cxgb3 - Fix I/O synchronization
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>
diff --git a/drivers/net/cxgb3/sge.c b/drivers/net/cxgb3/sge.c
index 7b13d8a..666c317 100644
--- a/drivers/net/cxgb3/sge.c
+++ b/drivers/net/cxgb3/sge.c
@@ -174,6 +174,7 @@
static inline void refill_rspq(struct adapter *adapter,
const struct sge_rspq *q, unsigned int credits)
{
+ rmb();
t3_write_reg(adapter, A_SG_RSPQ_CREDIT_RETURN,
V_RSPQ(q->cntxt_id) | V_CREDITS(credits));
}
@@ -458,7 +459,7 @@
}
q->credits++;
}
-
+ wmb();
t3_write_reg(adap, A_SG_KDOORBELL, V_EGRCNTX(q->cntxt_id));
}
@@ -1353,6 +1354,7 @@
}
spin_unlock(&q->lock);
+ wmb();
t3_write_reg(qs->adap, A_SG_KDOORBELL,
F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id));
}
@@ -1572,6 +1574,7 @@
set_bit(TXQ_RUNNING, &q->flags);
set_bit(TXQ_LAST_PKT_DB, &q->flags);
#endif
+ wmb();
t3_write_reg(adap, A_SG_KDOORBELL,
F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id));
}
@@ -1737,7 +1740,6 @@
struct sk_buff *skb, struct sk_buff *rx_gather[],
unsigned int gather_idx)
{
- rq->offload_pkts++;
skb_reset_mac_header(skb);
skb_reset_network_header(skb);
skb_reset_transport_header(skb);
@@ -2031,6 +2033,7 @@
if (eth)
rx_eth(adap, q, skb, ethpad);
else {
+ q->offload_pkts++;
/* Preserve the RSS info in csum & priority */
skb->csum = rss_hi;
skb->priority = rss_lo;