diff options
Diffstat (limited to 'drivers/staging/hv/netvsc_drv.c')
-rw-r--r-- | drivers/staging/hv/netvsc_drv.c | 618 |
1 files changed, 618 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..3192d50 --- /dev/null +++ b/drivers/staging/hv/netvsc_drv.c @@ -0,0 +1,618 @@ +/* + * 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> +#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 <net/arp.h> +#include <net/route.h> +#include <net/sock.h> +#include <net/pkt_sched.h> +#include "osd.h" +#include "logging.h" +#include "vmbus.h" +#include "NetVscApi.h" + +MODULE_LICENSE("GPL"); + +struct net_device_context { + /* point back to our device context */ + struct device_context *device_ctx; + struct net_device_stats stats; +}; + +struct netvsc_driver_context { + /* !! These must be the first 2 fields !! */ + /* Which is a bug FIXME! */ + struct driver_context drv_ctx; + struct netvsc_driver drv_obj; +}; + +static int netvsc_ringbuffer_size = NETVSC_DEVICE_RING_BUFFER_SIZE; + +/* The one and only one */ +static struct netvsc_driver_context g_netvsc_drv; + +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; +} + +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 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; + struct netvsc_driver *net_drv_obj = &net_drv_ctx->drv_obj; + struct hv_device *device_obj = &net_device_ctx->device_ctx->device_obj; + int ret = 0; + + 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; +} + +static int netvsc_close(struct net_device *net) +{ + 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; + struct netvsc_driver *net_drv_obj = &net_drv_ctx->drv_obj; + struct hv_device *device_obj = &net_device_ctx->device_ctx->device_obj; + int ret; + + 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; +} + +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.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); +} + +static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net) +{ + 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; + struct netvsc_driver *net_drv_obj = &net_drv_ctx->drv_obj; + struct hv_netvsc_packet *packet; + int i; + int ret; + 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(struct hv_netvsc_packet) + + (num_frags * sizeof(struct hv_page_buffer)) + + net_drv_obj->RequestExtSize, GFP_ATOMIC); + if (!packet) { + DPRINT_ERR(NETVSC_DRV, "unable to allocate hv_netvsc_packet"); + return -1; + } + + packet->Extension = (void *)(unsigned long)packet + + sizeof(struct hv_netvsc_packet) + + (num_frags * sizeof(struct hv_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 = (unsigned long)skb; + +retry_send: + ret = net_drv_obj->OnSend(&net_device_ctx->device_ctx->device_obj, + packet); + + if (ret == 0) { + 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; +} + +/** + * netvsc_linkstatus_callback - Link up/down notification + */ +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); +} + +/** + * 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 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 ret; + int i; + 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 */ + /* Pad 2-bytes to align IP header to 16 bytes */ + skb = dev_alloc_skb(packet->TotalDataBufferLength + 2); + 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 const struct net_device_ops device_ops = { + .ndo_open = netvsc_open, + .ndo_stop = netvsc_close, + .ndo_start_xmit = netvsc_start_xmit, + .ndo_get_stats = netvsc_get_stats, + .ndo_set_multicast_list = netvsc_set_multicast_list, +}; + +static int netvsc_probe(struct device *device) +{ + struct driver_context *driver_ctx = + driver_to_driver_context(device->driver); + struct netvsc_driver_context *net_drv_ctx = + (struct netvsc_driver_context *)driver_ctx; + struct netvsc_driver *net_drv_obj = &net_drv_ctx->drv_obj; + struct device_context *device_ctx = device_to_device_context(device); + struct hv_device *device_obj = &device_ctx->device_obj; + struct net_device *net = NULL; + struct net_device_context *net_device_ctx; + struct netvsc_device_info device_info; + int ret; + + DPRINT_ENTER(NETVSC_DRV); + + if (!net_drv_obj->Base.OnDeviceAdd) + return -1; + + net = alloc_netdev(sizeof(struct net_device_context), "seth%d", + ether_setup); + 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; + dev_set_drvdata(device, net); + + /* Notify the netvsc driver of the new device */ + ret = net_drv_obj->Base.OnDeviceAdd(device_obj, &device_info); + if (ret != 0) { + free_netdev(net); + dev_set_drvdata(device, 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->netdev_ops = &device_ops; + + 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) +{ + struct driver_context *driver_ctx = + driver_to_driver_context(device->driver); + struct netvsc_driver_context *net_drv_ctx = + (struct netvsc_driver_context *)driver_ctx; + struct netvsc_driver *net_drv_obj = &net_drv_ctx->drv_obj; + struct device_context *device_ctx = device_to_device_context(device); + struct net_device *net = dev_get_drvdata(&device_ctx->device); + struct hv_device *device_obj = &device_ctx->device_obj; + int ret; + + 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; +} + +static int netvsc_drv_exit_cb(struct device *dev, void *data) +{ + struct device **curr = (struct device **)data; + + *curr = dev; + /* stop iterating */ + return 1; +} + +static void netvsc_drv_exit(void) +{ + struct netvsc_driver *netvsc_drv_obj = &g_netvsc_drv.drv_obj; + struct driver_context *drv_ctx = &g_netvsc_drv.drv_ctx; + struct device *current_dev; + int ret; + + DPRINT_ENTER(NETVSC_DRV); + + while (1) { + current_dev = NULL; + + /* Get the device */ + ret = driver_for_each_device(&drv_ctx->driver, NULL, + ¤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 netvsc_drv_init(int (*drv_init)(struct hv_driver *drv)) +{ + struct netvsc_driver *net_drv_obj = &g_netvsc_drv.drv_obj; + struct driver_context *drv_ctx = &g_netvsc_drv.drv_ctx; + int ret; + + 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 */ + 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(struct hv_guid)); + + drv_ctx->probe = netvsc_probe; + drv_ctx->remove = netvsc_remove; + + /* The driver belongs to vmbus */ + ret = vmbus_child_driver_register(drv_ctx); + + DPRINT_EXIT(NETVSC_DRV); + + return ret; +} + +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); |