ldmvsw: Add ldmvsw.c driver code

  Add ldmvsw.c driver

  Details:

  The ldmvsw driver very closely follows the sunvnet.c code and makes
  use of the sunvnet_common.c code for core functionality.

  A significant difference between sunvnet and ldmvsw driver is
  sunvnet creates a network interface for each vnet-port *parent*
  node in the MD while the ldmvsw driver creates a network interface
  for every vsw-port node in the Machine Description (MD).
  Therefore the netdev_priv() for sunvnet is a vnet structure while
  the netdev_priv() for ldmvsw is a vnet_port structure.

  Vnet_port structures allocated by ldmvsw have the vsw bit set.
  When finding the net_device associated with a port, the common code keys
  off this bit to use either the net_device found in the vnet_port or the
  net_device in the vnet structure (see the VNET_PORT_TO_NET_DEVICE() macro in
  sunvnet_common.h). This scheme allows the common code to work with
  both drivers with minimal changes.

  Similar to Xen, network interfaces created by the ldmvsw driver will always
  have a HW Addr (i.e. mac address) of FE:FF:FF:FF:FF:FF and each will be
  assigned the devname "vif<cfg_handle>.<port_id>" - where <cfg_handle> and
  <port_id> are a unique handle/port pair assigned to the associated
  vsw-port node in the MD.

  Signed-off-by: Aaron Young <aaron.young@oracle.com>
  Signed-off-by: Rashmi Narasimhan <rashmi.narasimhan@oracle.com>
  Reviewed-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
  Reviewed-by: Alexandre Chartre <Alexandre.Chartre@oracle.com>

Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 481 insertions, 0 deletions

diff --git a/arch/sparc/configs/sparc64_defconfig b/arch/sparc/configs/sparc64_defconfig
index 6b68f12f29db..04920ab8e292 100644
--- a/arch/sparc/configs/sparc64_defconfig
+++ b/arch/sparc/configs/sparc64_defconfig
@@ -102,6 +102,7 @@ CONFIG_SUNLANCE=m
 CONFIG_HAPPYMEAL=m
 CONFIG_SUNGEM=m
 CONFIG_SUNVNET=m
+CONFIG_LDMVSW=m
 CONFIG_NET_PCI=y
 CONFIG_E1000=m
 CONFIG_E1000E=m
diff --git a/drivers/net/ethernet/sun/Kconfig b/drivers/net/ethernet/sun/Kconfig
index aa58c11ea6db..a4b40e3015e5 100644
--- a/drivers/net/ethernet/sun/Kconfig
+++ b/drivers/net/ethernet/sun/Kconfig
@@ -80,6 +80,17 @@ config SUNVNET
         ---help---
           Support for virtual network devices under Sun Logical Domains.
 
