From patchwork Mon Nov 16 11:04:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= X-Patchwork-Id: 1400834 Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=nugf//tF; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CZR7h27fGz9s1l for ; Mon, 16 Nov 2020 22:05:36 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729689AbgKPLFf (ORCPT ); Mon, 16 Nov 2020 06:05:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41152 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726353AbgKPLFe (ORCPT ); Mon, 16 Nov 2020 06:05:34 -0500 Received: from mail-pg1-x544.google.com (mail-pg1-x544.google.com [IPv6:2607:f8b0:4864:20::544]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B5324C0613CF; Mon, 16 Nov 2020 03:05:34 -0800 (PST) Received: by mail-pg1-x544.google.com with SMTP id j19so6091429pgg.5; Mon, 16 Nov 2020 03:05:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ox+Gu8oX8q3AYdKpOHlwt3cd8ctIGiNWqRigSBry/Cc=; b=nugf//tFoPdtX3rHhD+mNGsjEN4FeaMhlqwp4Yy2bkwKW9gl0GhSIdvo1jhRBcpERE 1f3I7UxqG7FfJ5Ha6UCxt21O5zEztyuzOHbMkgjRNrWfZcxIe/rfhcNME9tml/9n/8vG mA6bLp62YJ8JKhMJdvlf2jatX/I5hQmwSK+69mKbMPsZJa3A1Mv7gUMxV7pVBMeyClPo PqRl/XMj5/y15HM1nziO+sU6naBAyPgTCxJMNk1Bu2e7h/E0ANt306Gl9xVdiMo+w3Zz 2V3TXVMsMOr1u2V0m/X8jncP2Nv5c/XL2QKvKrFvyt/vVRhL0/zmznk5ZhESQf1GXMO1 17Hg== 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=ox+Gu8oX8q3AYdKpOHlwt3cd8ctIGiNWqRigSBry/Cc=; b=BShxYy07eBdIlIo2q/ArRmpWQ4gmf/p5+ArsNmUfnsozArvjLiGZmjDlDaDLtjGNri 6S0vNDyX2tJw4R/AlvhEsjRDihNEeUYOjDo/mlSM3+JbulBl3NFEOX0/z6mQOurBN7Z1 ZJMHVvMQ1AfL3qvzQnpEkm243bbI+7zDgWZ8a9eqoG331JYAF5tKQ/RmFv79ypvqSBrc WkOaeaHP6S/XtmGwkGy98Fe//X/e2clWt4bZWZhYRcaXCQUeRd5TttZPhnniw1ECHqMN /xtm8q/Kegl9+lO6KdcF9grLOVgNNnnMT20pWebuAzQefukA0hSa3Yg3lFYIs+p7VTWX v3eQ== X-Gm-Message-State: AOAM533Gicc6BWmgK2VFDHxCX4bgDJtV9E0ufWeARpw46qwIEMmFL9IB l6ll0QpN5ilW1jetIscG4jqLQ2eQhibN9RR/ X-Google-Smtp-Source: ABdhPJyTbqRj63A1IOkt71O75qVXlaOfcnNL6+XlBNhecD7ZEqrkMSqFMIEY7SgTLJ7ATc2/ovUy4A== X-Received: by 2002:a17:90a:9dc6:: with SMTP id x6mr15828957pjv.100.1605524733695; Mon, 16 Nov 2020 03:05:33 -0800 (PST) Received: from btopel-mobl.ger.intel.com ([192.55.55.41]) by smtp.gmail.com with ESMTPSA id a23sm15752890pgv.35.2020.11.16.03.05.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Nov 2020 03:05:32 -0800 (PST) From: =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= To: netdev@vger.kernel.org, bpf@vger.kernel.org Cc: =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , magnus.karlsson@intel.com, ast@kernel.org, daniel@iogearbox.net, maciej.fijalkowski@intel.com, sridhar.samudrala@intel.com, jesse.brandeburg@intel.com, qi.z.zhang@intel.com, kuba@kernel.org, edumazet@google.com, jonathan.lemon@gmail.com, maximmi@nvidia.com Subject: [PATCH bpf-next v2 09/10] samples/bpf: add busy-poll support to xdpsock Date: Mon, 16 Nov 2020 12:04:15 +0100 Message-Id: <20201116110416.10719-10-bjorn.topel@gmail.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20201116110416.10719-1-bjorn.topel@gmail.com> References: <20201116110416.10719-1-bjorn.topel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Björn Töpel Add a new option to xdpsock, 'B', for busy-polling. This option will also set the batching size, 'b' option, to the busy-poll budget. Signed-off-by: Björn Töpel --- samples/bpf/xdpsock_user.c | 40 +++++++++++++++++++++++++++++++------- 1 file changed, 33 insertions(+), 7 deletions(-) diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c index bc4ef3ac9dfb..09a9fc76f072 100644 --- a/samples/bpf/xdpsock_user.c +++ b/samples/bpf/xdpsock_user.c @@ -95,6 +95,7 @@ static int opt_timeout = 1000; static bool opt_need_wakeup = true; static u32 opt_num_xsks = 1; static u32 prog_id; +static bool opt_busy_poll; struct xsk_ring_stats { unsigned long rx_npkts; @@ -911,6 +912,7 @@ static struct option long_options[] = { {"quiet", no_argument, 0, 'Q'}, {"app-stats", no_argument, 0, 'a'}, {"irq-string", no_argument, 0, 'I'}, + {"busy-poll", no_argument, 0, 'B'}, {0, 0, 0, 0} }; @@ -949,6 +951,7 @@ static void usage(const char *prog) " -Q, --quiet Do not display any stats.