From patchwork Fri Apr 9 22:37:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Croce X-Patchwork-Id: 12195161 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 3A928C433ED for ; Fri, 9 Apr 2021 22:38:25 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B1622610F9 for ; Fri, 9 Apr 2021 22:38:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B1622610F9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 4C9A46B0071; Fri, 9 Apr 2021 18:38:24 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 453F46B0072; Fri, 9 Apr 2021 18:38:24 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2A8486B0073; Fri, 9 Apr 2021 18:38:24 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0092.hostedemail.com [216.40.44.92]) by kanga.kvack.org (Postfix) with ESMTP id 0791C6B0071 for ; Fri, 9 Apr 2021 18:38:24 -0400 (EDT) Received: from smtpin21.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id B233B8248047 for ; Fri, 9 Apr 2021 22:38:23 +0000 (UTC) X-FDA: 78014293686.21.1F0773E Received: from mail-ed1-f44.google.com (mail-ed1-f44.google.com [209.85.208.44]) by imf29.hostedemail.com (Postfix) with ESMTP id B6C4E130 for ; Fri, 9 Apr 2021 22:38:21 +0000 (UTC) Received: by mail-ed1-f44.google.com with SMTP id 18so8288458edx.3 for ; Fri, 09 Apr 2021 15:38:23 -0700 (PDT) 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=NBKBwFnLR6KheF+0+jTnrdx81GBF+PEZpOcMgLUdP0I=; b=W1SpzBr5VGt1yI8OVet7JNwyQm2q9X2pWCDcvFSfcZ07HPhQceF6KzZ5mbDJIJZ1aV Txv16UHGcpfmPGSDf7rJzoGYWnFWV92x76mLDFW2rzULiftzt1+5ZG/560Rz+DLaMqZ9 NEnxZYqxRo3oPLaOsUahu4t5FC25hFQEJZgbrzYvNOmzoi4+45JI/esqRESX8hKYMW8Z lzWlrxD1HHsm/ptbAyKheL9ocJLYTiksY+d+K6X3OfQDPakCFiXHAtYa6VwCpi9j8ifs VCboDp74nEko2Ufm5eBjS6L7JigVEO9ofZSZVnYUmC6Gvi5kLKba6vgg6U+4FPfrCgTu RIcw== X-Gm-Message-State: AOAM530NSiVkDntZbqzEGEMoNgeM9veTe4s5fNIp5LZQ9moKcTuEvOEC r3kOlhUZVN3sxWBM0VCs6To= X-Google-Smtp-Source: ABdhPJwtnHH8zpJEzm27S9Tc0XAdPpGrPGHLvRaejF34zvtOUNDL6mxmVFoz2jOa3QSgVZRWgp5IlQ== X-Received: by 2002:a05:6402:51cd:: with SMTP id r13mr19553933edd.116.1618007902253; Fri, 09 Apr 2021 15:38:22 -0700 (PDT) Received: from msft-t490s.teknoraver.net (net-93-66-21-119.cust.vodafonedsl.it. [93.66.21.119]) by smtp.gmail.com with ESMTPSA id s20sm2108726edu.93.2021.04.09.15.38.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Apr 2021 15:38:21 -0700 (PDT) From: Matteo Croce To: netdev@vger.kernel.org, linux-mm@kvack.org Cc: Ayush Sawal , Vinay Kumar Yadav , Rohit Maheshwari , "David S. Miller" , Jakub Kicinski , Thomas Petazzoni , Marcin Wojtas , Russell King , Mirko Lindner , Stephen Hemminger , Tariq Toukan , Jesper Dangaard Brouer , Ilias Apalodimas , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Boris Pismenny , Arnd Bergmann , Andrew Morton , "Peter Zijlstra (Intel)" , Vlastimil Babka , Yu Zhao , Will Deacon , Michel Lespinasse , Fenghua Yu , Roman Gushchin , Hugh Dickins , Peter Xu , Jason Gunthorpe , Guoqing Jiang , Jonathan Lemon , Alexander Lobakin , Cong Wang , wenxu , Kevin Hao , Aleksandr Nogikh , Jakub Sitnicki , Marco Elver , Willem de Bruijn , Miaohe Lin , Yunsheng Lin , Guillaume Nault , linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, bpf@vger.kernel.org, Matthew Wilcox , Eric Dumazet , David Ahern , Lorenzo Bianconi , Saeed Mahameed , Andrew Lunn , Paolo Abeni Subject: [PATCH net-next v3 1/5] xdp: reduce size of struct xdp_mem_info Date: Sat, 10 Apr 2021 00:37:57 +0200 Message-Id: <20210409223801.104657-2-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210409223801.104657-1-mcroce@linux.microsoft.com> References: <20210409223801.104657-1-mcroce@linux.microsoft.com> MIME-Version: 1.0 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: B6C4E130 X-Stat-Signature: yyo1psinj6ybgqweidd339fiayt1b57n Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf29; identity=mailfrom; envelope-from=""; helo=mail-ed1-f44.google.com; client-ip=209.85.208.44 X-HE-DKIM-Result: none/none X-HE-Tag: 1618007901-979644 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Jesper Dangaard Brouer It is possible to compress/reduce the size of struct xdp_mem_info. This change reduce struct xdp_mem_info from 8 bytes to 4 bytes. The member xdp_mem_info.id can be reduced to u16, as the mem_id_ht rhashtable in