+config LDMVSW
+        tristate "Sun4v LDoms Virtual Switch support"
+        depends on SUN_LDOMS
+        ---help---
+          Support for virtual switch devices under Sun4v Logical Domains.
+          This driver adds a network interface for every vsw-port node
+          found in the machine description of a service domain.
+          Linux bridge/switch software can use these interfaces for
+          guest domain network interconnectivity or guest domain
+          connection to a physical network on a service domain.
+
 config NIU
         tristate "Sun Neptune 10Gbit Ethernet support"
         depends on PCI
diff --git a/drivers/net/ethernet/sun/Makefile b/drivers/net/ethernet/sun/Makefile
index 7b622aa14c5b..37855438b3cb 100644
--- a/drivers/net/ethernet/sun/Makefile
+++ b/drivers/net/ethernet/sun/Makefile
@@ -9,4 +9,5 @@ obj-$(CONFIG_SUNGEM) += sungem.o
 obj-$(CONFIG_CASSINI) += cassini.o
 obj-$(CONFIG_SUNVNET_COMMON) += sunvnet_common.o
 obj-$(CONFIG_SUNVNET) += sunvnet.o
+obj-$(CONFIG_LDMVSW) += ldmvsw.o
 obj-$(CONFIG_NIU) += niu.o
diff --git a/drivers/net/ethernet/sun/ldmvsw.c b/drivers/net/ethernet/sun/ldmvsw.c
new file mode 100644
index 000000000000..e15bf84fc6b2
--- /dev/null
+++ b/drivers/net/ethernet/sun/ldmvsw.c
@@ -0,0 +1,468 @@
+/* ldmvsw.c: Sun4v LDOM Virtual Switch Driver.
+ *
+ * Copyright (C) 2016 Oracle. All rights reserved.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/delay.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/highmem.h>
+#include <linux/if_vlan.h>
+#include <linux/init.h>
+#include <linux/kconfig.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/netdevice.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#if defined(CONFIG_IPV6)
+#include <linux/icmpv6.h>
+#endif
+
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/route.h>
+
+#include <asm/vio.h>
+#include <asm/ldc.h>
+
+/* This driver makes use of the common code in sunvnet_common.c */
+#include "sunvnet_common.h"
+
+/* Length of time before we decide the hardware is hung,
+ * and dev->tx_timeout() should be called to fix the problem.
+ */
+#define VSW_TX_TIMEOUT                  (10 * HZ)
+
+/* Static HW Addr used for the network interfaces representing vsw ports */
+static u8 vsw_port_hwaddr[ETH_ALEN] = {0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
+
+#define DRV_MODULE_NAME         "ldmvsw"
+#define DRV_MODULE_VERSION      "1.0"
+#define DRV_MODULE_RELDATE      "Jan 15, 2016"
+
+static char version[] =
+        DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
+MODULE_AUTHOR("Oracle");
+MODULE_DESCRIPTION("Sun4v LDOM Virtual Switch Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_MODULE_VERSION);
+
+/* Ordered from largest major to lowest */
+static struct vio_version vsw_versions[] = {
+        { .major = 1, .minor = 8 },
+        { .major = 1, .minor = 7 },
+        { .major = 1, .minor = 6 },
+        { .major = 1, .minor = 0 },
+};
+
+static void vsw_get_drvinfo(struct net_device *dev,
+                            struct ethtool_drvinfo *info)
+{
+        strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
+        strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
+}
+
+static u32 vsw_get_msglevel(struct net_device *dev)
+{
+        struct vnet_port *port = netdev_priv(dev);
+
+        return port->vp->msg_enable;
+}
+
+static void vsw_set_msglevel(struct net_device *dev, u32 value)
+{
+        struct vnet_port *port = netdev_priv(dev);
+
+        port->vp->msg_enable = value;
+}
+
+static const struct ethtool_ops vsw_ethtool_ops = {
+        .get_drvinfo            = vsw_get_drvinfo,
+        .get_msglevel           = vsw_get_msglevel,
+        .set_msglevel           = vsw_set_msglevel,
+        .get_link               = ethtool_op_get_link,
+};
+
+static LIST_HEAD(vnet_list);
+static DEFINE_MUTEX(vnet_list_mutex);
+
+/* func arg to vnet_start_xmit_common() to get the proper tx port */
+static struct vnet_port *vsw_tx_port_find(struct sk_buff *skb,
+                                          struct net_device *dev)
+{
+        struct vnet_port *port = netdev_priv(dev);
+
+        return port;
+}
+
+static u16 vsw_select_queue(struct net_device *dev, struct sk_buff *skb,
+                            void *accel_priv, select_queue_fallback_t fallback)
+{
+        struct vnet_port *port = netdev_priv(dev);
+
+        if (!port)
+                return 0;
+
+        return port->q_index;
+}
+
+/* Wrappers to common functions */
+static int vsw_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+        return sunvnet_start_xmit_common(skb, dev, vsw_tx_port_find);
+}
+
+static void vsw_set_rx_mode(struct net_device *dev)
+{
+        struct vnet_port *port = netdev_priv(dev);
+
+        return sunvnet_set_rx_mode_common(dev, port->vp);
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void vsw_poll_controller(struct net_device *dev)
+{
+        struct vnet_port *port = netdev_priv(dev);
+
+        return sunvnet_poll_controller_common(dev, port->vp);
+}
+#endif
+
+static const struct net_device_ops vsw_ops = {
+        .ndo_open               = sunvnet_open_common,
+        .ndo_stop               = sunvnet_close_common,
+        .ndo_set_rx_mode        = vsw_set_rx_mode,
