From mboxrd@z Thu Jan 1 00:00:00 1970 From: anuradhak@cumulusnetworks.com Subject: [PATCH net-next v6 1/4] net core: Add protodown support. Date: Tue, 14 Jul 2015 08:32:06 -0700 Message-ID: <1436887930-3067-2-git-send-email-anuradhak@cumulusnetworks.com> Cc: netdev@vger.kernel.org, roopa@cumulusnetworks.com, gospo@cumulusnetworks.com, wkok@cumulusnetworks.com, anuradhak@cumulusnetworks.com To: davem@davemloft.net, sfeldma@gmail.com Return-path: Received: from mail-pa0-f51.google.com ([209.85.220.51]:35210 "EHLO mail-pa0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752162AbbGNPcS (ORCPT ); Tue, 14 Jul 2015 11:32:18 -0400 Received: by pactm7 with SMTP id tm7so7464461pac.2 for ; Tue, 14 Jul 2015 08:32:18 -0700 (PDT) Sender: netdev-owner@vger.kernel.org List-ID: From: Anuradha Karuppiah This patch introduces the proto_down flag that can be used by user space applications to notify switch drivers that errors have been detected on the device. The switch driver can react to protodown notification by doing a phys down on the associated switch port. Signed-off-by: Anuradha Karuppiah Signed-off-by: Andy Gospodarek Signed-off-by: Roopa Prabhu Signed-off-by: Wilson Kok --- include/linux/netdevice.h | 14 ++++++++++++++ net/core/dev.c | 20 ++++++++++++++++++++ net/core/net-sysfs.c | 14 ++++++++++++++ 3 files changed, 48 insertions(+) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index e20979d..45cfd79 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1041,6 +1041,12 @@ typedef u16 (*select_queue_fallback_t)(struct net_device *dev, * TX queue. * int (*ndo_get_iflink)(const struct net_device *dev); * Called to get the iflink value of this device. + * void (*ndo_change_proto_down)(struct net_device *dev, + * bool proto_down); + * This function is used to pass protocol port error state information + * to the switch driver. The switch driver can react to the proto_down + * by doing a phys down on the associated switch port. + * */ struct net_device_ops { int (*ndo_init)(struct net_device *dev); @@ -1211,6 +1217,8 @@ struct net_device_ops { int queue_index, u32 maxrate); int (*ndo_get_iflink)(const struct net_device *dev); + int (*ndo_change_proto_down)(struct net_device *dev, + bool proto_down); }; /** @@ -1502,6 +1510,10 @@ enum netdev_priv_flags { * * @qdisc_tx_busylock: XXX: need comments on this one * + * @proto_down: protocol port state information can be sent to the + * switch driver and used to set the phys state of the + * switch port. + * * FIXME: cleanup struct net_device such that network protocol info * moves out. */ @@ -1762,6 +1774,7 @@ struct net_device { #endif struct phy_device *phydev; struct lock_class_key *qdisc_tx_busylock; + bool proto_down; }; #define to_net_dev(d) container_of(d, struct net_device, dev) @@ -2982,6 +2995,7 @@ int dev_get_phys_port_id(struct net_device *dev, struct netdev_phys_item_id *ppid); int dev_get_phys_port_name(struct net_device *dev, char *name, size_t len); +int dev_change_proto_down(struct net_device *dev, bool proto_down); struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev); struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, struct netdev_queue *txq, int *ret); diff --git a/net/core/dev.c b/net/core/dev.c index 6778a99..dcf8763 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -6076,6 +6076,26 @@ int dev_get_phys_port_name(struct net_device *dev, EXPORT_SYMBOL(dev_get_phys_port_name); /** + * dev_change_proto_down - update protocol port state information + * @dev: device + * @proto_down: new value + * + * This info can be used by switch drivers to set the phys state of the + * port. + */ +int dev_change_proto_down(struct net_device *dev, bool proto_down) +{ + const struct net_device_ops *ops = dev->netdev_ops; + + if (!ops->ndo_change_proto_down) + return -EOPNOTSUPP; + if (!netif_device_present(dev)) + return -ENODEV; + return ops->ndo_change_proto_down(dev, proto_down); +} +EXPORT_SYMBOL(dev_change_proto_down); + +/** * dev_new_index - allocate an ifindex * @net: the applicable net namespace * diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index 18b34d7..194c1d0 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -404,6 +404,19 @@ static ssize_t group_store(struct device *dev, struct device_attribute *attr, NETDEVICE_SHOW(group, fmt_dec); static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store); +static int change_proto_down(struct net_device *dev, unsigned long proto_down) +{ + return dev_change_proto_down(dev, (bool) proto_down); +} + +static ssize_t proto_down_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + return netdev_store(dev, attr, buf, len, change_proto_down); +} +NETDEVICE_SHOW_RW(proto_down, fmt_dec); + static ssize_t phys_port_id_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -501,6 +514,7 @@ static struct attribute *net_class_attrs[] = { &dev_attr_phys_port_id.attr, &dev_attr_phys_port_name.attr, &dev_attr_phys_switch_id.attr, + &dev_attr_proto_down.attr, NULL, }; ATTRIBUTE_GROUPS(net_class); -- 1.7.10.4