From patchwork Wed Feb 10 16:31:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Lobakin X-Patchwork-Id: 12081179 X-Patchwork-Delegate: kuba@kernel.org 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 69BB4C433E0 for ; Wed, 10 Feb 2021 16:34:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 35F2B64E87 for ; Wed, 10 Feb 2021 16:34:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232439AbhBJQeB (ORCPT ); Wed, 10 Feb 2021 11:34:01 -0500 Received: from mail-40134.protonmail.ch ([185.70.40.134]:17907 "EHLO mail-40134.protonmail.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232658AbhBJQcL (ORCPT ); Wed, 10 Feb 2021 11:32:11 -0500 Date: Wed, 10 Feb 2021 16:31:10 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pm.me; s=protonmail; t=1612974681; bh=o2wiiUInU+gAyFME41HQ/iCz8nud3W/AU2pVW55YAus=; h=Date:To:From:Cc:Reply-To:Subject:In-Reply-To:References:From; b=B9DsQvFOMGOV4Yd/Qwrj2OjbCRcFkCUSXxophs7z5tDqdKz0r+iJPOgT6qZqQKcv+ yWOM5BIS50Sy+HlAbRocmO3Wx9No+PB8IZE7Zg2IVI3Kd+Z8i+l0f1C3GU9ZZRk+Sq IHNasTC+vNwHzIE4OvFpGUXSxkDKMewvROqqIZh48jmmLyS1SbfPIK+b2nRWuBsRyw tqT4ZzLaQShAE3LVWdJ25YTl7GaU/IOz/Vm9b5/tM38L84Ro8ljFoLmevHzKGT1IVS X307clRi009uWvEmb+ItJocgjQU6lT7ZyHZy4fq9+YzPnAIDd0hGGsLrOnZAWp9rdM aItweEqRwreaQ== To: "David S. Miller" , Jakub Kicinski From: Alexander Lobakin Cc: Jonathan Lemon , Eric Dumazet , Dmitry Vyukov , Willem de Bruijn , Alexander Lobakin , Randy Dunlap , Kevin Hao , Pablo Neira Ayuso , Jakub Sitnicki , Marco Elver , Dexuan Cui , Paolo Abeni , Jesper Dangaard Brouer , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Taehee Yoo , Cong Wang , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , Miaohe Lin , Guillaume Nault , Yonghong Song , zhudi , Michal Kubecek , Marcelo Ricardo Leitner , Dmitry Safonov <0x7f454c46@gmail.com>, Yang Yingliang , Florian Westphal , Edward Cree , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Reply-To: Alexander Lobakin Subject: [PATCH v4 net-next 11/11] skbuff: queue NAPI_MERGED_FREE skbs into NAPI cache instead of freeing Message-ID: <20210210162732.80467-12-alobakin@pm.me> In-Reply-To: <20210210162732.80467-1-alobakin@pm.me> References: <20210210162732.80467-1-alobakin@pm.me> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org napi_frags_finish() and napi_skb_finish() can only be called inside NAPI Rx context, so we can feed NAPI cache with skbuff_heads that got NAPI_MERGED_FREE verdict instead of immediate freeing. Replace __kfree_skb() with __kfree_skb_defer() in napi_skb_finish() and move napi_skb_free_stolen_head() to skbuff.c, so it can drop skbs to NAPI cache. As many drivers call napi_alloc_skb()/napi_get_frags() on their receive path, this becomes especially useful. Signed-off-by: Alexander Lobakin --- include/linux/skbuff.h | 1 + net/core/dev.c | 9 +-------- net/core/skbuff.c | 12 +++++++++--- 3 files changed, 11 insertions(+), 11 deletions(-) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 906122eac82a..6d0a33d1c0db 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -2921,6 +2921,7 @@ static inline struct sk_buff *napi_alloc_skb(struct napi_struct *napi, } void napi_consume_skb(struct sk_buff *skb, int budget); +void napi_skb_free_stolen_head(struct sk_buff *skb); void __kfree_skb_defer(struct sk_buff *skb); /** diff --git a/net/core/dev.c b/net/core/dev.c index 7134ae2fc0db..f04877295b4f 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -6094,13 +6094,6 @@ struct packet_offload *gro_find_complete_by_type(__be16 type) } EXPORT_SYMBOL(gro_find_complete_by_type); -static void napi_skb_free_stolen_head(struct sk_buff *skb) -{ - skb_dst_drop(skb); - skb_ext_put(skb); - kmem_cache_free(skbuff_head_cache, skb); -} - static gro_result_t napi_skb_finish(struct napi_struct *napi, struct sk_buff *skb, gro_result_t ret) @@ -6114,7 +6107,7 @@ static gro_result_t napi_skb_finish(struct napi_struct *napi, if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) napi_skb_free_stolen_head(skb); else - __kfree_skb(skb); + __kfree_skb_defer(skb); break; case GRO_HELD: diff --git a/net/core/skbuff.c b/net/core/skbuff.c index ac6e0172f206..9ff701afa837 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -917,9 +917,6 @@ static void napi_skb_cache_put(struct sk_buff *skb) struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache); u32 i; - /* drop skb->head and call any destructors for packet */ - skb_release_all(skb); - kasan_poison_object_data(skbuff_head_cache, skb); nc->skb_cache[nc->skb_count++] = skb; @@ -936,6 +933,14 @@ static void napi_skb_cache_put(struct sk_buff *skb) void __kfree_skb_defer(struct sk_buff *skb) { + skb_release_all(skb); + napi_skb_cache_put(skb); +} + +void napi_skb_free_stolen_head(struct sk_buff *skb) +{ + skb_dst_drop(skb); + skb_ext_put(skb); napi_skb_cache_put(skb); } @@ -961,6 +966,7 @@ void napi_consume_skb(struct sk_buff *skb, int budget) return; } + skb_release_all(skb); napi_skb_cache_put(skb); } EXPORT_SYMBOL(napi_consume_skb);