From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 99259C54EAA for ; Fri, 27 Jan 2023 18:25:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235108AbjA0SZf (ORCPT ); Fri, 27 Jan 2023 13:25:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57832 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233524AbjA0SZe (ORCPT ); Fri, 27 Jan 2023 13:25:34 -0500 Received: from smtp-relay-internal-1.canonical.com (smtp-relay-internal-1.canonical.com [185.125.188.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 646367AE6A for ; Fri, 27 Jan 2023 10:25:33 -0800 (PST) Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-internal-1.canonical.com (Postfix) with ESMTPS id DFAA73F2FA for ; Fri, 27 Jan 2023 18:16:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1674843402; bh=NS1tmL66awX/7is5ZjMX3UkQ9Ca2dXMZqnsizI2is20=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=OcuPu84ghnOv9eorwme5r1agSydD5Pz1+zvd0SaXTPS5dsWlRN/W/dE0C+zA24hwS odwj18+q3L6I3V9cMFkLAxTVaInQwoir6LZhqKWwC5U+SO3gG4blcGct0EOoAWkNnG vFfv0EcEGJPFfZdcAo8pSbB0XYhrad1FuRcRgZxLDm/v1/l6y23HKQb/vVRv+tB0Qu taKBLL7fylEWyqXRe2lSPHBUDOkQ7QnDS77HaWeeyvvSl6cLvuVQEgQ+5xydpHmZ1n cUFSJFeI3OIxGR7TQHYvEnaOYxeGEgUipV+Y6LJLcvepKsZd/NU9aacQCzFrMjcUZv XBKMDrC170KnQ== Received: by mail-wm1-f70.google.com with SMTP id n40-20020a05600c3ba800b003dc3633ebc8so972590wms.2 for ; Fri, 27 Jan 2023 10:16:42 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=NS1tmL66awX/7is5ZjMX3UkQ9Ca2dXMZqnsizI2is20=; b=krD+5Y095l67Eo2JHgfX1LAk3vuo9c5lNMQj4oaXApwZCt8EGdyDclFtk4MF6zpPc/ ecQ+eZARmjHnHRhwBTFglReCgkm5Y+cEuaPXYIqIV8C8RaMxqrSJwzFJGd3zYFXPkmDN VD/rwyHrYNuCOgxuvwRjQufQXFBZmiPEFN0eBZicScZeO5FEl5gIbiLXjkjaYq6IB4EH XUnojrx+N1S0MT7CIA2lG1srAXZMXUyotdWciIkC534dc4dJ3Te7JyArO+h7nP+AU822 6hz/zNizzXMHh5+oJ864xsHlDwHqvIcfLGyTIgWIMkWVjIxojyJWOSEYzXAB2C8aGI5P LBDQ== X-Gm-Message-State: AFqh2kqoRRsAhnksgHY2SJKHLa/7YbjP6OsjFj+5+roMg8bPtrD9koWd uavrH+kcncfXX8r3GzHIdIKTtBeVvyfT0G9d3ahnAET12zDcK6OS/OuuiufT3JO/yXUUwrnOzuB MSVQEGyFLnKJPNnF2Qt6/DYqxnpDoR9OksA== X-Received: by 2002:adf:ce06:0:b0:2bf:95cc:744c with SMTP id p6-20020adfce06000000b002bf95cc744cmr22921796wrn.0.1674843401387; Fri, 27 Jan 2023 10:16:41 -0800 (PST) X-Google-Smtp-Source: AMrXdXs81PzIVwkImeU01Xj6gNTWRhY8/AaM+bmQlNIMb3W6rmGJizQ7t8D6RRx8NOndZeC5qb9/ug== X-Received: by 2002:adf:ce06:0:b0:2bf:95cc:744c with SMTP id p6-20020adfce06000000b002bf95cc744cmr22921787wrn.0.1674843401196; Fri, 27 Jan 2023 10:16:41 -0800 (PST) Received: from qwirkle.internal ([81.2.157.149]) by smtp.gmail.com with ESMTPSA id a18-20020adffad2000000b002be53aa2260sm5122798wrs.117.2023.01.27.10.16.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Jan 2023 10:16:40 -0800 (PST) From: Andrei Gherzan To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Shuah Khan , Willem de Bruijn Cc: Andrei Gherzan , netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] selftests: net: udpgso_bench_tx: Introduce exponential back-off retries Date: Fri, 27 Jan 2023 18:16:25 +0000 Message-Id: <20230127181625.286546-1-andrei.gherzan@canonical.