| /* |
| * 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> |
| */ |
| #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 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 = RndisFilterOnOpen(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); |