From patchwork Tue Mar 25 15:45:42 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= X-Patchwork-Id: 14029164 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 83E2A2E3382 for ; Tue, 25 Mar 2025 15:46:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742917605; cv=none; b=fJYd6FBrE3o/WY5haQQmf6bOn0aJDWISRMdRwm2P4eLmFq5lmQESJk6EfIXCQg5PjOpDJKwSGgU9d6TyHwziz1JQyF2IOjWMEXQ0E5HQU7Q+utGcWsxgVcpu5+q36mpZNVgMTMPfWfTZO1/pZS0sNmx4UXlRfC7Miwapk4lOVpo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742917605; c=relaxed/simple; bh=4I05eVH/+uUp2ErZURt+83KwIztisW9+7S+LIhJyfXQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=IjnG/mUrWzXS2N3O5/jtSstOoYdAG77kpDmy/gc0yN8IPMPMP01TGHEfWwcTms//RQGlnpqRfJlmP/VFsofJc/FjeqdVzSESQNH9krX3TxIB3F0f474+P4xGpEyD0s2w9x5pAIVHUxylycU+HCmA5yvVQDXwcS0823WFiBAH81w= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=eM16o6nz; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="eM16o6nz" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1742917602; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=wHU3gd5R+PcFSPJyd+8lTgr7QvXzHN6SGWRXjaUKaHA=; b=eM16o6nzZz0/vjwgHZ+teEw9shTtdaMXE1Pduf5QmW3pOzpZpPlWPYymbcU+K7AS7eynRt 9c1QV1GDKyWX4KKn36ECtBrtMiZHfsv0hjk6TUsl1KWxXUIJ/cPvNx7VvOBONA/Xjvg7M5 JlgVzMW1kqB8SsuWb19kVK6KCj57YTY= Received: from mail-ej1-f69.google.com (mail-ej1-f69.google.com [209.85.218.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-363-9JRefGANPXuI8t82p6pSug-1; Tue, 25 Mar 2025 11:46:41 -0400 X-MC-Unique: 9JRefGANPXuI8t82p6pSug-1 X-Mimecast-MFC-AGG-ID: 9JRefGANPXuI8t82p6pSug_1742917600 Received: by mail-ej1-f69.google.com with SMTP id a640c23a62f3a-ac287f284f8so392151766b.0 for ; Tue, 25 Mar 2025 08:46:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1742917600; x=1743522400; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=wHU3gd5R+PcFSPJyd+8lTgr7QvXzHN6SGWRXjaUKaHA=; b=KViPOkHqzxLjw+RgIJYSKP+Lzr+bOxnnEzPyPlRNoTpvdNFkB/afAh+JDlUdwUALv0 k0a/+cxJRx+qs/5cAM6ey2NlsTeoaqIcYBn2pGW0YzlKCNXFGeOUKRLkVhnQDUJ2vJBN U3WuuNYDVJBw48iTwMmkE2R1dOI+BSFuvrbBVogtSCbyHsl/wgrMDAs6pYBvYqjrMYy+ jJ+f2MVNZzIuOMMmcRnFKH/Ew1p3DHl1V/4m2Tn4nbeLx6UvFiV7AZVsE7KC8aANtScy 2aGhCsUq6OCtxDWw2ImYdz/nXIcLb9sppsTlq+G7lZm5pQ2JRQ/IqytW6HGu4xKhhHXv LM1w== X-Forwarded-Encrypted: i=1; AJvYcCXxBS6RbujFfMO2v7D9KA5zAe6kuoY5vi1BY3Gu7T0N7O/OeLsYVp9cpc3usJrpMIPjJINSszBUERCV@vger.kernel.org X-Gm-Message-State: AOJu0YyE3q6btxlJ5K2lXZAdW/aVBd22QJKQYXRZLsMKpiia1Kbd2Xlx AvzPKE2EBC14l98A6UihMtZU8G0/9Isc/uLxKwUN2ZVEUDtj5mFP01oprxnBJGwFpGD9Mt2sYCu +EJtERFw0ZDPqODHqgK3LjG+buTOph8kvKIubW4e2Rf+b7qIN4LvNVEgfFCo= X-Gm-Gg: ASbGncviavuM/8dlJ1qkJB2WayMvErM6rMZlF4nxJMVTq6B73Hnv1T1X6ON4u/R+HG3 uzncGCRjWGEbjt3SCYm+zraVJzz86wUHsB11DdaS9vivwv68DiNhK8mRXQTrh2Gvt1s5Zvd65ji CQSa5mv3CDHmvuPchFNmcBnspTItE4w3OO5cFC81QUJYzgyXWcg2hgdPaDvuJ0uYpq7UUw6ZjmW 7vz0gId1zSUHPnz+t2eZxGFqzwHl+Gj3kHANbu1OXCJJGm2dUoMm1Z/nPukFH6SrF6vxunZU0p0 GrzOD+dAB3umHt8KDernmduM5opjx6xW+KuNizih X-Received: by 2002:a17:907:d786:b0:ac3:48e4:f8bb with SMTP id a640c23a62f3a-ac3f24adcd2mr2028797766b.41.1742917599850; Tue, 25 Mar 2025 08:46:39 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEHYnNtpCnvUp6kAetaPQVboemrGa0ubCCpu4/locWPfqZN0d+JRIaI57zV4LgX72gZ8HdAqQ== X-Received: by 2002:a17:907:d786:b0:ac3:48e4:f8bb with SMTP id a640c23a62f3a-ac3f24adcd2mr2028794266b.41.1742917599357; Tue, 25 Mar 2025 08:46:39 -0700 (PDT) Received: from alrua-x1.borgediget.toke.dk ([45.145.92.2]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ac3ef8e52c6sm863354366b.70.2025.03.25.08.46.