[Xen-devel] [PATCH v2] public/io/netif.h: move and amend multicast control documentation

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

netif.h contains a specification of the XEN_NETIF_EXTRA_TYPE_MCAST_{ADD,DEL}
extra info messages require to manipulate a multicast filter list maintained
by a backend and specifies the xenstore negotiation protocol in a comment
just above the structure defintion, which is easy to miss.

This patch moves the documentation of the xenstore negotiation to be
co-located with the documentation for other features and also amends the
wording to be clearer.

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
---
 xen/include/public/io/netif.h |   22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/xen/include/public/io/netif.h b/xen/include/public/io/netif.h
index 353eab7..dfd0412 100644
--- a/xen/include/public/io/netif.h
+++ b/xen/include/public/io/netif.h
@@ -136,6 +136,20 @@
  */
 
 /*
+ * "feature-multicast-control" advertises the capability to filter ethernet
+ * multicast packets in the backend. To enable use of this capability the
+ * frontend must set "request-multicast-control" before moving into the
+ * connected state.
+ * If "request-multicast-control" is set then the backend transmit side should
+ * no longer flood multicast packets to the frontend, it should instead drop 
any
+ * multicast packet that does not match in a filter list. The list is
+ * amended by the frontend by sending dummy transmit requests containing
+ * XEN_NETIF_EXTRA_TYPE_MCAST_{ADD,DEL} extra-info fragments as specified 
below.
+ * Once enabled by the frontend, the feature cannot be disabled except by
+ * closing and re-connecting to the backend.
+ */
+
+/*
  * This is the 'wire' format for packets:
  *  Request 1: netif_tx_request_t -- NETTXF_* (any flags)
  * [Request 2: netif_extra_info_t] (only if request 1 has NETTXF_extra_info)
@@ -341,14 +355,6 @@ struct netif_extra_info {
 
         /*
          * XEN_NETIF_EXTRA_TYPE_MCAST_{ADD,DEL}:
-         * Backend advertises availability via 'feature-multicast-control'
-         * xenbus node containing value '1'.
-         * Frontend requests this feature by advertising
-         * 'request-multicast-control' xenbus node containing value '1'.
-         * If multicast control is requested then multicast flooding is
-         * disabled and the frontend must explicitly register its interest
-         * in multicast groups using dummy transmit requests containing
-         * MCAST_{ADD,DEL} extra-info fragments.
          */
         struct {
             uint8_t addr[6]; /* Address to add/remove. */
-- 
1.7.10.4


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