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Date: Mon, 30 Nov 2009 10:09:24 -0800
From: "Michael Chan" <mchan@...adcom.com>
To: "Breno Leitao" <leitao@...ux.vnet.ibm.com>
cc: "Eric Dumazet" <eric.dumazet@...il.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] bnx2: avoid flushing statistics when doing a MTU
change
On Mon, 2009-11-30 at 06:05 -0800, Breno Leitao wrote:
> Eric Dumazet wrote:
> > I see nothing in the driver/patch that will consolidate bp->dev->stats
> > before your memcpy(). DMA transfert doesnt touch bp->dev->stats.
> You're right, calling bnx2_get_stats() after the DMA should be enough,
> as the following patch
> ---
>
> [PATCH] bnx2: avoid flushing statistics when doing a MTU change
>
> Actually when bnx2 changes the interface's MTU size, it resets
> the chip and consequently flushes the interface statistics.
> This patch saves the statistics in a temporary space in order to
> maintain the statistics correct after the chip reset.
Thanks Breno. As I mentioned earlier, this does not save the ethtool -S
stats before reset. The user may be confused when netstat does not
match ethtool -S. I think we should save the statistics block so
everything will match up. If you don't beat me to it, I'll work on the
patch later today.
>
> Signed-off-by: Breno Leitao<leitao@...ux.vnet.ibm.com>
> ---
> drivers/net/bnx2.c | 57 ++++++++++++++++++++++++++++++++++++++-------------
> drivers/net/bnx2.h | 1 +
> 2 files changed, 43 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
> index 7fa4048..07c0376 100644
> --- a/drivers/net/bnx2.c
> +++ b/drivers/net/bnx2.c
> @@ -6221,6 +6221,8 @@ bnx2_open(struct net_device *dev)
> else if (bp->flags & BNX2_FLAG_USING_MSIX)
> printk(KERN_INFO PFX "%s: using MSIX\n", dev->name);
>
> + memset(&bp->stats_extra, 0, sizeof(struct net_device_stats));
> +
> netif_tx_start_all_queues(dev);
>
> return 0;
> @@ -6469,46 +6471,58 @@ bnx2_get_stats(struct net_device *dev)
> net_stats->rx_packets =
> GET_NET_STATS(stats_blk->stat_IfHCInUcastPkts) +
> GET_NET_STATS(stats_blk->stat_IfHCInMulticastPkts) +
> - GET_NET_STATS(stats_blk->stat_IfHCInBroadcastPkts);
> + GET_NET_STATS(stats_blk->stat_IfHCInBroadcastPkts) +
> + bp->stats_extra.rx_packets;
>
> net_stats->tx_packets =
> GET_NET_STATS(stats_blk->stat_IfHCOutUcastPkts) +
> GET_NET_STATS(stats_blk->stat_IfHCOutMulticastPkts) +
> - GET_NET_STATS(stats_blk->stat_IfHCOutBroadcastPkts);
> + GET_NET_STATS(stats_blk->stat_IfHCOutBroadcastPkts) +
> + bp->stats_extra.tx_packets;
>
> net_stats->rx_bytes =
> - GET_NET_STATS(stats_blk->stat_IfHCInOctets);
> + GET_NET_STATS(stats_blk->stat_IfHCInOctets) +
> + bp->stats_extra.rx_bytes;
>
> net_stats->tx_bytes =
> - GET_NET_STATS(stats_blk->stat_IfHCOutOctets);
> + GET_NET_STATS(stats_blk->stat_IfHCOutOctets) +
> + bp->stats_extra.tx_bytes;
>
> net_stats->multicast =
> - GET_NET_STATS(stats_blk->stat_IfHCOutMulticastPkts);
> + GET_NET_STATS(stats_blk->stat_IfHCOutMulticastPkts) +
> + bp->stats_extra.multicast;
>
> net_stats->collisions =
> - (unsigned long) stats_blk->stat_EtherStatsCollisions;
> + (unsigned long) stats_blk->stat_EtherStatsCollisions +
