Received: by 2002:a05:7412:5112:b0:fa:6e18:a558 with SMTP id fm18csp1357932rdb; Wed, 24 Jan 2024 12:34:07 -0800 (PST) X-Google-Smtp-Source: AGHT+IGvaCfEt2nwx1VlekPt8TjtsJ75QLJjqd/ML0+7WH+42QKGeFOmTnrIDKHCHCZR9eFK1Q4Z X-Received: by 2002:a05:6a20:c126:b0:19b:46f1:6fc5 with SMTP id bh38-20020a056a20c12600b0019b46f16fc5mr6114pzb.96.1706128446731; Wed, 24 Jan 2024 12:34:06 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1706128446; cv=pass; d=google.com; s=arc-20160816; b=0sjUMDxjcyjwDelyZHVukZwZ32RHffXsq1tkzAiEw5l0+L/9IcGPrRliR0YeiZIqYA 3AMjlQ2WJ32S9F1DSgtOgappW7NA0svzTq9ov4F0YyKE2CYyfN7Z0sYtd87nW3GVvKU0 9Ct+pbQOVsl2LSZzkiKr9jnPLrNBBw2dpelnic2uKGIgtD3UPoIoLPmUbgY85izNTXRD wmDY7hFZRa6RBtovHRN+AfN39IlkfcmQbYa9BxI+9A8j0UlZxZFmT8q9ky75MPZ47Aqj FbZVvlRL+JpZs9yW8GOqu80ihHRrxqlAdoXDm4SbMw7KptDaNz9MoAWAuNfqlDLcsQHW nn9g== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:list-unsubscribe:list-subscribe:list-id:precedence :user-agent:content-transfer-encoding:autocrypt:references :in-reply-to:date:to:from:subject:message-id:dkim-signature; bh=0PBfahF5AQRpmNICWcHgB/dB2W3z68UykU6ziKFmKQ4=; fh=3+AFNg/cdxydkixGrnvhIwAsPhbFF8VeG972tsmF1+g=; b=hwnEN3G64FZIDOHbsN3nyi4x1hDKwsKsvnOaLvrRO3t7d5hEkqjfWBcJPZXPJ7or0g owWXmOXnLYlFwvwYHg9mtUT2QMWP/jqM49LycKr6iOAEPmZi3b3rM2u38Oi1lkdX8kSH 56leSFzZfByLWTjH+RM7Wb1FxArbrgtCEauq5wurM/jSnO+g3fgqGmVT63kftrAnNw4P Peh2hUCm6kzD+MILAvE/L3MK9G9S19vWSgwMq650EvW746A5u7ptDPnV67MpzlMhF3Aq N1sVMLVpSKDt8GAyc8m8EUUnP3EBGxdsaQY9IkDLKAilrsC4lZH8/laG533LEfWcdcJE tKhQ== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=lhbUaltW; arc=pass (i=1 dkim=pass dkdomain=kernel.org); spf=pass (google.com: domain of linux-nfs+bounces-1315-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) smtp.mailfrom="linux-nfs+bounces-1315-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Return-Path: Received: from sv.mirrors.kernel.org (sv.mirrors.kernel.org. [139.178.88.99]) by mx.google.com with ESMTPS id c4-20020a630d04000000b005c680fbab22si12160547pgl.509.2024.01.24.12.34.06 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Jan 2024 12:34:06 -0800 (PST) Received-SPF: pass (google.com: domain of linux-nfs+bounces-1315-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=lhbUaltW; arc=pass (i=1 dkim=pass dkdomain=kernel.org); spf=pass (google.com: domain of linux-nfs+bounces-1315-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) smtp.mailfrom="linux-nfs+bounces-1315-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sv.mirrors.kernel.org (Postfix) with ESMTPS id EFD982817FD for ; Wed, 24 Jan 2024 20:34:05 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id AA71E64CFE; Wed, 24 Jan 2024 20:34:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="lhbUaltW" X-Original-To: linux-nfs@vger.kernel.org Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 84B225B1E3 for ; Wed, 24 Jan 2024 