUCCESS.
          * 2. The completion of an I/O and the receipt of
          *    abort for that I/O by the FW crossed each other.
          *    The FW returned FW_EINVAL. The original I/O would have
          *    returned with FW_SUCCESS or any other SCSI error.
          * 3. The FW couldn't sent the abort out on the wire, as there
          *    was an I-T nexus loss (link down, remote device logged
          *    out etc). FW sent back an appropriate IT nexus loss status
          *    for the abort.
          * 4. FW sent an abort, but abort timed out (remote device
          *    didnt respond). FW replied back with
          *    FW_SCSI_ABORT_TIMEDOUT.
          * 5. FW couldn't genuinely abort the request for some reason,
          *    and sent us an error.
          *
          * The first 3 scenarios are treated as  succesful abort
          * operations by the host, while the last 2 are failed attempts
          * to abort. Manipulate the return value of the request
          * appropriately, so that host can convey these results
          * back to the upper layer.
          */
         if ((req->wr_status == FW_SUCCESS) ||
             (req->wr_status == FW_EINVAL) ||
             csio_scsi_itnexus_loss_error(req->wr_status))
             req->wr_status = FW_SCSI_ABORT_REQUESTED;
 
         CSIO_DEC_STATS(scm, n_active);
         list_del_init(&req->sm.sm_list);
         csio_set_state(&req->sm, csio_scsis_uninit);
         break;
 
     case CSIO_SCSIE_DRVCLEANUP:
         req->wr_status = FW_HOSTERROR;
         CSIO_DEC_STATS(scm, n_active);
         csio_set_state(&req->sm, csio_scsis_uninit);
         break;
 
     case CSIO_SCSIE_CLOSE:
         /*
          * We can receive this event from the module
          * cleanup paths, if the FW forgot to reply to the ABORT WR
          * and left this ioreq in this state. For now, just ignore
          * the event. The CLOSE event is sent to this state, as
          * the LINK may have already gone down.
          */
         break;
 
     default:
         csio_dbg(hw, "Unhandled event:%d sent to req:%p\n", evt, req);
         CSIO_DB_ASSERT(0);
     }
 }
 
 static void
 csio_scsis_closing(struct csio_ioreq *req, enum csio_scsi_ev evt)
 {
     struct csio_hw *hw = req->lnode->hwp;
     struct csio_scsim *scm = csio_hw_to_scsim(hw);
 
     switch (evt) {
     case CSIO_SCSIE_COMPLETED:
         csio_dbg(hw,
              "ioreq %p recvd cmpltd (wr_status:%d) "
              "in closing st\n", req, req->wr_status);
         /*
          * Use -ECANCELED to explicitly tell the CLOSED event that
          * the original I/O was returned to driver by FW.
          * We dont really care if the I/O was returned with success by
          * FW (because the CLOSE and completion of the I/O crossed each
          * other), or any other return value. Once we are in aborting
          * state, the success or failure of the I/O is unimportant to
          * us.
          */
         req->drv_status = -ECANCELED;
         break;
 
     case CSIO_SCSIE_CLOSED:
         /*
          * Check if original I/O WR completed before the Close
          * completion.
          */
         if (req->drv_status != -ECANCELED) {
             csio_fatal(hw,
                    "Close completed before original I/O,"
                    " req:%p\n", req);
             CSIO_DB_ASSERT(0);
         }
 
         /*
          * Either close succeeded, or we issued close to FW at the
          * same time FW compelted it to us. Either way, the I/O
          * is closed.
          */
         CSIO_DB_ASSERT((req->wr_status == FW_SUCCESS) ||
                     (req->wr_status == FW_EINVAL));
         req->wr_status = FW_SCSI_CLOSE_REQUESTED;
 
         CSIO_DEC_STATS(scm, n_active);
         list_del_init(&req->sm.sm_list);
         csio_set_state(&req->sm, csio_scsis_uninit);
         break;
 
     case CSIO_SCSIE_CLOSE:
         break;
 
     case CSIO_SCSIE_DRVCLEANUP:
         req->wr_status = FW_HOSTERROR;
         CSIO_DEC_STATS(scm, n_active);
         csio_set_state(&req->sm, csio_scsis_uninit);
         break;
 
     default:
         csio_dbg(hw, "Unhandled event:%d sent to req:%p\n", evt, req);
         CSIO_DB_ASSERT(0);
     }
 }
 
 static void
 csio_scsis_shost_cmpl_await(struct csio_ioreq *req, enum csio_scsi_ev evt)
 {
     switch (evt) {
     case CSIO_SCSIE_ABORT:
     case CSIO_SCSIE_CLOSE:
         /*
          * Just succeed the abort request, and hope that
          * the remote device unregister path will cleanup
          * this I/O to the upper layer within a sane
          * amount of time.
          */
         /*
          * A close can come in during a LINK DOWN. The FW would have
          * returned us the I/O back, but not the remote device lost
          * FW event. In this interval, if the I/O times out at the upper
          * layer, a close can come in. Take the same action as abort:
          * return success, and hope that the remote device unregister
          * path will cleanup this I/O. If the FW still doesnt send
          * the msg, the close times out, and the upper layer resorts
          * to the next level of error recovery.
          */
         req->drv_status = 0;
         break;
     case CSIO_SCSIE_DRVCLEANUP:
         csio_set_state(&req->sm, csio_scsis_uninit);
         break;
     default:
         csio_dbg(req->lnode->hwp, "Unhandled event:%d sent to req:%p\n",
              evt, req);
         CSIO_DB_ASSERT(0);
     }
 }
 
 /*
  * csio_scsi_cmpl_handler - WR completion handler for SCSI.
  * @hw: HW module.
  * @wr: The completed WR from the ingress queue.
  * @len: Length of the WR.
  * @flb: Freelist buffer array.
  * @priv: Private object
  * @scsiwr: Pointer to SCSI WR.
  *
  * This is the WR completion handler called per completion from the
  * ISR. It is called with lock held. It walks past the RSS and CPL message
  * header where the actual WR is present.
  * It then gets the status, WR handle (ioreq pointer) and the len of
  * the WR, based on WR opcode. Only on a non-good status is the entire
  * WR copied into the WR cache (ioreq->fw_wr).
  * The ioreq corresponding to the WR is returned to the caller.
  * NOTE: The SCSI queue doesnt allocate a freelist today, hence
  * no freelist buffer is expected.
  */
 struct csio_ioreq *
 csio_scsi_cmpl_handler(struct csio_hw *hw, void *wr, uint32_t len,
              struct csio_fl_dma_buf *flb, void *priv, uint8_t **scsiwr)
 {
     struct csio_ioreq *ioreq = NULL;
     struct cpl_fw6_msg *cpl;
     uint8_t *tempwr;
     uint8_t status;
     struct csio_scsim *scm = csio_hw_to_scsim(hw);
 
