From patchwork Fri Apr 2 18:17:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Croce X-Patchwork-Id: 12181379 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=-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 36282C433ED for ; Fri, 2 Apr 2021 18:17:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 148BF61167 for ; Fri, 2 Apr 2021 18:17:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236187AbhDBSRz (ORCPT ); Fri, 2 Apr 2021 14:17:55 -0400 Received: from mail-wr1-f46.google.com ([209.85.221.46]:38463 "EHLO mail-wr1-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236043AbhDBSRy (ORCPT ); Fri, 2 Apr 2021 14:17:54 -0400 Received: by mail-wr1-f46.google.com with SMTP id i18so1925199wrm.5; Fri, 02 Apr 2021 11:17:52 -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=c4ZUXpuHepMniyq2pPmAdvX1uKehqSHeq47srWOIqXa38aqMLPNfjvkXLgzKt+fGaS 8WWYJ/SbVwZijAj5eee9kbdy/BRYOMyESqBYbA4V/VIxus6v1AJqegDvITcjXhp814c/ +tDnX5mW0rYDJ2CZGMmMRRZVOg21C8ZusAVRFTvNRPWczMxOfU6XgfJI2Xuef41XQ/qG 0eGd8h8My2mhV3ru0mMMOenAbFC4OXpJncqs0PfDFYe3wa9O1o3gXnTSP8Rvj1d6R1Ug ki0W+L5PqMPXCRFMU01+0iXAQ16XvuLxUP6F8a5LWejtyykyYaKkYpmuGTCf7SOIP9Kx YE7Q== X-Gm-Message-State: AOAM533SgBCezNIBA58dQBQmh28ACVsExFHTaHCL45gpoWm6MX0cy1yr PJri1EMwYMXYqbOuzkvfIGTSEN0SZ+I= X-Google-Smtp-Source: ABdhPJxsviGRHcvDlacbJZu7qC82VCXMYNfPjsdToe0jC9OVA1nnVVuhpe6OFpIWBN40LYGh9j8Scg== X-Received: by 2002:a05:6000:2c7:: with SMTP id o7mr16082046wry.78.1617387471672; Fri, 02 Apr 2021 11:17:51 -0700 (PDT) Received: from msft-t490s.teknoraver.net (net-2-34-63-208.cust.vodafonedsl.it. [2.34.63.208]) by smtp.gmail.com with ESMTPSA id l9sm11472831wmq.2.2021.04.02.11.17.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Apr 2021 11:17:51 -0700 (PDT) From: Matteo Croce To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Jonathan Lemon , "David S. Miller" , Ilias Apalodimas , Jesper Dangaard Brouer , Lorenzo Bianconi , Saeed Mahameed , David Ahern , Saeed Mahameed , Andrew Lunn Subject: [PATCH net-next v2 1/5] xdp: reduce size of struct xdp_mem_info Date: Fri, 2 Apr 2021 20:17:29 +0200 Message-Id: <20210402181733.32250-2-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210402181733.32250-1-mcroce@linux.microsoft.com> References: <20210402181733.32250-1-mcroce@linux.microsoft.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org 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 2 18:17:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Croce X-Patchwork-Id: 12181381 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=-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 DEC23C433B4 for ; Fri, 2 Apr 2021 18:18:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B16CE6115B for ; Fri, 2 Apr 2021 18:18:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236251AbhDBSSO (ORCPT ); Fri, 2 Apr 2021 14:18:14 -0400 Received: from mail-wr1-f42.google.com ([209.85.221.42]:39870 "EHLO mail-wr1-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236043AbhDBSSN (ORCPT ); Fri, 2 Apr 2021 14:18:13 -0400 Received: by mail-wr1-f42.google.com with SMTP id e18so5383757wrt.6; Fri, 02 Apr 2021 11:18:11 -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=vTaN//8xhOW6+dxdPY1I1bInoY8eqI/bBr1slqBlUSQ=; b=PMsEUT3LX3i9ZY6wuGFYmadxrBRvH9klkiND76AoRjZNGWixLWLLHvSXOHpFbdhhf0 qTXeB0MBjO6pMPh9wS3ry6DeIkptNHAkgKoGpBzLp6KgblzsSGPI3GVNZGpxAxvYqW/z RXNuwmCVZUCJsmX45sgpP8cQyzF8Z58AmTeTGaKqHc1yayXk15lfAz8jaDqjyZhAjakw Pk9U40ghcwHDs50TCcXWBKnTeZ1ZztWq9+DP385bSYUNGWATAojZ68Q0LeUbhs1g29YA Mt3KAh7hmZhd51d9MeimVmaWkXplM0ehMyY7YgOEbkkoxSl7D3ERld+gvHUVVc/bCsR7 VXOA== X-Gm-Message-State: AOAM5333tJFJavtLmM5uL2nJrxFuOlsDNj7ihujGCIDkzE4Ffu7a+pbx DrPLLmztuKENlcYXqHRvOXjqFY0DMek= X-Google-Smtp-Source: ABdhPJzdQxmSHNopopptWYYFZgbCL2iTiZL0ut4i0AvqkAyvsxFGXDMSUur76yIw4kq9Lm8L3WstWw== X-Received: by 2002:adf:fa8d:: with SMTP id h13mr16321490wrr.331.1617387490714; Fri, 02 Apr 2021 11:18:10 -0700 (PDT) Received: from msft-t490s.teknoraver.net (net-2-34-63-208.cust.vodafonedsl.it. [2.34.63.208]) by smtp.gmail.com with ESMTPSA id l9sm11472831wmq.2.2021.04.02.11.18.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Apr 2021 11:18:10 -0700 (PDT) From: Matteo Croce To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Jonathan Lemon , "David S. Miller" , Ilias Apalodimas , Jesper Dangaard Brouer , Lorenzo Bianconi , Saeed Mahameed , David Ahern , Saeed Mahameed , Andrew Lunn Subject: [PATCH net-next v2 2/5] mm: add a signature in struct page Date: Fri, 2 Apr 2021 20:17:30 +0200 Message-Id: <20210402181733.32250-3-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210402181733.32250-1-mcroce@linux.microsoft.com> References: <20210402181733.32250-1-mcroce@linux.microsoft.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Matteo Croce This is needed by the page_pool to avoid recycling a page not allocated via page_pool. Signed-off-by: Matteo Croce --- include/linux/mm_types.h | 1 + include/net/page_pool.h | 2 ++ net/core/page_pool.c | 4 ++++ 3 files changed, 7 insertions(+) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 6613b26a8894..ef2d0d5f62e4 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -101,6 +101,7 @@ struct page { * 32-bit architectures. */ dma_addr_t dma_addr; + unsigned long signature; }; struct { /* slab, slob and slub */ union { diff --git a/include/net/page_pool.h b/include/net/page_pool.h index b5b195305346..b30405e84b5e 100644 --- a/include/net/page_pool.h +++ b/include/net/page_pool.h @@ -63,6 +63,8 @@ */ #define PP_ALLOC_CACHE_SIZE 128 #define PP_ALLOC_CACHE_REFILL 64 +#define PP_SIGNATURE 0x20210303 + struct pp_alloc_cache { u32 count; void *cache[PP_ALLOC_CACHE_SIZE]; diff --git a/net/core/page_pool.c b/net/core/page_pool.c index ad8b0707af04..2ae9b554ef98 100644 --- a/net/core/page_pool.c +++ b/net/core/page_pool.c @@ -232,6 +232,8 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool, page_pool_dma_sync_for_device(pool, page, pool->p.max_len); skip_dma_map: + page->signature = PP_SIGNATURE; + /* Track how many pages are held 'in-flight' */ pool->pages_state_hold_cnt++; @@ -302,6 +304,8 @@ void page_pool_release_page(struct page_pool *pool, struct page *page) DMA_ATTR_SKIP_CPU_SYNC); page->dma_addr = 0; skip_dma_unmap: + page->signature = 0; + /* This may be the last page returned, releasing the pool, so * it is not safe to reference pool afterwards. */ From patchwork Fri Apr 2 