From patchwork Tue Mar 26 22:50:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13605305 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9FE6813DDCB for ; Tue, 26 Mar 2024 22:51:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711493482; cv=none; b=KuZL656+xh3CTsmUKeZYILCQ4SeXea+sRaOppDbPixzF4JHVoIwFkXtfgMMjyxZaDxIpUGLk2d666eQZxvLMJWravRUvsGLDkbogONt8to0uEhd5rknxkhh+MhUw/cm3PYqFocEfflf///sM1HHjTJR8Bwl1+a3W93hUs6x/JTA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711493482; c=relaxed/simple; bh=MFtFD7QvgVI9yOUwmuW/Gat4cRYyJqW0KYyD43iFUVQ=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=pUvlX9h/Jn1SqKtOUDfhE0oeKOzo7UjFXQrxQp+118q3ocU+SMTvyWBZAu25JKYy6NTW30JCGEmejEkiZeq6SMDZ4A9y2X4Y7dowbNizkNO/k3yt0KQbGYCj9LdGpOR/00aoA6J9k6mDYSfFumYjx1h/+QQLC/GgG4GlcqPICs8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--almasrymina.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=pqdmVMWt; arc=none smtp.client-ip=209.85.128.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--almasrymina.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="pqdmVMWt" Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-60cd62fa20fso121029667b3.3 for ; Tue, 26 Mar 2024 15:51:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1711493475; x=1712098275; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=CZzmmX233kO6dJHGiFcs8o01xSEeeqyqo5FiT9OgEo8=; b=pqdmVMWtXGqNjr4+1vcrUbtuGkxeFJIA1d0QrFfhCSoS1LW/Gsj7FRM3kUa87oiBPI AIyazPfQylWTpox0TpALZ7euR7pLs04u0WF4PS90aNVuVDWXtNVfkZ1yUU5hjv1coee6 IhjF7roaPuv6gWPfe9PPFIpxUMDZPdZ0/QChHr4yv1a/dv+raZj/5eB4O60laUKL3TDY qoHuQiwyOLG2ILMZP2JUf748ziJBN8LKm4apheW0jLRIUv3w9BrWXuA/ZwdQcSuf92h4 Vcfvsm1yZGz0U1AWjhH1gctpDc3ZBt9uDXLsSQsNGLY8RKybF7okKnGsHGBXQRMXWzyf w+Ig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1711493475; x=1712098275; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=CZzmmX233kO6dJHGiFcs8o01xSEeeqyqo5FiT9OgEo8=; b=Cgz/rZSGLgjS/hxwiXYGKXqpo7ZUptRRy+9iYZs1bFRuR8IKn9juS42IxRaLqHY/Mo uiMIjnERHQi97KJK3dNCQJ/uw97FTPxWC47FZTyLf465FwD3Jxuz/TYN118nvZKehbV7 hMlvRWIw1pnLzsGyWZhz5DqGVQxEt3UjfatVTc405fCXocn055jM6LpwxBwHrqSgynaB F+Ln5dDRppVDLV4weh49E627szKN9nUZ/GpOKq8/5+oM2Om37xSqs8Es11jfo+If86Tr M5PZmYnms03+ne3CcEFT+Rf/5QL8gqpitbFlHgDQGvMTsczcq0Obydnc0rCP0a6456Ct b5xg== X-Forwarded-Encrypted: i=1; AJvYcCXhACIi6P3m+h7RTCKBSXb8GGY43ttsRkSarb8GNN62f22+v6RIktpgCFj8MqSLjB2tCV3tHzYrGh0/ksOhGCtrjYqZEqIlbChNqK14QqX1tZFK X-Gm-Message-State: AOJu0Yzt86k5TaHfGKvmEBIAMMSwqerH0xfuWPbDQzhhZ6J18CW7Gfki iCI6sqMGplnAteXk74McJXEu+L6DYRWNuCnBCxyfyRbF5852Xddk+Kv7LJyf/bVG0hXvgf60CuM l14UVm3Em6OxWSHhvESiJgA== X-Google-Smtp-Source: AGHT+IEdweUGIR8RlliYPxgmCB5NPj7h583EZe+Yg+FD0SYphKZA41Usogavdhs3vjHXEwXSKCTDdpaqjb4oBXVhgQ== X-Received: from almasrymina.svl.corp.google.com ([2620:15c:2c4:200:c51e:bdd0:7cc8:695c]) (user=almasrymina job=sendgmr) by 2002:a05:690c:b9e:b0:611:28f9:aa21 with SMTP id ck30-20020a05690c0b9e00b0061128f9aa21mr2572176ywb.4.1711493474784; Tue, 26 Mar 2024 15:51:14 -0700 (PDT) Date: Tue, 26 Mar 2024 15:50:40 -0700 In-Reply-To: <20240326225048.785801-1-almasrymina@google.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240326225048.785801-1-almasrymina@google.com> X-Mailer: git-send-email 2.44.0.396.g6e790dbe36-goog Message-ID: <20240326225048.785801-10-almasrymina@google.com> Subject: [RFC PATCH net-next v7 09/14] net: support non paged skb frags From: Mina Almasry To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-arch@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Cc: Mina Almasry , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Jonathan Corbet , Richard Henderson , Ivan Kokshaysky , Matt Turner , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Andreas Larsson , Jesper Dangaard Brouer , Ilias Apalodimas , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Arnd Bergmann , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Steffen Klassert , Herbert Xu , David Ahern , Willem de Bruijn , Shuah Khan , Sumit Semwal , " =?utf-8?q?Christian_K=C3=B6nig?