slip: Use net_device_stats from struct net_device

Use net_device->stats for stats instead of private variable copies in
struct slip. Use ndo_get_stat64 so the additions can be performed on a private
destination buffer.

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 31 insertions, 30 deletions

diff --git a/drivers/net/slip.c b/drivers/net/slip.c
index d5a36f5417c..38547a8938f 100644
--- a/drivers/net/slip.c
+++ b/drivers/net/slip.c
@@ -271,7 +271,7 @@ static int sl_realloc_bufs(struct slip *sl, int mtu)
                         memcpy(sl->xbuff, sl->xhead, sl->xleft);
                 } else  {
                         sl->xleft = 0;
-                        sl->tx_dropped++;
+                        dev->stats.tx_dropped++;
                 }
         }
         sl->xhead = sl->xbuff;
@@ -281,7 +281,7 @@ static int sl_realloc_bufs(struct slip *sl, int mtu)
                         memcpy(sl->rbuff, rbuff, sl->rcount);
                 } else  {
                         sl->rcount = 0;
-                        sl->rx_over_errors++;
+                        dev->stats.rx_over_errors++;
                         set_bit(SLF_ERROR, &sl->flags);
                 }
         }
@@ -319,6 +319,7 @@ static inline void sl_unlock(struct slip *sl)
 /* Send one completely decapsulated IP datagram to the IP layer. */
 static void sl_bump(struct slip *sl)
 {
+        struct net_device *dev = sl->dev;
         struct sk_buff *skb;
         int count;
 
@@ -329,13 +330,13 @@ static void sl_bump(struct slip *sl)
                 if (c & SL_TYPE_COMPRESSED_TCP) {
                         /* ignore compressed packets when CSLIP is off */
                         if (!(sl->mode & SL_MODE_CSLIP)) {
-                                printk(KERN_WARNING "%s: compressed packet ignored\n", sl->dev->name);
+                                printk(KERN_WARNING "%s: compressed packet ignored\n", dev->name);
                                 return;
                         }
                         /* make sure we've reserved enough space for uncompress
                            to use */
                         if (count + 80 > sl->buffsize) {
-                                sl->rx_over_errors++;
+                                dev->stats.rx_over_errors++;
                                 return;
                         }
                         count = slhc_uncompress(sl->slcomp, sl->rbuff, count);
@@ -346,7 +347,7 @@ static void sl_bump(struct slip *sl)
                                 /* turn on header compression */
                                 sl->mode |= SL_MODE_CSLIP;
                                 sl->mode &= ~SL_MODE_ADAPTIVE;
-                                printk(KERN_INFO "%s: header compression turned on\n", sl->dev->name);
+                                printk(KERN_INFO "%s: header compression turned on\n", dev->name);
                         }
                         sl->rbuff[0] &= 0x4f;
                         if (slhc_remember(sl->slcomp, sl->rbuff, count) <= 0)
@@ -355,20 +356,20 @@ static void sl_bump(struct slip *sl)
         }
 #endif  /* SL_INCLUDE_CSLIP */
 
-        sl->rx_bytes += count;
+        dev->stats.rx_bytes += count;
 
         skb = dev_alloc_skb(count);
         if (skb == NULL) {
-                printk(KERN_WARNING "%s: memory squeeze, dropping packet.\n", sl->dev->name);
-                sl->rx_dropped++;
+                printk(KERN_WARNING "%s: memory squeeze, dropping packet.\n", dev->name);
+                dev->stats.rx_dropped++;
                 return;
         }
-        skb->dev = sl->dev;
+        skb->dev = dev;
         memcpy(skb_put(skb, count), sl->rbuff, count);
         skb_reset_mac_header(skb);
         skb->protocol = htons(ETH_P_IP);
         netif_rx(skb);
-        sl->rx_packets++;
+        dev->stats.rx_packets++;
 }
 
 /* Encapsulate one IP datagram and stuff into a TTY queue. */
@@ -379,7 +380,7 @@ static void sl_encaps(struct slip *sl, unsigned char *icp, int len)
 
         if (len > sl->mtu) {            /* Sigh, shouldn't occur BUT ... */
                 printk(KERN_WARNING "%s: truncating oversized transmit packet!\n", sl->dev->name);
-                sl->tx_dropped++;
+                sl->dev->stats.tx_dropped++;
                 sl_unlock(sl);
                 return;
         }
@@ -433,7 +434,7 @@ static void slip_write_wakeup(struct tty_struct *tty)
         if (sl->xleft <= 0)  {
                 /* Now serial buffer is almost free & we can start
                  * transmission of another packet */
-                sl->tx_packets++;
+                sl->dev->stats.tx_packets++;
                 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
                 sl_unlock(sl);
                 return;
@@ -496,7 +497,7 @@ sl_xmit(struct sk_buff *skb, struct net_device *dev)
         }
 
         sl_lock(sl);
-        sl->tx_bytes += skb->len;
+        dev->stats.tx_bytes += skb->len;
         sl_encaps(sl, skb->data, skb->len);
         spin_unlock(&sl->lock);
 
