[dpdk-stable] patch 'net/mlx5: fix probe failure report' has been queued to stable release 17.08.1

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to stable release 17.08.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/24/17. So please
shout if anyone has objections.

Thanks.

	--yliu

---
>From 2882817e044d61aaa1e66914d124acab9e162382 Mon Sep 17 00:00:00 2001
From: Matan Azrad <matan at mellanox.com>
Date: Sun, 13 Aug 2017 15:25:12 +0300
Subject: [PATCH] net/mlx5: fix probe failure report

[ upstream commit e1c3e30508e1c73697a78900cb9004edc83711af ]

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 mlx5
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.

This bug was already present in the original code taken from mlx4.

Fixes: 771fa900b73a ("mlx5: introduce new driver for Mellanox ConnectX-4 adapters")
Fixes: 1371f4df16bc ("mlx5: check port is configured as ethernet device")

Signed-off-by: Matan Azrad <matan at mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro at 6wind.com>
---
 drivers/net/mlx5/mlx5.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index b7e5046..508b799 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -586,8 +586,10 @@ mlx5_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 		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);
@@ -599,6 +601,7 @@ mlx5_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 		if (port_attr.link_layer != IBV_LINK_LAYER_ETHERNET) {
 			ERROR("port %d is not configured in Ethernet mode",
 			      port);
+			err = EINVAL;
 			goto port_error;
 		}
 
@@ -647,6 +650,7 @@ mlx5_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 		mlx5_args_assign(priv, &args);
 		if (ibv_exp_query_device(ctx, &exp_device_attr)) {
 			ERROR("ibv_exp_query_device() failed");
+			err = ENODEV;
 			goto port_error;
 		}
 
@@ -735,6 +739,7 @@ mlx5_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 		if (priv_get_mac(priv, &mac.addr_bytes)) {
 			ERROR("cannot get MAC address, is mlx5_en loaded?"
 			      " (errno: %s)", strerror(errno));
+			err = ENODEV;
 			goto port_error;
 		}
 		INFO("port %u MAC address is %02x:%02x:%02x:%02x:%02x:%02x",
-- 
2.7.4