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gerrit-public.fairphone.software / kernel / msm-4.19 / c25f7cf2032aaac9bd50d6eee982719878538082 / . / drivers / scsi / fnic / fnic_scsi.c
blob: 3cc47c6e1ada8d4e38309cc496bfca641d090102 [file] [log] [blame]
/*
* Copyright 2008 Cisco Systems, Inc. All rights reserved.
* Copyright 2007 Nuova Systems, Inc. All rights reserved.
*
* This program is free software; you may redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* 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/mempool.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/workqueue.h>
#include <linux/pci.h>
#include <linux/scatterlist.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/delay.h>
#include <linux/gfp.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_tcq.h>
#include <scsi/fc/fc_els.h>
#include <scsi/fc/fc_fcoe.h>
#include <scsi/libfc.h>
#include <scsi/fc_frame.h>
#include "fnic_io.h"
#include "fnic.h"
const char *fnic_state_str[] = {
[FNIC_IN_FC_MODE] = "FNIC_IN_FC_MODE",
[FNIC_IN_FC_TRANS_ETH_MODE] = "FNIC_IN_FC_TRANS_ETH_MODE",
[FNIC_IN_ETH_MODE] = "FNIC_IN_ETH_MODE",
[FNIC_IN_ETH_TRANS_FC_MODE] = "FNIC_IN_ETH_TRANS_FC_MODE",
};
static const char *fnic_ioreq_state_str[] = {
[FNIC_IOREQ_CMD_PENDING] = "FNIC_IOREQ_CMD_PENDING",
[FNIC_IOREQ_ABTS_PENDING] = "FNIC_IOREQ_ABTS_PENDING",
[FNIC_IOREQ_ABTS_COMPLETE] = "FNIC_IOREQ_ABTS_COMPLETE",
[FNIC_IOREQ_CMD_COMPLETE] = "FNIC_IOREQ_CMD_COMPLETE",
};
static const char *fcpio_status_str[] = {
[FCPIO_SUCCESS] = "FCPIO_SUCCESS", /*0x0*/
[FCPIO_INVALID_HEADER] = "FCPIO_INVALID_HEADER",
[FCPIO_OUT_OF_RESOURCE] = "FCPIO_OUT_OF_RESOURCE",
[FCPIO_INVALID_PARAM] = "FCPIO_INVALID_PARAM]",
[FCPIO_REQ_NOT_SUPPORTED] = "FCPIO_REQ_NOT_SUPPORTED",
[FCPIO_IO_NOT_FOUND] = "FCPIO_IO_NOT_FOUND",
[FCPIO_ABORTED] = "FCPIO_ABORTED", /*0x41*/
[FCPIO_TIMEOUT] = "FCPIO_TIMEOUT",
[FCPIO_SGL_INVALID] = "FCPIO_SGL_INVALID",
[FCPIO_MSS_INVALID] = "FCPIO_MSS_INVALID",
[FCPIO_DATA_CNT_MISMATCH] = "FCPIO_DATA_CNT_MISMATCH",
[FCPIO_FW_ERR] = "FCPIO_FW_ERR",
[FCPIO_ITMF_REJECTED] = "FCPIO_ITMF_REJECTED",
[FCPIO_ITMF_FAILED] = "FCPIO_ITMF_FAILED",
[FCPIO_ITMF_INCORRECT_LUN] = "FCPIO_ITMF_INCORRECT_LUN",
[FCPIO_CMND_REJECTED] = "FCPIO_CMND_REJECTED",
[FCPIO_NO_PATH_AVAIL] = "FCPIO_NO_PATH_AVAIL",
[FCPIO_PATH_FAILED] = "FCPIO_PATH_FAILED",
[FCPIO_LUNMAP_CHNG_PEND] = "FCPIO_LUNHMAP_CHNG_PEND",
};
const char *fnic_state_to_str(unsigned int state)
{
if (state >= ARRAY_SIZE(fnic_state_str) || !fnic_state_str[state])
return "unknown";
return fnic_state_str[state];
}
static const char *fnic_ioreq_state_to_str(unsigned int state)
{
if (state >= ARRAY_SIZE(fnic_ioreq_state_str) ||
!fnic_ioreq_state_str[state])
return "unknown";
return fnic_ioreq_state_str[state];
}
static const char *fnic_fcpio_status_to_str(unsigned int status)
{
if (status >= ARRAY_SIZE(fcpio_status_str) || !fcpio_status_str[status])
return "unknown";
return fcpio_status_str[status];
}
static void fnic_cleanup_io(struct fnic *fnic, int exclude_id);
static inline spinlock_t *fnic_io_lock_hash(struct fnic *fnic,
struct scsi_cmnd *sc)
{
u32 hash = sc->request->tag & (FNIC_IO_LOCKS - 1);
return &fnic->io_req_lock[hash];
}
/*
* Unmap the data buffer and sense buffer for an io_req,
* also unmap and free the device-private scatter/gather list.