net/core/xdp.c is already limited by MEM_ID_MAX=0xFFFE which can safely fit in u16. The member xdp_mem_info.type could be reduced more than u16, as it stores the enum xdp_mem_type, but due to alignment it is only reduced to u16. Signed-off-by: Jesper Dangaard Brouer --- include/net/xdp.h | 4 ++-- net/core/xdp.c | 8 ++++---- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/include/net/xdp.h b/include/net/xdp.h index a5bc214a49d9..c35864d59113 100644 --- a/include/net/xdp.h +++ b/include/net/xdp.h @@ -48,8 +48,8 @@ enum xdp_mem_type { #define XDP_XMIT_FLAGS_MASK XDP_XMIT_FLUSH struct xdp_mem_info { - u32 type; /* enum xdp_mem_type, but known size type */ - u32 id; + u16 type; /* enum xdp_mem_type, but known size type */ + u16 id; }; struct page_pool; diff --git a/net/core/xdp.c b/net/core/xdp.c index 05354976c1fc..3dd47ed83778 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -35,11 +35,11 @@ static struct rhashtable *mem_id_ht; static u32 xdp_mem_id_hashfn(const void *data, u32 len, u32 seed) { - const u32 *k = data; - const u32 key = *k; + const u16 *k = data; + const u16 key = *k; BUILD_BUG_ON(sizeof_field(struct xdp_mem_allocator, mem.id) - != sizeof(u32)); + != sizeof(u16)); /* Use cyclic increasing ID as direct hash key */ return key; @@ -49,7 +49,7 @@ static int xdp_mem_id_cmp(struct rhashtable_compare_arg *arg, const void *ptr) { const struct xdp_mem_allocator *xa = ptr; - u32 mem_id = *(u32 *)arg->key; + u16 mem_id = *(u16 *)arg->key; return xa->mem.id != mem_id; } From patchwork Fri Apr 9 22:37:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Croce X-Patchwork-Id: 12195163 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 85177C433ED for ; Fri, 9 Apr 2021 22:38:50 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0D9AB61181 for ; Fri, 9 Apr 2021 22:38:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0D9AB61181 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 73A966B0072; Fri, 9 Apr 2021 18:38:49 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6EA636B0073; Fri, 9 Apr 2021 18:38:49 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5164C6B0078; Fri, 9 Apr 2021 18:38:49 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0211.hostedemail.com [216.40.44.211]) by kanga.kvack.org (Postfix) with ESMTP id 2A86A6B0072 for ; Fri, 9 Apr 2021 18:38:49 -0400 (EDT) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id E217EB7B8 for ; Fri, 9 Apr 2021 22:38:48 +0000 (UTC) X-FDA: 78014294736.18.9D77E1C Received: from mail-ej1-f52.google.com (mail-ej1-f52.google.com [209.85.218.52]) by imf08.hostedemail.com (Postfix) with ESMTP id 457B480192C0 for ; Fri, 9 Apr 2021 22:38:39 +0000 (UTC) Received: by mail-ej1-f52.google.com with SMTP id n2so10981468ejy.7 for ; Fri, 09 Apr 2021 15:38:48 -0700 (PDT) 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=WnPKFMtfhSLVnqHsKOr4n3p6UHXAjM0KTUn3EX9S5lk=; b=fQ9SJRK0r7uTTOFF4oSTZ9RCkuKJcdyfG8RKvUZbKYeCPR95t7p+sGYqrIXWPJZTDu xkfr6kLWVfmjNI4XT6lFpBPAK8sx/q2lfPghKrRaLsEpKZ+g8DdWwoI0kVrYra7MkOTF nYSzRBEBKf8f3aoBD1i+j5CWJAJVagPVw32SAnBSuP3ZivFisHUi1ZwLzcei6LpAJsJL e77j0JJpUSse1LytjUygZ0EgUX+0sm6002m9OdjLK8ziPrYHpGvg+9DKG1MhBKxAWxnJ /O9lmo4X2GXKV66vEvH/9F6QnYxGct7mkUwAt5PHL6mVoMGS8qhI8BoCdAimZzmdxfg8 SpZw== X-Gm-Message-State: AOAM5339dj6+J4i0kEM+Dhqt8fE+Q3I3ifPyOHD5eflSMC5ocjifxQzZ y9LJch3Yx93tKUW5CKb1Uxv+zP0ROK4vTg== X-Google-Smtp-Source: ABdhPJwZUB++JXfyXp3fEVkjnhLtKdZvPEwn6hIKwd5D3ixTXi4hn4Q80nn/2cJloLRuQHZ3JRaqZQ== X-Received: by 2002:a17:907:75cc:: with SMTP id jl12mr8220890ejc.52.1618007927405; Fri, 09 Apr 2021 15:38:47 -0700 (PDT) Received: from msft-t490s.teknoraver.net (net-93-66-21-119.cust.vodafonedsl.it. [93.66.21.119]) by smtp.gmail.com with ESMTPSA id s20sm2108726edu.93.2021.04.09.15.38.