From patchwork Thu Nov 7 16:10:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Alexander Lobakin X-Patchwork-Id: 13866702 X-Patchwork-Delegate: kuba@kernel.org Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.13]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 834C9219480; Thu, 7 Nov 2024 16:14:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.13 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730996063; cv=none; b=AWYgI18Q3PqdrN+sZSQwrRAlBpC+1S1bo/9WwXEpyNwUWs5tY/lefIudZ08l7u3/HWPa11qh86AWhr8wGdi59kzUFGenMRflqYhAnkHAT6ceFEE9sl5nQMz8FeAOumRss2v+RgANjjjZZo8SFtVElcutz6T6SfiPhkZ/anFoYSI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730996063; c=relaxed/simple; bh=H5EWsB5X8TMvpXemtCG/qOm20YK3S2tsf/Uf0SCDpPE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=IQxCccgHop5J258SECHwhSYXy26LSa5vBDdAQ8UxIcesAS4qSVmR2WmsxT2HnWUHQTYI32hBBb6bWe+cOApCdg6PA0OhuKvBCaw61vDFoKbXKLZLAbSsG7G320BKjFCfcqFFjSxpDKQJK7J14DE+fzqF5oPns6yZ6EdixomwIKQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=EtiF8NAS; arc=none smtp.client-ip=198.175.65.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="EtiF8NAS" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1730996062; x=1762532062; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=H5EWsB5X8TMvpXemtCG/qOm20YK3S2tsf/Uf0SCDpPE=; b=EtiF8NASZ10UrGqajTbTGakuSGA1XsI5QRTLzWqlu9kPHkVNYRQpSJ6w CF1cIlFWbHb1CwS2JnF0MT6XJQ6wPOIRRVq8DUr7cfLILwSOQW4ES4Um9 YWwDOXxeJFJfIHC3l3VZ7mCApraZYthayDo28pWxcWVGUumDD/oghAGSw xnQbV0OaDWrAFA73Ozt45toLLWMeJtBP57a9FWqVXHs1pJK6BuHwzrDAM ZGLZi6aTM11A0ByxXZA7FX3TfQoBCwVnbBoC7SGRAT1bHp1l1XT+kLdEh wd4SuYPvbLNVlPHwN+GpcP7OOydjpdtFedbuRcrfEZ3Iu4+UrPY0czeqw g==; X-CSE-ConnectionGUID: amH0BrHLS+uphJe6O6hQGQ== X-CSE-MsgGUID: bTJPkAV8TIWRFrTp9jBzbQ== X-IronPort-AV: E=McAfee;i="6700,10204,11222"; a="41955954" X-IronPort-AV: E=Sophos;i="6.11,199,1725346800"; d="scan'208";a="41955954" Received: from orviesa004.jf.intel.com ([10.64.159.144]) by orvoesa105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Nov 2024 08:14:20 -0800 X-CSE-ConnectionGUID: Z8HTsGHoTlmzkW1pt4MURg== X-CSE-MsgGUID: FWYHC3KFQXCt5WXHrKnSCQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,135,1728975600"; d="scan'208";a="90258213" Received: from newjersey.igk.intel.com ([10.102.20.203]) by orviesa004.jf.intel.com with ESMTP; 07 Nov 2024 08:14:17 -0800 From: Alexander Lobakin To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Alexander Lobakin , =?utf-8?q?Toke_H=C3=B8?= =?utf-8?q?iland-J=C3=B8rgensen?= , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Maciej Fijalkowski , Stanislav Fomichev , Magnus Karlsson , nex.sw.ncis.osdt.itp.upstreaming@intel.com, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next v4 09/19] page_pool: allow mixing PPs within one bulk Date: Thu, 7 Nov 2024 17:10:16 +0100 Message-ID: <20241107161026.2903044-10-aleksander.lobakin@intel.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241107161026.2903044-1-aleksander.lobakin@intel.com> References: <20241107161026.2903044-1-aleksander.lobakin@intel.