cxgb3: FIx VLAN over Jumbo frames
The mac is expected to auto-inflate the Maximum Frame size for VLAN tagged frames. It however does not work with jumbo frames. Work around the bug adding 4 to the Maximum Frame for MTUs greater than 1536. Signed-off-by: Divy Le Ray <divy@chelsio.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -353,6 +353,9 @@ int t3_mac_set_mtu(struct cmac *mac, unsigned int mtu)
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* packet size register includes header, but not FCS.
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*/
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mtu += 14;
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if (mtu > 1536)
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mtu += 4;
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if (mtu > MAX_FRAME_SIZE - 4)
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return -EINVAL;
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t3_write_reg(adap, A_XGM_RX_MAX_PKT_SIZE + mac->offset, mtu);
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