*/
static void fnic_release_ioreq_buf(struct fnic *fnic,
struct fnic_io_req *io_req,
struct scsi_cmnd *sc)
{
if (io_req->sgl_list_pa)
pci_unmap_single(fnic->pdev, io_req->sgl_list_pa,
sizeof(io_req->sgl_list[0]) * io_req->sgl_cnt,
PCI_DMA_TODEVICE);
scsi_dma_unmap(sc);
if (io_req->sgl_cnt)
mempool_free(io_req->sgl_list_alloc,
fnic->io_sgl_pool[io_req->sgl_type]);
if (io_req->sense_buf_pa)
pci_unmap_single(fnic->pdev, io_req->sense_buf_pa,
SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE);
}
/* Free up Copy Wq descriptors. Called with copy_wq lock held */
static int free_wq_copy_descs(struct fnic *fnic, struct vnic_wq_copy *wq)
{
/* if no Ack received from firmware, then nothing to clean */
if (!fnic->fw_ack_recd[0])
return 1;
/*
* Update desc_available count based on number of freed descriptors
* Account for wraparound
*/
if (wq->to_clean_index <= fnic->fw_ack_index[0])
wq->ring.desc_avail += (fnic->fw_ack_index[0]
- wq->to_clean_index + 1);
else
wq->ring.desc_avail += (wq->ring.desc_count
- wq->to_clean_index
+ fnic->fw_ack_index[0] + 1);
/*
* just bump clean index to ack_index+1 accounting for wraparound
* this will essentially free up all descriptors between
* to_clean_index and fw_ack_index, both inclusive
*/
wq->to_clean_index =
(fnic->fw_ack_index[0] + 1) % wq->ring.desc_count;
/* we have processed the acks received so far */
fnic->fw_ack_recd[0] = 0;
return 0;
}
/*
* fnic_fw_reset_handler
* Routine to send reset msg to fw
*/
int fnic_fw_reset_handler(struct fnic *fnic)
{
struct vnic_wq_copy *wq = &fnic->wq_copy[0];
int ret = 0;
unsigned long flags;
skb_queue_purge(&fnic->frame_queue);
skb_queue_purge(&fnic->tx_queue);
spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
free_wq_copy_descs(fnic, wq);
if (!vnic_wq_copy_desc_avail(wq))
ret = -EAGAIN;
else
fnic_queue_wq_copy_desc_fw_reset(wq, SCSI_NO_TAG);
spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
if (!ret)
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"Issued fw reset\n");
else
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"Failed to issue fw reset\n");
return ret;
}
/*
* fnic_flogi_reg_handler
* Routine to send flogi register msg to fw
*/
int fnic_flogi_reg_handler(struct fnic *fnic, u32 fc_id)
{
struct vnic_wq_copy *wq = &fnic->wq_copy[0];
enum fcpio_flogi_reg_format_type format;
struct fc_lport *lp = fnic->lport;
u8 gw_mac[ETH_ALEN];
int ret = 0;
unsigned long flags;
spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
free_wq_copy_descs(fnic, wq);
if (!vnic_wq_copy_desc_avail(wq)) {
ret = -EAGAIN;
goto flogi_reg_ioreq_end;
}
if (fnic->ctlr.map_dest) {
memset(gw_mac, 0xff, ETH_ALEN);
format = FCPIO_FLOGI_REG_DEF_DEST;
} else {
memcpy(gw_mac, fnic->ctlr.dest_addr, ETH_ALEN);
format = FCPIO_FLOGI_REG_GW_DEST;
}
if ((fnic->config.flags & VFCF_FIP_CAPABLE) && !fnic->ctlr.map_dest) {
fnic_queue_wq_copy_desc_fip_reg(wq, SCSI_NO_TAG,
fc_id, gw_mac,
fnic->data_src_addr,
lp->r_a_tov, lp->e_d_tov);
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"FLOGI FIP reg issued fcid %x src %pM dest %pM\n",
fc_id, fnic->data_src_addr, gw_mac);
} else {
fnic_queue_wq_copy_desc_flogi_reg(wq, SCSI_NO_TAG,
format, fc_id, gw_mac);
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"FLOGI reg issued fcid %x map %d dest %pM\n",
fc_id, fnic->ctlr.map_dest, gw_mac);
}
flogi_reg_ioreq_end:
spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
return ret;
}
/*
* fnic_queue_wq_copy_desc
* Routine to enqueue a wq copy desc
*/
static inline int fnic_queue_wq_copy_desc(struct fnic *fnic,
struct vnic_wq_copy *wq,
struct fnic_io_req *io_req,
struct scsi_cmnd *sc,
int sg_count)
{
struct scatterlist *sg;
struct fc_rport *rport = starget_to_rport(scsi_target(sc->device));
struct fc_rport_libfc_priv *rp = rport->dd_data;
struct host_sg_desc *desc;
u8 pri_tag = 0;
unsigned int i;
unsigned long intr_flags;
int flags;
u8 exch_flags;
struct scsi_lun fc_lun;
char msg[2];
if (sg_count) {
/* For each SGE, create a device desc entry */
desc = io_req->sgl_list;
for_each_sg(scsi_sglist(sc), sg, sg_count, i) {
desc->addr = cpu_to_le64(sg_dma_address(sg));
desc->len = cpu_to_le32(sg_dma_len(sg));
desc->_resvd = 0;
desc++;
}
io_req->sgl_list_pa = pci_map_single
(fnic->pdev,
io_req->sgl_list,
sizeof(io_req->sgl_list[0]) * sg_count,
PCI_DMA_TODEVICE);
}
io_req->sense_buf_pa = pci_map_single(fnic->pdev,
sc->sense_buffer,
SCSI_SENSE_BUFFERSIZE,
PCI_DMA_FROMDEVICE);
int_to_scsilun(sc->device->lun, &fc_lun);
pri_tag = FCPIO_ICMND_PTA_SIMPLE;
msg[0] = MSG_SIMPLE_TAG;
scsi_populate_tag_msg(sc, msg);
if (msg[0] == MSG_ORDERED_TAG)
pri_tag = FCPIO_ICMND_PTA_ORDERED;
/* Enqueue the descriptor in the Copy WQ */
spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
free_wq_copy_descs(fnic, wq);
if (unlikely(!vnic_wq_copy_desc_avail(wq))) {
spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
return SCSI_MLQUEUE_HOST_BUSY;
}
flags = 0;
if (sc->sc_data_direction == DMA_FROM_DEVICE)
flags = FCPIO_ICMND_RDDATA;
else if (sc->sc_data_direction == DMA_TO_DEVICE)
flags = FCPIO_ICMND_WRDATA;
exch_flags = 0;
if ((fnic->config.flags & VFCF_FCP_SEQ_LVL_ERR) &&
(rp->flags & FC_RP_FLAGS_RETRY))
exch_flags |= FCPIO_ICMND_SRFLAG_RETRY;
fnic_queue_wq_copy_desc_icmnd_16(wq, sc->request->tag,
0, exch_flags, io_req->sgl_cnt,
SCSI_SENSE_BUFFERSIZE,
io_req->sgl_list_pa,
io_req->sense_buf_pa,
0, /* scsi cmd ref, always 0 */
pri_tag, /* scsi pri and tag */
flags, /* command flags */
sc->cmnd, sc->cmd_len,
scsi_bufflen(sc),
fc_lun.scsi_lun, io_req->port_id,
rport->maxframe_size, rp->r_a_tov,
rp->e_d_tov);
spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
return 0;
}
/*
* fnic_queuecommand
* Routine to send a scsi cdb
* Called with host_lock held and interrupts disabled.
*/
int fnic_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
{
struct fc_lport *lp;
struct fc_rport *rport;
struct fnic_io_req *io_req;
struct fnic *fnic;
struct vnic_wq_copy *wq;
int ret;
int sg_count;
unsigned long flags;
unsigned long ptr;
rport = starget_to_rport(scsi_target(sc->device));
ret = fc_remote_port_chkready(rport);
if (ret) {
sc->result = ret;
done(sc);
return 0;
}
lp = shost_priv(sc->device->host);
if (lp->state != LPORT_ST_READY || !(lp->link_up))
return SCSI_MLQUEUE_HOST_BUSY;
/*
* Release host lock, use driver resource specific locks from here.
* Don't re-enable interrupts in case they were disabled prior to the
* caller disabling them.
