From patchwork Wed Apr 28 16:47:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Melnichenko X-Patchwork-Id: 1471320 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=daynix-com.20150623.gappssmtp.com header.i=@daynix-com.20150623.gappssmtp.com header.a=rsa-sha256 header.s=20150623 header.b=mP+OTK3M; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4FVl2j00cKz9sWD for ; Thu, 29 Apr 2021 02:49:00 +1000 (AEST) Received: from localhost ([::1]:35500 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lbnMw-000441-W1 for incoming@patchwork.ozlabs.org; Wed, 28 Apr 2021 12:48:59 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34162) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lbnLp-00041z-Fm for qemu-devel@nongnu.org; Wed, 28 Apr 2021 12:47:49 -0400 Received: from mail-lf1-x135.google.com ([2a00:1450:4864:20::135]:33586) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lbnLm-0006gT-VG for qemu-devel@nongnu.org; Wed, 28 Apr 2021 12:47:49 -0400 Received: by mail-lf1-x135.google.com with SMTP id j4so60829921lfp.0 for ; Wed, 28 Apr 2021 09:47:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=daynix-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ibirWkv6uSYSQxoczRpL46TKKwuomQRszme/uUDeX18=; b=mP+OTK3MuJ+5goWsnhXiNWiZU/dslJyRz6FrBrhyDj5mLhEXDLuZ4SVV9MFSW5773b 1Gr95LAApA1nlV2OOZpRxdoAwHoaGjRSDUDHhHFrp2AYXA8XzN2BsifbD2Jc6i3+HGda euJH11OushZYNzw+qNHQF784JtJZxW0kuRkciyVBotReBVpjrgfxh/MlZft7psfpUSuq Vlrw3mMqeUABXH2C8uKouq63UyLsooyJOsiz84H5f4Pp2wGDVIApCq/QhB8vQrWj7ecU +dbpIyP69pSE7PldJwcl58vmbyMr1f+zYicpUtbS6hG+DSkWq67w95cD0+I2PEOB8ymz oFDA== 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=ibirWkv6uSYSQxoczRpL46TKKwuomQRszme/uUDeX18=; b=ptuBoZTIeXboQ7T1iiNxD3q2+Jo90mJ4yCNiadj3Er+tLeH3UzNU6yVGoWXbvDd9/z 7IZLy/4rXPZsDwKkOPLnffYv5Upq3fKIgOpxH0GzsIa5O6ndAinwErTCEhIsDGSM9IFG DPzibGzki/H4ULuRqqv0G6LvUl51Z3zYVvJYG9cIssRduUieV01VY3zMrOl6vBUkV3RV 0pReoPI4Z5csdhlJtLtc4HyTrwW3AqB6VlX7bYqwAYpdgmDbDpsqE00EAz/5LoO1PuJ6 aV1KmiAriLK7IckVl2X0qvwesBCW/ezlJiyKqQtIcIVH1qDOq8ltyGlkHkJQkTsdwwC7 q/PA== X-Gm-Message-State: AOAM530yL+t7+EcBN3WBOXpodS+Yjz1xeyFsGxCfu/GjNmpDJpWP1rL1 VrtkIsweRyGe8uhtwfH8GmO8eA== X-Google-Smtp-Source: ABdhPJxm1wvGDTYMaVKyyDbP6Szz2XpR+KXG+RnsYJBudntJpMnxjqvyEt2QV/JNhOG1vxFH53UK5Q== X-Received: by 2002:ac2:4883:: with SMTP id x3mr3711223lfc.494.1619628463908; Wed, 28 Apr 2021 09:47:43 -0700 (PDT) Received: from navi.cosmonova.net.ua ([95.67.24.131]) by smtp.gmail.com with ESMTPSA id v24sm86302lfp.195.2021.04.28.09.47.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Apr 2021 09:47:43 -0700 (PDT) From: Andrew Melnychenko To: jasowang@redhat.com, mst@redhat.com Subject: [PATCH v7 1/7] net/tap: Added TUNSETSTEERINGEBPF code. Date: Wed, 28 Apr 2021 19:47:27 +0300 Message-Id: <20210428164733.56547-2-andrew@daynix.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210428164733.56547-1-andrew@daynix.com> References: <20210428164733.56547-1-andrew@daynix.com> MIME-Version: 1.0 Received-SPF: none client-ip=2a00:1450:4864:20::135; envelope-from=andrew@daynix.com; helo=mail-lf1-x135.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: yan@daynix.com, yuri.benditovich@daynix.com, berrange@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Additional code that will be used for eBPF setting steering routine. Signed-off-by: Andrew Melnychenko --- net/tap-linux.h | 1 + 1 file changed, 1 insertion(+) diff --git a/net/tap-linux.h b/net/tap-linux.h index 2f36d100fc..1d06fe0de6 100644 --- a/net/tap-linux.h +++ b/net/tap-linux.h @@ -31,6 +31,7 @@ #define TUNSETQUEUE _IOW('T', 217, int) #define TUNSETVNETLE _IOW('T', 220, int) #define TUNSETVNETBE _IOW('T', 222, int) +#define TUNSETSTEERINGEBPF _IOR('T', 224, int) #endif From patchwork Wed Apr 28 16:47:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Melnichenko X-Patchwork-Id: 1471323 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=daynix-com.20150623.gappssmtp.com header.i=@daynix-com.20150623.gappssmtp.com header.a=rsa-sha256 header.s=20150623 header.b=KTfCIAXp; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4FVl8s42JVz9t1L for ; Thu, 29 Apr 2021 02:54:20 +1000 (AEST) Received: from localhost ([::1]:44590 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lbnS6-0008O6-Bl for incoming@patchwork.ozlabs.org; Wed, 28 Apr 2021 12:54:18 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34262) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lbnLt-00048j-EM for qemu-devel@nongnu.org; Wed, 28 Apr 2021 12:47:53 -0400 Received: from mail-lf1-x135.google.com ([2a00:1450:4864:20::135]:42578) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lbnLm-0006gg-VE for qemu-devel@nongnu.org; Wed, 28 Apr 2021 12:47:53 -0400 Received: by mail-lf1-x135.google.com with SMTP id d27so43489633lfv.9 for ; Wed, 28 Apr 2021 09:47:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=daynix-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=v3yo78votzBUx2BxhduTni1w+nb0etUonkzgNxiZBWQ=; b=KTfCIAXpI44HBo9jnKj4yV7bUPL+rl1hjPsecUxP+hzp0Bau8Ey1+5Ysps196EWgf6 WJyb8TgPfc6Z8c+CDXgJgnQnt9O2hsHlxj+FLMw+dno1Zth7+Jl4Q3Cd3tdNbNqN0Mmj 8rGHPbGbIdKrfaq2KoXRhrS7tjp3x6MVOuvv+6u2xr6cUjtvWh+xvJn83muyMldiadrC WRinJ/D63WvCxHrpCxUTo17SsO4nW1mRkeTe7G51Hk+vMSCx+D7HqFiUIFP76UCVVE2z 6Fz/D1a0r1qybUAHwkpT0DG8BNX7LHIi3dtb54woXan5SAPyKoykYgWxjL/J/Fq9VaUl l68g== 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=v3yo78votzBUx2BxhduTni1w+nb0etUonkzgNxiZBWQ=; b=VVTldlL8FlsZn1+Tgm9BMMqIa7keNCumW71BbvkElJlJsS+bkyLYPoPexCw8j1OWi/ mDUg5rXLnORHDTC61+EYE1jcAxK5iNnxwcXONaJoEMJmzzCuX1gT0nRujr2QugwY2oxr Fk7zuCZ8NRODmPtrRtnIC6KbYpEb/JPSmut5Qyft8cT4+WRdjXhV1YX1qsyFz9ghaUAe 3aowj0u9RC17AXB9ncimcPW6dQBEjnTxB2lwAINrMd51edSm87AHcBXr5k4A0+pyDQ9i xZcqDVEQkvifm2rRBopBufctLKojbY01VXEsjV3aelbaXfGjZLhb5HBFn2ix7lJWeMEw KQyA== X-Gm-Message-State: AOAM5328UicQ1wWBazjHfVWwivstkqfb8NcSRVwszEQRWftBTDbYKKTP 98FzRiA58NC6eviIU+wKclIGbg== X-Google-Smtp-Source: ABdhPJzQKNwa4ra7E+qbqbAaE8BJnRp0Pfijq0CqgGzEcukklGLfBo+fehGpFg0lRrKjyMJoRWfs8g== X-Received: by 2002:a05:6512:34cb:: with SMTP id w11mr21390093lfr.267.1619628464923; Wed, 28 Apr 2021 09:47:44 -0700 (PDT) Received: from navi.cosmonova.net.ua ([95.67.24.131]) by smtp.gmail.com with ESMTPSA id v24sm86302lfp.195.2021.04.28.09.47.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Apr 2021 09:47:44 -0700 (PDT) From: Andrew Melnychenko To: jasowang@redhat.com, mst@redhat.com Subject: [PATCH v7 2/7] net: Added SetSteeringEBPF method for NetClientState. Date: Wed, 28 Apr 2021 19:47:28 +0300 Message-Id: <20210428164733.56547-3-andrew@daynix.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210428164733.56547-1-andrew@daynix.com> References: <20210428164733.56547-1-andrew@daynix.com> MIME-Version: 1.0 Received-SPF: none client-ip=2a00:1450:4864:20::135; envelope-from=andrew@daynix.com; helo=mail-lf1-x135.