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Niklas Soderlund >> ; Kevin Traynor >> Cc: Xueming(Steven) Li ; dev@dpdk.org; Luca >> Boccassi ; oss-drivers ; Nole >> Zhang ; Kevin Liu ; >> stable@dpdk.org >> Subject: Re: [PATCH] net/nfp: support 48-bit DMA address for firmware with >> NFDk >> >> On 2/16/2023 10:41 AM, Chaoyong He wrote: >>> >>> >>>> -----Original Message----- >>>> From: Niklas Soderlund >>>> Sent: Thursday, February 16, 2023 6:37 PM >>>> To: Kevin Traynor >>>> Cc: Ferruh Yigit ; Xueming(Steven) Li >>>> ; Chaoyong He ; >>>> dev@dpdk.org; Luca Boccassi ; oss-drivers >>> drivers@corigine.com>; Nole Zhang ; Kevin >>>> Liu ; stable@dpdk.org >>>> Subject: Re: [PATCH] net/nfp: support 48-bit DMA address for firmware >>>> with NFDk >>>> >>>> Hi Kevin, >>>> >>>> Thanks for your input. >>>> >>>> On 2023-02-16 10:28:34 +0000, Kevin Traynor wrote: >>>>> On 15/02/2023 18:28, Ferruh Yigit wrote: >>>>>> On 2/15/2023 5:47 PM, Niklas Söderlund wrote: >>>>>>> Hi Ferruh, >>>>>>> >>>>>>> Thanks for your continues effort in dealing with NFP patches. >>>>>>> >>>>>>> On 2023-02-15 13:42:01 +0000, Ferruh Yigit wrote: >>>>>>>> On 2/8/2023 9:15 AM, Chaoyong He wrote: >>>>>>>>> From: Peng Zhang >>>>>>>>> >>>>>>>>> 48-bit DMA address is supported in the firmware with NFDk, so >>>>>>>>> enable this feature in PMD now. But the firmware with NFD3 still >>>>>>>>> just support 40-bit DMA address. >>>>>>>>> >>>>>>>>> RX free list descriptor, used by both NFD3 and NFDk, is also >>>>>>>>> modified to support 48-bit DMA address. That's OK because the >>>>>>>>> top bits is always set to 0 when assigned with 40-bit DMA address. >>>>>>>>> >>>>>>>>> Fixes: c73dced48c8c ("net/nfp: add NFDk Tx") >>>>>>>>> Cc: jin.liu@corigine.com >>>>>>>>> Cc: stable@dpdk.org >>>>>>>>> >>>>>>>> >>>>>>>> Why a backport is requested? As far as I understand this is not >>>>>>>> fixing anything but extending device capability. Is this a fix? >>>>>>> >>>>>>> I agree this is a bit of a grey zone. We reasoned this was a fix >>>>>>> as we should have done this from the start in the commit that >>>>>>> added support for NFDk. Are you OK moving forward with this as a >>>>>>> fix or would you prefer we resubmit without the request to backport? >>>>>>> >>>>>> >>>>>> I am not sure, is this change have any potential to change behavior >>>>>> for existing users? >>>>>> Like if one of your user is using 22.11.1 release, and if this >>>>>> patch backported to next LTS version, 22.11.2, will user notice any >> difference? >>>>>> >>>>>> >>>>>> @Luca, @Kevin, what is your comment as LTS maintainers? >>>>>> >>>>> >>>>> A bit difficult to know. If NFDk is not practicably usable without >>>>> it, then it could be considered a fix. If it's just extending to add >>>>> nice-to-have functionality then probably it is not a fix. >>>> >>>> I think we can treat this as a nice-to-have and not something that >>>> makes NFDk unusable. As stated above, we marked this as a Fix as we >>>> *really* should have done this in the commit which added NFDk support. >>>> >>>> @Ferruh, would you prefer we send a v2 or will you drop the Fixes and >>>> CC tags when/if applying? >>>> >>> >>> Actually, the DPDK app using the nfp card with a firmware of NFDk will >> coredump without this patch. >>> And that's the directly reason we consider backport this patch. >>> >> >> It has been long since NFDk FW support added, how a crash missed until this >> point, is it crashing in a edge case or something? >> > Yes, this occur in the server with CPU FT-2000/64, it has 2 PCIE1 x8 and 1 PCIE0 x16, > Pcie x8 can only support 48 bit, but the pcie16 can support 40bit. OK, can you please send a new version of the patch updating patch title and commit log to highlight that patch is fixing a crash. It can be helpful to detail the reason of crash in commit log. >>>>> >>>>> It would need to ensure that it is tested on 22.11 branch and there >>>>> are no regressions. It is only relevant to DPDK 22.11 LTS so Cc >>>>> Xueming who will ultimately decide. >>>>> >>>>> A guide below on some things to consider for this type of backport is >> here: >>>>> http://doc.dpdk.org/guides/contributing/stable.html#what-changes-sho >>>>> ul >>>>> d-be-backported >>>>> >>>>>>>> >>>>>>>>> Signed-off-by: Peng Zhang >>>>>>>>> Reviewed-by: Chaoyong He >>>>>>>>> Reviewed-by: Niklas Söderlund >>>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>>> -- >>>> Kind Regards, >>>> Niklas Söderlund >