blob: 969c0a671dbfbbab399f7472d501a93d75bbd8fc [file] [log] [blame]
Ricardo Labiaga4a8d70b2009-04-01 09:23:01 -04001/******************************************************************************
2
3(c) 2008 NetApp. All Rights Reserved.
4
5NetApp provides this source code under the GPL v2 License.
6The GPL v2 license is available at
7http://opensource.org/licenses/gpl-license.php.
8
9THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
10"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
11LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
12A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
13CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
14EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
15PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
16PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
17LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
18NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
19SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
20
21******************************************************************************/
22
23/*
24 * Functions to create and manage the backchannel
25 */
26
27#ifndef _LINUX_SUNRPC_BC_XPRT_H
28#define _LINUX_SUNRPC_BC_XPRT_H
29
30#include <linux/sunrpc/svcsock.h>
31#include <linux/sunrpc/xprt.h>
Ricardo Labiaga0d90ba12009-04-01 09:23:04 -040032#include <linux/sunrpc/sched.h>
Ricardo Labiaga4a8d70b2009-04-01 09:23:01 -040033
Trond Myklebust9e00abc2011-07-13 19:20:49 -040034#ifdef CONFIG_SUNRPC_BACKCHANNEL
Ricardo Labiaga4a8d70b2009-04-01 09:23:01 -040035struct rpc_rqst *xprt_alloc_bc_request(struct rpc_xprt *xprt);
36void xprt_free_bc_request(struct rpc_rqst *req);
37int xprt_setup_backchannel(struct rpc_xprt *, unsigned int min_reqs);
Trond Myklebust09acfea2012-03-11 15:22:54 -040038void xprt_destroy_backchannel(struct rpc_xprt *, unsigned int max_reqs);
Ricardo Labiaga0d90ba12009-04-01 09:23:04 -040039int bc_send(struct rpc_rqst *req);
Andy Adamsonba176862010-01-26 21:24:04 -050040
41/*
42 * Determine if a shared backchannel is in use
43 */
44static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
45{
Andy Adamson4a19de02011-01-06 02:04:35 +000046 if (rqstp->rq_server->sv_bc_xprt)
Andy Adamsonba176862010-01-26 21:24:04 -050047 return 1;
48 return 0;
49}
Trond Myklebust9e00abc2011-07-13 19:20:49 -040050#else /* CONFIG_SUNRPC_BACKCHANNEL */
Ricardo Labiaga4a8d70b2009-04-01 09:23:01 -040051static inline int xprt_setup_backchannel(struct rpc_xprt *xprt,
52 unsigned int min_reqs)
53{
54 return 0;
55}
Andy Adamsonba176862010-01-26 21:24:04 -050056
57static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
58{
59 return 0;
60}
Trond Myklebustc9acb422010-03-19 15:36:22 -040061
62static inline void xprt_free_bc_request(struct rpc_rqst *req)
63{
64}
Trond Myklebust9e00abc2011-07-13 19:20:49 -040065#endif /* CONFIG_SUNRPC_BACKCHANNEL */
Ricardo Labiaga4a8d70b2009-04-01 09:23:01 -040066#endif /* _LINUX_SUNRPC_BC_XPRT_H */
67