sfc: implement ethtool get/set RX ring size for EF100 reps

It's not truly a ring, but the maximum length of the list of queued RX
 SKBs is analogous to an RX ring size, so use that API to configure it.

Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/sfc/ef100_rep.c b/drivers/net/ethernet/sfc/ef100_rep.c
index eac9327..73ae465 100644 (file)
--- a/drivers/net/ethernet/sfc/ef100_rep.c
+++ b/drivers/net/ethernet/sfc/ef100_rep.c
@@ -150,10 +150,37 @@ static void efx_ef100_rep_ethtool_set_msglevel(struct net_device *net_dev,
        efv->msg_enable = msg_enable;
 }
 
+static void efx_ef100_rep_ethtool_get_ringparam(struct net_device *net_dev,
+                                               struct ethtool_ringparam *ring,
+                                               struct kernel_ethtool_ringparam *kring,
+                                               struct netlink_ext_ack *ext_ack)
+{
+       struct efx_rep *efv = netdev_priv(net_dev);
+
+       ring->rx_max_pending = U32_MAX;
+       ring->rx_pending = efv->rx_pring_size;
+}
+
+static int efx_ef100_rep_ethtool_set_ringparam(struct net_device *net_dev,
+                                              struct ethtool_ringparam *ring,
+                                              struct kernel_ethtool_ringparam *kring,
+                                              struct netlink_ext_ack *ext_ack)
+{
+       struct efx_rep *efv = netdev_priv(net_dev);
+
+       if (ring->rx_mini_pending || ring->rx_jumbo_pending || ring->tx_pending)
+               return -EINVAL;
+
+       efv->rx_pring_size = ring->rx_pending;
+       return 0;
+}
+
 static const struct ethtool_ops efx_ef100_rep_ethtool_ops = {
        .get_drvinfo            = efx_ef100_rep_get_drvinfo,
        .get_msglevel           = efx_ef100_rep_ethtool_get_msglevel,
        .set_msglevel           = efx_ef100_rep_ethtool_set_msglevel,
+       .get_ringparam          = efx_ef100_rep_ethtool_get_ringparam,
+       .set_ringparam          = efx_ef100_rep_ethtool_set_ringparam,
 };
 
 static struct efx_rep *efx_ef100_rep_create_netdev(struct efx_nic *efx,