20:34:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706128444; cv=none; b=jLwuWR4ppm7lNBc1sPkctAAdcs/b2+AtRiCEdodLK2bHa1LpIaGIu+XOpk0aGpz4yQvBXDW9kq6RBxrMXYrrDaqfra0/rfVjColyJzlEF8i2EYeNbGhfx6RCURc1vpgySb5gqq8O2+8MZiYuCAef7LSS8fq5MfqKXsdNSNAkpQ4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706128444; c=relaxed/simple; bh=xyNdisD6O/9CFkrgsioL6gNUII/Js8LWOi0JvjHdHzA=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References: Content-Type:MIME-Version; b=ku0zQcDhlypIiSJRK/MdBkOJZeOkMG704WlV00WlWSx5+peo+yeLD6D7XbMC9OoMn20h0UA27riTlpTneUz57TQH5o1DmCgfc9fD4synlOlfu+O6tQPKIFu0VqXmEb0oU+f9DaygIYHwuLHDAFo9mFNjpWri2ejpbSIl7YGE9/4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lhbUaltW; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id C18A4C433F1; Wed, 24 Jan 2024 20:34:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706128444; bh=xyNdisD6O/9CFkrgsioL6gNUII/Js8LWOi0JvjHdHzA=; h=Subject:From:To:Date:In-Reply-To:References:From; b=lhbUaltWUJ/fCih9pkdBNUsL3mfRIUpq+Chvwoh1xOPbL8Q+kpyqRDfrzlQJtK0E/ tdh+vOhQEz0hvTJ7mXsIHwqThkLxowBYtG/stywsvPfMnpDR4LbVpAmWjjuG/g1dLj HJKzCM6BxDApiShXiSwBFwACQ3JJwNr0NGwu07OdPjdryXI+TzIxus7ONHgxuKBw90 ZiBXYhjKzTbpdpQg9+LbWRakqJr7ou3gb60fwV/k4Ht/AqHLPCXpz8NvGhptzDRC/v 6A+EEIvJhvfQLDNgxTRgxfPWS6bAiRobNjLzHpMkVay8F/mx5t1fK9a7gDJjXHvlAC 20+Llsvy7NENw== Message-ID: <81fb5fddeb51b96595444be0ba36718e5ffeea54.camel@kernel.org> Subject: Re: [PATCH v1] NFSD: Add a switch to disable nfsd_splice_read() From: Jeff Layton To: Chuck Lever , linux-nfs@vger.kernel.org Date: Wed, 24 Jan 2024 15:34:02 -0500 In-Reply-To: <170602632623.217131.13021600519850917517.stgit@manet.1015granger.net> References: <170602632623.217131.13021600519850917517.stgit@manet.1015granger.net> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=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 r0kmR/arUS2st+ecRsCnwAOj6HiURwIgfDMHGPtSkoPpu3DDp/cjcYUg3HaOJuTjtGHFH963B+f+hyQ2BrQZBBE76ErgTDJ2Db9Ey0kw7VEZ4I2nnVUY9B5dE2pJFVO5HJBMp30fUGKvwaKqYCU2iAKxdmJXRIONb7dSde8LqZahuunPDMZyMA5+mkQl7kpIpR6kVDIiqmxzRuPeiMP7O2FCUlS2DnJnRVrHmCljLkZWf7ZUA22wJpepBligemtSRSbqCyZ3B48zJ8g5B8xLEntPo/NknSJaYRvfEQqGxgk5kkNWMIMDkfQOlDSXZvoxqU9wFH/9jTv1/6p8dHeGM0BsbBLMqQaqnWiVt5mG92E1zkOW69LnoozE6Le+12DsNW7RjiR5K+27MObjXEYIW7FIvNN/TQ6U1EOsdxwB8o//Yfc3p2QqPr5uS93SDDan5ehH59BnHpguTc27XiQQZ9EGiieCUx6Zh2ze3X2UW9YNzE15uKwkkuEIj60NvQRmEDfweYfOfPVOueC+iFifbQgSmVmZiBMYXl0b24gPGpsYXl0b25AcmVkaGF0LmNvbT6JAjgEEwECACIFAk6V0q0CGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEAAOaEEZVoIViKUQALpvsacTMWWOd7SlPFzIYy2/fjvKlfB/Xs4YdNcf9qLqF+lk2RBUHdR/dGwZpvw/OLmnZ8TryDo2zXVJNWEEUFNc7wQpl3i78r6UU/GUY/RQmOgPhs3epQC3PMJj4xFx+VuVcf/MXgDDdBUHaCTT793hyBeDbQuciARDJAW24Q1RCmjcwWIV/pgrlFa4lAXsmhoac8UPc82Ijrs6ivlTweFf16VBc4nSLX5FB3ls7S5noRhm5/Zsd4PGPgIHgCZcPgkAnU1S/A/rSqf3FLpU+CbVBDvlVAnOq9gfNF+QiTlOHdZVIe4gEYAU3CUjbleywQqV02BKxPVM0C5/oVjMVx 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 