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It's a common feature for all >>>> PMDs. >>>>>>>> It would make sense then to have max_rx_bufsize set to 16K by >>>> default >>>>>>>> in ethdev, and PMD could then raise/lower based on hardware. >>>>>>> It is not appropriate to set to 16K by default in ethdev layer. >>>>>>> Because I don't see any check for the upper bound in some driver, >>>> like >>>>>>> axgbe, enetc and so on. >>>>>>> I'm not sure if they have no upper bound. >>>>>>> And some driver's maximum buffer size is "16384(16K) - 128" >>>>>>> So it's better to set to UINT32_MAX by default. >>>>>>> what do you think? >>>>>> The goal is always giving application a working upper bound, and >>>>>> enforcing >>>>>> that as much as possible in ethdev layer. It doesnt matter which >>>> pattern >>>>>> does that. Fortunately, telling application an incorrect answer >> is >>>>>> not fatal. >>>>>> If over estimated, application pool would be wasting space. >>>>>> If under estimated, application will get more fragmented packets. >>>>> I know what you mean. >>>>> If we set UINT32_MAX, it just means that driver don't report this >>>> upper >>>>> bound. >>>>> This is also a very common way of handling. And it has no effect on >>>> the >>>>> drivers that doesn't report this value. >>>>> On the contrary, if we set a default value (like 16K) in ethdev, >> user >>>>> may be misunderstood and confused by that, right? >>>>> After all, this isn't the real upper bound of all drivers. And this >>>>> fixed default value may affect the behavior of some driver that I >>>> didn't >>>>> find their upper bound. >>>>> So I'd like to keep it as UINT32_MAX. >>>>> >>>> >>>> >>>> Hi Stephen, Morten, >>>> >>>> I saw scattered Rx mentioned, there may be some misalignment, >>>> the purpose of the patch is not to enable application to set as big >> as >>>> possible mbuf size, so that application can escape from parsing >>>> multi-segment mbufs. >>>> Indeed application can provide a large mbuf anyway, to have same >>>> result, >>>> without knowing this information. >>>> >>>> Main motivation is other way around, device may have restriction on >>>> buffer size that a single descriptor can address, independent from >>>> scattered Rx used, if mbuf size is bigger than this device limit, >> each >>>> mbuf will have some unused space. >>>> Patch has intention to inform this max per mbuf/descriptor buffer >> size, >>>> so that application doesn't allocate bigger mbuf and waste memory. >>> >>> Good point! >>> >>> Let's categorize this patch series as a memory optimization for >> applications that support jumbo frames, but are trying to avoid (or >> reduce) scattered RX. :-) >>> >> >> It is a memory optimization patch, but again nothing to do with jumbo >> frames or scattered Rx. > > I expect all NICs to support standard Ethernet frames without scattered RX. > > So I consider this patch related to jumbo frames (and non-scattered RX). Is there any other use case? > I was thinking this is mainly for miss configuration by the application, but if done intentionally yes intention of the application can be to receive jumbo frames.