NACK: [SRU][B:linux-azure-4.15][PULL v2] hv_netvsc: Add XDP support

[William Breathitt Gray]

On Thu, Jan 28, 2021 at 06:30:14AM -0500, William Breathitt Gray wrote:
> Changes in v2:
>  - Merge conflicts resolved involving 'hash_info' introduction in the
>    following patches:
>    * "hv_netvsc: pass netvsc_device to receive callback"
>    * "hv_netvsc: Add support for LRO/RSC in the vSwitch"
>    * "hv_netvsc: Add XDP support"
> 
> BugLink: https://bugs.launchpad.net/bugs/1877654
> 
> [Impact]
> 
> Microsoft would like to request the following three patches in all releases supported on Azure:
> 
> 351e1581395fc (“hv_netvsc: Add XDP support”)
> 12fa74383ed4d (“hv_netvsc: Update document for XDP support”)
> 184367dce4f7 (“hv_netvsc: Fix XDP refcnt for synthetic and VF NICs”)
> 
> These patches add support of XDP in native mode to the hv_netvsc driver, and
> transparently sets the XDP program on the associated VF NIC as well.
> 
> [Regression Potential]
> 
> The backport to Bionic:linux-azure-4.15 required a lot of context
> adjustments. Regression potentials are spread across a number of files
> and drivers. Most adjustments were trivial, but the changes in
> netvsc_drv.c should be kept an eye on. In particular, if a regression
> occurs it will likely happen in the netvsc_alloc_recv_skb(),
> netvsc_recv_callback(), or netvsc_devinfo_get() functions due to the
> context difference of these areas compared to the original patch.
> 
> In general, Linux 4.15 was missing key code for XDP. As such, many
> prelimary commit backports were required to pull in that support before
> it could be added to hv_netvsc driver in the primary backports.
> 
> [Miscellaneous]
> 
> The 5.4 version is already released so we do not need to worry about
> that series.
> 
> Backports of the "xdp: new XDP rx-queue info concept" patchset and "XDP
> redirect memory return API" patchset patches are included to add support
> for the XDP API:
> https://patchwork.ozlabs.org/project/netdev/cover/151497504273.18176.10177133999720101758.stgit@firesoul/
> https://patchwork.ozlabs.org/project/netdev/cover/152397622657.20272.10121948713784224943.stgit@firesoul/
> 
> William Breathitt Gray
> 
> -----
> 
> The following changes since commit 822cd876f23c1e6809e563c5c396216bdb131880:

Sorry, I hit send too soon here.

Nacked-by: William Breathitt Gray <william.gray at canonical.com>
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