BOTtmOdz4ZN2tdvNgozzuxp4CHBDVzAslUi2idy+xpsp47DWPxYFIRP3M8QG/aNW052LaPc0cedYxp8+9eiVUNpxF4SiU4i9JDfX/sn9XcfoVZIxMpCRE750zvJvcCUz9HojsrMQ1NFc7MFT1z3MOW2/RlzPcog7xvR5ENPH19ojRDCHqumUHRry+RF0lH00clzX/W8OrQJZtoBPXv9ahka/Vp7kEulcBJr1cH5Wz/WprhsIM7U9pse1f1gYy9YbXtWctUz8uvDR7shsQxAhX3qO7DilMtuGo1v97I/Kx4gXQ52syh/w6EBny71CZrOgD6kJwPVVAaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJOaEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhpf8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+mQZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65ke5Ag0ETpXRPAEQAJkVmzCmF+IEenf9a2nZRXMluJohnfl2wCMmw5qNzyk0f+mYuTwTCpw7BE2H0yXk4ZfAuA+xdj14K0A1Dj52j/fKRuDqoNAhQe0b6ipo85Sz98G+XnmQOMeFVp5G1Z7r/QP/nus3mXvtFsu9lLSjMA0cam2NLDt7vx3l9kUYlQBhyIE7/DkKg+3fdqRg7qJoMHNcODtQY+n3hMyaVpplJ/l0DdQDbRSZi5AzDM3DWZEShhuP6/E2LN4O3xWnZukEiz688d1ppl7vBZO9wBql6Ft9Og74diZrTN6lXGGjEWRvO55h6ijMsLCLNDRAVehPhZvSlPldtUuvhZLAjdWpwmzbRIwgoQcO51aWeKthpcpj8feDdKdlVjvJO9fgFD5kqZ 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 (3.50.3-1.fc39) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2024-01-23 at 11:12 -0500, Chuck Lever wrote: > From: Chuck Lever >=20 > This enables us to ensure that testing properly covers the readv > paths as well as the spliced read paths, which are more commonly > used. Also this makes it easier to do benchmark comparisons between > splice and vectored reads. >=20 > Suggested-by: Jeff Layton > Signed-off-by: Chuck Lever > --- > Documentation/netlink/specs/nfsd.yaml | 19 +++++++ > fs/nfsd/netlink.c | 17 ++++++ > fs/nfsd/netlink.h | 3 + > fs/nfsd/netns.h | 1=20 > fs/nfsd/nfsctl.c | 45 ++++++++++++++++ > include/uapi/linux/nfsd_netlink.h | 8 +++ > tools/net/ynl/generated/nfsd-user.c | 95 +++++++++++++++++++++++++++= ++++++ > tools/net/ynl/generated/nfsd-user.h | 47 ++++++++++++++++ > 8 files changed, 235 insertions(+) >=20 I think this makes sense. How are you testing it, and how do you forsee us using this interface? Will we need a new program in nfs-utils or will you extend an existing one? > diff --git a/Documentation/netlink/specs/nfsd.yaml b/Documentation/netlin= k/specs/nfsd.yaml > index 05acc73e2e33..1a3c5e78b388 100644 > --- a/Documentation/netlink/specs/nfsd.yaml > +++ b/Documentation/netlink/specs/nfsd.yaml > @@ -62,6 +62,12 @@ attribute-sets: > name: compound-ops > type: u32 > multi-attr: true > + - > + name: splice-read > + attributes: > + - > + name: enabled > + type: u32 > =20 > operations: > list: > @@ -87,3 +93,16 @@ operations: > - sport > - dport > - compound-ops > + - > + name: splice-read > + doc: Disable the use of splice for NFS READ operations > + attribute-set: splice-read > + flags: [ admin-perm ] > + do: > + request: > + attributes: > + - enabled > + dump: > + reply: > + attributes: > + - enabled > diff --git a/fs/nfsd/netlink.c b/fs/nfsd/netlink.c > index 0e1d635ec5f9..c47f3527d30b 100644 > --- a/fs/nfsd/netlink.c > +++ b/fs/nfsd/netlink.c > @@ -10,6 +10,11 @@ > =20 > #include > =20 > +/* NFSD_CMD_SPLICE_READ - do */ > +static const struct nla_policy nfsd_splice_read_nl_policy[NFSD_A_SPLICE_= READ_ENABLED + 1] =3D { > + [NFSD_A_SPLICE_READ_ENABLED] =3D { .type =3D NLA_U32, }, > +}; > + > /* Ops table for nfsd */ > static const struct genl_split_ops nfsd_nl_ops[] =3D { > { > @@ -19,6 +24,18 @@ static const struct genl_split_ops nfsd_nl_ops[] =3D { > .done =3D