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org The main reason for this change was to allow mixing pages from different &page_pools within one &xdp_buff/&xdp_frame. Why not? Adjust xdp_return_frame_bulk() and page_pool_put_page_bulk(), so that they won't be tied to a particular pool. Let the latter create a separate bulk of pages which's PP is different and process it after the main loop. This greatly optimizes xdp_return_frame_bulk(): no more hashtable lookups. Also make xdp_flush_frame_bulk() inline, as it's just one if + function call + one u32 read, not worth extending the call ladder. Co-developed-by: Toke Høiland-Jørgensen # iterative Signed-off-by: Toke Høiland-Jørgensen Signed-off-by: Alexander Lobakin --- include/net/page_pool/types.h | 6 ++-- include/net/xdp.h | 16 +++++++--- net/core/page_pool.c | 60 +++++++++++++++++++++++++++-------- net/core/xdp.c | 29 +---------------- 4 files changed, 62 insertions(+), 49 deletions(-) diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h index 6c1be99a5959..269ee1788388 100644 --- a/include/net/page_pool/types.h +++ b/include/net/page_pool/types.h @@ -259,8 +259,7 @@ void page_pool_disable_direct_recycling(struct page_pool *pool); void page_pool_destroy(struct page_pool *pool); void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *), const struct xdp_mem_info *mem); -void page_pool_put_page_bulk(struct page_pool *pool, struct page **data, - u32 count); +void page_pool_put_page_bulk(struct page **data, u32 count); #else static inline void page_pool_destroy(struct page_pool *pool) { @@ -272,8 +271,7 @@ static inline void page_pool_use_xdp_mem(struct page_pool *pool, { } -static inline void page_pool_put_page_bulk(struct page_pool *pool, - struct page **data, u32 count) +static inline void page_pool_put_page_bulk(struct page **data, u32 count) { } #endif diff --git a/include/net/xdp.h b/include/net/xdp.h index 4416cd4b5086..cce819ee17d3 100644 --- a/include/net/xdp.h +++ b/include/net/xdp.h @@ -11,6 +11,8 @@ #include #include /* skb_shared_info */ +#include + /** * DOC: XDP RX-queue information * @@ -193,14 +195,12 @@ xdp_frame_is_frag_pfmemalloc(const struct xdp_frame *frame) #define XDP_BULK_QUEUE_SIZE 16 struct xdp_frame_bulk { int count; - void *xa; struct page *q[XDP_BULK_QUEUE_SIZE]; }; static __always_inline void xdp_frame_bulk_init(struct xdp_frame_bulk *bq) { - /* bq->count will be zero'ed when bq->xa gets updated */ - bq->xa = NULL; + bq->count = 0; } static inline struct skb_shared_info * @@ -317,10 +317,18 @@ void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct, void xdp_return_frame(struct xdp_frame *xdpf); void xdp_return_frame_rx_napi(struct xdp_frame *xdpf); 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); +static inline void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq) +{ + if (unlikely(!bq->count)) + return; + + page_pool_put_page_bulk(bq->q, bq->count); + bq->count = 0; +} + static __always_inline unsigned int xdp_get_frame_len(const struct xdp_frame *xdpf) { diff --git a/net/core/page_pool.c b/net/core/page_pool.c index ad219206ee8d..2d67c2cc3d77 100644 --- a/net/core/page_pool.c +++ b/net/core/page_pool.c @@ -841,7 +841,6 @@ EXPORT_SYMBOL(page_pool_put_unrefed_page); /** * page_pool_put_page_bulk() - release references on multiple pages - * @pool: pool from which pages were allocated * @data: array holding page pointers * @count: number of pages in @data * @@ -854,35 +853,61 @@ EXPORT_SYMBOL(page_pool_put_unrefed_page); * Please note the caller must not use data area after running * page_pool_put_page_bulk(), as this function overwrites it. */ -void page_pool_put_page_bulk(struct page_pool *pool, struct page **data, - u32 count) +void page_pool_put_page_bulk(struct page **data, u32 count) { - int i, bulk_len = 0; + netmem_ref bulk[XDP_BULK_QUEUE_SIZE]; + int i, bulk_len, foreign; + struct page_pool *pool; + bool again = false; bool allow_direct; bool in_softirq; - allow_direct = page_pool_napi_local(pool); +again: + pool = NULL; + bulk_len = 0; + foreign = 0; for (i = 0; i < count; i++) { - netmem_ref netmem = page_to_netmem(compound_head(data[i])); + struct page *page; + netmem_ref netmem; + + if (!again) { + page = compound_head(data[i]); + netmem = page_to_netmem(page); - /* It is not the last user for the page frag case */ - if (!page_pool_is_last_ref(netmem)) + /* It is not the last user for the page frag case */ + if (!page_pool_is_last_ref(netmem)) + continue; + } else { + page = data[i]; + netmem = page_to_netmem(page); + } + + if (unlikely(!pool)) { + pool = page->pp; + allow_direct = page_pool_napi_local(pool); + } else if (page->pp != pool) { + /* + * If the page belongs to a different page_pool, save + * it for a second round after the main loop. + */ + data[foreign++] = page; continue; + } netmem = __page_pool_put_page(pool, netmem, -1, allow_direct); /* Approved for bulk recycling in ptr_ring cache */ if (netmem) - data[bulk_len++] = (__force void *)netmem; + bulk[bulk_len++] = netmem; } if (!bulk_len) - return; + goto out; /* Bulk producer into ptr_ring page_pool cache */ in_softirq = page_pool_producer_lock(pool); for (i = 0; i < bulk_len; i++) { - if (__ptr_ring_produce(&pool->ring, data[i])) { + if (__ptr_ring_produce(&pool->ring, (__force void *)bulk[i])) { /* ring full */ recycle_stat_inc(pool, ring_full); break; @@ -893,13 +918,22 @@ void page_pool_put_page_bulk(struct page_pool *pool, struct page **data, /* Hopefully all pages was return into ptr_ring */ if (likely(i == bulk_len)) - return; + goto out; /* ptr_ring cache full, free remaining pages outside producer lock * since put_page() with refcnt == 1 can be an expensive operation */ for (; i < bulk_len; i++) - page_pool_return_page(pool, (__force netmem_ref)data[i]); + page_pool_return_page(pool, bulk[i]); + +out: + if (!foreign) + return; + + count = foreign; + again = true; + + goto again; } EXPORT_SYMBOL(page_pool_put_page_bulk); diff --git a/net/core/xdp.c b/net/core/xdp.c index 779e646f347b..0fde1bb54192 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -508,46 +508,19 @@ EXPORT_SYMBOL_GPL(xdp_return_frame_rx_napi); * xdp_frame_bulk is usually stored/allocated on the function * call-stack to avoid locking penalties. */ -void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq) -{ - struct xdp_mem_allocator *xa = bq->xa; - - if (unlikely(!xa || !bq->count)) - return; - - page_pool_put_page_bulk(xa->page_pool, bq->q, bq->count); - /* bq->xa is not cleared to save lookup, if mem.id same in next bulk */ - bq->count = 0; -} -EXPORT_SYMBOL_GPL(xdp_flush_frame_bulk); /* Must be called with rcu_read_lock held */ void xdp_return_frame_bulk(struct xdp_frame *xdpf, struct xdp_frame_bulk *bq) { - struct xdp_mem_info *mem = &xdpf->mem; - struct xdp_mem_allocator *xa; - - if (mem->type != MEM_TYPE_PAGE_POOL) { + if (xdpf->mem.type != MEM_TYPE_PAGE_POOL) { xdp_return_frame(xdpf); return; } - xa = bq->xa; - if (unlikely(!xa)) { - xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params); - bq->count = 0; - bq->xa = xa; - } - if (bq->count == XDP_BULK_QUEUE_SIZE) xdp_flush_frame_bulk(bq); - if (unlikely(mem->id != xa->mem.id)) { - xdp_flush_frame_bulk(bq); - bq->xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params); - } - if (unlikely(xdp_frame_has_frags(xdpf))) { struct skb_shared_info *sinfo; int i;