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Date: Wed, 6 Oct 2010 15:27:41 +0200
From: "Dmitry Kravkov" <dmitry@...adcom.com>
To: davem@...emloft.net, netdev@...r.kernel.org
cc: eilong@...adcom.com, mchan@...adcom.com
Subject: [PATCH net-next 09/19] bnx2x: change type of spq_left to atomic
The field is now accessed from different contexts.
Signed-off-by: Dmitry Kravkov <dmitry@...adcom.com>
Signed-off-by: Eilon Greenstein <eilong@...adcom.com>
---
drivers/net/bnx2x/bnx2x.h | 2 +-
drivers/net/bnx2x/bnx2x_main.c | 17 +++++++++--------
drivers/net/bnx2x/bnx2x_stats.c | 5 +----
3 files changed, 11 insertions(+), 13 deletions(-)
diff --git a/drivers/net/bnx2x/bnx2x.h b/drivers/net/bnx2x/bnx2x.h
index d7b24f9..09fb7ff 100644
--- a/drivers/net/bnx2x/bnx2x.h
+++ b/drivers/net/bnx2x/bnx2x.h
@@ -860,7 +860,7 @@ struct bnx2x {
struct eth_spe *spq_prod_bd;
struct eth_spe *spq_last_bd;
__le16 *dsb_sp_prod;
- u16 spq_left; /* serialize spq */
+ atomic_t spq_left; /* serialize spq */
/* used to synchronize spq accesses */
spinlock_t spq_lock;
diff --git a/drivers/net/bnx2x/bnx2x_main.c b/drivers/net/bnx2x/bnx2x_main.c
index 238e38f..2c04b97 100644
--- a/drivers/net/bnx2x/bnx2x_main.c
+++ b/drivers/net/bnx2x/bnx2x_main.c
@@ -1161,8 +1161,8 @@ void bnx2x_sp_event(struct bnx2x_fastpath *fp,
break;
}
- bp->spq_left++;
-
+ smp_mb__before_atomic_inc();
+ atomic_inc(&bp->spq_left);
/* push the change in fp->state and towards the memory */
smp_wmb();
@@ -2432,7 +2432,7 @@ int bnx2x_sp_post(struct bnx2x *bp, int command, int cid,
spin_lock_bh(&bp->spq_lock);
- if (!bp->spq_left) {
+ if (!atomic_read(&bp->spq_left)) {
BNX2X_ERR("BUG! SPQ ring full!\n");
spin_unlock_bh(&bp->spq_lock);
bnx2x_panic();
@@ -2472,7 +2472,7 @@ int bnx2x_sp_post(struct bnx2x *bp, int command, int cid,
* somewhere between the spin_lock and spin_unlock. Thus no
* more explict memory barrier is needed.
*/
- bp->spq_left--;
+ atomic_dec(&bp->spq_left);
DP(BNX2X_MSG_SP/*NETIF_MSG_TIMER*/,
"SPQE[%x] (%x:%x) command %d hw_cid %x data (%x:%x) "
@@ -2480,7 +2480,7 @@ int bnx2x_sp_post(struct bnx2x *bp, int command, int cid,
bp->spq_prod_idx, (u32)U64_HI(bp->spq_mapping),
(u32)(U64_LO(bp->spq_mapping) +
(void *)bp->spq_prod_bd - (void *)bp->spq), command,
- HW_CID(bp, cid), data_hi, data_lo, type, bp->spq_left);
+ HW_CID(bp, cid), data_hi, data_lo, type, atomic_read(&bp->spq_left));
bnx2x_sp_prod_update(bp);
spin_unlock_bh(&bp->spq_lock);
@@ -3290,7 +3290,7 @@ static void bnx2x_eq_int(struct bnx2x *bp)
sw_prod = bp->eq_prod;
DP(BNX2X_MSG_SP, "EQ: hw_cons %u sw_cons %u bp->spq_left %u\n",
- hw_cons, sw_cons, bp->spq_left);
+ hw_cons, sw_cons, atomic_read(&bp->spq_left));
for (; sw_cons != hw_cons;
sw_prod = NEXT_EQ_IDX(sw_prod), sw_cons = NEXT_EQ_IDX(sw_cons)) {
@@ -3360,7 +3360,8 @@ next_spqe:
spqe_cnt++;
} /* for */
- bp->spq_left++;
+ smp_mb__before_atomic_inc();
+ atomic_add(spqe_cnt, &bp->spq_left);
bp->eq_cons = sw_cons;
bp->eq_prod = sw_prod;
@@ -3737,8 +3738,8 @@ void bnx2x_update_coalesce(struct bnx2x *bp)
static void bnx2x_init_sp_ring(struct bnx2x *bp)
{
spin_lock_init(&bp->spq_lock);
+ atomic_set(&bp->spq_left, MAX_SPQ_PENDING);
- bp->spq_left = MAX_SPQ_PENDING;
bp->spq_prod_idx = 0;
bp->dsb_sp_prod = BNX2X_SP_DSB_INDEX;
bp->spq_prod_bd = bp->spq;
diff --git a/drivers/net/bnx2x/bnx2x_stats.c b/drivers/net/bnx2x/bnx2x_stats.c
index c271fc5..32b6b10 100644
--- a/drivers/net/bnx2x/bnx2x_stats.c
+++ b/drivers/net/bnx2x/bnx2x_stats.c
@@ -166,11 +166,8 @@ static void bnx2x_storm_stats_post(struct bnx2x *bp)
rc = bnx2x_sp_post(bp, RAMROD_CMD_ID_COMMON_STAT_QUERY, 0,
((u32 *)&ramrod_data)[1],
((u32 *)&ramrod_data)[0], 1);
- if (rc == 0) {
- /* stats ramrod has it's own slot on the spq */
- bp->spq_left++;
+ if (rc == 0)
bp->stats_pending = 1;
- }
spin_unlock_bh(&bp->stats_lock);
}
--
1.7.1
--
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