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authorAlexander Duyck <alexander.h.duyck@intel.com>2009-01-31 00:52:57 -0800
committerDavid S. Miller <davem@davemloft.net>2009-01-31 00:52:57 -0800
commitec54d7d6e40b04c16dfce0e41e506198a20c8645 (patch)
tree7e70f20258f0f3ac35e48e0d4a1fa41d63853997 /drivers/net
parentbbd98fe48a43464b4a044bc4cbeefad284d6aa80 (diff)
igb: prevent skb_over panic w/ mtu smaller than 1K
A panic has been observed with frame sizes smaller than 1K. This has been root caused to the hardware spanning larger frames across multiple buffers and then reporting the original frame size in the first descriptor. To prevent this we can enable set the LPE bit which in turn will restrict packet sizes to those set in the RLPML register. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/igb/igb_main.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index cc94412ddf8..a50db5398fa 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -1834,11 +1834,11 @@ static void igb_setup_rctl(struct igb_adapter *adapter)
rctl |= E1000_RCTL_SECRC;
/*
- * disable store bad packets, long packet enable, and clear size bits.
+ * disable store bad packets and clear size bits.
*/
- rctl &= ~(E1000_RCTL_SBP | E1000_RCTL_LPE | E1000_RCTL_SZ_256);
+ rctl &= ~(E1000_RCTL_SBP | E1000_RCTL_SZ_256);
- if (adapter->netdev->mtu > ETH_DATA_LEN)
+ /* enable LPE when to prevent packets larger than max_frame_size */
rctl |= E1000_RCTL_LPE;
/* Setup buffer sizes */
@@ -1864,7 +1864,7 @@ static void igb_setup_rctl(struct igb_adapter *adapter)
*/
/* allocations using alloc_page take too long for regular MTU
* so only enable packet split for jumbo frames */
- if (rctl & E1000_RCTL_LPE) {
+ if (adapter->netdev->mtu > ETH_DATA_LEN) {
adapter->rx_ps_hdr_size = IGB_RXBUFFER_128;
srrctl |= adapter->rx_ps_hdr_size <<
E1000_SRRCTL_BSIZEHDRSIZE_SHIFT;