From patchwork Sat Mar 18 05:31:36 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kui-Feng Lee X-Patchwork-Id: 13179661 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD035C74A5B for ; Sat, 18 Mar 2023 05:32:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229470AbjCRFcE (ORCPT ); Sat, 18 Mar 2023 01:32:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42300 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230077AbjCRFcD (ORCPT ); Sat, 18 Mar 2023 01:32:03 -0400 Received: from mx0a-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D8642410A6 for ; Fri, 17 Mar 2023 22:32:01 -0700 (PDT) Received: from pps.filterd (m0001303.ppops.net [127.0.0.1]) by m0001303.ppops.net (8.17.1.19/8.17.1.19) with ESMTP id 32I0F5ow025744 for ; Fri, 17 Mar 2023 22:32:01 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=meta.com; h=from : to : cc : subject : date : message-id : content-type : content-transfer-encoding : mime-version; s=s2048-2021-q4; bh=mS+o7GwRV6Ge3qsA4TElm/l6tRK+q2aAxoKXC2NH+qc=; b=D5gIaNL9ZFxt43wsTWEgADwbHxfA0vsgz8JE7eRvUd43kGFYG+X04aJg60JThVLJefKg fQEEpphrvS3lafqahNQzVM8A4ClW0d9pe8g/+eyHjdrs7hWEx5DgvF8Vg+LD4fiNTEbF L+P3FJ4xYI4qwitj4EorK1ANQU1/NzZ4jLfqrYZsdg4ZXPwpIdVLulR7X7mlsdiGAZtl cTDa2ldjFXMwwAFsea5jHaosXDtFfWpubC5b4Jzdf9kObgiZnFtdxhjKkooYuJbydrYw 6TpxmmBGbKAYGZ0aVLLSMFkctH0BsF4wHKq8kNzYLB67SFAPukK7098a4jPxKf4aAm1/ NQ== Received: from mail.thefacebook.com ([163.114.132.120]) by m0001303.ppops.net (PPS) with ESMTPS id 3pcndedug3-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 17 Mar 2023 22:32:00 -0700 Received: from twshared24004.14.frc2.facebook.com (2620:10d:c085:208::f) by mail.thefacebook.com (2620:10d:c085:11d::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.17; Fri, 17 Mar 2023 22:31:59 -0700 Received: by devbig931.frc1.facebook.com (Postfix, from userid 460691) id C6F4279EB00A; Fri, 17 Mar 2023 22:31:48 -0700 (PDT) From: Kui-Feng Lee To: , , , , , , CC: Kui-Feng Lee Subject: [PATCH bpf-next v8 0/8] Transit between BPF TCP congestion controls. Date: Fri, 17 Mar 2023 22:31:36 -0700 Message-ID: <20230318053144.1180301-1-kuifeng@meta.com> X-Mailer: git-send-email 2.34.1 X-FB-Internal: Safe X-Proofpoint-GUID: PIDpdsN5-hSXGQqIyZE1Nk_Z0KnBSRyw X-Proofpoint-ORIG-GUID: PIDpdsN5-hSXGQqIyZE1Nk_Z0KnBSRyw X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-03-18_02,2023-03-16_02,2023-02-09_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Major changes: - Create bpf_links in the kernel for BPF struct_ops to register and unregister it. - Enables switching between implementations of bpf-tcp-cc under a name instantly by replacing the backing struct_ops map of a bpf_link. Previously, BPF struct_ops didn't go off, as even when the user program creating it was terminated, none of these ever were pinned. For instance, the TCP congestion control subsystem indirectly maintains a reference count on the struct_ops of any registered BPF implemented algorithm. Thus, the algorithm won't be deactivated until someone deliberately unregisters it. For compatibility with other BPF programs, bpf_links have been created to work in coordination with struct_ops maps. This ensures that the registration and unregistration of these respective maps is carried out at the start and end of the bpf_link. We also faced complications when attempting to replace an existing TCP congestion control algorithm with a new implementation on the fly. A struct_ops map was used to register a TCP congestion control algorithm with a unique name. We had to either register the alternative implementation with a new name and move over or unregister the current one before being able to reregistration with the same name. To fix this problem, we can an option to migrate the registration of the algorithm from struct_ops maps to bpf_links. By modifying the backing map of a bpf_link, it suddenly becomes