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selftests/bpf: check epoll readiness during reuseport migration

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Inside migrate_dance(), add epoll checks around shutdown() to
verify that the target listener is not ready before shutdown()
and becomes ready immediately after shutdown() triggers migration.

Cover TCP_ESTABLISHED and TCP_SYN_RECV. Exclude TCP_NEW_SYN_RECV
as it depends on later handshake completion.

Suggested-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Signed-off-by: Zhenzhong Wu <jt26wzz@gmail.com>
Link: https://patch.msgid.link/20260422024554.130346-3-jt26wzz@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Zhenzhong Wu
2026-04-22 10:45:54 +08:00
committed by Jakub Kicinski
parent 3864c6ba1e
commit c01cfc4886
1 changed files with 42 additions and 7 deletions
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49
tools/testing/selftests/bpf/prog_tests/migrate_reuseport.c
View File

@@ -7,24 +7,29 @@
* 3. call listen() for 1 server socket. (migration target)
* 4. update a map to migrate all child sockets
* to the last server socket (migrate_map[cookie] = 4)
* 5. call shutdown() for first 4 server sockets
* 5. for TCP_ESTABLISHED and TCP_SYN_RECV cases, verify via epoll
* that the last server socket is not ready before migration.
* 6. call shutdown() for first 4 server sockets
* and migrate the requests in the accept queue
* to the last server socket.
* 6. call listen() for the second server socket.
* 7. call shutdown() for the last server
* 7. for TCP_ESTABLISHED and TCP_SYN_RECV cases, verify via epoll
* that the last server socket is ready after migration.
* 8. call listen() for the second server socket.
* 9. call shutdown() for the last server
* and migrate the requests in the accept queue
* to the second server socket.
* 8. call listen() for the last server.
* 9. call shutdown() for the second server
* 10. call listen() for the last server.
* 11. call shutdown() for the second server
* and migrate the requests in the accept queue
* to the last server socket.
* 10. call accept() for the last server socket.
* 12. call accept() for the last server socket.
*
* Author: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
*/
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include <sys/epoll.h>
#include "test_progs.h"
#include "test_migrate_reuseport.skel.h"
@@ -350,21 +355,51 @@ static int update_maps(struct migrate_reuseport_test_case *test_case,
static int migrate_dance(struct migrate_reuseport_test_case *test_case)
{
struct epoll_event ev = {
.events = EPOLLIN,
};
int epoll = -1, nfds;
int i, err;
if (test_case->state != BPF_TCP_NEW_SYN_RECV) {
epoll = epoll_create1(0);
if (!ASSERT_NEQ(epoll, -1, "epoll_create1"))
return -1;
ev.data.fd = test_case->servers[MIGRATED_TO];
if (!ASSERT_OK(epoll_ctl(epoll, EPOLL_CTL_ADD,
test_case->servers[MIGRATED_TO], &ev),
"epoll_ctl"))
goto close_epoll;
nfds = epoll_wait(epoll, &ev, 1, 0);
if (!ASSERT_EQ(nfds, 0, "epoll_wait 1"))
goto close_epoll;
}
/* Migrate TCP_ESTABLISHED and TCP_SYN_RECV requests
* to the last listener based on eBPF.
*/
for (i = 0; i < MIGRATED_TO; i++) {
err = shutdown(test_case->servers[i], SHUT_RDWR);
if (!ASSERT_OK(err, "shutdown"))
return -1;
goto close_epoll;
}
/* No dance for TCP_NEW_SYN_RECV to migrate based on eBPF */
if (test_case->state == BPF_TCP_NEW_SYN_RECV)
return 0;
nfds = epoll_wait(epoll, &ev, 1, 0);
if (!ASSERT_EQ(nfds, 1, "epoll_wait 2")) {
close_epoll:
if (epoll >= 0)
close(epoll);
return -1;
}
close(epoll);
/* Note that we use the second listener instead of the
* first one here.
*