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Apr 2021 15:38:46 -0700 (PDT) From: Matteo Croce To: netdev@vger.kernel.org, linux-mm@kvack.org Cc: Ayush Sawal , Vinay Kumar Yadav , Rohit Maheshwari , "David S. Miller" , Jakub Kicinski , Thomas Petazzoni , Marcin Wojtas , Russell King , Mirko Lindner , Stephen Hemminger , Tariq Toukan , Jesper Dangaard Brouer , Ilias Apalodimas , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Boris Pismenny , Arnd Bergmann , Andrew Morton , "Peter Zijlstra (Intel)" , Vlastimil Babka , Yu Zhao , Will Deacon , Michel Lespinasse , Fenghua Yu , Roman Gushchin , Hugh Dickins , Peter Xu , Jason Gunthorpe , Guoqing Jiang , Jonathan Lemon , Alexander Lobakin , Cong Wang , wenxu , Kevin Hao , Aleksandr Nogikh , Jakub Sitnicki , Marco Elver , Willem de Bruijn , Miaohe Lin , Yunsheng Lin , Guillaume Nault , linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, bpf@vger.kernel.org, Matthew Wilcox , Eric Dumazet , David Ahern , Lorenzo Bianconi , Saeed Mahameed , Andrew Lunn , Paolo Abeni Subject: [PATCH net-next v3 3/5] page_pool: Allow drivers to hint on SKB recycling Date: Sat, 10 Apr 2021 00:37:59 +0200 Message-Id: <20210409223801.104657-4-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210409223801.104657-1-mcroce@linux.microsoft.com> References: <20210409223801.104657-1-mcroce@linux.microsoft.com> MIME-Version: 1.0 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 457B480192C0 X-Stat-Signature: ztnoqj34gjdjiem75saehf7t4wzeb9ou Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf08; identity=mailfrom; envelope-from=""; helo=mail-ej1-f52.google.com; client-ip=209.85.218.52 X-HE-DKIM-Result: none/none X-HE-Tag: 1618007919-748806 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Ilias Apalodimas Up to now several high speed NICs have custom mechanisms of recycling the allocated memory they use for their payloads. Our page_pool API already has recycling capabilities that are always used when we are running in 'XDP mode'. So let's tweak the API and the kernel network stack slightly and allow the recycling to happen even during the standard operation. The API doesn't take into account 'split page' policies used by those drivers currently, but can be extended once we have users for that. The idea is to be able to intercept the packet on skb_release_data(). If it's a buffer coming from our page_pool API recycle it back to the pool for further usage or just release the packet entirely. To achieve that we introduce a bit in struct sk_buff (pp_recycle:1) and store the xdp_mem_info in page->private. Storing the information in page->private allows us to recycle both SKBs and their fragments. The SKB bit is needed for a couple of reasons. First of all in an effort to affect the free path as less as possible, reading a single bit, is better that trying to derive identical information for the page stored data. Moreover page->private is used by skb_copy_ubufs. We do have a special mark in the page, that won't allow this to happen, but again deciding without having to read the entire page is preferable. The driver has to take care of the sync operations on it's own during the buffer recycling since the buffer is, after opting-in to the recycling, never unmapped. Since the gain on the drivers depends on the architecture, we are not enabling recycling by default if the page_pool API is used on a driver. In order to enable recycling the driver must call skb_mark_for_recycle() to store the information we need for recycling in page->private and enabling the recycling bit, or page_pool_store_mem_info() for a fragment Since we added an extra argument on __skb_frag_unref() to handle recycling, update the current users of the function with that. Co-developed-by: Jesper Dangaard Brouer Co-developed-by: Matteo Croce Signed-off-by: Jesper Dangaard Brouer Signed-off-by: Matteo Croce Signed-off-by: Ilias Apalodimas --- .../chelsio/inline_crypto/ch_ktls/chcr_ktls.c | 2 +- drivers/net/ethernet/marvell/sky2.c | 2 +- drivers/net/ethernet/mellanox/mlx4/en_rx.c | 2 +- include/linux/skbuff.h | 35 ++++++++++++--- include/net/page_pool.h | 13 ++++++ include/net/xdp.h | 1 + net/core/page_pool.c | 43 +++++++++++++++++++ net/core/skbuff.c | 20 ++++++++- net/core/xdp.c | 6 +++ net/tls/tls_device.c | 2 +- 10 files changed, 115 insertions(+), 11 deletions(-) diff --git a/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c b/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c index 1115b8f9ea4e..8f815ebb59ae 100644 --- a/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c +++ b/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c @@ -2125,7 +2125,7 @@ static int chcr_ktls_xmit(struct sk_buff *skb, struct net_device *dev) /* clear the frag ref count which increased locally before */ for (i = 0; i < record->num_frags; i++) { /* clear the frag ref count */ - __skb_frag_unref(&record->frags[i]); + __skb_frag_unref(&record->frags[i], false); } /* if any failure, come out from the loop. */ if (ret) { diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c index 68c154d715d6..9dc25c4fb359 100644 --- a/drivers/net/ethernet/marvell/sky2.c +++ b/drivers/net/ethernet/marvell/sky2.c @@ -2503,7 +2503,7 @@ static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space, if (length == 0) { /* don't need this page */ - __skb_frag_unref(frag); + __skb_frag_unref(frag, false); --skb_shinfo(skb)->nr_frags; } else { size = min(length, (unsigned) PAGE_SIZE); diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c index e35e4d7ef4d1..cea62b8f554c 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c @@ -526,7 +526,7 @@ static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv, fail: while (nr > 0) { nr--; - __skb_frag_unref(skb_shinfo(skb)->frags + nr); + __skb_frag_unref(skb_shinfo(skb)->frags + nr, false); } return 0; } diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index dbf820a50a39..869f248204b9 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -40,6 +40,9 @@ #if IS_ENABLED(CONFIG_NF_CONNTRACK) #include #endif +#if IS_BUILTIN(CONFIG_PAGE_POOL) +#include +#endif /* The interface for checksum offload between the stack and networking drivers * is as follows... @@ -247,6 +250,7 @@ struct napi_struct; struct bpf_prog; union bpf_attr; struct skb_ext; +struct xdp_mem_info; #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) struct nf_bridge_info { @@ -667,6 +671,8 @@ typedef unsigned char *sk_buff_data_t; * @head_frag: skb was allocated from page fragments, * not allocated by kmalloc() or vmalloc(). * @pfmemalloc: skbuff was allocated from PFMEMALLOC reserves + * @pp_recycle: mark the packet for recycling instead of freeing (implies + * page_pool support on driver) * @active_extensions: active extensions (skb_ext_id types) * @ndisc_nodetype: router type (from link layer) * @ooo_okay: allow the mapping of a socket to a queue to be changed @@ -791,10 +797,12 @@ struct sk_buff { fclone:2, peeked:1, head_frag:1, - pfmemalloc:1; + pfmemalloc:1, + pp_recycle:1; /* page_pool recycle indicator */ #ifdef CONFIG_SKB_EXTENSIONS __u8 active_extensions; #endif + /* fields enclosed in headers_start/headers_end are copied * using a single memcpy() in __copy_skb_header() */ @@ -3081,12 +3089,20 @@ static inline void skb_frag_ref(struct sk_buff *skb, int f) /** * __skb_frag_unref - release a reference on a paged fragment. * @frag: the paged fragment + * @recycle: recycle the page if allocated via page_pool * - * Releases a reference on the paged fragment @frag. + * Releases a reference on the paged fragment @frag + * or recycles the page via the page_pool API. */ -static inline void __skb_frag_unref(skb_frag_t *frag) +static inline void __skb_frag_unref(skb_frag_t *frag, bool recycle) { - put_page(skb_frag_page(frag)); + struct page *page = skb_frag_page(frag); + +#if IS_BUILTIN(CONFIG_PAGE_POOL) + if (recycle && page_pool_return_skb_page(page_address(page))) + return; +#endif + put_page(page); } /** @@ -3098,7 +3114,7 @@ static inline void __skb_frag_unref(skb_frag_t *frag) */ static inline void skb_frag_unref(struct sk_buff *skb, int f) { - __skb_frag_unref(&skb_shinfo(skb)->frags[f]); + __skb_frag_unref(&skb_shinfo(skb)->frags[f], skb->pp_recycle); } /** @@ -4697,5 +4713,14 @@ static inline u64 skb_get_kcov_handle(struct sk_buff *skb) #endif } +#if IS_BUILTIN(CONFIG_PAGE_POOL) +static inline void skb_mark_for_recycle(struct sk_buff *skb, struct page *page, + struct xdp_mem_info *mem) +{ + skb->pp_recycle = 1; + page_pool_store_mem_info(page, mem); +} +#endif + #endif /* __KERNEL__ */ #endif /* _LINUX_SKBUFF_H */ diff --git a/include/net/page_pool.h b/include/net/page_pool.h index b30405e84b5e..75fffc15788b 100644 --- a/include/net/page_pool.h +++ b/include/net/page_pool.h @@ -65,6 +65,8 @@ #define PP_ALLOC_CACHE_REFILL 64 #define PP_SIGNATURE 0x20210303 +struct xdp_mem_info; + struct pp_alloc_cache { u32 count; void *cache[PP_ALLOC_CACHE_SIZE]; @@ -148,6 +150,8 @@ inline enum dma_data_direction page_pool_get_dma_dir(struct page_pool *pool) return pool->p.dma_dir; } +bool page_pool_return_skb_page(void *data); + struct page_pool *page_pool_create(const struct page_pool_params *params); #ifdef CONFIG_PAGE_POOL @@ -243,4 +247,13 @@ static inline void page_pool_ring_unlock(struct page_pool *pool) spin_unlock_bh(&pool->ring.producer_lock); } +/* Store mem_info on struct page and use it while recycling skb frags */ +static inline +void page_pool_store_mem_info(struct page *page, struct xdp_mem_info *mem) +{ + u32 *xmi = (u32 *)mem; + + set_page_private(page, *xmi); +} + #endif /* _NET_PAGE_POOL_H */ diff --git a/include/net/xdp.h b/include/net/xdp.h index c35864d59113..5d7316f1f195 100644 --- a/include/net/xdp.h +++ b/include/net/xdp.h @@ -235,6 +235,7 @@ void xdp_return_buff(struct xdp_buff *xdp); void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq); void xdp_return_frame_bulk(struct xdp_frame *xdpf, struct xdp_frame_bulk *bq); +void xdp_return_skb_frame(void *data, struct xdp_mem_info *mem); /* When sending xdp_frame into the network stack, then there is no * return point callback, which is needed to release e.g. DMA-mapping diff --git a/net/core/page_pool.c b/net/core/page_pool.c index 2ae9b554ef98..43bfd2e3d8df 100644 --- a/net/core/page_pool.c +++ b/net/core/page_pool.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include @@ -17,12 +18,19 @@ #include #include #include /* for __put_page() */ +#include #include #define DEFER_TIME (msecs_to_jiffies(1000)) #define DEFER_WARN_INTERVAL (60 * HZ) +/* Used to store/retrieve hi/lo bytes from xdp_mem_info to page->private */ +union page_pool_xmi { + u32 raw; + struct xdp_mem_info mem_info; +}; + static int page_pool_init(struct page_pool *pool, const struct page_pool_params *params) { @@ -587,3 +595,38 @@ void page_pool_update_nid(struct page_pool *pool, int new_nid) } } EXPORT_SYMBOL(page_pool_update_nid); + +bool page_pool_return_skb_page(void *data) +{ + struct xdp_mem_info mem_info; + union page_pool_xmi info; + struct page *page; + + page = virt_to_head_page(data); + if (unlikely(page->signature != PP_SIGNATURE)) + return false; + + info.raw = page_private(page); + mem_info = info.mem_info; + + /* If a buffer is marked for recycle and does not belong to + * MEM_TYPE_PAGE_POOL, the buffers will be eventually freed from the + * network stack and kfree_skb, but the DMA region will *not* be + * correctly unmapped. WARN here for the recycling misusage + */ + if (unlikely(mem_info.type != MEM_TYPE_PAGE_POOL)) { + WARN_ONCE(true, "Tried to recycle non MEM_TYPE_PAGE_POOL"); + return false; + } + + /* Driver set this to memory recycling info. Reset it on recycle + * This will *not* work for NIC using a split-page memory model. + * The page will be returned to the pool here regardless of the + * 'flipped' fragment being in use or not + */ + set_page_private(page, 0); + xdp_return_skb_frame(data, &mem_info); + + return true; +} +EXPORT_SYMBOL(page_pool_return_skb_page); diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 3ad9e8425ab2..650f517565dd 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -69,6 +69,9 @@ #include #include #include +#if IS_BUILTIN(CONFIG_PAGE_POOL) +#include +#endif #include #include @@ -644,6 +647,11 @@ static void skb_free_head(struct sk_buff *skb) { unsigned char *head = skb->head; +#if IS_BUILTIN(CONFIG_PAGE_POOL) + if (skb->pp_recycle && page_pool_return_skb_page(head)) + return; +#endif + if (skb->head_frag) skb_free_frag(head); else @@ -663,7 +671,7 @@ static void skb_release_data(struct sk_buff *skb) skb_zcopy_clear(skb, true); for (i = 0; i < shinfo->nr_frags; i++) - __skb_frag_unref(&shinfo->frags[i]); + __skb_frag_unref(&shinfo->frags[i], skb->pp_recycle); if (shinfo->frag_list) kfree_skb_list(shinfo->frag_list); @@ -1045,6 +1053,7 @@ static struct sk_buff *__skb_clone(struct sk_buff *n, struct sk_buff *skb) n->nohdr = 0; n->peeked = 0; C(pfmemalloc); + C(pp_recycle); n->destructor = NULL; C(tail); C(end); @@ -3494,7 +3503,7 @@ int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, int shiftlen) fragto = &skb_shinfo(tgt)->frags[merge]; skb_frag_size_add(fragto, skb_frag_size(fragfrom)); - __skb_frag_unref(fragfrom); + __skb_frag_unref(fragfrom, skb->pp_recycle); } /* Reposition