From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 161D43E5EDA; Fri, 22 May 2026 11:32:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779449567; cv=none; b=J7lpTzXVaqLOwkPaywwdZ9ghbeOFWyVDqrV/oE4xMtv+jSZfi/wgfCKqnwtYdFhTdPOhhba56vG665pK4y9nvcPKlsonnb90ZE0Rpu73qZhjxYvNf5JQ8O7sAb5o0Z8Y86xLOUGGcH7kx2B/dhtbNVxXFDnpjS/PDoo4Mqffntw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779449567; c=relaxed/simple; bh=R1KMAI23+7i1Wc6O1oXgl53R9JvNI3FJ8hKBnXBkFx0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=tW8RzPOL9TLkYczXM+48GiHYUvlBqUD0LfxnQHott4OPzKjjWlKk1R4Gv5936BSPIKdaKwSKlTuL3rL97ZpE0IlzG/rMzrGtNyYUahGqTzIEgMK+VOKahJ6JO6wEmGlPgHOax6r4LtyidjROb5RbhMHXFat2/YJrg6WRz2Zq5KE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Xstujc3T; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Xstujc3T" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B74451F000E9; Fri, 22 May 2026 11:32:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779449565; bh=FA0JT2MU1cjq+IOgE1QiCa+xKqbwI7TFJcp+fEW0hS0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Xstujc3TsCHLHgbRC/WvNwHYPcgN/PSk36AA87VL0Rsvsp4wx4sJ55AaVTr29sb4T 8KduXT1yFtgS2ysVH+wgWqYzPRPA/1wvpi+eXpMu6oxOPLLvoLJ+gFWEJHDdoK83YE gO4/HHM/L2ZYYhBrPG4qkbEUUCcaUx77UKPKZ1aoY0cr/QvGNesNDS7lXDvUCyb5ah v3SldAS8hyB8M/3IGNbbUtnmPiaBjDjkn5PZR+jMSbjxRQhEBkNBzs/wVMzAUzPxUI a+U3zqpSFFUmv+4h6aXuJ9F9V/zIG9AVGsZ9B/O7yrgHnphGjAcxRKbtwkGh7zH51X vjYHZ2vioPCkQ== From: =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= To: Alexander Duyck , Jakub Kicinski , kernel-team@meta.com, Andrew Lunn , "David S. Miller" , Eric Dumazet , Paolo Abeni , Shuah Khan , netdev@vger.kernel.org Cc: =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , Jacob Keller , Mohsin Bashir , "Mike Marciniszyn (Meta)" , Pavel Begunkov , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH net-next 3/3] selftests: drv-net: Add zcrx payload offset check Date: Fri, 22 May 2026 13:32:22 +0200 Message-ID: <20260522113225.241337-4-bjorn@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260522113225.241337-1-bjorn@kernel.org> References: <20260522113225.241337-1-bjorn@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add an optional iou-zcrx receiver check for payload CQE offsets. With -F, the receiver fails if no zero-copy receive CQE lands at or beyond the requested offset within an rx_buf_len-sized buffer. This is useful for manual driver testing where the driver is expected to split a larger zcrx buffer into smaller hardware receive fragments. Do not wire it into the generic large-chunk test, since different drivers may legitimately return different CQE boundaries. Signed-off-by: Björn Töpel --- .../selftests/drivers/net/hw/iou-zcrx.c | 28 +++++++++++++++++-- 1 file changed, 25 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/drivers/net/hw/iou-zcrx.c b/tools/testing/selftests/drivers/net/hw/iou-zcrx.c index 240d13dbc54e..0fb0410aaada 100644 --- a/tools/testing/selftests/drivers/net/hw/iou-zcrx.c +++ b/tools/testing/selftests/drivers/net/hw/iou-zcrx.c @@ -85,6 +85,8 @@ static int cfg_send_size = SEND_SIZE; static struct sockaddr_in6 cfg_addr; static unsigned int cfg_rx_buf_len; static bool cfg_dry_run; +static bool cfg_check_payload_offset, cfg_seen_payload_offset; +static unsigned int cfg_min_payload_offset; static char *payload; static void *area_ptr; @@ -298,6 +300,13 @@ static void process_recvzc(struct io_uring *ring, struct io_uring_cqe *cqe) mask = (1ULL << IORING_ZCRX_AREA_SHIFT) - 1; data = (char *)area_ptr + (rcqe->off & mask); + if (cfg_check_payload_offset) { + unsigned int rx_buf_len = cfg_rx_buf_len ?: page_size; + + if ((rcqe->off & mask) % rx_buf_len >= cfg_min_payload_offset) + cfg_seen_payload_offset = true; + } + for (i = 0; i < n; i++) { if (*(data + i) != payload[(received + i)]) error(1, 0, "payload mismatch at %d", i); @@ -374,6 +383,9 @@ static void run_server(void) if (!stop) error(1, 0, "test failed\n"); + if (cfg_check_payload_offset && !cfg_seen_payload_offset) + error(1, 0, "no payload CQE at offset >= %u\n", + cfg_min_payload_offset); } static void run_client(void) @@ -406,8 +418,11 @@ static void run_client(void) static void usage(const char *filepath) { - error(1, 0, "Usage: %s (-4|-6) (-s|-c) -h -p " - "-l -i -q", filepath); + error(1, 0, + "Usage: %s (-4|-6) (-s|-c) -h -p\n" + "\t-l -i -q\n" + "\t[-x] [-F] [-d]\n", + filepath); } static void parse_opts(int argc, char **argv) @@ -425,7 +440,7 @@ static void parse_opts(int argc, char **argv) usage(argv[0]); cfg_payload_len = max_payload_len; - while ((c = getopt(argc, argv, "sch:p:l:i:q:o:z:x:d")) != -1) { + while ((c = getopt(argc, argv, "sch:p:l:i:q:o:z:x:F:d")) != -1) { switch (c) { case 's': if (cfg_client) @@ -463,6 +478,10 @@ static void parse_opts(int argc, char **argv) case 'x': cfg_rx_buf_len = page_size * strtoul(optarg, NULL, 0); break; + case 'F': + cfg_check_payload_offset = true; + cfg_min_payload_offset = strtoul(optarg, NULL, 0); + break; case 'd': cfg_dry_run = true; break; @@ -484,6 +503,9 @@ static void parse_opts(int argc, char **argv) if (cfg_payload_len > max_payload_len) error(1, 0, "-l: payload exceeds max (%d)", max_payload_len); + if (cfg_check_payload_offset && + cfg_min_payload_offset >= (cfg_rx_buf_len ?: page_size)) + error(1, 0, "-F: offset outside rx_buf_len"); } int main(int argc, char **argv) -- 2.53.0