= " , Pavel Begunkov , David Wei , Jason Gunthorpe , Yunsheng Lin , Shailend Chand , Harshitha Ramamurthy , Shakeel Butt , Jeroen de Borst , Praveen Kaligineedi Make skb_frag_page() fail in the case where the frag is not backed by a page, and fix its relevant callers to handle this case. Signed-off-by: Mina Almasry --- v6: - Rebased on top of the merged netmem changes. Changes in v1: - Fix illegal_highdma() (Yunsheng). - Rework napi_pp_put_page() slightly to reduce code churn (Willem). --- include/linux/skbuff.h | 53 +++++++++++++++++++++++++++++++++++------- net/core/dev.c | 3 ++- net/core/gro.c | 3 ++- net/core/skbuff.c | 11 +++++++++ net/ipv4/esp4.c | 2 +- net/ipv4/tcp.c | 3 +++ net/ipv6/esp6.c | 2 +- 7 files changed, 65 insertions(+), 12 deletions(-) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 78659c8efa4e..8143aee8d911 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -3483,17 +3483,53 @@ static inline void skb_frag_off_copy(skb_frag_t *fragto, fragto->offset = fragfrom->offset; } +/* Returns true if the skb_frag contains a net_iov. */ +static inline bool skb_frag_is_net_iov(const skb_frag_t *frag) +{ + return netmem_is_net_iov(frag->netmem); +} + +/** + * skb_frag_net_iov - retrieve the net_iov referred to by fragment + * @frag: the fragment + * + * Returns the &struct net_iov associated with @frag. Returns NULL if this + * frag has no associated net_iov. + */ +static inline struct net_iov *skb_frag_net_iov(const skb_frag_t *frag) +{ + if (!skb_frag_is_net_iov(frag)) + return NULL; + + return netmem_to_net_iov(frag->netmem); +} + /** * skb_frag_page - retrieve the page referred to by a paged fragment * @frag: the paged fragment * - * Returns the &struct page associated with @frag. + * Returns the &struct page associated with @frag. Returns NULL if this frag + * has no associated page. */ static inline struct page *skb_frag_page(const skb_frag_t *frag) { + if (skb_frag_is_net_iov(frag)) + return NULL; + return netmem_to_page(frag->netmem); } +/** + * skb_frag_netmem - retrieve the netmem referred to by a fragment + * @frag: the fragment + * + * Returns the &netmem_ref associated with @frag. + */ +static inline netmem_ref skb_frag_netmem(const skb_frag_t *frag) +{ + return frag->netmem; +} + /** * __skb_frag_ref - take an addition reference on a paged fragment. * @frag: the paged fragment @@ -3524,25 +3560,23 @@ int skb_cow_data_for_xdp(struct page_pool *pool, struct sk_buff **pskb, bool napi_pp_put_page(netmem_ref netmem, bool napi_safe); static inline void -skb_page_unref(const struct sk_buff *skb, struct page *page, bool napi_safe) +skb_page_unref(const struct sk_buff *skb, netmem_ref netmem, bool napi_safe) { #ifdef CONFIG_PAGE_POOL - if (skb->pp_recycle && napi_pp_put_page(page, napi_safe)) + if (skb->pp_recycle && napi_pp_put_page(netmem, napi_safe)) return; #endif - put_page(page); + put_page(netmem_to_page(netmem)); } static inline void napi_frag_unref(skb_frag_t *frag, bool recycle, bool napi_safe) { - struct page *page = skb_frag_page(frag); - #ifdef CONFIG_PAGE_POOL - if (recycle && napi_pp_put_page(page_to_netmem(page), napi_safe)) + if (recycle && napi_pp_put_page(skb_frag_netmem(frag), napi_safe)) return; #endif - put_page(page); + put_page(skb_frag_page(frag)); } /** @@ -3582,6 +3616,9 @@ static inline void skb_frag_unref(struct sk_buff *skb, int f) */ static inline void *skb_frag_address(const skb_frag_t *frag) { + if (!skb_frag_page(frag)) + return NULL; + return page_address(skb_frag_page(frag)) + skb_frag_off(frag); } diff --git a/net/core/dev.c b/net/core/dev.c index e10610698a0a..8228432cb600 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -3411,8 +3411,9 @@ static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) if (!(dev->features & NETIF_F_HIGHDMA)) { for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; + struct page *page = skb_frag_page(frag); - if (PageHighMem(skb_frag_page(frag))) + if (page && PageHighMem(page)) return 1; } } diff --git a/net/core/gro.c b/net/core/gro.c index ee30d4f0c038..eef20c82c5c3 100644 --- a/net/core/gro.c +++ b/net/core/gro.c @@ -380,7 +380,8 @@ static inline void skb_gro_reset_offset(struct sk_buff *skb, u32 nhoff) pinfo = skb_shinfo(skb); frag0 = &pinfo->frags[0]; - if (pinfo->nr_frags && !PageHighMem(skb_frag_page(frag0)) && + if (pinfo->nr_frags && skb_frag_page(frag0) && + !PageHighMem(skb_frag_page(frag0)) && (!NET_IP_ALIGN || !((skb_frag_off(frag0) + nhoff) & 3))) { NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0); NAPI_GRO_CB(skb)->frag0_len = min_t(unsigned int, diff --git a/net/core/skbuff.c b/net/core/skbuff.c index b7e974f0ae51..b4ea842ac9c7 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -1375,6 +1375,14 @@ void skb_dump(const char *level, const struct sk_buff *skb, bool full_pkt) struct page *p; u8 *vaddr; + if (skb_frag_is_net_iov(frag)) { + printk("%sskb frag %d: not readable\n", level, i); + len -= frag->bv_len; + if (!len) + break; + continue; + } + skb_frag_foreach_page(frag, skb_frag_off(frag), skb_frag_size(frag), p, p_off, p_len, copied) { @@ -3142,6 +3150,9 @@ static bool __skb_splice_bits(struct sk_buff *skb, struct pipe_inode_info *pipe, for (seg = 0; seg < skb_shinfo(skb)->nr_frags; seg++) { const skb_frag_t *f = &skb_shinfo(skb)->frags[seg]; + if (WARN_ON_ONCE(!skb_frag_page(f))) + return false; + if (__splice_segment(skb_frag_page(f), skb_frag_off(f), skb_frag_size(f), offset, len, spd, false, sk, pipe)) diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c index d33d12421814..3b2a6a033efa 100644 --- a/net/ipv4/esp4.c +++ b/net/ipv4/esp4.c @@ -114,7 +114,7 @@ static void esp_ssg_unref(struct xfrm_state *x, void *tmp, struct sk_buff *skb) */ if (req->src != req->dst) for (sg = sg_next(req->src); sg; sg = sg_next(sg)) - skb_page_unref(skb, sg_page(sg), false); + skb_page_unref(skb, page_to_netmem(sg_page(sg)), false); } #ifdef CONFIG_INET_ESPINTCP diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index d20b62d52171..9f6497c53d61 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2167,6 +2167,9 @@ static int tcp_zerocopy_receive(struct sock *sk, break; } page = skb_frag_page(frags); + if (WARN_ON_ONCE(!page)) + break; + prefetchw(page); pages[pages_to_map++] = page; length += PAGE_SIZE; diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c index 7371886d4f9f..342c07f0c6c4 100644 --- a/net/ipv6/esp6.c +++ b/net/ipv6/esp6.c @@ -131,7 +131,7 @@ static void esp_ssg_unref(struct xfrm_state *x, void *tmp, struct sk_buff *skb) */ if (req->src != req->dst) for (sg = sg_next(req->src); sg; sg = sg_next(sg)) - skb_page_unref(skb, sg_page(sg), false); + skb_page_unref(skb, page_to_netmem(sg_page(sg)), false); } #ifdef CONFIG_INET6_ESPINTCP