[dpdk-dev] [PATCH] net/mlx4: fix probe failure report

[Matan Azrad <matan@mellanox.com>]

The corrupted code doesn't return error when probe function
fails due to error in device mac address getting.
By this way, the probe function may return success even if the
ETH dev is not allocated.

Hence, the probe caller, for example failsafe PMD, fails when it
tries to get ETH dev after the device was plugged out while mlx4
was probing it.

The fix adds error report to the probe caller when priv_get_mac fails
and in all other failure options which are missing it.

By this way, it prevents the unexpected behavior to miss ETH device
after the device was probed successfully.

Fixes: 7fae69eeff13 ("mlx4: new poll mode driver")
Fixes: 001a520e419f ("net/mlx4: add port parameter")
Fixes: 7b0661539229 ("mlx4: check if port is configured for ethernet")
Fixes: fec3608673e6 ("mlx4: query netdevice to get initial MAC address")

Signed-off-by: Matan Azrad <matan@mellanox.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Cc: stable@dpdk.org
---
 drivers/net/mlx4/mlx4.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index 94782c2..a94a42b 100644
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -6162,12 +6162,15 @@ struct txq_mp2mr_mbuf_check_data {
 	ibv_dev = list[i];
 
 	DEBUG("device opened");
-	if (ibv_query_device(attr_ctx, &device_attr))
+	if (ibv_query_device(attr_ctx, &device_attr)) {
+		err = ENODEV;
 		goto error;
+	}
 	INFO("%u port(s) detected", device_attr.phys_port_cnt);
 
 	if (mlx4_args(pci_dev->device.devargs, &conf)) {
 		ERROR("failed to process device arguments");
+		err = EINVAL;
 		goto error;
 	}
 	/* Use all ports when none are defined */
@@ -6201,19 +6204,23 @@ struct txq_mp2mr_mbuf_check_data {
 		DEBUG("using port %u (%08" PRIx32 ")", port, test);
 
 		ctx = ibv_open_device(ibv_dev);
-		if (ctx == NULL)
+		if (ctx == NULL) {
+			err = ENODEV;
 			goto port_error;
+		}
 
 		/* Check port status. */
 		err = ibv_query_port(ctx, port, &port_attr);
 		if (err) {
 			ERROR("port query failed: %s", strerror(err));
+			err = ENODEV;
 			goto port_error;
 		}
 
 		if (port_attr.link_layer != IBV_LINK_LAYER_ETHERNET) {
 			ERROR("port %d is not configured in Ethernet mode",
 			      port);
+			err = EINVAL;
 			goto port_error;
 		}
 
@@ -6250,6 +6257,7 @@ struct txq_mp2mr_mbuf_check_data {
 #ifdef HAVE_EXP_QUERY_DEVICE
 		if (ibv_exp_query_device(ctx, &exp_device_attr)) {
 			ERROR("ibv_exp_query_device() failed");
+			err = ENODEV;
 			goto port_error;
 		}
 #ifdef RSS_SUPPORT
@@ -6325,6 +6333,7 @@ struct txq_mp2mr_mbuf_check_data {
 		if (priv_get_mac(priv, &mac.addr_bytes)) {
 			ERROR("cannot get MAC address, is mlx4_en loaded?"
 			      " (errno: %s)", strerror(errno));
+			err = ENODEV;
 			goto port_error;
 		}
 		INFO("port %u MAC address is %02x:%02x:%02x:%02x:%02x:%02x",
-- 
1.8.3.1