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>
This commit is contained in:
Родитель
c5baa80ac8
Коммит
477206a018
|
@ -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);
|
||||
}
|
||||
/*
|
||||
|
|
Загрузка…
Ссылка в новой задаче