From patchwork Fri Jun 4 22:02:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zvi Effron X-Patchwork-Id: 12300853 X-Patchwork-Delegate: bpf@iogearbox.net 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,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=ham 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 133DBC4743C for ; Fri, 4 Jun 2021 22:04:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F03F9613F1 for ; Fri, 4 Jun 2021 22:04:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229930AbhFDWGG (ORCPT ); Fri, 4 Jun 2021 18:06:06 -0400 Received: from mail-pg1-f175.google.com ([209.85.215.175]:33667 "EHLO mail-pg1-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229746AbhFDWGF (ORCPT ); Fri, 4 Jun 2021 18:06:05 -0400 Received: by mail-pg1-f175.google.com with SMTP id i5so8966867pgm.0 for ; Fri, 04 Jun 2021 15:04:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=riotgames.com; s=riotgames; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=gE6JKqyNdruBi/cWEwhmI0B7uKKCxYgcBMMsx5i3xIY=; b=nkS7brFHysBKUX6whfIZ5GTpxgLGVMGLQ1vI7GInKFrJn7FgvFO/20o3UewyDtKpOG 9+f0/dxN/Y/Km7fysDFpKMX8nPmUxs+fiAC60mJ6mLMUIISEtL4Cz+9zKvf+aEKYAlXM 51XDVonWPWFRK6t/ynLWDK+tpjoHM7BbKhJK8= 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=gE6JKqyNdruBi/cWEwhmI0B7uKKCxYgcBMMsx5i3xIY=; b=RZn6Pl0AuXg9NLhEa7oTnmytgU7DaQ0p4iTmYYGHUMufbjWqe1vyXCLJvOZQcHOvIP V7dv2XS9UGiwuCGAl/Nlk+E29GzMUz9gN9/KJ0IuDyNjguAnWqG4QqxoW5T1D/2QhTsN QinmHY5ZqAIwpi8vUJT22Yd4m6b/vUdrDJmdsF4IInB8C+pjDnbgTi5vqTso3N5QyC9J 3Ts4nZ3Qo/07HVN2e/Jpj8XWtQHaesCH7ciTe1ZSG6VhRcQQib+sj6/9a/9ESYvx64bU YCowJjysy6qPUqpH/87sSInw7CoxHELGMUHVL+l1wn1ts8Gdswibkji0d/VYj7EPcGtZ eEag== X-Gm-Message-State: AOAM532Sb9tuGEQeR5xKs2Uy3/UxVGejpZJUqceK/BjfIpKxjLP+Qh98 CkJ0iLcT8oay6FNlJALJqrTdzQaOgmIdPw== X-Google-Smtp-Source: ABdhPJxcyE0cIrmx7UdnwtPxPT34JWJCZbPsKfoFzkClDFnKEwlVuYhNRNcRI8PCgTI6kqQMdtOikA== X-Received: by 2002:a63:dc03:: with SMTP id s3mr396932pgg.354.1622844183209; Fri, 04 Jun 2021 15:03:03 -0700 (PDT) Received: from ip-10-184-182-114.us-west-2.compute.internal (ec2-54-191-147-77.us-west-2.compute.amazonaws.com. [54.191.147.77]) by smtp.gmail.com with ESMTPSA id bo14sm5435374pjb.40.2021.06.04.15.03.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Jun 2021 15:03:02 -0700 (PDT) From: Zvi Effron To: bpf@vger.kernel.org Cc: Alexei Starovoitov , "David S. Miller" , Daniel Borkmann , Jesper Dangaard Brouer , Andrii Nakryiko , Maciej Fijalkowski , Martin KaFai Lau , Zvi Effron , Cody Haas , Lisa Watanabe Subject: [PATCH bpf-next v4 3/3] selftests/bpf: Add test for xdp_md context in BPF_PROG_TEST_RUN Date: Fri, 4 Jun 2021 22:02:35 +0000 Message-Id: <20210604220235.6758-4-zeffron@riotgames.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210604220235.6758-1-zeffron@riotgames.com> References: <20210604220235.6758-1-zeffron@riotgames.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Add a test for using xdp_md as a context to BPF_PROG_TEST_RUN for XDP programs. The test uses a BPF program that takes in a return value from XDP metadata, then reduces the size of the XDP metadata by 4 bytes. Test cases validate the possible failure cases for passing in invalid xdp_md contexts, that the return value is successfully passed in, and that the adjusted metadata is successfully copied out. Co-developed-by: Cody Haas Signed-off-by: Cody Haas Co-developed-by: Lisa Watanabe Signed-off-by: Lisa Watanabe Signed-off-by: Zvi Effron --- .../bpf/prog_tests/xdp_context_test_run.c | 114 ++++++++++++++++++ .../bpf/progs/test_xdp_context_test_run.c | 20 +++ 2 files changed, 134 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c create mode 100644 tools/testing/selftests/bpf/progs/test_xdp_context_test_run.c diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c b/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c new file mode 100644 index 000000000000..0dbdebbc66ce --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c @@ -0,0 +1,114 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include "test_xdp_context_test_run.skel.h" + +void test_xdp_context_test_run(void) +{ + struct test_xdp_context_test_run *skel = NULL; + char data[sizeof(pkt_v4) + sizeof(__u32)]; + char buf[128]; + char