Thanks Bruce so much! That perfectly solves my problem. Tim
At 2015-05-25 18:28:48, "Bruce Richardson" <bruce.richardson at intel.com> wrote: >On Mon, May 25, 2015 at 06:15:23PM +0800, Tim Deng wrote: >> 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 >> >Check that you have not got TX offloads disabled in your port configuration. If >you pass in NULL for the rte_eth_txconf pointer on tx queue setup, then >offloads >will be disabled. To get offloads such as checksums to work, you need to >explicitly >set the flags to allow them. (Generally, this means just setting txqflags to 0) > >Regards, >/Bruce >
