[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH net-next v4 1/5] xen-netback: add support for IPv6 checksum offload to guest
On Fri, 2013-10-11 at 16:06 +0100, Paul Durrant wrote: > Check xenstore flag feature-ipv6-csum-offload to determine if a > guest is happy to accept IPv6 packets with only partial checksum. > Also check analogous feature-ip-csum-offload to determine if a > guest is happy to accept IPv4 packets with only partial checksum > as a replacement for a negated feature-no-csum-offload value and > add a comment to deprecate use of feature-no-csum-offload. > > Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx> > Cc: Wei Liu <wei.liu2@xxxxxxxxxx> > Cc: David Vrabel <david.vrabel@xxxxxxxxxx> > Cc: Ian Campbell <ian.campbell@xxxxxxxxxx> Shouldn't this come later in the series, i.e. after netback is actually able to cope with ipv6 offloads? > diff --git a/drivers/net/xen-netback/common.h > b/drivers/net/xen-netback/common.h > index 5715318..b4a9a3c 100644 > --- a/drivers/net/xen-netback/common.h > +++ b/drivers/net/xen-netback/common.h > @@ -153,7 +153,8 @@ struct xenvif { > u8 can_sg:1; > u8 gso:1; > u8 gso_prefix:1; > - u8 csum:1; > + u8 ip_csum:1; > + u8 ipv6_csum:1; Why not ipv4_csum for consistency/unambiguity? > diff --git a/include/xen/interface/io/netif.h > b/include/xen/interface/io/netif.h > index eb262e3..d9fb44739 100644 > --- a/include/xen/interface/io/netif.h > +++ b/include/xen/interface/io/netif.h > @@ -51,6 +51,16 @@ > */ > > /* > + * "feature-no-csum-offload" was used to turn off IPv4 TCP/UDP checksum > + * offload but is now deprecated. Two new feature flags should now be used > + * to control checksum offload: How is a frontend to know which sort of backend it is talking too? Is there going to be a feature flag to indicate support for these new flags? In particular a new frontend running on an old backend needs to know that it needs to set no-csum-offload instead of ip-csum-offload somehow. > + * "feature-ip-csum-offload" should be used to turn IPv4 TCP/UDP checksum "ipv4" again? > + * offload on or off. 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 > + * offload on or off. If it is missing then the feature is assumed to be off. > + */ > + > +/* > * This is the 'wire' format for packets: > * Request 1: xen_netif_tx_request -- XEN_NETTXF_* (any flags) > * [Request 2: xen_netif_extra_info] (only if request 1 has > XEN_NETTXF_extra_info) _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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