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Date: Wed, 14 Jan 2009 18:42:47 +0200
From: "Eilon Greenstein" <eilong@...adcom.com>
To: "David Miller" <davem@...emloft.net>,
netdev <netdev@...r.kernel.org>
Subject: [PATCH 03/34]bnx2x: Missing memory barriers
While working on IA64, it became clear that the following memory barriers are
missing
Signed-off-by: Eilon Greenstein <eilong@...adcom.com>
---
drivers/net/bnx2x_main.c | 28 ++++++++++++++++++++++++++--
1 files changed, 26 insertions(+), 2 deletions(-)
diff --git a/drivers/net/bnx2x_main.c b/drivers/net/bnx2x_main.c
index b8bc1a5..5a0a285 100644
--- a/drivers/net/bnx2x_main.c
+++ b/drivers/net/bnx2x_main.c
@@ -1368,11 +1368,23 @@ static inline void bnx2x_update_rx_prod(struct bnx2x *bp,
rx_prods.cqe_prod = rx_comp_prod;
rx_prods.sge_prod = rx_sge_prod;
+ /*
+ * Make sure that the BD and SGE data is updated before updating the
+ * producers since FW might read the BD/SGE right after the producer
+ * is updated.
+ * This is only applicable for weak-ordered memory model archs such
+ * as IA-64. The following barrier is also mandatory since FW will
+ * assumes BDs must have buffers.
+ */
+ wmb();
+
for (i = 0; i < sizeof(struct tstorm_eth_rx_producers)/4; i++)
REG_WR(bp, BAR_TSTRORM_INTMEM +
TSTORM_RX_PRODS_OFFSET(BP_PORT(bp), FP_CL_ID(fp)) + i*4,
((u32 *)&rx_prods)[i]);
+ mmiowb(); /* keep prod updates ordered */
+
DP(NETIF_MSG_RX_STATUS,
"Wrote: bd_prod %u cqe_prod %u sge_prod %u\n",
bd_prod, rx_comp_prod, rx_sge_prod);
@@ -1593,7 +1605,6 @@ next_cqe:
/* Update producers */
bnx2x_update_rx_prod(bp, fp, bd_prod_fw, sw_comp_prod,
fp->rx_sge_prod);
- mmiowb(); /* keep prod updates ordered */
fp->rx_pkt += rx_pkt;
fp->rx_calls++;
@@ -8740,6 +8751,8 @@ static int bnx2x_run_loopback(struct bnx2x *bp, int loopback_mode, u8 link_up)
tx_bd->general_data = ((UNICAST_ADDRESS <<
ETH_TX_BD_ETH_ADDR_TYPE_SHIFT) | 1);
+ wmb();
+
fp->hw_tx_prods->bds_prod =
cpu_to_le16(le16_to_cpu(fp->hw_tx_prods->bds_prod) + 1);
mb(); /* FW restriction: must not reorder writing nbd and packets */
@@ -8791,7 +8804,6 @@ test_loopback_rx_exit:
/* Update producers */
bnx2x_update_rx_prod(bp, fp, fp->rx_bd_prod, fp->rx_comp_prod,
fp->rx_sge_prod);
- mmiowb(); /* keep prod updates ordered */
test_loopback_exit:
bp->link_params.loopback_mode = LOOPBACK_NONE;
@@ -9722,6 +9734,15 @@ static int bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
DP(NETIF_MSG_TX_QUEUED, "doorbell: nbd %d bd %u\n", nbd, bd_prod);
+ /*
+ * Make sure that the BD data is updated before updating the producer
+ * since FW might read the BD right after the producer is updated.
+ * This is only applicable for weak-ordered memory model archs such
+ * as IA-64. The following barrier is also mandatory since FW will
+ * assumes packets must have BDs.
+ */
+ wmb();
+
fp->hw_tx_prods->bds_prod =
cpu_to_le16(le16_to_cpu(fp->hw_tx_prods->bds_prod) + nbd);
mb(); /* FW restriction: must not reorder writing nbd and packets */
@@ -9735,6 +9756,9 @@ static int bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
dev->trans_start = jiffies;
if (unlikely(bnx2x_tx_avail(fp) < MAX_SKB_FRAGS + 3)) {
+ /* We want bnx2x_tx_int to "see" the updated tx_bd_prod
+ if we put Tx into XOFF state. */
+ smp_mb();
netif_stop_queue(dev);
bp->eth_stats.driver_xoff++;
if (bnx2x_tx_avail(fp) >= MAX_SKB_FRAGS + 3)
--
1.5.4.3
--
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