[PATCH net-next v02 5/9] hinic3: Add msg_send_lock for message sending concurrecy

[Fan Gong]

  As send_mbox_msg is invoked by 3 functions: hinic3_send_mbox_to_mgmt,
hinic3_response_mbox_to_mgmt and hinic3_send_mbox_to_mgmt_no_ack, only
hinic3_response_mbox_to_mgmt does not has mutex and the other two has
mbox->mbox_send_lock because their send actions are mutually exclusive.
  As hinic3_response_mbox_to_mgmt does not conflict with them in send
actions but in mailbox resources, add the new mutex(msg_send_lock) in
send_mbox_msg to ensure message concurrency.

  Besdies, in mbox_send_seg change FIELD_PREP to FIELD_GET in
MBOX_STATUS_FINISHED and MBOX_STATUS_SUCCESS to be more reasonable.

Co-developed-by: Zhu Yikai <zhuyikai1@xxxxxxxxxxxxxx>
Signed-off-by: Zhu Yikai <zhuyikai1@xxxxxxxxxxxxxx>
Signed-off-by: Fan Gong <gongfan1@xxxxxxxxxx>
---
 drivers/net/ethernet/huawei/hinic3/hinic3_mbox.c | 9 +++++++--
 drivers/net/ethernet/huawei/hinic3/hinic3_mbox.h | 4 ++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/huawei/hinic3/hinic3_mbox.c b/drivers/net/ethernet/huawei/hinic3/hinic3_mbox.c
index c82370cf401d..51be726d9d2e 100644
--- a/drivers/net/ethernet/huawei/hinic3/hinic3_mbox.c
+++ b/drivers/net/ethernet/huawei/hinic3/hinic3_mbox.c
@@ -51,9 +51,9 @@
 #define MBOX_WB_STATUS_NOT_FINISHED      0x00
 
 #define MBOX_STATUS_FINISHED(wb)  \
-	((FIELD_PREP(MBOX_WB_STATUS_MASK, (wb))) != MBOX_WB_STATUS_NOT_FINISHED)
+	((FIELD_GET(MBOX_WB_STATUS_MASK, (wb))) != MBOX_WB_STATUS_NOT_FINISHED)
 #define MBOX_STATUS_SUCCESS(wb)  \
-	((FIELD_PREP(MBOX_WB_STATUS_MASK, (wb))) ==  \
+	((FIELD_GET(MBOX_WB_STATUS_MASK, (wb))) ==  \
 	MBOX_WB_STATUS_FINISHED_SUCCESS)
 #define MBOX_STATUS_ERRCODE(wb)  \
 	((wb) & MBOX_WB_ERROR_CODE_MASK)
@@ -396,6 +396,7 @@ static int hinic3_mbox_pre_init(struct hinic3_hwdev *hwdev,
 {
 	mbox->hwdev = hwdev;
 	mutex_init(&mbox->mbox_send_lock);
+	mutex_init(&mbox->mbox_seg_send_lock);
 	spin_lock_init(&mbox->mbox_lock);
 
 	mbox->workq = create_singlethread_workqueue(HINIC3_MBOX_WQ_NAME);
@@ -723,6 +724,8 @@ static int send_mbox_msg(struct hinic3_mbox *mbox, u8 mod, u16 cmd,
 	else
 		rsp_aeq_id = 0;
 
+	mutex_lock(&mbox->mbox_seg_send_lock);
+
 	if (dst_func == MBOX_MGMT_FUNC_ID &&
 	    !(hwdev->features[0] & MBOX_COMM_F_MBOX_SEGMENT)) {
 		err = mbox_prepare_dma_msg(mbox, ack_type, &dma_msg,
@@ -776,6 +779,8 @@ static int send_mbox_msg(struct hinic3_mbox *mbox, u8 mod, u16 cmd,
 	}
 
 err_send:
+	mutex_unlock(&mbox->mbox_seg_send_lock);
+
 	return err;
 }
 
diff --git a/drivers/net/ethernet/huawei/hinic3/hinic3_mbox.h b/drivers/net/ethernet/huawei/hinic3/hinic3_mbox.h
index e26f22d1d564..30de0c129503 100644
--- a/drivers/net/ethernet/huawei/hinic3/hinic3_mbox.h
+++ b/drivers/net/ethernet/huawei/hinic3/hinic3_mbox.h
@@ -114,6 +114,10 @@ struct hinic3_mbox {
 	struct hinic3_hwdev       *hwdev;
 	/* lock for send mbox message and ack message */
 	struct mutex              mbox_send_lock;
+	/* lock for send message transmission.
+	 * The lock hierarchy is mbox_send_lock -> mbox_seg_send_lock.
+	 */
+	struct mutex              mbox_seg_send_lock;
 	struct hinic3_send_mbox   send_mbox;
 	struct mbox_dma_queue     sync_msg_queue;
 	struct mbox_dma_queue     async_msg_queue;
-- 
2.43.0