From 579a4ccc345c1932ff75259463ffde64722a16a9 Mon Sep 17 00:00:00 2001 From: Anatoly Burakov Date: Tue, 13 Mar 2018 17:42:40 +0000 Subject: [PATCH 1/1] eal: ignore IPC messages until init is complete If we receive messages that don't have a callback registered for them, and we haven't finished initialization yet, it can be reasonably inferred that we shouldn't have gotten the message in the first place. Therefore, send requester a special message telling them to ignore response to this request, as if this process wasn't there. Since it is not possible for primary process to receive any messages during initialization, this change in practice only applies to secondary processes. Signed-off-by: Anatoly Burakov Acked-by: Jianfeng Tan --- lib/librte_eal/common/eal_common_proc.c | 38 +++++++++++++++++++++---- 1 file changed, 33 insertions(+), 5 deletions(-) diff --git a/lib/librte_eal/common/eal_common_proc.c b/lib/librte_eal/common/eal_common_proc.c index fe27d6807d..4131b67b02 100644 --- a/lib/librte_eal/common/eal_common_proc.c +++ b/lib/librte_eal/common/eal_common_proc.c @@ -52,6 +52,7 @@ enum mp_type { MP_MSG, /* Share message with peers, will not block */ MP_REQ, /* Request for information, Will block for a reply */ MP_REP, /* Response to previously-received request */ + MP_IGN, /* Response telling requester to ignore this response */ }; struct mp_msg_internal { @@ -78,6 +79,11 @@ static struct { .lock = PTHREAD_MUTEX_INITIALIZER }; +/* forward declarations */ +static int +mp_send(struct rte_mp_msg *msg, const char *peer, int type); + + static struct sync_request * find_sync_request(const char *dst, const char *act_name) { @@ -260,12 +266,13 @@ process_msg(struct mp_msg_internal *m, struct sockaddr_un *s) RTE_LOG(DEBUG, EAL, "msg: %s\n", msg->name); - if (m->type == MP_REP) { + if (m->type == MP_REP || m->type == MP_IGN) { pthread_mutex_lock(&sync_requests.lock); sync_req = find_sync_request(s->sun_path, msg->name); if (sync_req) { memcpy(sync_req->reply, msg, sizeof(*msg)); - sync_req->reply_received = 1; + /* -1 indicates that we've been asked to ignore */ + sync_req->reply_received = m->type == MP_REP ? 1 : -1; pthread_cond_signal(&sync_req->cond); } else RTE_LOG(ERR, EAL, "Drop mp reply: %s\n", msg->name); @@ -279,10 +286,23 @@ process_msg(struct mp_msg_internal *m, struct sockaddr_un *s) action = entry->action; pthread_mutex_unlock(&mp_mutex_action); - if (!action) - RTE_LOG(ERR, EAL, "Cannot find action: %s\n", msg->name); - else if (action(msg, s->sun_path) < 0) + if (!action) { + if (m->type == MP_REQ && !internal_config.init_complete) { + /* if this is a request, and init is not yet complete, + * and callback wasn't registered, we should tell the + * requester to ignore our existence because we're not + * yet ready to process this request. + */ + struct rte_mp_msg dummy; + memset(&dummy, 0, sizeof(dummy)); + mp_send(&dummy, s->sun_path, MP_IGN); + } else { + RTE_LOG(ERR, EAL, "Cannot find action: %s\n", + msg->name); + } + } else if (action(msg, s->sun_path) < 0) { RTE_LOG(ERR, EAL, "Fail to handle message: %s\n", msg->name); + } } static void * @@ -631,6 +651,14 @@ mp_request_one(const char *dst, struct rte_mp_msg *req, rte_errno = ETIMEDOUT; return -1; } + if (sync_req.reply_received == -1) { + RTE_LOG(DEBUG, EAL, "Asked to ignore response\n"); + /* not receiving this message is not an error, so decrement + * number of sent messages + */ + reply->nb_sent--; + return 0; + } tmp = realloc(reply->msgs, sizeof(msg) * (reply->nb_received + 1)); if (!tmp) { -- 2.20.1