ixgb: leave room for extra hardware memory usage (a3dc3da0) · Commits · 戴 / test

ixgb hardware (not ixgbe) has a problem where it might dma past the end of a buffer in certain cases. leave 8 bytes extra room. Signed-off-by:

drivers/net/ixgb/ixgb_main.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -560,7 +560,7 @@ ixgb_sw_init(struct ixgb_adapter *adapter)
		hw->subsystem_id = pdev->subsystem_device;

		hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
		adapter->rx_buffer_len = hw->max_frame_size;
		adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */

		if((hw->device_id == IXGB_DEVICE_ID_82597EX)
		\|\| (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
		@@ -1573,7 +1573,7 @@ ixgb_change_mtu(struct net_device *netdev, int new_mtu)
		return -EINVAL;
		}

		adapter->rx_buffer_len = max_frame;
		adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */

		netdev->mtu = new_mtu;