+        .ndo_set_mac_address    = sunvnet_set_mac_addr_common,
+        .ndo_validate_addr      = eth_validate_addr,
+        .ndo_tx_timeout         = sunvnet_tx_timeout_common,
+        .ndo_change_mtu         = sunvnet_change_mtu_common,
+        .ndo_start_xmit         = vsw_start_xmit,
+        .ndo_select_queue       = vsw_select_queue,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+        .ndo_poll_controller    = vsw_poll_controller,
+#endif
+};
+
+static const char *local_mac_prop = "local-mac-address";
+static const char *cfg_handle_prop = "cfg-handle";
+
+static struct vnet *vsw_get_vnet(struct mdesc_handle *hp,
+                                 u64 port_node,
+                                 u64 *handle)
+{
+        struct vnet *vp;
+        struct vnet *iter;
+        const u64 *local_mac = NULL;
+        const u64 *cfghandle = NULL;
+        u64 a;
+
+        /* Get the parent virtual-network-switch macaddr and cfghandle */
+        mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
+                u64 target = mdesc_arc_target(hp, a);
+                const char *name;
+
+                name = mdesc_get_property(hp, target, "name", NULL);
+                if (!name || strcmp(name, "virtual-network-switch"))
+                        continue;
+
+                local_mac = mdesc_get_property(hp, target,
+                                               local_mac_prop, NULL);
+                cfghandle = mdesc_get_property(hp, target,
+                                               cfg_handle_prop, NULL);
+                break;
+        }
+        if (!local_mac || !cfghandle)
+                return ERR_PTR(-ENODEV);
+
+        /* find or create associated vnet */
+        vp = NULL;
+        mutex_lock(&vnet_list_mutex);
+        list_for_each_entry(iter, &vnet_list, list) {
+                if (iter->local_mac == *local_mac) {
+                        vp = iter;
+                        break;
+                }
+        }
+
+        if (!vp) {
+                vp = kzalloc(sizeof(*vp), GFP_KERNEL);
+                if (unlikely(!vp)) {
+                        mutex_unlock(&vnet_list_mutex);
+                        return ERR_PTR(-ENOMEM);
+                }
+
+                spin_lock_init(&vp->lock);
+                INIT_LIST_HEAD(&vp->port_list);
+                INIT_LIST_HEAD(&vp->list);
+                vp->local_mac = *local_mac;
+                list_add(&vp->list, &vnet_list);
+        }
+
+        mutex_unlock(&vnet_list_mutex);
+
+        *handle = (u64)*cfghandle;
+
+        return vp;
+}
+
+static struct net_device *vsw_alloc_netdev(u8 hwaddr[],
+                                           struct vio_dev *vdev,
+                                           u64 handle,
+                                           u64 port_id)
+{
+        struct net_device *dev;
+        struct vnet_port *port;
+        int i;
+
+        dev = alloc_etherdev_mqs(sizeof(*port), VNET_MAX_TXQS, 1);
+        if (!dev)
+                return ERR_PTR(-ENOMEM);
+        dev->needed_headroom = VNET_PACKET_SKIP + 8;
+        dev->needed_tailroom = 8;
+
+        for (i = 0; i < ETH_ALEN; i++) {
+                dev->dev_addr[i] = hwaddr[i];
+                dev->perm_addr[i] = dev->dev_addr[i];
+        }
+
+        sprintf(dev->name, "vif%d.%d", (int)handle, (int)port_id);
+
+        dev->netdev_ops = &vsw_ops;
+        dev->ethtool_ops = &vsw_ethtool_ops;
+        dev->watchdog_timeo = VSW_TX_TIMEOUT;
+
+        dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE |
+                           NETIF_F_HW_CSUM | NETIF_F_SG;
+        dev->features = dev->hw_features;
+
+        SET_NETDEV_DEV(dev, &vdev->dev);
+
+        return dev;
+}
+
+static struct ldc_channel_config vsw_ldc_cfg = {
+        .event          = sunvnet_event_common,
+        .mtu            = 64,
+        .mode           = LDC_MODE_UNRELIABLE,
+};
+
+static struct vio_driver_ops vsw_vio_ops = {
+        .send_attr              = sunvnet_send_attr_common,
+        .handle_attr            = sunvnet_handle_attr_common,
+        .handshake_complete     = sunvnet_handshake_complete_common,
+};
+
+static void print_version(void)
+{
+        printk_once(KERN_INFO "%s", version);
+}
+
+static const char *remote_macaddr_prop = "remote-mac-address";
+static const char *id_prop = "id";
+
+static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
+{
+        struct mdesc_handle *hp;
+        struct vnet_port *port;
+        unsigned long flags;
+        struct vnet *vp;
+        struct net_device *dev;
+        const u64 *rmac;
+        int len, i, err;
+        const u64 *port_id;
+        u64 handle;
+
+        print_version();
+
+        hp = mdesc_grab();
+
+        rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
+        err = -ENODEV;
+        if (!rmac) {
+                pr_err("Port lacks %s property\n", remote_macaddr_prop);
+                mdesc_release(hp);
+                return err;
+        }
+
+        port_id = mdesc_get_property(hp, vdev->mp, id_prop, NULL);
+        err = -ENODEV;
+        if (!port_id) {
+                pr_err("Port lacks %s property\n", id_prop);
