r8169: fix unsigned int wraparound with TSO

The r8169 may get stuck or show bad behaviour after activating TSO :
the net_device is not stopped when it has no more TX descriptors.
This problem comes from TX_BUFS_AVAIL which may reach -1 when all
transmit descriptors are in use. The patch simply tries to keep positive
values.

Tested with 8111d(onboard) on a D510MO, and with 8111e(onboard) on a
Zotac 890GXITX.

Signed-off-by: Julien Ducourthial <jducourt@free.fr>
Acked-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 6 deletions

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index f54509377efa..ce6b44d1f252 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -61,8 +61,12 @@
 #define R8169_MSG_DEFAULT \
         (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_IFUP | NETIF_MSG_IFDOWN)
 
-#define TX_BUFFS_AVAIL(tp) \
-        (tp->dirty_tx + NUM_TX_DESC - tp->cur_tx - 1)
+#define TX_SLOTS_AVAIL(tp) \
+        (tp->dirty_tx + NUM_TX_DESC - tp->cur_tx)
+
+/* A skbuff with nr_frags needs nr_frags+1 entries in the tx queue */
+#define TX_FRAGS_READY_FOR(tp,nr_frags) \
+        (TX_SLOTS_AVAIL(tp) >= (nr_frags + 1))
 
 /* Maximum number of multicast addresses to filter (vs. Rx-all-multicast).
    The RTL chips use a 64 element hash table based on the Ethernet CRC. */
@@ -5115,7 +5119,7 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
         u32 opts[2];
         int frags;
 
-        if (unlikely(TX_BUFFS_AVAIL(tp) < skb_shinfo(skb)->nr_frags)) {
+        if (unlikely(!TX_FRAGS_READY_FOR(tp, skb_shinfo(skb)->nr_frags))) {
                 netif_err(tp, drv, dev, "BUG! Tx Ring full when queue awake!\n");
                 goto err_stop_0;
         }
@@ -5169,7 +5173,7 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
 
         mmiowb();
 
-        if (TX_BUFFS_AVAIL(tp) < MAX_SKB_FRAGS) {
+        if (!TX_FRAGS_READY_FOR(tp, MAX_SKB_FRAGS)) {
                 /* Avoid wrongly optimistic queue wake-up: rtl_tx thread must
                  * not miss a ring update when it notices a stopped queue.
                  */
@@ -5183,7 +5187,7 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
                  * can't.
                  */
                 smp_mb();
-                if (TX_BUFFS_AVAIL(tp) >= MAX_SKB_FRAGS)
+                if (TX_FRAGS_READY_FOR(tp, MAX_SKB_FRAGS))
                         netif_wake_queue(dev);
         }
 
@@ -5306,7 +5310,7 @@ static void rtl_tx(struct net_device *dev, struct rtl8169_private *tp)
                  */
                 smp_mb();
                 if (netif_queue_stopped(dev) &&
-                    (TX_BUFFS_AVAIL(tp) >= MAX_SKB_FRAGS)) {
+                    TX_FRAGS_READY_FOR(tp, MAX_SKB_FRAGS)) {
                         netif_wake_queue(dev);
                 }
                 /*