[PATCH mptcp-next v15 0/7] userspace pm remove id 0 subflow & address

[PATCH mptcp-next v15 0/7] userspace pm remove id 0 subflow & address

[Geliang Tang]

v15:
 - update __mptcp_has_initial_subflow
 - address Matt's comments in v14.

v14:
 - reuse MPTCP_CF_FASTCLOSE flag.
 - use tcp_shutdown instead of mptcp_subflow_shutdown.

v13:
 - invoke mptcp_subflow_shutdown() in patch 1 as Paolo suggested.

v12:
 - address Matt's comments in v11.

v11:
 - avoid sending RSTs.
 - rename 'id 0 subflow' to 'inital subflow'.

Geliang Tang (6):
  mptcp: add __mptcp_subflow_disconnect helper
  Squash to "mptcp: add mptcpi_subflows_total counter"
  selftests: mptcp: userspace pm remove initial subflow
  mptcp: userspace pm send RM_ADDR for ID 0
  mptcp: userspace pm rename remove_err to out
  selftests: mptcp: userspace pm send RM_ADDR for ID 0

Matthieu Baerts (1):
  selftests: mptcp: join: no RST when rm subflow/addr

 net/mptcp/pm_userspace.c                      | 45 +++++++++++-
 net/mptcp/protocol.c                          | 28 ++++++--
 net/mptcp/protocol.h                          |  3 +-
 .../testing/selftests/net/mptcp/mptcp_join.sh | 68 +++++++++++++++++++
 4 files changed, 134 insertions(+), 10 deletions(-)

-- 
2.35.3

[PATCH mptcp-next v15 1/7] selftests: mptcp: join: no RST when rm subflow/addr

[Geliang Tang]

From: Matthieu Baerts <matttbe@kernel.org>

Recently, we noticed that some RST were wrongly generated when removing
the initial subflow.

This patch makes sure RST are not sent when removing any subflows or any
addresses.

Signed-off-by: Matthieu Baerts <matttbe@kernel.org>
---
 tools/testing/selftests/net/mptcp/mptcp_join.sh | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index 01480663c102..ab6908b7b143 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -2343,6 +2343,7 @@ remove_tests()
 		chk_join_nr 1 1 1
 		chk_rm_tx_nr 1
 		chk_rm_nr 1 1
+		chk_rst_nr 0 0
 	fi
 
 	# multiple subflows, remove
@@ -2355,6 +2356,7 @@ remove_tests()
 			run_tests $ns1 $ns2 10.0.1.1
 		chk_join_nr 2 2 2
 		chk_rm_nr 2 2
+		chk_rst_nr 0 0
 	fi
 
 	# single address, remove
@@ -2367,6 +2369,7 @@ remove_tests()
 		chk_join_nr 1 1 1
 		chk_add_nr 1 1
 		chk_rm_nr 1 1 invert
+		chk_rst_nr 0 0
 	fi
 
 	# subflow and signal, remove
@@ -2380,6 +2383,7 @@ remove_tests()
 		chk_join_nr 2 2 2
 		chk_add_nr 1 1
 		chk_rm_nr 1 1
+		chk_rst_nr 0 0
 	fi
 
 	# subflows and signal, remove
@@ -2394,6 +2398,7 @@ remove_tests()
 		chk_join_nr 3 3 3
 		chk_add_nr 1 1
 		chk_rm_nr 2 2
+		chk_rst_nr 0 0
 	fi
 
 	# addresses remove
@@ -2408,6 +2413,7 @@ remove_tests()
 		chk_join_nr 3 3 3
 		chk_add_nr 3 3
 		chk_rm_nr 3 3 invert
+		chk_rst_nr 0 0
 	fi
 
 	# invalid addresses remove
@@ -2422,6 +2428,7 @@ remove_tests()
 		chk_join_nr 1 1 1
 		chk_add_nr 3 3
 		chk_rm_nr 3 1 invert
+		chk_rst_nr 0 0
 	fi
 
 	# subflows and signal, flush
@@ -2436,6 +2443,7 @@ remove_tests()
 		chk_join_nr 3 3 3
 		chk_add_nr 1 1
 		chk_rm_nr 1 3 invert simult
+		chk_rst_nr 0 0
 	fi
 
