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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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bd1de70916
This fixes up all of the sparse warnings about static functions. Cc: Hank Janssen <hjanssen@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
705 lines
17 KiB
C
705 lines
17 KiB
C
/*
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*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Hank Janssen <hjanssen@microsoft.com>
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/highmem.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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#include <linux/inetdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/in.h>
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#include <net/arp.h>
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#include <net/route.h>
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#include <net/sock.h>
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#include <net/pkt_sched.h>
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#include "include/logging.h"
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#include "include/vmbus.h"
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#include "include/NetVscApi.h"
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MODULE_LICENSE("GPL");
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/* Static decl */
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static int netvsc_probe(struct device *device);
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static int netvsc_remove(struct device *device);
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static int netvsc_open(struct net_device *net);
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static void netvsc_xmit_completion(void *context);
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static int netvsc_start_xmit (struct sk_buff *skb, struct net_device *net);
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static int netvsc_recv_callback(struct hv_device *device_obj, struct hv_netvsc_packet *Packet);
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static int netvsc_close(struct net_device *net);
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static struct net_device_stats *netvsc_get_stats(struct net_device *net);
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static void netvsc_linkstatus_callback(struct hv_device *device_obj, unsigned int status);
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/* Data types */
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struct net_device_context {
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struct device_context *device_ctx; /* point back to our device context */
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struct net_device_stats stats;
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};
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struct netvsc_driver_context {
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/* !! These must be the first 2 fields !! */
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struct driver_context drv_ctx;
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NETVSC_DRIVER_OBJECT drv_obj;
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};
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/* Globals */
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static int netvsc_ringbuffer_size = NETVSC_DEVICE_RING_BUFFER_SIZE;
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/* The one and only one */
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static struct netvsc_driver_context g_netvsc_drv;
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/* Routines */
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/*++
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Name: netvsc_drv_init()
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Desc: NetVsc driver initialization
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--*/
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static int netvsc_drv_init(PFN_DRIVERINITIALIZE pfn_drv_init)
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{
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int ret=0;
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NETVSC_DRIVER_OBJECT *net_drv_obj=&g_netvsc_drv.drv_obj;
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struct driver_context *drv_ctx=&g_netvsc_drv.drv_ctx;
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DPRINT_ENTER(NETVSC_DRV);
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vmbus_get_interface(&net_drv_obj->Base.VmbusChannelInterface);
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net_drv_obj->RingBufferSize = netvsc_ringbuffer_size;
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net_drv_obj->OnReceiveCallback = netvsc_recv_callback;
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net_drv_obj->OnLinkStatusChanged = netvsc_linkstatus_callback;
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/* Callback to client driver to complete the initialization */
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pfn_drv_init(&net_drv_obj->Base);
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drv_ctx->driver.name = net_drv_obj->Base.name;
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memcpy(&drv_ctx->class_id, &net_drv_obj->Base.deviceType, sizeof(GUID));
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drv_ctx->probe = netvsc_probe;
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drv_ctx->remove = netvsc_remove;
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/* The driver belongs to vmbus */
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ret = vmbus_child_driver_register(drv_ctx);
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DPRINT_EXIT(NETVSC_DRV);
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return ret;
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}
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/*++
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Name: netvsc_get_stats()
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Desc: Get the network stats
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--*/
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static struct net_device_stats *netvsc_get_stats(struct net_device *net)
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{
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struct net_device_context *net_device_ctx = netdev_priv(net);
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return &net_device_ctx->stats;
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}
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/*++
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Name: netvsc_set_multicast_list()
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Desc: Set the multicast list
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Remark: No-op here
