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Date: Wed, 18 Jun 2008 17:25:27 -0700
From: "Michael Chan" <mchan@...adcom.com>
To: davem@...emloft.net
cc: netdev@...r.kernel.org, benli@...adcom.com,
"Michael Chan" <mchan@...adcom.com>
Subject: [PATCH 3/8] bnx2: Optimize fast-path tx and rx work.
Add hw_tx_cons_ptr and hw_rx_cons_ptr to speed up the retreival of
the tx and rx consumer index, since the MSI-X and default status
blocks have different structures.
Combine status_blk and status_blk_msix into a union. We'll only use
one type of status block for each vector.
Separate the code to detect more rx and tx work from the code to
detect link related work.
Signed-off-by: Michael Chan <mchan@...adcom.com>
Signed-off-by: Benjamin Li <benli@...adcom.com>
---
drivers/net/bnx2.c | 107 ++++++++++++++++++++++++++++++++--------------------
drivers/net/bnx2.h | 9 +++-
2 files changed, 72 insertions(+), 44 deletions(-)
diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index 4360528..cc70bdb 100644
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -624,6 +624,7 @@ static void
bnx2_free_mem(struct bnx2 *bp)
{
int i;
+ struct bnx2_napi *bnapi = &bp->bnx2_napi[0];
bnx2_free_tx_mem(bp);
bnx2_free_rx_mem(bp);
@@ -636,10 +637,11 @@ bnx2_free_mem(struct bnx2 *bp)
bp->ctx_blk[i] = NULL;
}
}
- if (bp->status_blk) {
+ if (bnapi->status_blk.msi) {
pci_free_consistent(bp->pdev, bp->status_stats_size,
- bp->status_blk, bp->status_blk_mapping);
- bp->status_blk = NULL;
+ bnapi->status_blk.msi,
+ bp->status_blk_mapping);
+ bnapi->status_blk.msi = NULL;
bp->stats_blk = NULL;
}
}
@@ -648,6 +650,8 @@ static int
bnx2_alloc_mem(struct bnx2 *bp)
{
int i, status_blk_size, err;
+ struct bnx2_napi *bnapi;
+ void *status_blk;
/* Combine status and statistics blocks into one allocation. */
status_blk_size = L1_CACHE_ALIGN(sizeof(struct status_block));
@@ -657,27 +661,37 @@ bnx2_alloc_mem(struct bnx2 *bp)
bp->status_stats_size = status_blk_size +
sizeof(struct statistics_block);
- bp->status_blk = pci_alloc_consistent(bp->pdev, bp->status_stats_size,
- &bp->status_blk_mapping);
- if (bp->status_blk == NULL)
+ status_blk = pci_alloc_consistent(bp->pdev, bp->status_stats_size,
+ &bp->status_blk_mapping);
+ if (status_blk == NULL)
goto alloc_mem_err;
- memset(bp->status_blk, 0, bp->status_stats_size);
+ memset(status_blk, 0, bp->status_stats_size);
- bp->bnx2_napi[0].status_blk = bp->status_blk;
+ bnapi = &bp->bnx2_napi[0];
+ bnapi->status_blk.msi = status_blk;
+ bnapi->hw_tx_cons_ptr =
+ &bnapi->status_blk.msi->status_tx_quick_consumer_index0;
+ bnapi->hw_rx_cons_ptr =
+ &bnapi->status_blk.msi->status_rx_quick_consumer_index0;
if (bp->flags & BNX2_FLAG_MSIX_CAP) {
for (i = 1; i < BNX2_MAX_MSIX_VEC; i++) {
- struct bnx2_napi *bnapi = &bp->bnx2_napi[i];
+ struct status_block_msix *sblk;
+
+ bnapi = &bp->bnx2_napi[i];
- bnapi->status_blk_msix = (void *)
- ((unsigned long) bp->status_blk +
- BNX2_SBLK_MSIX_ALIGN_SIZE * i);
+ sblk = (void *) (status_blk +
+ BNX2_SBLK_MSIX_ALIGN_SIZE * i);
+ bnapi->status_blk.msix = sblk;
+ bnapi->hw_tx_cons_ptr =
+ &sblk->status_tx_quick_consumer_index;
+ bnapi->hw_rx_cons_ptr =
