537 lines
14 KiB
C
537 lines
14 KiB
C
/*
|
|
* Copyright (c) 2009, Microsoft Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
|
|
* Place - Suite 330, Boston, MA 02111-1307 USA.
|
|
*
|
|
* Authors:
|
|
* Haiyang Zhang <haiyangz@microsoft.com>
|
|
* Hank Janssen <hjanssen@microsoft.com>
|
|
*/
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/device.h>
|
|
#include <linux/io.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/inetdevice.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/in.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/dmi.h>
|
|
#include <linux/pci.h>
|
|
#include <net/arp.h>
|
|
#include <net/route.h>
|
|
#include <net/sock.h>
|
|
#include <net/pkt_sched.h>
|
|
|
|
#include "hyperv.h"
|
|
#include "hyperv_net.h"
|
|
|
|
struct net_device_context {
|
|
/* point back to our device context */
|
|
struct hv_device *device_ctx;
|
|
unsigned long avail;
|
|
struct work_struct work;
|
|
};
|
|
|
|
|
|
#define PACKET_PAGES_LOWATER 8
|
|
/* Need this many pages to handle worst case fragmented packet */
|
|
#define PACKET_PAGES_HIWATER (MAX_SKB_FRAGS + 2)
|
|
|
|
static int ring_size = 128;
|
|
module_param(ring_size, int, S_IRUGO);
|
|
MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
|
|
|
|
/* no-op so the netdev core doesn't return -EINVAL when modifying the the
|
|
* multicast address list in SIOCADDMULTI. hv is setup to get all multicast
|
|
* when it calls RndisFilterOnOpen() */
|
|
static void netvsc_set_multicast_list(struct net_device *net)
|
|
{
|
|
}
|
|
|
|
static int netvsc_open(struct net_device *net)
|
|
{
|
|
struct net_device_context *net_device_ctx = netdev_priv(net);
|
|
struct hv_device *device_obj = net_device_ctx->device_ctx;
|
|
int ret = 0;
|
|
|
|
if (netif_carrier_ok(net)) {
|
|
/* Open up the device */
|
|
ret = rndis_filter_open(device_obj);
|
|
if (ret != 0) {
|
|
netdev_err(net, "unable to open device (ret %d).\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
netif_start_queue(net);
|
|
} else {
|
|
netdev_err(net, "unable to open device...link is down.\n");
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int netvsc_close(struct net_device *net)
|
|
{
|
|
struct net_device_context *net_device_ctx = netdev_priv(net);
|
|
struct hv_device *device_obj = net_device_ctx->device_ctx;
|
|
int ret;
|
|
|
|
netif_stop_queue(net);
|
|
|
|
ret = rndis_filter_close(device_obj);
|
|
if (ret != 0)
|
|
netdev_err(net, "unable to close device (ret %d).\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void netvsc_xmit_completion(void *context)
|
|
{
|
|
struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context;
|
|
struct sk_buff *skb = (struct sk_buff *)
|
|
(unsigned long)packet->completion.send.send_completion_tid;
|
|
|
|
kfree(packet);
|
|
|
|
if (skb) {
|
|
struct net_device *net = skb->dev;
|
|
struct net_device_context *net_device_ctx = netdev_priv(net);
|
|
unsigned int num_pages = skb_shinfo(skb)->nr_frags + 2;
|
|
|
|
dev_kfree_skb_any(skb);
|
|
|
|
net_device_ctx->avail += num_pages;
|
|
if (net_device_ctx->avail >= PACKET_PAGES_HIWATER)
|
|
netif_wake_queue(net);
|
|
}
|
|
}
|
|
|
|
static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
|
|
{
|
|
struct net_device_context *net_device_ctx = netdev_priv(net);
|
|
struct netvsc_driver *net_drv_obj =
|
|
drv_to_netvscdrv(net_device_ctx->device_ctx->device.driver);
|
|
struct hv_netvsc_packet *packet;
|
|
int ret;
|
|
unsigned int i, num_pages;
|
|
|
|
/* Add 1 for skb->data and additional one for RNDIS */
|
|
num_pages = skb_shinfo(skb)->nr_frags + 1 + 1;
|
|
if (num_pages > net_device_ctx->avail)
|
|
return NETDEV_TX_BUSY;
|
|
|
|
/* Allocate a netvsc packet based on # of frags. */
|
|
packet = kzalloc(sizeof(struct hv_netvsc_packet) +
|
|
(num_pages * sizeof(struct hv_page_buffer)) +
|
|
net_drv_obj->req_ext_size, GFP_ATOMIC);
|
|
if (!packet) {
|
|
/* out of memory, silently drop packet */
|
|
netdev_err(net, "unable to allocate hv_netvsc_packet\n");
|
|
|
|
dev_kfree_skb(skb);
|
|
net->stats.tx_dropped++;
