From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from codeconstruct.com.au (pi.codeconstruct.com.au [203.29.241.158]) (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 D1D9E378824; Thu, 3 Sep 2026 02:42:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=203.29.241.158 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788403374; cv=none; b=O860HLtcDt9k2DmyboN1rLRy6QT0CqvDMM3ucAHENTmYn3QiDNiSce6sggMBGPlrGyi7ECOOmsIgOgP16Jc9KRjOug5AgsSwUsy4Ewqg85GAhEooMZ+9QboJvGSnkf06VFTIoG1AAmZlQVlVGxWyWSDJBKELb50HiiYj1bwaNow= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788403374; c=relaxed/simple; bh=5rdqYpRjHKQgLUsJduiAGoo12p/VCrnSrAA1xfJnwLE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=dCTZsyyT6zJjoHG3hV666OJYeP+SaePDj+tdrpz+3XQ45lABiADYLUKmPLzrNCo+lBHy+nBGfQvJxlU1bFBq0vZoU63RAVChuYHav1UcY1B+A/1eaQ9ugR9wlKT/w6xPKkaCMzd4tznUffaOpSQuNIJf5cGHEXUdG7pHt09w9tA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codeconstruct.com.au; spf=pass smtp.mailfrom=codeconstruct.com.au; dkim=pass (2048-bit key) header.d=codeconstruct.com.au header.i=@codeconstruct.com.au header.b=ZoEFlRvB; arc=none smtp.client-ip=203.29.241.158 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codeconstruct.com.au Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=codeconstruct.com.au Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=codeconstruct.com.au header.i=@codeconstruct.com.au header.b="ZoEFlRvB" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=codeconstruct.com.au; s=2022a; t=1788403361; bh=PlTn3I9kXfPLw7BlbtROwprK/Ezk0JfYuxV+O8GWhsw=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=ZoEFlRvB8IzB36oByjXQ4XOu/gJE0W6Q/1HUjzf11NRG7R+SwjjrdJcWrwWfGbT4T PpvdVoJ5VE/szK4vqmOWf+fBc3+WMqqFKiffCDZeKi1kai+XZ+N7A9OdwPsNShET76 TsIdfGEk7gNfOIkGs5OR/cuuF0G5ERQ0XU9jg1b1bEA/hdtLnGJJwLDAD8FWqzRis9 vHXcmOM5OxiUPR1sbM/NmdOyFG/ZkAamCo2OhtxylYXcYHUzSlT/0vvhhACXZCWOkI LYIqdUQnHT0rE+2c4glepMfUgqXlx4eXqI4OsiBmMRQ9axmps8l2lmvqkx0rWs7nx9 jUK6gf0194bDw== Received: by codeconstruct.com.au (Postfix, from userid 10004) id 63FE068697; Thu, 3 Sep 2026 10:42:41 +0800 (AWST) From: James Lee Date: Thu, 03 Sep 2026 10:42:24 +0800 Subject: [PATCH net-next v2 7/7] net: mctp: usblib: Add test for failing append Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260903-dev-mctp-usb-lib-test-v2-7-313cf15e0b56@codeconstruct.com.au> References: <20260903-dev-mctp-usb-lib-test-v2-0-313cf15e0b56@codeconstruct.com.au> In-Reply-To: <20260903-dev-mctp-usb-lib-test-v2-0-313cf15e0b56@codeconstruct.com.au> To: Jeremy Kerr , Matt Johnston , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Kees Cook , "Gustavo A. R. Silva" Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, James Lee X-Mailer: b4 0.14.2 Add test ensuring that network device stats are updated appropriately when a previously pushed packet fails to send during a subsequent push. Signed-off-by: James Lee --- v2: - Fix preemption management --- drivers/net/mctp/mctp-usblib-test.c | 42 +++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/drivers/net/mctp/mctp-usblib-test.c b/drivers/net/mctp/mctp-usblib-test.c index 73bda4745433f689504e65685b73da2117f1d3db..25eac80db3e2d12aabdabbe234261dc335d653b8 100644 --- a/drivers/net/mctp/mctp-usblib-test.c +++ b/drivers/net/mctp/mctp-usblib-test.c @@ -867,6 +867,47 @@ static void mctp_usblib_test_tx_multi_push(struct kunit *test) KUNIT_EXPECT_EQ(test, i, ARRAY_SIZE(sends)); } +static void mctp_usblib_test_tx_overflow(struct kunit *test) +{ + struct mctp_usblib_test_ctx *ctx; + struct mctp_usblib_tx_ops ops; + struct pcpu_dstats *dstats; + struct mctp_usblib_tx *tx; + struct net_device *ndev; + struct sk_buff *skb; + unsigned int start; + size_t len, i; + u64 stats; + u8 *buf; + int rc; + + len = 200; + + ctx = mctp_usblib_test_init(test); + ndev = ctx->dev->ndev; + + ops.send = mctp_usblib_test_tx_send_fail; + + tx = mctp_usblib_test_tx_init(test, &ops, ctx, false); + buf = mctp_usblib_test_init_buf(test, len); + + dstats = get_cpu_ptr(ndev->dstats); + for (i = 0; i < 3; i++) { + skb = mctp_usblib_test_init_skb(test, len, ndev, buf); + + rc = mctp_usblib_tx_push(ndev, tx, skb, i != 2); + KUNIT_EXPECT_EQ(test, rc, 0); + } + + do { + start = u64_stats_fetch_begin(&dstats->syncp); + stats = u64_stats_read(&dstats->tx_drops); + } while (u64_stats_fetch_retry(&dstats->syncp, start)); + put_cpu_ptr(dstats); + + KUNIT_EXPECT_EQ(test, stats, 3); +} + static struct kunit_case mctp_usblib_test_cases[] = { KUNIT_CASE(mctp_usblib_test_rx_single), KUNIT_CASE_PARAM(mctp_usblib_test_rx_pkt_span, @@ -879,6 +920,7 @@ static struct kunit_case mctp_usblib_test_cases[] = { KUNIT_CASE(mctp_usblib_test_tx_pkt_span), KUNIT_CASE(mctp_usblib_test_tx_multi_push), KUNIT_CASE(mctp_usblib_test_tx_failing_send), + KUNIT_CASE(mctp_usblib_test_tx_overflow), {} }; -- 2.47.3