*/
spin_unlock(lp->host->host_lock);
/* Get a new io_req for this SCSI IO */
fnic = lport_priv(lp);
io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
if (!io_req) {
ret = SCSI_MLQUEUE_HOST_BUSY;
goto out;
}
memset(io_req, 0, sizeof(*io_req));
/* Map the data buffer */
sg_count = scsi_dma_map(sc);
if (sg_count < 0) {
mempool_free(io_req, fnic->io_req_pool);
goto out;
}
/* Determine the type of scatter/gather list we need */
io_req->sgl_cnt = sg_count;
io_req->sgl_type = FNIC_SGL_CACHE_DFLT;
if (sg_count > FNIC_DFLT_SG_DESC_CNT)
io_req->sgl_type = FNIC_SGL_CACHE_MAX;
if (sg_count) {
io_req->sgl_list =
mempool_alloc(fnic->io_sgl_pool[io_req->sgl_type],
GFP_ATOMIC | GFP_DMA);
if (!io_req->sgl_list) {
ret = SCSI_MLQUEUE_HOST_BUSY;
scsi_dma_unmap(sc);
mempool_free(io_req, fnic->io_req_pool);
goto out;
}
/* Cache sgl list allocated address before alignment */
io_req->sgl_list_alloc = io_req->sgl_list;
ptr = (unsigned long) io_req->sgl_list;
if (ptr % FNIC_SG_DESC_ALIGN) {
io_req->sgl_list = (struct host_sg_desc *)
(((unsigned long) ptr
+ FNIC_SG_DESC_ALIGN - 1)
& ~(FNIC_SG_DESC_ALIGN - 1));
}
}
/* initialize rest of io_req */
io_req->port_id = rport->port_id;
CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
CMD_SP(sc) = (char *)io_req;
sc->scsi_done = done;
/* create copy wq desc and enqueue it */
wq = &fnic->wq_copy[0];
ret = fnic_queue_wq_copy_desc(fnic, wq, io_req, sc, sg_count);
if (ret) {
/*
* In case another thread cancelled the request,
* refetch the pointer under the lock.
*/
spinlock_t *io_lock = fnic_io_lock_hash(fnic, sc);
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
CMD_SP(sc) = NULL;
CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
spin_unlock_irqrestore(io_lock, flags);
if (io_req) {
fnic_release_ioreq_buf(fnic, io_req, sc);
mempool_free(io_req, fnic->io_req_pool);
}
}
out:
/* acquire host lock before returning to SCSI */
spin_lock(lp->host->host_lock);
return ret;
}
/*
* fnic_fcpio_fw_reset_cmpl_handler
* Routine to handle fw reset completion
*/
static int fnic_fcpio_fw_reset_cmpl_handler(struct fnic *fnic,
struct fcpio_fw_req *desc)
{
u8 type;
u8 hdr_status;
struct fcpio_tag tag;
int ret = 0;
unsigned long flags;
fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
/* Clean up all outstanding io requests */
fnic_cleanup_io(fnic, SCSI_NO_TAG);
spin_lock_irqsave(&fnic->fnic_lock, flags);
/* fnic should be in FC_TRANS_ETH_MODE */
if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) {
/* Check status of reset completion */
if (!hdr_status) {
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"reset cmpl success\n");
/* Ready to send flogi out */
fnic->state = FNIC_IN_ETH_MODE;
} else {
FNIC_SCSI_DBG(KERN_DEBUG,
fnic->lport->host,
"fnic fw_reset : failed %s\n",
fnic_fcpio_status_to_str(hdr_status));
/*
* Unable to change to eth mode, cannot send out flogi
* Change state to fc mode, so that subsequent Flogi
* requests from libFC will cause more attempts to
* reset the firmware. Free the cached flogi
*/
fnic->state = FNIC_IN_FC_MODE;
ret = -1;
}
} else {
FNIC_SCSI_DBG(KERN_DEBUG,
fnic->lport->host,
"Unexpected state %s while processing"
" reset cmpl\n", fnic_state_to_str(fnic->state));
ret = -1;
}
/* Thread removing device blocks till firmware reset is complete */
if (fnic->remove_wait)
complete(fnic->remove_wait);
/*
* If fnic is being removed, or fw reset failed
* free the flogi frame. Else, send it out
*/
if (fnic->remove_wait || ret) {
spin_unlock_irqrestore(&fnic->fnic_lock, flags);
skb_queue_purge(&fnic->tx_queue);
goto reset_cmpl_handler_end;
}
spin_unlock_irqrestore(&fnic->fnic_lock, flags);
fnic_flush_tx(fnic);
reset_cmpl_handler_end:
return ret;
}
/*
* fnic_fcpio_flogi_reg_cmpl_handler
* Routine to handle flogi register completion
*/
static int fnic_fcpio_flogi_reg_cmpl_handler(struct fnic *fnic,
struct fcpio_fw_req *desc)
{
u8 type;
u8 hdr_status;
struct fcpio_tag tag;
int ret = 0;
unsigned long flags;
fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
/* Update fnic state based on status of flogi reg completion */
spin_lock_irqsave(&fnic->fnic_lock, flags);
if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE) {
/* Check flogi registration completion status */
if (!hdr_status) {
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"flog reg succeeded\n");
fnic->state = FNIC_IN_FC_MODE;
} else {
FNIC_SCSI_DBG(KERN_DEBUG,
fnic->lport->host,
"fnic flogi reg :failed %s\n",
fnic_fcpio_status_to_str(hdr_status));
fnic->state = FNIC_IN_ETH_MODE;
ret = -1;
}
} else {
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"Unexpected fnic state %s while"
" processing flogi reg completion\n",
fnic_state_to_str(fnic->state));
ret = -1;
}
if (!ret) {
if (fnic->stop_rx_link_events) {
spin_unlock_irqrestore(&fnic->fnic_lock, flags);
goto reg_cmpl_handler_end;
}
spin_unlock_irqrestore(&fnic->fnic_lock, flags);
fnic_flush_tx(fnic);
queue_work(fnic_event_queue, &fnic->frame_work);
} else {
spin_unlock_irqrestore(&fnic->fnic_lock, flags);
}
reg_cmpl_handler_end:
return ret;
}
static inline int is_ack_index_in_range(struct vnic_wq_copy *wq,
u16 request_out)
{
if (wq->to_clean_index <= wq->to_use_index) {
/* out of range, stale request_out index */
if (request_out < wq->to_clean_index ||
request_out >= wq->to_use_index)
return 0;
} else {
/* out of range, stale request_out index */
if (request_out < wq->to_clean_index &&
request_out >= wq->to_use_index)
return 0;
}
/* request_out index is in range */
return 1;
}
/*
* Mark that ack received and store the Ack index. If there are multiple
* acks received before Tx thread cleans it up, the latest value will be
* used which is correct behavior. This state should be in the copy Wq
* instead of in the fnic
*/