nfsd_nl_rpc_status_get_done, > .flags =3D GENL_CMD_CAP_DUMP, > }, > + { > + .cmd =3D NFSD_CMD_SPLICE_READ, > + .doit =3D nfsd_nl_splice_read_doit, > + .policy =3D nfsd_splice_read_nl_policy, > + .maxattr =3D NFSD_A_SPLICE_READ_ENABLED, > + .flags =3D GENL_ADMIN_PERM | GENL_CMD_CAP_DO, > + }, > + { > + .cmd =3D NFSD_CMD_SPLICE_READ, > + .dumpit =3D nfsd_nl_splice_read_dumpit, > + .flags =3D GENL_ADMIN_PERM | GENL_CMD_CAP_DUMP, > + }, > }; > =20 > struct genl_family nfsd_nl_family __ro_after_init =3D { > diff --git a/fs/nfsd/netlink.h b/fs/nfsd/netlink.h > index d83dd6bdee92..2d96d0f093bb 100644 > --- a/fs/nfsd/netlink.h > +++ b/fs/nfsd/netlink.h > @@ -16,6 +16,9 @@ int nfsd_nl_rpc_status_get_done(struct netlink_callback= *cb); > =20 > int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb, > struct netlink_callback *cb); > +int nfsd_nl_splice_read_doit(struct sk_buff *skb, struct genl_info *info= ); > +int nfsd_nl_splice_read_dumpit(struct sk_buff *skb, > + struct netlink_callback *cb); > =20 > extern struct genl_family nfsd_nl_family; > =20 > diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h > index 74b4360779a1..3b9e09fecbfc 100644 > --- a/fs/nfsd/netns.h > +++ b/fs/nfsd/netns.h > @@ -109,6 +109,7 @@ struct nfsd_net { > =20 > bool nfsd_net_up; > bool lockd_up; > + bool spliced_reads; > =20 > seqlock_t writeverf_lock; > unsigned char writeverf[8]; > diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c > index 8e6dbe9e0b65..86f466dbc784 100644 > --- a/fs/nfsd/nfsctl.c > +++ b/fs/nfsd/nfsctl.c > @@ -1696,6 +1696,51 @@ int nfsd_nl_rpc_status_get_done(struct netlink_cal= lback *cb) > return 0; > } > =20 > +/** > + * nfsd_nl_splice_read_doit - Set the value of splice_read > + * @skb: call buffer > + * @info: netlink metadata and command arguments > + * > + * Returns zero on success, or a negative errno. > + */ > +int nfsd_nl_splice_read_doit(struct sk_buff *skb, struct genl_info *info= ) > +{ > + struct nfsd_net *nn =3D net_generic(sock_net(skb->sk), nfsd_net_id); > + u32 newval; > + > + if (GENL_REQ_ATTR_CHECK(info, NFSD_A_SPLICE_READ_ENABLED)) > + return -EINVAL; > + > + newval =3D nla_get_u32(info->attrs[NFSD_A_SPLICE_READ_ENABLED]); > + nn->spliced_reads =3D newval ? true : false; > + return 0; > +} > + > +/** > + * nfsd_nl_splice_read_dumpit - Return the value of splice_read > + * @skb: reply buffer > + * @cb: netlink metadata and command arguments > + * > + * Returns the size of the reply or a negative errno. > + */ > +int nfsd_nl_splice_read_dumpit(struct sk_buff *skb, struct netlink_callb= ack *cb) > +{ > + struct nfsd_net *nn =3D net_generic(sock_net(skb->sk), nfsd_net_id); > + void *hdr; > + > + hdr =3D genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq= , > + &nfsd_nl_family, 0, NFSD_CMD_SPLICE_READ); > + if (!hdr) > + return -ENOBUFS; > + > + if (nla_put_s32(skb, NFSD_A_SPLICE_READ_ENABLED, > + (nn->spliced_reads ? 