[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH RESEND] netif.h: Document xen-net{back, front} multi-queue feature
On Tue, 2014-04-29 at 17:15 +0100, Andrew J. Bennieston wrote: > From: "Andrew J. Bennieston" <andrew.bennieston@xxxxxxxxxx> > > Document the multi-queue feature in terms of XenStore keys to be written > by the backend and by the frontend. You seem to have missed my comments on v2 in <1394714132.25873.56.camel@xxxxxxxxxxxxxxxxxxxxxx>, dated "Thu, 13 Mar 2014 12:35:32 +0000". Ian. > > Signed-off-by: Andrew J. Bennieston <andrew.bennieston@xxxxxxxxxx> > --- > xen/include/public/io/netif.h | 29 +++++++++++++++++++++++++++++ > 1 file changed, 29 insertions(+) > > diff --git a/xen/include/public/io/netif.h b/xen/include/public/io/netif.h > index d7fb771..5d98734 100644 > --- a/xen/include/public/io/netif.h > +++ b/xen/include/public/io/netif.h > @@ -69,6 +69,35 @@ > */ > > /* > + * Multiple transmit and receive queues: > + * If supported, the backend will write "multi-queue-max-queues" and set its > + * value to the maximum supported number of queues. > + * Frontends that are aware of this feature and wish to use it can write the > + * key "multi-queue-num-queues", set to the number they wish to use. > + * > + * Queues replicate the shared rings and event channels, and > + * "feature-split-event-channels" may be used when using multiple queues. > + * Each queue consists of one shared ring pair, i.e. there must be the same > + * number of tx and rx rings. > + * > + * For frontends requesting just one queue, the usual event-channel and > + * ring-ref keys are written as before, simplifying the backend processing > + * to avoid distinguishing between a frontend that doesn't understand the > + * multi-queue feature, and one that does, but requested only one queue. > + * > + * Frontends requesting two or more queues must not write the toplevel > + * event-channel (or event-channel-{tx,rx}) and {tx,rx}-ring-ref keys, > + * instead writing them under sub-keys having the name "queue-N" where > + * N is the integer ID of the queue for which those keys belong. Queues > + * are indexed from zero. > + * > + * Mapping of packets to queues is considered to be a function of the > + * transmitting system (backend or frontend) and is not negotiated > + * between the two. Guests are free to transmit packets on any queue > + * they choose, provided it has been set up correctly. > + */ > + > +/* > * "feature-no-csum-offload" should be used to turn IPv4 TCP/UDP checksum > * offload off or on. If it is missing then the feature is assumed to be on. > * "feature-ipv6-csum-offload" should be used to turn IPv6 TCP/UDP checksum _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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