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--*/
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static void netvsc_set_multicast_list(struct net_device *net)
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{
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}
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static const struct net_device_ops device_ops = {
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.ndo_open = netvsc_open,
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.ndo_stop = netvsc_close,
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.ndo_start_xmit = netvsc_start_xmit,
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.ndo_get_stats = netvsc_get_stats,
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.ndo_set_multicast_list = netvsc_set_multicast_list,
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};
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/*++
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Name: netvsc_probe()
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Desc: Add the specified new device to this driver
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--*/
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static int netvsc_probe(struct device *device)
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{
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int ret=0;
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struct driver_context *driver_ctx = driver_to_driver_context(device->driver);
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struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx;
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NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj;
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struct device_context *device_ctx = device_to_device_context(device);
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struct hv_device *device_obj = &device_ctx->device_obj;
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struct net_device *net = NULL;
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struct net_device_context *net_device_ctx;
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NETVSC_DEVICE_INFO device_info;
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DPRINT_ENTER(NETVSC_DRV);
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if (!net_drv_obj->Base.OnDeviceAdd)
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{
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return -1;
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}
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net = alloc_netdev(sizeof(struct net_device_context), "seth%d", ether_setup);
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/* net = alloc_etherdev(sizeof(struct net_device_context)); */
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if (!net)
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{
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return -1;
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}
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/* Set initial state */
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netif_carrier_off(net);
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netif_stop_queue(net);
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net_device_ctx = netdev_priv(net);
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net_device_ctx->device_ctx = device_ctx;
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dev_set_drvdata(device, net);
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/* Notify the netvsc driver of the new device */
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ret = net_drv_obj->Base.OnDeviceAdd(device_obj, (void*)&device_info);
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if (ret != 0)
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{
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free_netdev(net);
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dev_set_drvdata(device, NULL);
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DPRINT_ERR(NETVSC_DRV, "unable to add netvsc device (ret %d)", ret);
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return ret;
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}
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/* If carrier is still off ie we did not get a link status callback, update it if necessary */
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/* FIXME: We should use a atomic or test/set instead to avoid getting out of sync with the device's link status */
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if (!netif_carrier_ok(net))
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{
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if (!device_info.LinkState)
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{
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netif_carrier_on(net);
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}
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}
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memcpy(net->dev_addr, device_info.MacAddr, ETH_ALEN);
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net->netdev_ops = &device_ops;
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SET_NETDEV_DEV(net, device);
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ret = register_netdev(net);
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if (ret != 0)
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{
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/* Remove the device and release the resource */
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net_drv_obj->Base.OnDeviceRemove(device_obj);
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free_netdev(net);
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}
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DPRINT_EXIT(NETVSC_DRV);
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return ret;
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}
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static int netvsc_remove(struct device *device)
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{
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int ret=0;
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struct driver_context *driver_ctx = driver_to_driver_context(device->driver);
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struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx;
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NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj;
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struct device_context *device_ctx = device_to_device_context(device);
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struct net_device *net = dev_get_drvdata(&device_ctx->device);
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struct hv_device *device_obj = &device_ctx->device_obj;
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DPRINT_ENTER(NETVSC_DRV);
