From patchwork Thu Nov 12 10:47:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Abeni X-Patchwork-Id: 1398824 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lists.01.org (client-ip=2001:19d0:306:5::1; helo=ml01.01.org; envelope-from=mptcp-bounces@lists.01.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=V+Bdek7V; dkim-atps=neutral Received: from ml01.01.org (ml01.01.org [IPv6:2001:19d0:306:5::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4CWyyW4VYrz9sRK for ; Thu, 12 Nov 2020 21:49:06 +1100 (AEDT) Received: from ml01.vlan13.01.org (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 617F5100EF27D; Thu, 12 Nov 2020 02:49:03 -0800 (PST) Received-SPF: Pass (mailfrom) identity=mailfrom; client-ip=63.128.21.124; helo=us-smtp-delivery-124.mimecast.com; envelope-from=pabeni@redhat.com; receiver= Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [63.128.21.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 40A4A100EF274 for ; Thu, 12 Nov 2020 02:49:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1605178140; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=/slgcmxs898KlGneKyZAERwtPDD5/j/VLmsu2rdJHPA=; b=V+Bdek7V3nMgzw1CpQYoVQLtwOEYudYLVM2PKwXMQmQvSja+B/NrreqeQif1Nq5O4GZFR2 j7uYfV4SQYyKVKTCASKT4XoexmM8KXGpHT241DBzxFibRFbRwz5zxqSvAuSeEr7VSO8mgM UJ/5sr6mSJtWvWsWv8t5vMzsvA81sUY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-444-b2pPmcIiPlCqTH1zCpJQLw-1; Thu, 12 Nov 2020 05:48:58 -0500 X-MC-Unique: b2pPmcIiPlCqTH1zCpJQLw-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 830A41084D89; Thu, 12 Nov 2020 10:48:57 +0000 (UTC) Received: from gerbillo.redhat.com (ovpn-112-208.ams2.redhat.com [10.36.112.208]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5B3245C3E1; Thu, 12 Nov 2020 10:48:56 +0000 (UTC) From: Paolo Abeni To: netdev@vger.kernel.org Date: Thu, 12 Nov 2020 11:47:59 +0100 Message-Id: <8fcb0ad6f324008ccadfd1811d91b3145bbf95fd.1605175834.git.pabeni@redhat.com> In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Message-ID-Hash: DI5QWHYTINHFZTI6OJVKJGYBNHLBVAFO X-Message-ID-Hash: DI5QWHYTINHFZTI6OJVKJGYBNHLBVAFO X-MailFrom: pabeni@redhat.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; suspicious-header CC: Eric Dumazet , mptcp@lists.01.org, Jakub Kicinski X-Mailman-Version: 3.1.1 Precedence: list Subject: [MPTCP] [PATCH net-next 01/13] tcp: factor out tcp_build_frag() List-Id: Discussions regarding MPTCP upstreaming Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: Will be needed by the next patch, as MPTCP needs to handle directly the error/memory-allocation-needed path. No functional changes intended. Additionally let MPTCP code access the tcp_remove_empty_skb() helper. Signed-off-by: Paolo Abeni --- include/net/tcp.h | 3 ++ net/ipv4/tcp.c | 119 ++++++++++++++++++++++++++-------------------- 2 files changed, 70 insertions(+), 52 deletions(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index 4aba0f069b05..374d0a2acc4b 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -322,6 +322,7 @@ void tcp_shutdown(struct sock *sk, int how); int tcp_v4_early_demux(struct sk_buff *skb); int tcp_v4_rcv(struct sk_buff *skb); +void tcp_remove_empty_skb(struct sock *sk, struct sk_buff *skb); int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw); int tcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size); int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size); @@ -329,6 +330,8 @@ int tcp_sendpage(struct sock *sk, struct page *page, int offset, size_t size, int flags); int tcp_sendpage_locked(struct sock *sk, struct page *page, int offset, size_t size, int flags); +struct sk_buff *tcp_build_frag(struct sock *sk, int size_goal, int flags, + struct page *page, int offset, size_t *size); ssize_t do_tcp_sendpages(struct sock *sk, struct page *page, int offset, size_t size, int flags); int tcp_send_mss(struct sock *sk, int *size_goal, int