From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 B405D4431 for ; Wed, 15 Mar 2023 12:36:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 394D0C433EF; Wed, 15 Mar 2023 12:36:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678883818; bh=ONp2cR4MDoiAvgT71lLa+4PovnEWURkrUFh8PM9dmSI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1KpLo38pKvC4fFrDi1qoMbLVbtxLqKIDEyzkhea4Q32P0inyZw5zT4CNSQ7ObAGpa 9OAJSVQfmxQga1GX+vzE3t5l2zkT8/b89cCZ7+nS8LlPRzC/6SHhHd8tbI0KHwRvY5 uAhZ9vh36RLh7wcOYfk3kSi5P6wqovq42ZfEzvQQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Martin KaFai Lau Subject: [PATCH 6.1 142/143] Revert "bpf, test_run: fix &xdp_frame misplacement for LIVE_FRAMES" Date: Wed, 15 Mar 2023 13:13:48 +0100 Message-Id: <20230315115744.966148285@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230315115740.429574234@linuxfoundation.org> References: <20230315115740.429574234@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Martin KaFai Lau commit 181127fb76e62d06ab17a75fd610129688612343 upstream. This reverts commit 6c20822fada1b8adb77fa450d03a0d449686a4a9. build bot failed on arch with different cache line size: https://lore.kernel.org/bpf/50c35055-afa9-d01e-9a05-ea5351280e4f@intel.com/ Signed-off-by: Martin KaFai Lau Signed-off-by: Greg Kroah-Hartman --- net/bpf/test_run.c | 29 +++------------ tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c | 7 +-- 2 files changed, 9 insertions(+), 27 deletions(-) --- a/net/bpf/test_run.c +++ b/net/bpf/test_run.c @@ -97,11 +97,8 @@ reset: struct xdp_page_head { struct xdp_buff orig_ctx; struct xdp_buff ctx; - union { - /* ::data_hard_start starts here */ - DECLARE_FLEX_ARRAY(struct xdp_frame, frame); - DECLARE_FLEX_ARRAY(u8, data); - }; + struct xdp_frame frm; + u8 data[]; }; struct xdp_test_data { @@ -119,20 +116,6 @@ struct xdp_test_data { #define TEST_XDP_FRAME_SIZE (PAGE_SIZE - sizeof(struct xdp_page_head)) #define TEST_XDP_MAX_BATCH 256 -#if BITS_PER_LONG == 64 && PAGE_SIZE == SZ_4K -/* tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c:%MAX_PKT_SIZE - * must be updated accordingly when any of these changes, otherwise BPF - * selftests will fail. - */ -#ifdef __s390x__ -#define TEST_MAX_PKT_SIZE 3216 -#else -#define TEST_MAX_PKT_SIZE 3408 -#endif -static_assert(SKB_WITH_OVERHEAD(TEST_XDP_FRAME_SIZE - XDP_PACKET_HEADROOM) == - TEST_MAX_PKT_SIZE); -#endif - static void xdp_test_run_init_page(struct page *page, void *arg) { struct xdp_page_head *head = phys_to_virt(page_to_phys(page)); @@ -149,8 +132,8 @@ static void xdp_test_run_init_page(struc headroom -= meta_len; new_ctx = &head->ctx; - frm = head->frame; - data = head->data; + frm = &head->frm; + data = &head->data; memcpy(data + headroom, orig_ctx->data_meta, frm_len); xdp_init_buff(new_ctx, TEST_XDP_FRAME_SIZE, &xdp->rxq); @@ -240,7 +223,7 @@ static void reset_ctx(struct xdp_page_he head->ctx.data = head->orig_ctx.data; head->ctx.data_meta = head->orig_ctx.data_meta; head->ctx.data_end = head->orig_ctx.data_end; - xdp_update_frame_from_buff(&head->ctx, head->frame); + xdp_update_frame_from_buff(&head->ctx, &head->frm); } static int xdp_recv_frames(struct xdp_frame **frames, int nframes, @@ -302,7 +285,7 @@ static int xdp_test_run_batch(struct xdp head = phys_to_virt(page_to_phys(page)); reset_ctx(head); ctx = &head->ctx; - frm = head->frame; + frm = &head->frm; xdp->frame_cnt++; act = bpf_prog_run_xdp(prog, ctx); --- a/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c +++ b/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c @@ -63,13 +63,12 @@ static int attach_tc_prog(struct bpf_tc_ } /* The maximum permissible size is: PAGE_SIZE - sizeof(struct xdp_page_head) - - * SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) - XDP_PACKET_HEADROOM = - * 3408 bytes for 64-byte cacheline and 3216 for 256-byte one. + * sizeof(struct skb_shared_info) - XDP_PACKET_HEADROOM = 3368 bytes */ #if defined(__s390x__) -#define MAX_PKT_SIZE 3216 +#define MAX_PKT_SIZE 3176 #else -#define MAX_PKT_SIZE 3408 +#define MAX_PKT_SIZE 3368 #endif static void test_max_pkt_size(int fd) {