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bnx2x: replace mechanism to check for next available packet

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Check next packet availability by validating that HW has finished CQE
placement. This saves latency of another dma transaction performed to update
SB indexes.

Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Kravkov 2013-06-19 01:36:05 +03:00 committed by David S. Miller
parent 8f20aa575c
commit 75b2945988
4 changed files with 42 additions and 37 deletions
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49
drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
View File

@ -804,40 +804,32 @@ int bnx2x_rx_int(struct bnx2x_fastpath *fp, int budget)
{
struct bnx2x *bp = fp->bp;
u16 bd_cons, bd_prod, bd_prod_fw, comp_ring_cons;
u16 hw_comp_cons, sw_comp_cons, sw_comp_prod;
u16 sw_comp_cons, sw_comp_prod;
int rx_pkt = 0;
union eth_rx_cqe *cqe;
struct eth_fast_path_rx_cqe *cqe_fp;
#ifdef BNX2X_STOP_ON_ERROR
if (unlikely(bp->panic))
return 0;
#endif
/* CQ "next element" is of the size of the regular element,
that's why it's ok here */
hw_comp_cons = le16_to_cpu(*fp->rx_cons_sb);
if ((hw_comp_cons & MAX_RCQ_DESC_CNT) == MAX_RCQ_DESC_CNT)
hw_comp_cons++;
bd_cons = fp->rx_bd_cons;
bd_prod = fp->rx_bd_prod;
bd_prod_fw = bd_prod;
sw_comp_cons = fp->rx_comp_cons;
sw_comp_prod = fp->rx_comp_prod;
/* Memory barrier necessary as speculative reads of the rx
* buffer can be ahead of the index in the status block
*/
rmb();
comp_ring_cons = RCQ_BD(sw_comp_cons);
cqe = &fp->rx_comp_ring[comp_ring_cons];
cqe_fp = &cqe->fast_path_cqe;
DP(NETIF_MSG_RX_STATUS,
"queue[%d]: hw_comp_cons %u sw_comp_cons %u\n",
fp->index, hw_comp_cons, sw_comp_cons);
"queue[%d]: sw_comp_cons %u\n", fp->index, sw_comp_cons);
while (sw_comp_cons != hw_comp_cons) {
while (BNX2X_IS_CQE_COMPLETED(cqe_fp)) {
struct sw_rx_bd *rx_buf = NULL;
struct sk_buff *skb;
union eth_rx_cqe *cqe;
struct eth_fast_path_rx_cqe *cqe_fp;
u8 cqe_fp_flags;
enum eth_rx_cqe_type cqe_fp_type;
u16 len, pad, queue;
@ -849,12 +841,9 @@ int bnx2x_rx_int(struct bnx2x_fastpath *fp, int budget)
return 0;
#endif
comp_ring_cons = RCQ_BD(sw_comp_cons);
bd_prod = RX_BD(bd_prod);
bd_cons = RX_BD(bd_cons);
cqe = &fp->rx_comp_ring[comp_ring_cons];
cqe_fp = &cqe->fast_path_cqe;
cqe_fp_flags = cqe_fp->type_error_flags;
cqe_fp_type = cqe_fp_flags & ETH_FAST_PATH_RX_CQE_TYPE;
@ -1018,8 +1007,15 @@ next_cqe:
sw_comp_prod = NEXT_RCQ_IDX(sw_comp_prod);
sw_comp_cons = NEXT_RCQ_IDX(sw_comp_cons);
/* mark CQE as free */
BNX2X_SEED_CQE(cqe_fp);
if (rx_pkt == budget)
break;
comp_ring_cons = RCQ_BD(sw_comp_cons);
cqe = &fp->rx_comp_ring[comp_ring_cons];
cqe_fp = &cqe->fast_path_cqe;
} /* while */
fp->rx_bd_cons = bd_cons;
@ -1055,8 +1051,6 @@ static irqreturn_t bnx2x_msix_fp_int(int irq, void *fp_cookie)
#endif
/* Handle Rx and Tx according to MSI-X vector */
prefetch(fp->rx_cons_sb);
for_each_cos_in_tx_queue(fp, cos)
prefetch(fp->txdata_ptr[cos]->tx_cons_sb);
@ -3137,10 +3131,8 @@ int bnx2x_low_latency_recv(struct napi_struct *napi)
if (!bnx2x_fp_lock_poll(fp))
return LL_FLUSH_BUSY;
if (bnx2x_has_rx_work(fp)) {
bnx2x_update_fpsb_idx(fp);
if (bnx2x_has_rx_work(fp))
found = bnx2x_rx_int(fp, 4);
}
bnx2x_fp_unlock_poll(fp);
@ -4339,10 +4331,11 @@ static int bnx2x_alloc_fp_mem_at(struct bnx2x *bp, int index)
&bnx2x_fp(bp, index, rx_desc_mapping),
sizeof(struct eth_rx_bd) * NUM_RX_BD);
BNX2X_PCI_ALLOC(bnx2x_fp(bp, index, rx_comp_ring),
&bnx2x_fp(bp, index, rx_comp_mapping),
sizeof(struct eth_fast_path_rx_cqe) *
NUM_RCQ_BD);
/* Seed all CQEs by 1s */
BNX2X_PCI_FALLOC(bnx2x_fp(bp, index, rx_comp_ring),
&bnx2x_fp(bp, index, rx_comp_mapping),
sizeof(struct eth_fast_path_rx_cqe) *
NUM_RCQ_BD);
/* SGE ring */
BNX2X_ALLOC(bnx2x_fp(bp, index, rx_page_ring),

