[PATCH net-next v8 1/3] gve: skip error logging for retryable AdminQ commands

[Harshitha Ramamurthy <hramamurthy@google.com>]

From: Jordan Rhee <jordanrhee@google.com>

AdminQ commands may return -EAGAIN under certain transient conditions.
These commands are intended to be retried by the driver, so logging
a formal error to the system log is misleading and creates
unnecessary noise.

Modify the logging logic to skip the error message when the result
is -EAGAIN, and move logging to dev_err_ratelimited() to avoid
spamming the log.

Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Joshua Washington <joshwash@google.com>
Signed-off-by: Jordan Rhee <jordanrhee@google.com>
Signed-off-by: Harshitha Ramamurthy <hramamurthy@google.com>
---
Changes in v8:
- Fixed opcode extraction for extended commands (Sashiko)

Changes in v7:
- fixed type of err to be int instead of u32 (Sashiko)
- Picked up Jake Keller's review tag

Changes in v4:
- call out change to dev_err_ratelimited() in the commit message (Jacob Keller)
- remove extra print when adminQ status is GVE_ADMINQ_COMMAND_UNSET (Jacob Keller)
---
---
 drivers/net/ethernet/google/gve/gve_adminq.c | 41 ++++++++++++++++----
 1 file changed, 33 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/google/gve/gve_adminq.c b/drivers/net/ethernet/google/gve/gve_adminq.c
index 08587bf40ed4..0d5a67523cba 100644
--- a/drivers/net/ethernet/google/gve/gve_adminq.c
+++ b/drivers/net/ethernet/google/gve/gve_adminq.c
@@ -416,16 +416,10 @@ static bool gve_adminq_wait_for_cmd(struct gve_priv *priv, u32 prod_cnt)
 
 static int gve_adminq_parse_err(struct gve_priv *priv, u32 status)
 {
-	if (status != GVE_ADMINQ_COMMAND_PASSED &&
-	    status != GVE_ADMINQ_COMMAND_UNSET) {
-		dev_err(&priv->pdev->dev, "AQ command failed with status %d\n", status);
-		priv->adminq_cmd_fail++;
-	}
 	switch (status) {
 	case GVE_ADMINQ_COMMAND_PASSED:
 		return 0;
 	case GVE_ADMINQ_COMMAND_UNSET:
-		dev_err(&priv->pdev->dev, "parse_aq_err: err and status both unset, this should not be possible.\n");
 		return -EINVAL;
 	case GVE_ADMINQ_COMMAND_ERROR_ABORTED:
 	case GVE_ADMINQ_COMMAND_ERROR_CANCELLED:
@@ -455,6 +449,27 @@ static int gve_adminq_parse_err(struct gve_priv *priv, u32 status)
 	}
 }
 
+static bool gve_adminq_is_retryable(enum gve_adminq_opcodes opcode)
+{
+	switch (opcode) {
+	case GVE_ADMINQ_REPORT_NIC_TIMESTAMP:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static enum gve_adminq_opcodes gve_extract_opcode(union gve_adminq_command *cmd)
+{
+	u32 opcode;
+
+	opcode = be32_to_cpu(READ_ONCE(cmd->opcode));
+	if (opcode == GVE_ADMINQ_EXTENDED_COMMAND)
+		opcode = be32_to_cpu(cmd->extended_command.inner_opcode);
+
+	return opcode;
+}
+
 /* Flushes all AQ commands currently queued and waits for them to complete.
  * If there are failures, it will return the first error.
  */
@@ -477,14 +492,24 @@ static int gve_adminq_kick_and_wait(struct gve_priv *priv)
 
 	for (i = tail; i < head; i++) {
 		union gve_adminq_command *cmd;
-		u32 status, err;
+		u32 status;
+		int err;
 
 		cmd = &priv->adminq[i & priv->adminq_mask];
 		status = be32_to_cpu(READ_ONCE(cmd->status));
 		err = gve_adminq_parse_err(priv, status);
-		if (err)
+		if (err) {
+			enum gve_adminq_opcodes opcode = gve_extract_opcode(cmd);
+
+			priv->adminq_cmd_fail++;
+			if (!gve_adminq_is_retryable(opcode) || err != -EAGAIN)
+				dev_err_ratelimited(&priv->pdev->dev,
+						    "AQ command %d failed with status %d\n",
+						    opcode, status);
+
 			// Return the first error if we failed.
 			return err;
+		}
 	}
 
 	return 0;
-- 
2.54.0.563.g4f69b47b94-goog