[RFC 04/11] iscsi-target: Add per transport iscsi_cmd alloc/free

["Nicholas A. Bellinger" <nab-IzHhD5pYlfBP7FQvKIMDCQ@public.gmane.org>]

From: Nicholas Bellinger <nab-IzHhD5pYlfBP7FQvKIMDCQ@public.gmane.org>

This patch converts struct iscsi_cmd memory allocation + free to use
->iscsit_alloc_cmd() + ->iscsit_free_cmd() iscsit_transport API caller,
and export iscsit_allocate_cmd() + iscsit_free_cmd() symbols

Also update iscsit_free_cmd() to include a final ->iscsit_unmap_cmd()
API call.

Signed-off-by: Nicholas Bellinger <nab-IzHhD5pYlfBP7FQvKIMDCQ@public.gmane.org>
---
 drivers/target/iscsi/iscsi_target.c      |    2 +
 drivers/target/iscsi/iscsi_target_util.c |   34 ++++++++++++++++++++++++++---
 drivers/target/iscsi/iscsi_target_util.h |    2 +
 3 files changed, 34 insertions(+), 4 deletions(-)

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 4dc1c9b..9cd7b7b 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -488,6 +488,8 @@ static struct iscsit_transport iscsi_target_transport = {
 	.iscsit_setup_np	= iscsit_setup_np,
 	.iscsit_accept_np	= iscsit_accept_np,
 	.iscsit_free_np		= iscsit_free_np,
+	.iscsit_alloc_cmd	= iscsit_alloc_cmd,
+	.iscsit_free_cmd	= iscsit_cache_free_cmd,
 	.iscsit_get_login_rx	= iscsit_get_login_rx,
 	.iscsit_put_login_tx	= iscsit_put_login_tx,
 };
diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c
index 4cf1e7f..4a86034 100644
--- a/drivers/target/iscsi/iscsi_target_util.c
+++ b/drivers/target/iscsi/iscsi_target_util.c
@@ -149,6 +149,17 @@ void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
 	spin_unlock_bh(&cmd->r2t_lock);
 }
 
+struct iscsi_cmd *iscsit_alloc_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
+{
+	struct iscsi_cmd *cmd;
+
+	cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask);
+	if (!cmd)
+		return NULL;
+
+	return cmd;
+}
+
 /*
  * May be called from software interrupt (timer) context for allocating
  * iSCSI NopINs.
@@ -157,13 +168,12 @@ struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
 {
 	struct iscsi_cmd *cmd;
 
-	cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask);
+	cmd = conn->conn_transport->iscsit_alloc_cmd(conn, gfp_mask);
 	if (!cmd) {
 		pr_err("Unable to allocate memory for struct iscsi_cmd.\n");
 		return NULL;
 	}
-
-	cmd->conn	= conn;
+	cmd->conn = conn;
 	INIT_LIST_HEAD(&cmd->i_conn_node);
 	INIT_LIST_HEAD(&cmd->datain_list);
 	INIT_LIST_HEAD(&cmd->cmd_r2t_list);
@@ -176,6 +186,7 @@ struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
 
 	return cmd;
 }
+EXPORT_SYMBOL(iscsit_allocate_cmd);
 
 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
 	struct iscsi_cmd *cmd,
@@ -661,6 +672,11 @@ void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
 	spin_unlock_bh(&conn->response_queue_lock);
 }
 
+void iscsit_cache_free_cmd(struct iscsi_cmd *cmd)
+{
+	kmem_cache_free(lio_cmd_cache, cmd);
+}
+
 void iscsit_release_cmd(struct iscsi_cmd *cmd)
 {
 	struct iscsi_conn *conn = cmd->conn;
@@ -679,17 +695,26 @@ void iscsit_release_cmd(struct iscsi_cmd *cmd)
 		iscsit_remove_cmd_from_response_queue(cmd, conn);
 	}
 
-	kmem_cache_free(lio_cmd_cache, cmd);
+	conn->conn_transport->iscsit_free_cmd(cmd);
 }
 
 void iscsit_free_cmd(struct iscsi_cmd *cmd)
 {
+	struct iscsi_conn *conn = cmd->conn;
 	/*
 	 * Determine if a struct se_cmd is associated with
 	 * this struct iscsi_cmd.
 	 */
 	switch (cmd->iscsi_opcode) {
 	case ISCSI_OP_SCSI_CMD:
+		if (cmd->data_direction == DMA_TO_DEVICE)
+			iscsit_stop_dataout_timer(cmd);
+
+		if (conn->conn_transport->iscsit_unmap_cmd)
+			conn->conn_transport->iscsit_unmap_cmd(cmd, conn);
+		/*
+		 * Fallthrough
+		 */
 	case ISCSI_OP_SCSI_TMFUNC:
 		transport_generic_free_cmd(&cmd->se_cmd, 1);
 		break;
@@ -709,6 +734,7 @@ void iscsit_free_cmd(struct iscsi_cmd *cmd)
 		break;
 	}
 }
+EXPORT_SYMBOL(iscsit_free_cmd);
 
 int iscsit_check_session_usage_count(struct iscsi_session *sess)
 {
diff --git a/drivers/target/iscsi/iscsi_target_util.h b/drivers/target/iscsi/iscsi_target_util.h
index 894d0f8..854ce89 100644
--- a/drivers/target/iscsi/iscsi_target_util.h
+++ b/drivers/target/iscsi/iscsi_target_util.h
@@ -8,6 +8,7 @@ extern struct iscsi_r2t *iscsit_get_r2t_for_eos(struct iscsi_cmd *, u32, u32);
 extern struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *);
 extern void iscsit_free_r2t(struct iscsi_r2t *, struct iscsi_cmd *);
 extern void iscsit_free_r2ts_from_list(struct iscsi_cmd *);
+extern struct iscsi_cmd *iscsit_alloc_cmd(struct iscsi_conn *, gfp_t);
 extern struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *, gfp_t);
 extern struct iscsi_seq *iscsit_get_seq_holder_for_datain(struct iscsi_cmd *, u32);
 extern struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *);
@@ -27,6 +28,7 @@ extern struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_c
 extern void iscsit_remove_cmd_from_tx_queues(struct iscsi_cmd *, struct iscsi_conn *);
 extern bool iscsit_conn_all_queues_empty(struct iscsi_conn *);
 extern void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *);
+extern void iscsit_cache_free_cmd(struct iscsi_cmd *);
 extern void iscsit_release_cmd(struct iscsi_cmd *);
 extern void iscsit_free_cmd(struct iscsi_cmd *);
 extern int iscsit_check_session_usage_count(struct iscsi_session *);
-- 
1.7.2.5

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