From patchwork Wed Apr 20 15:09:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?SsO8cmdlbiBHcm/Dnw==?= X-Patchwork-Id: 12820430 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 C59E4C433FE for ; Wed, 20 Apr 2022 15:10:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1380043AbiDTPNT (ORCPT ); Wed, 20 Apr 2022 11:13:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43348 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1380096AbiDTPMs (ORCPT ); Wed, 20 Apr 2022 11:12:48 -0400 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 759EB13DE6; Wed, 20 Apr 2022 08:10:02 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id F1572215FE; Wed, 20 Apr 2022 15:10:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1650467400; h=from:from:reply-to: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=aZCkP4ZTIz8L3n5icXJW44l5GxuZEDRnsAjAP0WhQbc=; b=ltchNwiSpdyVnlwL94VdMGg3q9XkNrTd8PU8GecHmmKA2xueh8TSnLik9ju2nQgFdU7jAI fouQD9Ufzdt2SX7rghRnRK21cspyfWJSePo4SMHeff6MNuZopRUi8C1YLrbQaWkDstD8fp lKCwbxP0tpg7NCPGqZst22fehTkYZ20= Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id B560113AD5; Wed, 20 Apr 2022 15:10:00 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id kMInK0giYGJILQAAMHmgww (envelope-from ); Wed, 20 Apr 2022 15:10:00 +0000 From: Juergen Gross To: xen-devel@lists.xenproject.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Juergen Gross , Boris Ostrovsky , Stefano Stabellini , "David S. Miller" , Jakub Kicinski , Paolo Abeni Subject: [PATCH 11/18] xen/netfront: use xenbus_setup_ring() and xenbus_teardown_ring() Date: Wed, 20 Apr 2022 17:09:35 +0200 Message-Id: <20220420150942.31235-12-jgross@suse.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220420150942.31235-1-jgross@suse.com> References: <20220420150942.31235-1-jgross@suse.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Simplify netfront's ring creation and removal via xenbus_setup_ring() and xenbus_teardown_ring(). Signed-off-by: Juergen Gross --- drivers/net/xen-netfront.c | 49 +++++++++----------------------------- 1 file changed, 11 insertions(+), 38 deletions(-) diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c index af3d3de7d9fa..880b10d435d9 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -1921,8 +1921,7 @@ static int setup_netfront(struct xenbus_device *dev, struct netfront_queue *queue, unsigned int feature_split_evtchn) { struct xen_netif_tx_sring *txs; - struct xen_netif_rx_sring *rxs = NULL; - grant_ref_t gref; + struct xen_netif_rx_sring *rxs; int err; queue->tx_ring_ref = INVALID_GRANT_REF; @@ -1930,34 +1929,22 @@ static int setup_netfront(struct xenbus_device *dev, queue->rx.sring = NULL; queue->tx.sring = NULL; - txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); - if (!txs) { - err = -ENOMEM; - xenbus_dev_fatal(dev, err, "allocating tx ring page"); + err = xenbus_setup_ring(dev, GFP_NOIO | __GFP_HIGH, (void **)&txs, + 1, &queue->tx_ring_ref); + if (err) goto fail; - } + SHARED_RING_INIT(txs); FRONT_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE); - err = xenbus_grant_ring(dev, txs, 1, &gref); - if (err < 0) + err = xenbus_setup_ring(dev, GFP_NOIO | __GFP_HIGH, (void **)&rxs, + 1, &queue->rx_ring_ref); + if (err) goto fail; - queue->tx_ring_ref = gref; - rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); - if (!rxs) { - err = -ENOMEM; - xenbus_dev_fatal(dev, err, "allocating rx ring page"); - goto fail; - } SHARED_RING_INIT(rxs); FRONT_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE); - err = xenbus_grant_ring(dev, rxs, 1, &gref); - if (err < 0) - goto fail; - queue->rx_ring_ref = gref; - if (feature_split_evtchn) err = setup_netfront_split(queue); /* setup single event channel if @@ -1972,24 +1959,10 @@ static int setup_netfront(struct xenbus_device *dev, return 0; - /* If we fail to setup netfront, it is safe to just revoke access to - * granted pages because backend is not accessing it at this point. - */ fail: - if (queue->rx_ring_ref != INVALID_GRANT_REF) { - gnttab_end_foreign_access(queue->rx_ring_ref, - (unsigned long)rxs); - queue->rx_ring_ref = INVALID_GRANT_REF; - } else { - free_page((unsigned long)rxs); - } - if (queue->tx_ring_ref != INVALID_GRANT_REF) { - gnttab_end_foreign_access(queue->tx_ring_ref, - (unsigned long)txs); - queue->tx_ring_ref = INVALID_GRANT_REF; - } else { - free_page((unsigned long)txs); - } + xenbus_teardown_ring((void **)&queue->rx.sring, 1, &queue->rx_ring_ref); + xenbus_teardown_ring((void **)&queue->tx.sring, 1, &queue->tx_ring_ref); + return err; }