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authorHauke Mehrtens <hauke@hauke-m.de>2014-04-08 19:50:17 +0000
committerHauke Mehrtens <hauke@hauke-m.de>2014-04-08 19:50:17 +0000
commit64f54741e3912a4cd8c57a47c100273ad995931b (patch)
treee9eb66be132a65811639674ef021e9237952cfc0 /target/linux/generic/patches-3.12
parent4abcae7a1cd1092e8fd3ef5aee4c97108917a4ad (diff)
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kernel: bgmac: rework patch checking packet length
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
Diffstat (limited to 'target/linux/generic/patches-3.12')
-rw-r--r--target/linux/generic/patches-3.12/775-bgmac-check-length-of-received-frame.patch39
1 files changed, 39 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.12/775-bgmac-check-length-of-received-frame.patch b/target/linux/generic/patches-3.12/775-bgmac-check-length-of-received-frame.patch
new file mode 100644
index 0000000..c3d63b6
--- /dev/null
+++ b/target/linux/generic/patches-3.12/775-bgmac-check-length-of-received-frame.patch
@@ -0,0 +1,39 @@
+From 2d12a9abf3f81de5b51852e3cfcba8cedac82642 Mon Sep 17 00:00:00 2001
+From: Hauke Mehrtens <hauke@hauke-m.de>
+Date: Fri, 6 Dec 2013 01:14:52 +0100
+Subject: [PATCH] bgmac: check length of received frame
+
+---
+ drivers/net/ethernet/broadcom/bgmac.c | 9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+--- a/drivers/net/ethernet/broadcom/bgmac.c
++++ b/drivers/net/ethernet/broadcom/bgmac.c
+@@ -363,6 +363,27 @@ static int bgmac_dma_rx_read(struct bgma
+ dma_addr_t old_dma_addr = slot->dma_addr;
+ int err;
+
++ if (len > BGMAC_RX_MAX_FRAME_SIZE) {
++ struct bgmac_dma_desc *dma_desc = ring->cpu_base + ring->start;
++
++ bgmac_err(bgmac, "Hardware reported invalid packet length %d for slot %d!\n", len, ring->start);
++ bgmac_err(bgmac, "flags: 0x%04X\n", flags);
++ bgmac_err(bgmac, "ctl0: 0x%08X\tctl1: 0x%08X\n", le32_to_cpu(dma_desc->ctl0), le32_to_cpu(dma_desc->ctl1));
++
++ bgmac_err(bgmac, " BGMAC_DMA_RX_CTL: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_CTL));
++ bgmac_err(bgmac, " BGMAC_DMA_RX_INDEX: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_INDEX));
++ bgmac_err(bgmac, "BGMAC_DMA_RX_RINGLO: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_RINGLO));
++ bgmac_err(bgmac, "BGMAC_DMA_RX_RINGHI: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_RINGHI));
++ bgmac_err(bgmac, "BGMAC_DMA_RX_STATUS: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_STATUS));
++ bgmac_err(bgmac, " BGMAC_DMA_RX_ERROR: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_ERROR));
++
++ dma_sync_single_for_device(dma_dev,
++ slot->dma_addr,
++ BGMAC_RX_BUF_SIZE,
++ DMA_FROM_DEVICE);
++ break;
++ }
++
+ /* 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",