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IB/core: Add rdma netlink helper functions

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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: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: John Fleck <john.fleck@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Kaike Wan 2015-08-14 08:52:07 -04:00 committed by Doug Ledford
parent 6431eb8706
commit bc10ed7d3d
2 changed files with 62 additions and 0 deletions
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55
drivers/infiniband/core/netlink.c
View File

@ -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);
}

7
include/rdma/rdma_netlink.h
View File

@ -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 */