From patchwork Mon Oct 2 23:47:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Vernet X-Patchwork-Id: 13406622 X-Patchwork-Delegate: bpf@iogearbox.net Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0A16B20B10 for ; Mon, 2 Oct 2023 23:47:15 +0000 (UTC) Received: from mail-pg1-f176.google.com (mail-pg1-f176.google.com [209.85.215.176]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 879EACC; Mon, 2 Oct 2023 16:47:14 -0700 (PDT) Received: by mail-pg1-f176.google.com with SMTP id 41be03b00d2f7-5859a7d6556so185881a12.0; Mon, 02 Oct 2023 16:47:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696290434; x=1696895234; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=/wzzKUe/S8MKLxWxB+dTpANkK30HpVTpho7RkzNp9HU=; b=JGZXPKN5C88bONLmHTu2b+WahjPJe/spGq8m56Xh9fBqJ6dl6qJs/yjQx2I9bXvVg1 TpRD8MfphdqbENu8Wdowr6LfPJxX33DN4Eduo7KOtECns27+DG4bSPozuCPV/ce6ICje jK2M2kkDuhXaYPiELQI6bpUFN8MpvbMT2Jr29d3/wQ2rMhGx8wCL1z/TQ+3RHnuKijyp /vaWt6to5pnIPkw3yzqdwcD8dZOhomdAfuv1fvjTS875WFI4ZWJ0n+TtVGRzl8BnC5cz tzPKCddwbvkSZq/+RCWYzXFoxMyGP/bRsU2LWjUjNwGuFlP544bfZSi6aMCJtH4xOC7p oBRA== X-Gm-Message-State: AOJu0YzpASAx7My8RFcUqO8CfJh+GfOs9aNpeZXrvUrj2VSfvYUg9K0O wp0sLnOPOablTTVirlnJhAaZBhva55bTFeH8 X-Google-Smtp-Source: AGHT+IH58b+uEONYiSLGbLsu12iNGiHLzw9r8xy2AVog41EIuRQumQ29v3ltTMSt9EecNREs3Shx6A== X-Received: by 2002:a05:6a20:9184:b0:153:8754:8a7e with SMTP id v4-20020a056a20918400b0015387548a7emr14828886pzd.3.1696290433610; Mon, 02 Oct 2023 16:47:13 -0700 (PDT) Received: from localhost ([2620:10d:c090:400::4:d0e0]) by smtp.gmail.com with ESMTPSA id g6-20020a170902740600b001b5656b0bf9sm13876pll.286.2023.10.02.16.47.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Oct 2023 16:47:13 -0700 (PDT) From: David Vernet To: bpf@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, himadrispandya@gmail.com, julia.lawall@inria.fr Subject: [PATCH bpf-next 2/2] bpf/selftests: Test pinning bpf timer to a core Date: Mon, 2 Oct 2023 18:47:08 -0500 Message-ID: <20231002234708.331192-2-void@manifault.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231002234708.331192-1-void@manifault.com> References: <20231002234708.331192-1-void@manifault.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: bpf@iogearbox.net Now that we support pinning a BPF timer to the current core, we should test it with some selftests. This patch adds two new testcases to the timer suite, which verifies that a BPF timer both with and without BPF_F_TIMER_ABS, can be pinned to the calling core with BPF_F_TIMER_CPU_PIN. Signed-off-by: David Vernet Acked-by: Song Liu --- .../testing/selftests/bpf/prog_tests/timer.c | 4 + tools/testing/selftests/bpf/progs/timer.c | 75 +++++++++++++++++++ 2 files changed, 79 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/timer.c b/tools/testing/selftests/bpf/prog_tests/timer.c index 290c21dbe65a..d8bc838445ec 100644 --- a/tools/testing/selftests/bpf/prog_tests/timer.c +++ b/tools/testing/selftests/bpf/prog_tests/timer.c @@ -14,6 +14,7 @@ static int timer(struct timer *timer_skel) ASSERT_EQ(timer_skel->data->callback_check, 52, "callback_check1"); ASSERT_EQ(timer_skel->data->callback2_check, 52, "callback2_check1"); + ASSERT_EQ(timer_skel->bss->pinned_callback_check, 0, "pinned_callback_check1"); prog_fd = bpf_program__fd(timer_skel->progs.test1); err = bpf_prog_test_run_opts(prog_fd, &topts); @@ -32,6 +33,9 @@ static int timer(struct timer *timer_skel) /* check that timer_cb3() was executed twice */ ASSERT_EQ(timer_skel->bss->abs_data, 12, "abs_data"); + /* check that timer_cb_pinned() was executed twice */ + ASSERT_EQ(timer_skel->bss->pinned_callback_check, 2, "pinned_callback_check"); + /* check that there were no errors in timer execution */ ASSERT_EQ(timer_skel->bss->err, 0, "err"); diff --git a/tools/testing/selftests/bpf/progs/timer.c b/tools/testing/selftests/bpf/progs/timer.c index 9a16d95213e1..0112b9c038b4 100644 --- a/tools/testing/selftests/bpf/progs/timer.c +++ b/tools/testing/selftests/bpf/progs/timer.c @@ -53,12 +53,28 @@ struct { __type(value, struct elem); } abs_timer SEC(".maps"); +struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __uint(max_entries, 1); + __type(key, int); + __type(value, struct elem); +} soft_timer_pinned SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __uint(max_entries, 1); + __type(key, int); + __type(value, struct elem); +} abs_timer_pinned SEC(".maps"); + __u64 bss_data; __u64 abs_data; __u64 err; __u64 ok; __u64 callback_check = 52; __u64 callback2_check = 52; +__u64 pinned_callback_check; +__s32 pinned_cpu; #define ARRAY 1 #define HTAB 2 @@ -329,3 +345,62 @@ int BPF_PROG2(test3, int, a) return 0; } + +/* callback for pinned timer */ +static int timer_cb_pinned(void *map, int *key, struct bpf_timer *timer) +{ + __s32 cpu = bpf_get_smp_processor_id(); + + if (cpu != pinned_cpu) + err |= 16384; + + pinned_callback_check++; + return 0; +} + +static void test_pinned_timer(bool soft) +{ + int key = 0; + void *map; + struct bpf_timer *timer; + __u64 flags = BPF_F_TIMER_CPU_PIN; + __u64 start_time; + + if (soft) { + map = &soft_timer_pinned; + start_time = 0; + } else { + map = &abs_timer_pinned; + start_time = bpf_ktime_get_boot_ns(); + flags |= BPF_F_TIMER_ABS; + } + + timer = bpf_map_lookup_elem(map, &key); + if (timer) { + if (bpf_timer_init(timer, map, CLOCK_BOOTTIME) != 0) + err |= 4096; + bpf_timer_set_callback(timer, timer_cb_pinned); + pinned_cpu = bpf_get_smp_processor_id(); + bpf_timer_start(timer, start_time + 1000, flags); + } else { + err |= 8192; + } +} + +SEC("fentry/bpf_fentry_test4") +int BPF_PROG2(test4, int, a) +{ + bpf_printk("test4"); + test_pinned_timer(true); + + return 0; +} + +SEC("fentry/bpf_fentry_test5") +int BPF_PROG2(test5, int, a) +{ + bpf_printk("test5"); + test_pinned_timer(false); + + return 0; +}