static inline void fnic_fcpio_ack_handler(struct fnic *fnic,
unsigned int cq_index,
struct fcpio_fw_req *desc)
{
struct vnic_wq_copy *wq;
u16 request_out = desc->u.ack.request_out;
unsigned long flags;
/* mark the ack state */
wq = &fnic->wq_copy[cq_index - fnic->raw_wq_count - fnic->rq_count];
spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
if (is_ack_index_in_range(wq, request_out)) {
fnic->fw_ack_index[0] = request_out;
fnic->fw_ack_recd[0] = 1;
}
spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
}
/*
* fnic_fcpio_icmnd_cmpl_handler
* Routine to handle icmnd completions
*/
static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
struct fcpio_fw_req *desc)
{
u8 type;
u8 hdr_status;
struct fcpio_tag tag;
u32 id;
u64 xfer_len = 0;
struct fcpio_icmnd_cmpl *icmnd_cmpl;
struct fnic_io_req *io_req;
struct scsi_cmnd *sc;
unsigned long flags;
spinlock_t *io_lock;
/* Decode the cmpl description to get the io_req id */
fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
fcpio_tag_id_dec(&tag, &id);
if (id >= FNIC_MAX_IO_REQ)
return;
sc = scsi_host_find_tag(fnic->lport->host, id);
WARN_ON_ONCE(!sc);
if (!sc)
return;
io_lock = fnic_io_lock_hash(fnic, sc);
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
WARN_ON_ONCE(!io_req);
if (!io_req) {
spin_unlock_irqrestore(io_lock, flags);
return;
}
/* firmware completed the io */
io_req->io_completed = 1;
/*
* if SCSI-ML has already issued abort on this command,
* ignore completion of the IO. The abts path will clean it up
*/
if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
spin_unlock_irqrestore(io_lock, flags);
return;
}
/* Mark the IO as complete */
CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
icmnd_cmpl = &desc->u.icmnd_cmpl;
switch (hdr_status) {
case FCPIO_SUCCESS:
sc->result = (DID_OK << 16) | icmnd_cmpl->scsi_status;
xfer_len = scsi_bufflen(sc);
scsi_set_resid(sc, icmnd_cmpl->residual);
if (icmnd_cmpl->flags & FCPIO_ICMND_CMPL_RESID_UNDER)
xfer_len -= icmnd_cmpl->residual;
/*
* If queue_full, then try to reduce queue depth for all
* LUNS on the target. Todo: this should be accompanied
* by a periodic queue_depth rampup based on successful
* IO completion.
*/
if (icmnd_cmpl->scsi_status == QUEUE_FULL) {
struct scsi_device *t_sdev;
int qd = 0;
shost_for_each_device(t_sdev, sc->device->host) {
if (t_sdev->id != sc->device->id)
continue;
if (t_sdev->queue_depth > 1) {
qd = scsi_track_queue_full
(t_sdev,
t_sdev->queue_depth - 1);
if (qd == -1)
qd = t_sdev->host->cmd_per_lun;
shost_printk(KERN_INFO,
fnic->lport->host,
"scsi[%d:%d:%d:%d"
"] queue full detected,"
"new depth = %d\n",
t_sdev->host->host_no,
t_sdev->channel,
t_sdev->id, t_sdev->lun,
t_sdev->queue_depth);
}
}
}
break;
case FCPIO_TIMEOUT: /* request was timed out */
sc->result = (DID_TIME_OUT << 16) | icmnd_cmpl->scsi_status;
break;
case FCPIO_ABORTED: /* request was aborted */
sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
break;
case FCPIO_DATA_CNT_MISMATCH: /* recv/sent more/less data than exp. */
scsi_set_resid(sc, icmnd_cmpl->residual);
sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
break;
case FCPIO_OUT_OF_RESOURCE: /* out of resources to complete request */
sc->result = (DID_REQUEUE << 16) | icmnd_cmpl->scsi_status;
break;
case FCPIO_INVALID_HEADER: /* header contains invalid data */
case FCPIO_INVALID_PARAM: /* some parameter in request invalid */
case FCPIO_REQ_NOT_SUPPORTED:/* request type is not supported */
case FCPIO_IO_NOT_FOUND: /* requested I/O was not found */
case FCPIO_SGL_INVALID: /* request was aborted due to sgl error */
case FCPIO_MSS_INVALID: /* request was aborted due to mss error */
case FCPIO_FW_ERR: /* request was terminated due fw error */
default:
shost_printk(KERN_ERR, fnic->lport->host, "hdr status = %s\n",
fnic_fcpio_status_to_str(hdr_status));
sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
break;
}
/* Break link with the SCSI command */
CMD_SP(sc) = NULL;
spin_unlock_irqrestore(io_lock, flags);
fnic_release_ioreq_buf(fnic, io_req, sc);
mempool_free(io_req, fnic->io_req_pool);
if (sc->sc_data_direction == DMA_FROM_DEVICE) {
fnic->lport->host_stats.fcp_input_requests++;
fnic->fcp_input_bytes += xfer_len;
} else if (sc->sc_data_direction == DMA_TO_DEVICE) {
fnic->lport->host_stats.fcp_output_requests++;
fnic->fcp_output_bytes += xfer_len;
} else
fnic->lport->host_stats.fcp_control_requests++;
/* Call SCSI completion function to complete the IO */
if (sc->scsi_done)
sc->scsi_done(sc);
}
/* fnic_fcpio_itmf_cmpl_handler
* Routine to handle itmf completions
*/
static void fnic_fcpio_itmf_cmpl_handler(struct fnic *fnic,
struct fcpio_fw_req *desc)
{
u8 type;
u8 hdr_status;
struct fcpio_tag tag;
u32 id;
struct scsi_cmnd *sc;
struct fnic_io_req *io_req;
unsigned long flags;
spinlock_t *io_lock;
fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
fcpio_tag_id_dec(&tag, &id);
if ((id & FNIC_TAG_MASK) >= FNIC_MAX_IO_REQ)
return;
sc = scsi_host_find_tag(fnic->lport->host, id & FNIC_TAG_MASK);
WARN_ON_ONCE(!sc);
if (!sc)
return;
io_lock = fnic_io_lock_hash(fnic, sc);
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
WARN_ON_ONCE(!io_req);
if (!io_req) {
spin_unlock_irqrestore(io_lock, flags);
return;
}
if (id & FNIC_TAG_ABORT) {
/* Completion of abort cmd */
if (CMD_STATE(sc) != FNIC_IOREQ_ABTS_PENDING) {
/* This is a late completion. Ignore it */
spin_unlock_irqrestore(io_lock, flags);
return;
}
CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
CMD_ABTS_STATUS(sc) = hdr_status;
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"abts cmpl recd. id %d status %s\n",
(int)(id & FNIC_TAG_MASK),
fnic_fcpio_status_to_str(hdr_status));
/*
* If scsi_eh thread is blocked waiting for abts to complete,
* signal completion to it. IO will be cleaned in the thread
