64f54741e3
This bgmac patch was an attempt to fix/workaround bug reported in https://dev.openwrt.org/ticket/7198 noticed on WNR3500L. Patch assumed length reported by the hardware was 0 and was trying to read it until getting a different value. This was actually the opposite. Lenghts were some invalid & huge values that resulted in skb_over_panic. For example: skbuff: skb_over_panic: text:83b21074 len:57222 (...) skbuff: skb_over_panic: text:87af1024 len:43226 (...) skbuff: skb_over_panic: text:87af5024 len:8739 (...) So instead of that not-working patch checking for 0, write a new one checking for huge values. In case something like that happens, dump hardware state and drop the packet. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> SVN-Revision: 40424
40 lines
1.9 KiB
Diff
40 lines
1.9 KiB
Diff
From 2d12a9abf3f81de5b51852e3cfcba8cedac82642 Mon Sep 17 00:00:00 2001
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From: Hauke Mehrtens <hauke@hauke-m.de>
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Date: Fri, 6 Dec 2013 01:14:52 +0100
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Subject: [PATCH] bgmac: check length of received frame
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---
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drivers/net/ethernet/broadcom/bgmac.c | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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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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@@ -363,6 +363,27 @@ static int bgmac_dma_rx_read(struct bgma
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dma_addr_t old_dma_addr = slot->dma_addr;
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int err;
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+ if (len > BGMAC_RX_MAX_FRAME_SIZE) {
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+ struct bgmac_dma_desc *dma_desc = ring->cpu_base + ring->start;
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+
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+ bgmac_err(bgmac, "Hardware reported invalid packet length %d for slot %d!\n", len, ring->start);
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+ bgmac_err(bgmac, "flags: 0x%04X\n", flags);
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+ bgmac_err(bgmac, "ctl0: 0x%08X\tctl1: 0x%08X\n", le32_to_cpu(dma_desc->ctl0), le32_to_cpu(dma_desc->ctl1));
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+
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+ bgmac_err(bgmac, " BGMAC_DMA_RX_CTL: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_CTL));
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+ bgmac_err(bgmac, " BGMAC_DMA_RX_INDEX: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_INDEX));
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+ bgmac_err(bgmac, "BGMAC_DMA_RX_RINGLO: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_RINGLO));
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+ bgmac_err(bgmac, "BGMAC_DMA_RX_RINGHI: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_RINGHI));
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+ bgmac_err(bgmac, "BGMAC_DMA_RX_STATUS: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_STATUS));
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+ bgmac_err(bgmac, " BGMAC_DMA_RX_ERROR: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_ERROR));
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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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+
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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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