     /* skip RSS header */
     cpl = (struct cpl_fw6_msg *)((uintptr_t)wr + sizeof(__be64));
 
     if (unlikely(cpl->opcode != CPL_FW6_MSG)) {
         csio_warn(hw, "Error: Invalid CPL msg %x recvd on SCSI q\n",
               cpl->opcode);
         CSIO_INC_STATS(scm, n_inval_cplop);
         return NULL;
     }
 
     tempwr = (uint8_t *)(cpl->data);
     status = csio_wr_status(tempwr);
     *scsiwr = tempwr;
 
     if (likely((*tempwr == FW_SCSI_READ_WR) ||
             (*tempwr == FW_SCSI_WRITE_WR) ||
             (*tempwr == FW_SCSI_CMD_WR))) {
         ioreq = (struct csio_ioreq *)((uintptr_t)
                  (((struct fw_scsi_read_wr *)tempwr)->cookie));
         CSIO_DB_ASSERT(virt_addr_valid(ioreq));
 
         ioreq->wr_status = status;
 
         return ioreq;
     }
 
     if (*tempwr == FW_SCSI_ABRT_CLS_WR) {
         ioreq = (struct csio_ioreq *)((uintptr_t)
              (((struct fw_scsi_abrt_cls_wr *)tempwr)->cookie));
         CSIO_DB_ASSERT(virt_addr_valid(ioreq));
 
         ioreq->wr_status = status;
         return ioreq;
     }
 
     csio_warn(hw, "WR with invalid opcode in SCSI IQ: %x\n", *tempwr);
     CSIO_INC_STATS(scm, n_inval_scsiop);
     return NULL;
 }
 
 /*
  * csio_scsi_cleanup_io_q - Cleanup the given queue.
  * @scm: SCSI module.
  * @q: Queue to be cleaned up.
  *
  * Called with lock held. Has to exit with lock held.
  */
 void
 csio_scsi_cleanup_io_q(struct csio_scsim *scm, struct list_head *q)
 {
     struct csio_hw *hw = scm->hw;
     struct csio_ioreq *ioreq;
     struct list_head *tmp, *next;
     struct scsi_cmnd *scmnd;
 
     /* Call back the completion routines of the active_q */
     list_for_each_safe(tmp, next, q) {
         ioreq = (struct csio_ioreq *)tmp;
         csio_scsi_drvcleanup(ioreq);
         list_del_init(&ioreq->sm.sm_list);
         scmnd = csio_scsi_cmnd(ioreq);
         spin_unlock_irq(&hw->lock);
 
         /*
          * Upper layers may have cleared this command, hence this
          * check to avoid accessing stale references.
          */
         if (scmnd != NULL)
             ioreq->io_cbfn(hw, ioreq);
 
         spin_lock_irq(&scm->freelist_lock);
         csio_put_scsi_ioreq(scm, ioreq);
         spin_unlock_irq(&scm->freelist_lock);
 
         spin_lock_irq(&hw->lock);
     }
 }
 
 #define CSIO_SCSI_ABORT_Q_POLL_MS       2000
 
 static void
 csio_abrt_cls(struct csio_ioreq *ioreq, struct scsi_cmnd *scmnd)
 {
     struct csio_lnode *ln = ioreq->lnode;
     struct csio_hw *hw = ln->hwp;
     int ready = 0;
     struct csio_scsim *scsim = csio_hw_to_scsim(hw);
     int rv;
 
     if (csio_scsi_cmnd(ioreq) != scmnd) {
         CSIO_INC_STATS(scsim, n_abrt_race_comp);
         return;
     }
 
     ready = csio_is_lnode_ready(ln);
 
     rv = csio_do_abrt_cls(hw, ioreq, (ready ? SCSI_ABORT : SCSI_CLOSE));
     if (rv != 0) {
         if (ready)
             CSIO_INC_STATS(scsim, n_abrt_busy_error);
         else
             CSIO_INC_STATS(scsim, n_cls_busy_error);
     }
 }
 
 /*
  * csio_scsi_abort_io_q - Abort all I/Os on given queue
  * @scm: SCSI module.
  * @q: Queue to abort.
  * @tmo: Timeout in ms
  *
  * Attempt to abort all I/Os on given queue, and wait for a max
  * of tmo milliseconds for them to complete. Returns success
  * if all I/Os are aborted. Else returns -ETIMEDOUT.
  * Should be entered with lock held. Exits with lock held.
  * NOTE:
  * Lock has to be held across the loop that aborts I/Os, since dropping the lock
  * in between can cause the list to be corrupted. As a result, the caller
  * of this function has to ensure that the number of I/os to be aborted
  * is finite enough to not cause lock-held-for-too-long issues.
  */
 static int
 csio_scsi_abort_io_q(struct csio_scsim *scm, struct list_head *q, uint32_t tmo)
 {
     struct csio_hw *hw = scm->hw;
     struct list_head *tmp, *next;
     int count = DIV_ROUND_UP(tmo, CSIO_SCSI_ABORT_Q_POLL_MS);
     struct scsi_cmnd *scmnd;
 
     if (list_empty(q))
         return 0;
 
     csio_dbg(hw, "Aborting SCSI I/Os\n");
 
     /* Now abort/close I/Os in the queue passed */
     list_for_each_safe(tmp, next, q) {
         scmnd = csio_scsi_cmnd((struct csio_ioreq *)tmp);
         csio_abrt_cls((struct csio_ioreq *)tmp, scmnd);
     }
 
     /* Wait till all active I/Os are completed/aborted/closed */
     while (!list_empty(q) && count--) {
         spin_unlock_irq(&hw->lock);
         msleep(CSIO_SCSI_ABORT_Q_POLL_MS);
         spin_lock_irq(&hw->lock);
     }
 
     /* all aborts completed */
     if (list_empty(q))
         return 0;
 
     return -ETIMEDOUT;
 }
 
 /*
  * csio_scsim_cleanup_io - Cleanup all I/Os in SCSI module.
  * @scm: SCSI module.
  * @abort: abort required.
  * Called with lock held, should exit with lock held.
  * Can sleep when waiting for I/Os to complete.
  */
 int
 csio_scsim_cleanup_io(struct csio_scsim *scm, bool abort)
 {
     struct csio_hw *hw = scm->hw;
     int rv = 0;
     int count = DIV_ROUND_UP(60 * 1000, CSIO_SCSI_ABORT_Q_POLL_MS);
 
     /* No I/Os pending */
     if (list_empty(&scm->active_q))
         return 0;
 
     /* Wait until all active I/Os are completed */
     while (!list_empty(&scm->active_q) && count--) {
         spin_unlock_irq(&hw->lock);
         msleep(CSIO_SCSI_ABORT_Q_POLL_MS);
         spin_lock_irq(&hw->lock);
     }
 
     /* all I/Os completed */
     if (list_empty(&scm->active_q))
         return 0;
 
     /* Else abort */
     if (abort) {
         rv = csio_scsi_abort_io_q(scm, &scm->active_q, 30000);
         if (rv == 0)
             return rv;
         csio_dbg(hw, "Some I/O aborts timed out, cleaning up..\n");
     }
 
     csio_scsi_cleanup_io_q(scm, &scm->active_q);
 
     CSIO_DB_ASSERT(list_empty(&scm->active_q));
 
     return rv;
 }
 
 /*
  * csio_scsim_cleanup_io_lnode - Cleanup all I/Os of given lnode.
  * @scm: SCSI module.
  * @lnode: lnode
  *
  * Called with lock held, should exit with lock held.
  * Can sleep (with dropped lock) when waiting for I/Os to complete.
  */
 int
 csio_scsim_cleanup_io_lnode(struct csio_scsim *scm, struct csio_lnode *ln)
 {
     struct csio_hw *hw = scm->hw;
     struct csio_scsi_level_data sld;
     int rv;
     int count = DIV_ROUND_UP(60 * 1000, CSIO_SCSI_ABORT_Q_POLL_MS);
 
     csio_dbg(hw, "Gathering all SCSI I/Os on lnode %p\n", ln);
 
     sld.level = CSIO_LEV_LNODE;
     sld.lnode = ln;
     INIT_LIST_HEAD(&ln->cmpl_q);
     csio_scsi_gather_active_ios(scm, &sld, &ln->cmpl_q);
 
