diff options
Diffstat (limited to 'target/linux/generic/patches-3.18/077-07-bgmac-simplify-rx-DMA-error-handling.patch')
| -rw-r--r-- | target/linux/generic/patches-3.18/077-07-bgmac-simplify-rx-DMA-error-handling.patch | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.18/077-07-bgmac-simplify-rx-DMA-error-handling.patch b/target/linux/generic/patches-3.18/077-07-bgmac-simplify-rx-DMA-error-handling.patch new file mode 100644 index 0000000000..f26e42c20d --- /dev/null +++ b/target/linux/generic/patches-3.18/077-07-bgmac-simplify-rx-DMA-error-handling.patch @@ -0,0 +1,68 @@ +From: Felix Fietkau <nbd@openwrt.org> +Date: Sun, 12 Apr 2015 22:23:07 +0200 +Subject: [PATCH] bgmac: simplify rx DMA error handling + +Unmap the DMA buffer before checking it. If it is poisoned, map it again +and pass it back to the hardware. + +Signed-off-by: Felix Fietkau <nbd@openwrt.org> +--- + +--- a/drivers/net/ethernet/broadcom/bgmac.c ++++ b/drivers/net/ethernet/broadcom/bgmac.c +@@ -405,25 +405,20 @@ static int bgmac_dma_rx_read(struct bgma + u16 len, flags; + + /* Unmap buffer to make it accessible to the CPU */ +- dma_sync_single_for_cpu(dma_dev, slot->dma_addr, +- BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE); ++ dma_unmap_single(dma_dev, slot->dma_addr, ++ BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE); + + /* Get info from the header */ + len = le16_to_cpu(rx->len); + flags = le16_to_cpu(rx->flags); + + do { +- dma_addr_t old_dma_addr = slot->dma_addr; + int err; + + /* Check for poison and drop or pass the packet */ + if (len == 0xdead && flags == 0xbeef) { + bgmac_err(bgmac, "Found poisoned packet at slot %d, DMA issue!\n", + ring->start); +- dma_sync_single_for_device(dma_dev, +- slot->dma_addr, +- BGMAC_RX_BUF_SIZE, +- DMA_FROM_DEVICE); + break; + } + +@@ -436,18 +431,8 @@ static int bgmac_dma_rx_read(struct bgma + /* Poison the old skb */ + rx->len = cpu_to_le16(0xdead); + rx->flags = cpu_to_le16(0xbeef); +- +- dma_sync_single_for_device(dma_dev, +- slot->dma_addr, +- BGMAC_RX_BUF_SIZE, +- DMA_FROM_DEVICE); + break; + } +- bgmac_dma_rx_setup_desc(bgmac, ring, ring->start); +- +- /* Unmap old skb, we'll pass it to the netfif */ +- dma_unmap_single(dma_dev, old_dma_addr, +- BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE); + + skb = build_skb(buf, BGMAC_RX_ALLOC_SIZE); + skb_put(skb, BGMAC_RX_FRAME_OFFSET + +@@ -461,6 +446,8 @@ static int bgmac_dma_rx_read(struct bgma + handled++; + } while (0); + ++ bgmac_dma_rx_setup_desc(bgmac, ring, ring->start); ++ + if (++ring->start >= BGMAC_RX_RING_SLOTS) + ring->start = 0; + |