From: shemminger@osdl.org Date: Mon, 28 Aug 2006 17:00:50 +0000 (-0700) Subject: [PATCH] sky2: optimize checksum offload information X-Git-Tag: v2.6.19-rc1~1263^2~74 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1d179332f8918a5f4e031dc068a469283b01c4c1;p=karo-tx-linux.git [PATCH] sky2: optimize checksum offload information Since many packets have the same checksum starting offset and insertion location; the driver can save the last information and only tell hardware when it changes. Signed-off-by: Stephen Hemminger Signed-off-by: Jeff Garzik --- diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c index fe60f0462c97..eafb6327d68f 100644 --- a/drivers/net/sky2.c +++ b/drivers/net/sky2.c @@ -1280,12 +1280,17 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev) if (skb->nh.iph->protocol == IPPROTO_UDP) ctrl |= UDPTCP; - le = get_tx_le(sky2); - le->tx.csum.start = cpu_to_le16(hdr); - le->tx.csum.offset = cpu_to_le16(offset); - le->length = 0; /* initial checksum value */ - le->ctrl = 1; /* one packet */ - le->opcode = OP_TCPLISW | HW_OWNER; + if (hdr != sky2->tx_csum_start || offset != sky2->tx_csum_offset) { + sky2->tx_csum_start = hdr; + sky2->tx_csum_offset = offset; + + le = get_tx_le(sky2); + le->tx.csum.start = cpu_to_le16(hdr); + le->tx.csum.offset = cpu_to_le16(offset); + le->length = 0; /* initial checksum value */ + le->ctrl = 1; /* one packet */ + le->opcode = OP_TCPLISW | HW_OWNER; + } } le = get_tx_le(sky2); diff --git a/drivers/net/sky2.h b/drivers/net/sky2.h index bb92f694247f..fa8af9f503e4 100644 --- a/drivers/net/sky2.h +++ b/drivers/net/sky2.h @@ -1843,6 +1843,8 @@ struct sky2_port { u32 tx_addr64; u16 tx_pending; u16 tx_last_mss; + u16 tx_csum_start; + u16 tx_csum_offset; struct ring_info *rx_ring ____cacheline_aligned_in_smp; struct sky2_rx_le *rx_le;