It is duplicated. Also, the first instance in tg3_start_xmit() is racy.
Consider:
tg3_start_xmit()
if budget <= ...
tg3_tx()
(free up the entire ring)
tx_cons =
smp_mb
if queue_stopped and tx_avail, NO
if !queue_stopped
stop queue
return NETDEV_TX_BUSY
... tx queue stopped forever
Signed-off-by: Benjamin Poirier <bpoir...@suse.de>
---
Changes v2->v3
* new patch to avoid repeatedly open coding this block in the next patch.
---
drivers/net/ethernet/broadcom/tg3.c | 69 ++++++++++++++++++-------------------
1 file changed, 34 insertions(+), 35 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/tg3.c
b/drivers/net/ethernet/broadcom/tg3.c
index 0cecd6d..5d39554 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -7831,6 +7831,29 @@ static int tigon3_dma_hwbug_workaround(struct tg3_napi
*tnapi,
static netdev_tx_t tg3_start_xmit(struct sk_buff *, struct net_device *);
+static inline bool tg3_maybe_stop_txq(struct tg3_napi *tnapi,
+ struct netdev_queue *txq,
+ u32 stop_thresh, u32 wakeup_thresh)
+{
+ bool stopped = false;
+
+ if (unlikely(tg3_tx_avail(tnapi) <= stop_thresh)) {
+ if (!netif_tx_queue_stopped(txq)) {
+ stopped = true;
+ netif_tx_stop_queue(txq);
+ BUG_ON(wakeup_thresh >= tnapi->tx_pending);
+ }
+ /* netif_tx_stop_queue() must be done before checking tx index
+ * in tg3_tx_avail(), because in tg3_tx(), we update tx index
+ * before checking for netif_tx_queue_stopped().
+ */
+ smp_mb();
+ if (tg3_tx_avail(tnapi) > wakeup_thresh)
+ netif_tx_wake_queue(txq);
+ }
+ return stopped;
+}
+
/* Use GSO to workaround all TSO packets that meet HW bug conditions
* indicated in tg3_tx_frag_set()
*/
@@ -7841,20 +7864,9 @@ static int tg3_tso_bug(struct tg3 *tp, struct tg3_napi
*tnapi,
u32 frag_cnt_est = skb_shinfo(skb)->gso_segs * 3;
/* Estimate the number of fragments in the worst case */
- if (unlikely(tg3_tx_avail(tnapi) <= frag_cnt_est)) {
- netif_tx_stop_queue(txq);
-
- /* netif_tx_stop_queue() must be done before checking
- * checking tx index in tg3_tx_avail() below, because in
- * tg3_tx(), we update tx index before checking for
- * netif_tx_queue_stopped().
- */
- smp_mb();
- if (tg3_tx_avail(tnapi) <= frag_cnt_est)
- return NETDEV_TX_BUSY;
-
- netif_tx_wake_queue(txq);
- }
+ tg3_maybe_stop_txq(tnapi, txq, frag_cnt_est, frag_cnt_est);
+ if (netif_tx_queue_stopped(txq))
+ return NETDEV_TX_BUSY;
segs = skb_gso_segment(skb, tp->dev->features &
~(NETIF_F_TSO | NETIF_F_TSO6));
@@ -7902,16 +7914,13 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb,
struct net_device *dev)
* interrupt. Furthermore, IRQ processing runs lockless so we have
* no IRQ context deadlocks to worry about either. Rejoice!
*/
- if (unlikely(budget <= (skb_shinfo(skb)->nr_frags + 1))) {
- if (!netif_tx_queue_stopped(txq)) {
- netif_tx_stop_queue(txq);
-
- /* This is a hard error, log it. */
- netdev_err(dev,
- "BUG! Tx Ring full when queue awake!\n");
- }
- return NETDEV_TX_BUSY;
+ if (tg3_maybe_stop_txq(tnapi, txq, skb_shinfo(skb)->nr_frags + 1,
+ TG3_TX_WAKEUP_THRESH(tnapi))) {
+ /* This is a hard error, log it. */
+ netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
}
+ if (netif_tx_queue_stopped(txq))
+ return NETDEV_TX_BUSY;
entry = tnapi->tx_prod;
base_flags = 0;
@@ -8087,18 +8096,8 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb,
struct net_device *dev)
tw32_tx_mbox(tnapi->prodmbox, entry);
tnapi->tx_prod = entry;
- if (unlikely(tg3_tx_avail(tnapi) <= (MAX_SKB_FRAGS + 1))) {
- netif_tx_stop_queue(txq);
-
- /* netif_tx_stop_queue() must be done before checking
- * checking tx index in tg3_tx_avail() below, because in
- * tg3_tx(), we update tx index before checking for
- * netif_tx_queue_stopped().
- */
- smp_mb();
- if (tg3_tx_avail(tnapi) > TG3_TX_WAKEUP_THRESH(tnapi))
- netif_tx_wake_queue(txq);
- }
+ tg3_maybe_stop_txq(tnapi, txq, MAX_SKB_FRAGS + 1,
+ TG3_TX_WAKEUP_THRESH(tnapi));
mmiowb();
return NETDEV_TX_OK;
--
1.8.4.5
--
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