68 lines
2 KiB
Diff
68 lines
2 KiB
Diff
From: Felix Fietkau <nbd@openwrt.org>
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Date: Sun, 12 Apr 2015 22:23:07 +0200
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Subject: [PATCH] bgmac: simplify rx DMA error handling
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Unmap the DMA buffer before checking it. If it is poisoned, map it again
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and pass it back to the hardware.
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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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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@@ -405,25 +405,20 @@ static int bgmac_dma_rx_read(struct bgma
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u16 len, flags;
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/* Unmap buffer to make it accessible to the CPU */
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- dma_sync_single_for_cpu(dma_dev, slot->dma_addr,
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- BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
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+ dma_unmap_single(dma_dev, slot->dma_addr,
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+ BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
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/* Get info from the header */
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len = le16_to_cpu(rx->len);
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flags = le16_to_cpu(rx->flags);
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do {
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- dma_addr_t old_dma_addr = slot->dma_addr;
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int err;
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/* Check for poison and drop or pass the packet */
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if (len == 0xdead && flags == 0xbeef) {
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bgmac_err(bgmac, "Found poisoned packet at slot %d, DMA issue!\n",
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ring->start);
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- dma_sync_single_for_device(dma_dev,
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- slot->dma_addr,
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- BGMAC_RX_BUF_SIZE,
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- DMA_FROM_DEVICE);
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break;
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}
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@@ -436,18 +431,8 @@ static int bgmac_dma_rx_read(struct bgma
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/* Poison the old skb */
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rx->len = cpu_to_le16(0xdead);
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rx->flags = cpu_to_le16(0xbeef);
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-
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- dma_sync_single_for_device(dma_dev,
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- slot->dma_addr,
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- BGMAC_RX_BUF_SIZE,
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- DMA_FROM_DEVICE);
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break;
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}
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- bgmac_dma_rx_setup_desc(bgmac, ring, ring->start);
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-
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- /* Unmap old skb, we'll pass it to the netfif */
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- dma_unmap_single(dma_dev, old_dma_addr,
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- BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
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skb = build_skb(buf, BGMAC_RX_ALLOC_SIZE);
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skb_put(skb, BGMAC_RX_FRAME_OFFSET +
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@@ -461,6 +446,8 @@ static int bgmac_dma_rx_read(struct bgma
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handled++;
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} while (0);
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+ bgmac_dma_rx_setup_desc(bgmac, ring, ring->start);
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+
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if (++ring->start >= BGMAC_RX_RING_SLOTS)
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ring->start = 0;
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