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: yan@daynix.com, yuri.benditovich@daynix.com, berrange@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" For now, that method supported only by Linux TAP. Linux TAP uses TUNSETSTEERINGEBPF ioctl. Signed-off-by: Andrew Melnychenko --- include/net/net.h | 2 ++ net/tap-bsd.c | 5 +++++ net/tap-linux.c | 13 +++++++++++++ net/tap-solaris.c | 5 +++++ net/tap-stub.c | 5 +++++ net/tap.c | 9 +++++++++ net/tap_int.h | 1 + 7 files changed, 40 insertions(+) diff --git a/include/net/net.h b/include/net/net.h index 1ef536d771..5d1508081f 100644 --- a/include/net/net.h +++ b/include/net/net.h @@ -61,6 +61,7 @@ typedef int (SetVnetBE)(NetClientState *, bool); typedef struct SocketReadState SocketReadState; typedef void (SocketReadStateFinalize)(SocketReadState *rs); typedef void (NetAnnounce)(NetClientState *); +typedef bool (SetSteeringEBPF)(NetClientState *, int); typedef struct NetClientInfo { NetClientDriver type; @@ -82,6 +83,7 @@ typedef struct NetClientInfo { SetVnetLE *set_vnet_le; SetVnetBE *set_vnet_be; NetAnnounce *announce; + SetSteeringEBPF *set_steering_ebpf; } NetClientInfo; struct NetClientState { diff --git a/net/tap-bsd.c b/net/tap-bsd.c index 77aaf674b1..4f64f31e98 100644 --- a/net/tap-bsd.c +++ b/net/tap-bsd.c @@ -259,3 +259,8 @@ int tap_fd_get_ifname(int fd, char *ifname) { return -1; } + +int tap_fd_set_steering_ebpf(int fd, int prog_fd) +{ + return -1; +} diff --git a/net/tap-linux.c b/net/tap-linux.c index b0635e9e32..9584769740 100644 --- a/net/tap-linux.c +++ b/net/tap-linux.c @@ -316,3 +316,16 @@ int tap_fd_get_ifname(int fd, char *ifname) pstrcpy(ifname, sizeof(ifr.ifr_name), ifr.ifr_name); return 0; } + +int tap_fd_set_steering_ebpf(int fd, int prog_fd) +{ + if (ioctl(fd, TUNSETSTEERINGEBPF, (void *) &prog_fd) != 0) { + error_report("Issue while setting TUNSETSTEERINGEBPF:" + " %s with fd: %d, prog_fd: %d", + strerror(errno), fd, prog_fd); + + return -1; + } + + return 0; +} diff --git a/net/tap-solaris.c b/net/tap-solaris.c index 0475a58207..d85224242b 100644 --- a/net/tap-solaris.c +++ b/net/tap-solaris.c @@ -255,3 +255,8 @@ int tap_fd_get_ifname(int fd, char *ifname) { return -1; } + +int tap_fd_set_steering_ebpf(int fd, int prog_fd) +{ + return -1; +} diff --git a/net/tap-stub.c b/net/tap-stub.c index de525a2e69..a0fa25804b 100644 --- a/net/tap-stub.c +++ b/net/tap-stub.c @@ -85,3 +85,8 @@ int tap_fd_get_ifname(int fd, char *ifname) { return -1; } + +int tap_fd_set_steering_ebpf(int fd, int prog_fd) +{ + return -1; +} diff --git a/net/tap.c b/net/tap.c index bae895e287..f5686bbf77 100644 --- a/net/tap.c +++ b/net/tap.c @@ -347,6 +347,14 @@ static void tap_poll(NetClientState *nc, bool enable) tap_write_poll(s, enable); } +static bool tap_set_steering_ebpf(NetClientState *nc, int prog_fd) +{ + TAPState *s = DO_UPCAST(TAPState, nc, nc); + assert(nc->info->type == NET_CLIENT_DRIVER_TAP); + + return tap_fd_set_steering_ebpf(s->fd, prog_fd) == 0; +} + int tap_get_fd(NetClientState *nc) { TAPState *s = DO_UPCAST(TAPState, nc, nc); @@ -372,6 +380,7 @@ static NetClientInfo net_tap_info = { .set_vnet_hdr_len = tap_set_vnet_hdr_len, .set_vnet_le = tap_set_vnet_le, .set_vnet_be = tap_set_vnet_be, + .set_steering_ebpf = tap_set_steering_ebpf, }; static TAPState *net_tap_fd_init(NetClientState *peer, diff --git a/net/tap_int.h b/net/tap_int.h index 225a49ea48..547f8a5a28 100644 --- a/net/tap_int.h +++ b/net/tap_int.h @@ -44,5 +44,6 @@ int tap_fd_set_vnet_be(int fd, int vnet_is_be); int tap_fd_enable(int fd); int tap_fd_disable(int fd); int tap_fd_get_ifname(int fd, char *ifname); +int tap_fd_set_steering_ebpf(int fd, int prog_fd); #endif /* NET_TAP_INT_H */ From patchwork Wed Apr 28 16:47:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Melnichenko X-Patchwork-Id: 1471324 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=daynix-com.20150623.gappssmtp.com header.i=@daynix-com.20150623.gappssmtp.com header.a=rsa-sha256 header.s=20150623 header.b=Kj89ZJzZ; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4FVlCJ0m3Kz9t1L for ; 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Wed, 28 Apr 2021 09:47:45 -0700 (PDT) Received: from navi.cosmonova.net.ua ([95.67.24.131]) by smtp.gmail.com with ESMTPSA id v24sm86302lfp.195.2021.04.28.09.47.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Apr 2021 09:47:45 -0700 (PDT) From: Andrew Melnychenko To: jasowang@redhat.com, mst@redhat.com Subject: [PATCH v7 3/7] ebpf: Added eBPF RSS program. Date: Wed, 28 Apr 2021 19:47:29 +0300 Message-Id: <20210428164733.56547-4-andrew@daynix.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210428164733.56547-1-andrew@daynix.com> References: <20210428164733.56547-1-andrew@daynix.com> MIME-Version: 1.0 Received-SPF: none client-ip=2a00:1450:4864:20::12f; envelope-from=andrew@daynix.com; helo=mail-lf1-x12f.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: yan@daynix.com, yuri.benditovich@daynix.com, berrange@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" RSS program and Makefile to build it. The bpftool used to generate '.h' file. The data in that file may be loaded by libbpf. EBPF compilation is not required for building qemu. You can use Makefile if you need to regenerate rss.bpf.skeleton.h. Signed-off-by: Yuri Benditovich Signed-off-by: Andrew Melnychenko --- tools/ebpf/Makefile.ebpf | 22 ++ tools/ebpf/rss.bpf.c | 569 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 591 insertions(+) create mode 100755 tools/ebpf/Makefile.ebpf create mode 100644 tools/ebpf/rss.bpf.c diff --git a/tools/ebpf/Makefile.ebpf b/tools/ebpf/Makefile.ebpf new file mode 100755 index 0000000000..45b5551fc7 --- /dev/null +++ b/tools/ebpf/Makefile.ebpf @@ -0,0 +1,22 @@ +OBJS = rss.bpf.o + +LLC ?= llc +CLANG ?= clang +INC_FLAGS = `$(CLANG) -print-file-name=include` +EXTRA_CFLAGS ?= -O2 -emit-llvm -fno-stack-protector + +all: $(OBJS) + +.PHONY: clean + +clean: + rm -f $(OBJS) + +$(OBJS): %.o:%.c + $(CLANG) $(INC_FLAGS) \ + -D__KERNEL__ -D__ASM_SYSREG_H \ + -I../include $(LINUXINCLUDE) \ + $(EXTRA_CFLAGS) -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@ + bpftool gen skeleton rss.bpf.o > rss.bpf.skeleton.h + cp rss.bpf.skeleton.h ../../ebpf/ + diff --git a/tools/ebpf/rss.bpf.c b/tools/ebpf/rss.bpf.c new file mode 100644 index 0000000000..9d57ab4212 --- /dev/null +++ b/tools/ebpf/rss.bpf.c @@ -0,0 +1,569 @@ +/* + * eBPF RSS program + * + * Developed by Daynix Computing LTD (http://www.daynix.com) + * + * Authors: + * Andrew Melnychenko + * Yuri Benditovich + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + * Prepare: + * Requires llvm, clang, bpftool, linux kernel tree + * + * Build rss.bpf.skeleton.h: + * make -f Makefile.ebpf clean all + */ + +#include +#include +#include + +#include +#include +#include +#include + +#include +#include + +#include +#include +#include + +#define INDIRECTION_TABLE_SIZE 128 +#define HASH_CALCULATION_BUFFER_SIZE 36 + +struct rss_config_t { + __u8 redirect; + __u8 populate_hash; + __u32 hash_types; + __u16 indirections_len; + __u16 default_queue; +} __attribute__((packed)); + +struct toeplitz_key_data_t { + __u32 leftmost_32_bits; + __u8 next_byte[HASH_CALCULATION_BUFFER_SIZE]; +}; + +struct packet_hash_info_t { + __u8 is_ipv4; + __u8 is_ipv6; + __u8 is_udp; + __u8 is_tcp; + __u8 is_ipv6_ext_src; + __u8 is_ipv6_ext_dst; + __u8 is_fragmented; + + __u16 src_port; + __u16 dst_port; + + union { + struct { + __be32 in_src; + __be32 in_dst; + }; + + struct { + struct in6_addr in6_src; + struct in6_addr in6_dst; + struct in6_addr in6_ext_src; + struct in6_addr in6_ext_dst; + }; + }; +}; + +struct bpf_map_def SEC("maps") +tap_rss_map_configurations = { + .type = BPF_MAP_TYPE_ARRAY, + .key_size = sizeof(__u32), + .value_size = sizeof(struct rss_config_t), + .max_entries = 1, +}; + +struct bpf_map_def SEC("maps") +tap_rss_map_toeplitz_key = { + .type = BPF_MAP_TYPE_ARRAY, + .key_size = sizeof(__u32), + .value_size = sizeof(struct toeplitz_key_data_t), + .max_entries = 1, +}; + +struct bpf_map_def SEC("maps") +tap_rss_map_indirection_table = { + .type = BPF_MAP_TYPE_ARRAY, + .key_size = sizeof(__u32), + .value_size = sizeof(__u16), + .max_entries = INDIRECTION_TABLE_SIZE, +}; + +static inline void net_rx_rss_add_chunk(__u8 *rss_input, size_t *bytes_written, + const void *ptr, size_t size) { + __builtin_memcpy(&rss_input[*bytes_written], ptr, size); + *bytes_written += size; +} + +static inline +void net_toeplitz_add(__u32 *result, + __u8 *input, + __u32 len + , struct toeplitz_key_data_t *key) { + + __u32 accumulator = *result; + __u32 