From: Rui Sousa rui.sousa@nxp.com
This patch has been added to the stable tree. If you have any objections, please let us know.
===============
[ Upstream commit 01f8902bcf3ff124d0aeb88a774180ebcec20ace ]
Fix hardware setup of multicast address hash: - Never clear the hardware hash (to avoid packet loss) - Construct the hash register values in software and then write once to hardware
Signed-off-by: Rui Sousa rui.sousa@nxp.com Signed-off-by: Fugang Duan fugang.duan@nxp.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- drivers/net/ethernet/freescale/fec_main.c | 23 +++++++++-------------- 1 file changed, 9 insertions(+), 14 deletions(-)
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index 67aec18dd76c..fe5a7d207b1d 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -2850,6 +2850,7 @@ static void set_multicast_list(struct net_device *ndev) struct netdev_hw_addr *ha; unsigned int i, bit, data, crc, tmp; unsigned char hash; + unsigned int hash_high = 0, hash_low = 0;
if (ndev->flags & IFF_PROMISC) { tmp = readl(fep->hwp + FEC_R_CNTRL); @@ -2872,11 +2873,7 @@ static void set_multicast_list(struct net_device *ndev) return; }
- /* Clear filter and add the addresses in hash register - */ - writel(0, fep->hwp + FEC_GRP_HASH_TABLE_HIGH); - writel(0, fep->hwp + FEC_GRP_HASH_TABLE_LOW); - + /* Add the addresses in hash register */ netdev_for_each_mc_addr(ha, ndev) { /* calculate crc32 value of mac address */ crc = 0xffffffff; @@ -2894,16 +2891,14 @@ static void set_multicast_list(struct net_device *ndev) */ hash = (crc >> (32 - HASH_BITS)) & 0x3f;
- if (hash > 31) { - tmp = readl(fep->hwp + FEC_GRP_HASH_TABLE_HIGH); - tmp |= 1 << (hash - 32); - writel(tmp, fep->hwp + FEC_GRP_HASH_TABLE_HIGH); - } else { - tmp = readl(fep->hwp + FEC_GRP_HASH_TABLE_LOW); - tmp |= 1 << hash; - writel(tmp, fep->hwp + FEC_GRP_HASH_TABLE_LOW); - } + if (hash > 31) + hash_high |= 1 << (hash - 32); + else + hash_low |= 1 << hash; } + + writel(hash_high, fep->hwp + FEC_GRP_HASH_TABLE_HIGH); + writel(hash_low, fep->hwp + FEC_GRP_HASH_TABLE_LOW); }
/* Set a MAC change in hardware. */