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cxgb3 - Fix I/O synchronization

Browse source 
Synchronize memory access before ringing
the Tx door bell.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Divy Le Ray 2007-11-16 11:22:21 -08:00 committed by David S. Miller
parent a2604be548
commit afefce66a5
1 changed files with 5 additions and 2 deletions
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7
drivers/net/cxgb3/sge.c
View file

@ -174,6 +174,7 @@ static inline struct sge_qset *txq_to_qset(const struct sge_txq *q, int qidx)
static inline void refill_rspq(struct adapter *adapter, static inline void refill_rspq(struct adapter *adapter,
const struct sge_rspq *q, unsigned int credits) const struct sge_rspq *q, unsigned int credits)
{ {
rmb();
t3_write_reg(adapter, A_SG_RSPQ_CREDIT_RETURN, t3_write_reg(adapter, A_SG_RSPQ_CREDIT_RETURN,
V_RSPQ(q->cntxt_id) | V_CREDITS(credits)); V_RSPQ(q->cntxt_id) | V_CREDITS(credits));
} }
@ -458,7 +459,7 @@ nomem: q->alloc_failed++;
} }
q->credits++; q->credits++;
} }
wmb();
t3_write_reg(adap, A_SG_KDOORBELL, V_EGRCNTX(q->cntxt_id)); t3_write_reg(adap, A_SG_KDOORBELL, V_EGRCNTX(q->cntxt_id));
} }
@ -1353,6 +1354,7 @@ static void restart_ctrlq(unsigned long data)
} }
spin_unlock(&q->lock); spin_unlock(&q->lock);
wmb();
t3_write_reg(qs->adap, A_SG_KDOORBELL, t3_write_reg(qs->adap, A_SG_KDOORBELL,
F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id));
} }
@ -1572,6 +1574,7 @@ static void restart_offloadq(unsigned long data)
set_bit(TXQ_RUNNING, &q->flags); set_bit(TXQ_RUNNING, &q->flags);
set_bit(TXQ_LAST_PKT_DB, &q->flags); set_bit(TXQ_LAST_PKT_DB, &q->flags);
#endif #endif
wmb();
t3_write_reg(adap, A_SG_KDOORBELL, t3_write_reg(adap, A_SG_KDOORBELL,
F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id));
} }
@ -1737,7 +1740,6 @@ static inline int rx_offload(struct t3cdev *tdev, struct sge_rspq *rq,
struct sk_buff *skb, struct sk_buff *rx_gather[], struct sk_buff *skb, struct sk_buff *rx_gather[],
unsigned int gather_idx) unsigned int gather_idx)
{ {
rq->offload_pkts++;
skb_reset_mac_header(skb); skb_reset_mac_header(skb);
skb_reset_network_header(skb); skb_reset_network_header(skb);
skb_reset_transport_header(skb); skb_reset_transport_header(skb);
@ -2031,6 +2033,7 @@ no_mem:
if (eth) if (eth)
rx_eth(adap, q, skb, ethpad); rx_eth(adap, q, skb, ethpad);
else { else {
q->offload_pkts++;
/* Preserve the RSS info in csum & priority */ /* Preserve the RSS info in csum & priority */
skb->csum = rss_hi; skb->csum = rss_hi;
skb->priority = rss_lo; skb->priority = rss_lo;