From patchwork Mon Apr 8 15:24:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yonghong Song X-Patchwork-Id: 13621278 Received: from 69-171-232-181.mail-mxout.facebook.com (69-171-232-181.mail-mxout.facebook.com [69.171.232.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ED95E13FD87 for ; Mon, 8 Apr 2024 15:24:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=69.171.232.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712589881; cv=none; b=DTWhCI8kv834jB0xEbkFa8n5/RKsn1fVaYYb67AKsQ2BV/HBO4gSr0mzutHHVn9M9cxC96NlteIPp4uxxk2pOb4OCeP4VcqCgRysgxquLTl618lgUlZeIyxtIZgLviZWKeyo5PUko0sXgB0bj+zRxil3dRZHscYnuOG6sWE+k9Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712589881; c=relaxed/simple; bh=fk0j/agTyJLumpn2w9huXLiY4yzlb7rKIYJVHXRTFI0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=KznkVKv1JnNL97lw+AhbasQ77qbG2rf1vY1YUdyUmhGFTyyzxGiSM5mnW6KXOa2fFFaZSQg4vhdsvnhB5MJmtUqH/PnQR/ERbQcPlWsW995D/jIMcL7DjGaaXRaVk8K3yhqyKRLyePsdOTp1iGnEmewHjE7r7qh0Z6peYAL7fUs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.dev; spf=fail smtp.mailfrom=linux.dev; arc=none smtp.client-ip=69.171.232.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=linux.dev Received: by devbig309.ftw3.facebook.com (Postfix, from userid 128203) id E41962C7DFC3; Mon, 8 Apr 2024 08:24:25 -0700 (PDT) From: Yonghong Song To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Jakub Sitnicki , John Fastabend , kernel-team@fb.com, Martin KaFai Lau Subject: [PATCH bpf-next v6 0/5] bpf: Add bpf_link support for sk_msg and sk_skb progs Date: Mon, 8 Apr 2024 08:24:25 -0700 Message-ID: <20240408152425.4160829-1-yonghong.song@linux.dev> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net One of our internal services started to use sk_msg program and currently it used existing prog attach/detach2 as demonstrated in selftests. But attach/detach of all other bpf programs are based on bpf_link. Consistent attach/detach APIs for all programs will make things easy to undersand and less error prone. So this patch added bpf_link support for BPF_PROG_TYPE_SK_MSG. Based on comments from previous RFC patch, I added BPF_PROG_TYPE_SK_SKB support as well as both program types have similar treatment w.r.t. bpf_link handling. For the patch series, patch 1 added kernel support. Patch 2 added libbpf support. Patch 3 added bpftool support and patches 4/5 added some new tests. Changelogs: v5 -> v6: - resolve libbpf conflict due to recent upstream change. - add a bpf_link_create() test. - some code refactoring for better code quality. v4 -> v5: - increase scope of mutex protection in link_release. - remove previous-leftover entry in libbpf.map. - make some code changes for better understanding. v3 -> v4: - use a single mutex lock to protect both attach/detach/update and release/fill_info/show_fdinfo. - simplify code for sock_map_link_lookup(). - fix a few bugs. - add more tests. v2 -> v3: - consolidate link types of sk_msg and sk_skb to a single link type BPF_PROG_TYPE_SOCKMAP. - fix bpf_link lifecycle issue. in v2, after bpf_link is attached, a subsequent prog_attach could change that bpf_link. this patch makes bpf_link having correct behavior such that it won't go away facing other prog/link attach for the same map and the same attach type. Yonghong Song (5): bpf: Add bpf_link support for sk_msg and sk_skb progs libbpf: Add bpf_link support for BPF_PROG_TYPE_SOCKMAP bpftool: Add link dump support for BPF_LINK_TYPE_SOCKMAP selftests/bpf: Refactor out helper functions for a few tests selftests/bpf: Add some tests with new bpf_program__attach_sockmap() APIs include/linux/bpf.h | 6 + include/linux/skmsg.h | 4 + include/uapi/linux/bpf.h | 5 + kernel/bpf/syscall.c | 4 + net/core/sock_map.c | 261 ++++++++++++++++-- tools/bpf/bpftool/link.c | 9 + tools/include/uapi/linux/bpf.h | 5 + tools/lib/bpf/libbpf.c | 7 + tools/lib/bpf/libbpf.h | 2 + tools/lib/bpf/libbpf.map | 1 + .../selftests/bpf/prog_tests/sockmap_basic.c | 171 +++++++++++- .../selftests/bpf/prog_tests/sockmap_listen.c | 38 +++ .../bpf/progs/test_skmsg_load_helpers.c | 27 +- .../bpf/progs/test_sockmap_pass_prog.c | 17 +- .../progs/test_sockmap_skb_verdict_attach.c | 2 +- 15 files changed, 524 insertions(+), 35 deletions(-)