@@ -558,16 +559,16 @@ static int sl_change_mtu(struct net_device *dev, int new_mtu)
 
 /* Netdevice get statistics request */
 
-static struct net_device_stats *
-sl_get_stats(struct net_device *dev)
+static struct rtnl_link_stats64 *
+sl_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 {
-        struct net_device_stats *stats = &dev->stats;
-        struct slip *sl = netdev_priv(dev);
+        struct net_device_stats *devstats = &dev->stats;
         unsigned long c_rx_dropped = 0;
 #ifdef SL_INCLUDE_CSLIP
         unsigned long c_rx_fifo_errors = 0;
         unsigned long c_tx_fifo_errors = 0;
         unsigned long c_collisions = 0;
+        struct slip *sl = netdev_priv(dev);
         struct slcompress *comp = sl->slcomp;
 
         if (comp) {
@@ -580,16 +581,16 @@ sl_get_stats(struct net_device *dev)
         stats->tx_fifo_errors = sl->tx_compressed + c_tx_fifo_errors;
         stats->collisions     = sl->tx_misses + c_collisions;
 #endif
+        stats->rx_packets     = devstats->rx_packets;
+        stats->tx_packets     = devstats->tx_packets;
+        stats->rx_bytes       = devstats->rx_bytes;
+        stats->tx_bytes       = devstats->tx_bytes;
+        stats->rx_dropped     = devstats->rx_dropped + c_rx_dropped;
+        stats->tx_dropped     = devstats->tx_dropped;
+        stats->tx_errors      = devstats->tx_errors;
+        stats->rx_errors      = devstats->rx_errors;
+        stats->rx_over_errors = devstats->rx_over_errors;
 
-        stats->rx_packets     = sl->rx_packets;
-        stats->tx_packets     = sl->tx_packets;
-        stats->rx_bytes       = sl->rx_bytes;
-        stats->tx_bytes       = sl->tx_bytes;
-        stats->rx_dropped     = sl->rx_dropped + c_rx_dropped;
-        stats->tx_dropped     = sl->tx_dropped;
-        stats->tx_errors      = sl->tx_errors;
-        stats->rx_errors      = sl->rx_errors;
-        stats->rx_over_errors = sl->rx_over_errors;
         return stats;
 }
 
@@ -633,7 +634,7 @@ static const struct net_device_ops sl_netdev_ops = {
         .ndo_open               = sl_open,
         .ndo_stop               = sl_close,
         .ndo_start_xmit         = sl_xmit,
-        .ndo_get_stats          = sl_get_stats,
+        .ndo_get_stats64        = sl_get_stats64,
         .ndo_change_mtu         = sl_change_mtu,
         .ndo_tx_timeout         = sl_tx_timeout,
 #ifdef CONFIG_SLIP_SMART
@@ -681,7 +682,7 @@ static void slip_receive_buf(struct tty_struct *tty, const unsigned char *cp,
         while (count--) {
                 if (fp && *fp++) {
                         if (!test_and_set_bit(SLF_ERROR, &sl->flags))
-                                sl->rx_errors++;
+                                sl->dev->stats.rx_errors++;
                         cp++;
                         continue;
                 }
@@ -981,7 +982,7 @@ static void slip_unesc(struct slip *sl, unsigned char s)
                         sl->rbuff[sl->rcount++] = s;
                         return;
                 }
-                sl->rx_over_errors++;
+                sl->dev->stats.rx_over_errors++;
                 set_bit(SLF_ERROR, &sl->flags);
         }
 }
@@ -1057,7 +1058,7 @@ static void slip_unesc6(struct slip *sl, unsigned char s)
                                         sl->rbuff[sl->rcount++] = c;
                                         return;
                                 }
-                                sl->rx_over_errors++;
+                                sl->dev->stats.rx_over_errors++;
                                 set_bit(SLF_ERROR, &sl->flags);
                         }
                 }