From 2a49128f0a6edee337174ea341c1d6d7565be350 Mon Sep 17 00:00:00 2001 From: Jay Cliburn Date: Mon, 14 Jan 2008 19:56:41 -0600 Subject: [PATCH] atl1: fix frame length bug The driver sets up the hardware to accept a frame with max length equal to MTU + Ethernet header + FCS + VLAN tag, but we neglect to add the VLAN tag size to the ingress buffer. When a VLAN-tagged frame arrives, the hardware passes it, but bad things happen because the buffer is too small. This patch fixes that. Thanks to David Harris for reporting the bug and testing the fix. Tested-by: David Harris Signed-off-by: Jay Cliburn Signed-off-by: Jeff Garzik --- drivers/net/atl1/atl1_main.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/atl1/atl1_main.c b/drivers/net/atl1/atl1_main.c index 35b0a7dd4e..9200ee59d8 100644 --- a/drivers/net/atl1/atl1_main.c +++ b/drivers/net/atl1/atl1_main.c @@ -120,7 +120,7 @@ static int __devinit atl1_sw_init(struct atl1_adapter *adapter) struct atl1_hw *hw = &adapter->hw; struct net_device *netdev = adapter->netdev; - hw->max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN; + hw->max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN; hw->min_frame_size = ETH_ZLEN + ETH_FCS_LEN; adapter->wol = 0; @@ -688,7 +688,7 @@ static int atl1_change_mtu(struct net_device *netdev, int new_mtu) { struct atl1_adapter *adapter = netdev_priv(netdev); int old_mtu = netdev->mtu; - int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN; + int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN; if ((max_frame < ETH_ZLEN + ETH_FCS_LEN) || (max_frame > MAX_JUMBO_FRAME_SIZE)) { @@ -853,8 +853,8 @@ static u32 atl1_configure(struct atl1_adapter *adapter) /* set Interrupt Clear Timer */ iowrite16(adapter->ict, hw->hw_addr + REG_CMBDISDMA_TIMER); - /* set MTU, 4 : VLAN */ - iowrite32(hw->max_frame_size + 4, hw->hw_addr + REG_MTU); + /* set max frame size hw will accept */ + iowrite32(hw->max_frame_size, hw->hw_addr + REG_MTU); /* jumbo size & rrd retirement timer */ value = (((u32) hw->rx_jumbo_th & RXQ_JMBOSZ_TH_MASK) -- 2.39.5