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Commit ce48aa52 authored by Rui Sousa's avatar Rui Sousa Committed by Greg Kroah-Hartman
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net: fec: fix multicast filtering hardware setup 




[ 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: default avatarRui Sousa <rui.sousa@nxp.com>
Signed-off-by: default avatarFugang Duan <fugang.duan@nxp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ccf653b1

drivers/net/ethernet/freescale/fec_main.c

+9 −14
Original line number Diff line number Diff line
@@ -2793,6 +2793,7 @@ 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);
@@ -2815,11 +2816,7 @@ 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;
@@ -2837,16 +2834,14 @@ 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. */