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The tx and rx test programs are used in a couple of test scripts including "udpgro_bench.sh". Taking this as an example, when the rx/tx programs are invoked subsequently, there is a chance that the rx one is not ready to accept socket connections. This racing bug could fail the test with at least one of the following: ./udpgso_bench_tx: connect: Connection refused ./udpgso_bench_tx: sendmsg: Connection refused ./udpgso_bench_tx: write: Connection refused This change addresses this by adding routines that retry the socket operations with an exponential back off algorithm from 100ms to 2s. Fixes: 3a687bef148d ("selftests: udp gso benchmark") Signed-off-by: Andrei Gherzan --- tools/testing/selftests/net/udpgso_bench_tx.c | 57 +++++++++++++------ 1 file changed, 41 insertions(+), 16 deletions(-) diff --git a/tools/testing/selftests/net/udpgso_bench_tx.c b/tools/testing/selftests/net/udpgso_bench_tx.c index f1fdaa270291..4dea9ee7eb46 100644 --- a/tools/testing/selftests/net/udpgso_bench_tx.c +++ b/tools/testing/selftests/net/udpgso_bench_tx.c @@ -53,6 +53,9 @@ #define NUM_PKT 100 +#define MAX_DELAY 2000000 +#define INIT_DELAY 100000 + static bool cfg_cache_trash; static int cfg_cpu = -1; static int cfg_connected = true; @@ -257,13 +260,18 @@ static void flush_errqueue(int fd, const bool do_poll) static int send_tcp(int fd, char *data) { int ret, done = 0, count = 0; + useconds_t delay = INIT_DELAY; while (done < cfg_payload_len) { - ret = send(fd, data + done, cfg_payload_len - done, - cfg_zerocopy ? MSG_ZEROCOPY : 0); - if (ret == -1) - error(1, errno, "write"); - + delay = INIT_DELAY; + while ((ret = send(fd, data + done, cfg_payload_len - done, + cfg_zerocopy ? MSG_ZEROCOPY : 0)) == -1) { + usleep(delay); + if (delay < MAX_DELAY) + delay *= 2; + else + error(1, errno, "write"); + } done += ret; count++; } @@ -274,17 +282,23 @@ static int send_tcp(int fd, char *data) static int send_udp(int fd, char *data) { int ret, total_len, len, count = 0; + useconds_t delay = INIT_DELAY; total_len = cfg_payload_len; while (total_len) { len = total_len < cfg_mss ? total_len : cfg_mss; - ret = sendto(fd, data, len, cfg_zerocopy ? MSG_ZEROCOPY : 0, - cfg_connected ? NULL : (void *)&cfg_dst_addr, - cfg_connected ? 0 : cfg_alen); - if (ret == -1) - error(1, errno, "write"); + delay = INIT_DELAY; + while ((ret = sendto(fd, data, len, cfg_zerocopy ? MSG_ZEROCOPY : 0, + cfg_connected ? NULL : (void *)&cfg_dst_addr, + cfg_connected ? 0 : cfg_alen)) == -1) { + usleep(delay); + if (delay < MAX_DELAY) + delay *= 2; + else + error(1, errno, "write"); + } if (ret != len) error(1, errno, "write: %uB != %uB\n", ret, len); @@ -378,6 +392,7 @@ static int send_udp_segment(int fd, char *data) struct iovec iov = {0}; size_t msg_controllen; struct cmsghdr *cmsg; + useconds_t delay = INIT_DELAY; int ret; iov.iov_base = data; @@ -401,9 +416,13 @@ static int send_udp_segment(int fd, char *data) msg.msg_name = (void *)&cfg_dst_addr; msg.msg_namelen = cfg_alen; - ret = sendmsg(fd, &msg, cfg_zerocopy ? MSG_ZEROCOPY : 0); - if (ret == -1) - error(1, errno, "sendmsg"); + while ((ret = sendmsg(fd, &msg, cfg_zerocopy ? MSG_ZEROCOPY : 0)) == -1) { + usleep(delay); + if (delay < MAX_DELAY) + delay *= 2; + else + error(1, errno, "sendmsg"); + } if (ret != iov.iov_len) error(1, 0, "sendmsg: %u != %llu\n", ret, (unsigned long long)iov.iov_len); @@ -616,6 +635,7 @@ int main(int argc, char **argv) { unsigned long num_msgs, num_sends; unsigned long tnow, treport, tstop; + useconds_t delay = INIT_DELAY; int fd, i, val, ret; parse_opts(argc, argv); @@ -648,9 +668,14 @@ int main(int argc, char **argv) } } - if (cfg_connected && - connect(fd, (void *)&cfg_dst_addr, cfg_alen)) - error(1, errno, "connect"); + if (cfg_connected) + while (connect(fd, (void *)&cfg_dst_addr, cfg_alen)) { + usleep(delay); + if (delay < MAX_DELAY) + delay *= 2; + else + error(1, errno, "connect"); + } if (cfg_segment) set_pmtu_discover(fd, cfg_family == PF_INET); -- 2.34.1