* else clean it in this context
*/
if (io_req->abts_done) {
complete(io_req->abts_done);
spin_unlock_irqrestore(io_lock, flags);
} else {
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"abts cmpl, completing IO\n");
CMD_SP(sc) = NULL;
sc->result = (DID_ERROR << 16);
spin_unlock_irqrestore(io_lock, flags);
fnic_release_ioreq_buf(fnic, io_req, sc);
mempool_free(io_req, fnic->io_req_pool);
if (sc->scsi_done)
sc->scsi_done(sc);
}
} else if (id & FNIC_TAG_DEV_RST) {
/* Completion of device reset */
CMD_LR_STATUS(sc) = hdr_status;
CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"dev reset cmpl recd. id %d status %s\n",
(int)(id & FNIC_TAG_MASK),
fnic_fcpio_status_to_str(hdr_status));
if (io_req->dr_done)
complete(io_req->dr_done);
spin_unlock_irqrestore(io_lock, flags);
} else {
shost_printk(KERN_ERR, fnic->lport->host,
"Unexpected itmf io state %s tag %x\n",
fnic_ioreq_state_to_str(CMD_STATE(sc)), id);
spin_unlock_irqrestore(io_lock, flags);
}
}
/*
* fnic_fcpio_cmpl_handler
* Routine to service the cq for wq_copy
*/
static int fnic_fcpio_cmpl_handler(struct vnic_dev *vdev,
unsigned int cq_index,
struct fcpio_fw_req *desc)
{
struct fnic *fnic = vnic_dev_priv(vdev);
int ret = 0;
switch (desc->hdr.type) {
case FCPIO_ACK: /* fw copied copy wq desc to its queue */
fnic_fcpio_ack_handler(fnic, cq_index, desc);
break;
case FCPIO_ICMND_CMPL: /* fw completed a command */
fnic_fcpio_icmnd_cmpl_handler(fnic, desc);
break;
case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
fnic_fcpio_itmf_cmpl_handler(fnic, desc);
break;
case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
ret = fnic_fcpio_flogi_reg_cmpl_handler(fnic, desc);
break;
case FCPIO_RESET_CMPL: /* fw completed reset */
ret = fnic_fcpio_fw_reset_cmpl_handler(fnic, desc);
break;
default:
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"firmware completion type %d\n",
desc->hdr.type);
break;
}
return ret;
}
/*
* fnic_wq_copy_cmpl_handler
* Routine to process wq copy
*/
int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int copy_work_to_do)
{
unsigned int wq_work_done = 0;
unsigned int i, cq_index;
unsigned int cur_work_done;
for (i = 0; i < fnic->wq_copy_count; i++) {
cq_index = i + fnic->raw_wq_count + fnic->rq_count;
cur_work_done = vnic_cq_copy_service(&fnic->cq[cq_index],
fnic_fcpio_cmpl_handler,
copy_work_to_do);
wq_work_done += cur_work_done;
}
return wq_work_done;
}
static void fnic_cleanup_io(struct fnic *fnic, int exclude_id)
{
unsigned int i;
struct fnic_io_req *io_req;
unsigned long flags = 0;
struct scsi_cmnd *sc;
spinlock_t *io_lock;
for (i = 0; i < FNIC_MAX_IO_REQ; i++) {
if (i == exclude_id)
continue;
sc = scsi_host_find_tag(fnic->lport->host, i);
if (!sc)
continue;
io_lock = fnic_io_lock_hash(fnic, sc);
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
if (!io_req) {
spin_unlock_irqrestore(io_lock, flags);
goto cleanup_scsi_cmd;
}
CMD_SP(sc) = NULL;
spin_unlock_irqrestore(io_lock, flags);
/*
* If there is a scsi_cmnd associated with this io_req, then
* free the corresponding state
*/
fnic_release_ioreq_buf(fnic, io_req, sc);
mempool_free(io_req, fnic->io_req_pool);
cleanup_scsi_cmd:
sc->result = DID_TRANSPORT_DISRUPTED << 16;
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "fnic_cleanup_io:"
" DID_TRANSPORT_DISRUPTED\n");
/* Complete the command to SCSI */
if (sc->scsi_done)
sc->scsi_done(sc);
}
}
void fnic_wq_copy_cleanup_handler(struct vnic_wq_copy *wq,
struct fcpio_host_req *desc)
{
u32 id;
struct fnic *fnic = vnic_dev_priv(wq->vdev);
struct fnic_io_req *io_req;
struct scsi_cmnd *sc;
unsigned long flags;
spinlock_t *io_lock;
/* get the tag reference */
fcpio_tag_id_dec(&desc->hdr.tag, &id);
id &= FNIC_TAG_MASK;
if (id >= FNIC_MAX_IO_REQ)
return;
sc = scsi_host_find_tag(fnic->lport->host, id);
if (!sc)
return;
io_lock = fnic_io_lock_hash(fnic, sc);
spin_lock_irqsave(io_lock, flags);
/* Get the IO context which this desc refers to */
io_req = (struct fnic_io_req *)CMD_SP(sc);
/* fnic interrupts are turned off by now */
if (!io_req) {
spin_unlock_irqrestore(io_lock, flags);
goto wq_copy_cleanup_scsi_cmd;
}
CMD_SP(sc) = NULL;
spin_unlock_irqrestore(io_lock, flags);
fnic_release_ioreq_buf(fnic, io_req, sc);
mempool_free(io_req, fnic->io_req_pool);
wq_copy_cleanup_scsi_cmd:
sc->result = DID_NO_CONNECT << 16;
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "wq_copy_cleanup_handler:"
" DID_NO_CONNECT\n");
if (sc->scsi_done)
sc->scsi_done(sc);
}
static inline int fnic_queue_abort_io_req(struct fnic *fnic, int tag,
u32 task_req, u8 *fc_lun,
struct fnic_io_req *io_req)
{
struct vnic_wq_copy *wq = &fnic->wq_copy[0];
unsigned long flags;
spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
free_wq_copy_descs(fnic, wq);
if (!vnic_wq_copy_desc_avail(wq)) {
spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
return 1;
}
fnic_queue_wq_copy_desc_itmf(wq, tag | FNIC_TAG_ABORT,
0, task_req, tag, fc_lun, io_req->port_id,
fnic->config.ra_tov, fnic->config.ed_tov);
spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
return 0;
}
void fnic_rport_exch_reset(struct fnic *fnic, u32 port_id)
{
int tag;
struct fnic_io_req *io_req;
spinlock_t *io_lock;
unsigned long flags;
struct scsi_cmnd *sc;
struct scsi_lun fc_lun;
enum fnic_ioreq_state old_ioreq_state;
FNIC_SCSI_DBG(KERN_DEBUG,
fnic->lport->host,
"fnic_rport_reset_exch called portid 0x%06x\n",
port_id);
if (fnic->in_remove)
return;
for (tag = 0; tag < FNIC_MAX_IO_REQ; tag++) {
sc = scsi_host_find_tag(fnic->lport->host, tag);
if (!sc)
continue;
io_lock = fnic_io_lock_hash(fnic, sc);
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
if (!io_req || io_req->port_id != port_id) {
spin_unlock_irqrestore(io_lock, flags);
continue;
}
/*
* Found IO that is still pending with firmware and