 	# subflows flush
@@ -2455,6 +2463,7 @@ remove_tests()
 		else
 			chk_rm_nr 3 3
 		fi
+		chk_rst_nr 0 0
 	fi
 
 	# addresses flush
@@ -2469,6 +2478,7 @@ remove_tests()
 		chk_join_nr 3 3 3
 		chk_add_nr 3 3
 		chk_rm_nr 3 3 invert simult
+		chk_rst_nr 0 0
 	fi
 
 	# invalid addresses flush
@@ -2483,6 +2493,7 @@ remove_tests()
 		chk_join_nr 1 1 1
 		chk_add_nr 3 3
 		chk_rm_nr 3 1 invert
+		chk_rst_nr 0 0
 	fi
 
 	# remove id 0 subflow
@@ -2494,6 +2505,7 @@ remove_tests()
 			run_tests $ns1 $ns2 10.0.1.1
 		chk_join_nr 1 1 1
 		chk_rm_nr 1 1
+		chk_rst_nr 0 0 ## TODO: currently failing, Geliang is working on a fix
 	fi
 
 	# remove id 0 address
@@ -2506,6 +2518,7 @@ remove_tests()
 		chk_join_nr 1 1 1
 		chk_add_nr 1 1
 		chk_rm_nr 1 1 invert
+		chk_rst_nr 0 0 invert ## TODO: currently failing, Geliang is working on a fix
 	fi
 }
 
-- 
2.35.3

[PATCH mptcp-next v15 2/7] mptcp: add __mptcp_subflow_disconnect helper

[Geliang Tang]

When closing the msk->first socket in __mptcp_close_ssk(), if there's
another subflow available, it's better to avoid resetting it, just shut
down it.

This patch adds a new helper __mptcp_subflow_disconnect(), and reuse
flag MPTCP_CF_FASTCLOSE in this case. When MPTCP_CF_FASTCLOSE isn't set,
we invoke tcp_shutdown() instead of tcp_disconnect().

Co-developed-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
 net/mptcp/protocol.c | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 30e0c29ae0a4..1a54d55f8bb2 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2366,6 +2366,26 @@ bool __mptcp_retransmit_pending_data(struct sock *sk)
 #define MPTCP_CF_PUSH		BIT(1)
 #define MPTCP_CF_FASTCLOSE	BIT(2)
 
+/* be sure to send a reset only if the caller asked for it, also
+ * clean completely the subflow status when the subflow reaches
+ * TCP_CLOSE state
+ */
+static void __mptcp_subflow_disconnect(struct sock *ssk,
+				       struct mptcp_subflow_context *subflow,
+				       unsigned int flags)
+{
+	if (((1 << ssk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN)) ||
+	    (flags & MPTCP_CF_FASTCLOSE)) {
+		/* The MPTCP code never wait on the subflow sockets, TCP-level
+		 * disconnect should never fail
+		 */
+		WARN_ON_ONCE(tcp_disconnect(ssk, 0));
+		mptcp_subflow_ctx_reset(subflow);
+	} else {
+		tcp_shutdown(ssk, SEND_SHUTDOWN);
+	}
+}
+
 /* subflow sockets can be either outgoing (connect) or incoming
  * (accept).
  *
@@ -2403,7 +2423,7 @@ static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
 	lock_sock_nested(ssk, SINGLE_DEPTH_NESTING);
 
 	if ((flags & MPTCP_CF_FASTCLOSE) && !__mptcp_check_fallback(msk)) {
-		/* be sure to force the tcp_disconnect() path,
+		/* be sure to force the tcp_close path
 		 * to generate the egress reset
 		 */
 		ssk->sk_lingertime = 0;
@@ -2413,11 +2433,7 @@ static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
 
 	need_push = (flags & MPTCP_CF_PUSH) && __mptcp_retransmit_pending_data(sk);
 	if (!dispose_it) {
-		/* The MPTCP code never wait on the subflow sockets, TCP-level
-		 * disconnect should never fail
-		 */
-		WARN_ON_ONCE(tcp_disconnect(ssk, 0));
-		mptcp_subflow_ctx_reset(subflow);
+		__mptcp_subflow_disconnect(ssk, subflow, flags);
 		release_sock(ssk);
 
 		goto out;
-- 
2.35.3

[PATCH mptcp-next v15 3/7] Squash to "mptcp: add mptcpi_subflows_total counter"

[Geliang Tang]

When the socket shuts down, it's state is TCPF_FIN_WAIT2. Add this into
__mptcp_has_initial_subflow.

Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
 net/mptcp/protocol.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 6508179e94a6..ccb97b747527 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -1081,7 +1081,8 @@ static inline bool __mptcp_has_initial_subflow(const struct mptcp_sock *msk)
 {
 	struct sock *ssk = READ_ONCE(msk->first);
 
-	return ssk && inet_sk_state_load(ssk) != TCP_CLOSE;
+	return ssk &&
+	       !((1 << inet_sk_state_load(ssk)) & (TCPF_FIN_WAIT2 | TCPF_CLOSE));
 }
 
 static inline void mptcp_do_fallback(struct sock *ssk)
-- 
2.35.3

[PATCH mptcp-next v15 4/7] selftests: mptcp: userspace pm remove initial subflow

[Geliang Tang]

This patch adds a selftest for userpsace PM to remove the initial
subflow. Use userspace_pm_add_sf() to add a subflow, and pass initial
ip address to userspace_pm_rm_sf() to remove the initial subflow.

Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
 .../testing/selftests/net/mptcp/mptcp_join.sh | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index ab6908b7b143..154978481409 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -3507,6 +3507,32 @@ userspace_tests()
 		kill_events_pids
 		wait $tests_pid
 	fi
+
+	# userspace pm remove initial subflow
+	if reset_with_events "userspace pm remove initial subflow" &&
+	   continue_if mptcp_lib_has_file '/proc/sys/net/mptcp/pm_type'; then
+		set_userspace_pm $ns2
+		pm_nl_set_limits $ns1 0 1
+		speed=10 \
+			run_tests $ns1 $ns2 10.0.1.1 &
+		local tests_pid=$!
+		wait_mpj $ns2
+		userspace_pm_add_sf $ns2 10.0.3.2 20
+		chk_join_nr 1 1 1
+		chk_mptcp_info subflows 1 subflows 1
+		chk_subflows_total 2 2
+		userspace_pm_rm_sf $ns2 10.0.1.2
+		# we don't look at the counter linked to the RM_ADDR but
+		# to the one linked to the subflows that have been removed
+		chk_rm_nr 0 1
+		chk_rst_nr 0 0 invert
+		chk_mptcp_info subflows 1 subflows 1
+		# No subflow removed in ns1, one
+		# subflow has been removed in ns2
+		chk_subflows_total 2 1
+		kill_events_pids
+		wait $tests_pid
+	fi
 }
 
 endpoint_tests()
-- 
2.35.3

[PATCH mptcp-next v15 5/7] mptcp: userspace pm send RM_ADDR for ID 0

[Geliang Tang]

This patch adds the ability to send RM_ADDR for local ID 0. Check
whether id 0 address is removed, if not, put id 0 into a removing
list, pass it to mptcp_pm_remove_addr() to remove id 0 address.

There is no reason not to allow the userspace to remove the initial
address (ID 0). This special case was not taken into account not
letting the userspace to delete all addresses as announced.

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/379
Fixes: d9a4594edabf ("mptcp: netlink: Add MPTCP_PM_CMD_REMOVE")
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
 net/mptcp/pm_userspace.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c
index 6b8083650bc1..ea50e694125d 100644
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -211,6 +211,40 @@ int mptcp_pm_nl_announce_doit(struct sk_buff *skb, struct genl_info *info)
 	return err;
 }
 