+ &sblk->status_rx_quick_consumer_index;
bnapi->int_num = i << 24;
}
}
- bp->stats_blk = (void *) ((unsigned long) bp->status_blk +
- status_blk_size);
+ bp->stats_blk = status_blk + status_blk_size;
bp->stats_blk_mapping = bp->status_blk_mapping + status_blk_size;
@@ -2515,7 +2529,7 @@ bnx2_alloc_rx_skb(struct bnx2 *bp, struct bnx2_rx_ring_info *rxr, u16 index)
static int
bnx2_phy_event_is_set(struct bnx2 *bp, struct bnx2_napi *bnapi, u32 event)
{
- struct status_block *sblk = bnapi->status_blk;
+ struct status_block *sblk = bnapi->status_blk.msi;
u32 new_link_state, old_link_state;
int is_set = 1;
@@ -2551,11 +2565,9 @@ bnx2_get_hw_tx_cons(struct bnx2_napi *bnapi)
{
u16 cons;
- if (bnapi->int_num == 0)
- cons = bnapi->status_blk->status_tx_quick_consumer_index0;
- else
- cons = bnapi->status_blk_msix->status_tx_quick_consumer_index;
-
+ /* Tell compiler that status block fields can change. */
+ barrier();
+ cons = *bnapi->hw_tx_cons_ptr;
if (unlikely((cons & MAX_TX_DESC_CNT) == MAX_TX_DESC_CNT))
cons++;
return cons;
@@ -2822,11 +2834,9 @@ bnx2_get_hw_rx_cons(struct bnx2_napi *bnapi)
{
u16 cons;
- if (bnapi->int_num == 0)
- cons = bnapi->status_blk->status_rx_quick_consumer_index0;
- else
- cons = bnapi->status_blk_msix->status_rx_quick_consumer_index;
-
+ /* Tell compiler that status block fields can change. */
+ barrier();
+ cons = *bnapi->hw_rx_cons_ptr;
if (unlikely((cons & MAX_RX_DESC_CNT) == MAX_RX_DESC_CNT))
cons++;
return cons;
@@ -2990,7 +3000,7 @@ bnx2_msi(int irq, void *dev_instance)
struct bnx2 *bp = netdev_priv(dev);
struct bnx2_napi *bnapi = &bp->bnx2_napi[0];
- prefetch(bnapi->status_blk);
+ prefetch(bnapi->status_blk.msi);
REG_WR(bp, BNX2_PCICFG_INT_ACK_CMD,
BNX2_PCICFG_INT_ACK_CMD_USE_INT_HC_PARAM |
BNX2_PCICFG_INT_ACK_CMD_MASK_INT);
@@ -3011,7 +3021,7 @@ bnx2_msi_1shot(int irq, void *dev_instance)
struct bnx2 *bp = netdev_priv(dev);
struct bnx2_napi *bnapi = &bp->bnx2_napi[0];
- prefetch(bnapi->status_blk);
+ prefetch(bnapi->status_blk.msi);
/* Return here if interrupt is disabled. */
if (unlikely(atomic_read(&bp->intr_sem) != 0))
@@ -3028,7 +3038,7 @@ bnx2_interrupt(int irq, void *dev_instance)
struct net_device *dev = dev_instance;
struct bnx2 *bp = netdev_priv(dev);
struct bnx2_napi *bnapi = &bp->bnx2_napi[0];
- struct status_block *sblk = bnapi->status_blk;
+ struct status_block *sblk = bnapi->status_blk.msi;
/* When using INTx, it is possible for the interrupt to arrive
* at the CPU before the status block posted prior to the
@@ -3069,7 +3079,7 @@ bnx2_tx_msix(int irq, void *dev_instance)
struct bnx2 *bp = netdev_priv(dev);
struct bnx2_napi *bnapi = &bp->bnx2_napi[BNX2_TX_VEC];
- prefetch(bnapi->status_blk_msix);
+ prefetch(bnapi->status_blk.msix);
/* Return here if interrupt is disabled. */
if (unlikely(atomic_read(&bp->intr_sem) != 0))
@@ -3079,19 +3089,28 @@ bnx2_tx_msix(int irq, void *dev_instance)
return IRQ_HANDLED;
}
-#define STATUS_ATTN_EVENTS (STATUS_ATTN_BITS_LINK_STATE | \
- STATUS_ATTN_BITS_TIMER_ABORT)
-
static inline int
-bnx2_has_work(struct bnx2_napi *bnapi)
+bnx2_has_fast_work(struct bnx2_napi *bnapi)
{
struct bnx2_tx_ring_info *txr = &bnapi->tx_ring;
