Re: [Xen-devel] [PATCH v4 1/5] public/io/netif.h: document the reality of netif_rx_request/reponse id

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 19.10.15 at 15:53, <paul.durrant@xxxxxxxxxx> wrote:
> The id field of the netif_rx_request_t abd netif_rx_response_t structures
> is actually useless.
> 
> Because GSO metadata is passed from backend to frontend using
> netif_extra_info segments, which do not carry information stating which
> netif_rx_request_t was consumed to free up their slot, frontends assume
> that the consumed request is the one that previously occupied that same
> slot in the shared ring. Also, whilst theoretically possible for other
> responses to be re-ordered, they never have been and that assumption has
> always been baked into Linux xen-netfront.

Is all this true even for frontends not supporting GSO and other
"extra" stuff?

Jan


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