DIF Type 2 drives require 32-byte commands. Add a suitable flag to
struct scsi_device that will cause scsi_setup_fs_cmnd() to allocate a
bigger command buffer.
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
---
drivers/scsi/scsi_lib.c | 36 +++++++++++++++++++++++++++++++++++-
include/scsi/scsi.h | 1 +
include/scsi/scsi_device.h | 1 +
3 files changed, 37 insertions(+), 1 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 662024d..fc752b5 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -67,6 +67,9 @@ static struct scsi_host_sg_pool scsi_sg_pools[] = {
struct kmem_cache *scsi_sdb_cache;
+struct kmem_cache *cdb_cache;
+mempool_t *cdb_pool;
+
static void scsi_run_queue(struct request_queue *q);
/*
@@ -642,6 +645,10 @@ static void __scsi_release_buffers(struct scsi_cmnd *cmd, int do_bidi_check)
if (scsi_prot_sg_count(cmd))
scsi_free_sgtable(cmd->prot_sdb);
+
+ if (cmd->cmd_len == SCSI_EXT_CDB_SIZE)
+ mempool_free(cmd->cmnd, cdb_pool);
+
}
/*
@@ -1109,7 +1116,18 @@ int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
if (unlikely(!cmd))
return BLKPREP_DEFER;
- memset(cmd->cmnd, 0, BLK_MAX_CDB);
+ if (sdev->use_32_for_rw) {
+ req->cmd = mempool_alloc(cdb_pool, GFP_ATOMIC);
+
+ if (unlikely(!req->cmd))
+ return BLKPREP_DEFER;
+
+ cmd->cmnd = req->cmd;
+ cmd->cmd_len = req->cmd_len = SCSI_EXT_CDB_SIZE;
+ memset(cmd->cmnd, 0, cmd->cmd_len);
+ } else
+ memset(cmd->cmnd, 0, BLK_MAX_CDB);
+
return scsi_init_io(cmd, GFP_ATOMIC);
}
EXPORT_SYMBOL(scsi_setup_fs_cmnd);
@@ -1745,6 +1763,19 @@ int __init scsi_init_queue(void)
}
}
+ cdb_cache = kmem_cache_create("scsi_cdb_32", SCSI_EXT_CDB_SIZE,
+ 0, 0, NULL);
+ if (!cdb_cache) {
+ printk(KERN_ERR "SCSI: can't init scsi cdb cache\n");
+ goto cleanup_sdb;
+ }
+
+ cdb_pool = mempool_create_slab_pool(SG_MEMPOOL_SIZE, cdb_cache);
+ if (!cdb_pool) {
+ printk(KERN_ERR "SCSI: can't init scsi cdb pool\n");
+ goto cleanup_sdb;
+ }
+
return 0;
cleanup_sdb:
@@ -1771,6 +1802,9 @@ void scsi_exit_queue(void)
mempool_destroy(sgp->pool);
kmem_cache_destroy(sgp->slab);
}
+
+ mempool_destroy(cdb_pool);
+ kmem_cache_destroy(cdb_cache);
}
/**
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 084478e..a7ae10a 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -138,6 +138,7 @@ struct scsi_cmnd;
* SCSI command lengths
*/
+#define SCSI_EXT_CDB_SIZE 32
#define SCSI_MAX_VARLEN_CDB_SIZE 260
/* defined in T10 SCSI Primary Commands-2 (SPC2) */
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 3f566af..de2966b 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -129,6 +129,7 @@ struct scsi_device {
* this device */
unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
* because we did a bus reset. */
+ unsigned use_32_for_rw:1; /* use 32-byte read / write (DIF Type 2) */
unsigned use_10_for_rw:1; /* first try 10-byte read / write */
unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
--
1.6.0.6
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