struct bnx2_rx_ring_info *rxr = &bnapi->rx_ring;
- struct status_block *sblk = bnapi->status_blk;
if ((bnx2_get_hw_rx_cons(bnapi) != rxr->rx_cons) ||
(bnx2_get_hw_tx_cons(bnapi) != txr->hw_tx_cons))
return 1;
+ return 0;
+}
+
+#define STATUS_ATTN_EVENTS (STATUS_ATTN_BITS_LINK_STATE | \
+ STATUS_ATTN_BITS_TIMER_ABORT)
+
+static inline int
+bnx2_has_work(struct bnx2_napi *bnapi)
+{
+ struct status_block *sblk = bnapi->status_blk.msi;
+
+ if (bnx2_has_fast_work(bnapi))
+ return 1;
if ((sblk->status_attn_bits & STATUS_ATTN_EVENTS) !=
(sblk->status_attn_bits_ack & STATUS_ATTN_EVENTS))
@@ -3106,7 +3125,7 @@ static int bnx2_tx_poll(struct napi_struct *napi, int budget)
struct bnx2 *bp = bnapi->bp;
struct bnx2_tx_ring_info *txr = &bnapi->tx_ring;
int work_done = 0;
- struct status_block_msix *sblk = bnapi->status_blk_msix;
+ struct status_block_msix *sblk = bnapi->status_blk.msix;
do {
work_done += bnx2_tx_int(bp, bnapi, budget - work_done);
@@ -3124,12 +3143,9 @@ static int bnx2_tx_poll(struct napi_struct *napi, int budget)
return work_done;
}
-static int bnx2_poll_work(struct bnx2 *bp, struct bnx2_napi *bnapi,
- int work_done, int budget)
+static int bnx2_poll_link(struct bnx2 *bp, struct bnx2_napi *bnapi)
{
- struct bnx2_tx_ring_info *txr = &bnapi->tx_ring;
- struct bnx2_rx_ring_info *rxr = &bnapi->rx_ring;
- struct status_block *sblk = bnapi->status_blk;
+ struct status_block *sblk = bnapi->status_blk.msi;
u32 status_attn_bits = sblk->status_attn_bits;
u32 status_attn_bits_ack = sblk->status_attn_bits_ack;
@@ -3145,6 +3161,13 @@ static int bnx2_poll_work(struct bnx2 *bp, struct bnx2_napi *bnapi,
bp->hc_cmd | BNX2_HC_COMMAND_COAL_NOW_WO_INT);
REG_RD(bp, BNX2_HC_COMMAND);
}
+}
+
+static int bnx2_poll_work(struct bnx2 *bp, struct bnx2_napi *bnapi,
+ int work_done, int budget)
+{
+ struct bnx2_tx_ring_info *txr = &bnapi->tx_ring;
+ struct bnx2_rx_ring_info *rxr = &bnapi->rx_ring;
if (bnx2_get_hw_tx_cons(bnapi) != txr->hw_tx_cons)
bnx2_tx_int(bp, bnapi, 0);
@@ -3160,9 +3183,11 @@ static int bnx2_poll(struct napi_struct *napi, int budget)
struct bnx2_napi *bnapi = container_of(napi, struct bnx2_napi, napi);
struct bnx2 *bp = bnapi->bp;
int work_done = 0;
- struct status_block *sblk = bnapi->status_blk;
+ struct status_block *sblk = bnapi->status_blk.msi;
while (1) {
+ bnx2_poll_link(bp, bnapi);
+
work_done = bnx2_poll_work(bp, bnapi, work_done, budget);
if (unlikely(work_done >= budget))
diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
index 1c5ce80..362bef6 100644
--- a/drivers/net/bnx2.h
+++ b/drivers/net/bnx2.h
@@ -6609,8 +6609,12 @@ struct bnx2_rx_ring_info {
struct bnx2_napi {
struct napi_struct napi ____cacheline_aligned;
struct bnx2 *bp;
- struct status_block *status_blk;
- struct status_block_msix *status_blk_msix;
+ union {
+ struct status_block *msi;
+ struct status_block_msix *msix;
+ } status_blk;
+ u16 *hw_tx_cons_ptr;
+ u16 *hw_rx_cons_ptr;
u32 last_status_idx;
u32 int_num;
@@ -6759,7 +6763,6 @@ struct bnx2 {
u32 stats_ticks;
- struct status_block *status_blk;
dma_addr_t status_blk_mapping;
struct statistics_block *stats_blk;
--
1.5.5.GIT
--
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