From patchwork Mon Jan 21 11:17:22 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amos Kong X-Patchwork-Id: 2011201 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id D34833FED4 for ; Mon, 21 Jan 2013 11:17:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753146Ab3AULRn (ORCPT ); Mon, 21 Jan 2013 06:17:43 -0500 Received: from mx1.redhat.com ([209.132.183.28]:42092 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752981Ab3AULRm (ORCPT ); Mon, 21 Jan 2013 06:17:42 -0500 Received: from int-mx01.intmail.prod.int.phx2.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r0LBHbS8022455 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Mon, 21 Jan 2013 06:17:38 -0500 Received: from dhcp-8-167.nay.redhat.com ([10.66.4.143]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id r0LBHNWB006286; Mon, 21 Jan 2013 06:17:34 -0500 From: Amos Kong To: davem@davemloft.net, netdev@vger.kernel.org Cc: mst@redhat.com, rusty@rustcorp.com.au, qemu-devel@nongnu.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: [PATCH v5 2/3] net: split eth_mac_addr for better error handling Date: Mon, 21 Jan 2013 19:17:22 +0800 Message-Id: <1358767043-24548-3-git-send-email-akong@redhat.com> In-Reply-To: <1358767043-24548-1-git-send-email-akong@redhat.com> References: <1358767043-24548-1-git-send-email-akong@redhat.com> X-Scanned-By: MIMEDefang 2.67 on 10.5.11.11 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Stefan Hajnoczi When we set mac address, software mac address in system and hardware mac address all need to be updated. Current eth_mac_addr() doesn't allow callers to implement error handling nicely. This patch split eth_mac_addr() to prepare part and real commit part, then we can prepare first, and try to change hardware address, then do the real commit if hardware address is set successfully. Signed-off-by: Stefan Hajnoczi Signed-off-by: Amos Kong --- include/linux/etherdevice.h | 2 ++ net/ethernet/eth.c | 41 +++++++++++++++++++++++++++++++++++------ 2 files changed, 37 insertions(+), 6 deletions(-) diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h index 1a43e1b..c623861 100644 --- a/include/linux/etherdevice.h +++ b/include/linux/etherdevice.h @@ -40,6 +40,8 @@ extern int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, extern void eth_header_cache_update(struct hh_cache *hh, const struct net_device *dev, const unsigned char *haddr); +extern int eth_prepare_mac_addr_change(struct net_device *dev, void *p); +extern void eth_commit_mac_addr_change(struct net_device *dev, void *p); extern int eth_mac_addr(struct net_device *dev, void *p); extern int eth_change_mtu(struct net_device *dev, int new_mtu); extern int eth_validate_addr(struct net_device *dev); diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c index bc39c8c..a36c85e 100644 --- a/net/ethernet/eth.c +++ b/net/ethernet/eth.c @@ -272,6 +272,36 @@ void eth_header_cache_update(struct hh_cache *hh, EXPORT_SYMBOL(eth_header_cache_update); /** + * eth_prepare_mac_addr_change - prepare for mac change + * @dev: network device + * @p: socket address + */ +int eth_prepare_mac_addr_change(struct net_device *dev, void *p) +{ + struct sockaddr *addr = p; + + if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev)) + return -EBUSY; + if (!is_valid_ether_addr(addr->sa_data)) + return -EADDRNOTAVAIL; + return 0; +} +EXPORT_SYMBOL(eth_prepare_mac_addr_change); + +/** + * eth_commit_mac_addr_change - commit mac change + * @dev: network device + * @p: socket address + */ +void eth_commit_mac_addr_change(struct net_device *dev, void *p) +{ + struct sockaddr *addr = p; + + memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); +} +EXPORT_SYMBOL(eth_commit_mac_addr_change); + +/** * eth_mac_addr - set new Ethernet hardware address * @dev: network device * @p: socket address @@ -283,13 +313,12 @@ EXPORT_SYMBOL(eth_header_cache_update); */ int eth_mac_addr(struct net_device *dev, void *p) { - struct sockaddr *addr = p; + int ret; - if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev)) - return -EBUSY; - if (!is_valid_ether_addr(addr->sa_data)) - return -EADDRNOTAVAIL; - memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); + ret = eth_prepare_mac_addr_change(dev, p); + if (ret < 0) + return ret; + eth_commit_mac_addr_change(dev, p); return 0; } EXPORT_SYMBOL(eth_mac_addr);