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r8169: Add software counter for multicast packages 

The multicast hardware counter on 8168/8111 chips is only 32 bit while the
statistics in struct rtnl_link_stats64 are 64 bit.  Given that statistics
are requested on an irregular basis, an overflow of the hardware counter
can go unnoticed.  To count even very large numbers of multicast packets
reliably, add a software counter and remove previously applied code to
fill the multicast field requested by @rtl8169_get_stats64 with the values
read from the rx_multicast hardware counter.

Signed-off-by: Corinna Vinschen <vinschen@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Corinna Vinschen 2015-08-27 17:11:48 +02:00 committed by David S. Miller
parent 0d36938bb8
commit d7d2d89d4b
1 changed files with 4 additions and 5 deletions
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9
drivers/net/ethernet/realtek/r8169.c
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@ -754,7 +754,6 @@ struct rtl8169_tc_offsets {
bool inited;
__le64 tx_errors;
__le32 tx_multi_collision;
__le32 rx_multicast;
__le16 tx_aborted;
};
@ -2326,7 +2325,6 @@ static bool rtl8169_init_counter_offsets(struct net_device *dev)
tp->tc_offset.tx_errors = tp->counters.tx_errors;
tp->tc_offset.tx_multi_collision = tp->counters.tx_multi_collision;
tp->tc_offset.rx_multicast = tp->counters.rx_multicast;
tp->tc_offset.tx_aborted = tp->counters.tx_aborted;
tp->tc_offset.inited = true;
@ -7480,6 +7478,9 @@ process_pkt:
tp->rx_stats.packets++;
tp->rx_stats.bytes += pkt_size;
u64_stats_update_end(&tp->rx_stats.syncp);
if (skb->pkt_type == PACKET_MULTICAST)
dev->stats.multicast++;
}
release_descriptor:
desc->opts2 = 0;
@ -7790,7 +7791,6 @@ rtl8169_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
stats->rx_bytes = tp->rx_stats.bytes;
} while (u64_stats_fetch_retry_irq(&tp->rx_stats.syncp, start));
do {
start = u64_stats_fetch_begin_irq(&tp->tx_stats.syncp);
stats->tx_packets = tp->tx_stats.packets;
@ -7804,6 +7804,7 @@ rtl8169_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
stats->rx_crc_errors = dev->stats.rx_crc_errors;
stats->rx_fifo_errors = dev->stats.rx_fifo_errors;
stats->rx_missed_errors = dev->stats.rx_missed_errors;
stats->multicast = dev->stats.multicast;
/*
* Fetch additonal counter values missing in stats collected by driver
@ -7819,8 +7820,6 @@ rtl8169_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
le64_to_cpu(tp->tc_offset.tx_errors);
stats->collisions = le32_to_cpu(tp->counters.tx_multi_collision) -
le32_to_cpu(tp->tc_offset.tx_multi_collision);
stats->multicast = le32_to_cpu(tp->counters.rx_multicast) -
le32_to_cpu(tp->tc_offset.rx_multicast);
stats->tx_aborted_errors = le16_to_cpu(tp->counters.tx_aborted) -
le16_to_cpu(tp->tc_offset.tx_aborted);