net/mlx5e: Properly get the PF number phys port name ndo

Currently, we fail to retrieve the PF number in some cases (e.g
single ported cards, lag capability), this further results in a
call trace issued by the rtnetlink code, since the error value
is not -EOPNOTSUPP. Change the implementation to be independent
from the lag code and function properly on both two ports and
single ported cards.

Call Trace:

[  194.525057] mlx5_core 0000:82:00.0: mlx5_lag_get_pf_num:605:(pid 837): no lag device, can't get pf num
[  194.525804] WARNING: CPU: 7 PID: 837 at net/core/rtnetlink.c:3457 rtmsg_ifinfo_build_skb+0x131/0x160
[  194.529952] CPU: 7 PID: 837 Comm: kworker/7:3 Tainted: G        W  O      5.0.0-rc7+ #3
[  194.531307] Workqueue: events linkwatch_event
[  194.531697] RIP: 0010:rtmsg_ifinfo_build_skb+0x131/0x160
[  194.545007] Call Trace:
[  194.545406]  rtmsg_ifinfo_event.part.29+0x1b/0xb0
[  194.545810]  rtmsg_ifinfo+0x51/0x80
[  194.546209]  netdev_state_change+0xc7/0x110
[  194.546608]  ? dev_valid_name+0x1b0/0x1b0
[  194.547010]  ? __local_bh_enable_ip+0xef/0x1d0
[  194.547411]  ? lockdep_hardirqs_on+0x3ea/0x560
[  194.547811]  ? linkwatch_do_dev+0x9b/0x100
[  194.548207]  linkwatch_do_dev+0x9b/0x100
[  194.548605]  __linkwatch_run_queue+0x244/0x430
[  194.549014]  ? linkwatch_schedule_work+0x100/0x100
[  194.549412]  ? lock_acquire+0x10f/0x2d0
[  194.549816]  linkwatch_event+0x3f/0x50
[  194.550212]  process_one_work+0x7d3/0x1460

Fixes: c12ecc2 ("net/mlx5e: Move to use common phys port names for vport representors")
Signed-off-by: Roi Dayan <roid@mellanox.com>
Acked-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/en_rep.c

@@ -1129,16 +1129,17 @@ static int mlx5e_rep_get_phys_port_name(struct net_device *dev,
 	struct mlx5e_priv *priv = netdev_priv(dev);
 	struct mlx5e_rep_priv *rpriv = priv->ppriv;
 	struct mlx5_eswitch_rep *rep = rpriv->rep;
-	int ret, pf_num;
+	unsigned int fn;
+	int ret;
 
-	ret = mlx5_lag_get_pf_num(priv->mdev, &pf_num);
-	if (ret)
-		return ret;
+	fn = PCI_FUNC(priv->mdev->pdev->devfn);
+	if (fn >= MLX5_MAX_PORTS)
+		return -EOPNOTSUPP;
 
 	if (rep->vport == MLX5_VPORT_UPLINK)
-		ret = snprintf(buf, len, "p%d", pf_num);
+		ret = snprintf(buf, len, "p%d", fn);
 	else
-		ret = snprintf(buf, len, "pf%dvf%d", pf_num, rep->vport - 1);
+		ret = snprintf(buf, len, "pf%dvf%d", fn, rep->vport - 1);
 
 	if (ret >= len)
 		return -EOPNOTSUPP;