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480 lines
11 KiB
480 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* ldmvsw.c: Sun4v LDOM Virtual Switch Driver. |
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* |
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* Copyright (C) 2016-2017 Oracle. All rights reserved. |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/delay.h> |
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#include <linux/etherdevice.h> |
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#include <linux/ethtool.h> |
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#include <linux/highmem.h> |
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#include <linux/if_vlan.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/netdevice.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#if defined(CONFIG_IPV6) |
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#include <linux/icmpv6.h> |
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#endif |
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#include <net/ip.h> |
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#include <net/icmp.h> |
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#include <net/route.h> |
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#include <asm/vio.h> |
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#include <asm/ldc.h> |
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/* This driver makes use of the common code in sunvnet_common.c */ |
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#include "sunvnet_common.h" |
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/* Length of time before we decide the hardware is hung, |
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* and dev->tx_timeout() should be called to fix the problem. |
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*/ |
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#define VSW_TX_TIMEOUT (10 * HZ) |
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/* Static HW Addr used for the network interfaces representing vsw ports */ |
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static u8 vsw_port_hwaddr[ETH_ALEN] = {0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; |
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#define DRV_MODULE_NAME "ldmvsw" |
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#define DRV_MODULE_VERSION "1.2" |
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#define DRV_MODULE_RELDATE "March 4, 2017" |
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static char version[] = |
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DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")"; |
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MODULE_AUTHOR("Oracle"); |
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MODULE_DESCRIPTION("Sun4v LDOM Virtual Switch Driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_VERSION(DRV_MODULE_VERSION); |
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/* Ordered from largest major to lowest */ |
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static struct vio_version vsw_versions[] = { |
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{ .major = 1, .minor = 8 }, |
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{ .major = 1, .minor = 7 }, |
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{ .major = 1, .minor = 6 }, |
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{ .major = 1, .minor = 0 }, |
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}; |
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static void vsw_get_drvinfo(struct net_device *dev, |
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struct ethtool_drvinfo *info) |
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{ |
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strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver)); |
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strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version)); |
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} |
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static u32 vsw_get_msglevel(struct net_device *dev) |
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{ |
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struct vnet_port *port = netdev_priv(dev); |
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return port->vp->msg_enable; |
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} |
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static void vsw_set_msglevel(struct net_device *dev, u32 value) |
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{ |
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struct vnet_port *port = netdev_priv(dev); |
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port->vp->msg_enable = value; |
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} |
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static const struct ethtool_ops vsw_ethtool_ops = { |
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.get_drvinfo = vsw_get_drvinfo, |
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.get_msglevel = vsw_get_msglevel, |
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.set_msglevel = vsw_set_msglevel, |
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.get_link = ethtool_op_get_link, |
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}; |
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static LIST_HEAD(vnet_list); |
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static DEFINE_MUTEX(vnet_list_mutex); |
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/* func arg to vnet_start_xmit_common() to get the proper tx port */ |
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static struct vnet_port *vsw_tx_port_find(struct sk_buff *skb, |
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struct net_device *dev) |
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{ |
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struct vnet_port *port = netdev_priv(dev); |
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return port; |
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} |
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static u16 vsw_select_queue(struct net_device *dev, struct sk_buff *skb, |
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struct net_device *sb_dev) |
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{ |
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struct vnet_port *port = netdev_priv(dev); |
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if (!port) |
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return 0; |
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return port->q_index; |
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} |
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/* Wrappers to common functions */ |
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static netdev_tx_t vsw_start_xmit(struct sk_buff *skb, struct net_device *dev) |
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{ |
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return sunvnet_start_xmit_common(skb, dev, vsw_tx_port_find); |
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} |
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static void vsw_set_rx_mode(struct net_device *dev) |
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{ |
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struct vnet_port *port = netdev_priv(dev); |
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return sunvnet_set_rx_mode_common(dev, port->vp); |
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} |
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int ldmvsw_open(struct net_device *dev) |
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{ |
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struct vnet_port *port = netdev_priv(dev); |
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struct vio_driver_state *vio = &port->vio; |
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/* reset the channel */ |
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vio_link_state_change(vio, LDC_EVENT_RESET); |
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vnet_port_reset(port); |
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vio_port_up(vio); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(ldmvsw_open); |
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#ifdef CONFIG_NET_POLL_CONTROLLER |
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static void vsw_poll_controller(struct net_device *dev) |
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{ |
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struct vnet_port *port = netdev_priv(dev); |
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return sunvnet_poll_controller_common(dev, port->vp); |
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} |
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#endif |
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static const struct net_device_ops vsw_ops = { |
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.ndo_open = ldmvsw_open, |
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.ndo_stop = sunvnet_close_common, |
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.ndo_set_rx_mode = vsw_set_rx_mode, |
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.ndo_set_mac_address = sunvnet_set_mac_addr_common, |
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.ndo_validate_addr = eth_validate_addr, |
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.ndo_tx_timeout = sunvnet_tx_timeout_common, |
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.ndo_start_xmit = vsw_start_xmit, |
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.ndo_select_queue = vsw_select_queue, |
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#ifdef CONFIG_NET_POLL_CONTROLLER |
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.ndo_poll_controller = vsw_poll_controller, |
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#endif |
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}; |
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static const char *local_mac_prop = "local-mac-address"; |