     /* No I/Os pending on this lnode  */
     if (list_empty(&ln->cmpl_q))
         return 0;
 
     /* Wait until all active I/Os on this lnode are completed */
     while (!list_empty(&ln->cmpl_q) && count--) {
         spin_unlock_irq(&hw->lock);
         msleep(CSIO_SCSI_ABORT_Q_POLL_MS);
         spin_lock_irq(&hw->lock);
     }
 
     /* all I/Os completed */
     if (list_empty(&ln->cmpl_q))
         return 0;
 
     csio_dbg(hw, "Some I/Os pending on ln:%p, aborting them..\n", ln);
 
     /* I/Os are pending, abort them */
     rv = csio_scsi_abort_io_q(scm, &ln->cmpl_q, 30000);
     if (rv != 0) {
         csio_dbg(hw, "Some I/O aborts timed out, cleaning up..\n");
         csio_scsi_cleanup_io_q(scm, &ln->cmpl_q);
     }
 
     CSIO_DB_ASSERT(list_empty(&ln->cmpl_q));
 
     return rv;
 }
 
 static ssize_t
 csio_show_hw_state(struct device *dev,
            struct device_attribute *attr, char *buf)
 {
     struct csio_lnode *ln = shost_priv(class_to_shost(dev));
     struct csio_hw *hw = csio_lnode_to_hw(ln);
 
     if (csio_is_hw_ready(hw))
         return snprintf(buf, PAGE_SIZE, "ready\n");
     else
         return snprintf(buf, PAGE_SIZE, "not ready\n");
 }
 
 /* Device reset */
 static ssize_t
 csio_device_reset(struct device *dev,
            struct device_attribute *attr, const char *buf, size_t count)
 {
     struct csio_lnode *ln = shost_priv(class_to_shost(dev));
     struct csio_hw *hw = csio_lnode_to_hw(ln);
 
     if (*buf != '1')
         return -EINVAL;
 
     /* Delete NPIV lnodes */
     csio_lnodes_exit(hw, 1);
 
     /* Block upper IOs */
     csio_lnodes_block_request(hw);
 
     spin_lock_irq(&hw->lock);
     csio_hw_reset(hw);
     spin_unlock_irq(&hw->lock);
 
     /* Unblock upper IOs */
     csio_lnodes_unblock_request(hw);
     return count;
 }
 
 /* disable port */
 static ssize_t
 csio_disable_port(struct device *dev,
            struct device_attribute *attr, const char *buf, size_t count)
 {
     struct csio_lnode *ln = shost_priv(class_to_shost(dev));
     struct csio_hw *hw = csio_lnode_to_hw(ln);
     bool disable;
 
     if (*buf == '1' || *buf == '0')
         disable = (*buf == '1') ? true : false;
     else
         return -EINVAL;
 
     /* Block upper IOs */
     csio_lnodes_block_by_port(hw, ln->portid);
 
     spin_lock_irq(&hw->lock);
     csio_disable_lnodes(hw, ln->portid, disable);
     spin_unlock_irq(&hw->lock);
 
     /* Unblock upper IOs */
     csio_lnodes_unblock_by_port(hw, ln->portid);
     return count;
 }
 
 /* Show debug level */
 static ssize_t
 csio_show_dbg_level(struct device *dev,
            struct device_attribute *attr, char *buf)
 {
     struct csio_lnode *ln = shost_priv(class_to_shost(dev));
 
     return snprintf(buf, PAGE_SIZE, "%x\n", ln->params.log_level);
 }
 
 /* Store debug level */
 static ssize_t
 csio_store_dbg_level(struct device *dev,
            struct device_attribute *attr, const char *buf, size_t count)
 {
     struct csio_lnode *ln = shost_priv(class_to_shost(dev));
     struct csio_hw *hw = csio_lnode_to_hw(ln);
     uint32_t dbg_level = 0;
 
     if (!isdigit(buf[0]))
         return -EINVAL;
 
     if (sscanf(buf, "%i", &dbg_level))
         return -EINVAL;
 
     ln->params.log_level = dbg_level;
     hw->params.log_level = dbg_level;
 
     return 0;
 }
 
 static DEVICE_ATTR(hw_state, S_IRUGO, csio_show_hw_state, NULL);
 static DEVICE_ATTR(device_reset, S_IWUSR, NULL, csio_device_reset);
 static DEVICE_ATTR(disable_port, S_IWUSR, NULL, csio_disable_port);
 static DEVICE_ATTR(dbg_level, S_IRUGO | S_IWUSR, csio_show_dbg_level,
           csio_store_dbg_level);
 
 static struct attribute *csio_fcoe_lport_attrs[] = {
     &dev_attr_hw_state.attr,
     &dev_attr_device_reset.attr,
     &dev_attr_disable_port.attr,
     &dev_attr_dbg_level.attr,
     NULL,
 };
 
 ATTRIBUTE_GROUPS(csio_fcoe_lport);
 
 static ssize_t
 csio_show_num_reg_rnodes(struct device *dev,
              struct device_attribute *attr, char *buf)
 {
     struct csio_lnode *ln = shost_priv(class_to_shost(dev));
 
     return snprintf(buf, PAGE_SIZE, "%d\n", ln->num_reg_rnodes);
 }
 
 static DEVICE_ATTR(num_reg_rnodes, S_IRUGO, csio_show_num_reg_rnodes, NULL);
 
 static struct attribute *csio_fcoe_vport_attrs[] = {
     &dev_attr_num_reg_rnodes.attr,
     &dev_attr_dbg_level.attr,
     NULL,
 };
 
 ATTRIBUTE_GROUPS(csio_fcoe_vport);
 
 static inline uint32_t
 csio_scsi_copy_to_sgl(struct csio_hw *hw, struct csio_ioreq *req)
 {
     struct scsi_cmnd *scmnd  = (struct scsi_cmnd *)csio_scsi_cmnd(req);
     struct scatterlist *sg;
     uint32_t bytes_left;
     uint32_t bytes_copy;
     uint32_t buf_off = 0;
     uint32_t start_off = 0;
     uint32_t sg_off = 0;
     void *sg_addr;
     void *buf_addr;
     struct csio_dma_buf *dma_buf;
 
     bytes_left = scsi_bufflen(scmnd);
     sg = scsi_sglist(scmnd);
     dma_buf = (struct csio_dma_buf *)csio_list_next(&req->gen_list);
 
     /* Copy data from driver buffer to SGs of SCSI CMD */
     while (bytes_left > 0 && sg && dma_buf) {
         if (buf_off >= dma_buf->len) {
             buf_off = 0;
             dma_buf = (struct csio_dma_buf *)
                     csio_list_next(dma_buf);
             continue;
         }
 
         if (start_off >= sg->length) {
             start_off -= sg->length;
             sg = sg_next(sg);
             continue;
         }
 
         buf_addr = dma_buf->vaddr + buf_off;
         sg_off = sg->offset + start_off;
         bytes_copy = min((dma_buf->len - buf_off),
                 sg->length - start_off);
         bytes_copy = min((uint32_t)(PAGE_SIZE - (sg_off & ~PAGE_MASK)),
                  bytes_copy);
 
         sg_addr = kmap_atomic(sg_page(sg) + (sg_off >> PAGE_SHIFT));
         if (!sg_addr) {
             csio_err(hw, "failed to kmap sg:%p of ioreq:%p\n",
                 sg, req);
             break;
         }
 
         csio_dbg(hw, "copy_to_sgl:sg_addr %p sg_off %d buf %p len %d\n",
                 sg_addr, sg_off, buf_addr, bytes_copy);
         memcpy(sg_addr + (sg_off & ~PAGE_MASK), buf_addr, bytes_copy);
         kunmap_atomic(sg_addr);
 
         start_off +=  bytes_copy;
         buf_off += bytes_copy;
         bytes_left -= bytes_copy;
     }
 
     if (bytes_left > 0)
         return DID_ERROR;
     else
         return DID_OK;
 }
 