+static int mptcp_userspace_remove_id_zero_address(struct mptcp_sock *msk,
+						  struct genl_info *info)
+{
+	struct mptcp_rm_list list = { .nr = 0 };
+	struct mptcp_subflow_context *subflow;
+	struct sock *sk = (struct sock *)msk;
+	bool has_id_0 = false;
+	int err = -EINVAL;
+
+	lock_sock(sk);
+	mptcp_for_each_subflow(msk, subflow) {
+		if (subflow->local_id == 0) {
+			has_id_0 = true;
+			break;
+		}
+	}
+	if (!has_id_0) {
+		GENL_SET_ERR_MSG(info, "address with id 0 not found");
+		goto remove_err;
+	}
+
+	list.ids[list.nr++] = 0;
+
+	spin_lock_bh(&msk->pm.lock);
+	mptcp_pm_remove_addr(msk, &list);
+	spin_unlock_bh(&msk->pm.lock);
+
+	err = 0;
+
+remove_err:
+	release_sock(sk);
+	return err;
+}
+
 int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info)
 {
 	struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
@@ -245,6 +279,11 @@ int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info)
 		goto remove_err;
 	}
 
+	if (id_val == 0) {
+		err = mptcp_userspace_remove_id_zero_address(msk, info);
+		goto remove_err;
+	}
+
 	lock_sock(sk);
 
 	list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) {
-- 
2.35.3

[PATCH mptcp-next v15 6/7] mptcp: userspace pm rename remove_err to out

[Geliang Tang]

The value of 'err' will be not only '-EINVAL', but alse '0' most of the
time. So it's better to rename the lable 'remove_err' to 'out'.

Suggested-by: Matthieu Baerts <matttbe@kernel.org>
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
 net/mptcp/pm_userspace.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/mptcp/pm_userspace.c b/net/mptcp/pm_userspace.c
index ea50e694125d..cdff3e631d2d 100644
--- a/net/mptcp/pm_userspace.c
+++ b/net/mptcp/pm_userspace.c
@@ -276,12 +276,12 @@ int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info)
 
 	if (!mptcp_pm_is_userspace(msk)) {
 		GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
-		goto remove_err;
+		goto out;
 	}
 
 	if (id_val == 0) {
 		err = mptcp_userspace_remove_id_zero_address(msk, info);
-		goto remove_err;
+		goto out;
 	}
 
 	lock_sock(sk);
@@ -296,7 +296,7 @@ int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info)
 	if (!match) {
 		GENL_SET_ERR_MSG(info, "address with specified id not found");
 		release_sock(sk);
-		goto remove_err;
+		goto out;
 	}
 
 	list_move(&match->list, &free_list);
@@ -310,7 +310,7 @@ int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info)
 	}
 
 	err = 0;
- remove_err:
+out:
 	sock_put(sk);
 	return err;
 }
-- 
2.35.3

[PATCH mptcp-next v15 7/7] selftests: mptcp: userspace pm send RM_ADDR for ID 0

[Geliang Tang]

This patch adds a selftest for userpsace PM to remove id 0 address.
Use userspace_pm_add_addr() helper to add a id 10 address, then use
userspace_pm_rm_addr() helper to remove id 0 address.

Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
 .../testing/selftests/net/mptcp/mptcp_join.sh | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index 154978481409..0ef6499e7539 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -3533,6 +3533,35 @@ userspace_tests()
 		kill_events_pids
 		wait $tests_pid
 	fi
+
+	# userspace pm send RM_ADDR for ID 0
+	if reset_with_events "userspace pm send RM_ADDR for ID 0" &&
+	   continue_if mptcp_lib_has_file '/proc/sys/net/mptcp/pm_type'; then
+		set_userspace_pm $ns1
+		pm_nl_set_limits $ns2 1 1
+		speed=10 \
+			run_tests $ns1 $ns2 10.0.1.1 &
+		local tests_pid=$!
+		wait_mpj $ns1
+		userspace_pm_add_addr $ns1 10.0.2.1 10
+		chk_join_nr 1 1 1
+		chk_add_nr 1 1
+		chk_mptcp_info subflows 1 subflows 1
+		chk_subflows_total 2 2
+		chk_mptcp_info add_addr_signal 1 add_addr_accepted 1
+		userspace_pm_rm_addr $ns1 0
+		wait_rm_addr $ns2 1
+		# we don't look at the counter linked to the subflows that
+		# have been removed but to the one linked to the RM_ADDR
+		chk_rm_nr 1 0 invert
+		chk_rst_nr 0 0 invert
+		chk_mptcp_info subflows 1 subflows 1
+		# No subflow removed in ns1, one
+		# subflow has been removed in ns2
+		chk_subflows_total 2 1
+		kill_events_pids
+		wait $tests_pid
+	fi
 }
 
 endpoint_tests()
-- 
2.35.3

Re: selftests: mptcp: userspace pm send RM_ADDR for ID 0: Tests Results

[MPTCP CI]

Hi Geliang,

Thank you for your modifications, that's great!

