From patchwork Fri Mar 13 15:52:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Abeni X-Patchwork-Id: 222547 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C709C5ACBF for ; Fri, 13 Mar 2020 15:53:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 738EF20724 for ; Fri, 13 Mar 2020 15:53:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Ga7k0eMg" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726986AbgCMPxM (ORCPT ); Fri, 13 Mar 2020 11:53:12 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:40621 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726442AbgCMPxL (ORCPT ); Fri, 13 Mar 2020 11:53:11 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1584114790; 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=prP8G06Z8lWjAnIztTLuEEPiR8PxmQUL5o3aVg67oxg=; b=Ga7k0eMgX+fLgkSm4mXBs/x3BRu+P2X2wHIXpgcqut9ULf0u897MbYEBaGhl3fG6k+mqFq IcyNJfOe9soz/RUM48dsnFo64JrPx4CXfMvU3XdnBNApCSGp6Mq9mDkh8G7o4sHCUW0tHn AzWLc+rMEi8Gc7Ao9JcjizY2R9J3nSM= 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-58-41a3_wwQOJa2ap-toJtaAA-1; Fri, 13 Mar 2020 11:53:07 -0400 X-MC-Unique: 41a3_wwQOJa2ap-toJtaAA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id DBC3313EA; Fri, 13 Mar 2020 15:53:05 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-116-114.ams2.redhat.com [10.36.116.114]) by smtp.corp.redhat.com (Postfix) with ESMTP id EAC4160C63; Fri, 13 Mar 2020 15:53:04 +0000 (UTC) From: Paolo Abeni To: netdev@vger.kernel.org Cc: "David S. Miller" , Mat Martineau Subject: [PATCH net-next v2 2/2] mptcp: drop unneeded checks Date: Fri, 13 Mar 2020 16:52:42 +0100 Message-Id: In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org After the previous patch subflow->conn is always != NULL and is never changed. We can drop a bunch of now unneeded checks. v1 -> v2: - rebased on top of commit 2398e3991bda ("mptcp: always include dack if possible.") Signed-off-by: Paolo Abeni --- net/mptcp/options.c | 14 ++------------ net/mptcp/subflow.c | 18 +++++++----------- 2 files changed, 9 insertions(+), 23 deletions(-) diff --git a/net/mptcp/options.c b/net/mptcp/options.c index 9c71f427e6e3..63c8ee49cef2 100644 --- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -336,7 +336,6 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb, unsigned int ack_size; bool ret = false; bool can_ack; - u64 ack_seq; u8 tcp_fin; if (skb) { @@ -368,16 +367,7 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb, can_ack = true; opts->ext_copy.use_ack = 0; msk = mptcp_sk(subflow->conn); - if (likely(msk && READ_ONCE(msk->can_ack))) { - ack_seq = msk->ack_seq; - } else if (subflow->can_ack) { - mptcp_crypto_key_sha(subflow->remote_key, NULL, &ack_seq); - ack_seq++; - } else { - can_ack = false; - } - - if (unlikely(!can_ack)) { + if (!READ_ONCE(msk->can_ack)) { *size = ALIGN(dss_size, 4); return ret; } @@ -390,7 +380,7 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb, dss_size += ack_size; - opts->ext_copy.data_ack = ack_seq; + opts->ext_copy.data_ack = msk->ack_seq; opts->ext_copy.ack64 = 1; opts->ext_copy.use_ack = 1; diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c index 047b088e4617..8434c7f5f712 100644 --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -112,7 +112,7 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb) subflow->icsk_af_ops->sk_rx_dst_set(sk, skb); - if (subflow->conn && !subflow->conn_finished) { + if (!subflow->conn_finished) { pr_debug("subflow=%p, remote_key=%llu", mptcp_subflow_ctx(sk), subflow->remote_key); mptcp_finish_connect(sk); @@ -439,9 +439,6 @@ static bool subflow_check_data_avail(struct sock *ssk) if (subflow->data_avail) return true; - if (!subflow->conn) - return false; - msk = mptcp_sk(subflow->conn); for (;;) { u32 map_remaining; @@ -561,11 +558,10 @@ static void subflow_data_ready(struct sock *sk) struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); struct sock *parent = subflow->conn; - if (!parent || !subflow->mp_capable) { + if (!subflow->mp_capable) { subflow->tcp_data_ready(sk); - if (parent) - parent->sk_data_ready(parent); + parent->sk_data_ready(parent); return; } @@ -579,7 +575,7 @@ static void subflow_write_space(struct sock *sk) struct sock *parent = subflow->conn; sk_stream_write_space(sk); - if (parent && sk_stream_is_writeable(sk)) { + if (sk_stream_is_writeable(sk)) { set_bit(MPTCP_SEND_SPACE, &mptcp_sk(parent)->flags); smp_mb__after_atomic(); /* set SEND_SPACE before sk_stream_write_space clears NOSPACE */ @@ -694,7 +690,7 @@ static bool subflow_is_done(const struct sock *sk) static void subflow_state_change(struct sock *sk) { struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); - struct sock *parent = READ_ONCE(subflow->conn); + struct sock *parent = subflow->conn; __subflow_state_change(sk); @@ -702,10 +698,10 @@ static void subflow_state_change(struct sock *sk) * a fin packet carrying a DSS can be unnoticed if we don't trigger * the data available machinery here. */ - if (parent && subflow->mp_capable && mptcp_subflow_data_available(sk)) + if (subflow->mp_capable && mptcp_subflow_data_available(sk)) mptcp_data_ready(parent, sk); - if (parent && !(parent->sk_shutdown & RCV_SHUTDOWN) && + if (!(parent->sk_shutdown & RCV_SHUTDOWN) && !subflow->rx_eof && subflow_is_done(sk)) { subflow->rx_eof = 1; parent->sk_shutdown |= RCV_SHUTDOWN;