\n" " -a, --app-stats Display application (syscall) statistics.\n" " -I, --irq-string Display driver interrupt statistics for interface associated with irq-string.\n" + " -B, --busy-poll Busy poll.\n" "\n"; fprintf(stderr, str, prog, XSK_UMEM__DEFAULT_FRAME_SIZE, opt_batch_size, MIN_PKT_SIZE, MIN_PKT_SIZE, @@ -964,7 +967,7 @@ static void parse_command_line(int argc, char **argv) opterr = 0; for (;;) { - c = getopt_long(argc, argv, "Frtli:q:pSNn:czf:muMd:b:C:s:P:xQaI:", + c = getopt_long(argc, argv, "Frtli:q:pSNn:czf:muMd:b:C:s:P:xQaI:B", long_options, &option_index); if (c == -1) break; @@ -1062,7 +1065,9 @@ static void parse_command_line(int argc, char **argv) fprintf(stderr, "ERROR: Failed to get irqs for %s\n", opt_irq_str); usage(basename(argv[0])); } - + break; + case 'B': + opt_busy_poll = 1; break; default: usage(basename(argv[0])); @@ -1131,7 +1136,7 @@ static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk) while (ret != rcvd) { if (ret < 0) exit_with_error(-ret); - if (xsk_ring_prod__needs_wakeup(&umem->fq)) { + if (opt_busy_poll || xsk_ring_prod__needs_wakeup(&umem->fq)) { xsk->app_stats.fill_fail_polls++; recvfrom(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL, NULL); } @@ -1179,7 +1184,7 @@ static void rx_drop(struct xsk_socket_info *xsk) rcvd = xsk_ring_cons__peek(&xsk->rx, opt_batch_size, &idx_rx); if (!rcvd) { - if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) { + if (opt_busy_poll || xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) { xsk->app_stats.rx_empty_polls++; recvfrom(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL, NULL); } @@ -1190,7 +1195,7 @@ static void rx_drop(struct xsk_socket_info *xsk) while (ret != rcvd) { if (ret < 0) exit_with_error(-ret); - if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) { + if (opt_busy_poll || xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) { xsk->app_stats.fill_fail_polls++; recvfrom(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL, NULL); } @@ -1341,7 +1346,7 @@ static void l2fwd(struct xsk_socket_info *xsk) rcvd = xsk_ring_cons__peek(&xsk->rx, opt_batch_size, &idx_rx); if (!rcvd) { - if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) { + if (opt_busy_poll || xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) { xsk->app_stats.rx_empty_polls++; recvfrom(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL, NULL); } @@ -1353,7 +1358,7 @@ static void l2fwd(struct xsk_socket_info *xsk) if (ret < 0) exit_with_error(-ret); complete_tx_l2fwd(xsk); - if (xsk_ring_prod__needs_wakeup(&xsk->tx)) { + if (opt_busy_poll || xsk_ring_prod__needs_wakeup(&xsk->tx)) { xsk->app_stats.tx_wakeup_sendtos++; kick_tx(xsk); } @@ -1458,6 +1463,24 @@ static void enter_xsks_into_map(struct bpf_object *obj) } } +static void apply_setsockopt(struct xsk_socket_info *xsk) +{ + int sock_opt; + + if (!opt_busy_poll) + return; + + sock_opt = 1; + if (setsockopt(xsk_socket__fd(xsk->xsk), SOL_SOCKET, SO_PREFER_BUSY_POLL, + (void *)&sock_opt, sizeof(sock_opt)) < 0) + exit_with_error(errno); + + sock_opt = 20; + if (setsockopt(xsk_socket__fd(xsk->xsk), SOL_SOCKET, SO_BUSY_POLL, + (void *)&sock_opt, sizeof(sock_opt)) < 0) + exit_with_error(errno); +} + int main(int argc, char **argv) { struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; @@ -1499,6 +1522,9 @@ int main(int argc, char **argv) for (i = 0; i < opt_num_xsks; i++) xsks[num_socks++] = xsk_configure_socket(umem, rx, tx); + for (i = 0; i < opt_num_xsks; i++) + apply_setsockopt(xsks[i]); + if (opt_bench == BENCH_TXONLY) { gen_eth_hdr_data();