 /*
  * csio_scsi_err_handler - SCSI error handler.
  * @hw: HW module.
  * @req: IO request.
  *
  */
 static inline void
 csio_scsi_err_handler(struct csio_hw *hw, struct csio_ioreq *req)
 {
     struct scsi_cmnd *cmnd  = (struct scsi_cmnd *)csio_scsi_cmnd(req);
     struct csio_scsim *scm = csio_hw_to_scsim(hw);
     struct fcp_resp_with_ext *fcp_resp;
     struct fcp_resp_rsp_info *rsp_info;
     struct csio_dma_buf *dma_buf;
     uint8_t flags, scsi_status = 0;
     uint32_t host_status = DID_OK;
     uint32_t rsp_len = 0, sns_len = 0;
     struct csio_rnode *rn = (struct csio_rnode *)(cmnd->device->hostdata);
 
 
     switch (req->wr_status) {
     case FW_HOSTERROR:
         if (unlikely(!csio_is_hw_ready(hw)))
             return;
 
         host_status = DID_ERROR;
         CSIO_INC_STATS(scm, n_hosterror);
 
         break;
     case FW_SCSI_RSP_ERR:
         dma_buf = &req->dma_buf;
         fcp_resp = (struct fcp_resp_with_ext *)dma_buf->vaddr;
         rsp_info = (struct fcp_resp_rsp_info *)(fcp_resp + 1);
         flags = fcp_resp->resp.fr_flags;
         scsi_status = fcp_resp->resp.fr_status;
 
         if (flags & FCP_RSP_LEN_VAL) {
             rsp_len = be32_to_cpu(fcp_resp->ext.fr_rsp_len);
             if ((rsp_len != 0 && rsp_len != 4 && rsp_len != 8) ||
                 (rsp_info->rsp_code != FCP_TMF_CMPL)) {
                 host_status = DID_ERROR;
                 goto out;
             }
         }
 
         if ((flags & FCP_SNS_LEN_VAL) && fcp_resp->ext.fr_sns_len) {
             sns_len = be32_to_cpu(fcp_resp->ext.fr_sns_len);
             if (sns_len > SCSI_SENSE_BUFFERSIZE)
                 sns_len = SCSI_SENSE_BUFFERSIZE;
 
             memcpy(cmnd->sense_buffer,
                    &rsp_info->_fr_resvd[0] + rsp_len, sns_len);
             CSIO_INC_STATS(scm, n_autosense);
         }
 
         scsi_set_resid(cmnd, 0);
 
         /* Under run */
         if (flags & FCP_RESID_UNDER) {
             scsi_set_resid(cmnd,
                        be32_to_cpu(fcp_resp->ext.fr_resid));
 
             if (!(flags & FCP_SNS_LEN_VAL) &&
                 (scsi_status == SAM_STAT_GOOD) &&
                 ((scsi_bufflen(cmnd) - scsi_get_resid(cmnd))
                             < cmnd->underflow))
                 host_status = DID_ERROR;
         } else if (flags & FCP_RESID_OVER)
             host_status = DID_ERROR;
 
         CSIO_INC_STATS(scm, n_rsperror);
         break;
 
     case FW_SCSI_OVER_FLOW_ERR:
         csio_warn(hw,
               "Over-flow error,cmnd:0x%x expected len:0x%x"
               " resid:0x%x\n", cmnd->cmnd[0],
               scsi_bufflen(cmnd), scsi_get_resid(cmnd));
         host_status = DID_ERROR;
         CSIO_INC_STATS(scm, n_ovflerror);
         break;
 
     case FW_SCSI_UNDER_FLOW_ERR:
         csio_warn(hw,
               "Under-flow error,cmnd:0x%x expected"
               " len:0x%x resid:0x%x lun:0x%llx ssn:0x%x\n",
               cmnd->cmnd[0], scsi_bufflen(cmnd),
               scsi_get_resid(cmnd), cmnd->device->lun,
               rn->flowid);
         host_status = DID_ERROR;
         CSIO_INC_STATS(scm, n_unflerror);
         break;
 
     case FW_SCSI_ABORT_REQUESTED:
     case FW_SCSI_ABORTED:
     case FW_SCSI_CLOSE_REQUESTED:
         csio_dbg(hw, "Req %p cmd:%p op:%x %s\n", req, cmnd,
                  cmnd->cmnd[0],
                 (req->wr_status == FW_SCSI_CLOSE_REQUESTED) ?
                 "closed" : "aborted");
         /*
          * csio_eh_abort_handler checks this value to
          * succeed or fail the abort request.
          */
         host_status = DID_REQUEUE;
         if (req->wr_status == FW_SCSI_CLOSE_REQUESTED)
             CSIO_INC_STATS(scm, n_closed);
         else
             CSIO_INC_STATS(scm, n_aborted);
         break;
 
     case FW_SCSI_ABORT_TIMEDOUT:
         /* FW timed out the abort itself */
         csio_dbg(hw, "FW timed out abort req:%p cmnd:%p status:%x\n",
              req, cmnd, req->wr_status);
         host_status = DID_ERROR;
         CSIO_INC_STATS(scm, n_abrt_timedout);
         break;
 
     case FW_RDEV_NOT_READY:
         /*
          * In firmware, a RDEV can get into this state
          * temporarily, before moving into dissapeared/lost
          * state. So, the driver should complete the request equivalent
          * to device-disappeared!
          */
         CSIO_INC_STATS(scm, n_rdev_nr_error);
         host_status = DID_ERROR;
         break;
 
     case FW_ERR_RDEV_LOST:
         CSIO_INC_STATS(scm, n_rdev_lost_error);
         host_status = DID_ERROR;
         break;
 
     case FW_ERR_RDEV_LOGO:
         CSIO_INC_STATS(scm, n_rdev_logo_error);
         host_status = DID_ERROR;
         break;
 
     case FW_ERR_RDEV_IMPL_LOGO:
         host_status = DID_ERROR;
         break;
 
     case FW_ERR_LINK_DOWN:
         CSIO_INC_STATS(scm, n_link_down_error);
         host_status = DID_ERROR;
         break;
 
     case FW_FCOE_NO_XCHG:
         CSIO_INC_STATS(scm, n_no_xchg_error);
         host_status = DID_ERROR;
         break;
 
     default:
         csio_err(hw, "Unknown SCSI FW WR status:%d req:%p cmnd:%p\n",
                 req->wr_status, req, cmnd);
         CSIO_DB_ASSERT(0);
 
         CSIO_INC_STATS(scm, n_unknown_error);
         host_status = DID_ERROR;
         break;
     }
 
 out:
     if (req->nsge > 0) {
         scsi_dma_unmap(cmnd);
         if (req->dcopy && (host_status == DID_OK))
             host_status = csio_scsi_copy_to_sgl(hw, req);
     }
 
     cmnd->result = (((host_status) << 16) | scsi_status);
     scsi_done(cmnd);
 
