87 lines
2.5 KiB
Diff
87 lines
2.5 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Sun, 12 Apr 2015 10:08:04 +0200
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Subject: [PATCH] bgmac: leave interrupts disabled as long as there is work
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to do
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Always poll rx and tx during NAPI poll instead of relying on the status
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of the first interrupt. This prevents bgmac_poll from leaving unfinished
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work around until the next IRQ.
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In my tests this makes bridging/routing throughput under heavy load more
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stable and ensures that no new IRQs arrive as long as bgmac_poll uses up
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the entire budget.
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/drivers/net/ethernet/broadcom/bgmac.c
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+++ b/drivers/net/ethernet/broadcom/bgmac.c
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@@ -1109,8 +1109,6 @@ static void bgmac_chip_reset(struct bgma
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bgmac_phy_init(bgmac);
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netdev_reset_queue(bgmac->net_dev);
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-
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- bgmac->int_status = 0;
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}
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static void bgmac_chip_intrs_on(struct bgmac *bgmac)
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@@ -1225,14 +1223,13 @@ static irqreturn_t bgmac_interrupt(int i
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if (!int_status)
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return IRQ_NONE;
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- /* Ack */
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- bgmac_write(bgmac, BGMAC_INT_STATUS, int_status);
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+ int_status &= ~(BGMAC_IS_TX0 | BGMAC_IS_RX);
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+ if (int_status)
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+ bgmac_err(bgmac, "Unknown IRQs: 0x%08X\n", int_status);
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/* Disable new interrupts until handling existing ones */
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bgmac_chip_intrs_off(bgmac);
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- bgmac->int_status = int_status;
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-
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napi_schedule(&bgmac->napi);
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return IRQ_HANDLED;
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@@ -1241,25 +1238,17 @@ static irqreturn_t bgmac_interrupt(int i
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static int bgmac_poll(struct napi_struct *napi, int weight)
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{
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struct bgmac *bgmac = container_of(napi, struct bgmac, napi);
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- struct bgmac_dma_ring *ring;
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int handled = 0;
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- if (bgmac->int_status & BGMAC_IS_TX0) {
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- ring = &bgmac->tx_ring[0];
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- bgmac_dma_tx_free(bgmac, ring);
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- bgmac->int_status &= ~BGMAC_IS_TX0;
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- }
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+ /* Ack */
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+ bgmac_write(bgmac, BGMAC_INT_STATUS, ~0);
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- if (bgmac->int_status & BGMAC_IS_RX) {
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- ring = &bgmac->rx_ring[0];
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- handled += bgmac_dma_rx_read(bgmac, ring, weight);
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- bgmac->int_status &= ~BGMAC_IS_RX;
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- }
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+ bgmac_dma_tx_free(bgmac, &bgmac->tx_ring[0]);
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+ handled += bgmac_dma_rx_read(bgmac, &bgmac->rx_ring[0], weight);
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- if (bgmac->int_status) {
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- bgmac_err(bgmac, "Unknown IRQs: 0x%08X\n", bgmac->int_status);
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- bgmac->int_status = 0;
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- }
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+ /* Poll again if more events arrived in the meantime */
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+ if (bgmac_read(bgmac, BGMAC_INT_STATUS) & (BGMAC_IS_TX0 | BGMAC_IS_RX))
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+ return handled;
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if (handled < weight) {
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napi_complete(napi);
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--- a/drivers/net/ethernet/broadcom/bgmac.h
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+++ b/drivers/net/ethernet/broadcom/bgmac.h
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@@ -452,7 +452,6 @@ struct bgmac {
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/* Int */
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u32 int_mask;
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- u32 int_status;
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/* Current MAC state */
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int mac_speed;
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