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Commit bc10ed7d authored by Kaike Wan's avatar Kaike Wan Committed by Doug Ledford
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IB/core: Add rdma netlink helper functions 



This patch adds a function to check if listeners for a netlink multicast
group are present. It also adds a function to receive netlink response
messages.

Signed-off-by: default avatarKaike Wan <kaike.wan@intel.com>
Signed-off-by: default avatarJohn Fleck <john.fleck@intel.com>
Signed-off-by: default avatarIra Weiny <ira.weiny@intel.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent 6431eb87

drivers/infiniband/core/netlink.c

+55 −0
Original line number Diff line number Diff line
@@ -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[])

{
@@ -151,6 +159,23 @@ static int ibnl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 
			    !client->cb_table[op].dump)

				return -EINVAL;



			/*

			 * For response or local service set_timeout request,

			 * there is no need to use netlink_dump_start.

			 */

			if (!(nlh->nlmsg_flags & NLM_F_REQUEST) ||

			    (index == RDMA_NL_LS &&

			     op == RDMA_NL_LS_OP_SET_TIMEOUT)) {

				struct netlink_callback cb = {

					.skb = skb,

					.nlh = nlh,

					.dump = client->cb_table[op].dump,

					.module = client->cb_table[op].module,

				};



				return cb.dump(skb, &cb);

			}



			{

				struct netlink_dump_control c = {

					.dump = client->cb_table[op].dump,
@@ -165,9 +190,39 @@ static int ibnl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 
	return -EINVAL;

}



static void ibnl_rcv_reply_skb(struct sk_buff *skb)

{

	struct nlmsghdr *nlh;

	int msglen;



	/*

	 * Process responses until there is no more message or the first

	 * request. Generally speaking, it is not recommended to mix responses

	 * with requests.

	 */

	while (skb->len >= nlmsg_total_size(0)) {

		nlh = nlmsg_hdr(skb);



		if (nlh->nlmsg_len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len)

			return;



		/* Handle response only */

		if (nlh->nlmsg_flags & NLM_F_REQUEST)

			return;



		ibnl_rcv_msg(skb, nlh);



		msglen = NLMSG_ALIGN(nlh->nlmsg_len);

		if (msglen > skb->len)

			msglen = skb->len;

		skb_pull(skb, msglen);

	}

}



static void ibnl_rcv(struct sk_buff *skb)

{

	mutex_lock(&ibnl_mutex);

	ibnl_rcv_reply_skb(skb);

	netlink_rcv_skb(skb, &ibnl_rcv_msg);

	mutex_unlock(&ibnl_mutex);

}

include/rdma/rdma_netlink.h

+7 −0
Original line number Diff line number Diff line
@@ -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 */