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if (net == NULL)
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{
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DPRINT_INFO(NETVSC, "no net device to remove");
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DPRINT_EXIT(NETVSC_DRV);
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return 0;
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}
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if (!net_drv_obj->Base.OnDeviceRemove)
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{
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DPRINT_EXIT(NETVSC_DRV);
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return -1;
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}
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/* Stop outbound asap */
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netif_stop_queue(net);
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/* netif_carrier_off(net); */
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unregister_netdev(net);
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/* Call to the vsc driver to let it know that the device is being removed */
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ret = net_drv_obj->Base.OnDeviceRemove(device_obj);
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if (ret != 0)
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{
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/* TODO: */
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DPRINT_ERR(NETVSC, "unable to remove vsc device (ret %d)", ret);
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}
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free_netdev(net);
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DPRINT_EXIT(NETVSC_DRV);
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return ret;
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}
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/*++
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Name: netvsc_open()
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Desc: Open the specified interface device
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--*/
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static int netvsc_open(struct net_device *net)
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{
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int ret=0;
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struct net_device_context *net_device_ctx = netdev_priv(net);
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struct driver_context *driver_ctx = driver_to_driver_context(net_device_ctx->device_ctx->device.driver);
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struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx;
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NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj;
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struct hv_device *device_obj = &net_device_ctx->device_ctx->device_obj;
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DPRINT_ENTER(NETVSC_DRV);
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if (netif_carrier_ok(net))
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{
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memset(&net_device_ctx->stats, 0 , sizeof(struct net_device_stats));
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/* Open up the device */
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ret = net_drv_obj->OnOpen(device_obj);
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if (ret != 0)
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{
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DPRINT_ERR(NETVSC_DRV, "unable to open device (ret %d).", ret);
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return ret;
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}
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netif_start_queue(net);
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}
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else
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{
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DPRINT_ERR(NETVSC_DRV, "unable to open device...link is down.");
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}
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DPRINT_EXIT(NETVSC_DRV);
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return ret;
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}
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/*++
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Name: netvsc_close()
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Desc: Close the specified interface device
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--*/
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static int netvsc_close(struct net_device *net)
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{
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int ret=0;
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struct net_device_context *net_device_ctx = netdev_priv(net);
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struct driver_context *driver_ctx = driver_to_driver_context(net_device_ctx->device_ctx->device.driver);
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struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx;
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NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj;
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struct hv_device *device_obj = &net_device_ctx->device_ctx->device_obj;
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DPRINT_ENTER(NETVSC_DRV);
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netif_stop_queue(net);
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ret = net_drv_obj->OnClose(device_obj);
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if (ret != 0)
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{
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DPRINT_ERR(NETVSC_DRV, "unable to close device (ret %d).", ret);
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}
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DPRINT_EXIT(NETVSC_DRV);
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return ret;
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}
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/*++
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Name: netvsc_xmit_completion()
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Desc: Send completion processing
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--*/
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static void netvsc_xmit_completion(void *context)
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{
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struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context;