+                mdesc_release(hp);
+                return err;
+        }
+
+        /* Get (or create) the vnet associated with this port */
+        vp = vsw_get_vnet(hp, vdev->mp, &handle);
+        if (unlikely(IS_ERR(vp))) {
+                err = PTR_ERR(vp);
+                pr_err("Failed to get vnet for vsw-port\n");
+                mdesc_release(hp);
+                return err;
+        }
+
+        mdesc_release(hp);
+
+        dev = vsw_alloc_netdev(vsw_port_hwaddr, vdev, handle, *port_id);
+        if (IS_ERR(dev)) {
+                err = PTR_ERR(dev);
+                pr_err("Failed to alloc netdev for vsw-port\n");
+                return err;
+        }
+
+        port = netdev_priv(dev);
+
+        INIT_LIST_HEAD(&port->list);
+
+        for (i = 0; i < ETH_ALEN; i++)
+                port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
+
+        port->vp = vp;
+        port->dev = dev;
+        port->switch_port = 1;
+        port->tso = true;
+        port->tsolen = 0;
+
+        /* Mark the port as belonging to ldmvsw which directs the
+         * the common code to use the net_device in the vnet_port
+         * rather than the net_device in the vnet (which is used
+         * by sunvnet). This bit is used by the VNET_PORT_TO_NET_DEVICE
+         * macro.
+         */
+        port->vsw = 1;
+
+        err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
+                              vsw_versions, ARRAY_SIZE(vsw_versions),
+                              &vsw_vio_ops, dev->name);
+        if (err)
+                goto err_out_free_dev;
+
+        err = vio_ldc_alloc(&port->vio, &vsw_ldc_cfg, port);
+        if (err)
+                goto err_out_free_dev;
+
+        dev_set_drvdata(&vdev->dev, port);
+
+        netif_napi_add(dev, &port->napi, sunvnet_poll_common,
+                       NAPI_POLL_WEIGHT);
+
+        spin_lock_irqsave(&vp->lock, flags);
+        list_add_rcu(&port->list, &vp->port_list);
+        spin_unlock_irqrestore(&vp->lock, flags);
+
+        setup_timer(&port->clean_timer, sunvnet_clean_timer_expire_common,
+                    (unsigned long)port);
+
+        err = register_netdev(dev);
+        if (err) {
+                pr_err("Cannot register net device, aborting\n");
+                goto err_out_del_timer;
+        }
+
+        spin_lock_irqsave(&vp->lock, flags);
+        sunvnet_port_add_txq_common(port);
+        spin_unlock_irqrestore(&vp->lock, flags);
+
+        napi_enable(&port->napi);
+        vio_port_up(&port->vio);
+
+        netdev_info(dev, "LDOM vsw-port %pM\n", dev->dev_addr);
+
+        pr_info("%s: PORT ( remote-mac %pM%s )\n", dev->name,
+                port->raddr, " switch-port");
+
+        return 0;
+
+err_out_del_timer:
+        del_timer_sync(&port->clean_timer);
+        list_del_rcu(&port->list);
+        synchronize_rcu();
+        netif_napi_del(&port->napi);
+        dev_set_drvdata(&vdev->dev, NULL);
+        vio_ldc_free(&port->vio);
+
+err_out_free_dev:
+        free_netdev(dev);
+        return err;
+}
+
+static int vsw_port_remove(struct vio_dev *vdev)
+{
+        struct vnet_port *port = dev_get_drvdata(&vdev->dev);
+        unsigned long flags;
+
+        if (port) {
+                del_timer_sync(&port->vio.timer);
+
+                napi_disable(&port->napi);
+
+                list_del_rcu(&port->list);
+
+                synchronize_rcu();
+                del_timer_sync(&port->clean_timer);
+                spin_lock_irqsave(&port->vp->lock, flags);
+                sunvnet_port_rm_txq_common(port);
+                spin_unlock_irqrestore(&port->vp->lock, flags);
+                netif_napi_del(&port->napi);
+                sunvnet_port_free_tx_bufs_common(port);
+                vio_ldc_free(&port->vio);
+
+                dev_set_drvdata(&vdev->dev, NULL);
+
+                unregister_netdev(port->dev);
+                free_netdev(port->dev);
+        }
+
+        return 0;
+}
+
+static void vsw_cleanup(void)
+{
+        struct vnet *vp;
+
+        /* just need to free up the vnet list */
+        mutex_lock(&vnet_list_mutex);
+        while (!list_empty(&vnet_list)) {
+                vp = list_first_entry(&vnet_list, struct vnet, list);
+                list_del(&vp->list);
+                /* vio_unregister_driver() should have cleaned up port_list */
+                if (!list_empty(&vp->port_list))
+                        pr_err("Ports not removed by VIO subsystem!\n");
+                kfree(vp);
+        }
+        mutex_unlock(&vnet_list_mutex);
+}
+
+static const struct vio_device_id vsw_port_match[] = {
+        {
+                .type = "vsw-port",
+        },
+        {},
+};
+MODULE_DEVICE_TABLE(vio, vsw_port_match);
+
+static struct vio_driver vsw_port_driver = {
+        .id_table       = vsw_port_match,
+        .probe          = vsw_port_probe,
+        .remove         = vsw_port_remove,
+        .name           = "vsw_port",
+};
+
+static int __init vsw_init(void)
+{
+        return vio_register_driver(&vsw_port_driver);
+}
+
+static void __exit vsw_exit(void)
+{
+        vio_unregister_driver(&vsw_port_driver);
+        vsw_cleanup();
+}
+
+module_init(vsw_init);
+module_exit(vsw_exit);