net: ethernet: stmmac: Disable hardware multicast filter

The IPQ806x does not appear to have a functional multicast ethernet
address filter. This was observed as a failure to correctly receive IPv6
packets on a LAN to the all stations address. Checking the vendor driver
shows that it does not attempt to enable the multicast filter and
instead falls back to receiving all multicast packets, internally
setting ALLMULTI.

Use the new fallback support in the dwmac1000 driver to correctly
achieve the same with the mainline IPQ806x driver. Confirmed to fix IPv6
functionality on an RB3011 router.

Cc: stable@vger.kernel.org
Signed-off-by: Jonathan McDowell <noodles@earth.li>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
index 02102c781a8cf4d786cf6b3f12981c63ddcc1f93..bf3250e0e59ca57a8b8d2b4058f12b9f0594dfb5 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
@@ -351,6 +351,7 @@ static int ipq806x_gmac_probe(struct platform_device *pdev)
        plat_dat->has_gmac = true;
        plat_dat->bsp_priv = gmac;
        plat_dat->fix_mac_speed = ipq806x_gmac_fix_mac_speed;
+       plat_dat->multicast_filter_bins = 0;
 
        err = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
        if (err)