1 : 0))) > + return -ENOBUFS; > + > + genlmsg_end(skb, hdr); > + return 0; > +} > + > /** > * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace > * @net: a freshly-created network namespace > diff --git a/include/uapi/linux/nfsd_netlink.h b/include/uapi/linux/nfsd_= netlink.h > index 3cd044edee5d..c2542ed18b50 100644 > --- a/include/uapi/linux/nfsd_netlink.h > +++ b/include/uapi/linux/nfsd_netlink.h > @@ -29,8 +29,16 @@ enum { > NFSD_A_RPC_STATUS_MAX =3D (__NFSD_A_RPC_STATUS_MAX - 1) > }; > =20 > +enum { > + NFSD_A_SPLICE_READ_ENABLED =3D 1, > + > + __NFSD_A_SPLICE_READ_MAX, > + NFSD_A_SPLICE_READ_MAX =3D (__NFSD_A_SPLICE_READ_MAX - 1) > +}; > + > enum { > NFSD_CMD_RPC_STATUS_GET =3D 1, > + NFSD_CMD_SPLICE_READ, > =20 > __NFSD_CMD_MAX, > NFSD_CMD_MAX =3D (__NFSD_CMD_MAX - 1) > diff --git a/tools/net/ynl/generated/nfsd-user.c b/tools/net/ynl/generate= d/nfsd-user.c > index 360b6448c6e9..14957bdfbe9c 100644 > --- a/tools/net/ynl/generated/nfsd-user.c > +++ b/tools/net/ynl/generated/nfsd-user.c > @@ -15,6 +15,7 @@ > /* Enums */ > static const char * const nfsd_op_strmap[] =3D { > [NFSD_CMD_RPC_STATUS_GET] =3D "rpc-status-get", > + [NFSD_CMD_SPLICE_READ] =3D "splice-read", > }; > =20 > const char *nfsd_op_str(int op) > @@ -47,6 +48,15 @@ struct ynl_policy_nest nfsd_rpc_status_nest =3D { > .table =3D nfsd_rpc_status_policy, > }; > =20 > +struct ynl_policy_attr nfsd_splice_read_policy[NFSD_A_SPLICE_READ_MAX + = 1] =3D { > + [NFSD_A_SPLICE_READ_ENABLED] =3D { .name =3D "enabled", .type =3D YNL_P= T_U32, }, > +}; > + > +struct ynl_policy_nest nfsd_splice_read_nest =3D { > + .max_attr =3D NFSD_A_SPLICE_READ_MAX, > + .table =3D nfsd_splice_read_policy, > +}; > + > /* Common nested types */ > /* =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D NFSD_CMD_RPC_STATUS_GET = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D */ > /* NFSD_CMD_RPC_STATUS_GET - dump */ > @@ -198,6 +208,91 @@ nfsd_rpc_status_get_dump(struct ynl_sock *ys) > return NULL; > } > =20 > +/* =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D NFSD_CMD_SPLICE_READ =3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D */ > +/* NFSD_CMD_SPLICE_READ - do */ > +void nfsd_splice_read_req_free(struct nfsd_splice_read_req *req) > +{ > + free(req); > +} > + > +int nfsd_splice_read(struct ynl_sock *ys, struct nfsd_splice_read_req *r= eq) > +{ > + struct nlmsghdr *nlh; > + int err; > + > + nlh =3D ynl_gemsg_start_req(ys, ys->family_id, NFSD_CMD_SPLICE_READ, 1)= ; > + ys->req_policy =3D &nfsd_splice_read_nest; > + > + if (req->_present.enabled) > + mnl_attr_put_u32(nlh, NFSD_A_SPLICE_READ_ENABLED, req->enabled); > + > + err =3D ynl_exec(ys, nlh, NULL); > + if (err < 0) > + return -1; > + > + return 0; > +} > + > +/* NFSD_CMD_SPLICE_READ - dump */ > +int nfsd_splice_read_rsp_dump_parse(const struct nlmsghdr *nlh, void *da= ta) > +{ > + struct nfsd_splice_read_rsp_dump *dst; > + struct ynl_parse_arg *yarg =3D data; > + const struct nlattr *attr; > + > + dst =3D yarg->data; > + > + mnl_attr_for_each(attr, nlh, sizeof(struct genlmsghdr)) { > + unsigned int type =3D mnl_attr_get_type(attr); > + > + if (type =3D=3D NFSD_A_SPLICE_READ_ENABLED) { > + if (ynl_attr_validate(yarg, attr)) > + return MNL_CB_ERROR; > + dst->_present.enabled =3D 1; > + dst->enabled =3D mnl_attr_get_u32(attr); > + } > + } > + > + return MNL_CB_OK; > +} > + > +void nfsd_splice_read_rsp_list_free(struct nfsd_splice_read_rsp_list *rs= p) > +{ > + struct nfsd_splice_read_rsp_list *next =3D rsp; > + > + while ((void *)next !