diff options
| -rw-r--r-- | sys/net/if_atm.h | 2 | ||||
| -rw-r--r-- | sys/net/if_atmsubr.c | 57 |
2 files changed, 59 insertions, 0 deletions
diff --git a/sys/net/if_atm.h b/sys/net/if_atm.h index dc9fc6e..179caad 100644 --- a/sys/net/if_atm.h +++ b/sys/net/if_atm.h @@ -268,4 +268,6 @@ void atm_input(struct ifnet *, struct atm_pseudohdr *, struct mbuf *, void *); int atm_output(struct ifnet *, struct mbuf *, struct sockaddr *, struct rtentry *); +struct atmio_vcctable *atm_getvccs(struct atmio_vcc **, u_int, u_int, + struct mtx *, int); #endif diff --git a/sys/net/if_atmsubr.c b/sys/net/if_atmsubr.c index ed02c2b..55393a7 100644 --- a/sys/net/if_atmsubr.c +++ b/sys/net/if_atmsubr.c @@ -52,6 +52,7 @@ __FBSDID("$FreeBSD$"); #include <sys/sockio.h> #include <sys/errno.h> #include <sys/sysctl.h> +#include <sys/malloc.h> #include <net/if.h> #include <net/netisr.h> @@ -404,6 +405,62 @@ atm_ifdetach(struct ifnet *ifp) if_detach(ifp); } +/* + * Support routine for the SIOCATMGVCCS ioctl(). + * + * This routine assumes, that the private VCC structures used by the driver + * begin with a struct atmio_vcc. + * + * Return a table of VCCs in a freshly allocated memory area. + * Here we have a problem: we first count, how many vccs we need + * to return. The we allocate the memory and finally fill it in. + * Because we cannot lock while calling malloc, the number of active + * vccs may change while we're in malloc. So we allocate a couple of + * vccs more and if space anyway is not enough re-iterate. + * + * We could use an sx lock for the vcc tables. + */ +struct atmio_vcctable * +atm_getvccs(struct atmio_vcc **table, u_int size, u_int start, + struct mtx *lock, int waitok) +{ + u_int cid, alloc; + size_t len; + struct atmio_vcctable *vccs; + struct atmio_vcc *v; + + alloc = start + 10; + vccs = NULL; + + for (;;) { + len = sizeof(*vccs) + alloc * sizeof(vccs->vccs[0]); + vccs = reallocf(vccs, len, M_TEMP, + waitok ? M_WAITOK : M_NOWAIT); + if (vccs == NULL) + return (NULL); + bzero(vccs, len); + + vccs->count = 0; + v = vccs->vccs; + + mtx_lock(lock); + for (cid = 0; cid < size; cid++) + if (table[cid] != NULL) { + if (++vccs->count == alloc) + /* too many - try again */ + break; + *v++ = *table[cid]; + } + mtx_unlock(lock); + + if (cid == size) + break; + + alloc *= 2; + } + return (vccs); +} + static moduledata_t atm_mod = { "atm", NULL, |
