The branch main has been updated by melifaro: URL: https://cgit.FreeBSD.org/src/commit/?id=df2b419a4105588384a89a57442ed6c6ca002455
commit df2b419a4105588384a89a57442ed6c6ca002455 Author: Alexander V. Chernikov <[email protected]> AuthorDate: 2023-03-04 10:09:09 +0000 Commit: Alexander V. Chernikov <[email protected]> CommitDate: 2023-03-06 15:08:08 +0000 ifnet: add if_foreach_sleep() to allow ifnet iterations with sleep. Subscribers: imp, ae, glebius Differential Revision: https://reviews.freebsd.org/D38904 --- sys/net/if.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ sys/net/if_var.h | 2 ++ 2 files changed, 67 insertions(+) diff --git a/sys/net/if.c b/sys/net/if.c index 58711061eb5e..f3ef822178ff 100644 --- a/sys/net/if.c +++ b/sys/net/if.c @@ -4535,6 +4535,71 @@ if_foreach(if_foreach_cb_t cb, void *cb_arg) return (error); } +/* + * Iterates over the list of interfaces, permitting callback function @cb to sleep. + * Stops iteration if @cb returns non-zero error code. + * Returns the last error code from @cb. + * @match_cb: optional match callback limiting the iteration to only matched interfaces + * @match_arg: argument to pass to @match_cb + * @cb: iteration callback + * @cb_arg: argument to pass to @cb + */ +int +if_foreach_sleep(if_foreach_match_t match_cb, void *match_arg, if_foreach_cb_t cb, + void *cb_arg) +{ + int match_count = 0, array_size = 16; /* 128 bytes for malloc */ + struct ifnet **match_array = NULL; + int error = 0; + + MPASS(cb); + + while (true) { + struct ifnet **new_array; + int new_size = array_size; + struct epoch_tracker et; + struct ifnet *ifp; + + while (new_size < match_count) + new_size *= 2; + new_array = malloc(new_size * sizeof(void *), M_TEMP, M_WAITOK); + if (match_array != NULL) + memcpy(new_array, match_array, array_size * sizeof(void *)); + free(match_array, M_TEMP); + match_array = new_array; + array_size = new_size; + + match_count = 0; + NET_EPOCH_ENTER(et); + CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { + if (match_cb != NULL && !match_cb(ifp, match_arg)) + continue; + if (match_count < array_size) { + if (if_try_ref(ifp)) + match_array[match_count++] = ifp; + } else + match_count++; + } + NET_EPOCH_EXIT(et); + + if (match_count > array_size) { + for (int i = 0; i < array_size; i++) + if_rele(match_array[i]); + continue; + } else { + for (int i = 0; i < match_count; i++) { + if (error == 0) + error = cb(match_array[i], cb_arg); + if_rele(match_array[i]); + } + free(match_array, M_TEMP); + break; + } + } + + return (error); +} + u_int if_foreach_lladdr(if_t ifp, iflladdr_cb_t cb, void *cb_arg) { diff --git a/sys/net/if_var.h b/sys/net/if_var.h index c9b2de736d10..3e4d6c883c13 100644 --- a/sys/net/if_var.h +++ b/sys/net/if_var.h @@ -680,7 +680,9 @@ typedef u_int if_addr_cb_t(void *, struct ifaddr *, u_int); u_int if_foreach_addr_type(if_t ifp, int type, if_addr_cb_t cb, void *cb_arg); typedef int (*if_foreach_cb_t)(if_t, void *); +typedef bool (*if_foreach_match_t)(if_t, void *); int if_foreach(if_foreach_cb_t, void *); +int if_foreach_sleep(if_foreach_match_t, void *, if_foreach_cb_t, void *); /* Functions */ void if_setinitfn(if_t ifp, if_init_fn_t);
