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Date: Sun, 12 Apr 2015 12:08:10 +0200 From: Felix Fietkau <nbd@...nwrt.org> To: netdev@...r.kernel.org Cc: zajec5@...il.com, hauke@...ke-m.de Subject: [PATCH 2/4] bgmac: leave interrupts disabled as long as there is work to do 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@...nwrt.org> --- drivers/net/ethernet/broadcom/bgmac.c | 31 ++++++++++--------------------- drivers/net/ethernet/broadcom/bgmac.h | 1 - 2 files changed, 10 insertions(+), 22 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c index 73374b4..66876c5 100644 --- a/drivers/net/ethernet/broadcom/bgmac.c +++ b/drivers/net/ethernet/broadcom/bgmac.c @@ -1105,8 +1105,6 @@ 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) @@ -1221,14 +1219,13 @@ 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; @@ -1237,25 +1234,17 @@ 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 mean time */ + if (bgmac_read(bgmac, BGMAC_INT_STATUS) & (BGMAC_IS_TX0 | BGMAC_IS_RX)) + return handled; if (handled < weight) { napi_complete(napi); diff --git a/drivers/net/ethernet/broadcom/bgmac.h b/drivers/net/ethernet/broadcom/bgmac.h index 5a198d5..abd50d1 100644 --- a/drivers/net/ethernet/broadcom/bgmac.h +++ b/drivers/net/ethernet/broadcom/bgmac.h @@ -452,7 +452,6 @@ struct bgmac { /* Int */ u32 int_mask; - u32 int_status; /* Current MAC state */ int mac_speed; -- 2.2.2 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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