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[188.141.5.72]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4411c9f4f03sm8975225f8f.1.2026.04.21.08.22.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Apr 2026 08:22:20 -0700 (PDT) From: David Carlier To: netdev@vger.kernel.org, mptcp@lists.linux.dev Cc: matttbe@kernel.org, martineau@kernel.org, geliang@kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, David Carlier Subject: [PATCH 0/3] mptcp: add RECVERR and MSG_ERRQUEUE support Date: Tue, 21 Apr 2026 16:22:08 +0100 Message-ID: <20260421152216.38127-1-devnexen@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit MPTCP already advertises IP_RECVERR/IPV6_RECVERR as supported, but the parent socket does not currently provide usable MSG_ERRQUEUE handling. This series wires the MPTCP socket up to the IPv4/IPv6 error queue paths. It propagates RECVERR-related sockopts to existing and future subflows, makes poll() report pending errqueue activity through the parent socket, and allows recvmsg(MSG_ERRQUEUE) on the MPTCP socket to consume queued errors with the parent socket ABI. The series also handles mixed-family subflows by applying the matching sockopt according to each subflow family, and avoids silently losing an error skb if requeueing to the parent socket fails under rmem pressure. Patch 1 propagates the RECVERR sockopts to subflows. Patch 2 implements parent-socket MSG_ERRQUEUE handling and poll() reporting. Patch 3 adds selftest coverage for RECVERR sockopt round-trips and timestamping-driven MSG_ERRQUEUE delivery on the MPTCP parent socket. Testing: - make -C tools/testing/selftests/net/mptcp mptcp_sockopt - git diff --check David Carlier (3): mptcp: propagate RECVERR sockopts to subflows mptcp: support MSG_ERRQUEUE on the parent socket selftests: mptcp: cover RECVERR and MSG_ERRQUEUE net/mptcp/protocol.c | 121 +++++++++++--- net/mptcp/sockopt.c | 125 ++++++++++++++ .../selftests/net/mptcp/mptcp_sockopt.c | 152 ++++++++++++++++++ 3 files changed, 380 insertions(+), 18 deletions(-) -- 2.53.0