From 57bf6eef2f43ae810504753208b3a2c0bb2e4765 Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Thu, 13 May 2010 15:26:17 +0000 Subject: ixgb and e1000: Use new function for copybreak tests There appears to be an off-by-1 defect in the maximum packet size copied when copybreak is speified in these modules. The copybreak module params are specified as: "Maximum size of packet that is copied to a new buffer on receive" The tests are changed from "< copybreak" to "<= copybreak" and moved into new static functions for readability. Signed-off-by: Joe Perches Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- drivers/net/e1000/e1000_main.c | 47 ++++++++++++++++++++++++------------------ 1 file changed, 27 insertions(+), 20 deletions(-) (limited to 'drivers/net/e1000/e1000_main.c') diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c index 5de738a6d0e6..ebdea0891665 100644 --- a/drivers/net/e1000/e1000_main.c +++ b/drivers/net/e1000/e1000_main.c @@ -3785,6 +3785,31 @@ next_desc: return cleaned; } +/* + * this should improve performance for small packets with large amounts + * of reassembly being done in the stack + */ +static void e1000_check_copybreak(struct net_device *netdev, + struct e1000_buffer *buffer_info, + u32 length, struct sk_buff **skb) +{ + struct sk_buff *new_skb; + + if (length > copybreak) + return; + + new_skb = netdev_alloc_skb_ip_align(netdev, length); + if (!new_skb) + return; + + skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN, + (*skb)->data - NET_IP_ALIGN, + length + NET_IP_ALIGN); + /* save the skb in buffer_info as good */ + buffer_info->skb = *skb; + *skb = new_skb; +} + /** * e1000_clean_rx_irq - Send received data up the network stack; legacy * @adapter: board private structure @@ -3883,26 +3908,8 @@ static bool e1000_clean_rx_irq(struct e1000_adapter *adapter, total_rx_bytes += length; total_rx_packets++; - /* code added for copybreak, this should improve - * performance for small packets with large amounts - * of reassembly being done in the stack */ - if (length < copybreak) { - struct sk_buff *new_skb = - netdev_alloc_skb_ip_align(netdev, length); - if (new_skb) { - skb_copy_to_linear_data_offset(new_skb, - -NET_IP_ALIGN, - (skb->data - - NET_IP_ALIGN), - (length + - NET_IP_ALIGN)); - /* save the skb in buffer_info as good */ - buffer_info->skb = skb; - skb = new_skb; - } - /* else just continue with the old one */ - } - /* end copybreak code */ + e1000_check_copybreak(netdev, buffer_info, length, &skb); + skb_put(skb, length); /* Receive Checksum Offload */ -- cgit v1.2.3-58-ga151