From patchwork Wed Nov 23 10:06:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 13053398 X-Patchwork-Delegate: kuba@kernel.org 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C04C6C4332F for ; Wed, 23 Nov 2022 10:21:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237407AbiKWKVC (ORCPT ); Wed, 23 Nov 2022 05:21:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43938 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237065AbiKWKUA (ORCPT ); Wed, 23 Nov 2022 05:20:00 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 314DD12520D for ; Wed, 23 Nov 2022 02:06:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1669198018; 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=dnHFfz7r7prpFSiz+JpSCCTL+bVoik9Funx4d+jmueA=; b=IKyPsp54gSMrZhhDpIJ0M3rwC1IZIYMSbVf0DIBY74C+8ji+5qFAvMD5x2rb0I+AbQjvpy metYeIjcaUQvz96su5OsADlkqkAAVPC+UPAoKizOdyruU17E3mzsm5ja6hk+Ysdrw5EXLw 7jLPGoABFE+HYYySrb4l31rUWvHhgkw= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-410-1KSjg6-qO_S9IUr7uOwwLQ-1; Wed, 23 Nov 2022 05:06:49 -0500 X-MC-Unique: 1KSjg6-qO_S9IUr7uOwwLQ-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2FF72858F13; Wed, 23 Nov 2022 10:06:49 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.14]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8B84E492B07; Wed, 23 Nov 2022 10:06:48 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH net-next 03/13] rxrpc: Remove handling of duplicate packets in recvmsg_queue From: David Howells To: netdev@vger.kernel.org Cc: Marc Dionne , linux-afs@lists.infradead.org, dhowells@redhat.com, linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org Date: Wed, 23 Nov 2022 10:06:46 +0000 Message-ID: <166919800599.1256245.15876799628241612501.stgit@warthog.procyon.org.uk> In-Reply-To: <166919798040.1256245.11495568684139066955.stgit@warthog.procyon.org.uk> References: <166919798040.1256245.11495568684139066955.stgit@warthog.procyon.org.uk> User-Agent: StGit/1.5 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org We should not now see duplicate packets in the recvmsg_queue. At one point, jumbo packets that overlapped with already queued data would be added to the queue and dealt with in recvmsg rather than in the softirq input code, but now jumbo packets are split/cloned before being processed by the input code and the subpackets can be discarded individually. So remove the recvmsg-side code for handling this. Signed-off-by: David Howells cc: Marc Dionne cc: linux-afs@lists.infradead.org --- net/rxrpc/recvmsg.c | 18 ------------------ 1 file changed, 18 deletions(-) diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c index efb85f983657..134122f5961a 100644 --- a/net/rxrpc/recvmsg.c +++ b/net/rxrpc/recvmsg.c @@ -228,7 +228,6 @@ static void rxrpc_rotate_rx_window(struct rxrpc_call *call) _enter("%d", call->debug_id); -further_rotation: skb = skb_dequeue(&call->recvmsg_queue); rxrpc_see_skb(skb, rxrpc_skb_rotated); @@ -250,17 +249,6 @@ static void rxrpc_rotate_rx_window(struct rxrpc_call *call) return; } - /* The next packet on the queue might entirely overlap with the one we - * just consumed; if so, rotate that away also. - */ - skb = skb_peek(&call->recvmsg_queue); - if (skb) { - sp = rxrpc_skb(skb); - if (sp->hdr.seq != call->rx_consumed && - after_eq(call->rx_consumed, sp->hdr.seq)) - goto further_rotation; - } - /* Check to see if there's an ACK that needs sending. */ acked = atomic_add_return(call->rx_consumed - old_consumed, &call->ackr_nr_consumed); @@ -318,11 +306,6 @@ static int rxrpc_recvmsg_data(struct socket *sock, struct rxrpc_call *call, sp = rxrpc_skb(skb); seq = sp->hdr.seq; - if (after_eq(call->rx_consumed, seq)) { - kdebug("obsolete %x %x", call->rx_consumed, seq); - goto skip_obsolete; - } - if (!(flags & MSG_PEEK)) trace_rxrpc_receive(call, rxrpc_receive_front, sp->hdr.serial, seq); @@ -373,7 +356,6 @@ static int rxrpc_recvmsg_data(struct socket *sock, struct rxrpc_call *call, break; } - skip_obsolete: /* The whole packet has been transferred. */ if (sp->hdr.flags & RXRPC_LAST_PACKET) ret = 1;