sfc: add logs explaining XDP_TX/REDIRECT is not available

If it's not possible to allocate enough channels for XDP, XDP_TX and
XDP_REDIRECT don't work. However, only a message saying that not enough
channels were available was shown, but not saying what are the
consequences in that case. The user didn't know if he/she can use XDP
or not, if the performance is reduced, or what.

Signed-off-by: Íñigo Huguet <ihuguet@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/sfc/efx_channels.c b/drivers/net/ethernet/sfc/efx_channels.c
index bb48a13..e5b0d79 100644 (file)
--- a/drivers/net/ethernet/sfc/efx_channels.c
+++ b/drivers/net/ethernet/sfc/efx_channels.c
@@ -170,6 +170,8 @@ static int efx_allocate_msix_channels(struct efx_nic *efx,
                netif_err(efx, drv, efx->net_dev,
                          "Insufficient resources for %d XDP event queues (%d other channels, max %d)\n",
                          n_xdp_ev, n_channels, max_channels);
+               netif_err(efx, drv, efx->net_dev,
+                         "XDP_TX and XDP_REDIRECT will not work on this interface");
                efx->n_xdp_channels = 0;
                efx->xdp_tx_per_channel = 0;
                efx->xdp_tx_queue_count = 0;
@@ -177,6 +179,8 @@ static int efx_allocate_msix_channels(struct efx_nic *efx,
                netif_err(efx, drv, efx->net_dev,
                          "Insufficient resources for %d XDP TX queues (%d other channels, max VIs %d)\n",
                          n_xdp_tx, n_channels, efx->max_vis);
+               netif_err(efx, drv, efx->net_dev,
+                         "XDP_TX and XDP_REDIRECT will not work on this interface");
                efx->n_xdp_channels = 0;
                efx->xdp_tx_per_channel = 0;
                efx->xdp_tx_queue_count = 0;