From patchwork Wed Jul 28 16:24:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Abeni X-Patchwork-Id: 488448 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 787F1C4338F for ; Wed, 28 Jul 2021 16:24:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 61F2A60F9B for ; Wed, 28 Jul 2021 16:24:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230420AbhG1QYw (ORCPT ); Wed, 28 Jul 2021 12:24:52 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:40892 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229537AbhG1QYo (ORCPT ); Wed, 28 Jul 2021 12:24:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1627489482; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ODP3Lmh29eQiV6enDZGG45Jje9Il0RtrlXidMbt/qVI=; b=eEIzndCK8sy3s7BF8S6HWucFz2msSDp0SAX584QKsqUazDc4RqQ8A1iql3WEyWNqtZNtlv q8FSYJvP51fu78TNHgAHuWzP97ANOoFHhhFRJ3Nkmf5RQIg0azKTcOXOh7C3VbzYqlgr4V sVr0W+tzKpDYZ79q2ojEudGxZxeGM+8= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-366-hi2_Xf2UMhCvPGIWnkYzGA-1; Wed, 28 Jul 2021 12:24:40 -0400 X-MC-Unique: hi2_Xf2UMhCvPGIWnkYzGA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A018A1084F40; Wed, 28 Jul 2021 16:24:39 +0000 (UTC) Received: from gerbillo.redhat.com (ovpn-113-169.ams2.redhat.com [10.36.113.169]) by smtp.corp.redhat.com (Postfix) with ESMTP id 88D6E5C1B4; Wed, 28 Jul 2021 16:24:38 +0000 (UTC) From: Paolo Abeni To: netdev@vger.kernel.org Cc: "David S. Miller" , Jakub Kicinski , Eric Dumazet Subject: [PATCH net-next 5/6] skbuff: allow 'slow_gro' for skb carring sock reference Date: Wed, 28 Jul 2021 18:24:03 +0200 Message-Id: <4864c71049779d924c1cf9d2cd8a86b064f8fd17.1627405778.git.pabeni@redhat.com> In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This change leverages the infrastructure introduced by the previous patches to allow soft devices passing to the GRO engine owned skbs without impacting the fast-path. It's up to the GRO caller ensuring the slow_gro bit validity before invoking the GRO engine. The new helper skb_prepare_for_gro() is introduced for that goal. On slow_gro, skbs are aggregated only with equal sk. Additionally, skb truesize on GRO recycle and free is correctly updated so that sk wmem is not changed by the GRO processing. rfc-> v1: - fixed bad truesize on dev_gro_receive NAPI_FREE - use the existing state bit Signed-off-by: Paolo Abeni --- include/net/sock.h | 9 +++++++++ net/core/dev.c | 2 ++ net/core/skbuff.c | 17 +++++++++++++---- 3 files changed, 24 insertions(+), 4 deletions(-) diff --git a/include/net/sock.h b/include/net/sock.h index f23cb259b0e2..ff1be7e7e90b 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -2249,6 +2249,15 @@ static inline __must_check bool skb_set_owner_sk_safe(struct sk_buff *skb, struc return false; } +static inline void skb_prepare_for_gro(struct sk_buff *skb) +{ + if (skb->destructor != sock_wfree) { + skb_orphan(skb); + return; + } + skb->slow_gro = 1; +} + void sk_reset_timer(struct sock *sk, struct timer_list *timer, unsigned long expires); diff --git a/net/core/dev.c b/net/core/dev.c index 19565f7497ee..dcc87fcd64ba 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -6034,6 +6034,7 @@ static void gro_list_prepare(const struct list_head *head, struct tc_skb_ext *p_ext; #endif + diffs |= p->sk != skb->sk; diffs |= skb_metadata_dst_cmp(p, skb); diffs |= skb_get_nfct(p) ^ skb_get_nfct(skb); @@ -6311,6 +6312,7 @@ static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) skb_shinfo(skb)->gso_type = 0; skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); if (unlikely(skb->slow_gro)) { + skb_orphan(skb); skb_ext_reset(skb); nf_reset_ct(skb); skb->slow_gro = 0; diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 8231cbddb6ed..9510cb0807bc 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -958,6 +958,7 @@ void napi_skb_free_stolen_head(struct sk_buff *skb) nf_reset_ct(skb); skb_dst_drop(skb); skb_ext_put(skb); + skb_orphan(skb); skb->slow_gro = 0; } napi_skb_cache_put(skb); @@ -3898,6 +3899,9 @@ int skb_gro_receive_list(struct sk_buff *p, struct sk_buff *skb) NAPI_GRO_CB(p)->last = skb; NAPI_GRO_CB(p)->count++; p->data_len += skb->len; + + /* sk owenrship - if any - completely transferred to the aggregated packet */ + skb->destructor = NULL; p->truesize += skb->truesize; p->len += skb->len; @@ -4265,6 +4269,7 @@ int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb) unsigned int headlen = skb_headlen(skb); unsigned int len = skb_gro_len(skb); unsigned int delta_truesize; + unsigned int new_truesize; struct sk_buff *lp; if (unlikely(p->len + len >= 65536 || NAPI_GRO_CB(skb)->flush)) @@ -4296,10 +4301,10 @@ int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb) skb_frag_size_sub(frag, offset); /* all fragments truesize : remove (head size + sk_buff) */ - delta_truesize = skb->truesize - - SKB_TRUESIZE(skb_end_offset(skb)); + new_truesize = SKB_TRUESIZE(skb_end_offset(skb)); + delta_truesize = skb->truesize - new_truesize; - skb->truesize -= skb->data_len; + skb->truesize = new_truesize; skb->len -= skb->data_len; skb->data_len = 0; @@ -4328,12 +4333,16 @@ int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb) memcpy(frag + 1, skbinfo->frags, sizeof(*frag) * skbinfo->nr_frags); /* We dont need to clear skbinfo->nr_frags here */ - delta_truesize = skb->truesize - SKB_DATA_ALIGN(sizeof(struct sk_buff)); + new_truesize = SKB_TRUESIZE(sizeof(struct sk_buff)); + delta_truesize = skb->truesize - new_truesize; + skb->truesize = new_truesize; NAPI_GRO_CB(skb)->free = NAPI_GRO_FREE_STOLEN_HEAD; goto done; } merge: + /* sk owenrship - if any - completely transferred to the aggregated packet */ + skb->destructor = NULL; delta_truesize = skb->truesize; if (offset > headlen) { unsigned int eat = offset - headlen;