diff options
author | Hank Janssen <hjanssen@microsoft.com> | 2009-07-13 22:34:54 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-09-15 19:01:43 (GMT) |
commit | fceaf24a943d8d50391f409ac7fb888cd1f36f32 (patch) | |
tree | bbde5063f0208adcb283e29a922774b6ae85a604 /drivers/staging/hv/netvsc_drv.c | |
parent | f82bd0462f251ecbe13160a3f34bd48b5087666c (diff) | |
download | linux-fsl-qoriq-fceaf24a943d8d50391f409ac7fb888cd1f36f32.tar.xz |
Staging: hv: add the Hyper-V virtual network driver
This is the virtual network driver when running Linux on top of Hyper-V.
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging/hv/netvsc_drv.c')
-rw-r--r-- | drivers/staging/hv/netvsc_drv.c | 720 |
1 files changed, 720 insertions, 0 deletions
diff --git a/drivers/staging/hv/netvsc_drv.c b/drivers/staging/hv/netvsc_drv.c new file mode 100644 index 0000000..1b3174a --- /dev/null +++ b/drivers/staging/hv/netvsc_drv.c @@ -0,0 +1,720 @@ +/* + * + * 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: + * Hank Janssen <hjanssen@microsoft.com> + * + */ + + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/highmem.h> +#include <linux/device.h> +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) +#include <asm/io.h> +#else +#include <linux/io.h> +#endif +#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 <net/arp.h> +#include <net/route.h> +#include <net/sock.h> +#include <net/pkt_sched.h> + +#include "logging.h" +#include "vmbus.h" + +#include "NetVscApi.h" + +MODULE_LICENSE("GPL"); + +// +// Static decl +// +static int netvsc_probe(struct device *device); +static int netvsc_remove(struct device *device); +static int netvsc_open(struct net_device *net); +static void netvsc_xmit_completion(void *context); +static int netvsc_start_xmit (struct sk_buff *skb, struct net_device *net); +static int netvsc_recv_callback(DEVICE_OBJECT *device_obj, NETVSC_PACKET* Packet); +static int netvsc_close(struct net_device *net); +static struct net_device_stats *netvsc_get_stats(struct net_device *net); +static void netvsc_linkstatus_callback(DEVICE_OBJECT *device_obj, unsigned int status); + +// +// Data types +// +struct net_device_context { + struct device_context *device_ctx; // point back to our device context + struct net_device_stats stats; +}; + +struct netvsc_driver_context { + // !! These must be the first 2 fields !! + struct driver_context drv_ctx; + NETVSC_DRIVER_OBJECT drv_obj; +}; + +// +// Globals +// + +static int netvsc_ringbuffer_size = NETVSC_DEVICE_RING_BUFFER_SIZE; + +// The one and only one +static struct netvsc_driver_context g_netvsc_drv; + +// +// Routines +// + +/*++ + +Name: netvsc_drv_init() + +Desc: NetVsc driver initialization + +--*/ +int netvsc_drv_init(PFN_DRIVERINITIALIZE pfn_drv_init) +{ + int ret=0; + NETVSC_DRIVER_OBJECT *net_drv_obj=&g_netvsc_drv.drv_obj; + struct driver_context *drv_ctx=&g_netvsc_drv.drv_ctx; + + DPRINT_ENTER(NETVSC_DRV); + + vmbus_get_interface(&net_drv_obj->Base.VmbusChannelInterface); + + net_drv_obj->RingBufferSize = netvsc_ringbuffer_size; + net_drv_obj->OnReceiveCallback = netvsc_recv_callback; + net_drv_obj->OnLinkStatusChanged = netvsc_linkstatus_callback; + + // Callback to client driver to complete the initialization + pfn_drv_init(&net_drv_obj->Base); + + drv_ctx->driver.name = net_drv_obj->Base.name; + memcpy(&drv_ctx->class_id, &net_drv_obj->Base.deviceType, sizeof(GUID)); + +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) + drv_ctx->driver.probe = netvsc_probe; + drv_ctx->driver.remove = netvsc_remove; +#else + drv_ctx->probe = netvsc_probe; + drv_ctx->remove = netvsc_remove; +#endif + + // The driver belongs to vmbus + vmbus_child_driver_register(drv_ctx); + + DPRINT_EXIT(NETVSC_DRV); + + return ret; +} + +/*++ + +Name: netvsc_get_stats() + +Desc: Get the network stats + +--*/ +static struct net_device_stats *netvsc_get_stats(struct net_device *net) +{ + struct net_device_context *net_device_ctx = netdev_priv(net); + + return &net_device_ctx->stats; +} + +/*++ + +Name: netvsc_set_multicast_list() + +Desc: Set the multicast list + +Remark: No-op here +--*/ +static void netvsc_set_multicast_list(UNUSED_VAR(struct net_device *net)) +{ +} + + +/*++ + +Name: netvsc_probe() + +Desc: Add the specified new device to this driver + +--*/ +static int netvsc_probe(struct device *device) +{ + int ret=0; + + struct driver_context *driver_ctx = driver_to_driver_context(device->driver); + struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx; + NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj; + + struct device_context *device_ctx = device_to_device_context(device); + DEVICE_OBJECT *device_obj = &device_ctx->device_obj; + + struct net_device *net = NULL; + struct net_device_context *net_device_ctx; + NETVSC_DEVICE_INFO device_info; + + DPRINT_ENTER(NETVSC_DRV); + + if (!net_drv_obj->Base.OnDeviceAdd) + { + return -1; + } + + net = alloc_netdev(sizeof(struct net_device_context), "seth%d", ether_setup); + //net = alloc_etherdev(sizeof(struct net_device_context)); + if (!net) + { + return -1; + } + + // Set initial state + netif_carrier_off(net); + netif_stop_queue(net); + + net_device_ctx = netdev_priv(net); + net_device_ctx->device_ctx = device_ctx; + device->driver_data = net; + + // Notify the netvsc driver of the new device + ret = net_drv_obj->Base.OnDeviceAdd(device_obj, (void*)&device_info); + if (ret != 0) + { + free_netdev(net); + device->driver_data = NULL; + + DPRINT_ERR(NETVSC_DRV, "unable to add netvsc device (ret %d)", 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.LinkState) + { + netif_carrier_on(net); + } + } + + memcpy(net->dev_addr, device_info.MacAddr, ETH_ALEN); + + net->open = netvsc_open; + net->hard_start_xmit = netvsc_start_xmit; + net->stop = netvsc_close; + net->get_stats = netvsc_get_stats; + net->set_multicast_list = netvsc_set_multicast_list; + +#if !defined(KERNEL_2_6_27) + SET_MODULE_OWNER(net); +#endif + SET_NETDEV_DEV(net, device); + + ret = register_netdev(net); + if (ret != 0) + { + // Remove the device and release the resource + net_drv_obj->Base.OnDeviceRemove(device_obj); + free_netdev(net); + } + + DPRINT_EXIT(NETVSC_DRV); + + return ret; +} + +static int netvsc_remove(struct device *device) +{ + int ret=0; + struct driver_context *driver_ctx = driver_to_driver_context(device->driver); + struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx; + NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj; + + struct device_context *device_ctx = device_to_device_context(device); + struct net_device *net = (struct net_device *)device_ctx->device.driver_data; + DEVICE_OBJECT *device_obj = &device_ctx->device_obj; + + DPRINT_ENTER(NETVSC_DRV); + + if (net == NULL) + { + DPRINT_INFO(NETVSC, "no net device to remove"); + DPRINT_EXIT(NETVSC_DRV); + return 0; + } + + if (!net_drv_obj->Base.OnDeviceRemove) + { + DPRINT_EXIT(NETVSC_DRV); + return -1; + } + + // 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 = net_drv_obj->Base.OnDeviceRemove(device_obj); + if (ret != 0) + { + // TODO: + DPRINT_ERR(NETVSC, "unable to remove vsc device (ret %d)", ret); + } + + free_netdev(net); + + DPRINT_EXIT(NETVSC_DRV); + + return ret; +} + +/*++ + +Name: netvsc_open() + +Desc: Open the specified interface device + +--*/ +static int netvsc_open(struct net_device *net) +{ + int ret=0; + struct net_device_context *net_device_ctx = netdev_priv(net); + struct driver_context *driver_ctx = driver_to_driver_context(net_device_ctx->device_ctx->device.driver); + struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx; + NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj; + + DEVICE_OBJECT *device_obj = &net_device_ctx->device_ctx->device_obj; + + DPRINT_ENTER(NETVSC_DRV); + + if (netif_carrier_ok(net)) + { + memset(&net_device_ctx->stats, 0 , sizeof(struct net_device_stats)); + + // Open up the device + ret = net_drv_obj->OnOpen(device_obj); + if (ret != 0) + { + DPRINT_ERR(NETVSC_DRV, "unable to open device (ret %d).", ret); + return ret; + } + + netif_start_queue(net); + } + else + { + DPRINT_ERR(NETVSC_DRV, "unable to open device...link is down."); + } + + DPRINT_EXIT(NETVSC_DRV); + return ret; +} + +/*++ + +Name: netvsc_close() + +Desc: Close the specified interface device + +--*/ +static int netvsc_close(struct net_device *net) +{ + int ret=0; + struct net_device_context *net_device_ctx = netdev_priv(net); + struct driver_context *driver_ctx = driver_to_driver_context(net_device_ctx->device_ctx->device.driver); + struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx; + NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj; + + DEVICE_OBJECT *device_obj = &net_device_ctx->device_ctx->device_obj; + + DPRINT_ENTER(NETVSC_DRV); + + netif_stop_queue(net); + + ret = net_drv_obj->OnClose(device_obj); + if (ret != 0) + { + DPRINT_ERR(NETVSC_DRV, "unable to close device (ret %d).", ret); + } + + DPRINT_EXIT(NETVSC_DRV); + + return ret; +} + + +/*++ + +Name: netvsc_xmit_completion() + +Desc: Send completion processing + +--*/ +static void netvsc_xmit_completion(void *context) +{ + NETVSC_PACKET *packet = (NETVSC_PACKET *)context; + struct sk_buff *skb = (struct sk_buff *)(ULONG_PTR)packet->Completion.Send.SendCompletionTid; + struct net_device* net; + + DPRINT_ENTER(NETVSC_DRV); + + kfree(packet); + + if (skb) + { + net = skb->dev; + + dev_kfree_skb_any(skb); + + if (netif_queue_stopped(net)) + { + DPRINT_INFO(NETVSC_DRV, "net device (%p) waking up...", net); + + netif_wake_queue(net); + } + } + + DPRINT_EXIT(NETVSC_DRV); +} + +/*++ + +Name: netvsc_start_xmit() + +Desc: Start a send + +--*/ +static int netvsc_start_xmit (struct sk_buff *skb, struct net_device *net) +{ + int ret=0; + struct net_device_context *net_device_ctx = netdev_priv(net); + struct driver_context *driver_ctx = driver_to_driver_context(net_device_ctx->device_ctx->device.driver); + struct netvsc_driver_context *net_drv_ctx = (struct netvsc_driver_context*)driver_ctx; + NETVSC_DRIVER_OBJECT *net_drv_obj = &net_drv_ctx->drv_obj; + + int i=0; + NETVSC_PACKET* packet; + int num_frags; + int retries=0; + + DPRINT_ENTER(NETVSC_DRV); + + // Support only 1 chain of frags + ASSERT(skb_shinfo(skb)->frag_list == NULL); + ASSERT(skb->dev == net); + + DPRINT_DBG(NETVSC_DRV, "xmit packet - len %d data_len %d", skb->len, skb->data_len); + + // Add 1 for skb->data and any additional ones requested + num_frags = skb_shinfo(skb)->nr_frags + 1 + net_drv_obj->AdditionalRequestPageBufferCount; + + // Allocate a netvsc packet based on # of frags. + packet = kzalloc(sizeof(NETVSC_PACKET) + (num_frags * sizeof(PAGE_BUFFER)) + net_drv_obj->RequestExtSize, GFP_ATOMIC); + if (!packet) + { + DPRINT_ERR(NETVSC_DRV, "unable to allocate NETVSC_PACKET"); + return -1; + } + + packet->Extension = (void*)(unsigned long)packet + sizeof(NETVSC_PACKET) + (num_frags * sizeof(PAGE_BUFFER)) ; + + // Setup the rndis header + packet->PageBufferCount = num_frags; + + // TODO: Flush all write buffers/ memory fence ??? + //wmb(); + + // Initialize it from the skb + ASSERT(skb->data); + packet->TotalDataBufferLength = skb->len; + + // Start filling in the page buffers starting at AdditionalRequestPageBufferCount offset + packet->PageBuffers[net_drv_obj->AdditionalRequestPageBufferCount].Pfn = virt_to_phys(skb->data) >> PAGE_SHIFT; + packet->PageBuffers[net_drv_obj->AdditionalRequestPageBufferCount].Offset = (unsigned long)skb->data & (PAGE_SIZE -1); + packet->PageBuffers[net_drv_obj->AdditionalRequestPageBufferCount].Length = skb->len - skb->data_len; + + ASSERT((skb->len - skb->data_len) <= PAGE_SIZE); + + for (i=net_drv_obj->AdditionalRequestPageBufferCount+1; i<num_frags; i++) + { + packet->PageBuffers[i].Pfn = page_to_pfn(skb_shinfo(skb)->frags[i-(net_drv_obj->AdditionalRequestPageBufferCount+1)].page); + packet->PageBuffers[i].Offset = skb_shinfo(skb)->frags[i-(net_drv_obj->AdditionalRequestPageBufferCount+1)].page_offset; + packet->PageBuffers[i].Length = skb_shinfo(skb)->frags[i-(net_drv_obj->AdditionalRequestPageBufferCount+1)].size; + } + + // Set the completion routine + packet->Completion.Send.OnSendCompletion = netvsc_xmit_completion; + packet->Completion.Send.SendCompletionContext = packet; + packet->Completion.Send.SendCompletionTid = (ULONG_PTR)skb; + +retry_send: + ret = net_drv_obj->OnSend(&net_device_ctx->device_ctx->device_obj, packet); + + if (ret == 0) + { +#ifdef KERNEL_2_6_5 +#define NETDEV_TX_OK 0 +#define NETDEV_TX_BUSY 0 +#endif + ret = NETDEV_TX_OK; + net_device_ctx->stats.tx_bytes += skb->len; + net_device_ctx->stats.tx_packets++; + } + else + { + retries++; + if (retries < 4) + { + DPRINT_ERR(NETVSC_DRV, "unable to send...retrying %d...", retries); + udelay(100); + goto retry_send; + } + + // no more room or we are shutting down + DPRINT_ERR(NETVSC_DRV, "unable to send (%d)...marking net device (%p) busy", ret, net); + DPRINT_INFO(NETVSC_DRV, "net device (%p) stopping", net); + + ret = NETDEV_TX_BUSY; + net_device_ctx->stats.tx_dropped++; + + netif_stop_queue(net); + + // Null it since the caller will free it instead of the completion routine + packet->Completion.Send.SendCompletionTid = 0; + + // Release the resources since we will not get any send completion + netvsc_xmit_completion((void*)packet); + } + + DPRINT_DBG(NETVSC_DRV, "# of xmits %lu total size %lu", net_device_ctx->stats.tx_packets, net_device_ctx->stats.tx_bytes); + + DPRINT_EXIT(NETVSC_DRV); + return ret; +} + + +/*++ + +Name: netvsc_linkstatus_callback() + +Desc: Link up/down notification + +--*/ +static void netvsc_linkstatus_callback(DEVICE_OBJECT *device_obj, unsigned int status) +{ + struct device_context* device_ctx = to_device_context(device_obj); + struct net_device* net = (struct net_device *)device_ctx->device.driver_data; + + 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(DEVICE_OBJECT *device_obj, NETVSC_PACKET* packet) +{ + int ret=0; + struct device_context *device_ctx = to_device_context(device_obj); + struct net_device *net = (struct net_device *)device_ctx->device.driver_data; + 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 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: + +--*/ +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; +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9) +#define driver_for_each_device(drv, start, data, fn) \ + struct list_head *ptr, *n; \ + list_for_each_safe(ptr, n, &((drv)->devices)) {\ + struct device *curr_dev;\ + curr_dev = list_entry(ptr, struct device, driver_list);\ + fn(curr_dev, data);\ + } +#endif + + DPRINT_ENTER(NETVSC_DRV); + + while (1) + { + current_dev = NULL; + + // Get the device + driver_for_each_device(&drv_ctx->driver, NULL, (void*)¤t_dev, netvsc_drv_exit_cb); + + 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); |