From patchwork Mon Nov 16 11:04:11 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: 1400830 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=CPB6QtpF; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CZR7Q5jjRz9sSn for ; Mon, 16 Nov 2020 22:05:22 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729681AbgKPLFE (ORCPT ); Mon, 16 Nov 2020 06:05:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41062 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726353AbgKPLFD (ORCPT ); Mon, 16 Nov 2020 06:05:03 -0500 Received: from mail-pf1-x442.google.com (mail-pf1-x442.google.com [IPv6:2607:f8b0:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A2C1FC0613CF; Mon, 16 Nov 2020 03:05:03 -0800 (PST) Received: by mail-pf1-x442.google.com with SMTP id y7so13739695pfq.11; Mon, 16 Nov 2020 03:05:03 -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=J/sQUNnR8paYLJkCpzOYLa3M/4T86xKuicfaQEy6v/Y=; b=CPB6QtpFkGUGzO14hoo/7aPj6dCnxJsmViCIqSCstC7t07M31cAebsZ2fC8XA/TXIR 3O5izqkuaUnF4YU5ob/uhZJDxqnbKnKP/XyGUmvC9QI+UMn4ZSBqJkKLVG+hjQvWZ+IP mQzRG3IhHFsY0goeT3N09r6Nde/NUywnf/dYO9PIjsr2Cp5xRgV2wRE5HqKs1E2gtoiH mUqGm7f0AzCO9wYEhak3YYqyqvkZj8uV1nWsRXBwrah4iizVdnzolnxV4w2Ev+VEkVxW 3l2MCjKyvvqvKrpbBBVpjvygDQz/gbh4sHlbm4IdCVd+qww7KamGv538/1pPm3gehQYG QZew== 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=J/sQUNnR8paYLJkCpzOYLa3M/4T86xKuicfaQEy6v/Y=; b=XRDxBl6y9fcMK8L3p5/t3C4/XXtIavoObUZhstpztKJLaWt2WuoWh+Q1IJa5EjjZlB KmDXbQi3AlypTTI9AARvh6wwQHkJS6/iJ2T/Czx56WequceucpWsGQVtMYPKKueWyCCL mqdikopnic/tJntyI0uFjlVY5k4we65040Avf3vI7iTP2dlp1Aw/cocNstl03EFGNLkC vH/tx1JTMl77YhsBJAlyVgtCjMtTi1RozKNeIyJTJnta0I9KVP8yLfzS5obFvNTb/q0H vAAC2hWaH0qpsGxRO4zDpNSg8y9KwlOjIgMxQ/0DDJ1IwtwyWxBinKSIib6Ko3avnsCe BqCA== X-Gm-Message-State: AOAM530k1Zttn1JX7mHoVviKrhigqj3sfT0v47yTXW3rTDBT6fLtrK0s /JaUVL+geVbnjiZ/mp4NQHqJgBujxjvKQQ== X-Google-Smtp-Source: ABdhPJwVTyqvQ7aPoPc/6aRXHes3j91pRHx3x7BB4/o3gcOoqsiUq+mVPbb8vTh5lvJKMPgBi2gqwQ== X-Received: by 2002:a63:6341:: with SMTP id x62mr12537625pgb.93.1605524702337; Mon, 16 Nov 2020 03:05:02 -0800 (PST) Received: from btopel-mobl.ger.intel.com ([192.55.55.41]) by smtp.gmail.com with ESMTPSA id a23sm15752890pgv.35.2020.11.16.03.04.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Nov 2020 03:05:01 -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 05/10] xsk: add busy-poll support for {recv,send}msg() Date: Mon, 16 Nov 2020 12:04:11 +0100 Message-Id: <20201116110416.10719-6-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 Wire-up XDP socket busy-poll support for recvmsg() and sendmsg(). If the XDP socket prefers busy-polling, make sure that no wakeup/IPI is performed. Signed-off-by: Björn Töpel --- net/xdp/xsk.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index 1cb04b5e4247..a71a14fedfec 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include "xsk_queue.h" @@ -460,6 +461,17 @@ static int __xsk_sendmsg(struct sock *sk) return xs->zc ? xsk_zc_xmit(xs) : xsk_generic_xmit(sk); } +static bool xsk_no_wakeup(struct sock *sk) +{ +#ifdef CONFIG_NET_RX_BUSY_POLL + /* Prefer busy-polling, skip the wakeup. */ + return READ_ONCE(sk->sk_prefer_busy_poll) && READ_ONCE(sk->sk_ll_usec) && + READ_ONCE(sk->sk_napi_id) >= MIN_NAPI_ID; +#else + return false; +#endif +} + static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) { bool need_wait = !(m->msg_flags & MSG_DONTWAIT); @@ -472,6 +484,12 @@ static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) if (unlikely(need_wait)) return -EOPNOTSUPP; + if (sk_can_busy_loop(sk)) + sk_busy_loop(sk, 1); /* only support non-blocking sockets */ + + if (xsk_no_wakeup(sk)) + return 0; + pool = xs->pool; if (pool->cached_need_wakeup & XDP_WAKEUP_TX) return __xsk_sendmsg(sk); @@ -493,6 +511,12 @@ static int xsk_recvmsg(struct socket *sock, struct msghdr *m, size_t len, int fl if (unlikely(need_wait)) return -EOPNOTSUPP; + if (sk_can_busy_loop(sk)) + sk_busy_loop(sk, 1); /* only support non-blocking sockets */ + + if (xsk_no_wakeup(sk)) + return 0; + if (xs->pool->cached_need_wakeup & XDP_WAKEUP_RX && xs->zc) return xsk_wakeup(xs, XDP_WAKEUP_RX); return 0;