=3D YNL_LIST_END) { > + rsp =3D next; > + next =3D rsp->next; > + > + free(rsp); > + } > +} > + > +struct nfsd_splice_read_rsp_list *nfsd_splice_read_dump(struct ynl_sock = *ys) > +{ > + struct ynl_dump_state yds =3D {}; > + struct nlmsghdr *nlh; > + int err; > + > + yds.ys =3D ys; > + yds.alloc_sz =3D sizeof(struct nfsd_splice_read_rsp_list); > + yds.cb =3D nfsd_splice_read_rsp_dump_parse; > + yds.rsp_cmd =3D NFSD_CMD_SPLICE_READ; > + yds.rsp_policy =3D &nfsd_splice_read_nest; > + > + nlh =3D ynl_gemsg_start_dump(ys, ys->family_id, NFSD_CMD_SPLICE_READ, 1= ); > + > + err =3D ynl_exec_dump(ys, nlh, &yds); > + if (err < 0) > + goto free_list; > + > + return yds.first; > + > +free_list: > + nfsd_splice_read_rsp_list_free(yds.first); > + return NULL; > +} > + > const struct ynl_family ynl_nfsd_family =3D { > .name =3D "nfsd", > }; > diff --git a/tools/net/ynl/generated/nfsd-user.h b/tools/net/ynl/generate= d/nfsd-user.h > index 989c6e209ced..5732c5a665e7 100644 > --- a/tools/net/ynl/generated/nfsd-user.h > +++ b/tools/net/ynl/generated/nfsd-user.h > @@ -64,4 +64,51 @@ nfsd_rpc_status_get_rsp_list_free(struct nfsd_rpc_stat= us_get_rsp_list *rsp); > struct nfsd_rpc_status_get_rsp_list * > nfsd_rpc_status_get_dump(struct ynl_sock *ys); > =20 > +/* =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D NFSD_CMD_SPLICE_READ =3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D */ > +/* NFSD_CMD_SPLICE_READ - do */ > +struct nfsd_splice_read_req { > + struct { > + __u32 enabled:1; > + } _present; > + > + __u32 enabled; > +}; > + > +static inline struct nfsd_splice_read_req *nfsd_splice_read_req_alloc(vo= id) > +{ > + return calloc(1, sizeof(struct nfsd_splice_read_req)); > +} > +void nfsd_splice_read_req_free(struct nfsd_splice_read_req *req); > + > +static inline void > +nfsd_splice_read_req_set_enabled(struct nfsd_splice_read_req *req, > + __u32 enabled) > +{ > + req->_present.enabled =3D 1; > + req->enabled =3D enabled; > +} > + > +/* > + * Disable the use of splice for NFS READ operations > + */ > +int nfsd_splice_read(struct ynl_sock *ys, struct nfsd_splice_read_req *r= eq); > + > +/* NFSD_CMD_SPLICE_READ - dump */ > +struct nfsd_splice_read_rsp_dump { > + struct { > + __u32 enabled:1; > + } _present; > + > + __u32 enabled; > +}; > + > +struct nfsd_splice_read_rsp_list { > + struct nfsd_splice_read_rsp_list *next; > + struct nfsd_splice_read_rsp_dump obj __attribute__ ((aligned (8))); > +}; > + > +void nfsd_splice_read_rsp_list_free(struct nfsd_splice_read_rsp_list *rs= p); > + > +struct nfsd_splice_read_rsp_list *nfsd_splice_read_dump(struct ynl_sock = *ys); > + > #endif /* _LINUX_NFSD_GEN_H */ >=20 >=20 >=20 --=20 Jeff Layton