diff options
Diffstat (limited to 'drivers/net/hyperv/netvsc_drv.c')
| -rw-r--r-- | drivers/net/hyperv/netvsc_drv.c | 508 |
1 files changed, 508 insertions, 0 deletions
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c new file mode 100644 index 00000000000..462d05f05e8 --- /dev/null +++ b/drivers/net/hyperv/netvsc_drv.c @@ -0,0 +1,508 @@ +/* + * 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/atomic.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 <net/arp.h> +#include <net/route.h> +#include <net/sock.h> +#include <net/pkt_sched.h> + +#include "hyperv_net.h" + +struct net_device_context { + /* point back to our device context */ + struct hv_device *device_ctx; + struct delayed_work dwork; +}; + + +static int ring_size = 128; +module_param(ring_size, int, S_IRUGO); +MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)"); + +struct set_multicast_work { + struct work_struct work; + struct net_device *net; +}; + +static void do_set_multicast(struct work_struct *w) +{ + struct set_multicast_work *swk = + container_of(w, struct set_multicast_work, work); + struct net_device *net = swk->net; + + struct net_device_context *ndevctx = netdev_priv(net); + struct netvsc_device *nvdev; + struct rndis_device *rdev; + + nvdev = hv_get_drvdata(ndevctx->device_ctx); + if (nvdev == NULL) + return; + + rdev = nvdev->extension; + if (rdev == NULL) + return; + + if (net->flags & IFF_PROMISC) + rndis_filter_set_packet_filter(rdev, + NDIS_PACKET_TYPE_PROMISCUOUS); + else + rndis_filter_set_packet_filter(rdev, + NDIS_PACKET_TYPE_BROADCAST | + NDIS_PACKET_TYPE_ALL_MULTICAST | + NDIS_PACKET_TYPE_DIRECTED); + + kfree(w); +} + +static void netvsc_set_multicast_list(struct net_device *net) +{ + struct set_multicast_work *swk = + kmalloc(sizeof(struct set_multicast_work), GFP_ATOMIC); + if (swk == NULL) + return; + + swk->net = net; + INIT_WORK(&swk->work, do_set_multicast); + schedule_work(&swk->work); +} + +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; + + /* 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); + + 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) + dev_kfree_skb_any(skb); +} + +static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net) +{ + struct net_device_context *net_device_ctx = netdev_priv(net); + struct hv_netvsc_packet *packet; + int ret; + unsigned int i, num_pages, npg_data; + + /* Add multipage for skb->data and additional one for RNDIS */ + npg_data = (((unsigned long)skb->data + skb_headlen(skb) - 1) + >> PAGE_SHIFT) - ((unsigned long)skb->data >> PAGE_SHIFT) + 1; + num_pages = skb_shinfo(skb)->nr_frags + npg_data + 1; + + /* Allocate a netvsc packet based on # of frags. */ + packet = kzalloc(sizeof(struct hv_netvsc_packet) + + (num_pages * sizeof(struct hv_page_buffer)) + + sizeof(struct rndis_filter_packet), GFP_ATOMIC); + if (!packet) { + /* out of memory, drop packet */ + netdev_err(net, "unable to allocate hv_netvsc_packet\n"); + + dev_kfree_skb(skb); + net->stats.tx_dropped++; + return NETDEV_TX_BUSY; + } + + 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; + + /* 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); + if (npg_data == 1) + packet->page_buf[1].len = skb_headlen(skb); + else + packet->page_buf[1].len = PAGE_SIZE + - packet->page_buf[1].offset; + + for (i = 2; i <= npg_data; i++) { + packet->page_buf[i].pfn = virt_to_phys(skb->data + + PAGE_SIZE * (i-1)) >> PAGE_SHIFT; + packet->page_buf[i].offset = 0; + packet->page_buf[i].len = PAGE_SIZE; + } + if (npg_data > 1) + packet->page_buf[npg_data].len = (((unsigned long)skb->data + + skb_headlen(skb) - 1) & (PAGE_SIZE - 1)) + 1; + + /* Additional fragments are after SKB data */ + for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { + const skb_frag_t *f = &skb_shinfo(skb)->frags[i]; + + packet->page_buf[i+npg_data+1].pfn = + page_to_pfn(skb_frag_page(f)); + packet->page_buf[i+npg_data+1].offset = f->page_offset; + packet->page_buf[i+npg_data+1].len = skb_frag_size(f); + } + + /* 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 = rndis_filter_send(net_device_ctx->device_ctx, + packet); + if (ret == 0) { + net->stats.tx_bytes += skb->len; + net->stats.tx_packets++; + } else { + /* we are shutting down or bus overloaded, just drop packet */ + net->stats.tx_dropped++; + kfree(packet); + dev_kfree_skb_any(skb); + } + + return ret ? NETDEV_TX_BUSY : NETDEV_TX_OK; +} + +/* + * netvsc_linkstatus_callback - Link up/down notification + */ +void netvsc_linkstatus_callback(struct hv_device *device_obj, + unsigned int status) +{ + struct net_device *net; + struct net_device_context *ndev_ctx; + struct netvsc_device *net_device; + + net_device = hv_get_drvdata(device_obj); + net = net_device->ndev; + + 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); + ndev_ctx = netdev_priv(net); + schedule_delayed_work(&ndev_ctx->dwork, 0); + schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20)); + } 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. + */ +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; + struct netvsc_device *net_device; + + net_device = hv_get_drvdata(device_obj); + net = net_device->ndev; + + 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; + } + + /* + * Copy to skb. This copy is needed here since the memory pointed by + * hv_netvsc_packet cannot be deallocated + */ + memcpy(skb_put(skb, packet->total_data_buflen), packet->data, + packet->total_data_buflen); + + 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 int netvsc_change_mtu(struct net_device *ndev, int mtu) +{ + struct net_device_context *ndevctx = netdev_priv(ndev); + struct hv_device *hdev = ndevctx->device_ctx; + struct netvsc_device *nvdev = hv_get_drvdata(hdev); + struct netvsc_device_info device_info; + int limit = ETH_DATA_LEN; + + if (nvdev == NULL || nvdev->destroy) + return -ENODEV; + + if (nvdev->nvsp_version == NVSP_PROTOCOL_VERSION_2) + limit = NETVSC_MTU; + + if (mtu < 68 || mtu > limit) + return -EINVAL; + + nvdev->start_remove = true; + cancel_delayed_work_sync(&ndevctx->dwork); + netif_stop_queue(ndev); + rndis_filter_device_remove(hdev); + + ndev->mtu = mtu; + + ndevctx->device_ctx = hdev; + hv_set_drvdata(hdev, ndev); + device_info.ring_size = ring_size; + rndis_filter_device_add(hdev, &device_info); + netif_wake_queue(ndev); + + return 0; +} + +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_rx_mode = netvsc_set_multicast_list, + .ndo_change_mtu = netvsc_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 delayed 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; + struct netvsc_device *net_device; + + ndev_ctx = container_of(w, struct net_device_context, dwork.work); + net_device = hv_get_drvdata(ndev_ctx->device_ctx); + net = net_device->ndev; + netif_notify_peers(net); +} + + +static int netvsc_probe(struct hv_device *dev, + const struct hv_vmbus_device_id *dev_id) +{ + 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 -ENOMEM; + + /* Set initial state */ + netif_carrier_off(net); + + net_device_ctx = netdev_priv(net); + net_device_ctx->device_ctx = dev; + hv_set_drvdata(dev, net); + INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_send_garp); + + 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) { + pr_err("Unable to register netdev.\n"); + free_netdev(net); + goto out; + } + + /* Notify the netvsc driver of the new device */ + device_info.ring_size = ring_size; + ret = rndis_filter_device_add(dev, &device_info); + if (ret != 0) { + netdev_err(net, "unable to add netvsc device (ret %d)\n", ret); + unregister_netdev(net); + free_netdev(net); + hv_set_drvdata(dev, NULL); + return ret; + } + memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN); + + netif_carrier_on(net); + +out: + return ret; +} + +static int netvsc_remove(struct hv_device *dev) +{ + struct net_device *net; + struct net_device_context *ndev_ctx; + struct netvsc_device *net_device; + + net_device = hv_get_drvdata(dev); + net = net_device->ndev; + + if (net == NULL) { + dev_err(&dev->device, "No net device to remove\n"); + return 0; + } + + net_device->start_remove = true; + + ndev_ctx = netdev_priv(net); + cancel_delayed_work_sync(&ndev_ctx->dwork); + + /* Stop outbound asap */ + netif_stop_queue(net); + + unregister_netdev(net); + + /* + * Call to the vsc driver to let it know that the device is being + * removed + */ + rndis_filter_device_remove(dev); + + free_netdev(net); + return 0; +} + +static const struct hv_vmbus_device_id id_table[] = { + /* Network guid */ + { VMBUS_DEVICE(0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46, + 0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E) }, + { }, +}; + +MODULE_DEVICE_TABLE(vmbus, id_table); + +/* The one and only one */ +static struct hv_driver netvsc_drv = { + .name = "netvsc", + .id_table = id_table, + .probe = netvsc_probe, + .remove = netvsc_remove, +}; + +static void __exit netvsc_drv_exit(void) +{ + vmbus_driver_unregister(&netvsc_drv); +} + +static int __init netvsc_drv_init(void) +{ + return vmbus_driver_register(&netvsc_drv); +} + +MODULE_LICENSE("GPL"); +MODULE_VERSION(HV_DRV_VERSION); +MODULE_DESCRIPTION("Microsoft Hyper-V network driver"); + +module_init(netvsc_drv_init); +module_exit(netvsc_drv_exit); |