possible to replace an existing TCP congestion control algorithm with ease. --- The major differences from v7: - Use synchronize_rcu_mult(call_rcu, call_rcu_tasks) to replace synchronize_rcu() & synchronize_rcu_tasks(). - Call synchronize_rcu() in tcp_update_congestion_control(). - Handle -EBUSY in bpf_map__attach_struct_ops() to allow a struct_ops can be used to create links more than once. Include a test case. - Add old_map_fd to bpf_attr and handle BPF_F_REPLACE in bpf_struct_ops_map_link_update(). - Remove changes in bpf_dummy_struct_ops.c and add a check of .update function pointer of bpf_struct_ops. The major differences from v6: - Reword commit logs of the patch 1, 2, and 8. - Call syncrhonize_rcu_tasks() as well in bpf_struct_ops_map_free(). - Refactor bpf_struct_ops_map_free() so that bpf_struct_ops_map_alloc() can free a struct_ops without waiting for a RCU grace period. The major differences from v5: - Add a new step to bpf_object__load() to prepare vdata. - Accept BPF_F_REPLACE. - Check section IDs in find_struct_ops_map_by_offset() - Add a test case to check mixing w/ and w/o link struct_ops. - Add a test case of using struct_ops w/o link to update a link. - Improve bpf_link__detach_struct_ops() to handle the w/ link case. The major differences from v4: - Rebase. - Reorder patches and merge part 4 to part 2 of the v4. The major differences from v3: - Remove bpf_struct_ops_map_free_rcu(), and use synchronize_rcu(). - Improve the commit log of the part 1. - Before transitioning to the READY state, we conduct a value check to ensure that struct_ops can be successfully utilized and links created later. The major differences from v2: - Simplify states - Remove TOBEUNREG. - Rename UNREG to READY. - Stop using the refcnt of the kvalue of a struct_ops. Explicitly increase and decrease the refcount of struct_ops. - Prepare kernel vdata during the load phase of libbpf. The major differences from v1: - Added bpf_struct_ops_link to replace the previous union-based approach. - Added UNREG and TOBEUNREG to the state of bpf_struct_ops_map. - bpf_struct_ops_transit_state() maintains state transitions. - Fixed synchronization issue. - Prepare kernel vdata of struct_ops during the loading phase of bpf_object. - Merged previous patch 3 to patch 1. v7: https://lore.kernel.org/all/20230316023641.2092778-1-kuifeng@meta.com/ v6: https://lore.kernel.org/all/20230310043812.3087672-1-kuifeng@meta.com/ v5: https://lore.kernel.org/all/20230308005050.255859-1-kuifeng@meta.com/ v4: https://lore.kernel.org/all/20230307232913.576893-1-andrii@kernel.org/ v3: https://lore.kernel.org/all/20230303012122.852654-1-kuifeng@meta.com/ v2: https://lore.kernel.org/bpf/20230223011238.12313-1-kuifeng@meta.com/ v1: https://lore.kernel.org/bpf/20230214221718.503964-1-kuifeng@meta.com/ Kui-Feng Lee (8): bpf: Retire the struct_ops map kvalue->refcnt. net: Update an existing TCP congestion control algorithm. bpf: Create links for BPF struct_ops maps. libbpf: Create a bpf_link in bpf_map__attach_struct_ops(). bpf: Update the struct_ops of a bpf_link. libbpf: Update a bpf_link with another struct_ops. libbpf: Use .struct_ops.link section to indicate a struct_ops with a link. selftests/bpf: Test switching TCP Congestion Control algorithms. include/linux/bpf.h | 11 + include/net/tcp.h | 3 + include/uapi/linux/bpf.h | 33 ++- kernel/bpf/bpf_struct_ops.c | 252 +++++++++++++++--- kernel/bpf/syscall.c | 63 ++++- net/ipv4/bpf_tcp_ca.c | 14 +- net/ipv4/tcp_cong.c | 65 ++++- tools/include/uapi/linux/bpf.h | 33 ++- tools/lib/bpf/libbpf.c | 190 ++++++++++--- tools/lib/bpf/libbpf.h | 1 + tools/lib/bpf/libbpf.map | 1 + .../selftests/bpf/prog_tests/bpf_tcp_ca.c | 116 ++++++++ .../selftests/bpf/progs/tcp_ca_update.c | 80 ++++++ 13 files changed, 761 insertions(+), 101 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/tcp_ca_update.c