ar71xx: ag71xx: add ag71xx_max_frame_len() helper
Signed-off-by: Gabor Juhos <juhosg@openwrt.org> SVN-Revision: 39146
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1 changed files with 8 additions and 2 deletions
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@ -28,6 +28,11 @@ static int ag71xx_msg_level = -1;
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module_param_named(msg_level, ag71xx_msg_level, int, 0);
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MODULE_PARM_DESC(msg_level, "Message level (-1=defaults,0=none,...,16=all)");
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static inline unsigned int ag71xx_max_frame_len(unsigned int mtu)
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{
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return ETH_HLEN + VLAN_HLEN + mtu + ETH_FCS_LEN;
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}
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static void ag71xx_dump_dma_regs(struct ag71xx *ag)
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{
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DBG("%s: dma_tx_ctrl=%08x, dma_tx_desc=%08x, dma_tx_status=%08x\n",
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@ -1052,9 +1057,10 @@ static void ag71xx_netpoll(struct net_device *dev)
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static int ag71xx_change_mtu(struct net_device *dev, int new_mtu)
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{
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struct ag71xx *ag = netdev_priv(dev);
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unsigned int max_frame_len;
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if (new_mtu < 68 ||
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new_mtu > ag->max_frame_len - ETH_HLEN - ETH_FCS_LEN)
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max_frame_len = ag71xx_max_frame_len(new_mtu);
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if (new_mtu < 68 || max_frame_len > ag->max_frame_len)
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return -EINVAL;
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dev->mtu = new_mtu;
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