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cxgb3: add memory barriers

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Add memory barriers to fix crashes observed on newest PowerPC platforms.
The HW and driver state of the receive rings were getting out of sync.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Divy Le Ray 2010-02-01 10:29:29 +00:00 committed by David S. Miller
parent ace2a4d0fb
commit 2e02644abc
1 changed files with 12 additions and 4 deletions
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16
drivers/net/cxgb3/sge.c
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@ -480,6 +480,7 @@ static inline void ring_fl_db(struct adapter *adap, struct sge_fl *q)
{
if (q->pend_cred >= q->credits / 4) {
q->pend_cred = 0;
wmb();
t3_write_reg(adap, A_SG_KDOORBELL, V_EGRCNTX(q->cntxt_id));
}
}
@ -2282,11 +2283,14 @@ static int process_responses(struct adapter *adap, struct sge_qset *qs,
while (likely(budget_left && is_new_response(r, q))) {
int packet_complete, eth, ethpad = 2, lro = qs->lro_enabled;
struct sk_buff *skb = NULL;
u32 len, flags = ntohl(r->flags);
__be32 rss_hi = *(const __be32 *)r,
rss_lo = r->rss_hdr.rss_hash_val;
u32 len, flags;
__be32 rss_hi, rss_lo;
rmb();
eth = r->rss_hdr.opcode == CPL_RX_PKT;
rss_hi = *(const __be32 *)r;
rss_lo = r->rss_hdr.rss_hash_val;
flags = ntohl(r->flags);
if (unlikely(flags & F_RSPD_ASYNC_NOTIF)) {
skb = alloc_skb(AN_PKT_SIZE, GFP_ATOMIC);
@ -2497,7 +2501,10 @@ static int process_pure_responses(struct adapter *adap, struct sge_qset *qs,
refill_rspq(adap, q, q->credits);
q->credits = 0;
}
} while (is_new_response(r, q) && is_pure_response(r));
if (!is_new_response(r, q))
break;
rmb();
} while (is_pure_response(r));
if (sleeping)
check_ring_db(adap, qs, sleeping);
@ -2531,6 +2538,7 @@ static inline int handle_responses(struct adapter *adap, struct sge_rspq *q)
if (!is_new_response(r, q))
return -1;
rmb();
if (is_pure_response(r) && process_pure_responses(adap, qs, r) == 0) {
t3_write_reg(adap, A_SG_GTS, V_RSPQ(q->cntxt_id) |
V_NEWTIMER(q->holdoff_tmr) | V_NEWINDEX(q->cidx));