netdev - [PATCH net v2 5/6] net:ethernet:aquantia: Fix for multicast filter handling.

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Date:   Mon, 28 Aug 2017 21:52:12 +0300
From:   Pavel Belous <Pavel.Belous@...antia.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, David Arcari <darcari@...hat.com>,
        Igor Russkikh <Igor.Russkikh@...antia.com>,
        Nadezhda Krupnina <Nadezhda.Krupnina@...antia.com>,
        Simon Edelhaus <simon.edelhaus@...antia.com>
Subject: [PATCH net v2 5/6] net:ethernet:aquantia: Fix for multicast filter handling.

From: Igor Russkikh <Igor.Russkikh@...antia.com>

Since the HW supports up to 32 multicast filters we should
track count of multicast filters to avoid overflow.
If we attempt to add >32 multicast filter - just set NETIF_ALLMULTI flag
instead.

Fixes: 94f6c9e4cdf6 ("net: ethernet: aquantia: Support for NIC-specific code")
Signed-off-by: Igor Russkikh <Igor.Russkikh@...antia.com>
---
 drivers/net/ethernet/aquantia/atlantic/aq_nic.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
index dce17a5..6ac9e26 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
@@ -669,11 +669,26 @@ int aq_nic_set_multicast_list(struct aq_nic_s *self, struct net_device *ndev)
 	netdev_for_each_mc_addr(ha, ndev) {
 		ether_addr_copy(self->mc_list.ar[i++], ha->addr);
 		++self->mc_list.count;
+
+		if (i >= AQ_CFG_MULTICAST_ADDRESS_MAX)
+			break;
 	}
 
-	return self->aq_hw_ops.hw_multicast_list_set(self->aq_hw,
+	if (i >= AQ_CFG_MULTICAST_ADDRESS_MAX) {
+		/* Number of filters is too big: atlantic does not support this.
+		 * Force all multi filter to support this.
+		 * With this we disable all UC filters and setup "all pass"
+		 * multicast mask
+		 */
+		self->packet_filter |= IFF_ALLMULTI;
+		self->aq_hw->aq_nic_cfg->mc_list_count = 0;
+		return self->aq_hw_ops.hw_packet_filter_set(self->aq_hw,
+							self->packet_filter);
+	} else {
+		return self->aq_hw_ops.hw_multicast_list_set(self->aq_hw,
 						    self->mc_list.ar,
 						    self->mc_list.count);
+	}
 }
 
 int aq_nic_set_mtu(struct aq_nic_s *self, int new_mtu)
-- 
2.7.4