[dpdk-dev] [PATCH 5/7] regex/mlx5: improve error messages in RXP rules flush

[Michael Baum <michaelba@nvidia.com>]

During the rules flush, the rxp_poll_csr_for_value function is called
twice. The rxp_poll_csr_for_value function can fail for two reasons:
1. It could not read the value from register, in which case the
function returns -1.
2. It read a value, but not the value it expected to receive. In this
case it returns -EBUZY.

When the function fails it prints an error message that is relevant only
for a second type of failure. Moreover, for failure of the first type it
prints a value of an uninitialized variable.
In case of success, the function prints a debug message about the number
of cycles it took. This line was probably copied by mistake, since the
variable it reads from, is always equal to 0 and is not an indicator of
the number of cycles.

Remove the incorrect line about the cycles, and reduce the error print
only for the relevant error.

Fixes: b34d816363b5 ("regex/mlx5: support rules import")
Cc: stable@dpdk.org

Signed-off-by: Michael Baum <michaelba@nvidia.com>
Acked-by: Ori Kam <orika@nvidia.com>
---
 drivers/regex/mlx5/mlx5_rxp.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/regex/mlx5/mlx5_rxp.c b/drivers/regex/mlx5/mlx5_rxp.c
index ba78cc0..fcbc766 100644
--- a/drivers/regex/mlx5/mlx5_rxp.c
+++ b/drivers/regex/mlx5/mlx5_rxp.c
@@ -179,12 +179,14 @@
 				     count, ~0,
 				     MLX5_RXP_POLL_CSR_FOR_VALUE_TIMEOUT, id);
 	if (ret < 0) {
-		DRV_LOG(ERR, "Rules not rx by RXP: credit: %d, depth: %d", val,
-			fifo_depth);
+		if (ret == -EBUSY)
+			DRV_LOG(ERR, "Rules not rx by RXP: credit: %d, depth:"
+				" %d", val, fifo_depth);
+		else
+			DRV_LOG(ERR, "CSR poll failed, can't read value!");
 		return ret;
 	}
 	DRV_LOG(DEBUG, "RTRU FIFO depth: 0x%x", fifo_depth);
-	DRV_LOG(DEBUG, "Rules flush took %d cycles.", ret);
 	ret = mlx5_devx_regex_register_read(ctx, id, MLX5_RXP_RTRU_CSR_CTRL,
 					    &val);
 	if (ret) {
@@ -203,10 +205,12 @@
 				     MLX5_RXP_RTRU_CSR_STATUS_UPDATE_DONE,
 				     MLX5_RXP_POLL_CSR_FOR_VALUE_TIMEOUT, id);
 	if (ret < 0) {
-		DRV_LOG(ERR, "Rules update timeout: 0x%08X", val);
+		if (ret == -EBUSY)
+			DRV_LOG(ERR, "Rules update timeout: 0x%08X", val);
+		else
+			DRV_LOG(ERR, "CSR poll failed, can't read value!");
 		return ret;
 	}
-	DRV_LOG(DEBUG, "Rules update took %d cycles", ret);
 	if (mlx5_devx_regex_register_read(ctx, id, MLX5_RXP_RTRU_CSR_CTRL,
 					  &val)) {
 		DRV_LOG(ERR, "CSR read failed!");
@@ -215,7 +219,7 @@
 	val &= ~(MLX5_RXP_RTRU_CSR_CTRL_GO);
 	if (mlx5_devx_regex_register_write(ctx, id, MLX5_RXP_RTRU_CSR_CTRL,
 					   val)) {
-		DRV_LOG(ERR, "CSR write write failed!");
+		DRV_LOG(ERR, "CSR write failed!");
 		return -1;
 	}
 
-- 
1.8.3.1