From mboxrd@z Thu Jan 1 00:00:00 1970 From: kaike.wan-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org Subject: [PATCH v5 2/4] IB/core: Check the presence of netlink multicast group listeners Date: Thu, 11 Jun 2015 13:03:43 -0400 Message-ID: <1434042225-4975-3-git-send-email-kaike.wan@intel.com> References: <1434042225-4975-1-git-send-email-kaike.wan@intel.com> Return-path: In-Reply-To: <1434042225-4975-1-git-send-email-kaike.wan-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: Kaike Wan , John Fleck , Ira Weiny List-Id: linux-rdma@vger.kernel.org From: Kaike Wan This patch adds a function to check if listeners for a netlink multicast group are present. Signed-off-by: Kaike Wan Signed-off-by: John Fleck Signed-off-by: Ira Weiny Reviewed-by: Sean Hefty --- drivers/infiniband/core/netlink.c | 8 ++++++++ include/rdma/rdma_netlink.h | 7 +++++++ 2 files changed, 15 insertions(+), 0 deletions(-) diff --git a/drivers/infiniband/core/netlink.c b/drivers/infiniband/core/netlink.c index 23dd5a5..e0fc913 100644 --- a/drivers/infiniband/core/netlink.c +++ b/drivers/infiniband/core/netlink.c @@ -49,6 +49,14 @@ static DEFINE_MUTEX(ibnl_mutex); static struct sock *nls; static LIST_HEAD(client_list); +int ibnl_chk_listeners(unsigned int group) +{ + if (netlink_has_listeners(nls, group) == 0) + return -1; + return 0; +} +EXPORT_SYMBOL(ibnl_chk_listeners); + int ibnl_add_client(int index, int nops, const struct ibnl_client_cbs cb_table[]) { diff --git a/include/rdma/rdma_netlink.h b/include/rdma/rdma_netlink.h index 0790882..5852661 100644 --- a/include/rdma/rdma_netlink.h +++ b/include/rdma/rdma_netlink.h @@ -77,4 +77,11 @@ int ibnl_unicast(struct sk_buff *skb, struct nlmsghdr *nlh, int ibnl_multicast(struct sk_buff *skb, struct nlmsghdr *nlh, unsigned int group, gfp_t flags); +/** + * Check if there are any listeners to the netlink group + * @group: the netlink group ID + * Returns 0 on success or a negative for no listeners. + */ +int ibnl_chk_listeners(unsigned int group); + #endif /* _RDMA_NETLINK_H */ -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html