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[PATCH] bnx2: refine bnx2_poll 

Refine bnx2_poll() logic to write back the most up-to-date status tag
when all work has been processed. This eliminates some occasional
extra interrupts when a older status tag is written even though all
work has been processed.

The idea is to read the status tag just before exiting bnx2_poll() and
then check again for any new work. If no new work is pending, the
status tag written back will not generate any extra interrupt. This
logic is similar to the changes David Miller did to tg3_poll().

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Michael Chan 2005-11-04 08:53:48 -08:00 committed by John W. Linville
parent e3648b3d8d
commit f4e418f7f3
2 changed files with 43 additions and 15 deletions
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55
drivers/net/bnx2.c
View File

@ -1533,10 +1533,11 @@ bnx2_phy_int(struct bnx2 *bp)
static void
bnx2_tx_int(struct bnx2 *bp)
{
struct status_block *sblk = bp->status_blk;
u16 hw_cons, sw_cons, sw_ring_cons;
int tx_free_bd = 0;
hw_cons = bp->status_blk->status_tx_quick_consumer_index0;
hw_cons = bp->hw_tx_cons = sblk->status_tx_quick_consumer_index0;
if ((hw_cons & MAX_TX_DESC_CNT) == MAX_TX_DESC_CNT) {
hw_cons++;
}
@ -1591,7 +1592,9 @@ bnx2_tx_int(struct bnx2 *bp)
dev_kfree_skb_irq(skb);
hw_cons = bp->status_blk->status_tx_quick_consumer_index0;
hw_cons = bp->hw_tx_cons =
sblk->status_tx_quick_consumer_index0;
if ((hw_cons & MAX_TX_DESC_CNT) == MAX_TX_DESC_CNT) {
hw_cons++;
}
@ -1636,11 +1639,12 @@ bnx2_reuse_rx_skb(struct bnx2 *bp, struct sk_buff *skb,
static int
bnx2_rx_int(struct bnx2 *bp, int budget)
{
struct status_block *sblk = bp->status_blk;
u16 hw_cons, sw_cons, sw_ring_cons, sw_prod, sw_ring_prod;
struct l2_fhdr *rx_hdr;
int rx_pkt = 0;
hw_cons = bp->status_blk->status_rx_quick_consumer_index0;
hw_cons = bp->hw_rx_cons = sblk->status_rx_quick_consumer_index0;
if ((hw_cons & MAX_RX_DESC_CNT) == MAX_RX_DESC_CNT) {
hw_cons++;
}
@ -1760,6 +1764,15 @@ next_rx:
if ((rx_pkt == budget))
break;
/* Refresh hw_cons to see if there is new work */
if (sw_cons == hw_cons) {
hw_cons = bp->hw_rx_cons =
sblk->status_rx_quick_consumer_index0;
if ((hw_cons & MAX_RX_DESC_CNT) == MAX_RX_DESC_CNT)
hw_cons++;
rmb();
}
}
bp->rx_cons = sw_cons;
bp->rx_prod = sw_prod;
@ -1827,15 +1840,27 @@ bnx2_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
return IRQ_HANDLED;
}
static inline int
bnx2_has_work(struct bnx2 *bp)
{
struct status_block *sblk = bp->status_blk;
if ((sblk->status_rx_quick_consumer_index0 != bp->hw_rx_cons) ||
(sblk->status_tx_quick_consumer_index0 != bp->hw_tx_cons))
return 1;
if (((sblk->status_attn_bits & STATUS_ATTN_BITS_LINK_STATE) != 0) !=
bp->link_up)
return 1;
return 0;
}
static int
bnx2_poll(struct net_device *dev, int *budget)
{
struct bnx2 *bp = dev->priv;
int rx_done = 1;
bp->last_status_idx = bp->status_blk->status_idx;
rmb();
if ((bp->status_blk->status_attn_bits &
STATUS_ATTN_BITS_LINK_STATE) !=
(bp->status_blk->status_attn_bits_ack &
@ -1846,11 +1871,10 @@ bnx2_poll(struct net_device *dev, int *budget)
spin_unlock(&bp->phy_lock);
}
if (bp->status_blk->status_tx_quick_consumer_index0 != bp->tx_cons) {
if (bp->status_blk->status_tx_quick_consumer_index0 != bp->hw_tx_cons)
bnx2_tx_int(bp);
}
if (bp->status_blk->status_rx_quick_consumer_index0 != bp->rx_cons) {
if (bp->status_blk->status_rx_quick_consumer_index0 != bp->hw_rx_cons) {
int orig_budget = *budget;
int work_done;
@ -1860,13 +1884,12 @@ bnx2_poll(struct net_device *dev, int *budget)
work_done = bnx2_rx_int(bp, orig_budget);
*budget -= work_done;
dev->quota -= work_done;
if (work_done >= orig_budget) {
rx_done = 0;
}
}
if (rx_done) {
bp->last_status_idx = bp->status_blk->status_idx;
rmb();
if (!bnx2_has_work(bp)) {
netif_rx_complete(dev);
REG_WR(bp, BNX2_PCICFG_INT_ACK_CMD,
BNX2_PCICFG_INT_ACK_CMD_INDEX_VALID |
@ -3222,6 +3245,7 @@ bnx2_init_tx_ring(struct bnx2 *bp)
bp->tx_prod = 0;
bp->tx_cons = 0;
bp->hw_tx_cons = 0;
bp->tx_prod_bseq = 0;
val = BNX2_L2CTX_TYPE_TYPE_L2;
@ -3254,6 +3278,7 @@ bnx2_init_rx_ring(struct bnx2 *bp)
ring_prod = prod = bp->rx_prod = 0;
bp->rx_cons = 0;
bp->hw_rx_cons = 0;
bp->rx_prod_bseq = 0;
rxbd = &bp->rx_desc_ring[0];

3
drivers/net/bnx2.h
View File

@ -3914,6 +3914,9 @@ struct bnx2 {
u16 tx_cons;
int tx_ring_size;
u16 hw_tx_cons;
u16 hw_rx_cons;
#ifdef BCM_VLAN
struct vlan_group *vlgrp;
#endif