From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C28681DF97F for ; Thu, 4 Sep 2025 14:54:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756997652; cv=none; b=rd1tZAYS3NmdQcjYnNXUDxQ3HLO6LqyYYCQZiFJpRAlH7cU1YyXPqajSD5K1oYBSiUiGuqiWkM9Y364SRSuy615ycjr2voU/PfXe5A4i+jmMMPdT/GKK+3KXVYB+rAi/xmAlvyjIaPiUi+B9y3vP8bpnaGkaUyscs9o/z/a/ouE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756997652; c=relaxed/simple; bh=V/gP6j0lSeR3KdVzO+ilFVJlulH3EOIJmCWKFnNkGjA=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; b=TSBCalGqlpdmMzrm+IzRDyd6AajAImrdc6cwb8iohZPgYkF5JBUAIv4dA7zAZNAVkGfEqebocTUgNgeVRHQTKthzXup+b1rhirix7jZqzMxRpcjQADtuZNfr+1CyEIautagaF8homXRDC+dfHqqZ1OmeGZcKTriSaGExUTVn2eE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pA0KVNy2; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="pA0KVNy2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EE4FAC4CEF0 for ; Thu, 4 Sep 2025 14:54:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1756997652; bh=V/gP6j0lSeR3KdVzO+ilFVJlulH3EOIJmCWKFnNkGjA=; h=Date:Subject:To:References:From:In-Reply-To:From; b=pA0KVNy2XryD2SHmoTICoST3u0E94j38uh9ULhQeEF3dvOVYhELhWk+lX3uk/yesX jFrYZlfG93m4OaDJyNFjZWp2aE0RiH98PxTW6h6gwCqonyxnBi6efexopZ2hYErqxN Ax6bPn9oQJYxeFQA+ilxYM1Y2gLQ637KSy3OmAc1gc8EmyiZwr6BU6Wo5+Z6MRwuJ3 8THb0kRCTvEnCX8kSRCjK7gBV+4FS8NP5tKnSotRzox80ls0lQjdU808s4+iky8EPa q0QjFaCU8GEmc4u7ubZ6QmSjKJQstKJD7TrzptYg6gFf9qZSTnBSzEMDF2+Hqu9BXF 2AeKG0/h+VaDA== Message-ID: Date: Thu, 4 Sep 2025 16:54:09 +0200 Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH mptcp-next v2 2/3] selftests: mptcp: join: tolerate more ADD_ADDR Content-Language: en-GB, fr-BE To: MPTCP Linux References: <20250904-sft-mptcp-join-add_addr-no-retrans-v2-0-a019e6678628@kernel.org> <20250904-sft-mptcp-join-add_addr-no-retrans-v2-2-a019e6678628@kernel.org> From: Matthieu Baerts Autocrypt: addr=matttbe@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 04/09/2025 13:38, Matthieu Baerts (NGI0) wrote: > ADD_ADDR can be retransmitted, and with, the parent commit, these > retransmissions can be sent quicker: from 2 minutes to less than one > second. > > To avoid false positives where retransmitted ADD_ADDR causes higher > counters than expected, it is required to be more tolerant. Errors are > now only reported when fewer ADD_ADDRs have been sent/received, except > if no ADD_ADDR are expected. > > Before the parent commit, the tolerance was present for each tests where > the ADD_ADDR could be retransmitted in a reasonable time (1 sec). Now > that all tests can have retransmitted ADD_ADDR, it is normal to apply > the same tolerance for all tests. > > An alternative could be to disable the ADD_ADDR retransmissions by > default, but that's changing the default kernel behaviour. Plus, > ADD_ADDR retransmissions can be required for some tests. To avoid adding > exceptions to many tests, it seems better to increase the tolerance. > > Later, we could add a new MIB counter to identify the ADD_ADDR > retransmissions, and remove the tolerance when this counter is > available. > > Signed-off-by: Matthieu Baerts (NGI0) > --- > tools/testing/selftests/net/mptcp/mptcp_join.sh | 19 +++++++------------ > 1 file changed, 7 insertions(+), 12 deletions(-) > > diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh > index 2f046167a0b6cc6fb5531a033d8d95c9ea399cf9..be49712f91155a1f14f6cc21776764d65a897c27 100755 > --- a/tools/testing/selftests/net/mptcp/mptcp_join.sh > +++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh > @@ -358,6 +358,7 @@ reset_with_add_addr_timeout() > tables="${ip6tables}" > fi > > + # set a maximum, to avoid too long timeout with exponential backoff > ip netns exec $ns1 sysctl -q net.mptcp.add_addr_timeout=1 > > if ! ip netns exec $ns2 $tables -A OUTPUT -p tcp \ > @@ -1669,7 +1670,6 @@ chk_add_nr() > local tx="" > local rx="" > local count > - local timeout > > if [[ $ns_invert = "invert" ]]; then > ns_tx=$ns2 > @@ -1678,15 +1678,13 @@ chk_add_nr() > rx=" server" > fi > > - timeout=$(ip netns exec ${ns_tx} sysctl -n net.mptcp.add_addr_timeout) > - > print_check "add addr rx${rx}" > count=$(mptcp_lib_get_counter ${ns_rx} "MPTcpExtAddAddr") > if [ -z "$count" ]; then > print_skip > - # if the test configured a short timeout tolerate greater then expected > - # add addrs options, due to retransmissions > - elif [ "$count" != "$add_nr" ] && { [ "$timeout" -gt 1 ] || [ "$count" -lt "$add_nr" ]; }; then > + # Tolerate more ADD_ADDR then expected (if any), due to retransmissions > + elif [ "$count" -lt "$add_nr" ] || > + { [ "$count" != "$add_nr" ] && [ "$add_nr" != 0 ]; }; then Arf, it should be: "$add_nr" == 0 > fail_test "got $count ADD_ADDR[s] expected $add_nr" > else > print_ok > @@ -1774,18 +1772,15 @@ chk_add_tx_nr() > { > local add_tx_nr=$1 > local echo_tx_nr=$2 > - local timeout > local count > > - timeout=$(ip netns exec $ns1 sysctl -n net.mptcp.add_addr_timeout) > - > print_check "add addr tx" > count=$(mptcp_lib_get_counter ${ns1} "MPTcpExtAddAddrTx") > if [ -z "$count" ]; then > print_skip > - # if the test configured a short timeout tolerate greater then expected > - # add addrs options, due to retransmissions > - elif [ "$count" != "$add_tx_nr" ] && { [ "$timeout" -gt 1 ] || [ "$count" -lt "$add_tx_nr" ]; }; then > + # Tolerate more ADD_ADDR then expected (if any), due to retransmissions > + elif [ "$count" -lt "$add_tx_nr" ] || > + { [ "$count" != "$add_tx_nr" ] && [ "$add_tx_nr" != 0 ]; }; then Same here: "$add_tx_nr" == 0 If there is nothing else, I can fix that when applying the patches. > fail_test "got $count ADD_ADDR[s] TX, expected $add_tx_nr" > else > print_ok > Cheers, Matt -- Sponsored by the NGI0 Core fund.