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)

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Rasesh Mody <rmody@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 33 insertions, 41 deletions

diff --git a/drivers/net/bna/bnad.c b/drivers/net/bna/bnad.c
index cbc1d563a0c2..79c4c2441449 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 3261401e35cb..ee377888b905 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 b337bd9bed29..11fa2ea842c1 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;