     /* Wake up waiting threads */
     csio_scsi_cmnd(req) = NULL;
     complete(&req->cmplobj);
 }
 
 /*
  * csio_scsi_cbfn - SCSI callback function.
  * @hw: HW module.
  * @req: IO request.
  *
  */
 static void
 csio_scsi_cbfn(struct csio_hw *hw, struct csio_ioreq *req)
 {
     struct scsi_cmnd *cmnd  = (struct scsi_cmnd *)csio_scsi_cmnd(req);
     uint8_t scsi_status = SAM_STAT_GOOD;
     uint32_t host_status = DID_OK;
 
     if (likely(req->wr_status == FW_SUCCESS)) {
         if (req->nsge > 0) {
             scsi_dma_unmap(cmnd);
             if (req->dcopy)
                 host_status = csio_scsi_copy_to_sgl(hw, req);
         }
 
         cmnd->result = (((host_status) << 16) | scsi_status);
         scsi_done(cmnd);
         csio_scsi_cmnd(req) = NULL;
         CSIO_INC_STATS(csio_hw_to_scsim(hw), n_tot_success);
     } else {
         /* Error handling */
         csio_scsi_err_handler(hw, req);
     }
 }
 
 /**
  * csio_queuecommand - Entry point to kickstart an I/O request.
  * @host:   The scsi_host pointer.
  * @cmnd:   The I/O request from ML.
  *
  * This routine does the following:
  *  - Checks for HW and Rnode module readiness.
  *  - Gets a free ioreq structure (which is already initialized
  *    to uninit during its allocation).
  *  - Maps SG elements.
  *  - Initializes ioreq members.
  *  - Kicks off the SCSI state machine for this IO.
  *  - Returns busy status on error.
  */
 static int
 csio_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmnd)
 {
     struct csio_lnode *ln = shost_priv(host);
     struct csio_hw *hw = csio_lnode_to_hw(ln);
     struct csio_scsim *scsim = csio_hw_to_scsim(hw);
     struct csio_rnode *rn = (struct csio_rnode *)(cmnd->device->hostdata);
     struct csio_ioreq *ioreq = NULL;
     unsigned long flags;
     int nsge = 0;
     int rv = SCSI_MLQUEUE_HOST_BUSY, nr;
     int retval;
     struct csio_scsi_qset *sqset;
     struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
 
     sqset = &hw->sqset[ln->portid][blk_mq_rq_cpu(scsi_cmd_to_rq(cmnd))];
 
     nr = fc_remote_port_chkready(rport);
     if (nr) {
         cmnd->result = nr;
         CSIO_INC_STATS(scsim, n_rn_nr_error);
         goto err_done;
     }
 
     if (unlikely(!csio_is_hw_ready(hw))) {
         cmnd->result = (DID_REQUEUE << 16);
         CSIO_INC_STATS(scsim, n_hw_nr_error);
         goto err_done;
     }
 
     /* Get req->nsge, if there are SG elements to be mapped  */
     nsge = scsi_dma_map(cmnd);
     if (unlikely(nsge < 0)) {
         CSIO_INC_STATS(scsim, n_dmamap_error);
         goto err;
     }
 
     /* Do we support so many mappings? */
     if (unlikely(nsge > scsim->max_sge)) {
         csio_warn(hw,
               "More SGEs than can be supported."
               " SGEs: %d, Max SGEs: %d\n", nsge, scsim->max_sge);
         CSIO_INC_STATS(scsim, n_unsupp_sge_error);
         goto err_dma_unmap;
     }
 
     /* Get a free ioreq structure - SM is already set to uninit */
     ioreq = csio_get_scsi_ioreq_lock(hw, scsim);
     if (!ioreq) {
         csio_err(hw, "Out of I/O request elements. Active #:%d\n",
              scsim->stats.n_active);
         CSIO_INC_STATS(scsim, n_no_req_error);
         goto err_dma_unmap;
     }
 
     ioreq->nsge     = nsge;
     ioreq->lnode        = ln;
     ioreq->rnode        = rn;
     ioreq->iq_idx       = sqset->iq_idx;
     ioreq->eq_idx       = sqset->eq_idx;
     ioreq->wr_status    = 0;
     ioreq->drv_status   = 0;
     csio_scsi_cmnd(ioreq)   = (void *)cmnd;
     ioreq->tmo      = 0;
     ioreq->datadir      = cmnd->sc_data_direction;
 
     if (cmnd->sc_data_direction == DMA_TO_DEVICE) {
         CSIO_INC_STATS(ln, n_output_requests);
         ln->stats.n_output_bytes += scsi_bufflen(cmnd);
     } else if (cmnd->sc_data_direction == DMA_FROM_DEVICE) {
         CSIO_INC_STATS(ln, n_input_requests);
         ln->stats.n_input_bytes += scsi_bufflen(cmnd);
     } else
         CSIO_INC_STATS(ln, n_control_requests);
 
     /* Set cbfn */
     ioreq->io_cbfn = csio_scsi_cbfn;
 
     /* Needed during abort */
     cmnd->host_scribble = (unsigned char *)ioreq;
     csio_priv(cmnd)->fc_tm_flags = 0;
 
     /* Kick off SCSI IO SM on the ioreq */
     spin_lock_irqsave(&hw->lock, flags);
     retval = csio_scsi_start_io(ioreq);
     spin_unlock_irqrestore(&hw->lock, flags);
 
     if (retval != 0) {
         csio_err(hw, "ioreq: %p couldn't be started, status:%d\n",
              ioreq, retval);
         CSIO_INC_STATS(scsim, n_busy_error);
         goto err_put_req;
     }
 
     return 0;
 
 err_put_req:
     csio_put_scsi_ioreq_lock(hw, scsim, ioreq);
 err_dma_unmap:
     if (nsge > 0)
         scsi_dma_unmap(cmnd);
 err:
     return rv;
 
 err_done:
     scsi_done(cmnd);
     return 0;
 }
 
 static int
 csio_do_abrt_cls(struct csio_hw *hw, struct csio_ioreq *ioreq, bool abort)
 {
     int rv;
     int cpu = smp_processor_id();
     struct csio_lnode *ln = ioreq->lnode;
     struct csio_scsi_qset *sqset = &hw->sqset[ln->portid][cpu];
 
     ioreq->tmo = CSIO_SCSI_ABRT_TMO_MS;
     /*
      * Use current processor queue for posting the abort/close, but retain
      * the ingress queue ID of the original I/O being aborted/closed - we
      * need the abort/close completion to be received on the same queue
      * as the original I/O.
      */
     ioreq->eq_idx = sqset->eq_idx;
 
     if (abort == SCSI_ABORT)
         rv = csio_scsi_abort(ioreq);
     else
         rv = csio_scsi_close(ioreq);
 
     return rv;
 }
 
 static int
 csio_eh_abort_handler(struct scsi_cmnd *cmnd)
 {
     struct csio_ioreq *ioreq;
     struct csio_lnode *ln = shost_priv(cmnd->device->host);
     struct csio_hw *hw = csio_lnode_to_hw(ln);
     struct csio_scsim *scsim = csio_hw_to_scsim(hw);
     int ready = 0, ret;
     unsigned long tmo = 0;
     int rv;
     struct csio_rnode *rn = (struct csio_rnode *)(cmnd->device->hostdata);
 
     ret = fc_block_scsi_eh(cmnd);
     if (ret)
         return ret;
 
     ioreq = (struct csio_ioreq *)cmnd->host_scribble;
     if (!ioreq)
         return SUCCESS;
 