in the original skb */ @@ -5275,6 +5284,13 @@ bool skb_try_coalesce(struct sk_buff *to, struct sk_buff *from, if (skb_cloned(to)) return false; + /* We can't coalesce skb that are allocated from slab and page_pool + * The recycle mark is on the skb, so that might end up trying to + * recycle slab allocated skb->head + */ + if (to->pp_recycle != from->pp_recycle) + return false; + if (len <= skb_tailroom(to)) { if (len) BUG_ON(skb_copy_bits(from, 0, skb_put(to, len), len)); diff --git a/net/core/xdp.c b/net/core/xdp.c index 3dd47ed83778..d89b827e54a9 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -372,6 +372,12 @@ static void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct, } } +void xdp_return_skb_frame(void *data, struct xdp_mem_info *mem) +{ + __xdp_return(data, mem, false, NULL); +} +EXPORT_SYMBOL_GPL(xdp_return_skb_frame); + void xdp_return_frame(struct xdp_frame *xdpf) { __xdp_return(xdpf->data, &xdpf->mem, false, NULL); diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c index 790c6b7ecb26..8027a58c76a2 100644 --- a/net/tls/tls_device.c +++ b/net/tls/tls_device.c @@ -127,7 +127,7 @@ static void destroy_record(struct tls_record_info *record) int i; for (i = 0; i < record->num_frags; i++) - __skb_frag_unref(&record->frags[i]); + __skb_frag_unref(&record->frags[i], false); kfree(record); } From patchwork Fri Apr 9 22:38:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Croce X-Patchwork-Id: 12195165 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 38CFFC433B4 for ; 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[93.66.21.119]) by smtp.gmail.com with ESMTPSA id s20sm2108726edu.93.2021.04.09.15.39.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Apr 2021 15:39:02 -0700 (PDT) From: Matteo Croce To: netdev@vger.kernel.org, linux-mm@kvack.org Cc: Ayush Sawal , Vinay Kumar Yadav , Rohit Maheshwari , "David S. Miller" , Jakub Kicinski , Thomas Petazzoni , Marcin Wojtas , Russell King , Mirko Lindner , Stephen Hemminger , Tariq Toukan , Jesper Dangaard Brouer , Ilias Apalodimas , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Boris Pismenny , Arnd Bergmann , Andrew Morton , "Peter Zijlstra (Intel)" , Vlastimil Babka , Yu Zhao , Will Deacon , Michel Lespinasse , Fenghua Yu , Roman Gushchin , Hugh Dickins , Peter Xu , Jason Gunthorpe , Guoqing Jiang , Jonathan Lemon , Alexander Lobakin , Cong Wang , wenxu , Kevin Hao , Aleksandr Nogikh , Jakub Sitnicki , Marco Elver , Willem de Bruijn , Miaohe Lin , Yunsheng Lin , Guillaume Nault , linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, bpf@vger.kernel.org, Matthew Wilcox , Eric Dumazet , David Ahern , Lorenzo Bianconi , Saeed Mahameed , Andrew Lunn , Paolo Abeni Subject: [PATCH net-next v3 4/5] mvpp2: recycle buffers Date: Sat, 10 Apr 2021 00:38:00 +0200 Message-Id: <20210409223801.104657-5-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210409223801.104657-1-mcroce@linux.microsoft.com> References: <20210409223801.104657-1-mcroce@linux.microsoft.com> MIME-Version: 1.0 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 493EF600010D X-Stat-Signature: q65thisdtbzi7x7pe74w1swc7y8ud5s5 Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf09; identity=mailfrom; envelope-from=""; helo=mail-ed1-f49.google.com; client-ip=209.85.208.49 X-HE-DKIM-Result: none/none X-HE-Tag: 1618007941-589664 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Matteo Croce Use the new recycling API for page_pool. In a drop rate test, the packet rate is more than doubled, from 962 Kpps to 2047 Kpps. perf top on a stock system shows: Overhead Shared Object Symbol 30.67% [kernel] [k] page_pool_release_page 8.37% [kernel] [k] get_page_from_freelist 7.34% [kernel] [k] free_unref_page 6.47% [mvpp2] [k] mvpp2_rx 4.69% [kernel] [k] eth_type_trans 4.55% [kernel] [k] __netif_receive_skb_core 4.40% [kernel] [k] build_skb 4.29% [kernel] [k] kmem_cache_free 4.00% [kernel] [k] kmem_cache_alloc 3.81% [kernel] [k] dev_gro_receive With packet rate stable at 962 Kpps: tx: 0 bps 0 pps rx: 477.4 Mbps 962.6 Kpps tx: 0 bps 0 pps rx: 477.6 Mbps 962.8 Kpps tx: 0 bps 0 pps rx: 477.6 Mbps 962.9 Kpps tx: 0 bps 0 pps rx: 477.2 Mbps 962.1 