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bgmac: leave interrupts disabled as long as there is work to do

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Always poll rx and tx during NAPI poll instead of relying on the status
of the first interrupt. This prevents bgmac_poll from leaving unfinished
work around until the next IRQ.
In my tests this makes bridging/routing throughput under heavy load more
stable and ensures that no new IRQs arrive as long as bgmac_poll uses up
the entire budget.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Felix Fietkau 2015-04-14 12:07:55 +02:00 committed by David S. Miller
parent b38c83dd08
commit eb64e2923a
2 changed files with 10 additions and 22 deletions
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31
drivers/net/ethernet/broadcom/bgmac.c
View File

@ -1109,8 +1109,6 @@ static void bgmac_chip_reset(struct bgmac *bgmac)
bgmac_phy_init(bgmac);
netdev_reset_queue(bgmac->net_dev);
bgmac->int_status = 0;
}
static void bgmac_chip_intrs_on(struct bgmac *bgmac)
@ -1225,14 +1223,13 @@ static irqreturn_t bgmac_interrupt(int irq, void *dev_id)
if (!int_status)
return IRQ_NONE;
/* Ack */
bgmac_write(bgmac, BGMAC_INT_STATUS, int_status);
int_status &= ~(BGMAC_IS_TX0 | BGMAC_IS_RX);
if (int_status)
bgmac_err(bgmac, "Unknown IRQs: 0x%08X\n", int_status);
/* Disable new interrupts until handling existing ones */
bgmac_chip_intrs_off(bgmac);
bgmac->int_status = int_status;
napi_schedule(&bgmac->napi);
return IRQ_HANDLED;
@ -1241,25 +1238,17 @@ static irqreturn_t bgmac_interrupt(int irq, void *dev_id)
static int bgmac_poll(struct napi_struct *napi, int weight)
{
struct bgmac *bgmac = container_of(napi, struct bgmac, napi);
struct bgmac_dma_ring *ring;
int handled = 0;
if (bgmac->int_status & BGMAC_IS_TX0) {
ring = &bgmac->tx_ring[0];
bgmac_dma_tx_free(bgmac, ring);
bgmac->int_status &= ~BGMAC_IS_TX0;
}
/* Ack */
bgmac_write(bgmac, BGMAC_INT_STATUS, ~0);
if (bgmac->int_status & BGMAC_IS_RX) {
ring = &bgmac->rx_ring[0];
handled += bgmac_dma_rx_read(bgmac, ring, weight);
bgmac->int_status &= ~BGMAC_IS_RX;
}
bgmac_dma_tx_free(bgmac, &bgmac->tx_ring[0]);
handled += bgmac_dma_rx_read(bgmac, &bgmac->rx_ring[0], weight);
if (bgmac->int_status) {
bgmac_err(bgmac, "Unknown IRQs: 0x%08X\n", bgmac->int_status);
bgmac->int_status = 0;
}
/* Poll again if more events arrived in the meantime */
if (bgmac_read(bgmac, BGMAC_INT_STATUS) & (BGMAC_IS_TX0 | BGMAC_IS_RX))
return handled;
if (handled < weight) {
napi_complete(napi);

1
drivers/net/ethernet/broadcom/bgmac.h
View File

@ -452,7 +452,6 @@ struct bgmac {
/* Int */
u32 int_mask;
u32 int_status;
/* Current MAC state */
int mac_speed;