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Date: Mon, 30 Aug 2010 10:38:01 -0700
From: Rasesh Mody <rmody@...cade.com>
To: Eric Dumazet <eric.dumazet@...il.com>,
David Miller <davem@...emloft.net>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Akshay Mathur <amathur@...cade.com>,
Debashis Dutt <ddutt@...cade.COM>,
Jing Huang <huangj@...cade.COM>
Subject: RE: [PATCH net-next-2.6] bna: fix stats handling
On 8/23/2010 10:31 PM, Eric Dumazet wrote:
> Brocade guys, could you please test the following patch on your
> hardware ?
>
> Thanks
>
> [PATCH net-next-2.6] bna: fix stats handling
>
> get_stats() method incorrectly clears a global array before folding
> various stats. This can break SNMP applications.
>
> Switch to 64 bit flavor to work on a user supplied buffer, and provide
> 64bit counters even on 32bit arches.
>
> Fix a bug in bnad_netdev_hwstats_fill(), for rx_fifo_errors, missing a
> folding (only the last counter was taken into account)
>
Thanks Eric!
We tested the patch with our hardware and the patch works fine.
The patch applies cleanly to the net-next-2.6.
> Signed-off-by: Eric Dumazet<eric.dumazet@...il.com>
Acked-by: Rasesh Mody <rmody@...cade.com>
> ---
> drivers/net/bna/bnad.c | 52 ++++++++++++++-----------------
> drivers/net/bna/bnad.h | 5 +-
> drivers/net/bna/bnad_ethtool.c | 17 ++++------
> 3 files changed, 33 insertions(+), 41 deletions(-)
>
> diff --git a/drivers/net/bna/bnad.c b/drivers/net/bna/bnad.c
> index 491d148..a935b96 100644
> --- a/drivers/net/bna/bnad.c
> +++ b/drivers/net/bna/bnad.c
> @@ -1964,25 +1964,24 @@ bnad_enable_default_bcast(struct bnad *bnad)
>
> /* Statistics utilities */
> void
> -bnad_netdev_qstats_fill(struct bnad *bnad)
> +bnad_netdev_qstats_fill(struct bnad *bnad, struct rtnl_link_stats64 *stats)
> {
> - struct net_device_stats *net_stats =&bnad->net_stats;
> int i, j;
>
> for (i = 0; i< bnad->num_rx; i++) {
> for (j = 0; j< bnad->num_rxp_per_rx; j++) {
> if (bnad->rx_info[i].rx_ctrl[j].ccb) {
> - net_stats->rx_packets += bnad->rx_info[i].
> + stats->rx_packets += bnad->rx_info[i].
> rx_ctrl[j].ccb->rcb[0]->rxq->rx_packets;
> - net_stats->rx_bytes += bnad->rx_info[i].
> + stats->rx_bytes += bnad->rx_info[i].
> rx_ctrl[j].ccb->rcb[0]->rxq->rx_bytes;
> if (bnad->rx_info[i].rx_ctrl[j].ccb->rcb[1]&&
> bnad->rx_info[i].rx_ctrl[j].ccb->
> rcb[1]->rxq) {
> - net_stats->rx_packets +=
> + stats->rx_packets +=
> bnad->rx_info[i].rx_ctrl[j].
> ccb->rcb[1]->rxq->rx_packets;
> - net_stats->rx_bytes +=
> + stats->rx_bytes +=
> bnad->rx_info[i].rx_ctrl[j].
> ccb->rcb[1]->rxq->rx_bytes;
> }
> @@ -1992,9 +1991,9 @@ bnad_netdev_qstats_fill(struct bnad *bnad)
> for (i = 0; i< bnad->num_tx; i++) {
> for (j = 0; j< bnad->num_txq_per_tx; j++) {
> if (bnad->tx_info[i].tcb[j]) {
> - net_stats->tx_packets +=
> + stats->tx_packets +=
> bnad->tx_info[i].tcb[j]->txq->tx_packets;
> - net_stats->tx_bytes +=
> + stats->tx_bytes +=
> bnad->tx_info[i].tcb[j]->txq->tx_bytes;
> }
> }
> @@ -2005,37 +2004,36 @@ bnad_netdev_qstats_fill(struct bnad *bnad)
> * Must be called with the bna_lock held.