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static const char *cfg_handle_prop = "cfg-handle"; |
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static struct vnet *vsw_get_vnet(struct mdesc_handle *hp, |
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u64 port_node, |
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u64 *handle) |
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{ |
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struct vnet *vp; |
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struct vnet *iter; |
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const u64 *local_mac = NULL; |
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const u64 *cfghandle = NULL; |
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u64 a; |
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/* Get the parent virtual-network-switch macaddr and cfghandle */ |
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mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) { |
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u64 target = mdesc_arc_target(hp, a); |
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const char *name; |
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name = mdesc_get_property(hp, target, "name", NULL); |
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if (!name || strcmp(name, "virtual-network-switch")) |
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continue; |
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local_mac = mdesc_get_property(hp, target, |
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local_mac_prop, NULL); |
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cfghandle = mdesc_get_property(hp, target, |
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cfg_handle_prop, NULL); |
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break; |
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} |
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if (!local_mac || !cfghandle) |
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return ERR_PTR(-ENODEV); |
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/* find or create associated vnet */ |
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vp = NULL; |
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mutex_lock(&vnet_list_mutex); |
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list_for_each_entry(iter, &vnet_list, list) { |
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if (iter->local_mac == *local_mac) { |
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vp = iter; |
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break; |
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} |
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} |
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if (!vp) { |
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vp = kzalloc(sizeof(*vp), GFP_KERNEL); |
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if (unlikely(!vp)) { |
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mutex_unlock(&vnet_list_mutex); |
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return ERR_PTR(-ENOMEM); |
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} |
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spin_lock_init(&vp->lock); |
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INIT_LIST_HEAD(&vp->port_list); |
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INIT_LIST_HEAD(&vp->list); |
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vp->local_mac = *local_mac; |
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list_add(&vp->list, &vnet_list); |
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} |
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mutex_unlock(&vnet_list_mutex); |
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*handle = (u64)*cfghandle; |
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return vp; |
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} |
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static struct net_device *vsw_alloc_netdev(u8 hwaddr[], |
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struct vio_dev *vdev, |
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u64 handle, |
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u64 port_id) |
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{ |
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struct net_device *dev; |
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struct vnet_port *port; |
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int i; |
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dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1); |
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if (!dev) |
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return ERR_PTR(-ENOMEM); |
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dev->needed_headroom = VNET_PACKET_SKIP + 8; |
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dev->needed_tailroom = 8; |
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for (i = 0; i < ETH_ALEN; i++) { |
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dev->dev_addr[i] = hwaddr[i]; |
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dev->perm_addr[i] = dev->dev_addr[i]; |
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} |
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sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id); |
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dev->netdev_ops = &vsw_ops; |
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dev->ethtool_ops = &vsw_ethtool_ops; |
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dev->watchdog_timeo = VSW_TX_TIMEOUT; |
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dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG; |
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dev->features = dev->hw_features; |
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/* MTU range: 68 - 65535 */ |
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dev->min_mtu = ETH_MIN_MTU; |
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dev->max_mtu = VNET_MAX_MTU; |
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SET_NETDEV_DEV(dev, &vdev->dev); |
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return dev; |
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} |
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static struct ldc_channel_config vsw_ldc_cfg = { |
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.event = sunvnet_event_common, |
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.mtu = 64, |
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.mode = LDC_MODE_UNRELIABLE, |
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}; |
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static struct vio_driver_ops vsw_vio_ops = { |
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.send_attr = sunvnet_send_attr_common, |
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.handle_attr = sunvnet_handle_attr_common, |
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.handshake_complete = sunvnet_handshake_complete_common, |
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}; |
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static const char *remote_macaddr_prop = "remote-mac-address"; |
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static const char *id_prop = "id"; |
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static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) |
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{ |
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struct mdesc_handle *hp; |
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struct vnet_port *port; |
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unsigned long flags; |
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struct vnet *vp; |
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struct net_device *dev; |
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const u64 *rmac; |
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int len, i, err; |
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const u64 *port_id; |
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u64 handle; |
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hp = mdesc_grab(); |
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rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); |
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err = -ENODEV; |
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if (!rmac) { |
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pr_err("Port lacks %s property\n", remote_macaddr_prop); |
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mdesc_release(hp); |
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return err; |
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} |
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port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL); |
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err = -ENODEV; |
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if (!port_id) { |
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pr_err("Port lacks %s property\n", id_prop); |
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mdesc_release(hp); |
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return err; |
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} |
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/* Get (or create) the vnet associated with this port */ |
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vp = vsw_get_vnet(hp, vdev->mp, &handle); |
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if (IS_ERR(vp)) { |
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err = PTR_ERR(vp); |
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pr_err("Failed to get vnet for vsw-port\n"); |
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mdesc_release(hp); |
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return err; |
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} |
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mdesc_release(hp); |
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dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id); |