* belongs to rport that went away
*/
if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
spin_unlock_irqrestore(io_lock, flags);
continue;
}
old_ioreq_state = CMD_STATE(sc);
CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
BUG_ON(io_req->abts_done);
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"fnic_rport_reset_exch: Issuing abts\n");
spin_unlock_irqrestore(io_lock, flags);
/* Now queue the abort command to firmware */
int_to_scsilun(sc->device->lun, &fc_lun);
if (fnic_queue_abort_io_req(fnic, tag,
FCPIO_ITMF_ABT_TASK_TERM,
fc_lun.scsi_lun, io_req)) {
/*
* Revert the cmd state back to old state, if
* it hasnt changed in between. This cmd will get
* aborted later by scsi_eh, or cleaned up during
* lun reset
*/
io_lock = fnic_io_lock_hash(fnic, sc);
spin_lock_irqsave(io_lock, flags);
if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
CMD_STATE(sc) = old_ioreq_state;
spin_unlock_irqrestore(io_lock, flags);
}
}
}
void fnic_terminate_rport_io(struct fc_rport *rport)
{
int tag;
struct fnic_io_req *io_req;
spinlock_t *io_lock;
unsigned long flags;
struct scsi_cmnd *sc;
struct scsi_lun fc_lun;
struct fc_rport_libfc_priv *rdata = rport->dd_data;
struct fc_lport *lport = rdata->local_port;
struct fnic *fnic = lport_priv(lport);
struct fc_rport *cmd_rport;
enum fnic_ioreq_state old_ioreq_state;
FNIC_SCSI_DBG(KERN_DEBUG,
fnic->lport->host, "fnic_terminate_rport_io called"
" wwpn 0x%llx, wwnn0x%llx, portid 0x%06x\n",
rport->port_name, rport->node_name,
rport->port_id);
if (fnic->in_remove)
return;
for (tag = 0; tag < FNIC_MAX_IO_REQ; tag++) {
sc = scsi_host_find_tag(fnic->lport->host, tag);
if (!sc)
continue;
cmd_rport = starget_to_rport(scsi_target(sc->device));
if (rport != cmd_rport)
continue;
io_lock = fnic_io_lock_hash(fnic, sc);
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
if (!io_req || rport != cmd_rport) {
spin_unlock_irqrestore(io_lock, flags);
continue;
}
/*
* Found IO that is still pending with firmware and
* belongs to rport that went away
*/
if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
spin_unlock_irqrestore(io_lock, flags);
continue;
}
old_ioreq_state = CMD_STATE(sc);
CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
BUG_ON(io_req->abts_done);
FNIC_SCSI_DBG(KERN_DEBUG,
fnic->lport->host,
"fnic_terminate_rport_io: Issuing abts\n");
spin_unlock_irqrestore(io_lock, flags);
/* Now queue the abort command to firmware */
int_to_scsilun(sc->device->lun, &fc_lun);
if (fnic_queue_abort_io_req(fnic, tag,
FCPIO_ITMF_ABT_TASK_TERM,
fc_lun.scsi_lun, io_req)) {
/*
* Revert the cmd state back to old state, if
* it hasnt changed in between. This cmd will get
* aborted later by scsi_eh, or cleaned up during
* lun reset
*/
io_lock = fnic_io_lock_hash(fnic, sc);
spin_lock_irqsave(io_lock, flags);
if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
CMD_STATE(sc) = old_ioreq_state;
spin_unlock_irqrestore(io_lock, flags);
}
}
}
/*
* This function is exported to SCSI for sending abort cmnds.
* A SCSI IO is represented by a io_req in the driver.
* The ioreq is linked to the SCSI Cmd, thus a link with the ULP's IO.
*/
int fnic_abort_cmd(struct scsi_cmnd *sc)
{
struct fc_lport *lp;
struct fnic *fnic;
struct fnic_io_req *io_req;
struct fc_rport *rport;
spinlock_t *io_lock;
unsigned long flags;
int ret = SUCCESS;
u32 task_req;
struct scsi_lun fc_lun;
DECLARE_COMPLETION_ONSTACK(tm_done);
/* Wait for rport to unblock */
fc_block_scsi_eh(sc);
/* Get local-port, check ready and link up */
lp = shost_priv(sc->device->host);
fnic = lport_priv(lp);
FNIC_SCSI_DBG(KERN_DEBUG,
fnic->lport->host,
"Abort Cmd called FCID 0x%x, LUN 0x%x TAG %d\n",
(starget_to_rport(scsi_target(sc->device)))->port_id,
sc->device->lun, sc->request->tag);
if (lp->state != LPORT_ST_READY || !(lp->link_up)) {
ret = FAILED;
goto fnic_abort_cmd_end;
}
/*
* Avoid a race between SCSI issuing the abort and the device
* completing the command.
*
* If the command is already completed by the fw cmpl code,
* we just return SUCCESS from here. This means that the abort
* succeeded. In the SCSI ML, since the timeout for command has
* happened, the completion wont actually complete the command
* and it will be considered as an aborted command
*
* The CMD_SP will not be cleared except while holding io_req_lock.
*/
io_lock = fnic_io_lock_hash(fnic, sc);
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
if (!io_req) {
spin_unlock_irqrestore(io_lock, flags);
goto fnic_abort_cmd_end;
}
io_req->abts_done = &tm_done;
if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
spin_unlock_irqrestore(io_lock, flags);
goto wait_pending;
}
/*
* Command is still pending, need to abort it
* If the firmware completes the command after this point,
* the completion wont be done till mid-layer, since abort
* has already started.
*/
CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
spin_unlock_irqrestore(io_lock, flags);
/*
* Check readiness of the remote port. If the path to remote
* port is up, then send abts to the remote port to terminate
* the IO. Else, just locally terminate the IO in the firmware
*/
rport = starget_to_rport(scsi_target(sc->device));
if (fc_remote_port_chkready(rport) == 0)
task_req = FCPIO_ITMF_ABT_TASK;
else
task_req = FCPIO_ITMF_ABT_TASK_TERM;
/* Now queue the abort command to firmware */
int_to_scsilun(sc->device->lun, &fc_lun);
if (fnic_queue_abort_io_req(fnic, sc->request->tag, task_req,
fc_lun.scsi_lun, io_req)) {
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
if (io_req)
io_req->abts_done = NULL;
spin_unlock_irqrestore(io_lock, flags);
ret = FAILED;
goto fnic_abort_cmd_end;
}
/*
* We queued an abort IO, wait for its completion.
* Once the firmware completes the abort command, it will
* wake up this thread.