> */
> void
> -bnad_netdev_hwstats_fill(struct bnad *bnad)
> +bnad_netdev_hwstats_fill(struct bnad *bnad, struct rtnl_link_stats64 *stats)
> {
> struct bfi_ll_stats_mac *mac_stats;
> - struct net_device_stats *net_stats =&bnad->net_stats;
> u64 bmap;
> int i;
>
> mac_stats =&bnad->stats.bna_stats->hw_stats->mac_stats;
> - net_stats->rx_errors =
> + stats->rx_errors =
> mac_stats->rx_fcs_error + mac_stats->rx_alignment_error +
> mac_stats->rx_frame_length_error + mac_stats->rx_code_error +
> mac_stats->rx_undersize;
> - net_stats->tx_errors = mac_stats->tx_fcs_error +
> + stats->tx_errors = mac_stats->tx_fcs_error +
> mac_stats->tx_undersize;
> - net_stats->rx_dropped = mac_stats->rx_drop;
> - net_stats->tx_dropped = mac_stats->tx_drop;
> - net_stats->multicast = mac_stats->rx_multicast;
> - net_stats->collisions = mac_stats->tx_total_collision;
> + stats->rx_dropped = mac_stats->rx_drop;
> + stats->tx_dropped = mac_stats->tx_drop;
> + stats->multicast = mac_stats->rx_multicast;
> + stats->collisions = mac_stats->tx_total_collision;
>
> - net_stats->rx_length_errors = mac_stats->rx_frame_length_error;
> + stats->rx_length_errors = mac_stats->rx_frame_length_error;
>
> /* receive ring buffer overflow ?? */
>
> - net_stats->rx_crc_errors = mac_stats->rx_fcs_error;
> - net_stats->rx_frame_errors = mac_stats->rx_alignment_error;
> + stats->rx_crc_errors = mac_stats->rx_fcs_error;
> + stats->rx_frame_errors = mac_stats->rx_alignment_error;
> /* recv'r fifo overrun */
> bmap = (u64)bnad->stats.bna_stats->rxf_bmap[0] |
> ((u64)bnad->stats.bna_stats->rxf_bmap[1]<< 32);
> for (i = 0; bmap&& (i< BFI_LL_RXF_ID_MAX); i++) {
> if (bmap& 1) {
> - net_stats->rx_fifo_errors =
> + stats->rx_fifo_errors +=
> bnad->stats.bna_stats->
> hw_stats->rxf_stats[i].frame_drops;
> break;
> @@ -2638,22 +2636,20 @@ bnad_start_xmit(struct sk_buff *skb, struct net_device *netdev)
> * Used spin_lock to synchronize reading of stats structures, which
> * is written by BNA under the same lock.
