Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending

Pull scsi target updates from Nicholas Bellinger:
 "Things have been calm for the most part with no new fabric drivers in
  flight for v3.7 (we're up to eight now !), so this update is primarily
  focused on addressing a few long-standing items within target-core and
  iscsi-target fabric code.

  The highlights include:

   - target: Simplify fabric sense data length handling (roland)
   - qla2xxx: Fix endianness of task management response code (roland)
   - target: fix truncation of mode data, support zero allocation length
     (paolo)
   - target: Properly support zero-length commands in normal processing
     path (paolo)
   - iscsi-target: Correctly set 0xffffffff field within ISCSI_OP_REJECT
     PDU (ronnie + nab)
   - iscsi-target: Add explicit set of cache_dynamic_acls=1 for TPG
     demo-mode (ronnie + nab)
   - target/file: Re-enable optional fd_buffered_io=1 operation (nab +
     hch)
   - iscsi-target: Add MaxXmitDataSegmenthLength forr target ->
     initiator MDRSL declaration (nab)
   - target: Add target_submit_cmd_map_sgls for SGL fabric memory
     passthrough (nab + hch)
   - tcm_loop: Convert I/O path to use target_submit_cmd_map_sgls (hch +
     nab)
   - tcm_vhost: Convert I/O path to use target_submit_cmd_map_sgls (nab
     + hch)

  The last series for adding a new target_submit_cmd_map_sgls() fabric
  caller (as requested by hch) that accepts pre-allocated SGL memory
  (using existing logic), along with converting tcm_loop + tcm_vhost has
  only been in -next for the last days, but has gotten enough review
  +testing and is clear enough a mechanical change that I think it's
  reasonable to merge for -rc1 code.

  Thanks again to everyone who contributed this round! Extra special
  thanks to Roland (PureStorage) for tracking down the qla2xxx target
  TMR response code endian issue, and to Paolo (Redhat) for resolving
  the long standing zero-length CDB issues within target-core between
  virtual and pSCSI backends."

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (44 commits)
  iscsi-target: Bump defaults for nopin_timeout + nopin_response_timeout values
  iscsit: proper endianess conversions
  iscsit: use the itt_t abstract type
  iscsit: add missing endianess conversion in iscsit_check_inaddr_any
  iscsit: remove incorrect unlock in iscsit_build_sendtargets_resp
  iscsit: mark various functions static
  target/iscsi: precedence bug in iscsit_set_dataout_sequence_values()
  target/usb-gadget: strlen() doesn't count the terminator
  target/usb-gadget: remove duplicate initialization
  tcm_vhost: Convert I/O path to use target_submit_cmd_map_sgls
  target: Add control CDB READ payload zero work-around
  tcm_loop: Convert I/O path to use target_submit_cmd_map_sgls
  target: Add target_submit_cmd_map_sgls for SGL fabric memory passthrough
  iscsi-target: Add explicit set of cache_dynamic_acls=1 for TPG demo-mode
  iscsi-target: Change iscsi_target_seq_pdu_list.c to honor MaxXmitDataSegmentLength
  iscsi-target: Add MaxXmitDataSegmentLength connection recovery check
  iscsi-target: Convert incoming PDU payload checks to MaxXmitDataSegmentLength
  iscsi-target: Enable MaxXmitDataSegmentLength operation in login path
  iscsi-target: Add base MaxXmitDataSegmentLength code
  target/file: Re-enable optional fd_buffered_io=1 operation
  ...

2 files changed, 22 insertions, 67 deletions

diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
index ed8e2e6..aa31692 100644
--- a/drivers/vhost/tcm_vhost.c
+++ b/drivers/vhost/tcm_vhost.c
@@ -330,17 +330,6 @@ static int tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
 	return 0;
 }
 
-static u16 tcm_vhost_set_fabric_sense_len(struct se_cmd *se_cmd,
-	u32 sense_length)
-{
-	return 0;
-}
-
-static u16 tcm_vhost_get_fabric_sense_len(void)
-{
-	return 0;
-}
-
 static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd)
 {
 	struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
@@ -426,10 +415,7 @@ static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
 {
 	struct tcm_vhost_cmd *tv_cmd;
 	struct tcm_vhost_nexus *tv_nexus;
-	struct se_portal_group *se_tpg = &tv_tpg->se_tpg;
 	struct se_session *se_sess;
-	struct se_cmd *se_cmd;
-	int sam_task_attr;
 
 	tv_nexus = tv_tpg->tpg_nexus;
 	if (!tv_nexus) {
@@ -445,23 +431,11 @@ static struct tcm_vhost_cmd *vhost_scsi_allocate_cmd(
 	}
 	INIT_LIST_HEAD(&tv_cmd->tvc_completion_list);
 	tv_cmd->tvc_tag = v_req->tag;
+	tv_cmd->tvc_task_attr = v_req->task_attr;
+	tv_cmd->tvc_exp_data_len = exp_data_len;
+	tv_cmd->tvc_data_direction = data_direction;
+	tv_cmd->tvc_nexus = tv_nexus;
 
-	se_cmd = &tv_cmd->tvc_se_cmd;
-	/*
-	 * Locate the SAM Task Attr from virtio_scsi_cmd_req
-	 */
-	sam_task_attr = v_req->task_attr;
-	/*
-	 * Initialize struct se_cmd descriptor from TCM infrastructure
-	 */
-	transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, exp_data_len,
-				data_direction, sam_task_attr,
-				&tv_cmd->tvc_sense_buf[0]);
-
-#if 0	/* FIXME: vhost_scsi_allocate_cmd() BIDI operation */
-	if (bidi)
-		se_cmd->se_cmd_flags |= SCF_BIDI;
-#endif
 	return tv_cmd;
 }
 