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struct sk_buff *skb = (struct sk_buff *)(unsigned long)packet->Completion.Send.SendCompletionTid;
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struct net_device* net;
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DPRINT_ENTER(NETVSC_DRV);
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kfree(packet);
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if (skb)
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{
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net = skb->dev;
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dev_kfree_skb_any(skb);
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if (netif_queue_stopped(net))
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{
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DPRINT_INFO(NETVSC_DRV, "net device (%p) waking up...", net);
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netif_wake_queue(net);
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}
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}
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DPRINT_EXIT(NETVSC_DRV);
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}
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/*++
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Name: netvsc_start_xmit()
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Desc: Start a send
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--*/
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static int netvsc_start_xmit (struct sk_buff *skb, struct net_device *net)
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{
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int ret=0;
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struct net_device_context *net_device_ctx = netdev_priv(net);
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struct driver_context *driver_ctx = driver_to_driver_context(net_device_ctx->device_ctx->device.driver);
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struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx;
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NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj;
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int i=0;
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struct hv_netvsc_packet *packet;
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int num_frags;
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int retries=0;
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DPRINT_ENTER(NETVSC_DRV);
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/* Support only 1 chain of frags */
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ASSERT(skb_shinfo(skb)->frag_list == NULL);
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ASSERT(skb->dev == net);
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DPRINT_DBG(NETVSC_DRV, "xmit packet - len %d data_len %d", skb->len, skb->data_len);
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/* Add 1 for skb->data and any additional ones requested */
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num_frags = skb_shinfo(skb)->nr_frags + 1 + net_drv_obj->AdditionalRequestPageBufferCount;
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/* Allocate a netvsc packet based on # of frags. */
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packet = kzalloc(sizeof(struct hv_netvsc_packet) + (num_frags * sizeof(PAGE_BUFFER)) + net_drv_obj->RequestExtSize, GFP_ATOMIC);
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if (!packet)
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{
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DPRINT_ERR(NETVSC_DRV, "unable to allocate hv_netvsc_packet");
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return -1;
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}
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packet->Extension = (void*)(unsigned long)packet + sizeof(struct hv_netvsc_packet) + (num_frags * sizeof(PAGE_BUFFER)) ;
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/* Setup the rndis header */
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packet->PageBufferCount = num_frags;
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/* TODO: Flush all write buffers/ memory fence ??? */
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/* wmb(); */
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/* Initialize it from the skb */
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ASSERT(skb->data);
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packet->TotalDataBufferLength = skb->len;
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/* Start filling in the page buffers starting at AdditionalRequestPageBufferCount offset */
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packet->PageBuffers[net_drv_obj->AdditionalRequestPageBufferCount].Pfn = virt_to_phys(skb->data) >> PAGE_SHIFT;
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packet->PageBuffers[net_drv_obj->AdditionalRequestPageBufferCount].Offset = (unsigned long)skb->data & (PAGE_SIZE -1);
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packet->PageBuffers[net_drv_obj->AdditionalRequestPageBufferCount].Length = skb->len - skb->data_len;
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ASSERT((skb->len - skb->data_len) <= PAGE_SIZE);
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for (i=net_drv_obj->AdditionalRequestPageBufferCount+1; i<num_frags; i++)
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{
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packet->PageBuffers[i].Pfn = page_to_pfn(skb_shinfo(skb)->frags[i-(net_drv_obj->AdditionalRequestPageBufferCount+1)].page);
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packet->PageBuffers[i].Offset = skb_shinfo(skb)->frags[i-(net_drv_obj->AdditionalRequestPageBufferCount+1)].page_offset;
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packet->PageBuffers[i].Length = skb_shinfo(skb)->frags[i-(net_drv_obj->AdditionalRequestPageBufferCount+1)].size;
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}
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/* Set the completion routine */
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packet->Completion.Send.OnSendCompletion = netvsc_xmit_completion;
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packet->Completion.Send.SendCompletionContext = packet;
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packet->Completion.Send.SendCompletionTid = (unsigned long)skb;
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retry_send:
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ret = net_drv_obj->OnSend(&net_device_ctx->device_ctx->device_obj, packet);
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if (ret == 0)
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{
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ret = NETDEV_TX_OK;
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net_device_ctx->stats.tx_bytes += skb->len;
