[PATCH net-next 05/12] net: hns3: add hclge_cmd_check_retval() to parse comman's return value

[Huazhong Tan]

From: Weihang Li <liweih...@hisilicon.com>

For simplifying the code, this patch adds hclge_cmd_check_retval() to
check the return value of the command.

Also, according the IMP's description, when there are several descriptors
in a command, then the IMP will save the return value on the last
description, so hclge_cmd_check_retval() just check the last one for this
case.

Signed-off-by: Weihang Li <liweih...@hisilicon.com>
Signed-off-by: Peng Li <lipeng...@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazh...@huawei.com>
---
 .../hisilicon/hns3/hns3pf/hclge_cmd.c         | 60 ++++++++++---------
 1 file changed, 33 insertions(+), 27 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c 
b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c
index 81dbe1b6abb0..57c50b947857 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c
@@ -186,6 +186,38 @@ static bool hclge_is_special_opcode(u16 opcode)
        return false;
 }
 
+static int hclge_cmd_check_retval(struct hclge_hw *hw, struct hclge_desc *desc,
+                                 int num, int ntc)
+{
+       u16 opcode, desc_ret;
+       int handle;
+       int retval;
+
+       opcode = le16_to_cpu(desc[0].opcode);
+       for (handle = 0; handle < num; handle++) {
+               desc[handle] = hw->cmq.csq.desc[ntc];
+               ntc++;
+               if (ntc == hw->cmq.csq.desc_num)
+                       ntc = 0;
+       }
+       if (likely(!hclge_is_special_opcode(opcode)))
+               desc_ret = le16_to_cpu(desc[num - 1].retval);
+       else
+               desc_ret = le16_to_cpu(desc[0].retval);
+
+       if (desc_ret == HCLGE_CMD_EXEC_SUCCESS)
+               retval = 0;
+       else if (desc_ret == HCLGE_CMD_NO_AUTH)
+               retval = -EPERM;
+       else if (desc_ret == HCLGE_CMD_NOT_SUPPORTED)
+               retval = -EOPNOTSUPP;
+       else
+               retval = -EIO;
+       hw->cmq.last_status = desc_ret;
+
+       return retval;
+}
+
 /**
  * hclge_cmd_send - send command to command queue
  * @hw: pointer to the hw struct
@@ -203,7 +235,6 @@ int hclge_cmd_send(struct hclge_hw *hw, struct hclge_desc 
*desc, int num)
        u32 timeout = 0;
        int handle = 0;
        int retval = 0;
-       u16 opcode, desc_ret;
        int ntc;
 
        spin_lock_bh(&hw->cmq.csq.lock);
@@ -219,7 +250,6 @@ int hclge_cmd_send(struct hclge_hw *hw, struct hclge_desc 
*desc, int num)
         * which will be use for hardware to write back
         */
        ntc = hw->cmq.csq.next_to_use;
-       opcode = le16_to_cpu(desc[0].opcode);
        while (handle < num) {
                desc_to_use = &hw->cmq.csq.desc[hw->cmq.csq.next_to_use];
                *desc_to_use = desc[handle];
@@ -250,31 +280,7 @@ int hclge_cmd_send(struct hclge_hw *hw, struct hclge_desc 
*desc, int num)
        if (!complete) {
                retval = -EAGAIN;
        } else {
-               handle = 0;
-               while (handle < num) {
-                       /* Get the result of hardware write back */
-                       desc_to_use = &hw->cmq.csq.desc[ntc];
-                       desc[handle] = *desc_to_use;
-
-                       if (likely(!hclge_is_special_opcode(opcode)))
-                               desc_ret = le16_to_cpu(desc[handle].retval);
-                       else
-                               desc_ret = le16_to_cpu(desc[0].retval);
-
-                       if (desc_ret == HCLGE_CMD_EXEC_SUCCESS)
-                               retval = 0;
-                       else if (desc_ret == HCLGE_CMD_NO_AUTH)
-                               retval = -EPERM;
-                       else if (desc_ret == HCLGE_CMD_NOT_SUPPORTED)
-                               retval = -EOPNOTSUPP;
-                       else
-                               retval = -EIO;
-                       hw->cmq.last_status = desc_ret;
-                       ntc++;
-                       handle++;
-                       if (ntc == hw->cmq.csq.desc_num)
-                               ntc = 0;
-               }
+               retval = hclge_cmd_check_retval(hw, desc, num, ntc);
        }
 
        /* Clean the command send queue */
-- 
2.20.1