@@ -560,37 +534,10 @@ static void tcm_vhost_submission_work(struct work_struct *work)
 {
 	struct tcm_vhost_cmd *tv_cmd =
 		container_of(work, struct tcm_vhost_cmd, work);
+	struct tcm_vhost_nexus *tv_nexus;
 	struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
 	struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL;
 	int rc, sg_no_bidi = 0;
-	/*
-	 * Locate the struct se_lun pointer based on v_req->lun, and
-	 * attach it to struct se_cmd
-	 */
-	rc = transport_lookup_cmd_lun(&tv_cmd->tvc_se_cmd, tv_cmd->tvc_lun);
-	if (rc < 0) {
-		pr_err("Failed to look up lun: %d\n", tv_cmd->tvc_lun);
-		transport_send_check_condition_and_sense(&tv_cmd->tvc_se_cmd,
-			tv_cmd->tvc_se_cmd.scsi_sense_reason, 0);
-		transport_generic_free_cmd(se_cmd, 0);
-		return;
-	}
-
-	rc = target_setup_cmd_from_cdb(se_cmd, tv_cmd->tvc_cdb);
-	if (rc == -ENOMEM) {
-		transport_send_check_condition_and_sense(se_cmd,
-				TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
-		transport_generic_free_cmd(se_cmd, 0);
-		return;
-	} else if (rc < 0) {
-		if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
-			tcm_vhost_queue_status(se_cmd);
-		else
-			transport_send_check_condition_and_sense(se_cmd,
-					se_cmd->scsi_sense_reason, 0);
-		transport_generic_free_cmd(se_cmd, 0);
-		return;
-	}
 
 	if (tv_cmd->tvc_sgl_count) {
 		sg_ptr = tv_cmd->tvc_sgl;
@@ -608,17 +555,19 @@ static void tcm_vhost_submission_work(struct work_struct *work)
 	} else {
 		sg_ptr = NULL;
 	}
-
-	rc = transport_generic_map_mem_to_cmd(se_cmd, sg_ptr,
-				tv_cmd->tvc_sgl_count, sg_bidi_ptr,
-				sg_no_bidi);
+	tv_nexus = tv_cmd->tvc_nexus;
+
+	rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
+			tv_cmd->tvc_cdb, &tv_cmd->tvc_sense_buf[0],
+			tv_cmd->tvc_lun, tv_cmd->tvc_exp_data_len,
+			tv_cmd->tvc_task_attr, tv_cmd->tvc_data_direction,
+			0, sg_ptr, tv_cmd->tvc_sgl_count,
+			sg_bidi_ptr, sg_no_bidi);
 	if (rc < 0) {
 		transport_send_check_condition_and_sense(se_cmd,
-				se_cmd->scsi_sense_reason, 0);
+				TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
 		transport_generic_free_cmd(se_cmd, 0);
-		return;
 	}
-	transport_handle_cdb_direct(se_cmd);
 }
 
 static void vhost_scsi_handle_vq(struct vhost_scsi *vs)
@@ -1531,8 +1480,6 @@ static struct target_core_fabric_ops tcm_vhost_ops = {
 	.queue_data_in			= tcm_vhost_queue_data_in,
 	.queue_status			= tcm_vhost_queue_status,
 	.queue_tm_rsp			= tcm_vhost_queue_tm_rsp,
-	.get_fabric_sense_len		= tcm_vhost_get_fabric_sense_len,
-	.set_fabric_sense_len		= tcm_vhost_set_fabric_sense_len,
 	/*
 	 * Setup callers for generic logic in target_core_fabric_configfs.c
 	 */
diff --git a/drivers/vhost/tcm_vhost.h b/drivers/vhost/tcm_vhost.h
index d9e9355..7e87c63 100644
--- a/drivers/vhost/tcm_vhost.h
+++ b/drivers/vhost/tcm_vhost.h
@@ -5,6 +5,12 @@
 struct tcm_vhost_cmd {
 	/* Descriptor from vhost_get_vq_desc() for virt_queue segment */
 	int tvc_vq_desc;
+	/* virtio-scsi initiator task attribute */
+	int tvc_task_attr;
+	/* virtio-scsi initiator data direction */
+	enum dma_data_direction tvc_data_direction;
+	/* Expected data transfer length from virtio-scsi header */
+	u32 tvc_exp_data_len;
 	/* The Tag from include/linux/virtio_scsi.h:struct virtio_scsi_cmd_req */
 	u64 tvc_tag;
 	/* The number of scatterlists associated with this cmd */
@@ -17,6 +23,8 @@ struct tcm_vhost_cmd {
 	struct virtio_scsi_cmd_resp __user *tvc_resp;
 	/* Pointer to vhost_scsi for our device */
 	struct vhost_scsi *tvc_vhost;
+	/* Pointer to vhost nexus memory */
+	struct tcm_vhost_nexus *tvc_nexus;
 	/* The TCM I/O descriptor that is accessed via container_of() */
 	struct se_cmd tvc_se_cmd;
 	/* work item used for cmwq dispatch to tcm_vhost_submission_work() */