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Mar 2025 08:46:38 -0700 (PDT) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id C703818FC8B8; Tue, 25 Mar 2025 16:46:36 +0100 (CET) From: =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= Date: Tue, 25 Mar 2025 16:45:42 +0100 Subject: [PATCH net-next v2 1/3] page_pool: Move pp_magic check into helper functions Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250325-page-pool-track-dma-v2-1-113ebc1946f3@redhat.com> References: <20250325-page-pool-track-dma-v2-0-113ebc1946f3@redhat.com> In-Reply-To: <20250325-page-pool-track-dma-v2-0-113ebc1946f3@redhat.com> To: "David S. Miller" , Jakub Kicinski , Jesper Dangaard Brouer , Saeed Mahameed , Leon Romanovsky , Tariq Toukan , Andrew Lunn , Eric Dumazet , Paolo Abeni , Ilias Apalodimas , Simon Horman , Andrew Morton , Mina Almasry , Yonglong Liu , Yunsheng Lin , Pavel Begunkov , Matthew Wilcox Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, linux-rdma@vger.kernel.org, linux-mm@kvack.org, =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= X-Mailer: b4 0.14.2 Since we are about to stash some more information into the pp_magic field, let's move the magic signature checks into a pair of helper functions so it can be changed in one place. Reviewed-by: Mina Almasry Tested-by: Yonglong Liu Signed-off-by: Toke Høiland-Jørgensen --- drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c | 4 ++-- include/net/page_pool/types.h | 18 ++++++++++++++++++ mm/page_alloc.c | 9 +++------ net/core/netmem_priv.h | 5 +++++ net/core/skbuff.c | 16 ++-------------- net/core/xdp.c | 4 ++-- 6 files changed, 32 insertions(+), 24 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c index 6f3094a479e1ec61854bb48a6a0c812167487173..70c6f0b2abb921778c98fbd428594ebd7986a302 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c @@ -706,8 +706,8 @@ static void mlx5e_free_xdpsq_desc(struct mlx5e_xdpsq *sq, xdpi = mlx5e_xdpi_fifo_pop(xdpi_fifo); page = xdpi.page.page; - /* No need to check ((page->pp_magic & ~0x3UL) == PP_SIGNATURE) - * as we know this is a page_pool page. + /* No need to check page_pool_page_is_pp() as we + * know this is a page_pool page. */ page_pool_recycle_direct(page->pp, page); } while (++n < num); diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h index 36eb57d73abc6cfc601e700ca08be20fb8281055..df0d3c1608929605224feb26173135ff37951ef8 100644 --- a/include/net/page_pool/types.h +++ b/include/net/page_pool/types.h @@ -54,6 +54,14 @@ struct pp_alloc_cache { netmem_ref cache[PP_ALLOC_CACHE_SIZE]; }; +/* Mask used for checking in page_pool_page_is_pp() below. page->pp_magic is + * OR'ed with PP_SIGNATURE after the allocation in order to preserve bit 0 for + * the head page of compound page and bit 1 for pfmemalloc page. + * page_is_pfmemalloc() is checked in __page_pool_put_page() to avoid recycling + * the pfmemalloc page. + */ +#define PP_MAGIC_MASK ~0x3UL + /** * struct page_pool_params - page pool parameters * @fast: params accessed frequently on hotpath @@ -264,6 +272,11 @@ 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_netmem_bulk(netmem_ref *data, u32 count); + +static inline bool page_pool_page_is_pp(struct page *page) +{ + return (page->pp_magic & PP_MAGIC_MASK) == PP_SIGNATURE; +} #else static inline void page_pool_destroy(struct page_pool *pool) { @@ -278,6 +291,11 @@ static inline void page_pool_use_xdp_mem(struct page_pool *pool, static inline void page_pool_put_netmem_bulk(netmem_ref *data, u32 count) { } + +static inline bool page_pool_page_is_pp(struct page *page) +{ + return false; +} #endif void page_pool_put_unrefed_netmem(struct page_pool *pool, netmem_ref netmem, diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 