AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-11-26 12:30:54 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

bnx2x: Missing memory barriers

Browse Source 
While working on IA64, it became clear that the following memory
barriers are missing

Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eilon Greenstein 2009-01-14 21:23:36 -08:00 committed by David S. Miller
parent 1cf167f27a
commit 58f4c4cfce
1 changed files with 26 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/net/bnx2x_main.c
View File

@ -1357,11 +1357,23 @@ 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);
@ -1582,7 +1594,6 @@ static int bnx2x_rx_int(struct bnx2x_fastpath *fp, int budget)
/* 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++;
@ -8729,6 +8740,8 @@ 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 */
@ -8780,7 +8793,6 @@ static int bnx2x_run_loopback(struct bnx2x *bp, int loopback_mode, u8 link_up)
/* 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;
@ -9707,6 +9719,15 @@ 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 */
@ -9720,6 +9741,9 @@ 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)