*/
wait_pending:
wait_for_completion_timeout(&tm_done,
msecs_to_jiffies
(2 * fnic->config.ra_tov +
fnic->config.ed_tov));
/* Check the abort status */
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
if (!io_req) {
spin_unlock_irqrestore(io_lock, flags);
ret = FAILED;
goto fnic_abort_cmd_end;
}
io_req->abts_done = NULL;
/* fw did not complete abort, timed out */
if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
spin_unlock_irqrestore(io_lock, flags);
ret = FAILED;
goto fnic_abort_cmd_end;
}
/*
* firmware completed the abort, check the status,
* free the io_req irrespective of failure or success
*/
if (CMD_ABTS_STATUS(sc) != FCPIO_SUCCESS)
ret = FAILED;
CMD_SP(sc) = NULL;
spin_unlock_irqrestore(io_lock, flags);
fnic_release_ioreq_buf(fnic, io_req, sc);
mempool_free(io_req, fnic->io_req_pool);
fnic_abort_cmd_end:
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"Returning from abort cmd %s\n",
(ret == SUCCESS) ?
"SUCCESS" : "FAILED");
return ret;
}
static inline int fnic_queue_dr_io_req(struct fnic *fnic,
struct scsi_cmnd *sc,
struct fnic_io_req *io_req)
{
struct vnic_wq_copy *wq = &fnic->wq_copy[0];
struct scsi_lun fc_lun;
int ret = 0;
unsigned long intr_flags;
spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
free_wq_copy_descs(fnic, wq);
if (!vnic_wq_copy_desc_avail(wq)) {
ret = -EAGAIN;
goto lr_io_req_end;
}
/* fill in the lun info */
int_to_scsilun(sc->device->lun, &fc_lun);
fnic_queue_wq_copy_desc_itmf(wq, sc->request->tag | FNIC_TAG_DEV_RST,
0, FCPIO_ITMF_LUN_RESET, SCSI_NO_TAG,
fc_lun.scsi_lun, io_req->port_id,
fnic->config.ra_tov, fnic->config.ed_tov);
lr_io_req_end:
spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
return ret;
}
/*
* Clean up any pending aborts on the lun
* For each outstanding IO on this lun, whose abort is not completed by fw,
* issue a local abort. Wait for abort to complete. Return 0 if all commands
* successfully aborted, 1 otherwise
*/
static int fnic_clean_pending_aborts(struct fnic *fnic,
struct scsi_cmnd *lr_sc)
{
int tag;
struct fnic_io_req *io_req;
spinlock_t *io_lock;
unsigned long flags;
int ret = 0;
struct scsi_cmnd *sc;
struct fc_rport *rport;
struct scsi_lun fc_lun;
struct scsi_device *lun_dev = lr_sc->device;
DECLARE_COMPLETION_ONSTACK(tm_done);
for (tag = 0; tag < FNIC_MAX_IO_REQ; tag++) {
sc = scsi_host_find_tag(fnic->lport->host, tag);
/*
* ignore this lun reset cmd or cmds that do not belong to
* this lun
*/
if (!sc || sc == lr_sc || sc->device != lun_dev)
continue;
io_lock = fnic_io_lock_hash(fnic, sc);
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
if (!io_req || sc->device != lun_dev) {
spin_unlock_irqrestore(io_lock, flags);
continue;
}
/*
* Found IO that is still pending with firmware and
* belongs to the LUN that we are resetting
*/
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"Found IO in %s on lun\n",
fnic_ioreq_state_to_str(CMD_STATE(sc)));
BUG_ON(CMD_STATE(sc) != FNIC_IOREQ_ABTS_PENDING);
CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
io_req->abts_done = &tm_done;
spin_unlock_irqrestore(io_lock, flags);
/* Now queue the abort command to firmware */
int_to_scsilun(sc->device->lun, &fc_lun);
rport = starget_to_rport(scsi_target(sc->device));
if (fnic_queue_abort_io_req(fnic, tag,
FCPIO_ITMF_ABT_TASK_TERM,
fc_lun.scsi_lun, io_req)) {
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
if (io_req)
io_req->abts_done = NULL;
spin_unlock_irqrestore(io_lock, flags);
ret = 1;
goto clean_pending_aborts_end;
}
wait_for_completion_timeout(&tm_done,
msecs_to_jiffies
(fnic->config.ed_tov));
/* Recheck cmd state to check if it is now aborted */
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
if (!io_req) {
spin_unlock_irqrestore(io_lock, flags);
ret = 1;
goto clean_pending_aborts_end;
}
io_req->abts_done = NULL;
/* if abort is still pending with fw, fail */
if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
spin_unlock_irqrestore(io_lock, flags);
ret = 1;
goto clean_pending_aborts_end;
}
CMD_SP(sc) = NULL;
spin_unlock_irqrestore(io_lock, flags);
fnic_release_ioreq_buf(fnic, io_req, sc);
mempool_free(io_req, fnic->io_req_pool);
}
clean_pending_aborts_end:
return ret;
}
/*
* SCSI Eh thread issues a Lun Reset when one or more commands on a LUN
* fail to get aborted. It calls driver's eh_device_reset with a SCSI command
* on the LUN.
*/
int fnic_device_reset(struct scsi_cmnd *sc)
{
struct fc_lport *lp;
struct fnic *fnic;
struct fnic_io_req *io_req;
struct fc_rport *rport;
int status;
int ret = FAILED;
spinlock_t *io_lock;
unsigned long flags;
DECLARE_COMPLETION_ONSTACK(tm_done);
/* Wait for rport to unblock */
fc_block_scsi_eh(sc);
/* Get local-port, check ready and link up */
lp = shost_priv(sc->device->host);
fnic = lport_priv(lp);
FNIC_SCSI_DBG(KERN_DEBUG,
fnic->lport->host,
"Device reset called FCID 0x%x, LUN 0x%x\n",
(starget_to_rport(scsi_target(sc->device)))->port_id,
sc->device->lun);
if (lp->state != LPORT_ST_READY || !(lp->link_up))
goto fnic_device_reset_end;
/* Check if remote port up */
rport = starget_to_rport(scsi_target(sc->device));
if (fc_remote_port_chkready(rport))
goto fnic_device_reset_end;
io_lock = fnic_io_lock_hash(fnic, sc);
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
/*
* If there is a io_req attached to this command, then use it,
* else allocate a new one.
*/
if (!io_req) {
io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
if (!io_req) {
spin_unlock_irqrestore(io_lock, flags);
goto fnic_device_reset_end;
}
memset(io_req, 0, sizeof(*io_req));
io_req->port_id = rport->port_id;
CMD_SP(sc) = (char *)io_req;
}
io_req->dr_done = &tm_done;
CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
CMD_LR_STATUS(sc) = FCPIO_INVALID_CODE;
spin_unlock_irqrestore(io_lock, flags);
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "TAG %d\n",
sc->request->tag);
/*
* issue the device reset, if enqueue failed, clean up the ioreq
* and break assoc with scsi cmd
*/
if (fnic_queue_dr_io_req(fnic, sc, io_req)) {
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
if (io_req)
io_req->dr_done = NULL;
goto fnic_device_reset_clean;
}
/*
* Wait on the local completion for LUN reset. The io_req may be
* freed while we wait since we hold no lock.