26
drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
View File

@ -59,6 +59,16 @@ extern int int_mode;
(unsigned long long)(*y), x); \
} while (0)
#define BNX2X_PCI_FALLOC(x, y, size) \
do { \
x = dma_alloc_coherent(&bp->pdev->dev, size, y, GFP_KERNEL); \
if (x == NULL) \
goto alloc_mem_err; \
memset((void *)x, 0xFFFFFFFF, size); \
DP(NETIF_MSG_HW, "BNX2X_PCI_FALLOC: Physical %Lx Virtual %p\n",\
(unsigned long long)(*y), x); \
} while (0)
#define BNX2X_ALLOC(x, size) \
do { \
x = kzalloc(size, GFP_KERNEL); \
@ -805,16 +815,18 @@ static inline bool bnx2x_has_tx_work(struct bnx2x_fastpath *fp)
return false;
}
#define BNX2X_IS_CQE_COMPLETED(cqe_fp) (cqe_fp->marker == 0x0)
#define BNX2X_SEED_CQE(cqe_fp) (cqe_fp->marker = 0xFFFFFFFF)
static inline int bnx2x_has_rx_work(struct bnx2x_fastpath *fp)
{
u16 rx_cons_sb;
u16 cons;
union eth_rx_cqe *cqe;
struct eth_fast_path_rx_cqe *cqe_fp;
/* 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);
cons = RCQ_BD(fp->rx_comp_cons);
cqe = &fp->rx_comp_ring[cons];
cqe_fp = &cqe->fast_path_cqe;
return BNX2X_IS_CQE_COMPLETED(cqe_fp);
}
/**

3
drivers/net/ethernet/broadcom/bnx2x/bnx2x_hsi.h
View File

@ -3818,7 +3818,8 @@ struct eth_fast_path_rx_cqe {
__le16 len_on_bd;
struct parsing_flags pars_flags;
union eth_sgl_or_raw_data sgl_or_raw_data;
__le32 reserved1[8];
__le32 reserved1[7];
u32 marker;
};

1
drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
View File

@ -1866,7 +1866,6 @@ irqreturn_t bnx2x_interrupt(int irq, void *dev_instance)
mask = 0x2 << (fp->index + CNIC_SUPPORT(bp));
if (status & mask) {
/* Handle Rx or Tx according to SB id */
prefetch(fp->rx_cons_sb);
for_each_cos_in_tx_queue(fp, cos)
prefetch(fp->txdata_ptr[cos]->tx_cons_sb);
prefetch(&fp->sb_running_index[SM_RX_ID]);