102 lines
2.9 KiB
Diff
102 lines
2.9 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 an error occurs, free the
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buffer and allocate a new one. If allocation or mapping fails, retry as
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long as there is NAPI poll budget left (count every attempt instead of
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every frame).
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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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@@ -404,51 +404,33 @@ static int bgmac_dma_rx_read(struct bgma
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void *buf = slot->buf;
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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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-
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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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+ if (++handled >= weight - 1) /* Should never be greater */
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+ break;
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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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+ if (!slot->dma_addr)
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+ break;
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+
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+ /* Unmap buffer to make it accessible to the CPU */
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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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+ slot->dma_addr = 0;
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+
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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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/* 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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+ kfree(buf);
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break;
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}
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/* Omit CRC. */
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len -= ETH_FCS_LEN;
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- /* Prepare new skb as replacement */
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- err = bgmac_dma_rx_skb_for_slot(bgmac, slot);
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- if (err) {
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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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-
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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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BGMAC_RX_BUF_OFFSET + len);
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@@ -458,14 +440,16 @@ static int bgmac_dma_rx_read(struct bgma
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skb_checksum_none_assert(skb);
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skb->protocol = eth_type_trans(skb, bgmac->net_dev);
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napi_gro_receive(&bgmac->napi, skb);
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- handled++;
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} while (0);
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+ /* Prepare new skb as replacement */
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+ if (bgmac_dma_rx_skb_for_slot(bgmac, slot))
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+ continue;
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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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if (++ring->start >= BGMAC_RX_RING_SLOTS)
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ring->start = 0;
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-
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- if (handled >= weight) /* Should never be greater */
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- break;
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}
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return handled;
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