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path: root/drivers/net/hyperv/netvsc_drv.c
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Diffstat (limited to 'drivers/net/hyperv/netvsc_drv.c')
-rw-r--r--drivers/net/hyperv/netvsc_drv.c509
1 files changed, 509 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..1a1ca6cfc74
--- /dev/null
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -0,0 +1,509 @@
+/*
+ * 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)
+ goto out;
+
+ rdev = nvdev->extension;
+ if (rdev == NULL)
+ goto out;
+
+ 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);
+
+out:
+ 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, &ethtool_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);