net/mlx5: fix link speed info when link is down

When the link is down, the link speed returned by ethtool is
UINT32_MAX and the link status is 0.

In this case, the DPDK ethdev link speed should be set to
ETH_SPEED_NUM_NONE.
Otherwise since link speed is non-zero but link status is zero, this
is an inconsistent situation and -EAGAIN is returned, which is not right.

Fixes: 188408719888 ("net/mlx5: fix support for newer link speeds")
Cc: stable@dpdk.org
Signed-off-by: Xiaoyu Min <jackmin@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>

diff --git a/drivers/net/mlx5/mlx5_ethdev.c b/drivers/net/mlx5/mlx5_ethdev.c
index 9629cfb..33a32fc 100644 (file)
--- a/drivers/net/mlx5/mlx5_ethdev.c
+++ b/drivers/net/mlx5/mlx5_ethdev.c
@@ -908,7 +908,8 @@ mlx5_link_update_unlocked_gs(struct rte_eth_dev *dev,
                        dev->data->port_id, strerror(rte_errno));
                return ret;
        }
-       dev_link.link_speed = ecmd->speed;
+       dev_link.link_speed = (ecmd->speed == UINT32_MAX) ? ETH_SPEED_NUM_NONE :
+                                                           ecmd->speed;
        sc = ecmd->link_mode_masks[0] |
                ((uint64_t)ecmd->link_mode_masks[1] << 32);
        priv->link_speed_capa = 0;