Our CI did some validations and here is its report:

- KVM Validation: normal (except selftest_mptcp_join):
  - Success! ✅:
  - Task: https://cirrus-ci.com/task/6202261332819968
  - Summary: https://api.cirrus-ci.com/v1/artifact/task/6202261332819968/summary/summary.txt

- KVM Validation: normal (only selftest_mptcp_join):
  - Unstable: 1 failed test(s): selftest_mptcp_join 🔴:
  - Task: https://cirrus-ci.com/task/4794886449266688
  - Summary: https://api.cirrus-ci.com/v1/artifact/task/4794886449266688/summary/summary.txt

- KVM Validation: debug (only selftest_mptcp_join):
  - Unstable: 1 failed test(s): selftest_mptcp_join 🔴:
  - Task: https://cirrus-ci.com/task/5223938112880640
  - Summary: https://api.cirrus-ci.com/v1/artifact/task/5223938112880640/summary/summary.txt

- KVM Validation: debug (except selftest_mptcp_join):
  - Success! ✅:
  - Task: https://cirrus-ci.com/task/5920786356109312
  - Summary: https://api.cirrus-ci.com/v1/artifact/task/5920786356109312/summary/summary.txt

Initiator: Patchew Applier
Commits: https://github.com/multipath-tcp/mptcp_net-next/commits/216ab3a32b79


If there are some issues, you can reproduce them using the same environment as
the one used by the CI thanks to a docker image, e.g.:

    $ cd [kernel source code]
    $ docker run -v "${PWD}:${PWD}:rw" -w "${PWD}" --privileged --rm -it \
        --pull always mptcp/mptcp-upstream-virtme-docker:latest \
        auto-debug

For more details:

    https://github.com/multipath-tcp/mptcp-upstream-virtme-docker


Please note that despite all the efforts that have been already done to have a
stable tests suite when executed on a public CI like here, it is possible some
reported issues are not due to your modifications. Still, do not hesitate to
help us improve that ;-)

Cheers,
MPTCP GH Action bot
Bot operated by Matthieu Baerts (Tessares)

Re: [PATCH mptcp-next v15 4/7] selftests: mptcp: userspace pm remove initial subflow

[Matthieu Baerts]

Hi Geliang,

On 12/10/2023 10:52, Geliang Tang wrote:
> This patch adds a selftest for userpsace PM to remove the initial
> subflow. Use userspace_pm_add_sf() to add a subflow, and pass initial
> ip address to userspace_pm_rm_sf() to remove the initial subflow.
> 
> Signed-off-by: Geliang Tang <geliang.tang@suse.com>
> ---
>  .../testing/selftests/net/mptcp/mptcp_join.sh | 26 +++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
> index ab6908b7b143..154978481409 100755
> --- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
> +++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
> @@ -3507,6 +3507,32 @@ userspace_tests()
>  		kill_events_pids
>  		wait $tests_pid
>  	fi
> +
> +	# userspace pm remove initial subflow
> +	if reset_with_events "userspace pm remove initial subflow" &&
> +	   continue_if mptcp_lib_has_file '/proc/sys/net/mptcp/pm_type'; then
> +		set_userspace_pm $ns2
> +		pm_nl_set_limits $ns1 0 1
> +		speed=10 \
> +			run_tests $ns1 $ns2 10.0.1.1 &
> +		local tests_pid=$!
> +		wait_mpj $ns2
> +		userspace_pm_add_sf $ns2 10.0.3.2 20
> +		chk_join_nr 1 1 1
> +		chk_mptcp_info subflows 1 subflows 1
> +		chk_subflows_total 2 2
> +		userspace_pm_rm_sf $ns2 10.0.1.2
> +		# we don't look at the counter linked to the RM_ADDR but
> +		# to the one linked to the subflows that have been removed
> +		chk_rm_nr 0 1
> +		chk_rst_nr 0 0 invert
> +		chk_mptcp_info subflows 1 subflows 1
> +		# No subflow removed in ns1, one
> +		# subflow has been removed in ns2
> +		chk_subflows_total 2 1

