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       1                 :            : /******************************************************************************
       2                 :            : 
       3                 :            : (c) 2008 NetApp.  All Rights Reserved.
       4                 :            : 
       5                 :            : NetApp provides this source code under the GPL v2 License.
       6                 :            : The GPL v2 license is available at
       7                 :            : http://opensource.org/licenses/gpl-license.php.
       8                 :            : 
       9                 :            : THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      10                 :            : "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      11                 :            : LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      12                 :            : A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
      13                 :            : CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
      14                 :            : EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
      15                 :            : PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
      16                 :            : PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
      17                 :            : LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
      18                 :            : NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
      19                 :            : SOFTWARE, 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>
      32                 :            : #include <linux/sunrpc/sched.h>
      33                 :            : 
      34                 :            : #ifdef CONFIG_SUNRPC_BACKCHANNEL
      35                 :            : struct rpc_rqst *xprt_lookup_bc_request(struct rpc_xprt *xprt, __be32 xid);
      36                 :            : void xprt_complete_bc_request(struct rpc_rqst *req, uint32_t copied);
      37                 :            : void xprt_init_bc_request(struct rpc_rqst *req, struct rpc_task *task);
      38                 :            : void xprt_free_bc_request(struct rpc_rqst *req);
      39                 :            : int xprt_setup_backchannel(struct rpc_xprt *, unsigned int min_reqs);
      40                 :            : void xprt_destroy_backchannel(struct rpc_xprt *, unsigned int max_reqs);
      41                 :            : 
      42                 :            : /* Socket backchannel transport methods */
      43                 :            : int xprt_setup_bc(struct rpc_xprt *xprt, unsigned int min_reqs);
      44                 :            : void xprt_destroy_bc(struct rpc_xprt *xprt, unsigned int max_reqs);
      45                 :            : void xprt_free_bc_rqst(struct rpc_rqst *req);
      46                 :            : unsigned int xprt_bc_max_slots(struct rpc_xprt *xprt);
      47                 :            : 
      48                 :            : /*
      49                 :            :  * Determine if a shared backchannel is in use
      50                 :            :  */
      51                 :            : static inline bool svc_is_backchannel(const struct svc_rqst *rqstp)
      52                 :            : {
      53                 :          0 :         return rqstp->rq_server->sv_bc_enabled;
      54                 :            : }
      55                 :            : 
      56                 :            : static inline void set_bc_enabled(struct svc_serv *serv)
      57                 :            : {
      58                 :          0 :         serv->sv_bc_enabled = true;
      59                 :            : }
      60                 :            : #else /* CONFIG_SUNRPC_BACKCHANNEL */
      61                 :            : static inline int xprt_setup_backchannel(struct rpc_xprt *xprt,
      62                 :            :                                          unsigned int min_reqs)
      63                 :            : {
      64                 :            :         return 0;
      65                 :            : }
      66                 :            : 
      67                 :            : static inline void xprt_destroy_backchannel(struct rpc_xprt *xprt,
      68                 :            :                                             unsigned int max_reqs)
      69                 :            : {
      70                 :            : }
      71                 :            : 
      72                 :            : static inline bool svc_is_backchannel(const struct svc_rqst *rqstp)
      73                 :            : {
      74                 :            :         return false;
      75                 :            : }
      76                 :            : 
      77                 :            : static inline void set_bc_enabled(struct svc_serv *serv)
      78                 :            : {
      79                 :            : }
      80                 :            : 
      81                 :            : static inline void xprt_free_bc_request(struct rpc_rqst *req)
      82                 :            : {
      83                 :            : }
      84                 :            : #endif /* CONFIG_SUNRPC_BACKCHANNEL */
      85                 :            : #endif /* _LINUX_SUNRPC_BC_XPRT_H */
      86                 :            :