Kpps tx: 0 bps 0 pps rx: 477.5 Mbps 962.7 Kpps And this is the same output with recycling enabled: Overhead Shared Object Symbol 12.75% [mvpp2] [k] mvpp2_rx 9.56% [kernel] [k] __netif_receive_skb_core 9.29% [kernel] [k] build_skb 9.27% [kernel] [k] eth_type_trans 8.39% [kernel] [k] kmem_cache_alloc 7.85% [kernel] [k] kmem_cache_free 7.36% [kernel] [k] page_pool_put_page 6.45% [kernel] [k] dev_gro_receive 4.72% [kernel] [k] __xdp_return 3.06% [kernel] [k] page_pool_refill_alloc_cache With packet rate above 2000 Kpps: tx: 0 bps 0 pps rx: 1015 Mbps 2046 Kpps tx: 0 bps 0 pps rx: 1015 Mbps 2047 Kpps tx: 0 bps 0 pps rx: 1015 Mbps 2047 Kpps tx: 0 bps 0 pps rx: 1015 Mbps 2047 Kpps tx: 0 bps 0 pps rx: 1015 Mbps 2047 Kpps The major performance increase is explained by the fact that the most CPU consuming functions (page_pool_release_page, get_page_from_freelist and free_unref_page) are no longer called on a per packet basis. The test was done by sending to the macchiatobin 64 byte ethernet frames with an invalid ethertype, so the packets are dropped early in the RX path. Signed-off-by: Matteo Croce --- drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c index ec706d614cac..633b39cfef65 100644 --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c @@ -3847,6 +3847,7 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi, struct mvpp2_pcpu_stats ps = {}; enum dma_data_direction dma_dir; struct bpf_prog *xdp_prog; + struct xdp_rxq_info *rxqi; struct xdp_buff xdp; int rx_received; int rx_done = 0; @@ -3912,15 +3913,15 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi, else frag_size = bm_pool->frag_size; - if (xdp_prog) { - struct xdp_rxq_info *xdp_rxq; + if (bm_pool->pkt_size == MVPP2_BM_SHORT_PKT_SIZE) + rxqi = &rxq->xdp_rxq_short; + else + rxqi = &rxq->xdp_rxq_long; - if (bm_pool->pkt_size == MVPP2_BM_SHORT_PKT_SIZE) - xdp_rxq = &rxq->xdp_rxq_short; - else - xdp_rxq = &rxq->xdp_rxq_long; + if (xdp_prog) { + xdp.rxq = rxqi; - xdp_init_buff(&xdp, PAGE_SIZE, xdp_rxq); + xdp_init_buff(&xdp, PAGE_SIZE, rxqi); xdp_prepare_buff(&xdp, data, MVPP2_MH_SIZE + MVPP2_SKB_HEADROOM, rx_bytes, false); @@ -3964,7 +3965,7 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi, } if (pp) - page_pool_release_page(pp, virt_to_page(data)); + skb_mark_for_recycle(skb, virt_to_page(data), &rxqi->mem); else dma_unmap_single_attrs(dev->dev.parent, dma_addr, bm_pool->buf_size, DMA_FROM_DEVICE, From patchwork Fri Apr 9 22:38:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Croce X-Patchwork-Id: 12195167 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 94AA1C433B4 for ; Fri, 9 Apr 2021 22:39:19 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 32303611AE for ; Fri, 9 Apr 2021 22:39:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 32303611AE Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id C6B2D6B0070; Fri, 9 Apr 2021 18:39:18 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id C1A406B0078; Fri, 9 Apr 2021 18:39:18 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A6D026B007B; Fri, 9 Apr 2021 18:39:18 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 84DDF6B0070 for ; Fri, 9 Apr 2021 18:39:18 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 46A86BA10 for ; Fri, 9 Apr 2021 22:39:18 +0000 (UTC) X-FDA: 78014295996.20.B88B806 Received: from mail-ed1-f45.google.com (mail-ed1-f45.google.com [209.85.208.45]) by imf14.hostedemail.com (Postfix) with ESMTP id 26905C0001EE for ; Fri, 9 Apr 2021 22:39:12 +0000 (UTC) Received: by mail-ed1-f45.google.com with SMTP id w18so8342997edc.0 for ; Fri, 09 Apr 2021 15:39:17 -0700 (PDT) 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=Hfpx7yH1JMhtuw/p34rqv49BJ0OaG3mtjrffrkk1xkI=; b=o5smfWTBeSWz+1K9iKWeD4yaaW9jvNd0ya7vOOtleEq7dsa6W1uWQ9d2xekzU96UjG LsI5aoewbmudKIjK83XOmi5DmdjNJCSDcIO/RMZfB1WZpE30HMCcmxhYMGemor+ON5K2 nGvXlfz+fdMLl0SJQEgtXl5w85dA8v8Au8eL9t+yzSDjqfy2Dfs/Nha4d3PIz+C+vTjB gGURb5ilbjhlDv7d+GCkP7Ewi1ZNZTi9J28FCeMjpzlCFE95hqHodkgTbGQH974PDffk gYogc6QTMFDdXOxUY2NJC8rl9hY6PF+96INZt+f537eAGvIH2xPRkO9lZl6LRNX3EdJp ihWQ== X-Gm-Message-State: AOAM532VmaYRYGvhFZAUx6iQILHbmspkW3ECxCpjDS2l7sGkI6Fj97E5 Nv2/nbKXQ9+sD0MgdbNxRx0= X-Google-Smtp-Source: ABdhPJz5JORSKeWDpQgyWZS0/602VxwB/8eehkCneeNRCOvKRKPhoJLWpkp3+nG3FTnrzj9BVIHxxg== X-Received: by 2002:a05:6402:3495:: with SMTP id v21mr19447203edc.117.1618007956846; Fri, 09 Apr 2021 15:39:16 -0700 (PDT) Received: from msft-t490s.teknoraver.net (net-93-66-21-119.cust.vodafonedsl.it. [93.66.21.119]) by smtp.gmail.com with ESMTPSA id s20sm2108726edu.93.2021.04.09.15.39.