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1/* SPDX-License-Identifier: GPL-2.0-only */
2/******************************************************************************
3
4(c) 2008 NetApp. All Rights Reserved.
5
6
7******************************************************************************/
8
9/*
10 * Functions to create and manage the backchannel
11 */
12
13#ifndef _LINUX_SUNRPC_BC_XPRT_H
14#define _LINUX_SUNRPC_BC_XPRT_H
15
16#include <linux/sunrpc/svcsock.h>
17#include <linux/sunrpc/xprt.h>
18#include <linux/sunrpc/sched.h>
19
20#ifdef CONFIG_SUNRPC_BACKCHANNEL
21struct rpc_rqst *xprt_lookup_bc_request(struct rpc_xprt *xprt, __be32 xid);
22void xprt_complete_bc_request(struct rpc_rqst *req, uint32_t copied);
23void xprt_init_bc_request(struct rpc_rqst *req, struct rpc_task *task,
24 const struct rpc_timeout *to);
25void xprt_free_bc_request(struct rpc_rqst *req);
26int xprt_setup_backchannel(struct rpc_xprt *, unsigned int min_reqs);
27void xprt_destroy_backchannel(struct rpc_xprt *, unsigned int max_reqs);
28void xprt_enqueue_bc_request(struct rpc_rqst *req);
29
30/* Socket backchannel transport methods */
31int xprt_setup_bc(struct rpc_xprt *xprt, unsigned int min_reqs);
32void xprt_destroy_bc(struct rpc_xprt *xprt, unsigned int max_reqs);
33void xprt_free_bc_rqst(struct rpc_rqst *req);
34unsigned int xprt_bc_max_slots(struct rpc_xprt *xprt);
35void xprt_svc_destroy_nullify_bc(struct rpc_xprt *xprt, struct svc_serv **serv);
36
37/*
38 * Determine if a shared backchannel is in use
39 */
40static inline bool svc_is_backchannel(const struct svc_rqst *rqstp)
41{
42 return rqstp->rq_server->sv_bc_enabled;
43}
44
45static inline void set_bc_enabled(struct svc_serv *serv)
46{
47 serv->sv_bc_enabled = true;
48}
49#else /* CONFIG_SUNRPC_BACKCHANNEL */
50static inline int xprt_setup_backchannel(struct rpc_xprt *xprt,
51 unsigned int min_reqs)
52{
53 return 0;
54}
55
56static inline void xprt_destroy_backchannel(struct rpc_xprt *xprt,
57 unsigned int max_reqs)
58{
59}
60
61static inline bool svc_is_backchannel(const struct svc_rqst *rqstp)
62{
63 return false;
64}
65
66static inline void set_bc_enabled(struct svc_serv *serv)
67{
68}
69
70static inline void xprt_free_bc_request(struct rpc_rqst *req)
71{
72}
73
74static inline void xprt_svc_destroy_nullify_bc(struct rpc_xprt *xprt, struct svc_serv **serv)
75{
76 svc_destroy(serv);
77}
78#endif /* CONFIG_SUNRPC_BACKCHANNEL */
79#endif /* _LINUX_SUNRPC_BC_XPRT_H */