net: sun4i-emac: add promiscuous support

The sun4i-emac driver is rather primitive, and doesn't support
promiscuous mode. This makes usage such as bridging impossible,
which is a shame on virtualization capable HW such as the
Allwinner A20.

The fix is fairly simple: move the RX setup code to the ndo_set_rx_mode
vector, and add the required HW configuration when IFF_PROMISC is passed
by the core code.

This has been tested on a generic A20 box running a few virtual
machines hanging off a bridge with the EMAC chip as the link to the
outside world.

Cc: Stefan Roese <sr@denx.de>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Stefan Roese <sr@denx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 21 insertions, 9 deletions

diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
index fcaeeb8a4929..28460676b8ca 100644
--- a/drivers/net/ethernet/allwinner/sun4i-emac.c
+++ b/drivers/net/ethernet/allwinner/sun4i-emac.c
@@ -268,15 +268,6 @@ static unsigned int emac_setup(struct net_device *ndev)
         writel(reg_val | EMAC_TX_MODE_ABORTED_FRAME_EN,
                 db->membase + EMAC_TX_MODE_REG);
 
-        /* set up RX */
-        reg_val = readl(db->membase + EMAC_RX_CTL_REG);
-
-        writel(reg_val | EMAC_RX_CTL_PASS_LEN_OOR_EN |
-                EMAC_RX_CTL_ACCEPT_UNICAST_EN | EMAC_RX_CTL_DA_FILTER_EN |
-                EMAC_RX_CTL_ACCEPT_MULTICAST_EN |
-                EMAC_RX_CTL_ACCEPT_BROADCAST_EN,
-                db->membase + EMAC_RX_CTL_REG);
-
         /* set MAC */
         /* set MAC CTL0 */
         reg_val = readl(db->membase + EMAC_MAC_CTL0_REG);
@@ -309,6 +300,26 @@ static unsigned int emac_setup(struct net_device *ndev)
         return 0;
 }
 
+static void emac_set_rx_mode(struct net_device *ndev)
+{
+        struct emac_board_info *db = netdev_priv(ndev);
+        unsigned int reg_val;
+
+        /* set up RX */
+        reg_val = readl(db->membase + EMAC_RX_CTL_REG);
+
+        if (ndev->flags & IFF_PROMISC)
+                reg_val |= EMAC_RX_CTL_PASS_ALL_EN;
+        else
+                reg_val &= ~EMAC_RX_CTL_PASS_ALL_EN;
+
+        writel(reg_val | EMAC_RX_CTL_PASS_LEN_OOR_EN |
+                EMAC_RX_CTL_ACCEPT_UNICAST_EN | EMAC_RX_CTL_DA_FILTER_EN |
+                EMAC_RX_CTL_ACCEPT_MULTICAST_EN |
+                EMAC_RX_CTL_ACCEPT_BROADCAST_EN,
+                db->membase + EMAC_RX_CTL_REG);
+}
+
 static unsigned int emac_powerup(struct net_device *ndev)
 {
         struct emac_board_info *db = netdev_priv(ndev);
@@ -782,6 +793,7 @@ static const struct net_device_ops emac_netdev_ops = {
         .ndo_stop               = emac_stop,
         .ndo_start_xmit         = emac_start_xmit,
         .ndo_tx_timeout         = emac_timeout,
+        .ndo_set_rx_mode        = emac_set_rx_mode,
         .ndo_do_ioctl           = emac_ioctl,
         .ndo_change_mtu         = eth_change_mtu,
         .ndo_validate_addr      = eth_validate_addr,