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[PATCH] sky2: fix NAPI and receive handling 

Speed up the receive and interrupt processing and eliminate a
couple of race conditions from NAPI code.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
shemminger@osdl.org 2005-10-26 12:16:10 -07:00 committed by Jeff Garzik
parent d571b694df
commit bea8610331
1 changed files with 30 additions and 33 deletions
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63
drivers/net/sky2.c
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@ -76,7 +76,7 @@
#define RX_LE_SIZE 256
#define RX_LE_BYTES (RX_LE_SIZE*sizeof(struct sky2_rx_le))
#define RX_MAX_PENDING (RX_LE_SIZE/2 - 1)
#define RX_MAX_PENDING (RX_LE_SIZE/2 - 2)
#define RX_DEF_PENDING 128
#define RX_COPY_THRESHOLD 256
@ -690,7 +690,7 @@ static inline void sky2_put_idx(struct sky2_hw *hw, unsigned q,
setnew:
sky2_write16(hw, Y2_QADDR(q, PREF_UNIT_PUT_IDX), idx);
}
*last = sky2_read16(hw, Y2_QADDR(q, PREF_UNIT_PUT_IDX));
*last = idx;
}
@ -723,15 +723,6 @@ static inline void sky2_rx_add(struct sky2_port *sky2, struct ring_info *re)
le->opcode = OP_PACKET | HW_OWNER;
}
/* Tell receiver about new buffers. */
static inline void rx_set_put(struct net_device *dev)
{
struct sky2_port *sky2 = netdev_priv(dev);
if (sky2->rx_last_put != sky2->rx_put)
sky2_put_idx(sky2->hw, rxqaddr[sky2->port], sky2->rx_put,
&sky2->rx_last_put, RX_LE_SIZE);
}
/* Tell chip where to start receive checksum.
* Actually has two checksums, but set both same to avoid possible byte
@ -1616,6 +1607,10 @@ resubmit:
re->skb->ip_summed = CHECKSUM_NONE;
sky2_rx_add(sky2, re);
/* Tell receiver about new buffers. */
sky2_put_idx(sky2->hw, rxqaddr[sky2->port], sky2->rx_put,
&sky2->rx_last_put, RX_LE_SIZE);
return skb;
error:
@ -1664,16 +1659,26 @@ static int sky2_poll(struct net_device *dev0, int *budget)
hwidx = sky2_read16(hw, STAT_PUT_IDX);
BUG_ON(hwidx >= STATUS_RING_SIZE);
rmb();
while (hw->st_idx != hwidx && work_done < to_do) {
do {
struct sky2_status_le *le = hw->st_le + hw->st_idx;
struct sky2_port *sky2;
struct sk_buff *skb;
u32 status;
u16 length;
BUG_ON(le->link >= hw->ports);
if (!hw->dev[le->link])
goto skip;
/* Are we done yet? */
if (hw->st_idx == hwidx) {
sky2_write32(hw, STAT_CTRL, SC_STAT_CLR_IRQ);
hwidx = sky2_read16(hw, STAT_PUT_IDX);
if (hwidx == hw->st_idx)
break;
}
hw->st_idx = (hw->st_idx + 1) % STATUS_RING_SIZE;
prefetch(&hw->st_le[hw->st_idx]);
BUG_ON(le->link >= hw->ports || !hw->dev[le->link]);
sky2 = netdev_priv(hw->dev[le->link]);
status = le32_to_cpu(le->status);
@ -1692,6 +1697,7 @@ static int sky2_poll(struct net_device *dev0, int *budget)
} else
#endif
netif_receive_skb(skb);
++work_done;
break;
#ifdef SKY2_VLAN_TAG_USED
@ -1722,22 +1728,11 @@ static int sky2_poll(struct net_device *dev0, int *budget)
break;
}
skip:
hw->st_idx = (hw->st_idx + 1) % STATUS_RING_SIZE;
if (hw->st_idx == hwidx) {
hwidx = sky2_read16(hw, STAT_PUT_IDX);
rmb();
}
}
le->opcode = 0; /* paranoia */
} while (work_done < to_do);
mmiowb();
if (hw->dev[0])
rx_set_put(hw->dev[0]);
if (hw->dev[1])
rx_set_put(hw->dev[1]);
*budget -= work_done;
dev0->quota -= work_done;
if (work_done < to_do) {
@ -1750,10 +1745,10 @@ static int sky2_poll(struct net_device *dev0, int *budget)
sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_START);
}
netif_rx_complete(dev0);
hw->intr_mask |= Y2_IS_STAT_BMU;
sky2_write32(hw, B0_IMSK, hw->intr_mask);
sky2_read32(hw, B0_IMSK);
netif_rx_complete(dev0);
}
return work_done >= to_do;
@ -1880,6 +1875,7 @@ static void sky2_phy_intr(struct sky2_hw *hw, unsigned port)
static irqreturn_t sky2_intr(int irq, void *dev_id, struct pt_regs *regs)
{
struct sky2_hw *hw = dev_id;
struct net_device *dev0 = hw->dev[0];
u32 status;
status = sky2_read32(hw, B0_Y2_SP_ISRC2);
@ -1890,12 +1886,13 @@ static irqreturn_t sky2_intr(int irq, void *dev_id, struct pt_regs *regs)
sky2_hw_intr(hw);
/* Do NAPI for Rx and Tx status */
if ((status & Y2_IS_STAT_BMU) && netif_rx_schedule_test(hw->dev[0])) {
sky2_write32(hw, STAT_CTRL, SC_STAT_CLR_IRQ);
if (status & Y2_IS_STAT_BMU) {
hw->intr_mask &= ~Y2_IS_STAT_BMU;
sky2_write32(hw, B0_IMSK, hw->intr_mask);
__netif_rx_schedule(hw->dev[0]);
prefetch(&hw->st_le[hw->st_idx]);
if (netif_rx_schedule_test(dev0))
__netif_rx_schedule(dev0);
}
if (status & Y2_IS_IRQ_PHY1)