From patchwork Fri May 10 23:21:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13662057 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DEE79C25B75 for ; Fri, 10 May 2024 23:21:58 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D862110E4E4; Fri, 10 May 2024 23:21:57 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.b="TrZixUKX"; dkim-atps=neutral Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3AB9C10E4D0 for ; Fri, 10 May 2024 23:21:52 +0000 (UTC) Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-61be3f082b0so41611497b3.1 for ; Fri, 10 May 2024 16:21:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1715383311; x=1715988111; darn=lists.freedesktop.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=3FY3QHzrdAW09tWueu/aMMES3p9Trxyc8IXrEfxwbZs=; b=TrZixUKXRor78ayarC3+NEptfE9NOXRg6qb0Z5xeZaP7Qy3DSU+IhBNOeD7SpCsfjC /PSbtc4S/XMl9wxMJjQnbBFGrZ5MOVR1Bqk0sy8GHlo13L8w3phvUYW+RMcVcOEj96BJ 6Z4Py7fPSA1jr+TH4beu9CeX9geS6ftuGVRCIqqOxhI4gtYs1AcE2Il6FD06gl9HGClH EEntnwKUZIE4nzPsw6+/NLTzw4l6+GHEuuaF4BaW8liVtYEcG9kXKy4N4QkVUMoSdbwq pARnXtgcroNNPpoL4D4BEg9r5u/HOIK1P8CukkHrT/UflNc9vAzzoePBIptYKj/IqY7V vviQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1715383311; x=1715988111; 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=3FY3QHzrdAW09tWueu/aMMES3p9Trxyc8IXrEfxwbZs=; b=Y6HPXP9i0xlsViysr6CPqXn/+ygDJyB+ajjJjZT9QQsJWgOFh3ydgdgU80j11C2Y1R M5cnaFL3Ba/KPHtCwdqhkHrfdnSwdeTC0vs9h596lc/BuxidxV8UD1TKCvQ9x1rmeO++ b4MAZojVpjZioNoMVFaaCnaD+5hNHDih4k4WGPKkvttj55DyBdUrZxut0Q67GZn+TGGR rJsXa9k1P678ER1h6ojKBDfUniWvhZDRdlAGSIfHulUWSVJgehzOOfngdtOD+pSnTrzV gQnRx1IkznkO9qCdCAfD0TnCT+WSSBBXWXbx/lMdAIEodW8dYfI7wOUAR+ukIspm3tHI BE3w== X-Forwarded-Encrypted: i=1; AJvYcCU90ODzMf2OwLpRw0RAmFpw0tarWdOfFQ2rgeuNx0xZWomwwOUKJ4uaXv1oDaHwXlVefnvizwPvwTBiOzkNdaqouf+2Yzmzk9pSYshmvjnD X-Gm-Message-State: AOJu0Ywi7SuUkjK6yDOcSCjTtpco++pj11ShjFoB/319LMT38zIgYucv xXOFeTCICXuTDhDiiCC4gFWNeZVKd+R2CXfmHTwMsRnFZXvUgVv/9yaVMxAyrC+N0vktgwtG/Mx jHTb9w8xiAgDznJ73x7aImQ== X-Google-Smtp-Source: AGHT+IFZMp0DGKEafMa3Ahm5Z9844uE7chVN6kTpJ6SyutHQMlhk8uS0G9Cz9LuMIQ4TNk1hEStkZ5HXpGe4gEYSFw== X-Received: from almasrymina.svl.corp.google.com ([2620:15c:2c4:200:3428:1b4e:e75a:d31b]) (user=almasrymina job=sendgmr) by 2002:a05:690c:b9d:b0:61b:ec24:a014 with SMTP id 00721157ae682-622afd6d351mr9807037b3.0.1715383311305; Fri, 10 May 2024 16:21:51 -0700 (PDT) Date: Fri, 10 May 2024 16:21:20 -0700 In-Reply-To: <20240510232128.1105145-1-almasrymina@google.com> Mime-Version: 1.0 References: <20240510232128.1105145-1-almasrymina@google.com> X-Mailer: git-send-email 2.45.0.118.g7fe29c98d7-goog Message-ID: <20240510232128.1105145-10-almasrymina@google.com> Subject: [PATCH net-next v9 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 , Donald Hunter , Jakub Kicinski , "David S. Miller" , Eric Dumazet , 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 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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 | 42 +++++++++++++++++++++++++++++++++++++- include/linux/skbuff_ref.h | 9 ++++---- net/core/dev.c | 3 ++- net/core/gro.c | 3 ++- net/core/skbuff.c | 11 ++++++++++ net/ipv4/esp4.c | 3 ++- net/ipv4/tcp.c | 3 +++ net/ipv6/esp6.c | 3 ++- 8 files changed, 67 insertions(+), 10 deletions(-) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index c0b97c93a6de0..0dcf1c5824415 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -3490,21 +3490,58 @@ 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; +} + int skb_pp_cow_data(struct page_pool *pool, struct sk_buff **pskb, unsigned int headroom); int skb_cow_data_for_xdp(struct page_pool *pool, struct sk_buff **pskb, struct bpf_prog *prog); + /** * skb_frag_address - gets the address of the data contained in a paged fragment * @frag: the paged fragment buffer @@ -3514,6 +3551,9 @@ int skb_cow_data_for_xdp(struct page_pool *pool, struct sk_buff **pskb, */ 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/include/linux/skbuff_ref.h b/include/linux/skbuff_ref.h index 16c241a234728..0f3c58007488a 100644 --- a/include/linux/skbuff_ref.h +++ b/include/linux/skbuff_ref.h @@ -34,14 +34,13 @@ static inline void skb_frag_ref(struct sk_buff *skb, int f) bool napi_pp_put_page(netmem_ref netmem); -static inline void -skb_page_unref(struct page *page, bool recycle) +static inline void skb_page_unref(netmem_ref netmem, bool recycle) { #ifdef CONFIG_PAGE_POOL - if (recycle && napi_pp_put_page(page_to_netmem(page))) + if (recycle && napi_pp_put_page(netmem)) return; #endif - put_page(page); + put_page(netmem_to_page(netmem)); } /** @@ -54,7 +53,7 @@ skb_page_unref(struct page *page, bool recycle) */ static inline void __skb_frag_unref(skb_frag_t *frag, bool recycle) { - skb_page_unref(skb_frag_page(frag), recycle); + skb_page_unref(skb_frag_netmem(frag), recycle); } /** diff --git a/net/core/dev.c b/net/core/dev.c index b879da266c1f3..704c434d8d60c 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -3433,8 +3433,9 @@ 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 e2f84947fb743..10fb2145bcb2b 100644 --- a/net/core/gro.c +++ b/net/core/gro.c @@ -410,7 +410,8 @@ 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 2e49a6ea21af3..99cf1ee73836d 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -1352,6 +1352,14 @@ 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 -= skb_frag_size(frag); + 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 3968d3f98e083..4ce0bc41e7806 100644 --- a/net/ipv4/esp4.c +++ b/net/ipv4/esp4.c @@ -115,7 +115,8 @@ 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(sg_page(sg), skb->pp_recycle); + skb_page_unref(page_to_netmem(sg_page(sg)), + skb->pp_recycle); } #ifdef CONFIG_INET_ESPINTCP diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 06aab937d60a6..7e7f32f95c684 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2171,6 +2171,9 @@ 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 34a9a5b9ed00b..0318aea0d4ce6 100644 --- a/net/ipv6/esp6.c +++ b/net/ipv6/esp6.c @@ -132,7 +132,8 @@ 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(sg_page(sg), skb->pp_recycle); + skb_page_unref(page_to_netmem(sg_page(sg)), + skb->pp_recycle); } #ifdef CONFIG_INET6_ESPINTCP