18:17:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Croce X-Patchwork-Id: 12181383 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=-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 2FB66C433B4 for ; Fri, 2 Apr 2021 18:19:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0227B610C7 for ; Fri, 2 Apr 2021 18:19:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236372AbhDBSTO (ORCPT ); Fri, 2 Apr 2021 14:19:14 -0400 Received: from mail-wr1-f52.google.com ([209.85.221.52]:43780 "EHLO mail-wr1-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236369AbhDBSTM (ORCPT ); Fri, 2 Apr 2021 14:19:12 -0400 Received: by mail-wr1-f52.google.com with SMTP id x7so5379347wrw.10; Fri, 02 Apr 2021 11:19:10 -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=o3wzGh9vGLYWYjwylXZp2xb9w68VYpm2gnGS0s4kqDE=; b=GcyUcKenI021zP/VkYUFKFvJWQN97YhIR9w7WZPo5tT6hkvzD3pXZMqR4b7KFhZR1I 2Ul8lorjayqjxyQXRYowof6ZOe5YzYTSP2kKQjQOMDSSFSNAuM81jbK5B9Ic5RadMj8H PAT7/HiqO/y9ZuDH2cEQLqd83o/iX6N081lrFa9Zy76fCUupR2HqMXvNKwspFJDDLQTb Z5JkNkdsh5AHESHmG/tUzyRHY8/TiBqpM1lsSokkuS1wXmNtxI5Vk27l0P41Lyn276uK ehlT3caQc4SpUhiRvgmZdgT5Jjxzb04N7VfBeyh/HrMsloagysV3SOKNZxVjegeV2Jah pVmw== X-Gm-Message-State: AOAM533KxPt8BveyFx9VCjiNnjRzaVzCc+QXzUx6d/guyyGriHa3NcIW nysIyHQLoNRSI0+fkMoWtalG6eDQRzA= X-Google-Smtp-Source: ABdhPJylnWP0koULEuwlsdz6+AAuGaDB1Xz6oD9gJYbhf9noyHXbXVLCMmC+eSKabX1JHheK6yGOWQ== X-Received: by 2002:a05:6000:1b0f:: with SMTP id f15mr16694590wrz.171.1617387549934; Fri, 02 Apr 2021 11:19:09 -0700 (PDT) Received: from msft-t490s.teknoraver.net (net-2-34-63-208.cust.vodafonedsl.it. [2.34.63.208]) by smtp.gmail.com with ESMTPSA id l9sm11472831wmq.2.2021.04.02.11.19.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Apr 2021 11:19:09 -0700 (PDT) From: Matteo Croce To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Jonathan Lemon , "David S. Miller" , Ilias Apalodimas , Jesper Dangaard Brouer , Lorenzo Bianconi , Saeed Mahameed , David Ahern , Saeed Mahameed , Andrew Lunn Subject: [PATCH net-next v2 3/5] page_pool: Allow drivers to hint on SKB recycling Date: Fri, 2 Apr 2021 20:17:31 +0200 Message-Id: <20210402181733.32250-4-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210402181733.32250-1-mcroce@linux.microsoft.com> References: <20210402181733.32250-1-mcroce@linux.microsoft.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org 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: Ilias Apalodimas Signed-off-by: Jesper Dangaard Brouer --- .../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 c8def85fcc22..fffa6b399995 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); } /** @@ -4696,5 +4712,14 @@ 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 e8320b5d651a..7f5c02085438 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); @@ -3453,7 +3462,7 @@ 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 */ @@ -5234,6 +5243,13 @@ 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 2 18:17:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Croce X-Patchwork-Id: 12181385 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=-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 580E0C433B4 for ; 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[2.34.63.208]) by smtp.gmail.com with ESMTPSA id l9sm11472831wmq.2.2021.04.02.11.20.