From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39C19C433DB for ; Tue, 16 Feb 2021 11:00:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E628564DE0 for ; Tue, 16 Feb 2021 11:00:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230031AbhBPLAE (ORCPT ); Tue, 16 Feb 2021 06:00:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34956 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229662AbhBPK7v (ORCPT ); Tue, 16 Feb 2021 05:59:51 -0500 Received: from mail-wr1-x42a.google.com (mail-wr1-x42a.google.com [IPv6:2a00:1450:4864:20::42a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C06AFC061788 for ; Tue, 16 Feb 2021 02:58:18 -0800 (PST) Received: by mail-wr1-x42a.google.com with SMTP id v7so12337016wrr.12 for ; Tue, 16 Feb 2021 02:58:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloudflare.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=i2yCinIxoFBwLow1XBzdxruWNWA8TGQLQmqlS/4jbqc=; b=FmEdQ8d8GxPQx369N6ZOkR3BwvDEXImJV05u2dufOfs9WfqKyH9pm9y2zG6W1L1i6J g38eklpk2UJntpaKyYcczEbS0at70uRxtTNOY0DQGAmA9ep/II3tARqWvGtAUC3y6Kfc GzkLh5MOkcjWyqKaTubz9OSpWPlzJq3BbrpyE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=i2yCinIxoFBwLow1XBzdxruWNWA8TGQLQmqlS/4jbqc=; b=SMuxey8eKw+zhevULak/j6Aabl2K41YA1+migMpwBsYQbn4cSrxmaU6XG2gef0gRjI b1VI8Hn6q0ynYLCq8RIqDigG3MHx28i05v1lL99qkoA/6KDxP9U7JKjBPsgrBpJopp7h 5XmEbAXCox1YnhYElxVnykf0uxULHkdv6cnRDl9oBxZmk7oHBF9qVKcFyU5QthP5dn+P Vp9/9+erWpjkRZKe6EGtIABSLn7dYROqbMCGAwwY25MuNsAn1tXumyo1UUwiy3KmUQOJ wDFIXhbW83qguSlu2UIRHzUJjffBxtX57Z4DPnc6vucr7L0XssUCWxdDKn4UF1L/6aAm wHYA== X-Gm-Message-State: AOAM532uqLLRVwauoBxPw2gcAnvmUFKL3hsav41ndPIUsSCT6/4TNa6g ZG5TiH3dXdhq3/Z5GxEBQoPZaw== X-Google-Smtp-Source: ABdhPJxg8Srplv+YucwvNv1NCoeTVROtLTTL5owoswv45Q2dRu+KjoCT/2o2Ej7i1B1BSepK/WJeUQ== X-Received: by 2002:adf:ee84:: with SMTP id b4mr22799029wro.339.1613473097526; Tue, 16 Feb 2021 02:58:17 -0800 (PST) Received: from antares.lan (111.253.187.81.in-addr.arpa. [81.187.253.111]) by smtp.gmail.com with ESMTPSA id l1sm2820238wmi.48.2021.02.16.02.58.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Feb 2021 02:58:17 -0800 (PST) From: Lorenz Bauer To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, jakub@cloudflare.com Cc: kernel-team@cloudflare.com, bpf@vger.kernel.org, netdev@vger.kernel.org, Lorenz Bauer Subject: [PATCH bpf-next 2/8] bpf: add for_each_bpf_prog helper Date: Tue, 16 Feb 2021 10:57:07 +0000 Message-Id: <20210216105713.45052-3-lmb@cloudflare.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210216105713.45052-1-lmb@cloudflare.com> References: <20210216105713.45052-1-lmb@cloudflare.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Add a helper to iterate bpf_prog_arrays, which are a hybrid between and array and a linked list. Hide this behind a for each macro. Signed-off-by: Lorenz Bauer --- include/linux/bpf.h | 11 +++++------ include/linux/filter.h | 4 +--- 2 files changed, 6 insertions(+), 9 deletions(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index cccaef1088ea..875f6bc4bf1d 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1070,6 +1070,9 @@ int bpf_prog_array_copy(struct bpf_prog_array *old_array, /* BPF program asks to set CN on the packet. */ #define BPF_RET_SET_CN (1 << 0) +#define for_each_bpf_prog(_array, _item, _prog) \ + for ((_item) = &(_array)->items[0]; ((_prog) = READ_ONCE((_item)->prog)); (_item)++) + #define BPF_PROG_RUN_ARRAY_FLAGS(array, ctx, func, ret_flags) \ ({ \ struct bpf_prog_array_item *_item; \ @@ -1080,13 +1083,11 @@ int bpf_prog_array_copy(struct bpf_prog_array *old_array, migrate_disable(); \ rcu_read_lock(); \ _array = rcu_dereference(array); \ - _item = &_array->items[0]; \ - while ((_prog = READ_ONCE(_item->prog))) { \ + for_each_bpf_prog(_array, _item, _prog) { \ bpf_cgroup_storage_set(_item->cgroup_storage); \ func_ret = func(_prog, ctx); \ _ret &= (func_ret & 1); \ *(ret_flags) |= (func_ret >> 1); \ - _item++; \ } \ rcu_read_unlock(); \ migrate_enable(); \ @@ -1104,11 +1105,9 @@ int bpf_prog_array_copy(struct bpf_prog_array *old_array, _array = rcu_dereference(array); \ if (unlikely(check_non_null && !_array))\ goto _out; \ - _item = &_array->items[0]; \ - while ((_prog = READ_ONCE(_item->prog))) { \ + for_each_bpf_prog(_array, _item, _prog) { \ bpf_cgroup_storage_set(_item->cgroup_storage); \ _ret &= func(_prog, ctx); \ - _item++; \ } \ _out: \ rcu_read_unlock(); \ diff --git a/include/linux/filter.h b/include/linux/filter.h index 3b00fc906ccd..9ed20ff29d9a 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -1376,8 +1376,7 @@ extern struct static_key_false bpf_sk_lookup_enabled; u32 _ret; \ \ migrate_disable(); \ - _item = &(array)->items[0]; \ - while ((_prog = READ_ONCE(_item->prog))) { \ + for_each_bpf_prog(array, _item, _prog) { \ /* restore most recent selection */ \ _ctx->selected_sk = _selected_sk; \ _ctx->no_reuseport = _no_reuseport; \ @@ -1390,7 +1389,6 @@ extern struct static_key_false bpf_sk_lookup_enabled; } else if (_ret == SK_DROP && _all_pass) { \ _all_pass = false; \ } \ - _item++; \ } \ _ctx->selected_sk = _selected_sk; \ _ctx->no_reuseport = _no_reuseport; \ -- 2.27.0