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net_device_ctx->stats.tx_packets++;
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}
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else
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{
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retries++;
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if (retries < 4)
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{
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DPRINT_ERR(NETVSC_DRV, "unable to send...retrying %d...", retries);
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udelay(100);
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goto retry_send;
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}
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/* no more room or we are shutting down */
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DPRINT_ERR(NETVSC_DRV, "unable to send (%d)...marking net device (%p) busy", ret, net);
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DPRINT_INFO(NETVSC_DRV, "net device (%p) stopping", net);
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ret = NETDEV_TX_BUSY;
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net_device_ctx->stats.tx_dropped++;
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netif_stop_queue(net);
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/* Null it since the caller will free it instead of the completion routine */
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packet->Completion.Send.SendCompletionTid = 0;
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/* Release the resources since we will not get any send completion */
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netvsc_xmit_completion((void*)packet);
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}
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DPRINT_DBG(NETVSC_DRV, "# of xmits %lu total size %lu", net_device_ctx->stats.tx_packets, net_device_ctx->stats.tx_bytes);
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DPRINT_EXIT(NETVSC_DRV);
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return ret;
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}
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/*++
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Name: netvsc_linkstatus_callback()
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Desc: Link up/down notification
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--*/
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static void netvsc_linkstatus_callback(struct hv_device *device_obj, unsigned int status)
|
|
{
|
|
struct device_context* device_ctx = to_device_context(device_obj);
|
|
struct net_device* net = dev_get_drvdata(&device_ctx->device);
|
|
|
|
DPRINT_ENTER(NETVSC_DRV);
|
|
|
|
if (!net)
|
|
{
|
|
DPRINT_ERR(NETVSC_DRV, "got link status but net device not initialized yet");
|
|
return;
|
|
}
|
|
|
|
if (status == 1)
|
|
{
|
|
netif_carrier_on(net);
|
|
netif_wake_queue(net);
|
|
}
|
|
else
|
|
{
|
|
netif_carrier_off(net);
|
|
netif_stop_queue(net);
|
|
}
|
|
DPRINT_EXIT(NETVSC_DRV);
|
|
}
|
|
|
|
|
|
/*++
|
|
|
|
Name: netvsc_recv_callback()
|
|
|
|
Desc: Callback when we receive a packet from the "wire" on the specify device
|
|
|
|
--*/
|
|
static int netvsc_recv_callback(struct hv_device *device_obj, struct hv_netvsc_packet *packet)
|
|
{
|
|
int ret=0;
|
|
struct device_context *device_ctx = to_device_context(device_obj);
|
|
struct net_device *net = dev_get_drvdata(&device_ctx->device);
|
|
struct net_device_context *net_device_ctx;
|
|
|
|
struct sk_buff *skb;
|
|
void *data;
|
|
int i=0;
|
|
unsigned long flags;
|
|
|
|
DPRINT_ENTER(NETVSC_DRV);
|
|
|
|
if (!net)
|
|
{
|
|
DPRINT_ERR(NETVSC_DRV, "got receive callback but net device not initialized yet");
|
|
return 0;
|
|
}
|
|
|
|
net_device_ctx = netdev_priv(net);
|
|
|
|
/* Allocate a skb - TODO preallocate this */
|
|
/* skb = alloc_skb(packet->TotalDataBufferLength, GFP_ATOMIC); */
|
|
skb = dev_alloc_skb(packet->TotalDataBufferLength + 2); /* Pad 2-bytes to align IP header to 16 bytes */
|
|
ASSERT(skb);
|
|
skb_reserve(skb, 2);
|
|
skb->dev = net;
|
|
|
|
/* 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->PageBufferCount; i++)
|
|
{
|
|
data = kmap_atomic(pfn_to_page(packet->PageBuffers[i].Pfn), KM_IRQ1);
|
|
data = (void*)(unsigned long)data + packet->PageBuffers[i].Offset;
|
|
|
|
memcpy(skb_put(skb, packet->PageBuffers[i].Length), data, packet->PageBuffers[i].Length);
|
|
|
|
kunmap_atomic((void*)((unsigned long)data - packet->PageBuffers[i].Offset), KM_IRQ1);
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
|
|
skb->protocol = eth_type_trans(skb, net);
|
|
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
|
|
/* Pass the skb back up. Network stack will deallocate the skb when it is done */
|
|
ret = netif_rx(skb);
|
|
|
|
switch (ret)
|
|
{
|
|
case NET_RX_DROP:
|
|
net_device_ctx->stats.rx_dropped++;
|
|
break;
|
|
default:
|
|
net_device_ctx->stats.rx_packets++;
|
|
net_device_ctx->stats.rx_bytes += skb->len;
|
|
break;
|
|
|
|
}
|
|
DPRINT_DBG(NETVSC_DRV, "# of recvs %lu total size %lu", net_device_ctx->stats.rx_packets, net_device_ctx->stats.rx_bytes);
|
|
|
|
DPRINT_EXIT(NETVSC_DRV);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int netvsc_drv_exit_cb(struct device *dev, void *data)
|
|
{
|
|
struct device **curr = (struct device **)data;
|
|
*curr = dev;
|
|
return 1; /* stop iterating */
|
|
}
|
|
|
|
/*++
|
|
|
|
Name: netvsc_drv_exit()
|
|
|
|
Desc:
|
|
|
|
--*/
|
|
static void netvsc_drv_exit(void)
|
|
{
|
|
NETVSC_DRIVER_OBJECT *netvsc_drv_obj=&g_netvsc_drv.drv_obj;
|
|
struct driver_context *drv_ctx=&g_netvsc_drv.drv_ctx;
|
|
struct device *current_dev=NULL;
|
|
int ret;
|
|
|
|
DPRINT_ENTER(NETVSC_DRV);
|
|
|
|
while (1)
|
|
{
|
|
current_dev = NULL;
|
|
|
|
/* Get the device */
|
|
ret = driver_for_each_device(&drv_ctx->driver, NULL,
|
|
(void *) ¤t_dev,
|
|
netvsc_drv_exit_cb);
|
|
|
|
if (ret)
|
|
DPRINT_WARN(NETVSC_DRV,
|
|
"driver_for_each_device returned %d", ret);
|
|
|
|
|
|
if (current_dev == NULL)
|
|
break;
|
|
|
|
/* Initiate removal from the top-down */
|
|
DPRINT_INFO(NETVSC_DRV, "unregistering device (%p)...", current_dev);
|
|
|
|
device_unregister(current_dev);
|
|
}
|
|
|
|
if (netvsc_drv_obj->Base.OnCleanup)
|
|
netvsc_drv_obj->Base.OnCleanup(&netvsc_drv_obj->Base);
|
|
|
|
vmbus_child_driver_unregister(drv_ctx);
|
|
|
|
DPRINT_EXIT(NETVSC_DRV);
|
|
|
|
return;
|
|
}
|
|
|
|
static int __init netvsc_init(void)
|
|
{
|
|
int ret;
|
|
|
|
DPRINT_ENTER(NETVSC_DRV);
|
|
DPRINT_INFO(NETVSC_DRV, "Netvsc initializing....");
|
|
|
|
ret = netvsc_drv_init(NetVscInitialize);
|
|
|
|
DPRINT_EXIT(NETVSC_DRV);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit netvsc_exit(void)
|
|
{
|
|
DPRINT_ENTER(NETVSC_DRV);
|
|
|
|
netvsc_drv_exit();
|
|
|
|
DPRINT_EXIT(NETVSC_DRV);
|
|
}
|
|
|
|
module_param(netvsc_ringbuffer_size, int, S_IRUGO);
|
|
|
|
module_init(netvsc_init);
|
|
module_exit(netvsc_exit);
|