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selftests: mptcp: add a check for sndbuf of S/C

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Add a new chk_sndbuf() helper to diag.sh that extracts the sndbuf
(the 'tb' field from 'ss -m' skmem output) for both server and
client MPTCP sockets, and verifies they are equal.

Without the previous patch, it will fail:

'''
07 ....chk sndbuf server/client    [FAIL] sndbuf S=20480 != C=2630656
'''

Signed-off-by: Gang Yan <yangang@kylinos.cn>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20260420-net-mptcp-sync-sndbuf-accept-v1-2-e3523e3aeb44@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Gang Yan
2026-04-20 18:19:24 +02:00
committed by Paolo Abeni
parent fcf04b1433
commit d0576eb850
1 changed files with 28 additions and 0 deletions
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28
tools/testing/selftests/net/mptcp/diag.sh
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@@ -322,6 +322,33 @@ wait_connected()
done
}
chk_sndbuf()
{
local server_sndbuf client_sndbuf msg
local port=${1}
msg="....chk sndbuf server/client"
server_sndbuf=$(ss -N "${ns}" -inmHM "sport" "${port}" | \
sed -n 's/.*tb\([0-9]\+\).*/\1/p')
client_sndbuf=$(ss -N "${ns}" -inmHM "dport" "${port}" | \
sed -n 's/.*tb\([0-9]\+\).*/\1/p')
mptcp_lib_print_title "${msg}"
if [ -z "${server_sndbuf}" ] || [ -z "${client_sndbuf}" ]; then
mptcp_lib_pr_fail "sndbuf S=${server_sndbuf} C=${client_sndbuf}"
mptcp_lib_result_fail "${msg}"
ret=${KSFT_FAIL}
elif [ "${server_sndbuf}" != "${client_sndbuf}" ]; then
mptcp_lib_pr_fail "sndbuf S=${server_sndbuf} != C=${client_sndbuf}"
mptcp_lib_result_fail "${msg}"
ret=${KSFT_FAIL}
else
mptcp_lib_pr_ok
mptcp_lib_result_pass "${msg}"
fi
}
trap cleanup EXIT
mptcp_lib_ns_init ns
@@ -341,6 +368,7 @@ echo "b" | \
127.0.0.1 >/dev/null &
wait_connected $ns 10000
chk_msk_nr 2 "after MPC handshake"
chk_sndbuf 10000
chk_last_time_info 10000
chk_msk_remote_key_nr 2 "....chk remote_key"
chk_msk_fallback_nr 0 "....chk no fallback"