flags); diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index b2bc3d7fe9e8..391705aaa80e 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -954,7 +954,7 @@ int tcp_send_mss(struct sock *sk, int *size_goal, int flags) * importantly be able to generate EPOLLOUT for Edge Trigger epoll() * users. */ -static void tcp_remove_empty_skb(struct sock *sk, struct sk_buff *skb) +void tcp_remove_empty_skb(struct sock *sk, struct sk_buff *skb) { if (skb && !skb->len) { tcp_unlink_write_queue(skb, sk); @@ -964,6 +964,68 @@ static void tcp_remove_empty_skb(struct sock *sk, struct sk_buff *skb) } } +struct sk_buff *tcp_build_frag(struct sock *sk, int size_goal, int flags, + struct page *page, int offset, size_t *size) +{ + struct sk_buff *skb = tcp_write_queue_tail(sk); + struct tcp_sock *tp = tcp_sk(sk); + bool can_coalesce; + int copy, i; + + if (!skb || (copy = size_goal - skb->len) <= 0 || + !tcp_skb_can_collapse_to(skb)) { +new_segment: + if (!sk_stream_memory_free(sk)) + return NULL; + + skb = sk_stream_alloc_skb(sk, 0, sk->sk_allocation, + tcp_rtx_and_write_queues_empty(sk)); + if (!skb) + return NULL; + +#ifdef CONFIG_TLS_DEVICE + skb->decrypted = !!(flags & MSG_SENDPAGE_DECRYPTED); +#endif + skb_entail(sk, skb); + copy = size_goal; + } + + if (copy > *size) + copy = *size; + + i = skb_shinfo(skb)->nr_frags; + can_coalesce = skb_can_coalesce(skb, i, page, offset); + if (!can_coalesce && i >= sysctl_max_skb_frags) { + tcp_mark_push(tp, skb); + goto new_segment; + } + if (!sk_wmem_schedule(sk, copy)) + return NULL; + + if (can_coalesce) { + skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); + } else { + get_page(page); + skb_fill_page_desc(skb, i, page, offset, copy); + } + + if (!(flags & MSG_NO_SHARED_FRAGS)) + skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; + + skb->len += copy; + skb->data_len += copy; + skb->truesize += copy; + sk_wmem_queued_add(sk, copy); + sk_mem_charge(sk, copy); + skb->ip_summed = CHECKSUM_PARTIAL; + WRITE_ONCE(tp->write_seq, tp->write_seq + copy); + TCP_SKB_CB(skb)->end_seq += copy; + tcp_skb_pcount_set(skb, 0); + + *size = copy; + return skb; +} + ssize_t do_tcp_sendpages(struct sock *sk, struct page *page, int offset, size_t size, int flags) { @@ -999,60 +1061,13 @@ ssize_t do_tcp_sendpages(struct sock *sk, struct page *page, int offset, goto out_err; while (size > 0) { - struct sk_buff *skb = tcp_write_queue_tail(sk); - int copy, i; - bool can_coalesce; - - if (!skb || (copy = size_goal - skb->len) <= 0 || - !tcp_skb_can_collapse_to(skb)) { -new_segment: - if (!sk_stream_memory_free(sk)) - goto wait_for_space; - - skb = sk_stream_alloc_skb(sk, 0, sk->sk_allocation, - tcp_rtx_and_write_queues_empty(sk)); - if (!skb) - goto wait_for_space; - -#ifdef CONFIG_TLS_DEVICE - skb->decrypted = !!(flags & MSG_SENDPAGE_DECRYPTED); -#endif - skb_entail(sk, skb); - copy = size_goal; - } + struct sk_buff *skb; + size_t copy = size; - if (copy > size) - copy = size; - - i = skb_shinfo(skb)->nr_frags; - can_coalesce = skb_can_coalesce(skb, i, page, offset); - if (!can_coalesce && i >= sysctl_max_skb_frags) { - tcp_mark_push(tp, skb); - goto new_segment; - } - if (!sk_wmem_schedule(sk, copy)) + skb = tcp_build_frag(sk, size_goal, flags, page, offset, ©); + if (!skb) goto wait_for_space; - if (can_coalesce) { - skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); - } else { - get_page(page); - skb_fill_page_desc(skb, i, page, offset, copy); - } - - if (!(flags & MSG_NO_SHARED_FRAGS)) - skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; - - skb->len += copy; - skb->data_len += copy; - skb->truesize += copy; - sk_wmem_queued_add(sk, copy); - sk_mem_charge(sk, copy); - skb->ip_summed = CHECKSUM_PARTIAL; - WRITE_ONCE(tp->write_seq, tp->write_seq + copy); - TCP_SKB_CB(skb)->end_seq += copy; - tcp_skb_pcount_set(skb, 0); - if (!copied) TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_PSH;