*/
wait_for_completion_timeout(&tm_done,
msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
if (!io_req) {
spin_unlock_irqrestore(io_lock, flags);
goto fnic_device_reset_end;
}
io_req->dr_done = NULL;
status = CMD_LR_STATUS(sc);
spin_unlock_irqrestore(io_lock, flags);
/*
* If lun reset not completed, bail out with failed. io_req
* gets cleaned up during higher levels of EH
*/
if (status == FCPIO_INVALID_CODE) {
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"Device reset timed out\n");
goto fnic_device_reset_end;
}
/* Completed, but not successful, clean up the io_req, return fail */
if (status != FCPIO_SUCCESS) {
spin_lock_irqsave(io_lock, flags);
FNIC_SCSI_DBG(KERN_DEBUG,
fnic->lport->host,
"Device reset completed - failed\n");
io_req = (struct fnic_io_req *)CMD_SP(sc);
goto fnic_device_reset_clean;
}
/*
* Clean up any aborts on this lun that have still not
* completed. If any of these fail, then LUN reset fails.
* clean_pending_aborts cleans all cmds on this lun except
* the lun reset cmd. If all cmds get cleaned, the lun reset
* succeeds
*/
if (fnic_clean_pending_aborts(fnic, sc)) {
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"Device reset failed"
" since could not abort all IOs\n");
goto fnic_device_reset_clean;
}
/* Clean lun reset command */
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
if (io_req)
/* Completed, and successful */
ret = SUCCESS;
fnic_device_reset_clean:
if (io_req)
CMD_SP(sc) = NULL;
spin_unlock_irqrestore(io_lock, flags);
if (io_req) {
fnic_release_ioreq_buf(fnic, io_req, sc);
mempool_free(io_req, fnic->io_req_pool);
}
fnic_device_reset_end:
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"Returning from device reset %s\n",
(ret == SUCCESS) ?
"SUCCESS" : "FAILED");
return ret;
}
/* Clean up all IOs, clean up libFC local port */
int fnic_reset(struct Scsi_Host *shost)
{
struct fc_lport *lp;
struct fnic *fnic;
int ret = SUCCESS;
lp = shost_priv(shost);
fnic = lport_priv(lp);
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"fnic_reset called\n");
/*
* Reset local port, this will clean up libFC exchanges,
* reset remote port sessions, and if link is up, begin flogi
*/
if (lp->tt.lport_reset(lp))
ret = FAILED;
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"Returning from fnic reset %s\n",
(ret == SUCCESS) ?
"SUCCESS" : "FAILED");
return ret;
}
/*
* SCSI Error handling calls driver's eh_host_reset if all prior
* error handling levels return FAILED. If host reset completes
* successfully, and if link is up, then Fabric login begins.
*
* Host Reset is the highest level of error recovery. If this fails, then
* host is offlined by SCSI.
*
*/
int fnic_host_reset(struct scsi_cmnd *sc)
{
int ret;
unsigned long wait_host_tmo;
struct Scsi_Host *shost = sc->device->host;
struct fc_lport *lp = shost_priv(shost);
/*
* If fnic_reset is successful, wait for fabric login to complete
* scsi-ml tries to send a TUR to every device if host reset is
* successful, so before returning to scsi, fabric should be up
*/
ret = fnic_reset(shost);
if (ret == SUCCESS) {
wait_host_tmo = jiffies + FNIC_HOST_RESET_SETTLE_TIME * HZ;
ret = FAILED;
while (time_before(jiffies, wait_host_tmo)) {
if ((lp->state == LPORT_ST_READY) &&
(lp->link_up)) {
ret = SUCCESS;
break;
}
ssleep(1);
}
}
return ret;
}
/*
* This fxn is called from libFC when host is removed
*/
void fnic_scsi_abort_io(struct fc_lport *lp)
{
int err = 0;
unsigned long flags;
enum fnic_state old_state;
struct fnic *fnic = lport_priv(lp);
DECLARE_COMPLETION_ONSTACK(remove_wait);
/* Issue firmware reset for fnic, wait for reset to complete */
spin_lock_irqsave(&fnic->fnic_lock, flags);
fnic->remove_wait = &remove_wait;
old_state = fnic->state;
fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
spin_unlock_irqrestore(&fnic->fnic_lock, flags);
err = fnic_fw_reset_handler(fnic);
if (err) {
spin_lock_irqsave(&fnic->fnic_lock, flags);
if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
fnic->state = old_state;
fnic->remove_wait = NULL;
spin_unlock_irqrestore(&fnic->fnic_lock, flags);
return;
}
/* Wait for firmware reset to complete */
wait_for_completion_timeout(&remove_wait,
msecs_to_jiffies(FNIC_RMDEVICE_TIMEOUT));
spin_lock_irqsave(&fnic->fnic_lock, flags);
fnic->remove_wait = NULL;
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"fnic_scsi_abort_io %s\n",
(fnic->state == FNIC_IN_ETH_MODE) ?
"SUCCESS" : "FAILED");
spin_unlock_irqrestore(&fnic->fnic_lock, flags);
}
/*
* This fxn called from libFC to clean up driver IO state on link down
*/
void fnic_scsi_cleanup(struct fc_lport *lp)
{
unsigned long flags;
enum fnic_state old_state;
struct fnic *fnic = lport_priv(lp);
/* issue fw reset */
spin_lock_irqsave(&fnic->fnic_lock, flags);
old_state = fnic->state;
fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
spin_unlock_irqrestore(&fnic->fnic_lock, flags);
if (fnic_fw_reset_handler(fnic)) {
spin_lock_irqsave(&fnic->fnic_lock, flags);
if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
fnic->state = old_state;
spin_unlock_irqrestore(&fnic->fnic_lock, flags);
}
}
void fnic_empty_scsi_cleanup(struct fc_lport *lp)
{
}
void fnic_exch_mgr_reset(struct fc_lport *lp, u32 sid, u32 did)
{
struct fnic *fnic = lport_priv(lp);
/* Non-zero sid, nothing to do */
if (sid)
goto call_fc_exch_mgr_reset;
if (did) {
fnic_rport_exch_reset(fnic, did);
goto call_fc_exch_mgr_reset;
}
/*
* sid = 0, did = 0
* link down or device being removed
*/
if (!fnic->in_remove)
fnic_scsi_cleanup(lp);
else
fnic_scsi_abort_io(lp);
/* call libFC exch mgr reset to reset its exchanges */
call_fc_exch_mgr_reset:
fc_exch_mgr_reset(lp, sid, did);
}