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linux/drivers/scsi/csiostor/csio_scsi.c
Varun Prakash 5c2442fd78 scsi: csiostor: fix missing data copy in csio_scsi_err_handler() 
If scsi cmd sglist is not suitable for DDP then csiostor driver uses
preallocated buffers for DDP, because of this data copy is required from
DDP buffer to scsi cmd sglist before calling ->scsi_done().

Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-04-08 22:18:35 -04:00

2524 lines
67 KiB
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/*
* 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 1;
}
return 0;
}
/*
* 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(scmnd->SCp.Message == 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 = (uint8_t)scmnd->SCp.Message;
}
}
/*
* 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 couldnt 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 couldnt 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 device_attribute *csio_fcoe_lport_attrs[] = {
&dev_attr_hw_state,
&dev_attr_device_reset,
&dev_attr_disable_port,
&dev_attr_dbg_level,
NULL,
};
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 device_attribute *csio_fcoe_vport_attrs[] = {
&dev_attr_num_reg_rnodes,
&dev_attr_dbg_level,
NULL,
};
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);
cmnd->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);
cmnd->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(cmnd->request)];
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;
cmnd->SCp.Message = 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 couldnt 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:
cmnd->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);
cmnd->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,
cmnd->request->tag);
return SUCCESS;
} else {
csio_info(hw,
"Failed to abort SCSI command, (%d:%llu) tag %u\n",
cmnd->device->id, cmnd->device->lun,
cmnd->request->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 */
cmnd->SCp.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)
cmnd->SCp.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;
cmnd->SCp.Status = 0;
cmnd->SCp.Message = 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 (cmnd->SCp.Status != FW_SUCCESS) {
csio_err(hw, "LUN reset failed (%d:%llu), status: %d\n",
cmnd->device->id, cmnd->device->lun, cmnd->SCp.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,
.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_attrs = csio_fcoe_lport_attrs,
.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_attrs = csio_fcoe_vport_attrs,
.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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