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scsi: target: tcm_loop: Use block cmd allocator for se_cmds 

Make tcm_loop use the block layer cmd allocator for se_cmds instead of
using the tcm_loop_cmd_cache. In the future when we can use the host tags
for internal requests like TMFs we can completely kill the
tcm_loop_cmd_cache.

Link: https://lore.kernel.org/r/20210227170006.5077-19-michael.christie@oracle.com
Tested-by: Laurence Oberman <loberman@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2021-02-27 10:59:59 -06:00 committed by Martin K. Petersen
parent 6ec29cb8ad
commit e0eb5d38b7
1 changed files with 8 additions and 11 deletions
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19
drivers/target/loopback/tcm_loop.c
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@ -67,8 +67,12 @@ static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
{
struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
struct tcm_loop_cmd, tl_se_cmd);
struct scsi_cmnd *sc = tl_cmd->sc;
kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
else
sc->scsi_done(sc);
}
static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
@ -164,7 +168,6 @@ static void tcm_loop_submission_work(struct work_struct *work)
return;
out_done:
kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
sc->scsi_done(sc);
}
@ -174,20 +177,14 @@ static void tcm_loop_submission_work(struct work_struct *work)
*/
static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
{
struct tcm_loop_cmd *tl_cmd;
struct tcm_loop_cmd *tl_cmd = scsi_cmd_priv(sc);
pr_debug("%s() %d:%d:%d:%llu got CDB: 0x%02x scsi_buf_len: %u\n",
__func__, sc->device->host->host_no, sc->device->id,
sc->device->channel, sc->device->lun, sc->cmnd[0],
scsi_bufflen(sc));
tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
if (!tl_cmd) {
set_host_byte(sc, DID_ERROR);
sc->scsi_done(sc);
return 0;
}
memset(tl_cmd, 0, sizeof(*tl_cmd));
tl_cmd->sc = sc;
tl_cmd->sc_cmd_tag = sc->request->tag;
INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
@ -319,6 +316,7 @@ static struct scsi_host_template tcm_loop_driver_template = {
.dma_boundary = PAGE_SIZE - 1,
.module = THIS_MODULE,
.track_queue_depth = 1,
.cmd_size = sizeof(struct tcm_loop_cmd),
};
static int tcm_loop_driver_probe(struct device *dev)
@ -579,7 +577,6 @@ static int tcm_loop_queue_data_or_status(const char *func,
if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
(se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
scsi_set_resid(sc, se_cmd->residual_count);
sc->scsi_done(sc);
return 0;
}