[{"id":3687853,"web_url":"http://patchwork.ozlabs.org/comment/3687853/","msgid":"","list_archive_url":null,"date":"2026-05-07T14:28:59","subject":"ACK: [SRU][N:linux-bluefield][PATCH v1 0/3] UBUNTU: SAUCE: ipv4:\n Provide a FIB flushing signal from nexthop removal functions","submitter":{"id":91694,"url":"http://patchwork.ozlabs.org/api/people/91694/","name":"Alessio Faina","email":"alessio.faina@canonical.com"},"content":"On Thu, May 07, 2026 at 02:20:15PM +0300, Stav Aviram wrote:\n> BugLink: https://bugs.launchpad.net/bugs/2151772\n> \n> SRU Justification:\n> \n> [IMPACT]\n> Fix a performance issue in the IPv4 routing table causing severe RTNL lock\n> contention which in some complicated deployments (multiple VXLAN interfaces,\n> 128K+ routes, 128K+ nexthops) causes systemd-networkd to fail to renew DHCP\n> addresses in time, which then makes those interfaces become unmanaged.\n> \n> [FIX]\n> The fixes optimize nexthop removal when an interface goes down by batching\n> FIB table flushing. Previously, for each nexthop being removed, the FIB table\n> was flushed to remove all routing table entries pointing to the nexthop being\n> removed. This flushing is a sequential walk of the entire FIB trie, and for N\n> nexthops being removed and R routes installed results in O(N x R) performance.\n> The fix postpones flushing until all nexthops are marked dead and then does a\n> single FIB flush to remove all affected routing entries. This improves the\n> performance to O(N + R).\n> Upstream patches being submitted here: https://lore.kernel.org/netdev/20260507075606.322405-1-cratiu@nvidia.com/T/#t\n> Those patches don't apply cleanly on 6.8 due to other missing functionality, dedicated 6.8. patches will be provided in this ticket.\n> \n> [TEST CASE]\n> Successfully built the adjusted upstream patches on linux-bluefield-6.8\n> master-next branch.\n> \n> [Regression Potential]\n> Low risk. The latest upstream patches don't apply cleanly on 6.8 due to\n> missing functionality, but the modifications to make the patches apply are\n> trivial and don't impact the logical flow of batching the cleanup.\n> \n> Cosmin Ratiu (3):\n> UBUNTU: SAUCE: ipv4: Provide a FIB flushing signal from nexthop\n> removal functions\n> UBUNTU: SAUCE: ipv4: Flush the FIB once on multiple nexthop removal\n> UBUNTU: SAUCE: ipv4: Add __must_check to nexthop removal functions\n> \n> net/ipv4/nexthop.c | 93 +++++++++++++++++++++++++++++-----------------\n> 1 file changed, 58 insertions(+), 35 deletions(-)\n> \n> -- \n> 2.38.1\n> \n> \n> -- \n> kernel-team mailing list\n> kernel-team@lists.ubuntu.com\n> https://lists.ubuntu.com/mailman/listinfo/kernel-team\n\nAcked-by: Alessio Faina ","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=X+nj9W7m;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; helo=lists.ubuntu.com;\n envelope-from=kernel-team-bounces@lists.ubuntu.com;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists.ubuntu.com (lists.ubuntu.com [185.125.189.65])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4gBF4Y02wPz1y04\n\tfor ; Fri, 08 May 2026 00:29:16 +1000 (AEST)","from localhost ([127.0.0.1] helo=lists.ubuntu.com)\n\tby lists.ubuntu.com with esmtp (Exim 4.86_2)\n\t(envelope-from )\n\tid 1wKzip-0003Ew-Td; Thu, 07 May 2026 14:29:04 +0000","from smtp-relay-internal-0.internal ([10.131.114.225]\n helo=smtp-relay-internal-0.canonical.com)\n by lists.ubuntu.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)\n (Exim 4.86_2) (envelope-from )\n id 1wKzio-0003En-Bh\n for kernel-team@lists.ubuntu.com; Thu, 07 May 2026 14:29:02 +0000","from mail-ej1-f69.google.com (mail-ej1-f69.google.com\n [209.85.218.69])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest\n SHA256)\n (No client certificate requested)\n by smtp-relay-internal-0.canonical.com (Postfix) with ESMTPS id 3F0533FBF2\n for ; Thu, 7 May 2026 14:29:02 +0000 (UTC)","by mail-ej1-f69.google.com with SMTP id\n a640c23a62f3a-b8704795d25so84590466b.2\n for ; Thu, 07 May 2026 07:29:02 -0700 (PDT)","from localhost (93-35-115-10.ip54.fastwebnet.it. 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Previously, for each nexthop being removed, the FIB table\n> was flushed to remove all routing table entries pointing to the nexthop being\n> removed. This flushing is a sequential walk of the entire FIB trie, and for N\n> nexthops being removed and R routes installed results in O(N x R) performance.\n> The fix postpones flushing until all nexthops are marked dead and then does a\n> single FIB flush to remove all affected routing entries. This improves the\n> performance to O(N + R).\n> Upstream patches being submitted here: https://lore.kernel.org/netdev/20260507075606.322405-1-cratiu@nvidia.com/T/#t\n> Those patches don't apply cleanly on 6.8 due to other missing functionality, dedicated 6.8. patches will be provided in this ticket.\n>\n> [TEST CASE]\n> Successfully built the adjusted upstream patches on linux-bluefield-6.8\n> master-next branch.