Hi, Haiyue We will release the patch to support zero checksum in arm neon path later.
Best Regards Feifei > -----邮件原件----- > 发件人: Wang, Haiyue <haiyue.w...@intel.com> > 发送时间: 2021年2月2日 15:42 > 收件人: Feifei Wang <feifei.wa...@arm.com>; Ruifeng Wang > <ruifeng.w...@arm.com> > 抄送: Guo, Jia <jia....@intel.com>; Aaron Conole <acon...@redhat.com>; > dev@dpdk.org; Yang, Qiming <qiming.y...@intel.com>; Paolo Valerio > <pvale...@redhat.com> > 主题: RE: ixgbe and UDP with zero checksum > > + ARM experts, Feifei and Ruifeng. > > Need your further support for ARM NEON path. > > https://patchwork.dpdk.org/patch/87617/ > > > -----Original Message----- > > From: Paolo Valerio <pvale...@redhat.com> > > Sent: Friday, January 29, 2021 22:20 > > To: Wang, Haiyue <haiyue.w...@intel.com>; Yang, Qiming > > <qiming.y...@intel.com> > > Cc: Guo, Jia <jia....@intel.com>; Aaron Conole <acon...@redhat.com>; > > dev@dpdk.org > > Subject: RE: ixgbe and UDP with zero checksum > > > > "Wang, Haiyue" <haiyue.w...@intel.com> writes: > > > > > Hi Paolo, > > > > > >> -----Original Message----- > > >> From: Wang, Haiyue > > >> Sent: Friday, January 29, 2021 10:02 > > >> To: Paolo Valerio <pvale...@redhat.com> > > >> Cc: Guo, Jia <jia....@intel.com>; Aaron Conole > > >> <acon...@redhat.com>; dev@dpdk.org > > >> Subject: RE: ixgbe and UDP with zero checksum > > >> > > >> > -----Original Message----- > > >> > From: Paolo Valerio <pvale...@redhat.com> > > >> > Sent: Thursday, January 28, 2021 05:35 > > >> > To: Wang, Haiyue <haiyue.w...@intel.com> > > >> > Cc: Guo, Jia <jia....@intel.com>; Aaron Conole > > >> > <acon...@redhat.com>; dev@dpdk.org > > >> > Subject: RE: ixgbe and UDP with zero checksum > > >> > > > >> > "Wang, Haiyue" <haiyue.w...@intel.com> writes: > > >> > > > >> > > Hi Paolo, > > >> > > > > >> > >> -----Original Message----- > > >> > >> From: Paolo Valerio <pvale...@redhat.com> > > >> > >> Sent: Wednesday, January 27, 2021 21:50 > > >> > >> To: dev@dpdk.org > > >> > >> Cc: Guo, Jia <jia....@intel.com>; Wang, Haiyue > > >> > >> <haiyue.w...@intel.com>; Aaron Conole <acon...@redhat.com> > > >> > >> Subject: ixgbe and UDP with zero checksum > > >> > >> > > >> > >> Hi, > > >> > >> > > >> > >> performing some tests, I noticed that on ixgbe when receiving > > >> > >> UDP packets with zero checksum (no checksum) over IPv4, the > > >> > >> corresponding ol_flag for the l4 checksum is set to > PKT_RX_L4_CKSUM_BAD. > > >> > >> > > >> > >> In particular, this apparently has an impact on OvS using ct() > > >> > >> action where UDP packets with zero checksum are not tracked > because of that. > > >> > > > > >> > > > > >> > >> > > >> > >> [1] > > >> > >> > > >> > > > >> > > > https://patchwork.ozlabs.org/project/netdev/patch/20090724040031.30202 > > .1531.stgit@localhost.localdomai > > >> > >> n/ > > >> > > > > >> > > About 12 years old patch, it is hardware errata. For fixing > > >> > > this, have to always disable vector Rx path for 82599, it seems > > >> > > not a good idea to bring in this workaround. :( > > >> > > > > >> > > > >> > Thanks for the answer. > > >> > Yes, as I mentioned, the patch is old although still meaningful. > > >> > I linked it mostly because it mentions the hw errata. > > >> > > > >> > > >> What's your PCI device ID ? My worked ixgbe: > > >> > > > > > > Sorry, I missed the PKT_RX_L4_CKSUM_BAD information, yes, my NIC > have the issue. > > > > > >> 86:00.0 Ethernet controller [0200]: Intel Corporation 82599ES > > >> 10-Gigabit SFI/SFP+ Network > > Connection > > >> [8086:10fb] (rev 01) > > >> > > >> I'm wondering if people will complain that the patch will mark the > > >> real bad checksum UDP as > > > > > > Zero checksum is more popular case, please file a bug on > https://bugs.dpdk.org/ to trace the fix. > > > > > > Thanks for pointing it out. > > > > > > > ack, I'm going to file it. > > > > Thanks, > > Paolo > > > > >> GOOD. For handling this correctly, looks like driver needs to check > > >> the UDP's checksum value, if zero, then skip the error information, but > this makes driver do the network stack things ... > > >> > > >>
