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bnx2x: Barriers for the compiler

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To make sure no swapping are made by the compiler, changed HAS_WORK to inline
functions and added all the necessary barriers

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 06:42:44 +00:00 committed by David S. Miller
parent e47d7e6eb8
commit 237907c1de
2 changed files with 27 additions and 19 deletions
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9
drivers/net/bnx2x.h
View file

@ -271,14 +271,7 @@ struct bnx2x_fastpath {
#define bnx2x_fp(bp, nr, var) (bp->fp[nr].var)
#define BNX2X_HAS_TX_WORK(fp) \
((fp->tx_pkt_prod != le16_to_cpu(*fp->tx_cons_sb)) || \
(fp->tx_pkt_prod != fp->tx_pkt_cons))
#define BNX2X_HAS_RX_WORK(fp) \
(fp->rx_comp_cons != rx_cons_sb)
#define BNX2X_HAS_WORK(fp) (BNX2X_HAS_RX_WORK(fp) || BNX2X_HAS_TX_WORK(fp))
#define BNX2X_HAS_WORK(fp) (bnx2x_has_rx_work(fp) || bnx2x_has_tx_work(fp))
/* MC hsi */

37
drivers/net/bnx2x_main.c
View file

@ -733,6 +733,17 @@ static u16 bnx2x_ack_int(struct bnx2x *bp)
* fast path service functions
*/
static inline int bnx2x_has_tx_work(struct bnx2x_fastpath *fp)
{
u16 tx_cons_sb;
/* Tell compiler that status block fields can change */
barrier();
tx_cons_sb = le16_to_cpu(*fp->tx_cons_sb);
return ((fp->tx_pkt_prod != tx_cons_sb) ||
(fp->tx_pkt_prod != fp->tx_pkt_cons));
}
/* free skb in the packet ring at pos idx
* return idx of last bd freed
*/
@ -6693,7 +6704,7 @@ static int bnx2x_nic_unload(struct bnx2x *bp, int unload_mode)
cnt = 1000;
smp_rmb();
while (BNX2X_HAS_TX_WORK(fp)) {
while (bnx2x_has_tx_work(fp)) {
bnx2x_tx_int(fp, 1000);
if (!cnt) {
@ -9281,6 +9292,18 @@ static int bnx2x_set_power_state(struct bnx2x *bp, pci_power_t state)
return 0;
}
static inline int bnx2x_has_rx_work(struct bnx2x_fastpath *fp)
{
u16 rx_cons_sb;
/* Tell compiler that status block fields can change */
barrier();
rx_cons_sb = le16_to_cpu(*fp->rx_cons_sb);
if ((rx_cons_sb & MAX_RCQ_DESC_CNT) == MAX_RCQ_DESC_CNT)
rx_cons_sb++;
return (fp->rx_comp_cons != rx_cons_sb);
}
/*
* net_device service functions
*/
@ -9291,7 +9314,6 @@ static int bnx2x_poll(struct napi_struct *napi, int budget)
napi);
struct bnx2x *bp = fp->bp;
int work_done = 0;
u16 rx_cons_sb;
#ifdef BNX2X_STOP_ON_ERROR
if (unlikely(bp->panic))
@ -9304,19 +9326,12 @@ static int bnx2x_poll(struct napi_struct *napi, int budget)
bnx2x_update_fpsb_idx(fp);
if (BNX2X_HAS_TX_WORK(fp))
if (bnx2x_has_tx_work(fp))
bnx2x_tx_int(fp, budget);
rx_cons_sb = le16_to_cpu(*fp->rx_cons_sb);
if ((rx_cons_sb & MAX_RCQ_DESC_CNT) == MAX_RCQ_DESC_CNT)
rx_cons_sb++;
if (BNX2X_HAS_RX_WORK(fp))
if (bnx2x_has_rx_work(fp))
work_done = bnx2x_rx_int(fp, budget);
rmb(); /* BNX2X_HAS_WORK() reads the status block */
rx_cons_sb = le16_to_cpu(*fp->rx_cons_sb);
if ((rx_cons_sb & MAX_RCQ_DESC_CNT) == MAX_RCQ_DESC_CNT)
rx_cons_sb++;
/* must not complete if we consumed full budget */
if ((work_done < budget) && !BNX2X_HAS_WORK(fp)) {