From nobody Wed Nov 27 16:54:40 2024 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.17]) (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 82D0F1E5713; Wed, 9 Oct 2024 15:29:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.17 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728487753; cv=none; b=obXt2aM+ZFf3bAJfe6eCRct8KwCFxBXkvBzmSunZM6pkJw4ej+Ji8klxA1+XoTFyaEe28ynrKPYEsCN+4GhdlW13JCzSXc4atxvnlV6Q83xYzRnfWONLDjEHd7gByah+FGFNlIbqp0VqLRQhaokpxEUGgkSqeGbiz9gpfn3droM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728487753; c=relaxed/simple; bh=dKSd1kPDw+yeIAzbWu7UjF1bVJ2WCtTpGkqUxz/8jlI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iSUo0bKGJCpMIv+n77jZ6WIJiDjMTANWnzRH6frbGPJpyURBfeXcgBX/TEkKMlPuji7WJjyNE8QR1R3unZYfd+58dAKhFxjMryHq2yKegix+KKfOGEUyYJWL7srDHiq/6wwv6rqr6TOyHJrSjtKLMZL6hgGbpCv/3ov382hd+AY= 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=fvNj4M9z; arc=none smtp.client-ip=192.198.163.17 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="fvNj4M9z" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1728487751; x=1760023751; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=dKSd1kPDw+yeIAzbWu7UjF1bVJ2WCtTpGkqUxz/8jlI=; b=fvNj4M9zzZzgJ1ru4WHBpdRzWPjzV9XyDYDuXdaynYTdjFW3W/nZTrv4 Npch+OeD1LUVDIIUHnW/YNHARr4rq5ckKfCr8gXsNX8Z8kTQgdOTfotwh iBsJ+FYAdmS2a8D2xBLvqri+woXfk4wUQs6Y6h9FbsYMeZnc2ondGCyOe kwP+123CIN9YkoYO5f8zY9tU2RQFFxlle7eEJKCioPR+hT4qRQkTQDeJm qaHLrHfpuDvEQfdpPDfqhfV7+P/7x+SzLbhlW2/Hoa8v2m5Opu2hbVelj VfSpjN6qACikTrpVbg0eECn663YTblhQa/klj4RForYPC8AJnVIkdQvoi w==; X-CSE-ConnectionGUID: UkUWQvptTX+rFjsq+q17dQ== X-CSE-MsgGUID: Mi0yBwAAQvuyUmp8neC6/g== X-IronPort-AV: E=McAfee;i="6700,10204,11220"; a="27675782" X-IronPort-AV: E=Sophos;i="6.11,190,1725346800"; d="scan'208";a="27675782" Received: from orviesa004.jf.intel.com ([10.64.159.144]) by fmvoesa111.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Oct 2024 08:29:11 -0700 X-CSE-ConnectionGUID: +Zm6UkXyRFGO8j4Q0KLQaw== X-CSE-MsgGUID: q3AE64BTR0KLs8eDFNu98Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,190,1725346800"; d="scan'208";a="81305983" Received: from newjersey.igk.intel.com ([10.102.20.203]) by orviesa004.jf.intel.com with ESMTP; 09 Oct 2024 08:29:07 -0700 From: Alexander Lobakin To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Alexander Lobakin , =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , 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 09/18] page_pool: allow mixing PPs within one bulk Date: Wed, 9 Oct 2024 17:27:47 +0200 Message-ID: <20241009152756.3113697-10-aleksander.lobakin@intel.com> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241009152756.3113697-1-aleksander.lobakin@intel.com> References: <20241009152756.3113697-1-aleksander.lobakin@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 flush it recursively. 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. Signed-off-by: Alexander Lobakin --- include/net/page_pool/types.h | 7 +++-- include/net/xdp.h | 16 ++++++++--- net/core/page_pool.c | 50 ++++++++++++++++++++++++++++++----- net/core/xdp.c | 29 +------------------- 4 files changed, 59 insertions(+), 43 deletions(-) diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h index 6c1be99a5959..9a01ce864afa 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_poo= l *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, bool rec); #else static inline void page_pool_destroy(struct page_pool *pool) { @@ -272,8 +271,8 @@ static inline void page_pool_use_xdp_mem(struct page_po= ol *pool, { } =20 -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, + bool