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
packet->extension = (void *)(unsigned long)packet +
|
|
sizeof(struct hv_netvsc_packet) +
|
|
(num_pages * sizeof(struct hv_page_buffer));
|
|
|
|
/* Setup the rndis header */
|
|
packet->page_buf_cnt = num_pages;
|
|
|
|
/* TODO: Flush all write buffers/ memory fence ??? */
|
|
/* wmb(); */
|
|
|
|
/* Initialize it from the skb */
|
|
packet->total_data_buflen = skb->len;
|
|
|
|
/* Start filling in the page buffers starting after RNDIS buffer. */
|
|
packet->page_buf[1].pfn = virt_to_phys(skb->data) >> PAGE_SHIFT;
|
|
packet->page_buf[1].offset
|
|
= (unsigned long)skb->data & (PAGE_SIZE - 1);
|
|
packet->page_buf[1].len = skb_headlen(skb);
|
|
|
|
/* Additional fragments are after SKB data */
|
|
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
|
|
skb_frag_t *f = &skb_shinfo(skb)->frags[i];
|
|
|
|
packet->page_buf[i+2].pfn = page_to_pfn(f->page);
|
|
packet->page_buf[i+2].offset = f->page_offset;
|
|
packet->page_buf[i+2].len = f->size;
|
|
}
|
|
|
|
/* Set the completion routine */
|
|
packet->completion.send.send_completion = netvsc_xmit_completion;
|
|
packet->completion.send.send_completion_ctx = packet;
|
|
packet->completion.send.send_completion_tid = (unsigned long)skb;
|
|
|
|
ret = net_drv_obj->send(net_device_ctx->device_ctx,
|
|
packet);
|
|
if (ret == 0) {
|
|
net->stats.tx_bytes += skb->len;
|
|
net->stats.tx_packets++;
|
|
|
|
net_device_ctx->avail -= num_pages;
|
|
if (net_device_ctx->avail < PACKET_PAGES_LOWATER)
|
|
netif_stop_queue(net);
|
|
} else {
|
|
/* we are shutting down or bus overloaded, just drop packet */
|
|
net->stats.tx_dropped++;
|
|
netvsc_xmit_completion(packet);
|
|
}
|
|
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
/*
|
|
* netvsc_linkstatus_callback - Link up/down notification
|
|
*/
|
|
static void netvsc_linkstatus_callback(struct hv_device *device_obj,
|
|
unsigned int status)
|
|
{
|
|
struct net_device *net = dev_get_drvdata(&device_obj->device);
|
|
struct net_device_context *ndev_ctx;
|
|
|
|
if (!net) {
|
|
netdev_err(net, "got link status but net device "
|
|
"not initialized yet\n");
|
|
return;
|
|
}
|
|
|
|
if (status == 1) {
|
|
netif_carrier_on(net);
|
|
netif_wake_queue(net);
|
|
netif_notify_peers(net);
|
|
ndev_ctx = netdev_priv(net);
|
|
schedule_work(&ndev_ctx->work);
|
|
} else {
|
|
netif_carrier_off(net);
|
|
netif_stop_queue(net);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* netvsc_recv_callback - Callback when we receive a packet from the
|
|
* "wire" on the specified device.
|
|
*/
|
|
static int netvsc_recv_callback(struct hv_device *device_obj,
|
|
struct hv_netvsc_packet *packet)
|
|
{
|
|
struct net_device *net = dev_get_drvdata(&device_obj->device);
|
|
struct sk_buff *skb;
|
|
void *data;
|
|
int i;
|
|
unsigned long flags;
|
|
|
|
if (!net) {
|
|
netdev_err(net, "got receive callback but net device"
|
|
" not initialized yet\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Allocate a skb - TODO direct I/O to pages? */
|
|
skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
|
|
if (unlikely(!skb)) {
|
|
++net->stats.rx_dropped;
|
|
return 0;
|
|
}
|
|
|
|
/* for kmap_atomic */
|
|
local_irq_save(flags);
|
|
|
|
/*
|
|
* Copy to skb. This copy is needed here since the memory pointed by
|
|
* hv_netvsc_packet cannot be deallocated
|
|
*/
|
|
for (i = 0; i < packet->page_buf_cnt; i++) {
|
|
data = kmap_atomic(pfn_to_page(packet->page_buf[i].pfn),
|
|
KM_IRQ1);
|
|
data = (void *)(unsigned long)data +
|
|
packet->page_buf[i].offset;
|
|
|
|
memcpy(skb_put(skb, packet->page_buf[i].len), data,
|
|
packet->page_buf[i].len);
|
|
|
|
kunmap_atomic((void *)((unsigned long)data -
|
|
packet->page_buf[i].offset), KM_IRQ1);
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
|
|
skb->protocol = eth_type_trans(skb, net);
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
|
|
net->stats.rx_packets++;
|
|
net->stats.rx_bytes += skb->len;
|
|
|
|
/*
|
|
* Pass the skb back up. Network stack will deallocate the skb when it
|
|
* is done.
