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[34.145.139.141]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-660d5f883e2sm4360772d50.6.2026.06.04.12.42.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Jun 2026 12:42:29 -0700 (PDT) From: Willem de Bruijn To: netdev@vger.kernel.org Cc: davem@davemloft.net, kuba@kernel.org, edumazet@google.com, pabeni@redhat.com, horms@kernel.org, Willem de Bruijn Subject: [PATCH net-next v2 0/3] SO_TXTIME improvements Date: Thu, 4 Jun 2026 15:41:02 -0400 Message-ID: <20260604194221.3319080-1-willemdebruijn.kernel@gmail.com> X-Mailer: git-send-email 2.54.0.1032.g2f8565e1d1-goog Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Willem de Bruijn FQ targets monotonic timestamps as generated by the TCP stack. But SO_TXTIME was later added, which can send skbs with timestamps against other clocks. It is now possible to detect these through skb tstamp_type. Make FQ robust by converting these timestamps for use in FQ (patch 2). This also requires testing against out-of-bounds values. Prefer to do this at the source, when parsing SCM_TXTIME (patch 1). But, tests in the hot path are still needed, to handle BPF sources. Extend the so_txtime selftest to handle this new case (patch 3). Changes: see individual patches Previous versions: v1: https://lore.kernel.org/netdev/20260603190243.2789335-1-willemdebruijn.kernel@gmail.com/ Willem de Bruijn (3): net: ensure SCM_TXTIME delivery time is no older than system boot net_sched: sch_fq: convert skb->tstamp if not monotonic selftests: drv-net: extend so_txtime with FQ with other clocks net/core/sock.c | 32 +++++++++++++- net/sched/sch_fq.c | 43 ++++++++++++++++--- .../selftests/drivers/net/so_txtime.py | 18 ++++++-- 3 files changed, 83 insertions(+), 10 deletions(-) -- 2.54.0.1032.g2f8565e1d1-goog