> + bp->stats_extra.collisions;
>
> net_stats->rx_length_errors =
> (unsigned long) (stats_blk->stat_EtherStatsUndersizePkts +
> - stats_blk->stat_EtherStatsOverrsizePkts);
> + stats_blk->stat_EtherStatsOverrsizePkts) +
> + bp->stats_extra.rx_length_errors;
>
> net_stats->rx_over_errors =
> (unsigned long) (stats_blk->stat_IfInFTQDiscards +
> - stats_blk->stat_IfInMBUFDiscards);
> + stats_blk->stat_IfInMBUFDiscards) +
> + bp->stats_extra.rx_over_errors;
>
> net_stats->rx_frame_errors =
> - (unsigned long) stats_blk->stat_Dot3StatsAlignmentErrors;
> + (unsigned long) stats_blk->stat_Dot3StatsAlignmentErrors +
> + bp->stats_extra.rx_frame_errors;
>
> net_stats->rx_crc_errors =
> - (unsigned long) stats_blk->stat_Dot3StatsFCSErrors;
> + (unsigned long) stats_blk->stat_Dot3StatsFCSErrors +
> + bp->stats_extra.rx_crc_errors;
>
> net_stats->rx_errors = net_stats->rx_length_errors +
> net_stats->rx_over_errors + net_stats->rx_frame_errors +
> - net_stats->rx_crc_errors;
> + net_stats->rx_crc_errors +
> + bp->stats_extra.rx_errors;
>
> net_stats->tx_aborted_errors =
> (unsigned long) (stats_blk->stat_Dot3StatsExcessiveCollisions +
> - stats_blk->stat_Dot3StatsLateCollisions);
> + stats_blk->stat_Dot3StatsLateCollisions) +
> + bp->stats_extra.tx_aborted_errors;
>
> if ((CHIP_NUM(bp) == CHIP_NUM_5706) ||
> (CHIP_ID(bp) == CHIP_ID_5708_A0))
> @@ -6516,7 +6530,8 @@ bnx2_get_stats(struct net_device *dev)
> else {
> net_stats->tx_carrier_errors =
> (unsigned long)
> - stats_blk->stat_Dot3StatsCarrierSenseErrors;
> + stats_blk->stat_Dot3StatsCarrierSenseErrors +
> + bp->stats_extra.tx_carrier_errors;
> }
>
> net_stats->tx_errors =
> @@ -6524,11 +6539,13 @@ bnx2_get_stats(struct net_device *dev)
> stats_blk->stat_emac_tx_stat_dot3statsinternalmactransmiterrors
> +
> net_stats->tx_aborted_errors +
> - net_stats->tx_carrier_errors;
> + net_stats->tx_carrier_errors +
> + bp->stats_extra.tx_errors;
>
> net_stats->rx_missed_errors =
> (unsigned long) (stats_blk->stat_IfInFTQDiscards +
> - stats_blk->stat_IfInMBUFDiscards + stats_blk->stat_FwRxDrop);
> + stats_blk->stat_IfInMBUFDiscards + stats_blk->stat_FwRxDrop) +
> + bp->stats_extra.rx_missed_errors;
>
> return net_stats;
> }
> @@ -6989,6 +7006,16 @@ bnx2_change_ring_size(struct bnx2 *bp, u32 rx, u32 tx)
> {
> if (netif_running(bp->dev)) {
> bnx2_netif_stop(bp);
> +
> + /* Save statistics that is going to be reseted */
> + REG_WR(bp, BNX2_HC_COMMAND, bp->hc_cmd |
> + BNX2_HC_COMMAND_STATS_NOW);
> + REG_RD(bp, BNX2_HC_COMMAND);
> + udelay(5);
> + bnx2_get_stats(bp->dev);
> + memcpy(&bp->stats_extra, &bp->dev->stats,
> + sizeof(struct net_device_stats));
> +
> bnx2_reset_chip(bp, BNX2_DRV_MSG_CODE_RESET);
> bnx2_free_skbs(bp);
> bnx2_free_mem(bp);
> diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
> index a4d8340..1063d1a 100644
> --- a/drivers/net/bnx2.h
> +++ b/drivers/net/bnx2.h
> @@ -6912,6 +6912,7 @@ struct bnx2 {
>
> const struct firmware *mips_firmware;
> const struct firmware *rv2p_firmware;
> + struct net_device_stats stats_extra;
> };
>
> #define REG_RD(bp, offset) \
--
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