rec) { } #endif diff --git a/include/net/xdp.h b/include/net/xdp.h index f99fbe9bf5a5..38f27b8b9efd 100644 --- a/include/net/xdp.h +++ b/include/net/xdp.h @@ -11,6 +11,8 @@ #include #include /* skb_shared_info */ =20 +#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]; }; =20 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 =3D NULL; + bq->count =3D 0; } =20 static inline struct skb_shared_info * @@ -316,10 +316,18 @@ void __xdp_return(void *data, struct xdp_mem_info *me= m, 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); =20 +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, false); + bq->count =3D 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..22b44f86dfa0 100644 --- a/net/core/page_pool.c +++ b/net/core/page_pool.c @@ -839,11 +839,22 @@ void page_pool_put_unrefed_page(struct page_pool *poo= l, struct page *page, } EXPORT_SYMBOL(page_pool_put_unrefed_page); =20 +static void page_pool_bulk_rec_add(struct xdp_frame_bulk *bulk, + struct page *page) +{ + bulk->q[bulk->count++] =3D page; + + if (unlikely(bulk->count =3D=3D ARRAY_SIZE(bulk->q))) { + page_pool_put_page_bulk(bulk->q, ARRAY_SIZE(bulk->q), true); + bulk->count =3D 0; + } +} + /** * 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 + * @rec: whether it's called recursively by itself * * Tries to refill a number of pages into the ptr_ring cache holding ptr_r= ing * producer lock. If the ptr_ring is full, page_pool_put_page_bulk() @@ -854,21 +865,43 @@ 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, bool rec) { + struct page_pool *pool =3D NULL; + struct xdp_frame_bulk sub; int i, bulk_len =3D 0; bool allow_direct; bool in_softirq; =20 - allow_direct =3D page_pool_napi_local(pool); + xdp_frame_bulk_init(&sub); =20 for (i =3D 0; i < count; i++) { - netmem_ref netmem =3D page_to_netmem(compound_head(data[i])); + struct page *page; + netmem_ref netmem; + + if (!rec) { + page =3D compound_head(data[i]); + netmem =3D page_to_netmem(page); =20 - /* 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 =3D data[i]; + netmem =3D page_to_netmem(page); + } + + if (unlikely(!pool)) { + pool =3D page->pp; + allow_direct =3D page_pool_napi_local(pool); + } else if (page->pp !=3D pool) { + /* + * If the page belongs to a different page_pool, save + * it to handle recursively after the main loop. + */ + page_pool_bulk_rec_add(&sub, page); continue; + } =20 netmem =3D __page_pool_put_page(pool, netmem, -1, allow_direct); /* Approved for bulk recycling in ptr_ring cache */ @@ -876,6 +909,9 @@ void page_pool_put_page_bulk(struct page_pool *pool, st= ruct page **data, data[bulk_len++] =3D (__force void *)netmem; } =20 + if (sub.count) + page_pool_put_page_bulk(sub.q, sub.count, true); + if (!bulk_len) return; =20 diff --git a/net/core/xdp.c b/net/core/xdp.c index 4b2ff5a280bb..60a2d4122606 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 =3D 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 =3D 0; -} -EXPORT_SYMBOL_GPL(xdp_flush_frame_bulk); =20 /* 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 =3D &xdpf->mem; - struct xdp_mem_allocator *xa; - - if (mem->type !=3D MEM_TYPE_PAGE_POOL) { + if (xdpf->mem.type !=3D MEM_TYPE_PAGE_POOL) { xdp_return_frame(xdpf); return; } =20 - xa =3D bq->xa; - if (unlikely(!xa)) { - xa =3D rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params); - bq->count =3D 0; - bq->xa =3D xa; - } - if (bq->count =3D=3D XDP_BULK_QUEUE_SIZE) xdp_flush_frame_bulk(bq); =20 - if (unlikely(mem->id !=3D xa->mem.id)) { - xdp_flush_frame_bulk(bq); - bq->xa =3D 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; --=20 2.46.2