\n>\n> [Regression Potential]\n> Low risk. The latest upstream patches don't apply cleanly on 6.8 due to\n> missing functionality, but the modifications to make the patches apply are\n> trivial and don't impact the logical flow of batching the cleanup.\n>\n> Cosmin Ratiu (3):\n> UBUNTU: SAUCE: ipv4: Provide a FIB flushing signal from nexthop\n> removal functions\n> UBUNTU: SAUCE: ipv4: Flush the FIB once on multiple nexthop removal\n> UBUNTU: SAUCE: ipv4: Add __must_check to nexthop removal functions\n>\n> net/ipv4/nexthop.c | 93 +++++++++++++++++++++++++++++-----------------\n> 1 file changed, 58 insertions(+), 35 deletions(-)\n>","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=BG7RqZ9w;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; 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boundary=\"===============4141314236487928574==\"","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "}},{"id":3687939,"web_url":"http://patchwork.ozlabs.org/comment/3687939/","msgid":"","list_archive_url":null,"date":"2026-05-07T17:02:46","subject":"APPLIED: [SRU][N:linux-bluefield][PATCH v1 0/3] UBUNTU: SAUCE: ipv4:\n Provide a FIB flushing signal from nexthop removal functions","submitter":{"id":91694,"url":"http://patchwork.ozlabs.org/api/people/91694/","name":"Alessio Faina","email":"alessio.faina@canonical.com"},"content":"On Thu, May 07, 2026 at 02:20:15PM +0300, Stav Aviram wrote:\n> BugLink: https://bugs.launchpad.net/bugs/2151772\n> \n> SRU Justification:\n> \n> [IMPACT]\n> Fix a performance issue in the IPv4 routing table causing severe RTNL lock\n> contention which in some complicated deployments (multiple VXLAN interfaces,\n> 128K+ routes, 128K+ nexthops) causes systemd-networkd to fail to renew DHCP\n> addresses in time, which then makes those interfaces become unmanaged.\n> \n> [FIX]\n> The fixes optimize nexthop removal when an interface goes down by batching\n> FIB table flushing. Previously, for each nexthop being removed, the FIB table\n> was flushed to remove all routing table entries pointing to the nexthop being\n> removed. This flushing is a sequential walk of the entire FIB trie, and for N\n> nexthops being removed and R routes installed results in O(N x R) performance.\n> The fix postpones flushing until all nexthops are marked dead and then does a\n> single FIB flush to remove all affected routing entries. This improves the\n> performance to O(N + R).\n> Upstream patches being submitted here: https://lore.kernel.org/netdev/20260507075606.322405-1-cratiu@nvidia.com/T/#t\n> Those patches don't apply cleanly on 6.8 due to other missing functionality, dedicated 6.8. patches will be provided in this ticket.\n> \n> [TEST CASE]\n> Successfully built the adjusted upstream patches on linux-bluefield-6.8\n> master-next branch.\n> \n> [Regression Potential]\n> Low risk. The latest upstream patches don't apply cleanly on 6.8 due to\n> missing functionality, but the modifications to make the patches apply are\n> trivial and don't impact the logical flow of batching the cleanup.\n> \n> Cosmin Ratiu (3):\n> UBUNTU: SAUCE: ipv4: Provide a FIB flushing signal from nexthop\n> removal functions\n> UBUNTU: SAUCE: ipv4: Flush the FIB once on multiple nexthop removal\n> UBUNTU: SAUCE: ipv4: Add __must_check to nexthop removal functions\n> \n> net/ipv4/nexthop.c | 93 +++++++++++++++++++++++++++++-----------------\n> 1 file changed, 58 insertions(+), 35 deletions(-)\n> \n> -- \n> 2.38.1\n> \n> \n> -- \n> kernel-team mailing list\n> kernel-team@lists.ubuntu.com\n> https://lists.ubuntu.com/mailman/listinfo/kernel-team\n\nApplied to n:linux-bluefield\n\nThanks!\n- Alessio Faina","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=YAgwlQLE;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; helo=lists.ubuntu.com;\n envelope-from=kernel-team-bounces@lists.ubuntu.com;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists.ubuntu.com (lists.ubuntu.com [185.125.189.65])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4gBJV2216tz1y04\n\tfor ; Fri, 08 May 2026 03:03:05 +1000 (AEST)","from localhost ([127.0.0.1] helo=lists.ubuntu.com)\n\tby lists.ubuntu.com with esmtp (Exim 4.86_2)\n\t(envelope-from )\n\tid 1wL27f-0006ra-01; Thu, 07 May 2026 17:02:51 +0000","from smtp-relay-internal-1.internal ([10.131.114.114]\n helo=smtp-relay-internal-1.canonical.com)\n by lists.ubuntu.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)\n (Exim 4.86_2) (envelope-from )\n id 1wL27e-0006rT-4c\n for kernel-team@lists.ubuntu.com; Thu, 07 May 2026 17:02:50 +0000","from mail-wm1-f72.google.com (mail-wm1-f72.google.com\n [209.85.128.72])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest\n SHA256)\n (No client certificate requested)\n by smtp-relay-internal-1.canonical.com (Postfix) with ESMTPS id BCB003F856\n for ; Thu, 7 May 2026 17:02:49 +0000 (UTC)","by mail-wm1-f72.google.com with SMTP id\n 5b1f17b1804b1-488ba2f4094so8217815e9.1\n for ; Thu, 07 May 2026 10:02:49 -0700 (PDT)","from localhost (93-35-115-10.ip54.fastwebnet.it. 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