[dpdk-dev] [PATCH v2] net/iavf: fix PF returning error

[Alvin Zhang <alvinx.zhang@intel.com>]

When the command sent by VF to PF fails, iavf may need to run
different code paths according to the specific reason of the
failure (not supported or other reasons).

This patch adds support of identifying PF return error type.

Fixes: 22b123a36d07 ("net/avf: initialize PMD")
Cc: stable@dpdk.org

Signed-off-by: Alvin Zhang <alvinx.zhang@intel.com>
---

v2: Refine codes according to comments.
---
 drivers/net/iavf/iavf.h       |  4 ++--
 drivers/net/iavf/iavf_vchnl.c | 18 ++++++++++++------
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/net/iavf/iavf.h b/drivers/net/iavf/iavf.h
index d1ae5a3..4a2e203 100644
--- a/drivers/net/iavf/iavf.h
+++ b/drivers/net/iavf/iavf.h
@@ -144,7 +144,7 @@ struct iavf_info {
 	uint64_t supported_rxdid;
 	uint8_t *proto_xtr; /* proto xtr type for all queues */
 	volatile enum virtchnl_ops pend_cmd; /* pending command not finished */
-	uint32_t cmd_retval; /* return value of the cmd response from PF */
+	int cmd_retval; /* return value of the cmd response from PF */
 	uint8_t *aq_resp; /* buffer to store the adminq response from PF */
 
 	/* Event from pf */
@@ -264,7 +264,7 @@ struct iavf_cmd_info {
  * _atomic_set_cmd successfully.
  */
 static inline void
-_notify_cmd(struct iavf_info *vf, uint32_t msg_ret)
+_notify_cmd(struct iavf_info *vf, int msg_ret)
 {
 	vf->cmd_retval = msg_ret;
 	rte_wmb();
diff --git a/drivers/net/iavf/iavf_vchnl.c b/drivers/net/iavf/iavf_vchnl.c
index 45096cb..f2b46f1 100644
--- a/drivers/net/iavf/iavf_vchnl.c
+++ b/drivers/net/iavf/iavf_vchnl.c
@@ -228,13 +228,19 @@
 			rte_delay_ms(ASQ_DELAY_MS);
 			/* If don't read msg or read sys event, continue */
 		} while (i++ < MAX_TRY_TIMES);
-		/* If there's no response is received, clear command */
-		if (i >= MAX_TRY_TIMES  ||
-		    vf->cmd_retval != VIRTCHNL_STATUS_SUCCESS) {
-			err = -1;
-			PMD_DRV_LOG(ERR, "No response or return failure (%d)"
-				    " for cmd %d", vf->cmd_retval, args->ops);
+
+		if (i >= MAX_TRY_TIMES) {
+			PMD_DRV_LOG(ERR, "No response for cmd %d", args->ops);
 			_clear_cmd(vf);
+			err = -EIO;
+		} else if (vf->cmd_retval ==
+			   VIRTCHNL_STATUS_ERR_NOT_SUPPORTED) {
+			PMD_DRV_LOG(ERR, "Cmd %d not supported", args->ops);
+			err = -ENOTSUP;
+		} else if (vf->cmd_retval != VIRTCHNL_STATUS_SUCCESS) {
+			PMD_DRV_LOG(ERR, "Return failure %d for cmd %d",
+				    vf->cmd_retval, args->ops);
+			err = -EINVAL;
 		}
 		break;
 	}
-- 
1.8.3.1