     if (!rn)
         return FAILED;
 
     csio_dbg(hw,
          "Request to abort ioreq:%p cmd:%p cdb:%08llx"
          " ssni:0x%x lun:%llu iq:0x%x\n",
         ioreq, cmnd, *((uint64_t *)cmnd->cmnd), rn->flowid,
         cmnd->device->lun, csio_q_physiqid(hw, ioreq->iq_idx));
 
     if (((struct scsi_cmnd *)csio_scsi_cmnd(ioreq)) != cmnd) {
         CSIO_INC_STATS(scsim, n_abrt_race_comp);
         return SUCCESS;
     }
 
     ready = csio_is_lnode_ready(ln);
     tmo = CSIO_SCSI_ABRT_TMO_MS;
 
     reinit_completion(&ioreq->cmplobj);
     spin_lock_irq(&hw->lock);
     rv = csio_do_abrt_cls(hw, ioreq, (ready ? SCSI_ABORT : SCSI_CLOSE));
     spin_unlock_irq(&hw->lock);
 
     if (rv != 0) {
         if (rv == -EINVAL) {
             /* Return success, if abort/close request issued on
              * already completed IO
              */
             return SUCCESS;
         }
         if (ready)
             CSIO_INC_STATS(scsim, n_abrt_busy_error);
         else
             CSIO_INC_STATS(scsim, n_cls_busy_error);
 
         goto inval_scmnd;
     }
 
     wait_for_completion_timeout(&ioreq->cmplobj, msecs_to_jiffies(tmo));
 
     /* FW didnt respond to abort within our timeout */
     if (((struct scsi_cmnd *)csio_scsi_cmnd(ioreq)) == cmnd) {
 
         csio_err(hw, "Abort timed out -- req: %p\n", ioreq);
         CSIO_INC_STATS(scsim, n_abrt_timedout);
 
 inval_scmnd:
         if (ioreq->nsge > 0)
             scsi_dma_unmap(cmnd);
 
         spin_lock_irq(&hw->lock);
         csio_scsi_cmnd(ioreq) = NULL;
         spin_unlock_irq(&hw->lock);
 
         cmnd->result = (DID_ERROR << 16);
         scsi_done(cmnd);
 
         return FAILED;
     }
 
     /* FW successfully aborted the request */
     if (host_byte(cmnd->result) == DID_REQUEUE) {
         csio_info(hw,
             "Aborted SCSI command to (%d:%llu) tag %u\n",
             cmnd->device->id, cmnd->device->lun,
             scsi_cmd_to_rq(cmnd)->tag);
         return SUCCESS;
     } else {
         csio_info(hw,
             "Failed to abort SCSI command, (%d:%llu) tag %u\n",
             cmnd->device->id, cmnd->device->lun,
             scsi_cmd_to_rq(cmnd)->tag);
         return FAILED;
     }
 }
 
 /*
  * csio_tm_cbfn - TM callback function.
  * @hw: HW module.
  * @req: IO request.
  *
  * Cache the result in 'cmnd', since ioreq will be freed soon
  * after we return from here, and the waiting thread shouldnt trust
  * the ioreq contents.
  */
 static void
 csio_tm_cbfn(struct csio_hw *hw, struct csio_ioreq *req)
 {
     struct scsi_cmnd *cmnd  = (struct scsi_cmnd *)csio_scsi_cmnd(req);
     struct csio_dma_buf *dma_buf;
     uint8_t flags = 0;
     struct fcp_resp_with_ext *fcp_resp;
     struct fcp_resp_rsp_info *rsp_info;
 
     csio_dbg(hw, "req: %p in csio_tm_cbfn status: %d\n",
               req, req->wr_status);
 
     /* Cache FW return status */
     csio_priv(cmnd)->wr_status = req->wr_status;
 
     /* Special handling based on FCP response */
 
     /*
      * FW returns us this error, if flags were set. FCP4 says
      * FCP_RSP_LEN_VAL in flags shall be set for TM completions.
      * So if a target were to set this bit, we expect that the
      * rsp_code is set to FCP_TMF_CMPL for a successful TM
      * completion. Any other rsp_code means TM operation failed.
      * If a target were to just ignore setting flags, we treat
      * the TM operation as success, and FW returns FW_SUCCESS.
      */
     if (req->wr_status == FW_SCSI_RSP_ERR) {
         dma_buf = &req->dma_buf;
         fcp_resp = (struct fcp_resp_with_ext *)dma_buf->vaddr;
         rsp_info = (struct fcp_resp_rsp_info *)(fcp_resp + 1);
 
         flags = fcp_resp->resp.fr_flags;
 
         /* Modify return status if flags indicate success */
         if (flags & FCP_RSP_LEN_VAL)
             if (rsp_info->rsp_code == FCP_TMF_CMPL)
                 csio_priv(cmnd)->wr_status = FW_SUCCESS;
 
         csio_dbg(hw, "TM FCP rsp code: %d\n", rsp_info->rsp_code);
     }
 
     /* Wake up the TM handler thread */
     csio_scsi_cmnd(req) = NULL;
 }
 
 static int
 csio_eh_lun_reset_handler(struct scsi_cmnd *cmnd)
 {
     struct csio_lnode *ln = shost_priv(cmnd->device->host);
     struct csio_hw *hw = csio_lnode_to_hw(ln);
     struct csio_scsim *scsim = csio_hw_to_scsim(hw);
     struct csio_rnode *rn = (struct csio_rnode *)(cmnd->device->hostdata);
     struct csio_ioreq *ioreq = NULL;
     struct csio_scsi_qset *sqset;
     unsigned long flags;
     int retval;
     int count, ret;
     LIST_HEAD(local_q);
     struct csio_scsi_level_data sld;
 
     if (!rn)
         goto fail;
 
     csio_dbg(hw, "Request to reset LUN:%llu (ssni:0x%x tgtid:%d)\n",
               cmnd->device->lun, rn->flowid, rn->scsi_id);
 
     if (!csio_is_lnode_ready(ln)) {
         csio_err(hw,
              "LUN reset cannot be issued on non-ready"
              " local node vnpi:0x%x (LUN:%llu)\n",
              ln->vnp_flowid, cmnd->device->lun);
         goto fail;
     }
 
     /* Lnode is ready, now wait on rport node readiness */
     ret = fc_block_scsi_eh(cmnd);
     if (ret)
         return ret;
 
     /*
      * If we have blocked in the previous call, at this point, either the
      * remote node has come back online, or device loss timer has fired
      * and the remote node is destroyed. Allow the LUN reset only for
      * the former case, since LUN reset is a TMF I/O on the wire, and we
      * need a valid session to issue it.
      */
     if (fc_remote_port_chkready(rn->rport)) {
         csio_err(hw,
              "LUN reset cannot be issued on non-ready"
              " remote node ssni:0x%x (LUN:%llu)\n",
              rn->flowid, cmnd->device->lun);
         goto fail;
     }
 
     /* Get a free ioreq structure - SM is already set to uninit */
     ioreq = csio_get_scsi_ioreq_lock(hw, scsim);
 
     if (!ioreq) {
         csio_err(hw, "Out of IO request elements. Active # :%d\n",
              scsim->stats.n_active);
         goto fail;
     }
 
     sqset           = &hw->sqset[ln->portid][smp_processor_id()];
     ioreq->nsge     = 0;
     ioreq->lnode        = ln;
     ioreq->rnode        = rn;
     ioreq->iq_idx       = sqset->iq_idx;
     ioreq->eq_idx       = sqset->eq_idx;
 
     csio_scsi_cmnd(ioreq)   = cmnd;
     cmnd->host_scribble = (unsigned char *)ioreq;
     csio_priv(cmnd)->wr_status = 0;
 
     csio_priv(cmnd)->fc_tm_flags = FCP_TMF_LUN_RESET;
     ioreq->tmo      = CSIO_SCSI_LUNRST_TMO_MS / 1000;
 
