From patchwork Fri Apr 9 22:37:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Croce X-Patchwork-Id: 418638 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 1EE55C43460 for ; Fri, 9 Apr 2021 22:38:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EEFB761181 for ; Fri, 9 Apr 2021 22:38:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235277AbhDIWix (ORCPT ); Fri, 9 Apr 2021 18:38:53 -0400 Received: from mail-ej1-f54.google.com ([209.85.218.54]:41907 "EHLO mail-ej1-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234602AbhDIWiu (ORCPT ); Fri, 9 Apr 2021 18:38:50 -0400 Received: by mail-ej1-f54.google.com with SMTP id g17so8223581ejp.8; Fri, 09 Apr 2021 15:38:36 -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=MDJPl/myf2AZgAwuJjMBhWk6pfLHyNCg5mhMjK7qfm2mLiXx/A9XoQhXloOOf4LGkn 53vW/FmHMwWPCBwPI3wheZ5VDKq2BFNWEdh5rSaSv9gtJdxPZRg8W5r5B/4zuSVash/A PJRBHjkQRG/XjQn2X3x45djtx++ZYgObD0W6X+Pop7E2M/jDmkq1pvzMcgcfqnQ43jh+ Ttg2wFetjLyIWIpm3ZONTyLR4V0X6mQL7T7BV0R0wNBZ5rVcNrgEedl553XuaUDQVuC+ kvkmtUkvWO/90MTteiSdOn6sju+C5f+viLBtzl2USOaS+Z2qDjiPkuvi852X2Kp8d+6f s0jA== X-Gm-Message-State: AOAM532Bu3ACDFh50oZWReuhk5OfYcyiOMFAft6X60gR0OVvA+taK4UF G0M6wDdxoT/hnwfwnhJEZFTSLo24GX8PiA== X-Google-Smtp-Source: ABdhPJxw/xKPMPcoWnc0Xwnb5N/pYOuckTTq0yj9tph5v/fPkzmO94ANO8HgYyDIdQekYGgL1qsvbA== X-Received: by 2002:a17:907:3c08:: with SMTP id gh8mr4361500ejc.439.1618007916135; Fri, 09 Apr 2021 15:38:36 -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.93.2021.04.09.15.38.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Apr 2021 15:38:35 -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 2/5] mm: add a signature in struct page Date: Sat, 10 Apr 2021 00:37:58 +0200 Message-Id: <20210409223801.104657-3-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 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.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 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: 418197 Delivered-To: patch@linaro.org Received: by 2002:a02:8562:0:0:0:0:0 with SMTP id g89csp1947094jai; Fri, 9 Apr 2021 15:38:51 -0700 (PDT) X-Google-Smtp-Source: ABdhPJznoxuvupZQOl3QvfmBPhbqtEREynIHF3xHwvyR5oAk4uQ8K718EhFcJeFjjjqjgqyYEjDO X-Received: by 2002:a05:6402:13ce:: with SMTP id a14mr19647390edx.365.1618007931158; Fri, 09 Apr 2021 15:38:51 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1618007931; cv=none; d=google.com; s=arc-20160816; b=wJS/AUw5cE6uN83ZwYwPwAh8DVXSfpEQTFqLce47x/kMYLqe50w7CSFSfeTJ6Rthx9 UHwNfI9dcCCVg37uz9KsqOEvh7vSjN+xgKcpmVLvooGqPzAuGFPvqDxCJ2H5j+isE7Yi CWusd7SyCNMtiqqa4FcEiBWaUtLtIDNQk5knVeavErpblAv/BlExHOOfN68bkObvNgDw WRSCh+uTYZSaDbrDQmnwzKzTQAob0jrEpWZUUxeN6StyXS4Lu6rSeMcLyMUoW+4VMlvd 6BijcuAZLZyxfFQRe/s7MHEWYvzgv3izvCaXNdCC88teE5gMke/yjMvAMAyO5uIt7XRm D9Jg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from; bh=WnPKFMtfhSLVnqHsKOr4n3p6UHXAjM0KTUn3EX9S5lk=; b=xTdf7oWbZCQisgMZG0D87AYcZJ5C2tjug0g/BVori38eoYjZhJ9m02yp8loj9m4+Jl mTV2NdgcrLKFP/NzS1UpyMvNLqHVYARBTf/Qg9pBnsAMaf30znkpdMaJMnQpHb7L/oYF eyoHBTa42P5aWrnLt2lEz3jGDUcmkfb+ZsqTUMO4cSUrgrvvWnv7QvQ1K7mOjt7sU67i puacIITvTL9XyT9DDM/LhHXaFmGswaEZawVxSyTsX3d2TAG/Ec84DYER3LajBLuihaip YgvZCHAALcTBZMPl+lheGXgqfGWKYdkMvl9sEIHySLsZJVFT46fdBt1glrce8YMh6FUD Ljmg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=netdev-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linux.microsoft.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. 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[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 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.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: 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(-) -- 2.30.2 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: 418637 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 8EB60C43462 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 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.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,