We should really have "1 1" here: on both the client and the server
side, the initial subflow is being closed, so we should only have one
counter. Same comment on patch 7/7.

Maybe my suggestion from patch 3/7 will fix this issue.

Also, how are you checking this locally: with and without SS supporting
'subflows_total' counter?

Please note that the CI complained about these two tests (and the 2
others I mentioned before with 'subflows_total'). I suspect that you
also need to modify "chk_subflows_total()" and use 'state established'
filter for ss:

  ss -N (...) -ti state established

No?

Cheers,
Matt

> +		kill_events_pids
> +		wait $tests_pid
> +	fi
>  }
>  
>  endpoint_tests()

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Re: [PATCH mptcp-next v15 1/7] selftests: mptcp: join: no RST when rm subflow/addr

[Matthieu Baerts]

Hi Geliang,

On 12/10/2023 10:51, Geliang Tang wrote:
> From: Matthieu Baerts <matttbe@kernel.org>
> 
> Recently, we noticed that some RST were wrongly generated when removing
> the initial subflow.
> 
> This patch makes sure RST are not sent when removing any subflows or any
> addresses.

(...)

> diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
> index 01480663c102..ab6908b7b143 100755
> --- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
> +++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh

(...)

> @@ -2494,6 +2505,7 @@ remove_tests()
>  			run_tests $ns1 $ns2 10.0.1.1
>  		chk_join_nr 1 1 1
>  		chk_rm_nr 1 1
> +		chk_rst_nr 0 0 ## TODO: currently failing, Geliang is working on a fix

In your next version (if any), please remove this TODO and the one below
and move this patch after "mptcp: add __mptcp_subflow_disconnect helper"

We can do that now that the issue has been fixed by this other patch.

>  	fi
>  
>  	# remove id 0 address
> @@ -2506,6 +2518,7 @@ remove_tests()
>  		chk_join_nr 1 1 1
>  		chk_add_nr 1 1
>  		chk_rm_nr 1 1 invert
> +		chk_rst_nr 0 0 invert ## TODO: currently failing, Geliang is working on a fix
>  	fi
>  }
>  

Cheers,
Matt
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www.tessares.net

Re: [PATCH mptcp-next v15 3/7] Squash to "mptcp: add mptcpi_subflows_total counter"

[Matthieu Baerts]

Hi Geliang,

Thank you for the new version!

On 12/10/2023 10:52, Geliang Tang wrote:
> When the socket shuts down, it's state is TCPF_FIN_WAIT2. Add this into

Good point, but is it not first TCP_FIN_WAIT1? (then FIN_WAIT2, etc.)

> __mptcp_has_initial_subflow.
> 
> Signed-off-by: Geliang Tang <geliang.tang@suse.com>
> ---
>  net/mptcp/protocol.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
> index 6508179e94a6..ccb97b747527 100644
> --- a/net/mptcp/protocol.h
> +++ b/net/mptcp/protocol.h
> @@ -1081,7 +1081,8 @@ static inline bool __mptcp_has_initial_subflow(const struct mptcp_sock *msk)
>  {
>  	struct sock *ssk = READ_ONCE(msk->first);
>  
> -	return ssk && inet_sk_state_load(ssk) != TCP_CLOSE;
> +	return ssk &&
> +	       !((1 << inet_sk_state_load(ssk)) & (TCPF_FIN_WAIT2 | TCPF_CLOSE));

I see that we decrement "msk->pm.subflows" when we start closing the
subflow. To be coherent with this counter -- and also because there are
more "close/closing" state, should we not have:

   inet_sk_state_load(ssk) != TCP_ESTABLISHED;

Cheers,
Matt
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