RE: [PATCH V6 net-next 5/5] xen-net{back,front}: Document multi-queue feature in netif.h

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



> -----Original Message-----
> From: Andrew J. Bennieston [mailto:andrew.bennieston@xxxxxxxxxx]
> Sent: 03 March 2014 11:48
> To: xen-devel@xxxxxxxxxxxxxxxxxxxx
> Cc: Ian Campbell; Wei Liu; Paul Durrant; netdev@xxxxxxxxxxxxxxx; David
> Vrabel; Andrew Bennieston
> Subject: [PATCH V6 net-next 5/5] xen-net{back,front}: Document multi-
> queue feature in netif.h
> 
> 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.
> 
> Signed-off-by: Andrew J. Bennieston <andrew.bennieston@xxxxxxxxxx>

Reviewed-by: Paul Durrant <paul.durrant@xxxxxxxxxx>

> ---
>  include/xen/interface/io/netif.h |   29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/include/xen/interface/io/netif.h
> b/include/xen/interface/io/netif.h
> index c50061d..a375a75 100644
> --- a/include/xen/interface/io/netif.h
> +++ b/include/xen/interface/io/netif.h
> @@ -51,6 +51,35 @@
>   */
> 
>  /*
> + * 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
> --
> 1.7.10.4

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Kernel Discussion]     [TCP Instrumentation]     [Ethernet Bridging]     [Linux Wireless Networking]     [Linux WPAN Networking]     [Linux Host AP]     [Linux WPAN Networking]     [Linux Bluetooth Networking]     [Linux ATH6KL Networking]     [Linux Networking Users]     [Linux Coverity]     [VLAN]     [Git]     [IETF Annouce]     [Linux Assembly]     [Security]     [Bugtraq]     [Yosemite Information]     [MIPS Linux]     [ARM Linux Kernel]     [ARM Linux]     [Linux Virtualization]     [Linux IDE]     [Linux RAID]     [Linux SCSI]