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[bpf,1/2] selftests/bpf: Add apply_bytes test to test_txmsg_redir_wait_sndmem in test_sockmap

Message ID 20241016234838.3167769-2-zijianzhang@bytedance.com (mailing list archive)
State Needs ACK
Delegated to: BPF
Headers show
Series tcp_bpf: Fix the sk_mem_uncharge logic in tcp_bpf_sendmsg | expand

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netdev/check_selftest success No net selftest shell script
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Commit Message

Zijian Zhang Oct. 16, 2024, 11:48 p.m. UTC 
From: Zijian Zhang <zijianzhang@bytedance.com>

Add this to more comprehensively test the socket memory accounting logic
in the __SK_REDIRECT and __SK_DROP cases of tcp_bpf_sendmsg. We don't have
test when apply_bytes are not zero in test_txmsg_redir_wait_sndmem.
test_send_large has opt->rate=2, it will invoke sendmsg two times.
Specifically, the first sendmsg will trigger the case where the ret value
of tcp_bpf_sendmsg_redir is less than 0; while the second sendmsg happens
after the 3 seconds timeout, and it will trigger __SK_DROP because socket
c2 has been removed from the sockmap/hash.

Signed-off-by: Zijian Zhang <zijianzhang@bytedance.com>
---
 tools/testing/selftests/bpf/test_sockmap.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Comments

John Fastabend Nov. 21, 2024, 5:38 a.m. UTC | #1 
zijianzhang@ wrote:
> From: Zijian Zhang <zijianzhang@bytedance.com>
> 
> Add this to more comprehensively test the socket memory accounting logic
> in the __SK_REDIRECT and __SK_DROP cases of tcp_bpf_sendmsg. We don't have
> test when apply_bytes are not zero in test_txmsg_redir_wait_sndmem.
> test_send_large has opt->rate=2, it will invoke sendmsg two times.
> Specifically, the first sendmsg will trigger the case where the ret value
> of tcp_bpf_sendmsg_redir is less than 0; while the second sendmsg happens
> after the 3 seconds timeout, and it will trigger __SK_DROP because socket
> c2 has been removed from the sockmap/hash.
> 
> Signed-off-by: Zijian Zhang <zijianzhang@bytedance.com>
> ---

Thanks, sorry for the rather long delay.

Acked-by: John Fastabend <john.fastabend@gmail.com>
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/test_sockmap.c b/tools/testing/selftests/bpf/test_sockmap.c
index 3e02d7267de8..446f7cca56dc 100644
--- a/tools/testing/selftests/bpf/test_sockmap.c
+++ b/tools/testing/selftests/bpf/test_sockmap.c
@@ -1485,8 +1485,12 @@  static void test_txmsg_redir(int cgrp, struct sockmap_options *opt)
 
 static void test_txmsg_redir_wait_sndmem(int cgrp, struct sockmap_options *opt)
 {
-	txmsg_redir = 1;
 	opt->tx_wait_mem = true;
+	txmsg_redir = 1;
+	test_send_large(opt, cgrp);
+
+	txmsg_redir = 1;
+	txmsg_apply = 4097;
 	test_send_large(opt, cgrp);
 	opt->tx_wait_mem = false;
 }