     /*
      * FW times the LUN reset for ioreq->tmo, so we got to wait a little
      * longer (10s for now) than that to allow FW to return the timed
      * out command.
      */
     count = DIV_ROUND_UP((ioreq->tmo + 10) * 1000, CSIO_SCSI_TM_POLL_MS);
 
     /* Set cbfn */
     ioreq->io_cbfn = csio_tm_cbfn;
 
     /* Save of the ioreq info for later use */
     sld.level = CSIO_LEV_LUN;
     sld.lnode = ioreq->lnode;
     sld.rnode = ioreq->rnode;
     sld.oslun = cmnd->device->lun;
 
     spin_lock_irqsave(&hw->lock, flags);
     /* Kick off TM SM on the ioreq */
     retval = csio_scsi_start_tm(ioreq);
     spin_unlock_irqrestore(&hw->lock, flags);
 
     if (retval != 0) {
         csio_err(hw, "Failed to issue LUN reset, req:%p, status:%d\n",
                 ioreq, retval);
         goto fail_ret_ioreq;
     }
 
     csio_dbg(hw, "Waiting max %d secs for LUN reset completion\n",
             count * (CSIO_SCSI_TM_POLL_MS / 1000));
     /* Wait for completion */
     while ((((struct scsi_cmnd *)csio_scsi_cmnd(ioreq)) == cmnd)
                                 && count--)
         msleep(CSIO_SCSI_TM_POLL_MS);
 
     /* LUN reset timed-out */
     if (((struct scsi_cmnd *)csio_scsi_cmnd(ioreq)) == cmnd) {
         csio_err(hw, "LUN reset (%d:%llu) timed out\n",
              cmnd->device->id, cmnd->device->lun);
 
         spin_lock_irq(&hw->lock);
         csio_scsi_drvcleanup(ioreq);
         list_del_init(&ioreq->sm.sm_list);
         spin_unlock_irq(&hw->lock);
 
         goto fail_ret_ioreq;
     }
 
     /* LUN reset returned, check cached status */
     if (csio_priv(cmnd)->wr_status != FW_SUCCESS) {
         csio_err(hw, "LUN reset failed (%d:%llu), status: %d\n",
              cmnd->device->id, cmnd->device->lun,
              csio_priv(cmnd)->wr_status);
         goto fail;
     }
 
     /* LUN reset succeeded, Start aborting affected I/Os */
     /*
      * Since the host guarantees during LUN reset that there
      * will not be any more I/Os to that LUN, until the LUN reset
      * completes, we gather pending I/Os after the LUN reset.
      */
     spin_lock_irq(&hw->lock);
     csio_scsi_gather_active_ios(scsim, &sld, &local_q);
 
     retval = csio_scsi_abort_io_q(scsim, &local_q, 30000);
     spin_unlock_irq(&hw->lock);
 
     /* Aborts may have timed out */
     if (retval != 0) {
         csio_err(hw,
              "Attempt to abort I/Os during LUN reset of %llu"
              " returned %d\n", cmnd->device->lun, retval);
         /* Return I/Os back to active_q */
         spin_lock_irq(&hw->lock);
         list_splice_tail_init(&local_q, &scsim->active_q);
         spin_unlock_irq(&hw->lock);
         goto fail;
     }
 
     CSIO_INC_STATS(rn, n_lun_rst);
 
     csio_info(hw, "LUN reset occurred (%d:%llu)\n",
           cmnd->device->id, cmnd->device->lun);
 
     return SUCCESS;
 
 fail_ret_ioreq:
     csio_put_scsi_ioreq_lock(hw, scsim, ioreq);
 fail:
     CSIO_INC_STATS(rn, n_lun_rst_fail);
     return FAILED;
 }
 
 static int
 csio_slave_alloc(struct scsi_device *sdev)
 {
     struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 
     if (!rport || fc_remote_port_chkready(rport))
         return -ENXIO;
 
     sdev->hostdata = *((struct csio_lnode **)(rport->dd_data));
 
     return 0;
 }
 
 static int
 csio_slave_configure(struct scsi_device *sdev)
 {
     scsi_change_queue_depth(sdev, csio_lun_qdepth);
     return 0;
 }
 
 static void
 csio_slave_destroy(struct scsi_device *sdev)
 {
     sdev->hostdata = NULL;
 }
 
 static int
 csio_scan_finished(struct Scsi_Host *shost, unsigned long time)
 {
     struct csio_lnode *ln = shost_priv(shost);
     int rv = 1;
 
     spin_lock_irq(shost->host_lock);
     if (!ln->hwp || csio_list_deleted(&ln->sm.sm_list))
         goto out;
 
     rv = csio_scan_done(ln, jiffies, time, csio_max_scan_tmo * HZ,
                 csio_delta_scan_tmo * HZ);
 out:
     spin_unlock_irq(shost->host_lock);
 
     return rv;
 }
 
 struct scsi_host_template csio_fcoe_shost_template = {
     .module         = THIS_MODULE,
     .name           = CSIO_DRV_DESC,
     .proc_name      = KBUILD_MODNAME,
     .queuecommand       = csio_queuecommand,
     .cmd_size       = sizeof(struct csio_cmd_priv),
     .eh_timed_out       = fc_eh_timed_out,
     .eh_abort_handler   = csio_eh_abort_handler,
     .eh_device_reset_handler = csio_eh_lun_reset_handler,
     .slave_alloc        = csio_slave_alloc,
     .slave_configure    = csio_slave_configure,
     .slave_destroy      = csio_slave_destroy,
     .scan_finished      = csio_scan_finished,
     .this_id        = -1,
     .sg_tablesize       = CSIO_SCSI_MAX_SGE,
     .cmd_per_lun        = CSIO_MAX_CMD_PER_LUN,
     .shost_groups       = csio_fcoe_lport_groups,
     .max_sectors        = CSIO_MAX_SECTOR_SIZE,
 };
 
 struct scsi_host_template csio_fcoe_shost_vport_template = {
     .module         = THIS_MODULE,
     .name           = CSIO_DRV_DESC,
     .proc_name      = KBUILD_MODNAME,
     .queuecommand       = csio_queuecommand,
     .eh_timed_out       = fc_eh_timed_out,
     .eh_abort_handler   = csio_eh_abort_handler,
     .eh_device_reset_handler = csio_eh_lun_reset_handler,
     .slave_alloc        = csio_slave_alloc,
     .slave_configure    = csio_slave_configure,
     .slave_destroy      = csio_slave_destroy,
     .scan_finished      = csio_scan_finished,
     .this_id        = -1,
     .sg_tablesize       = CSIO_SCSI_MAX_SGE,
     .cmd_per_lun        = CSIO_MAX_CMD_PER_LUN,
     .shost_groups       = csio_fcoe_vport_groups,
     .max_sectors        = CSIO_MAX_SECTOR_SIZE,
 };
 