> */
> -static struct net_device_stats *
> -bnad_get_netdev_stats(struct net_device *netdev)
> +static struct rtnl_link_stats64 *
> +bnad_get_stats64(struct net_device *netdev, struct rtnl_link_stats64 *stats)
> {
> struct bnad *bnad = netdev_priv(netdev);
> unsigned long flags;
>
> spin_lock_irqsave(&bnad->bna_lock, flags);
>
> - memset(&bnad->net_stats, 0, sizeof(struct net_device_stats));
> -
> - bnad_netdev_qstats_fill(bnad);
> - bnad_netdev_hwstats_fill(bnad);
> + bnad_netdev_qstats_fill(bnad, stats);
> + bnad_netdev_hwstats_fill(bnad, stats);
>
> spin_unlock_irqrestore(&bnad->bna_lock, flags);
>
> - return&bnad->net_stats;
> + return stats;
> }
>
> static void
> @@ -2858,7 +2854,7 @@ static const struct net_device_ops bnad_netdev_ops = {
> .ndo_open = bnad_open,
> .ndo_stop = bnad_stop,
> .ndo_start_xmit = bnad_start_xmit,
> - .ndo_get_stats = bnad_get_netdev_stats,
> + .ndo_get_stats64 = bnad_get_stats64,
> .ndo_set_rx_mode = bnad_set_rx_mode,
> .ndo_set_multicast_list = bnad_set_rx_mode,
> .ndo_validate_addr = eth_validate_addr,
> diff --git a/drivers/net/bna/bnad.h b/drivers/net/bna/bnad.h
> index 3261401..ee37788 100644
> --- a/drivers/net/bna/bnad.h
> +++ b/drivers/net/bna/bnad.h
> @@ -273,7 +273,6 @@ struct bnad {
>
> /* Statistics */
> struct bnad_stats stats;
> - struct net_device_stats net_stats;
>
> struct bnad_diag *diag;
>
> @@ -308,8 +307,8 @@ extern void bnad_cleanup_rx(struct bnad *bnad, uint rx_id);
> extern void bnad_dim_timer_start(struct bnad *bnad);
>
> /* Statistics */
> -extern void bnad_netdev_qstats_fill(struct bnad *bnad);
> -extern void bnad_netdev_hwstats_fill(struct bnad *bnad);
> +extern void bnad_netdev_qstats_fill(struct bnad *bnad, struct rtnl_link_stats64 *stats);
> +extern void bnad_netdev_hwstats_fill(struct bnad *bnad, struct rtnl_link_stats64 *stats);
>
> /**
> * MACROS
> diff --git a/drivers/net/bna/bnad_ethtool.c b/drivers/net/bna/bnad_ethtool.c
> index 7e630f5..1f0c124 100644
> --- a/drivers/net/bna/bnad_ethtool.c
> +++ b/drivers/net/bna/bnad_ethtool.c
> @@ -34,7 +34,7 @@
> #define BNAD_NUM_TXQ_COUNTERS 5
>
> #define BNAD_ETHTOOL_STATS_NUM \
> - (sizeof(struct net_device_stats) / sizeof(unsigned long) + \
> + (sizeof(struct rtnl_link_stats64) / sizeof(u64) + \
> sizeof(struct bnad_drv_stats) / sizeof(u64) + \
> offsetof(struct bfi_ll_stats, rxf_stats[0]) / sizeof(u64))
>
> @@ -1159,7 +1159,8 @@ bnad_get_ethtool_stats(struct net_device *netdev, struct ethtool_stats *stats,
> {
> struct bnad *bnad = netdev_priv(netdev);
> int i, j, bi;
> - unsigned long *net_stats, flags;
> + unsigned long flags;
> + struct rtnl_link_stats64 *net_stats64;
> u64 *stats64;
> u64 bmap;
>
> @@ -1176,16 +1177,12 @@ bnad_get_ethtool_stats(struct net_device *netdev, struct ethtool_stats *stats,
> spin_lock_irqsave(&bnad->bna_lock, flags);
> bi = 0;
> memset(buf, 0, stats->n_stats * sizeof(u64));
> - memset(&bnad->net_stats, 0, sizeof(struct net_device_stats));
>
> - bnad_netdev_qstats_fill(bnad);
> - bnad_netdev_hwstats_fill(bnad);
> + net_stats64 = (struct rtnl_link_stats64 *)buf;
> + bnad_netdev_qstats_fill(bnad, net_stats64);
> + bnad_netdev_hwstats_fill(bnad, net_stats64);
>
> - /* Fill net_stats into ethtool buffers */
> - net_stats = (unsigned long *)&bnad->net_stats;
> - for (i = 0; i< sizeof(struct net_device_stats) / sizeof(unsigned long);
> - i++)
> - buf[bi++] = net_stats[i];
> + bi = sizeof(*net_stats64) / sizeof(u64);
>
> /* Fill driver stats into ethtool buffers */
> stats64 = (u64 *)&bnad->stats.drv_stats;
>
>
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