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From: "Tim Deng" <dpdkdev@126.com>
To: "dev@dpdk.org" <dev@dpdk.org>
Subject: ixgbe tcp cksum offload
Date: Mon, 25 May 2015 18:15:23 +0800 (CST)	[thread overview]
Message-ID: <7b3bcfdc.ee97.14d8a91d9e4.Coremail.dpdkdev@126.com> (raw)

Hi,


I am trying to use ixgbe tcp cksum h/w offload by following steps:
- populate pseudo cksum
- set l2_len, l3_len, l4_len
- set ol_flags


But I found the pkt doesn't get right h/w checksum by sniffing on recv side, and TCP cksum still leave with the original pseudo cksum. 
And I verified those meta are correctly set, e.g. a TCP syn pkt:
l2_len = 14, l3_len = 20, l4_len = 40 (with some tcp options),
and ol_flags = 0x90000000000000 which means PKT_TX_IPV4 | PKT_TX_TCP_CKSUM


Did I miss any step?


Thanks in advance,
Tim


             reply	other threads:[~2015-05-25 10:15 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-25 10:15 Tim Deng [this message]
2015-05-25 10:28 ` ixgbe tcp cksum offload Bruce Richardson
2015-05-25 10:50   ` Tim Deng

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