+++ /dev/null
-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- */
-#ifndef _KPR_H
-#define _KPR_H
-
-# include <portals/lib-types.h> /* for ptl_hdr_t */
-
-/******************************************************************************/
-/* Kernel Portals Router interface */
-
-typedef void (*kpr_fwd_callback_t)(void *arg, int error); // completion callback
-
-/* space for routing targets to stash "stuff" in a forwarded packet */
-typedef union {
- long long _alignment;
- void *_space[16]; /* scale with CPU arch */
-} kprfd_scratch_t;
-
-/* Kernel Portals Routing Forwarded message Descriptor */
-typedef struct {
- struct list_head kprfd_list; /* stash in queues (routing target can use) */
- ptl_nid_t kprfd_target_nid; /* final destination NID */
- ptl_nid_t kprfd_gateway_nid; /* gateway NID */
- ptl_hdr_t *kprfd_hdr; /* header in wire byte order */
- int kprfd_nob; /* # payload bytes */
- int kprfd_niov; /* # payload frags */
- ptl_kiov_t *kprfd_kiov; /* payload fragments */
- void *kprfd_router_arg; /* originating NAL's router arg */
- kpr_fwd_callback_t kprfd_callback; /* completion callback */
- void *kprfd_callback_arg; /* completion callback arg */
- kprfd_scratch_t kprfd_scratch; /* scratchpad for routing targets */
-} kpr_fwd_desc_t;
-
-typedef void (*kpr_fwd_t)(void *arg, kpr_fwd_desc_t *fwd);
-typedef void (*kpr_notify_t)(void *arg, ptl_nid_t peer, int alive);
-
-/* NAL's routing interface (Kernel Portals Routing Nal Interface) */
-typedef const struct {
- int kprni_nalid; /* NAL's id */
- void *kprni_arg; /* Arg to pass when calling into NAL */
- kpr_fwd_t kprni_fwd; /* NAL's forwarding entrypoint */
- kpr_notify_t kprni_notify; /* NAL's notification entrypoint */
-} kpr_nal_interface_t;
-
-/* Router's routing interface (Kernel Portals Routing Router Interface) */
-typedef const struct {
- /* register the calling NAL with the router and get back the handle for
- * subsequent calls */
- int (*kprri_register) (kpr_nal_interface_t *nal_interface,
- void **router_arg);
-
- /* ask the router to find a gateway that forwards to 'nid' and is a
- * peer of the calling NAL; assume caller will send 'nob' bytes of
- * payload there */
- int (*kprri_lookup) (void *router_arg, ptl_nid_t nid, int nob,
- ptl_nid_t *gateway_nid);
-
- /* hand a packet over to the router for forwarding */
- kpr_fwd_t kprri_fwd_start;
-
- /* hand a packet back to the router for completion */
- void (*kprri_fwd_done) (void *router_arg, kpr_fwd_desc_t *fwd,
- int error);
-
- /* notify the router about peer state */
- void (*kprri_notify) (void *router_arg, ptl_nid_t peer,
- int alive, time_t when);
-
- /* the calling NAL is shutting down */
- void (*kprri_shutdown) (void *router_arg);
-
- /* deregister the calling NAL with the router */
- void (*kprri_deregister) (void *router_arg);
-
-} kpr_router_interface_t;
-
-/* Convenient struct for NAL to stash router interface/args */
-typedef struct {
- kpr_router_interface_t *kpr_interface;
- void *kpr_arg;
-} kpr_router_t;
-
-extern kpr_router_interface_t kpr_router_interface;
-
-static inline int
-kpr_register (kpr_router_t *router, kpr_nal_interface_t *nalif)
-{
- int rc;
-
- router->kpr_interface = PORTAL_SYMBOL_GET (kpr_router_interface);
- if (router->kpr_interface == NULL)
- return (-ENOENT);
-
- rc = (router->kpr_interface)->kprri_register (nalif, &router->kpr_arg);
- if (rc != 0)
- router->kpr_interface = NULL;
-
- PORTAL_SYMBOL_PUT (kpr_router_interface);
- return (rc);
-}
-
-static inline int
-kpr_routing (kpr_router_t *router)
-{
- return (router->kpr_interface != NULL);
-}
-
-static inline int
-kpr_lookup (kpr_router_t *router, ptl_nid_t nid, int nob, ptl_nid_t *gateway_nid)
-{
- if (!kpr_routing (router))
- return (-ENETUNREACH);
-
- return (router->kpr_interface->kprri_lookup(router->kpr_arg, nid, nob,
- gateway_nid));
-}
-
-static inline void
-kpr_fwd_init (kpr_fwd_desc_t *fwd, ptl_nid_t nid, ptl_hdr_t *hdr,
- int nob, int niov, ptl_kiov_t *kiov,
- kpr_fwd_callback_t callback, void *callback_arg)
-{
- fwd->kprfd_target_nid = nid;
- fwd->kprfd_gateway_nid = nid;
- fwd->kprfd_hdr = hdr;
- fwd->kprfd_nob = nob;
- fwd->kprfd_niov = niov;
- fwd->kprfd_kiov = kiov;
- fwd->kprfd_callback = callback;
- fwd->kprfd_callback_arg = callback_arg;
-}
-
-static inline void
-kpr_fwd_start (kpr_router_t *router, kpr_fwd_desc_t *fwd)
-{
- if (!kpr_routing (router))
- fwd->kprfd_callback (fwd->kprfd_callback_arg, -ENETUNREACH);
- else
- router->kpr_interface->kprri_fwd_start (router->kpr_arg, fwd);
-}
-
-static inline void
-kpr_fwd_done (kpr_router_t *router, kpr_fwd_desc_t *fwd, int error)
-{
- LASSERT (kpr_routing (router));
- router->kpr_interface->kprri_fwd_done (router->kpr_arg, fwd, error);
-}
-
-static inline void
-kpr_notify (kpr_router_t *router,
- ptl_nid_t peer, int alive, time_t when)
-{
- if (!kpr_routing (router))
- return;
-
- router->kpr_interface->kprri_notify(router->kpr_arg, peer, alive, when);
-}
-
-static inline void
-kpr_shutdown (kpr_router_t *router)
-{
- if (kpr_routing (router))
- router->kpr_interface->kprri_shutdown (router->kpr_arg);
-}
-
-static inline void
-kpr_deregister (kpr_router_t *router)
-{
- if (!kpr_routing (router))
- return;
- router->kpr_interface->kprri_deregister (router->kpr_arg);
- router->kpr_interface = NULL;
-}
-
-#endif /* _KPR_H */
git://git.whamcloud.com / fs / lustre-release.git / blobdiff