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ar71xx: ag71xx: add ag71xx_max_frame_len() helper

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Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39146 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
Gabor Juhos 2013-12-20 11:41:18 +00:00
parent c52c793ce1
commit 60f7a8a357
1 changed files with 8 additions and 2 deletions
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10
target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
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@ -28,6 +28,11 @@ static int ag71xx_msg_level = -1;
module_param_named(msg_level, ag71xx_msg_level, int, 0);
MODULE_PARM_DESC(msg_level, "Message level (-1=defaults,0=none,...,16=all)");
static inline unsigned int ag71xx_max_frame_len(unsigned int mtu)
{
return ETH_HLEN + VLAN_HLEN + mtu + ETH_FCS_LEN;
}
static void ag71xx_dump_dma_regs(struct ag71xx *ag)
{
DBG("%s: dma_tx_ctrl=%08x, dma_tx_desc=%08x, dma_tx_status=%08x\n",
@ -1052,9 +1057,10 @@ static void ag71xx_netpoll(struct net_device *dev)
static int ag71xx_change_mtu(struct net_device *dev, int new_mtu)
{
struct ag71xx *ag = netdev_priv(dev);
unsigned int max_frame_len;
if (new_mtu < 68 ||
new_mtu > ag->max_frame_len - ETH_HLEN - ETH_FCS_LEN)
max_frame_len = ag71xx_max_frame_len(new_mtu);
if (new_mtu < 68 || max_frame_len > ag->max_frame_len)
return -EINVAL;
dev->mtu = new_mtu;