|
|
* TODO - use NAPI?
|
|
*/
|
|
netif_rx(skb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void netvsc_get_drvinfo(struct net_device *net,
|
|
struct ethtool_drvinfo *info)
|
|
{
|
|
strcpy(info->driver, "hv_netvsc");
|
|
strcpy(info->version, HV_DRV_VERSION);
|
|
strcpy(info->fw_version, "N/A");
|
|
}
|
|
|
|
static const struct ethtool_ops ethtool_ops = {
|
|
.get_drvinfo = netvsc_get_drvinfo,
|
|
.get_link = ethtool_op_get_link,
|
|
};
|
|
|
|
static const struct net_device_ops device_ops = {
|
|
.ndo_open = netvsc_open,
|
|
.ndo_stop = netvsc_close,
|
|
.ndo_start_xmit = netvsc_start_xmit,
|
|
.ndo_set_multicast_list = netvsc_set_multicast_list,
|
|
.ndo_change_mtu = eth_change_mtu,
|
|
.ndo_validate_addr = eth_validate_addr,
|
|
.ndo_set_mac_address = eth_mac_addr,
|
|
};
|
|
|
|
/*
|
|
* Send GARP packet to network peers after migrations.
|
|
* After Quick Migration, the network is not immediately operational in the
|
|
* current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add
|
|
* another netif_notify_peers() into a scheduled work, otherwise GARP packet
|
|
* will not be sent after quick migration, and cause network disconnection.
|
|
*/
|
|
static void netvsc_send_garp(struct work_struct *w)
|
|
{
|
|
struct net_device_context *ndev_ctx;
|
|
struct net_device *net;
|
|
|
|
msleep(20);
|
|
ndev_ctx = container_of(w, struct net_device_context, work);
|
|
net = dev_get_drvdata(&ndev_ctx->device_ctx->device);
|
|
netif_notify_peers(net);
|
|
}
|
|
|
|
|
|
static int netvsc_probe(struct hv_device *dev)
|
|
{
|
|
struct net_device *net = NULL;
|
|
struct net_device_context *net_device_ctx;
|
|
struct netvsc_device_info device_info;
|
|
int ret;
|
|
|
|
net = alloc_etherdev(sizeof(struct net_device_context));
|
|
if (!net)
|
|
return -1;
|
|
|
|
/* Set initial state */
|
|
netif_carrier_off(net);
|
|
|
|
net_device_ctx = netdev_priv(net);
|
|
net_device_ctx->device_ctx = dev;
|
|
net_device_ctx->avail = ring_size;
|
|
dev_set_drvdata(&dev->device, net);
|
|
INIT_WORK(&net_device_ctx->work, netvsc_send_garp);
|
|
|
|
/* Notify the netvsc driver of the new device */
|
|
ret = rndis_filte_device_add(dev, &device_info);
|
|
if (ret != 0) {
|
|
free_netdev(net);
|
|
dev_set_drvdata(&dev->device, NULL);
|
|
|
|
netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* If carrier is still off ie we did not get a link status callback,
|
|
* update it if necessary
|
|
*/
|
|
/*
|
|
* FIXME: We should use a atomic or test/set instead to avoid getting
|
|
* out of sync with the device's link status
|
|
*/
|
|
if (!netif_carrier_ok(net))
|
|
if (!device_info.link_state)
|
|
netif_carrier_on(net);
|
|
|
|
memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
|
|
|
|
net->netdev_ops = &device_ops;
|
|
|
|
/* TODO: Add GSO and Checksum offload */
|
|
net->hw_features = NETIF_F_SG;
|
|
net->features = NETIF_F_SG;
|
|
|
|
SET_ETHTOOL_OPS(net, ðtool_ops);
|
|
SET_NETDEV_DEV(net, &dev->device);
|
|
|
|
ret = register_netdev(net);
|
|
if (ret != 0) {
|
|
/* Remove the device and release the resource */
|
|
rndis_filter_device_remove(dev);
|
|
free_netdev(net);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int netvsc_remove(struct hv_device *dev)
|
|
{
|
|
