[dpdk-dev] [PATCH 06/14] eal: mp: end the multiprocess thread during cleanup
Stephen Hemminger
stephen at networkplumber.org
Sat Jan 4 02:33:33 CET 2020
When rte_eal_cleanup is called, all control threads should exit.
For the mp thread, this best handled by closing the mp_socket
and letting the thread see that.
This also fixes potential problems where the mp_socket gets
another hard error, and the thread runs away repeating itself
by reading the same error.
Fixes: 85d6815fa6d0 ("eal: close multi-process socket during cleanup")
Cc: qi.z.zhang at intel.com
Cc: stable at dpdk.org
Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
---
lib/librte_eal/common/eal_common_proc.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
diff --git a/lib/librte_eal/common/eal_common_proc.c b/lib/librte_eal/common/eal_common_proc.c
index 935e8fefeba8..f369d8bf6dd8 100644
--- a/lib/librte_eal/common/eal_common_proc.c
+++ b/lib/librte_eal/common/eal_common_proc.c
@@ -276,8 +276,17 @@ read_msg(struct mp_msg_internal *m, struct sockaddr_un *s)
msgh.msg_control = control;
msgh.msg_controllen = sizeof(control);
+retry:
msglen = recvmsg(mp_fd, &msgh, 0);
+
+ /* zero length message means socket was closed */
+ if (msglen == 0)
+ return 0;
+
if (msglen < 0) {
+ if (errno == EINTR)
+ goto retry;
+
RTE_LOG(ERR, EAL, "recvmsg failed, %s\n", strerror(errno));
return -1;
}
@@ -305,7 +314,7 @@ read_msg(struct mp_msg_internal *m, struct sockaddr_un *s)
RTE_LOG(ERR, EAL, "invalid received data length\n");
return -1;
}
- return 0;
+ return msglen;
}
static void
@@ -376,10 +385,8 @@ mp_handle(void *arg __rte_unused)
struct mp_msg_internal msg;
struct sockaddr_un sa;
- while (1) {
- if (read_msg(&msg, &sa) == 0)
- process_msg(&msg, &sa);
- }
+ while (read_msg(&msg, &sa) > 0)
+ process_msg(&msg, &sa);
return NULL;
}
--
2.20.1
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