tcm_loop: Enable DIF/DIX modes in SCSI host LLD

This patch updates tcm_loop_driver_probe() to set protection
information using scsi_host_set_prot() and scsi_host_set_guard(),
which currently enabled all modes of DIF/DIX protection, minus
DIX TYPE0.

Also, update tcm_loop_submission_work() to pass struct scsi_cmnd
related protection into target_submit_cmd_map_sgls() during CDB
dispatch.

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index 112b795a7b80..fadad7c5f635 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -217,7 +217,8 @@ static void tcm_loop_submission_work(struct work_struct *work)
                         scsi_bufflen(sc), tcm_loop_sam_attr(sc),
                         sc->sc_data_direction, 0,
                         scsi_sglist(sc), scsi_sg_count(sc),
-                        sgl_bidi, sgl_bidi_count, NULL, 0);
+                        sgl_bidi, sgl_bidi_count,
+                        scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
         if (rc < 0) {
                 set_host_byte(sc, DID_NO_CONNECT);
                 goto out_done;
@@ -462,7 +463,7 @@ static int tcm_loop_driver_probe(struct device *dev)
 {
         struct tcm_loop_hba *tl_hba;
         struct Scsi_Host *sh;
-        int error;
+        int error, host_prot;
 
         tl_hba = to_tcm_loop_hba(dev);
 
@@ -486,6 +487,13 @@ static int tcm_loop_driver_probe(struct device *dev)
         sh->max_channel = 0;
         sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN;
 
+        host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
+                    SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
+                    SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
+
+        scsi_host_set_prot(sh, host_prot);
+        scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
+
         error = scsi_add_host(sh, &tl_hba->dev);
         if (error) {
                 pr_err("%s: scsi_add_host failed\n", __func__);