tcm_vhost: Convert I/O path to use target_submit_cmd_map_sgls
This patch converts tcm_vhost to use target_submit_cmd_map_sgls() for
I/O submission and mapping of pre-allocated SGL memory from incoming
virtio-scsi SGL memory -> se_cmd descriptors.
This includes removing the original open-coded fabric uses of target
core callers to support transport_generic_map_mem_to_cmd() between
target_setup_cmd_from_cdb() and transport_handle_cdb_direct() logic.
It also includes adding a handful of new tcm_vhost_cmnd member +
assignments in vhost_scsi_allocate_cmd() used from cmwq process
context I/O submission within tcm_vhost_submission_work()
(v2: Use renamed target_submit_cmd_map_sgls)
Reported-by: Christoph Hellwig <hch@lst.de>
Cc: Christoph Hellwig <hch@lst.de>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
index 89dc99b..aa31692 100644
--- a/drivers/vhost/tcm_vhost.c
+++ b/drivers/vhost/tcm_vhost.c
@@ -415,10 +415,7 @@
{
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) {
@@ -434,23 +431,11 @@
}
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;
}
@@ -549,37 +534,10 @@
{
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;
@@ -597,17 +555,19 @@
} else {
sg_ptr = NULL;
}
+ tv_nexus = tv_cmd->tvc_nexus;
- rc = transport_generic_map_mem_to_cmd(se_cmd, sg_ptr,
- tv_cmd->tvc_sgl_count, sg_bidi_ptr,
- sg_no_bidi);
+ 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)