542d25f77be80304b731411ffd29b276ee13be0c..3535ee76afe946cbb042ecbce603bdbedc9233b9 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -55,6 +55,7 @@ #include #include #include +#include #include #include "internal.h" #include "shuffle.h" @@ -872,9 +873,7 @@ static inline bool page_expected_state(struct page *page, #ifdef CONFIG_MEMCG page->memcg_data | #endif -#ifdef CONFIG_PAGE_POOL - ((page->pp_magic & ~0x3UL) == PP_SIGNATURE) | -#endif + page_pool_page_is_pp(page) | (page->flags & check_flags))) return false; @@ -901,10 +900,8 @@ static const char *page_bad_reason(struct page *page, unsigned long flags) if (unlikely(page->memcg_data)) bad_reason = "page still charged to cgroup"; #endif -#ifdef CONFIG_PAGE_POOL - if (unlikely((page->pp_magic & ~0x3UL) == PP_SIGNATURE)) + if (unlikely(page_pool_page_is_pp(page))) bad_reason = "page_pool leak"; -#endif return bad_reason; } diff --git a/net/core/netmem_priv.h b/net/core/netmem_priv.h index 7eadb8393e002fd1cc2cef8a313d2ea7df76f301..f33162fd281c23e109273ba09950c5d0a2829bc9 100644 --- a/net/core/netmem_priv.h +++ b/net/core/netmem_priv.h @@ -18,6 +18,11 @@ static inline void netmem_clear_pp_magic(netmem_ref netmem) __netmem_clear_lsb(netmem)->pp_magic = 0; } +static inline bool netmem_is_pp(netmem_ref netmem) +{ + return (netmem_get_pp_magic(netmem) & PP_MAGIC_MASK) == PP_SIGNATURE; +} + static inline void netmem_set_pp(netmem_ref netmem, struct page_pool *pool) { __netmem_clear_lsb(netmem)->pp = pool; diff --git a/net/core/skbuff.c b/net/core/skbuff.c index ab8acb737b93299f503e5c298b87e18edd59d555..a64d777488e403d5fdef83ae42ae9e4924c1a0dc 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -893,11 +893,6 @@ static void skb_clone_fraglist(struct sk_buff *skb) skb_get(list); } -static bool is_pp_netmem(netmem_ref netmem) -{ - return (netmem_get_pp_magic(netmem) & ~0x3UL) == PP_SIGNATURE; -} - int skb_pp_cow_data(struct page_pool *pool, struct sk_buff **pskb, unsigned int headroom) { @@ -995,14 +990,7 @@ bool napi_pp_put_page(netmem_ref netmem) { netmem = netmem_compound_head(netmem); - /* page->pp_magic is OR'ed with PP_SIGNATURE after the allocation - * in order to preserve any existing bits, such as bit 0 for the - * head page of compound page and bit 1 for pfmemalloc page, so - * mask those bits for freeing side when doing below checking, - * and page_is_pfmemalloc() is checked in __page_pool_put_page() - * to avoid recycling the pfmemalloc page. - */ - if (unlikely(!is_pp_netmem(netmem))) + if (unlikely(!netmem_is_pp(netmem))) return false; page_pool_put_full_netmem(netmem_get_pp(netmem), netmem, false); @@ -1042,7 +1030,7 @@ static int skb_pp_frag_ref(struct sk_buff *skb) for (i = 0; i < shinfo->nr_frags; i++) { head_netmem = netmem_compound_head(shinfo->frags[i].netmem); - if (likely(is_pp_netmem(head_netmem))) + if (likely(netmem_is_pp(head_netmem))) page_pool_ref_netmem(head_netmem); else page_ref_inc(netmem_to_page(head_netmem)); diff --git a/net/core/xdp.c b/net/core/xdp.c index f86eedad586a77eb63a96a85aa6d068d3e94f077..0ba73943c6eed873b3d1c681b3b9a802b590f2d9 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -437,8 +437,8 @@ void __xdp_return(netmem_ref netmem, enum xdp_mem_type mem_type, netmem = netmem_compound_head(netmem); if (napi_direct && xdp_return_frame_no_direct()) napi_direct = false; - /* No need to check ((page->pp_magic & ~0x3UL) == PP_SIGNATURE) - * as mem->type knows this a page_pool page + /* No need to check netmem_is_pp() as mem->type knows this a + * page_pool page */ page_pool_put_full_netmem(netmem_get_pp(netmem), netmem, napi_direct);