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Apr 2021 11:20:33 -0700 (PDT) From: Matteo Croce To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Jonathan Lemon , "David S. Miller" , Ilias Apalodimas , Jesper Dangaard Brouer , Lorenzo Bianconi , Saeed Mahameed , David Ahern , Saeed Mahameed , Andrew Lunn Subject: [PATCH net-next v2 4/5] mvpp2: recycle buffers Date: Fri, 2 Apr 2021 20:17:32 +0200 Message-Id: <20210402181733.32250-5-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210402181733.32250-1-mcroce@linux.microsoft.com> References: <20210402181733.32250-1-mcroce@linux.microsoft.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org 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 2 18:17:33 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Croce X-Patchwork-Id: 12181387 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=-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 C5088C43461 for ; Fri, 2 Apr 2021 18:20:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A527E61175 for ; Fri, 2 Apr 2021 18:20:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236339AbhDBSUy (ORCPT ); Fri, 2 Apr 2021 14:20:54 -0400 Received: from mail-wr1-f47.google.com ([209.85.221.47]:39564 "EHLO mail-wr1-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235247AbhDBSUx (ORCPT ); Fri, 2 Apr 2021 14:20:53 -0400 Received: by mail-wr1-f47.google.com with SMTP id e18so5388644wrt.6; Fri, 02 Apr 2021 11:20:52 -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=Tj9XhcQL7k3M9glHfKJa1ov3CkKFHXHVkE0AzAirwiAYMcJ/Q4gdujj3TMc36RiZOY 8HOjErS7vMCR5KJ9049JucUE6HHdJGPLR9kJLYaF8AwLNLJcAYeDx3kjg2R/r+YAuEFZ fgPgR0BDUnRKZvlBBuhlxmG9MM+NBqG7RiuLHBypHy+UQmtQngvvrbMt73YtBTyjJI0B TpWoCnWfqtU1RKxj8Q+AWf1CUgwPMlSTxtznAmJvSlC9FW+4yXGXyNyayRCxu8+mHqbS M8VGrbVBkVDWDietdwpzL0UEsZo9AJPCLALlY0ah/xYZtlVZbH0LgEBPlV9+rvUMDQk+ 88rQ== X-Gm-Message-State: AOAM532BaTAPbgTPC6AiYCpyApl5SLiFUsmca99FRAZaJt6ILWP8b1+o Q3RwhYUq8g01lIkP2jjA2HyoWcoAmtU= X-Google-Smtp-Source: ABdhPJz4F+hOXmJCdVlQqFr60RgK//dTrF6RsVR8NEENtULfEy9P666rej4u+J51eUPB7k+8SIqYmg== X-Received: by 2002:adf:fb0b:: with SMTP id c11mr16645225wrr.425.1617387651263; Fri, 02 Apr 2021 11:20:51 -0700 (PDT) Received: from msft-t490s.teknoraver.net (net-2-34-63-208.cust.vodafonedsl.it. [2.34.63.208]) by smtp.gmail.com with ESMTPSA id l9sm11472831wmq.2.2021.04.02.11.20.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Apr 2021 11:20:50 -0700 (PDT) From: Matteo Croce To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Jonathan Lemon , "David S. Miller" , Ilias Apalodimas , Jesper Dangaard Brouer , Lorenzo Bianconi , Saeed Mahameed , David Ahern , Saeed Mahameed , Andrew Lunn Subject: [PATCH net-next v2 5/5] mvneta: recycle buffers Date: Fri, 2 Apr 2021 20:17:33 +0200 Message-Id: <20210402181733.32250-6-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210402181733.32250-1-mcroce@linux.microsoft.com> References: <20210402181733.32250-1-mcroce@linux.microsoft.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org 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;