bad_ctx[sizeof(struct xdp_md)]; + struct xdp_md ctx_in, ctx_out; + DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts, + .data_in = &data, + .data_out = buf, + .data_size_in = sizeof(data), + .data_size_out = sizeof(buf), + .ctx_out = &ctx_out, + .ctx_size_out = sizeof(ctx_out), + .repeat = 1, + ); + int err, prog_fd; + + skel = test_xdp_context_test_run__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel")) + return; + prog_fd = bpf_program__fd(skel->progs._xdp_context); + + *(__u32 *)data = XDP_PASS; + *(struct ipv4_packet *)(data + sizeof(__u32)) = pkt_v4; + + memset(&ctx_in, 0, sizeof(ctx_in)); + opts.ctx_in = &ctx_in; + opts.ctx_size_in = sizeof(ctx_in); + + opts.ctx_in = &ctx_in; + opts.ctx_size_in = sizeof(ctx_in); + ctx_in.data_meta = 0; + ctx_in.data = sizeof(__u32); + ctx_in.data_end = ctx_in.data + sizeof(pkt_v4); + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_OK(err, "bpf_prog_test_run(test1)"); + ASSERT_EQ(opts.retval, XDP_PASS, "test1-retval"); + ASSERT_EQ(opts.data_size_out, sizeof(pkt_v4), "test1-datasize"); + ASSERT_EQ(opts.ctx_size_out, opts.ctx_size_in, "test1-ctxsize"); + ASSERT_EQ(ctx_out.data_meta, 0, "test1-datameta"); + ASSERT_EQ(ctx_out.data, ctx_out.data_meta, "test1-data"); + ASSERT_EQ(ctx_out.data_end, sizeof(pkt_v4), "test1-dataend"); + + /* Data past the end of the kernel's struct xdp_md must be 0 */ + bad_ctx[sizeof(bad_ctx) - 1] = 1; + opts.ctx_in = bad_ctx; + opts.ctx_size_in = sizeof(bad_ctx); + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test2-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test2)"); + + /* The egress cannot be specified */ + ctx_in.egress_ifindex = 1; + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test3-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test3)"); + + /* data_meta must reference the start of data */ + ctx_in.data_meta = sizeof(__u32); + ctx_in.data = ctx_in.data_meta; + ctx_in.data_end = ctx_in.data + sizeof(pkt_v4); + ctx_in.egress_ifindex = 0; + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test4-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test4)"); + + /* Metadata must be 32 bytes or smaller */ + ctx_in.data_meta = 0; + ctx_in.data = sizeof(__u32)*9; + ctx_in.data_end = ctx_in.data + sizeof(pkt_v4); + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test5-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test5)"); + + /* Metadata's size must be a multiple of 4 */ + ctx_in.data = 3; + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test6-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test6)"); + + /* Total size of data must match data_end - data_meta */ + ctx_in.data = 0; + ctx_in.data_end = sizeof(pkt_v4) - 4; + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test7-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test7)"); + + ctx_in.data_end = sizeof(pkt_v4) + 4; + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test8-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test8)"); + + /* RX queue cannot be specified without specifying an ingress */ + ctx_in.data_end = sizeof(pkt_v4); + ctx_in.ingress_ifindex = 0; + ctx_in.rx_queue_index = 1; + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test9-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test9)"); + + ctx_in.ingress_ifindex = 1; + ctx_in.rx_queue_index = 1; + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test10-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test10)"); + + test_xdp_context_test_run__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/test_xdp_context_test_run.c b/tools/testing/selftests/bpf/progs/test_xdp_context_test_run.c new file mode 100644 index 000000000000..56fd0995b67c --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_xdp_context_test_run.c @@ -0,0 +1,20 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include + +SEC("xdp") +int _xdp_context(struct xdp_md *xdp) +{ + void *data = (void *)(unsigned long)xdp->data; + __u32 *metadata = (void *)(unsigned long)xdp->data_meta; + __u32 ret; + + if (metadata + 1 > data) + return XDP_ABORTED; + ret = *metadata; + if (bpf_xdp_adjust_meta(xdp, 4)) + return XDP_ABORTED; + return ret; +} + +char _license[] SEC("license") = "GPL";