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Apr 2021 15:39:16 -0700 (PDT) From: Matteo Croce To: netdev@vger.kernel.org, linux-mm@kvack.org Cc: Ayush Sawal , Vinay Kumar Yadav , Rohit Maheshwari , "David S. Miller" , Jakub Kicinski , Thomas Petazzoni , Marcin Wojtas , Russell King , Mirko Lindner , Stephen Hemminger , Tariq Toukan , Jesper Dangaard Brouer , Ilias Apalodimas , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Boris Pismenny , Arnd Bergmann , Andrew Morton , "Peter Zijlstra (Intel)" , Vlastimil Babka , Yu Zhao , Will Deacon , Michel Lespinasse , Fenghua Yu , Roman Gushchin , Hugh Dickins , Peter Xu , Jason Gunthorpe , Guoqing Jiang , Jonathan Lemon , Alexander Lobakin , Cong Wang , wenxu , Kevin Hao , Aleksandr Nogikh , Jakub Sitnicki , Marco Elver , Willem de Bruijn , Miaohe Lin , Yunsheng Lin , Guillaume Nault , linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, bpf@vger.kernel.org, Matthew Wilcox , Eric Dumazet , David Ahern , Lorenzo Bianconi , Saeed Mahameed , Andrew Lunn , Paolo Abeni Subject: [PATCH net-next v3 5/5] mvneta: recycle buffers Date: Sat, 10 Apr 2021 00:38:01 +0200 Message-Id: <20210409223801.104657-6-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210409223801.104657-1-mcroce@linux.microsoft.com> References: <20210409223801.104657-1-mcroce@linux.microsoft.com> MIME-Version: 1.0 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 26905C0001EE X-Stat-Signature: hbd57ya754bachni5fej8nja14pr9xtb Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf14; identity=mailfrom; envelope-from=""; helo=mail-ed1-f45.google.com; client-ip=209.85.208.45 X-HE-DKIM-Result: none/none X-HE-Tag: 1618007952-84622 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Matteo Croce Use the new recycling API for page_pool. In a drop rate test, the packet rate increased di 10%, from 269 Kpps to 296 Kpps. perf top on a stock system shows: Overhead Shared Object Symbol 21.78% [kernel] [k] __pi___inval_dcache_area 21.66% [mvneta] [k] mvneta_rx_swbm 7.00% [kernel] [k] kmem_cache_alloc 6.05% [kernel] [k] eth_type_trans 4.44% [kernel] [k] kmem_cache_free.part.0 3.80% [kernel] [k] __netif_receive_skb_core 3.68% [kernel] [k] dev_gro_receive 3.65% [kernel] [k] get_page_from_freelist 3.43% [kernel] [k] page_pool_release_page 3.35% [kernel] [k] free_unref_page And this is the same output with recycling enabled: Overhead Shared Object Symbol 24.10% [kernel] [k] __pi___inval_dcache_area 23.02% [mvneta] [k] mvneta_rx_swbm 7.19% [kernel] [k] kmem_cache_alloc 6.50% [kernel] [k] eth_type_trans 4.93% [kernel] [k] __netif_receive_skb_core 4.77% [kernel] [k] kmem_cache_free.part.0 3.93% [kernel] [k] dev_gro_receive 3.03% [kernel] [k] build_skb 2.91% [kernel] [k] page_pool_put_page 2.85% [kernel] [k] __xdp_return The test was done with mausezahn on the TX side with 64 byte raw ethernet frames. Signed-off-by: Matteo Croce --- drivers/net/ethernet/marvell/mvneta.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index f20dfd1d7a6b..f88c189b60a4 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -2331,7 +2331,7 @@ mvneta_swbm_build_skb(struct mvneta_port *pp, struct mvneta_rx_queue *rxq, if (!skb) return ERR_PTR(-ENOMEM); - page_pool_release_page(rxq->page_pool, virt_to_page(xdp->data)); + skb_mark_for_recycle(skb, virt_to_page(xdp->data), &xdp->rxq->mem); skb_reserve(skb, xdp->data - xdp->data_hard_start); skb_put(skb, xdp->data_end - xdp->data); @@ -2343,7 +2343,10 @@ mvneta_swbm_build_skb(struct mvneta_port *pp, struct mvneta_rx_queue *rxq, skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, skb_frag_page(frag), skb_frag_off(frag), skb_frag_size(frag), PAGE_SIZE); - page_pool_release_page(rxq->page_pool, skb_frag_page(frag)); + /* We don't need to reset pp_recycle here. It's already set, so + * just mark fragments for recycling. + */ + page_pool_store_mem_info(skb_frag_page(frag), &xdp->rxq->mem); } return skb;