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if (IS_ERR(dev)) { |
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err = PTR_ERR(dev); |
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pr_err("Failed to alloc netdev for vsw-port\n"); |
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return err; |
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} |
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port = netdev_priv(dev); |
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INIT_LIST_HEAD(&port->list); |
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for (i = 0; i < ETH_ALEN; i++) |
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port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; |
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port->vp = vp; |
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port->dev = dev; |
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port->switch_port = 1; |
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port->tso = false; /* no tso in vsw, misbehaves in bridge */ |
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port->tsolen = 0; |
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/* Mark the port as belonging to ldmvsw which directs the |
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* the common code to use the net_device in the vnet_port |
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* rather than the net_device in the vnet (which is used |
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* by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE |
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* macro. |
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*/ |
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port->vsw = 1; |
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err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, |
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vsw_versions, ARRAY_SIZE(vsw_versions), |
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&vsw_vio_ops, dev->name); |
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if (err) |
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goto err_out_free_dev; |
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err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port); |
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if (err) |
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goto err_out_free_dev; |
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dev_set_drvdata(&vdev->dev, port); |
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netif_napi_add(dev, &port->napi, sunvnet_poll_common, |
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NAPI_POLL_WEIGHT); |
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spin_lock_irqsave(&vp->lock, flags); |
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list_add_rcu(&port->list, &vp->port_list); |
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spin_unlock_irqrestore(&vp->lock, flags); |
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timer_setup(&port->clean_timer, sunvnet_clean_timer_expire_common, 0); |
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err = register_netdev(dev); |
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if (err) { |
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pr_err("Cannot register net device, aborting\n"); |
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goto err_out_del_timer; |
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} |
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spin_lock_irqsave(&vp->lock, flags); |
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sunvnet_port_add_txq_common(port); |
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spin_unlock_irqrestore(&vp->lock, flags); |
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napi_enable(&port->napi); |
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vio_port_up(&port->vio); |
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/* assure no carrier until we receive an LDC_EVENT_UP, |
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* even if the vsw config script tries to force us up |
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*/ |
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netif_carrier_off(dev); |
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netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr); |
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pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name, |
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port->raddr, " switch-port"); |
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return 0; |
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err_out_del_timer: |
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del_timer_sync(&port->clean_timer); |
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list_del_rcu(&port->list); |
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synchronize_rcu(); |
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netif_napi_del(&port->napi); |
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dev_set_drvdata(&vdev->dev, NULL); |
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vio_ldc_free(&port->vio); |
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err_out_free_dev: |
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free_netdev(dev); |
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return err; |
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} |
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static void vsw_port_remove(struct vio_dev *vdev) |
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{ |
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struct vnet_port *port = dev_get_drvdata(&vdev->dev); |
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unsigned long flags; |
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if (port) { |
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del_timer_sync(&port->vio.timer); |
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del_timer_sync(&port->clean_timer); |
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napi_disable(&port->napi); |
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unregister_netdev(port->dev); |
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list_del_rcu(&port->list); |
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synchronize_rcu(); |
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spin_lock_irqsave(&port->vp->lock, flags); |
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sunvnet_port_rm_txq_common(port); |
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spin_unlock_irqrestore(&port->vp->lock, flags); |
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netif_napi_del(&port->napi); |
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sunvnet_port_free_tx_bufs_common(port); |
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vio_ldc_free(&port->vio); |
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dev_set_drvdata(&vdev->dev, NULL); |
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free_netdev(port->dev); |
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} |
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} |
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static void vsw_cleanup(void) |
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{ |
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struct vnet *vp; |
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/* just need to free up the vnet list */ |
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mutex_lock(&vnet_list_mutex); |
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while (!list_empty(&vnet_list)) { |
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vp = list_first_entry(&vnet_list, struct vnet, list); |
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list_del(&vp->list); |
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/* vio_unregister_driver() should have cleaned up port_list */ |
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if (!list_empty(&vp->port_list)) |
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pr_err("Ports not removed by VIO subsystem!\n"); |
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kfree(vp); |
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} |
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mutex_unlock(&vnet_list_mutex); |
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} |
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static const struct vio_device_id vsw_port_match[] = { |
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{ |
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.type = "vsw-port", |
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}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(vio, vsw_port_match); |
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static struct vio_driver vsw_port_driver = { |
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.id_table = vsw_port_match, |
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.probe = vsw_port_probe, |
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.remove = vsw_port_remove, |
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.name = "vsw_port", |
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}; |
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static int __init vsw_init(void) |
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{ |
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pr_info("%s\n", version); |
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return vio_register_driver(&vsw_port_driver); |
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} |
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static void __exit vsw_exit(void) |
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{ |
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vio_unregister_driver(&vsw_port_driver); |
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vsw_cleanup(); |
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} |
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module_init(vsw_init); |
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module_exit(vsw_exit);
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