On Tue, 29 Oct 2019 19:17:25 +0000 Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> wrote: > > -----Original Message----- > > From: Jakub Kicinski <jakub.kicinski@xxxxxxxxxxxxx> > > Sent: Monday, October 28, 2019 5:33 PM > > To: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> > > Cc: sashal@xxxxxxxxxx; linux-hyperv@xxxxxxxxxxxxxxx; > > netdev@xxxxxxxxxxxxxxx; KY Srinivasan <kys@xxxxxxxxxxxxx>; Stephen > > Hemminger <sthemmin@xxxxxxxxxxxxx>; olaf@xxxxxxxxx; vkuznets > > <vkuznets@xxxxxxxxxx>; davem@xxxxxxxxxxxxx; linux- > > kernel@xxxxxxxxxxxxxxx > > Subject: Re: [PATCH net-next, 3/4] hv_netvsc: Add XDP support > > > > On Mon, 28 Oct 2019 21:07:04 +0000, Haiyang Zhang wrote: > > > This patch adds support of XDP in native mode for hv_netvsc driver, and > > > transparently sets the XDP program on the associated VF NIC as well. > > > > > > XDP program cannot run with LRO (RSC) enabled, so you need to disable > > LRO > > > before running XDP: > > > ethtool -K eth0 lro off > > > > > > XDP actions not yet supported: > > > XDP_TX, XDP_REDIRECT > > > > I don't think we want to merge support without at least XDP_TX these > > days.. > Thanks for your detailed comments -- > I'm working on the XDP_TX... > > > > > And without the ability to prepend headers this may be the least > > complete initial XDP implementation we've seen :( > The RNDIS packet buffer received by netvsc doesn't have a head room, but I'm > considering copy the packets to the page buffer, with a head room space > reserved for XDP. There is a small amount of headroom available by reusing the RNDIS header and packet space. Looks like 40 bytes or so.
