target: Add protection SGLs to target_submit_cmd_map_sgls

This patch adds support to target_submit_cmd_map_sgls() for
accepting 'sgl_prot' + 'sgl_prot_count' parameters for
DIF protection information.

Note the passed parameters are stored at se_cmd->t_prot_sg
and se_cmd->t_prot_nents respectively.

Also, update tcm_loop and vhost-scsi fabrics usage of
target_submit_cmd_map_sgls() to take into account the
new parameters.

Cc: 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>

diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index 763ee45..112b795 100644 (file)
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -217,7 +217,7 @@ 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);
+                       sgl_bidi, sgl_bidi_count, NULL, 0);
        if (rc < 0) {
                set_host_byte(sc, DID_NO_CONNECT);
                goto out_done;

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index fa4fc04..aebe0bb 100644 (file)
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1310,6 +1310,8 @@ transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
  * @sgl_count: scatterlist count for unidirectional mapping
  * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
  * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
+ * @sgl_prot: struct scatterlist memory protection information
+ * @sgl_prot_count: scatterlist count for protection information
  *
  * Returns non zero to signal active I/O shutdown failure.  All other
  * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
@@ -1322,7 +1324,8 @@ int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess
                unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
                u32 data_length, int task_attr, int data_dir, int flags,
                struct scatterlist *sgl, u32 sgl_count,
-               struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
+               struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
+               struct scatterlist *sgl_prot, u32 sgl_prot_count)
 {
        struct se_portal_group *se_tpg;
        sense_reason_t rc;
@@ -1364,6 +1367,14 @@ int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess
                target_put_sess_cmd(se_sess, se_cmd);
                return 0;
        }
+       /*
+        * Save pointers for SGLs containing protection information,
+        * if present.
+        */
+       if (sgl_prot_count) {
+               se_cmd->t_prot_sg = sgl_prot;
+               se_cmd->t_prot_nents = sgl_prot_count;
+       }
 
        rc = target_setup_cmd_from_cdb(se_cmd, cdb);
        if (rc != 0) {
@@ -1406,6 +1417,7 @@ int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess
                        return 0;
                }
        }
+
        /*
         * Check if we need to delay processing because of ALUA
         * Active/NonOptimized primary access state..
@@ -1445,7 +1457,7 @@ int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
 {
        return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
                        unpacked_lun, data_length, task_attr, data_dir,
-                       flags, NULL, 0, NULL, 0);
+                       flags, NULL, 0, NULL, 0, NULL, 0);
 }
 EXPORT_SYMBOL(target_submit_cmd);
 

diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index f175629..84488a8 100644 (file)
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -889,7 +889,7 @@ static void tcm_vhost_submission_work(struct work_struct *work)
                        cmd->tvc_lun, cmd->tvc_exp_data_len,
                        cmd->tvc_task_attr, cmd->tvc_data_direction,
                        TARGET_SCF_ACK_KREF, sg_ptr, cmd->tvc_sgl_count,
-                       sg_bidi_ptr, sg_no_bidi);
+                       sg_bidi_ptr, sg_no_bidi, NULL, 0);
        if (rc < 0) {
                transport_send_check_condition_and_sense(se_cmd,
                                TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);

diff --git a/include/target/target_core_fabric.h b/include/target/target_core_fabric.h
index 4cf4fda..0218d68 100644 (file)
--- a/include/target/target_core_fabric.h
+++ b/include/target/target_core_fabric.h
@@ -105,7 +105,8 @@ sense_reason_t transport_lookup_cmd_lun(struct se_cmd *, u32);
 sense_reason_t target_setup_cmd_from_cdb(struct se_cmd *, unsigned char *);
 int    target_submit_cmd_map_sgls(struct se_cmd *, struct se_session *,
                unsigned char *, unsigned char *, u32, u32, int, int, int,
-               struct scatterlist *, u32, struct scatterlist *, u32);
+               struct scatterlist *, u32, struct scatterlist *, u32,
+               struct scatterlist *, u32);
 int    target_submit_cmd(struct se_cmd *, struct se_session *, unsigned char *,
                unsigned char *, u32, u32, int, int, int);
 int    target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,