[dpdk-stable] [PATCH v4 2/2] app/testpmd: fix txonly forwording

[Li, Xiaoyun]

> -----Original Message-----
> From: Zhang, AlvinX <alvinx.zhang at intel.com>
> Sent: Wednesday, September 22, 2021 10:50
> To: Li, Xiaoyun <xiaoyun.li at intel.com>; Ananyev, Konstantin
> <konstantin.ananyev at intel.com>
> Cc: dev at dpdk.org; Zhang, AlvinX <alvinx.zhang at intel.com>; stable at dpdk.org
> Subject: [PATCH v4 2/2] app/testpmd: fix txonly forwording
> 
> When random number of Tx segments is enabled, because the actual number of
> segments may be only one, the first segment of the Tx packets must
> accommodate a complete being sending Eth/IP/UDP packet.
> 
> Besides, if multiple flow is enabled, the forwarding will update the IP and UDP
> header, these headers shouldn't cross segments.
> This also requires the first Tx segment can accommodate a complete
> Eth/IP/UDP packet.
> 
> In addition, if time stamp is enabled, the forwarding needs more Tx segment
> space for time stamp information.
> 
> This patch adds checks in beginning of forward engine to make sure all above
> conditions are met.
> 
> Bugzilla ID: 797
> Fixes: 79bec05b32b7 ("app/testpmd: add ability to split outgoing packets")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Alvin Zhang <alvinx.zhang at intel.com>

Acked-by: Xiaoyun Li <xiaoyun.li at intel.com>