struct net_device *net = dev_get_drvdata(&dev->device);
|
|
int ret;
|
|
|
|
if (net == NULL) {
|
|
dev_err(&dev->device, "No net device to remove\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Stop outbound asap */
|
|
netif_stop_queue(net);
|
|
/* netif_carrier_off(net); */
|
|
|
|
unregister_netdev(net);
|
|
|
|
/*
|
|
* Call to the vsc driver to let it know that the device is being
|
|
* removed
|
|
*/
|
|
ret = rndis_filter_device_remove(dev);
|
|
if (ret != 0) {
|
|
/* TODO: */
|
|
netdev_err(net, "unable to remove vsc device (ret %d)\n", ret);
|
|
}
|
|
|
|
free_netdev(net);
|
|
return ret;
|
|
}
|
|
|
|
static int netvsc_drv_exit_cb(struct device *dev, void *data)
|
|
{
|
|
struct device **curr = (struct device **)data;
|
|
|
|
*curr = dev;
|
|
/* stop iterating */
|
|
return 1;
|
|
}
|
|
|
|
/* The one and only one */
|
|
static struct netvsc_driver netvsc_drv = {
|
|
.base.probe = netvsc_probe,
|
|
.base.remove = netvsc_remove,
|
|
};
|
|
|
|
static void netvsc_drv_exit(void)
|
|
{
|
|
struct hv_driver *drv = &netvsc_drv.base;
|
|
struct device *current_dev;
|
|
int ret;
|
|
|
|
while (1) {
|
|
current_dev = NULL;
|
|
|
|
/* Get the device */
|
|
ret = driver_for_each_device(&drv->driver, NULL,
|
|
¤t_dev, netvsc_drv_exit_cb);
|
|
|
|
if (current_dev == NULL)
|
|
break;
|
|
|
|
/* Initiate removal from the top-down */
|
|
dev_err(current_dev, "unregistering device (%s)...\n",
|
|
dev_name(current_dev));
|
|
|
|
device_unregister(current_dev);
|
|
}
|
|
|
|
vmbus_child_driver_unregister(&drv->driver);
|
|
|
|
return;
|
|
}
|
|
|
|
static int netvsc_drv_init(int (*drv_init)(struct hv_driver *drv))
|
|
{
|
|
struct netvsc_driver *net_drv_obj = &netvsc_drv;
|
|
struct hv_driver *drv = &netvsc_drv.base;
|
|
int ret;
|
|
|
|
net_drv_obj->ring_buf_size = ring_size * PAGE_SIZE;
|
|
net_drv_obj->recv_cb = netvsc_recv_callback;
|
|
net_drv_obj->link_status_change = netvsc_linkstatus_callback;
|
|
|
|
/* Callback to client driver to complete the initialization */
|
|
drv_init(&net_drv_obj->base);
|
|
|
|
drv->driver.name = net_drv_obj->base.name;
|
|
|
|
/* The driver belongs to vmbus */
|
|
ret = vmbus_child_driver_register(&drv->driver);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct dmi_system_id __initconst
|
|
hv_netvsc_dmi_table[] __maybe_unused = {
|
|
{
|
|
.ident = "Hyper-V",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
|
|
DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"),
|
|
},
|
|
},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(dmi, hv_netvsc_dmi_table);
|
|
|
|
static int __init netvsc_init(void)
|
|
{
|
|
pr_info("initializing....");
|
|
|
|
if (!dmi_check_system(hv_netvsc_dmi_table))
|
|
return -ENODEV;
|
|
|
|
return netvsc_drv_init(netvsc_initialize);
|
|
}
|
|
|
|
static void __exit netvsc_exit(void)
|
|
{
|
|
netvsc_drv_exit();
|
|
}
|
|
|
|
static const struct pci_device_id __initconst
|
|
hv_netvsc_pci_table[] __maybe_unused = {
|
|
{ PCI_DEVICE(0x1414, 0x5353) }, /* VGA compatible controller */
|
|
{ 0 }
|
|
};
|
|
MODULE_DEVICE_TABLE(pci, hv_netvsc_pci_table);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(HV_DRV_VERSION);
|
|
MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
|
|
|
|
module_init(netvsc_init);
|
|
module_exit(netvsc_exit);
|