 /*
  * csio_scsi_alloc_ddp_bufs - Allocate buffers for DDP of unaligned SGLs.
  * @scm: SCSI Module
  * @hw: HW device.
  * @buf_size: buffer size
  * @num_buf : Number of buffers.
  *
  * This routine allocates DMA buffers required for SCSI Data xfer, if
  * each SGL buffer for a SCSI Read request posted by SCSI midlayer are
  * not virtually contiguous.
  */
 static int
 csio_scsi_alloc_ddp_bufs(struct csio_scsim *scm, struct csio_hw *hw,
              int buf_size, int num_buf)
 {
     int n = 0;
     struct list_head *tmp;
     struct csio_dma_buf *ddp_desc = NULL;
     uint32_t unit_size = 0;
 
     if (!num_buf)
         return 0;
 
     if (!buf_size)
         return -EINVAL;
 
     INIT_LIST_HEAD(&scm->ddp_freelist);
 
     /* Align buf size to page size */
     buf_size = (buf_size + PAGE_SIZE - 1) & PAGE_MASK;
     /* Initialize dma descriptors */
     for (n = 0; n < num_buf; n++) {
         /* Set unit size to request size */
         unit_size = buf_size;
         ddp_desc = kzalloc(sizeof(struct csio_dma_buf), GFP_KERNEL);
         if (!ddp_desc) {
             csio_err(hw,
                  "Failed to allocate ddp descriptors,"
                  " Num allocated = %d.\n",
                  scm->stats.n_free_ddp);
             goto no_mem;
         }
 
         /* Allocate Dma buffers for DDP */
         ddp_desc->vaddr = dma_alloc_coherent(&hw->pdev->dev, unit_size,
                 &ddp_desc->paddr, GFP_KERNEL);
         if (!ddp_desc->vaddr) {
             csio_err(hw,
                  "SCSI response DMA buffer (ddp) allocation"
                  " failed!\n");
             kfree(ddp_desc);
             goto no_mem;
         }
 
         ddp_desc->len = unit_size;
 
         /* Added it to scsi ddp freelist */
         list_add_tail(&ddp_desc->list, &scm->ddp_freelist);
         CSIO_INC_STATS(scm, n_free_ddp);
     }
 
     return 0;
 no_mem:
     /* release dma descs back to freelist and free dma memory */
     list_for_each(tmp, &scm->ddp_freelist) {
         ddp_desc = (struct csio_dma_buf *) tmp;
         tmp = csio_list_prev(tmp);
         dma_free_coherent(&hw->pdev->dev, ddp_desc->len,
                   ddp_desc->vaddr, ddp_desc->paddr);
         list_del_init(&ddp_desc->list);
         kfree(ddp_desc);
     }
     scm->stats.n_free_ddp = 0;
 
     return -ENOMEM;
 }
 
 /*
  * csio_scsi_free_ddp_bufs - free DDP buffers of unaligned SGLs.
  * @scm: SCSI Module
  * @hw: HW device.
  *
  * This routine frees ddp buffers.
  */
 static void
 csio_scsi_free_ddp_bufs(struct csio_scsim *scm, struct csio_hw *hw)
 {
     struct list_head *tmp;
     struct csio_dma_buf *ddp_desc;
 
     /* release dma descs back to freelist and free dma memory */
     list_for_each(tmp, &scm->ddp_freelist) {
         ddp_desc = (struct csio_dma_buf *) tmp;
         tmp = csio_list_prev(tmp);
         dma_free_coherent(&hw->pdev->dev, ddp_desc->len,
                   ddp_desc->vaddr, ddp_desc->paddr);
         list_del_init(&ddp_desc->list);
         kfree(ddp_desc);
     }
     scm->stats.n_free_ddp = 0;
 }
 
 /**
  * csio_scsim_init - Initialize SCSI Module
  * @scm:    SCSI Module
  * @hw:     HW module
  *
  */
 int
 csio_scsim_init(struct csio_scsim *scm, struct csio_hw *hw)
 {
     int i;
     struct csio_ioreq *ioreq;
     struct csio_dma_buf *dma_buf;
 
     INIT_LIST_HEAD(&scm->active_q);
     scm->hw = hw;
 
     scm->proto_cmd_len = sizeof(struct fcp_cmnd);
     scm->proto_rsp_len = CSIO_SCSI_RSP_LEN;
     scm->max_sge = CSIO_SCSI_MAX_SGE;
 
     spin_lock_init(&scm->freelist_lock);
 
     /* Pre-allocate ioreqs and initialize them */
     INIT_LIST_HEAD(&scm->ioreq_freelist);
     for (i = 0; i < csio_scsi_ioreqs; i++) {
 
         ioreq = kzalloc(sizeof(struct csio_ioreq), GFP_KERNEL);
         if (!ioreq) {
             csio_err(hw,
                  "I/O request element allocation failed, "
                  " Num allocated = %d.\n",
                  scm->stats.n_free_ioreq);
 
             goto free_ioreq;
         }
 
         /* Allocate Dma buffers for Response Payload */
         dma_buf = &ioreq->dma_buf;
         dma_buf->vaddr = dma_pool_alloc(hw->scsi_dma_pool, GFP_KERNEL,
                         &dma_buf->paddr);
         if (!dma_buf->vaddr) {
             csio_err(hw,
                  "SCSI response DMA buffer allocation"
                  " failed!\n");
             kfree(ioreq);
             goto free_ioreq;
         }
 
         dma_buf->len = scm->proto_rsp_len;
 
         /* Set state to uninit */
         csio_init_state(&ioreq->sm, csio_scsis_uninit);
         INIT_LIST_HEAD(&ioreq->gen_list);
         init_completion(&ioreq->cmplobj);
 
         list_add_tail(&ioreq->sm.sm_list, &scm->ioreq_freelist);
         CSIO_INC_STATS(scm, n_free_ioreq);
     }
 
     if (csio_scsi_alloc_ddp_bufs(scm, hw, PAGE_SIZE, csio_ddp_descs))
         goto free_ioreq;
 
     return 0;
 
 free_ioreq:
     /*
      * Free up existing allocations, since an error
      * from here means we are returning for good
      */
     while (!list_empty(&scm->ioreq_freelist)) {
         struct csio_sm *tmp;
 
         tmp = list_first_entry(&scm->ioreq_freelist,
                        struct csio_sm, sm_list);
         list_del_init(&tmp->sm_list);
         ioreq = (struct csio_ioreq *)tmp;
 
         dma_buf = &ioreq->dma_buf;
         dma_pool_free(hw->scsi_dma_pool, dma_buf->vaddr,
                   dma_buf->paddr);
 
         kfree(ioreq);
     }
 
     scm->stats.n_free_ioreq = 0;
 
     return -ENOMEM;
 }
 
 /**
  * csio_scsim_exit: Uninitialize SCSI Module
  * @scm: SCSI Module
  *
  */
 void
 csio_scsim_exit(struct csio_scsim *scm)
 {
     struct csio_ioreq *ioreq;
     struct csio_dma_buf *dma_buf;
 
     while (!list_empty(&scm->ioreq_freelist)) {
         struct csio_sm *tmp;
 
         tmp = list_first_entry(&scm->ioreq_freelist,
                        struct csio_sm, sm_list);
         list_del_init(&tmp->sm_list);
         ioreq = (struct csio_ioreq *)tmp;
 
         dma_buf = &ioreq->dma_buf;
         dma_pool_free(scm->hw->scsi_dma_pool, dma_buf->vaddr,
                   dma_buf->paddr);
 
         kfree(ioreq);
     }
 
     scm->stats.n_free_ioreq = 0;
 
     csio_scsi_free_ddp_bufs(scm, scm->hw);
 }

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