leftmost_32_bits = key->leftmost_32_bits; + __u32 byte; + + for (byte = 0; byte < HASH_CALCULATION_BUFFER_SIZE; byte++) { + __u8 input_byte = input[byte]; + __u8 key_byte = key->next_byte[byte]; + __u8 bit; + + for (bit = 0; bit < 8; bit++) { + if (input_byte & (1 << 7)) { + accumulator ^= leftmost_32_bits; + } + + leftmost_32_bits = + (leftmost_32_bits << 1) | ((key_byte & (1 << 7)) >> 7); + + input_byte <<= 1; + key_byte <<= 1; + } + } + + *result = accumulator; +} + + +static inline int ip6_extension_header_type(__u8 hdr_type) +{ + switch (hdr_type) { + case IPPROTO_HOPOPTS: + case IPPROTO_ROUTING: + case IPPROTO_FRAGMENT: + case IPPROTO_ICMPV6: + case IPPROTO_NONE: + case IPPROTO_DSTOPTS: + case IPPROTO_MH: + return 1; + default: + return 0; + } +} +/* + * According to https://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml + * we suspect that there are would be no more than 11 extensions in IPv6 header, + * also there is 27 TLV options for Destination and Hop-by-hop extensions. + * Need to choose reasonable amount of maximum extensions/options we may check to find + * ext src/dst. + */ +#define IP6_EXTENSIONS_COUNT 11 +#define IP6_OPTIONS_COUNT 30 + +static inline int parse_ipv6_ext(struct __sk_buff *skb, + struct packet_hash_info_t *info, + __u8 *l4_protocol, size_t *l4_offset) +{ + int err = 0; + + if (!ip6_extension_header_type(*l4_protocol)) { + return 0; + } + + struct ipv6_opt_hdr ext_hdr = {}; + + for (unsigned int i = 0; i < IP6_EXTENSIONS_COUNT; ++i) { + + err = bpf_skb_load_bytes_relative(skb, *l4_offset, &ext_hdr, + sizeof(ext_hdr), BPF_HDR_START_NET); + if (err) { + goto error; + } + + if (*l4_protocol == IPPROTO_ROUTING) { + struct ipv6_rt_hdr ext_rt = {}; + + err = bpf_skb_load_bytes_relative(skb, *l4_offset, &ext_rt, + sizeof(ext_rt), BPF_HDR_START_NET); + if (err) { + goto error; + } + + if ((ext_rt.type == IPV6_SRCRT_TYPE_2) && + (ext_rt.hdrlen == sizeof(struct in6_addr) / 8) && + (ext_rt.segments_left == 1)) { + + err = bpf_skb_load_bytes_relative(skb, + *l4_offset + offsetof(struct rt2_hdr, addr), + &info->in6_ext_dst, sizeof(info->in6_ext_dst), + BPF_HDR_START_NET); + if (err) { + goto error; + } + + info->is_ipv6_ext_dst = 1; + } + + } else if (*l4_protocol == IPPROTO_DSTOPTS) { + struct ipv6_opt_t { + __u8 type; + __u8 length; + } __attribute__((packed)) opt = {}; + + size_t opt_offset = sizeof(ext_hdr); + + for (unsigned int j = 0; j < IP6_OPTIONS_COUNT; ++j) { + err = bpf_skb_load_bytes_relative(skb, *l4_offset + opt_offset, + &opt, sizeof(opt), BPF_HDR_START_NET); + if (err) { + goto error; + } + + if (opt.type == IPV6_TLV_HAO) { + err = bpf_skb_load_bytes_relative(skb, + *l4_offset + opt_offset + offsetof(struct ipv6_destopt_hao, addr), + &info->in6_ext_src, sizeof(info->in6_ext_src), + BPF_HDR_START_NET); + if (err) { + goto error; + } + + info->is_ipv6_ext_src = 1; + break; + } + + opt_offset += (opt.type == IPV6_TLV_PAD1) ? + 1 : opt.length + sizeof(opt); + + if (opt_offset + 1 >= ext_hdr.hdrlen * 8) { + break; + } + } + } else if (*l4_protocol == IPPROTO_FRAGMENT) { + info->is_fragmented = true; + } + + *l4_protocol = ext_hdr.nexthdr; + *l4_offset += (ext_hdr.hdrlen + 1) * 8; + + if (!ip6_extension_header_type(ext_hdr.nexthdr)) { + return 0; + } + } + + return 0; +error: + return err; +} + +static __be16 parse_eth_type(struct __sk_buff *skb) +{ + unsigned int offset = 12; + __be16 ret = 0; + int err = 0; + + err = bpf_skb_load_bytes_relative(skb, offset, &ret, sizeof(ret), + BPF_HDR_START_MAC); + if (err) { + return 0; + } + + switch (bpf_ntohs(ret)) { + case ETH_P_8021AD: + offset += 4; + case ETH_P_8021Q: + offset += 4; + err = bpf_skb_load_bytes_relative(skb, offset, &ret, sizeof(ret), + BPF_HDR_START_MAC); + default: + break; + } + + if (err) { + return 0; + } + + return ret; +} + +static inline int parse_packet(struct __sk_buff *skb, + struct packet_hash_info_t *info) +{ + int err = 0; + + if (!info || !skb) { + return -1; + } + + size_t l4_offset = 0; + __u8 l4_protocol = 0; + __u16 l3_protocol = bpf_ntohs(parse_eth_type(skb)); + if (l3_protocol == 0) { + err = -1; + goto error; + } + + if (l3_protocol == ETH_P_IP) { + info->is_ipv4 = 1; + + struct iphdr ip = {}; + err = bpf_skb_load_bytes_relative(skb, 0, &ip, sizeof(ip), + BPF_HDR_START_NET); + if (err) { + goto error; + } + + info->in_src = ip.saddr; + info->in_dst = ip.daddr; + info->is_fragmented = !!ip.frag_off; + + l4_protocol = ip.protocol; + l4_offset = ip.ihl * 4; + } else if (l3_protocol == ETH_P_IPV6) { + info->is_ipv6 = 1; + + struct ipv6hdr ip6 = {}; + err = bpf_skb_load_bytes_relative(skb, 0, &ip6, sizeof(ip6), + BPF_HDR_START_NET); + if (err) { + goto error; + } + + info->in6_src = ip6.saddr; + info->in6_dst = ip6.daddr; + + l4_protocol = ip6.nexthdr; + l4_offset = sizeof(ip6); + + err = parse_ipv6_ext(skb, info, &l4_protocol, &l4_offset); + if (err) { + goto error; + } + } + + if (l4_protocol != 0 && !info->is_fragmented) { + if (l4_protocol == IPPROTO_TCP) { + info->is_tcp = 1; + + struct tcphdr tcp = {}; + err = bpf_skb_load_bytes_relative(skb, l4_offset, &tcp, sizeof(tcp), + BPF_HDR_START_NET); + if (err) { + goto error; + } + + info->src_port = tcp.source; + info->dst_port = tcp.dest; + } else if (l4_protocol == IPPROTO_UDP) { /* TODO: add udplite? */ + info->is_udp = 1; + + struct udphdr udp = {}; + err = bpf_skb_load_bytes_relative(skb, l4_offset, &udp, sizeof(udp), + BPF_HDR_START_NET); + if (err) { + goto error; + } + + info->src_port = udp.source; + info->dst_port = udp.dest; + } + } + + return 0; + +error: + return err; +} + +static inline __u32 calculate_rss_hash(struct __sk_buff *skb, + struct rss_config_t *config, struct toeplitz_key_data_t *toe) +{ + __u8 rss_input[HASH_CALCULATION_BUFFER_SIZE] = {}; + size_t bytes_written = 0; + __u32 result = 0; + int err = 0; + struct packet_hash_info_t packet_info = {}; + + err = parse_packet(skb, &packet_info); + if (err) { + return 0; + } + + if (packet_info.is_ipv4) { + if (packet_info.is_tcp && + config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) { + + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in_src, + sizeof(packet_info.in_src)); + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in_dst, + sizeof(packet_info.in_dst)); + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.src_port, + sizeof(packet_info.src_port)); + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.dst_port, + sizeof(packet_info.dst_port)); + } else if (packet_info.is_udp && + config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) { + + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in_src, + sizeof(packet_info.in_src)); + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in_dst, + sizeof(packet_info.in_dst)); + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.src_port, + sizeof(packet_info.src_port)); + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.dst_port, + sizeof(packet_info.dst_port)); + } else if (config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in_src, + sizeof(packet_info.in_src)); + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in_dst, + sizeof(packet_info.in_dst)); + } + } else if (packet_info.is_ipv6) { + if (packet_info.is_tcp && + config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) { + + if (packet_info.is_ipv6_ext_src && + config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_TCP_EX) { + + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in6_ext_src, + sizeof(packet_info.in6_ext_src)); + } else { + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in6_src, + sizeof(packet_info.in6_src)); + } + if (packet_info.is_ipv6_ext_dst && + config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_TCP_EX) { + + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in6_ext_dst, + sizeof(packet_info.in6_ext_dst)); + } else { + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in6_dst, + sizeof(packet_info.in6_dst)); + } + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.src_port, + sizeof(packet_info.src_port)); + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.dst_port, + sizeof(packet_info.dst_port)); + } else if (packet_info.is_udp && + config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) { + + if (packet_info.is_ipv6_ext_src && + config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_UDP_EX) { + + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in6_ext_src, + sizeof(packet_info.in6_ext_src)); + } else { + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in6_src, + sizeof(packet_info.in6_src)); + } + if (packet_info.is_ipv6_ext_dst && + config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_UDP_EX) { + + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in6_ext_dst, + sizeof(packet_info.in6_ext_dst)); + } else { + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in6_dst, + sizeof(packet_info.in6_dst)); + } + + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.src_port, + sizeof(packet_info.src_port)); + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.dst_port, + sizeof(packet_info.dst_port)); + + } else if (config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_IPv6) { + if (packet_info.is_ipv6_ext_src && + config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_IP_EX) { + + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in6_ext_src, + sizeof(packet_info.in6_ext_src)); + } else { + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in6_src, + sizeof(packet_info.in6_src)); + } + if (packet_info.is_ipv6_ext_dst && + config->hash_types & VIRTIO_NET_RSS_HASH_TYPE_IP_EX) { + + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in6_ext_dst, + sizeof(packet_info.in6_ext_dst)); + } else { + net_rx_rss_add_chunk(rss_input, &bytes_written, + &packet_info.in6_dst, + sizeof(packet_info.in6_dst)); + } + } + } + + if (bytes_written) { + net_toeplitz_add(&result, rss_input, bytes_written, toe); + } + + return result; +} + +SEC("tun_rss_steering") +int tun_rss_steering_prog(struct __sk_buff *skb) +{ + + struct rss_config_t *config; + struct toeplitz_key_data_t *toe; + + __u32 key = 0; + __u32 hash = 0; + + config = bpf_map_lookup_elem(&tap_rss_map_configurations, &key); + toe = bpf_map_lookup_elem(&tap_rss_map_toeplitz_key, &key); + + if (config && toe) { + if (!config->redirect) { + return config->default_queue; + } + + hash = calculate_rss_hash(skb, config, toe); + if (hash) { + __u32 table_idx = hash % config->indirections_len; + __u16 *queue = 0; + + queue = bpf_map_lookup_elem(&tap_rss_map_indirection_table, + &table_idx); + + if (queue) { + return *queue; + } + } + + return config->default_queue; + } + + return -1; +} + +char _license[] SEC("license") = "GPL v2"; 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Wed, 28 Apr 2021 09:47:46 -0700 (PDT) Received: from navi.cosmonova.net.ua ([95.67.24.131]) by smtp.gmail.com with ESMTPSA id v24sm86302lfp.195.2021.04.28.09.47.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Apr 2021 09:47:46 -0700 (PDT) From: Andrew Melnychenko To: jasowang@redhat.com, mst@redhat.com Subject: [PATCH v7 4/7] ebpf: Added eBPF RSS loader. Date: Wed, 28 Apr 2021 19:47:30 +0300 Message-Id: <20210428164733.56547-5-andrew@daynix.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210428164733.56547-1-andrew@daynix.com> References: <20210428164733.56547-1-andrew@daynix.com> MIME-Version: 1.0 Received-SPF: none client-ip=2a00:1450:4864:20::12e; envelope-from=andrew@daynix.com; helo=mail-lf1-x12e.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: yan@daynix.com, yuri.benditovich@daynix.com, berrange@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Added function that loads RSS eBPF program. Added stub functions for RSS eBPF loader. Added meson and configuration options. By default, eBPF feature enabled if libbpf is present in the build system. libbpf checked in configuration shell script and meson script. Signed-off-by: Yuri Benditovich Signed-off-by: Andrew Melnychenko --- configure | 8 +- ebpf/ebpf_rss-stub.c | 40 ++++ ebpf/ebpf_rss.c | 165 +++++++++++++++ ebpf/ebpf_rss.h | 44 ++++ ebpf/meson.build | 1 + ebpf/rss.bpf.skeleton.h | 431 ++++++++++++++++++++++++++++++++++++++++ ebpf/trace-events | 4 + ebpf/trace.h | 2 + meson.build | 23 +++ meson_options.txt | 2 + 10 files changed, 719 insertions(+), 1 deletion(-) create mode 100644 ebpf/ebpf_rss-stub.c create mode 100644 ebpf/ebpf_rss.c create mode 100644 ebpf/ebpf_rss.h create mode 100644 ebpf/meson.build create mode 100644 ebpf/rss.bpf.skeleton.h create mode 100644 ebpf/trace-events create mode 100644 ebpf/trace.h diff --git a/configure b/configure index 4f374b4889..7d9e0391a0 100755 --- a/configure +++ b/configure @@ -348,6 +348,7 @@ vhost_vsock="$default_feature" vhost_user="no" vhost_user_blk_server="auto" vhost_user_fs="$default_feature" +bpf="auto" kvm="auto" hax="auto" hvf="auto" @@ -1228,6 +1229,10 @@ for opt do ;; --enable-membarrier) membarrier="yes" ;; + --disable-bpf) bpf="disabled" + ;; + --enable-bpf) bpf="enabled" + ;; --disable-blobs) blobs="false" ;; --with-pkgversion=*) pkgversion="$optarg" @@ -1865,6 +1870,7 @@ disabled with --disable-FEATURE, default is enabled if available vhost-user vhost-user backend support vhost-user-blk-server vhost-user-blk server support vhost-vdpa vhost-vdpa kernel backend support + bpf BPF kernel support spice spice rbd rados block device (rbd) libiscsi iscsi support @@ -6423,7 +6429,7 @@ NINJA=$ninja $meson setup \ -Dattr=$attr -Ddefault_devices=$default_devices \ -Ddocs=$docs -Dsphinx_build=$sphinx_build -Dinstall_blobs=$blobs \ -Dvhost_user_blk_server=$vhost_user_blk_server -Dmultiprocess=$multiprocess \ - -Dfuse=$fuse -Dfuse_lseek=$fuse_lseek -Dguest_agent_msi=$guest_agent_msi \ + -Dfuse=$fuse -Dfuse_lseek=$fuse_lseek -Dguest_agent_msi=$guest_agent_msi -Dbpf=$bpf\ $(if test "$default_features" = no; then echo "-Dauto_features=disabled"; fi) \ -Dtcg_interpreter=$tcg_interpreter \ $cross_arg \ diff --git a/ebpf/ebpf_rss-stub.c b/ebpf/ebpf_rss-stub.c new file mode 100644 index 0000000000..e71e229190 --- /dev/null +++ b/ebpf/ebpf_rss-stub.c @@ -0,0 +1,40 @@ +/* + * eBPF RSS stub file + * + * Developed by Daynix Computing LTD (http://www.daynix.com) + * + * Authors: + * Yuri Benditovich + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "ebpf/ebpf_rss.h" + +void ebpf_rss_init(struct EBPFRSSContext *ctx) +{ + +} + +bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx) +{ + return false; +} + +bool ebpf_rss_load(struct EBPFRSSContext *ctx) +{ + return false; +} + +bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config, + uint16_t *indirections_table, uint8_t *toeplitz_key) +{ + return false; +} + +void ebpf_rss_unload(struct EBPFRSSContext *ctx) +{ + +} diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c new file mode 100644 index 0000000000..118c68da83 --- /dev/null +++ b/ebpf/ebpf_rss.c @@ -0,0 +1,165 @@ +/* + * eBPF RSS loader + * + * Developed by Daynix Computing LTD (http://www.daynix.com) + * + * Authors: + * Andrew Melnychenko + * Yuri Benditovich + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "qemu/error-report.h" + +#include +#include + +#include "hw/virtio/virtio-net.h" /* VIRTIO_NET_RSS_MAX_TABLE_LEN */ + +#include "ebpf/ebpf_rss.h" +#include "ebpf/rss.bpf.skeleton.h" +#include "trace.h" + +void ebpf_rss_init(struct EBPFRSSContext *ctx) +{ + if (ctx != NULL) { + ctx->obj = NULL; + } +} + +bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx) +{ + return ctx != NULL && ctx->obj != NULL; +} + +bool ebpf_rss_load(struct EBPFRSSContext *ctx) +{ + struct rss_bpf *rss_bpf_ctx; + + if (ctx == NULL) { + return false; + } + + rss_bpf_ctx = rss_bpf__open(); + if (rss_bpf_ctx == NULL) { + trace_ebpf_error("eBPF RSS", "can not open eBPF RSS object"); + goto error; + } + + bpf_program__set_socket_filter(rss_bpf_ctx->progs.tun_rss_steering_prog); + + if (rss_bpf__load(rss_bpf_ctx)) { + trace_ebpf_error("eBPF RSS", "can not load RSS program"); + goto error; + } + + ctx->obj = rss_bpf_ctx; + ctx->program_fd = bpf_program__fd( + rss_bpf_ctx->progs.tun_rss_steering_prog); + ctx->map_configuration = bpf_map__fd( + rss_bpf_ctx->maps.tap_rss_map_configurations); + ctx->map_indirections_table = bpf_map__fd( + rss_bpf_ctx->maps.tap_rss_map_indirection_table); + ctx->map_toeplitz_key = bpf_map__fd( + rss_bpf_ctx->maps.tap_rss_map_toeplitz_key); + + return true; +error: + rss_bpf__destroy(rss_bpf_ctx); + ctx->obj = NULL; + + return false; +} + +static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx, + struct EBPFRSSConfig *config) +{ + uint32_t map_key = 0; + + if (!ebpf_rss_is_loaded(ctx)) { + return false; + } + if (bpf_map_update_elem(ctx->map_configuration, + &map_key, config, 0) < 0) { + return false; + } + return true; +} + +static bool ebpf_rss_set_indirections_table(struct EBPFRSSContext *ctx, + uint16_t *indirections_table, + size_t len) +{ + uint32_t i = 0; + + if (!ebpf_rss_is_loaded(ctx) || indirections_table == NULL || + len > VIRTIO_NET_RSS_MAX_TABLE_LEN) { + return false; + } + + for (; i < len; ++i) { + if (bpf_map_update_elem(ctx->map_indirections_table, &i, + indirections_table + i, 0) < 0) { + return false; + } + } + return true; +} + +static bool ebpf_rss_set_toepliz_key(struct EBPFRSSContext *ctx, + uint8_t *toeplitz_key) +{ + uint32_t map_key = 0; + + /* prepare toeplitz key */ + uint8_t toe[VIRTIO_NET_RSS_MAX_KEY_SIZE] = {}; + + if (!ebpf_rss_is_loaded(ctx) || toeplitz_key == NULL) { + return false; + } + memcpy(toe, toeplitz_key, VIRTIO_NET_RSS_MAX_KEY_SIZE); + *(uint32_t *)toe = ntohl(*(uint32_t *)toe); + + if (bpf_map_update_elem(ctx->map_toeplitz_key, &map_key, toe, + 0) < 0) { + return false; + } + return true; +} + +bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config, + uint16_t *indirections_table, uint8_t *toeplitz_key) +{ + if (!ebpf_rss_is_loaded(ctx) || config == NULL || + indirections_table == NULL || toeplitz_key == NULL) { + return false; + } + + if (!ebpf_rss_set_config(ctx, config)) { + return false; + } + + if (!ebpf_rss_set_indirections_table(ctx, indirections_table, + config->indirections_len)) { + return false; + } + + if (!ebpf_rss_set_toepliz_key(ctx, toeplitz_key)) { + return false; + } + + return true; +} + +void ebpf_rss_unload(struct EBPFRSSContext *ctx) +{ + if (!ebpf_rss_is_loaded(ctx)) { + return; + } + + rss_bpf__destroy(ctx->obj); + ctx->obj = NULL; +} diff --git a/ebpf/ebpf_rss.h b/ebpf/ebpf_rss.h new file mode 100644 index 0000000000..bf3f2572c7 --- /dev/null +++ b/ebpf/ebpf_rss.h @@ -0,0 +1,44 @@ +/* + * eBPF RSS header + * + * Developed by Daynix Computing LTD (http://www.daynix.com) + * + * Authors: + * Andrew Melnychenko + * Yuri Benditovich + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + */ + +#ifndef QEMU_EBPF_RSS_H +#define QEMU_EBPF_RSS_H + +struct EBPFRSSContext { + void *obj; + int program_fd; + int map_configuration; + int map_toeplitz_key; + int map_indirections_table; +}; + +struct EBPFRSSConfig { + uint8_t redirect; + uint8_t populate_hash; + uint32_t hash_types; + uint16_t indirections_len; + uint16_t default_queue; +} __attribute__((packed)); + +void ebpf_rss_init(struct EBPFRSSContext *ctx); + +bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx); + +bool ebpf_rss_load(struct EBPFRSSContext *ctx); + +bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config, + uint16_t *indirections_table, uint8_t *toeplitz_key); + +void ebpf_rss_unload(struct EBPFRSSContext *ctx); + +#endif /* QEMU_EBPF_RSS_H */ diff --git a/ebpf/meson.build b/ebpf/meson.build new file mode 100644 index 0000000000..9cd0635370 --- /dev/null +++ b/ebpf/meson.build @@ -0,0 +1 @@ +common_ss.add(when: libbpf, if_true: files('ebpf_rss.c'), if_false: files('ebpf_rss-stub.c')) diff --git a/ebpf/rss.bpf.skeleton.h b/ebpf/rss.bpf.skeleton.h new file mode 100644 index 0000000000..126683eb87 --- /dev/null +++ b/ebpf/rss.bpf.skeleton.h @@ -0,0 +1,431 @@ +/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ + +/* THIS FILE IS AUTOGENERATED! */ +#ifndef __RSS_BPF_SKEL_H__ +#define __RSS_BPF_SKEL_H__ + +#include +#include + +struct rss_bpf { + struct bpf_object_skeleton *skeleton; + struct bpf_object *obj; + struct { + struct bpf_map *tap_rss_map_configurations; + struct bpf_map *tap_rss_map_indirection_table; + struct bpf_map *tap_rss_map_toeplitz_key; + } maps; + struct { + struct bpf_program *tun_rss_steering_prog; + } progs; + struct { + struct bpf_link *tun_rss_steering_prog; + } links; +}; + +static void +rss_bpf__destroy(struct rss_bpf *obj) +{ + if (!obj) + return; + if (obj->skeleton) + bpf_object__destroy_skeleton(obj->skeleton); + free(obj); +} + +static inline int +rss_bpf__create_skeleton(struct rss_bpf *obj); + +static inline struct rss_bpf * +rss_bpf__open_opts(const struct bpf_object_open_opts *opts) +{ + struct rss_bpf *obj; + + obj = (struct rss_bpf *)calloc(1, sizeof(*obj)); + if (!obj) + return NULL; + if (rss_bpf__create_skeleton(obj)) + goto err; + if (bpf_object__open_skeleton(obj->skeleton, opts)) + goto err; + + return obj; +err: + rss_bpf__destroy(obj); + return NULL; +} + +static inline struct rss_bpf * +rss_bpf__open(void) +{ + return rss_bpf__open_opts(NULL); +} + +static inline int +rss_bpf__load(struct rss_bpf *obj) +{ + return bpf_object__load_skeleton(obj->skeleton); +} + +static inline struct rss_bpf * +rss_bpf__open_and_load(void) +{ + struct rss_bpf *obj; + + obj = rss_bpf__open(); + if (!obj) + return NULL; + if (rss_bpf__load(obj)) { + rss_bpf__destroy(obj); + return NULL; + } + return obj; +} + +static inline int +rss_bpf__attach(struct rss_bpf *obj) +{ + return bpf_object__attach_skeleton(obj->skeleton); +} + +static inline void +rss_bpf__detach(struct rss_bpf *obj) +{ + return bpf_object__detach_skeleton(obj->skeleton); +} + +static inline int +rss_bpf__create_skeleton(struct rss_bpf *obj) +{ + struct bpf_object_skeleton *s; + + s = (struct bpf_object_skeleton *)calloc(1, sizeof(*s)); + if (!s) + return -1; + obj->skeleton = s; + + s->sz = sizeof(*s); + s->name = "rss_bpf"; + s->obj = &obj->obj; + + /* maps */ + s->map_cnt = 3; + s->map_skel_sz = sizeof(*s->maps); + s->maps = (struct bpf_map_skeleton *)calloc(s->map_cnt, s->map_skel_sz); + if (!s->maps) + goto err; + + s->maps[0].name = "tap_rss_map_configurations"; + s->maps[0].map = &obj->maps.tap_rss_map_configurations; + + s->maps[1].name = "tap_rss_map_indirection_table"; + s->maps[1].map = &obj->maps.tap_rss_map_indirection_table; + + s->maps[2].name = "tap_rss_map_toeplitz_key"; + s->maps[2].map = &obj->maps.tap_rss_map_toeplitz_key; + + /* programs */ + s->prog_cnt = 1; + s->prog_skel_sz = sizeof(*s->progs); + s->progs = (struct bpf_prog_skeleton *)calloc(s->prog_cnt, s->prog_skel_sz); + if (!s->progs) + goto err; + + s->progs[0].name = "tun_rss_steering_prog"; + s->progs[0].prog = &obj->progs.tun_rss_steering_prog; + s->progs[0].link = &obj->links.tun_rss_steering_prog; + + s->data_sz = 8088; + s->data = (void *)"\ +\x7f\x45\x4c\x46\x02\x01\x01\0\0\0\0\0\0\0\0\0\x01\0\xf7\0\x01\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\x18\x1d\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\x40\0\x0a\0\ +\x01\0\xbf\x18\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x63\x1a\x4c\xff\0\0\0\0\xbf\xa7\ +\0\0\0\0\0\0\x07\x07\0\0\x4c\xff\xff\xff\x18\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x06\0\0\0\0\0\0\x18\x01\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\xbf\x72\0\0\0\0\0\0\x85\0\0\0\x01\0\0\0\xbf\x07\0\0\0\0\0\0\ +\x18\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\x15\x06\x66\x02\0\0\0\0\xbf\x79\0\0\ +\0\0\0\0\x15\x09\x64\x02\0\0\0\0\x71\x61\0\0\0\0\0\0\x55\x01\x01\0\0\0\0\0\x05\ 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+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x56\0\0\0\x09\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\x60\x1a\0\0\0\0\0\0\x30\0\0\0\0\0\0\0\x09\0\0\0\x03\0\0\0\x08\0\0\0\0\0\0\0\ +\x10\0\0\0\0\0\0\0\x20\0\0\0\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x18\ +\x14\0\0\0\0\0\0\x3c\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\ +\0\0\0\x6c\0\0\0\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x54\x14\0\0\0\0\0\ +\0\x07\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x78\0\0\ +\0\x01\0\0\0\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x60\x14\0\0\0\0\0\0\x30\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\x08\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x74\0\0\0\x09\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x90\x1a\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x09\0\0\0\ +\x07\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\xb2\0\0\0\x02\0\0\0\0\0\0\0\0\0\ +\0\0\0\0\0\0\0\0\0\0\x90\x14\0\0\0\0\0\0\xd0\x05\0\0\0\0\0\0\x01\0\0\0\x39\0\0\ +\0\x08\0\0\0\0\0\0\0\x18\0\0\0\0\0\0\0"; + + return 0; +err: + bpf_object__destroy_skeleton(s); + return -1; +} + +#endif /* __RSS_BPF_SKEL_H__ */ diff --git a/ebpf/trace-events b/ebpf/trace-events new file mode 100644 index 0000000000..411b1e2be3 --- /dev/null +++ b/ebpf/trace-events @@ -0,0 +1,4 @@ +# See docs/devel/tracing.txt for syntax documentation. + +# ebpf-rss.c +ebpf_error(const char *s1, const char *s2) "error in %s: %s" diff --git a/ebpf/trace.h b/ebpf/trace.h new file mode 100644 index 0000000000..ad570e6691 --- /dev/null +++ b/ebpf/trace.h @@ -0,0 +1,2 @@ +#include "trace/trace-ebpf.h" + diff --git a/meson.build b/meson.build index c6f4b0cf5e..4a51a25643 100644 --- a/meson.build +++ b/meson.build @@ -1016,6 +1016,23 @@ if not get_option('fuse_lseek').disabled() endif endif +# libbpf +libbpf = dependency('libbpf', required: get_option('bpf')) +if libbpf.found() and not cc.links(''' + #include + int main(void) + { + bpf_object__destroy_skeleton(NULL); + return 0; + }''', dependencies: libbpf) + libbpf = not_found + if get_option('bpf').enabled() + error('libbpf skeleton test failed') + else + warning('libbpf skeleton test failed, disabling') + endif +endif + if get_option('cfi') cfi_flags=[] # Check for dependency on LTO @@ -1115,6 +1132,7 @@ endif config_host_data.set('CONFIG_GTK', gtk.found()) config_host_data.set('CONFIG_LIBATTR', have_old_libattr) config_host_data.set('CONFIG_LIBCAP_NG', libcap_ng.found()) +config_host_data.set('CONFIG_EBPF', libbpf.found()) config_host_data.set('CONFIG_LIBISCSI', libiscsi.found()) config_host_data.set('CONFIG_LIBNFS', libnfs.found()) config_host_data.set('CONFIG_RBD', rbd.found()) @@ -1785,6 +1803,7 @@ if have_system 'backends', 'backends/tpm', 'chardev', + 'ebpf', 'hw/9pfs', 'hw/acpi', 'hw/adc', @@ -1976,6 +1995,9 @@ subdir('accel') subdir('plugins') subdir('bsd-user') subdir('linux-user') +subdir('ebpf') + +common_ss.add(libbpf) bsd_user_ss.add(files('gdbstub.c')) specific_ss.add_all(when: 'CONFIG_BSD_USER', if_true: bsd_user_ss) @@ -2680,6 +2702,7 @@ summary_info += {'RDMA support': config_host.has_key('CONFIG_RDMA')} summary_info += {'PVRDMA support': config_host.has_key('CONFIG_PVRDMA')} summary_info += {'fdt support': fdt_opt == 'disabled' ? false : fdt_opt} summary_info += {'libcap-ng support': libcap_ng.found()} +summary_info += {'bpf support': libbpf.found()} # TODO: add back protocol and server version summary_info += {'spice support': config_host.has_key('CONFIG_SPICE')} summary_info += {'rbd support': rbd.found()} diff --git a/meson_options.txt b/meson_options.txt index 9734019995..58bc80ecfb 100644 --- a/meson_options.txt +++ b/meson_options.txt @@ -56,6 +56,8 @@ option('bzip2', type : 'feature', value : 'auto', description: 'bzip2 support for DMG images') option('cap_ng', type : 'feature', value : 'auto', description: 'cap_ng support') +option('bpf', type : 'feature', value : 'auto', + description: 'eBPF support') option('cocoa', type : 'feature', value : 'auto', description: 'Cocoa user interface (macOS only)') option('curl', type : 'feature', value : 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Date: Wed, 28 Apr 2021 19:47:31 +0300 Message-Id: <20210428164733.56547-6-andrew@daynix.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210428164733.56547-1-andrew@daynix.com> References: <20210428164733.56547-1-andrew@daynix.com> MIME-Version: 1.0 Received-SPF: none client-ip=2a00:1450:4864:20::22a; envelope-from=andrew@daynix.com; helo=mail-lj1-x22a.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: yan@daynix.com, yuri.benditovich@daynix.com, berrange@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" When RSS is enabled the device tries to load the eBPF program to select RX virtqueue in the TUN. If eBPF can be loaded the RSS will function also with vhost (works with kernel 5.8 and later). Software RSS is used as a fallback with vhost=off when eBPF can't be loaded or when hash population requested by the guest. Signed-off-by: Yuri Benditovich Signed-off-by: Andrew Melnychenko --- hw/net/vhost_net.c | 3 + hw/net/virtio-net.c | 115 ++++++++++++++++++++++++++++++++- include/hw/virtio/virtio-net.h | 4 ++ net/vhost-vdpa.c | 2 + 4 files changed, 121 insertions(+), 3 deletions(-) diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c index 24d555e764..44c1ed92dc 100644 --- a/hw/net/vhost_net.c +++ b/hw/net/vhost_net.c @@ -45,6 +45,7 @@ static const int kernel_feature_bits[] = { VIRTIO_NET_F_MTU, VIRTIO_F_IOMMU_PLATFORM, VIRTIO_F_RING_PACKED, + VIRTIO_NET_F_HASH_REPORT, VHOST_INVALID_FEATURE_BIT }; @@ -71,6 +72,8 @@ static const int user_feature_bits[] = { VIRTIO_NET_F_MTU, VIRTIO_F_IOMMU_PLATFORM, VIRTIO_F_RING_PACKED, + VIRTIO_NET_F_RSS, + VIRTIO_NET_F_HASH_REPORT, /* This bit implies RARP isn't sent by QEMU out of band */ VIRTIO_NET_F_GUEST_ANNOUNCE, diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index 66b9ff4511..7ed11a303b 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -737,8 +737,9 @@ static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features, return features; } - virtio_clear_feature(&features, VIRTIO_NET_F_RSS); - virtio_clear_feature(&features, VIRTIO_NET_F_HASH_REPORT); + if (!ebpf_rss_is_loaded(&n->ebpf_rss)) { + virtio_clear_feature(&features, VIRTIO_NET_F_RSS); + } features = vhost_net_get_features(get_vhost_net(nc->peer), features); vdev->backend_features = features; @@ -1163,12 +1164,79 @@ static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd, } } +static void virtio_net_detach_epbf_rss(VirtIONet *n); + static void virtio_net_disable_rss(VirtIONet *n) { if (n->rss_data.enabled) { trace_virtio_net_rss_disable(); } n->rss_data.enabled = false; + + virtio_net_detach_epbf_rss(n); +} + +static bool virtio_net_attach_ebpf_to_backend(NICState *nic, int prog_fd) +{ + NetClientState *nc = qemu_get_peer(qemu_get_queue(nic), 0); + if (nc == NULL || nc->info->set_steering_ebpf == NULL) { + return false; + } + + return nc->info->set_steering_ebpf(nc, prog_fd); +} + +static void rss_data_to_rss_config(struct VirtioNetRssData *data, + struct EBPFRSSConfig *config) +{ + config->redirect = data->redirect; + config->populate_hash = data->populate_hash; + config->hash_types = data->hash_types; + config->indirections_len = data->indirections_len; + config->default_queue = data->default_queue; +} + +static bool virtio_net_attach_epbf_rss(VirtIONet *n) +{ + struct EBPFRSSConfig config = {}; + + if (!ebpf_rss_is_loaded(&n->ebpf_rss)) { + return false; + } + + rss_data_to_rss_config(&n->rss_data, &config); + + if (!ebpf_rss_set_all(&n->ebpf_rss, &config, + n->rss_data.indirections_table, n->rss_data.key)) { + return false; + } + + if (!virtio_net_attach_ebpf_to_backend(n->nic, n->ebpf_rss.program_fd)) { + return false; + } + + return true; +} + +static void virtio_net_detach_epbf_rss(VirtIONet *n) +{ + virtio_net_attach_ebpf_to_backend(n->nic, -1); +} + +static bool virtio_net_load_ebpf(VirtIONet *n) +{ + if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) { + /* backend does't support steering ebpf */ + return false; + } + + return ebpf_rss_load(&n->ebpf_rss); +} + +static void virtio_net_unload_ebpf(VirtIONet *n) +{ + virtio_net_attach_ebpf_to_backend(n->nic, -1); + ebpf_rss_unload(&n->ebpf_rss); } static uint16_t virtio_net_handle_rss(VirtIONet *n, @@ -1283,6 +1351,25 @@ static uint16_t virtio_net_handle_rss(VirtIONet *n, goto error; } n->rss_data.enabled = true; + + if (!n->rss_data.populate_hash) { + if (!virtio_net_attach_epbf_rss(n)) { + /* EBPF must be loaded for vhost */ + if (get_vhost_net(qemu_get_queue(n->nic)->peer)) { + warn_report("Can't load eBPF RSS for vhost"); + goto error; + } + /* fallback to software RSS */ + warn_report("Can't load eBPF RSS - fallback to software RSS"); + n->rss_data.enabled_software_rss = true; + } + } else { + /* use software RSS for hash populating */ + /* and detach eBPF if was loaded before */ + virtio_net_detach_epbf_rss(n); + n->rss_data.enabled_software_rss = true; + } + trace_virtio_net_rss_enable(n->rss_data.hash_types, n->rss_data.indirections_len, temp.b); @@ -1668,7 +1755,7 @@ static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf, return -1; } - if (!no_rss && n->rss_data.enabled) { + if (!no_rss && n->rss_data.enabled && n->rss_data.enabled_software_rss) { int index = virtio_net_process_rss(nc, buf, size); if (index >= 0) { NetClientState *nc2 = qemu_get_subqueue(n->nic, index); @@ -2772,6 +2859,18 @@ static int virtio_net_post_load_device(void *opaque, int version_id) } if (n->rss_data.enabled) { + n->rss_data.enabled_software_rss = n->rss_data.populate_hash; + if (!n->rss_data.populate_hash) { + if (!virtio_net_attach_epbf_rss(n)) { + if (get_vhost_net(qemu_get_queue(n->nic)->peer)) { + warn_report("Can't post-load eBPF RSS for vhost"); + } else { + warn_report("Can't post-load eBPF RSS - fallback to software RSS"); + n->rss_data.enabled_software_rss = true; + } + } + } + trace_virtio_net_rss_enable(n->rss_data.hash_types, n->rss_data.indirections_len, sizeof(n->rss_data.key)); @@ -3352,6 +3451,10 @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp) n->qdev = dev; net_rx_pkt_init(&n->rx_pkt, false); + + if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) { + virtio_net_load_ebpf(n); + } } static void virtio_net_device_unrealize(DeviceState *dev) @@ -3360,6 +3463,10 @@ static void virtio_net_device_unrealize(DeviceState *dev) VirtIONet *n = VIRTIO_NET(dev); int i, max_queues; + if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) { + virtio_net_unload_ebpf(n); + } + /* This will stop vhost backend if appropriate. */ virtio_net_set_status(vdev, 0); @@ -3402,6 +3509,8 @@ static void virtio_net_instance_init(Object *obj) device_add_bootindex_property(obj, &n->nic_conf.bootindex, "bootindex", "/ethernet-phy@0", DEVICE(n)); + + ebpf_rss_init(&n->ebpf_rss); } static int virtio_net_pre_save(void *opaque) diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h index 7e96d193aa..824a69c23f 100644 --- a/include/hw/virtio/virtio-net.h +++ b/include/hw/virtio/virtio-net.h @@ -21,6 +21,8 @@ #include "qemu/option_int.h" #include "qom/object.h" +#include "ebpf/ebpf_rss.h" + #define TYPE_VIRTIO_NET "virtio-net-device" OBJECT_DECLARE_SIMPLE_TYPE(VirtIONet, VIRTIO_NET) @@ -130,6 +132,7 @@ typedef struct VirtioNetRscChain { typedef struct VirtioNetRssData { bool enabled; + bool enabled_software_rss; bool redirect; bool populate_hash; uint32_t hash_types; @@ -209,6 +212,7 @@ struct VirtIONet { Notifier migration_state; VirtioNetRssData rss_data; struct NetRxPkt *rx_pkt; + struct EBPFRSSContext ebpf_rss; }; void virtio_net_set_netclient_name(VirtIONet *n, const char *name, diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c index fe659ec9e2..8b14215549 100644 --- a/net/vhost-vdpa.c +++ b/net/vhost-vdpa.c @@ -54,6 +54,8 @@ const int vdpa_feature_bits[] = { VIRTIO_NET_F_MTU, VIRTIO_F_IOMMU_PLATFORM, VIRTIO_F_RING_PACKED, + VIRTIO_NET_F_RSS, + VIRTIO_NET_F_HASH_REPORT, VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_STATUS, VHOST_INVALID_FEATURE_BIT From patchwork Wed Apr 28 16:47:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Melnichenko X-Patchwork-Id: 1471326 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; 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Wed, 28 Apr 2021 09:47:48 -0700 (PDT) From: Andrew Melnychenko To: jasowang@redhat.com, mst@redhat.com Subject: [PATCH v7 6/7] docs: Added eBPF documentation. Date: Wed, 28 Apr 2021 19:47:32 +0300 Message-Id: <20210428164733.56547-7-andrew@daynix.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210428164733.56547-1-andrew@daynix.com> References: <20210428164733.56547-1-andrew@daynix.com> MIME-Version: 1.0 Received-SPF: none client-ip=2a00:1450:4864:20::135; envelope-from=andrew@daynix.com; helo=mail-lf1-x135.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: yan@daynix.com, yuri.benditovich@daynix.com, berrange@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Yuri Benditovich Signed-off-by: Andrew Melnychenko --- docs/devel/ebpf_rss.rst | 125 ++++++++++++++++++++++++++++++++++++++++ docs/devel/index.rst | 1 + 2 files changed, 126 insertions(+) create mode 100644 docs/devel/ebpf_rss.rst diff --git a/docs/devel/ebpf_rss.rst b/docs/devel/ebpf_rss.rst new file mode 100644 index 0000000000..e00962577a --- /dev/null +++ b/docs/devel/ebpf_rss.rst @@ -0,0 +1,125 @@ +=========================== +eBPF RSS virtio-net support +=========================== + +RSS(Receive Side Scaling) is used to distribute network packets to guest virtqueues +by calculating packet hash. Usually every queue is processed then by a specific guest CPU core. + +For now there are 2 RSS implementations in qemu: +- 'in-qemu' RSS (functions if qemu receives network packets, i.e. vhost=off) +- eBPF RSS (can function with also with vhost=on) + +eBPF support (CONFIG_EBPF) is enabled by 'configure' script. +To enable eBPF RSS support use './configure --enable-bpf'. + +If steering BPF is not set for kernel's TUN module, the TUN uses automatic selection +of rx virtqueue based on lookup table built according to calculated symmetric hash +of transmitted packets. +If steering BPF is set for TUN the BPF code calculates the hash of packet header and +returns the virtqueue number to place the packet to. + +Simplified decision formula: + +.. code:: C + + queue_index = indirection_table[hash()%] + + +Not for all packets, the hash can/should be calculated. + +Note: currently, eBPF RSS does not support hash reporting. + +eBPF RSS turned on by different combinations of vhost-net, vitrio-net and tap configurations: + +- eBPF is used: + + tap,vhost=off & virtio-net-pci,rss=on,hash=off + +- eBPF is used: + + tap,vhost=on & virtio-net-pci,rss=on,hash=off + +- 'in-qemu' RSS is used: + + tap,vhost=off & virtio-net-pci,rss=on,hash=on + +- eBPF is used, hash population feature is not reported to the guest: + + tap,vhost=on & virtio-net-pci,rss=on,hash=on + +If CONFIG_EBPF is not set then only 'in-qemu' RSS is supported. +Also 'in-qemu' RSS, as a fallback, is used if the eBPF program failed to load or set to TUN. + +RSS eBPF program +---------------- + +RSS program located in ebpf/rss.bpf.skeleton.h generated by bpftool. +So the program is part of the qemu binary. +Initially, the eBPF program was compiled by clang and source code located at tools/ebpf/rss.bpf.c. +Prerequisites to recompile the eBPF program (regenerate ebpf/rss.bpf.skeleton.h): + + llvm, clang, kernel source tree, bpftool + Adjust Makefile.ebpf to reflect the location of the kernel source tree + + $ cd tools/ebpf + $ make -f Makefile.ebpf + +Current eBPF RSS implementation uses 'bounded loops' with 'backward jump instructions' which present in the last kernels. +Overall eBPF RSS works on kernels 5.8+. + +eBPF RSS implementation +----------------------- + +eBPF RSS loading functionality located in ebpf/ebpf_rss.c and ebpf/ebpf_rss.h. + +The `struct EBPFRSSContext` structure that holds 4 file descriptors: + +- ctx - pointer of the libbpf context. +- program_fd - file descriptor of the eBPF RSS program. +- map_configuration - file descriptor of the 'configuration' map. This map contains one element of 'struct EBPFRSSConfig'. This configuration determines eBPF program behavior. +- map_toeplitz_key - file descriptor of the 'Toeplitz key' map. One element of the 40byte key prepared for the hashing algorithm. +- map_indirections_table - 128 elements of queue indexes. + +`struct EBPFRSSConfig` fields: + +- redirect - "boolean" value, should the hash be calculated, on false - `default_queue` would be used as the final decision. +- populate_hash - for now, not used. eBPF RSS doesn't support hash reporting. +- hash_types - binary mask of different hash types. See `VIRTIO_NET_RSS_HASH_TYPE_*` defines. If for packet hash should not be calculated - `default_queue` would be used. +- indirections_len - length of the indirections table, maximum 128. +- default_queue - the queue index that used for packet that shouldn't be hashed. For some packets, the hash can't be calculated(g.e ARP). + +Functions: + +- `ebpf_rss_init()` - sets ctx to NULL, which indicates that EBPFRSSContext is not loaded. +- `ebpf_rss_load()` - creates 3 maps and loads eBPF program from the rss.bpf.skeleton.h. Returns 'true' on success. After that, program_fd can be used to set steering for TAP. +- `ebpf_rss_set_all()` - sets values for eBPF maps. `indirections_table` length is in EBPFRSSConfig. `toeplitz_key` is VIRTIO_NET_RSS_MAX_KEY_SIZE aka 40 bytes array. +- `ebpf_rss_unload()` - close all file descriptors and set ctx to NULL. + +Simplified eBPF RSS workflow: + +.. code:: C + + struct EBPFRSSConfig config; + config.redirect = 1; + config.hash_types = VIRTIO_NET_RSS_HASH_TYPE_UDPv4 | VIRTIO_NET_RSS_HASH_TYPE_TCPv4; + config.indirections_len = VIRTIO_NET_RSS_MAX_TABLE_LEN; + config.default_queue = 0; + + uint16_t table[VIRTIO_NET_RSS_MAX_TABLE_LEN] = {...}; + uint8_t key[VIRTIO_NET_RSS_MAX_KEY_SIZE] = {...}; + + struct EBPFRSSContext ctx; + ebpf_rss_init(&ctx); + ebpf_rss_load(&ctx); + ebpf_rss_set_all(&ctx, &config, table, key); + if (net_client->info->set_steering_ebpf != NULL) { + net_client->info->set_steering_ebpf(net_client, ctx->program_fd); + } + ... + ebpf_unload(&ctx); + + +NetClientState SetSteeringEBPF() +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +For now, `set_steering_ebpf()` method supported by Linux TAP NetClientState. The method requires an eBPF program file descriptor as an argument. diff --git a/docs/devel/index.rst b/docs/devel/index.rst index 6cf7e2d233..33179ba309 100644 --- a/docs/devel/index.rst +++ b/docs/devel/index.rst @@ -42,3 +42,4 @@ Contents: qom block-coroutine-wrapper multi-process + ebpf_rss From patchwork Wed Apr 28 16:47:33 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Melnichenko X-Patchwork-Id: 1471327 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=daynix-com.20150623.gappssmtp.com header.i=@daynix-com.20150623.gappssmtp.com header.a=rsa-sha256 header.s=20150623 header.b=PRgBwO0W; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4FVlKK2ScRz9t1L for ; Thu, 29 Apr 2021 03:01:41 +1000 (AEST) Received: from localhost ([::1]:58300 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lbnZC-0005s0-Pg for incoming@patchwork.ozlabs.org; Wed, 28 Apr 2021 13:01:38 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34296) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lbnLv-0004CT-Aq for qemu-devel@nongnu.org; Wed, 28 Apr 2021 12:47:55 -0400 Received: from mail-lf1-x133.google.com ([2a00:1450:4864:20::133]:34496) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lbnLr-0006in-9U for qemu-devel@nongnu.org; Wed, 28 Apr 2021 12:47:55 -0400 Received: by mail-lf1-x133.google.com with SMTP id z13so19296948lft.1 for ; Wed, 28 Apr 2021 09:47:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=daynix-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=HsiF1/EhRsF2rPRBEnHP1f/R5pxso3L25zHd/RevGm4=; b=PRgBwO0WuRlzUcNODsIHd/lqqdcBDMVACPnTuaLkkNJ4tlfyrh54A+MGTMBLDwQbdU utk2BNZsM2hvt0kKskVH77DPQ2w3BtGBxbCznKxO3NIMJVadLgzlFsDfFo6vTN2f08Jh osUgFvfyGEgEC2cVHJAYCmHtqEvRVD48jj/vRmCtPqH7ggBnqJvCl+vo+IIcEyGJGGEd MuzeRBQnp6Yn+7wr1+E7R2/9MR4wLZvryx6Gd+q3FhACTTF2/uoxOquhV7B5eWOTVBDB ERT3Aim9WFMYTSrJ4dvSQXqiXIUwrM7QHU6QmLdURX69wZrgfqszRFap9lauH1Wdp584 5I9A== 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=HsiF1/EhRsF2rPRBEnHP1f/R5pxso3L25zHd/RevGm4=; b=mCPZXOdpoqNk968Bx7svoA+ZgdE9P9OFLXNujNql5v3UMqPpSn3Wil94LIV55I7lxH zU/RFADI9YhcWAiKITk+f1uJPAwcfsEZ/NC3wuANB3EVMHTv8Gqbqk3SXgGaqNWBqIGP JDR+Rxm2tKdKCF9+LsilVwIzsPhohrpy1lpwQ8U8rM65n+ziQov1Y6luR6mi4Dxzv0Rq Zo0/2mUe/SHWQkY1VU/Yzz4AAH0vXxaQJAivAeN7oVPhWORTm86K06jC6CqVY1HuoM51 l+f3bXTNRbtuQ4huRE5etdSSvXpkLvS0JUbg3EiWbwt/7mRuntbMBYuVv+I2TfO8UZ5U d1cg== X-Gm-Message-State: AOAM532EnuUuX9OunOGQbstpaoIYa7g/z0B5EQUh3FkKp5gGujPHk08s qvneoDQDUD4iRkA634bx7SNy8g== X-Google-Smtp-Source: ABdhPJzpRIeUyPQDQLxTWFIZ2vGMHOyMCVBOJSnOaeR/pWTt0ID/BM9zmQ8TsbYfh+KmpHqotKeBEg== X-Received: by 2002:ac2:4f03:: with SMTP id k3mr1190262lfr.254.1619628469838; Wed, 28 Apr 2021 09:47:49 -0700 (PDT) Received: from navi.cosmonova.net.ua ([95.67.24.131]) by smtp.gmail.com with ESMTPSA id v24sm86302lfp.195.2021.04.28.09.47.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Apr 2021 09:47:49 -0700 (PDT) From: Andrew Melnychenko To: jasowang@redhat.com, mst@redhat.com Subject: [PATCH v7 7/7] MAINTAINERS: Added eBPF maintainers information. Date: Wed, 28 Apr 2021 19:47:33 +0300 Message-Id: <20210428164733.56547-8-andrew@daynix.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210428164733.56547-1-andrew@daynix.com> References: <20210428164733.56547-1-andrew@daynix.com> MIME-Version: 1.0 Received-SPF: none client-ip=2a00:1450:4864:20::133; envelope-from=andrew@daynix.com; helo=mail-lf1-x133.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: yan@daynix.com, yuri.benditovich@daynix.com, berrange@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Yuri Benditovich Signed-off-by: Andrew Melnychenko --- MAINTAINERS | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 36055f14c5..c7e9a57cd9 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3312,6 +3312,14 @@ F: include/hw/remote/proxy-memory-listener.h F: hw/remote/iohub.c F: include/hw/remote/iohub.h +EBPF: +M: Jason Wang +R: Andrew Melnychenko +R: Yuri Benditovich +S: Maintained +F: ebpf/* +F: tools/ebpf/* + Build and test automation ------------------------- Build and test automation, general continuous integration