lan78xx: fix statistics counter error

Fix rx_bytes, tx_bytes and tx_frames error in netdev.stats.
- rx_bytes counted bytes excluding size of struct ethhdr.
- tx_packets didn't count multiple packets in a single urb
- tx_bytes included 8 bytes of extra commands.

Signed-off-by: Woojung Huh <woojung.huh@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 5 deletions

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index f20890ee03f3..0460b81a8784 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -269,6 +269,7 @@ struct skb_data {		/* skb->cb is one of these */
         struct lan78xx_net *dev;
         enum skb_state state;
         size_t length;
+        int num_of_packet;
 };
 
 struct usb_context {
@@ -2464,7 +2465,7 @@ static void tx_complete(struct urb *urb)
         struct lan78xx_net *dev = entry->dev;
 
         if (urb->status == 0) {
-                dev->net->stats.tx_packets++;
+                dev->net->stats.tx_packets += entry->num_of_packet;
                 dev->net->stats.tx_bytes += entry->length;
         } else {
                 dev->net->stats.tx_errors++;
@@ -2681,10 +2682,11 @@ void lan78xx_skb_return(struct lan78xx_net *dev, struct sk_buff *skb)
                 return;
         }
 
-        skb->protocol = eth_type_trans(skb, dev->net);
         dev->net->stats.rx_packets++;
         dev->net->stats.rx_bytes += skb->len;
 
+        skb->protocol = eth_type_trans(skb, dev->net);
+
         netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
                   skb->len + sizeof(struct ethhdr), skb->protocol);
         memset(skb->cb, 0, sizeof(struct skb_data));
@@ -2934,13 +2936,16 @@ static void lan78xx_tx_bh(struct lan78xx_net *dev)
 
         skb_totallen = 0;
         pkt_cnt = 0;
+        count = 0;
+        length = 0;
         for (skb = tqp->next; pkt_cnt < tqp->qlen; skb = skb->next) {
                 if (skb_is_gso(skb)) {
                         if (pkt_cnt) {
                                 /* handle previous packets first */
                                 break;
                         }
-                        length = skb->len;
+                        count = 1;
+                        length = skb->len - TX_OVERHEAD;
                         skb2 = skb_dequeue(tqp);
                         goto gso_skb;
                 }
@@ -2961,14 +2966,13 @@ static void lan78xx_tx_bh(struct lan78xx_net *dev)
         for (count = pos = 0; count < pkt_cnt; count++) {
                 skb2 = skb_dequeue(tqp);
                 if (skb2) {
+                        length += (skb2->len - TX_OVERHEAD);
                         memcpy(skb->data + pos, skb2->data, skb2->len);
                         pos += roundup(skb2->len, sizeof(u32));
                         dev_kfree_skb(skb2);
                 }
         }
 
-        length = skb_totallen;
-
 gso_skb:
         urb = usb_alloc_urb(0, GFP_ATOMIC);
         if (!urb) {
@@ -2980,6 +2984,7 @@ gso_skb:
         entry->urb = urb;
         entry->dev = dev;
         entry->length = length;
+        entry->num_of_packet = count;
 
         spin_lock_irqsave(&dev->txq.lock, flags);
         ret = usb_autopm_get_interface_async(dev->intf);