![Haiyang Zhang](/assets/img/avatar_default.png)
With this feature, a Linux guest can now configure multiple vlans through a single synthetic NIC on Win8 Hyper-V host. Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
934 lines
25 KiB
C
934 lines
25 KiB
C
/*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/netdevice.h>
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#include <linux/if_ether.h>
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#include "hyperv_net.h"
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static struct netvsc_device *alloc_net_device(struct hv_device *device)
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{
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struct netvsc_device *net_device;
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struct net_device *ndev = hv_get_drvdata(device);
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net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
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if (!net_device)
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return NULL;
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net_device->start_remove = false;
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net_device->destroy = false;
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net_device->dev = device;
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net_device->ndev = ndev;
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hv_set_drvdata(device, net_device);
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return net_device;
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}
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static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
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{
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struct netvsc_device *net_device;
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net_device = hv_get_drvdata(device);
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if (net_device && net_device->destroy)
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net_device = NULL;
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return net_device;
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}
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static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
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{
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struct netvsc_device *net_device;
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net_device = hv_get_drvdata(device);
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if (!net_device)
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goto get_in_err;
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if (net_device->destroy &&
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atomic_read(&net_device->num_outstanding_sends) == 0)
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net_device = NULL;
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get_in_err:
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return net_device;
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}
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static int netvsc_destroy_recv_buf(struct netvsc_device *net_device)
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{
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struct nvsp_message *revoke_packet;
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int ret = 0;
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struct net_device *ndev = net_device->ndev;
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/*
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* If we got a section count, it means we received a
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* SendReceiveBufferComplete msg (ie sent
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* NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
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* to send a revoke msg here
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*/
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if (net_device->recv_section_cnt) {
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/* Send the revoke receive buffer */
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revoke_packet = &net_device->revoke_packet;
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memset(revoke_packet, 0, sizeof(struct nvsp_message));
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revoke_packet->hdr.msg_type =
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NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
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revoke_packet->msg.v1_msg.
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revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
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ret = vmbus_sendpacket(net_device->dev->channel,
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revoke_packet,
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sizeof(struct nvsp_message),
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(unsigned long)revoke_packet,
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VM_PKT_DATA_INBAND, 0);
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/*
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* If we failed here, we might as well return and
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* have a leak rather than continue and a bugchk
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*/
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if (ret != 0) {
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netdev_err(ndev, "unable to send "
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"revoke receive buffer to netvsp\n");
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return ret;
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}
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}
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/* Teardown the gpadl on the vsp end */
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if (net_device->recv_buf_gpadl_handle) {
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ret = vmbus_teardown_gpadl(net_device->dev->channel,
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net_device->recv_buf_gpadl_handle);
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/* If we failed here, we might as well return and have a leak
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* rather than continue and a bugchk
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*/
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if (ret != 0) {
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netdev_err(ndev,
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"unable to teardown receive buffer's gpadl\n");
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return ret;
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}
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net_device->recv_buf_gpadl_handle = 0;
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}
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if (net_device->recv_buf) {
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/* Free up the receive buffer */
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free_pages((unsigned long)net_device->recv_buf,
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get_order(net_device->recv_buf_size));
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net_device->recv_buf = NULL;
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}
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if (net_device->recv_section) {
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net_device->recv_section_cnt = 0;
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kfree(net_device->recv_section);
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net_device->recv_section = NULL;
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}
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return ret;
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}
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static int netvsc_init_recv_buf(struct hv_device *device)
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{
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int ret = 0;
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int t;
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struct netvsc_device *net_device;
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struct nvsp_message *init_packet;
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struct net_device *ndev;
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net_device = get_outbound_net_device(device);
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if (!net_device)
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return -ENODEV;
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ndev = net_device->ndev;
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net_device->recv_buf =
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(void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
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get_order(net_device->recv_buf_size));
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if (!net_device->recv_buf) {
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netdev_err(ndev, "unable to allocate receive "
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"buffer of size %d\n", net_device->recv_buf_size);
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ret = -ENOMEM;
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goto cleanup;
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}
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/*
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* Establish the gpadl handle for this buffer on this
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* channel. Note: This call uses the vmbus connection rather
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* than the channel to establish the gpadl handle.
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*/
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ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
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net_device->recv_buf_size,
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&net_device->recv_buf_gpadl_handle);
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if (ret != 0) {
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netdev_err(ndev,
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"unable to establish receive buffer's gpadl\n");
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goto cleanup;
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}
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/* Notify the NetVsp of the gpadl handle */
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init_packet = &net_device->channel_init_pkt;
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memset(init_packet, 0, sizeof(struct nvsp_message));
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init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
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init_packet->msg.v1_msg.send_recv_buf.
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gpadl_handle = net_device->recv_buf_gpadl_handle;
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init_packet->msg.v1_msg.
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send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
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/* Send the gpadl notification request */
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ret = vmbus_sendpacket(device->channel, init_packet,
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sizeof(struct nvsp_message),
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(unsigned long)init_packet,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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if (ret != 0) {
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netdev_err(ndev,
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"unable to send receive buffer's gpadl to netvsp\n");
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goto cleanup;
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}
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t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
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BUG_ON(t == 0);
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/* Check the response */
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if (init_packet->msg.v1_msg.
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send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
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netdev_err(ndev, "Unable to complete receive buffer "
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"initialization with NetVsp - status %d\n",
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init_packet->msg.v1_msg.
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send_recv_buf_complete.status);
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ret = -EINVAL;
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goto cleanup;
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}
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/* Parse the response */
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net_device->recv_section_cnt = init_packet->msg.
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v1_msg.send_recv_buf_complete.num_sections;
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net_device->recv_section = kmemdup(
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init_packet->msg.v1_msg.send_recv_buf_complete.sections,
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net_device->recv_section_cnt *
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sizeof(struct nvsp_1_receive_buffer_section),
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GFP_KERNEL);
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if (net_device->recv_section == NULL) {
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ret = -EINVAL;
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goto cleanup;
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}
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/*
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* For 1st release, there should only be 1 section that represents the
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* entire receive buffer
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*/
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if (net_device->recv_section_cnt != 1 ||
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net_device->recv_section->offset != 0) {
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ret = -EINVAL;
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goto cleanup;
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}
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goto exit;
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cleanup:
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netvsc_destroy_recv_buf(net_device);
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exit:
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return ret;
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}
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/* Negotiate NVSP protocol version */
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static int negotiate_nvsp_ver(struct hv_device *device,
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struct netvsc_device *net_device,
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struct nvsp_message *init_packet,
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u32 nvsp_ver)
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{
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int ret, t;
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memset(init_packet, 0, sizeof(struct nvsp_message));
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init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
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init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
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init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
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/* Send the init request */
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ret = vmbus_sendpacket(device->channel, init_packet,
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sizeof(struct nvsp_message),
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(unsigned long)init_packet,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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if (ret != 0)
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return ret;
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t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
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if (t == 0)
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return -ETIMEDOUT;
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if (init_packet->msg.init_msg.init_complete.status !=
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NVSP_STAT_SUCCESS)
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return -EINVAL;
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if (nvsp_ver != NVSP_PROTOCOL_VERSION_2)
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return 0;
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/* NVSPv2 only: Send NDIS config */
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memset(init_packet, 0, sizeof(struct nvsp_message));
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init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
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init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu;
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init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
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ret = vmbus_sendpacket(device->channel, init_packet,
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sizeof(struct nvsp_message),
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(unsigned long)init_packet,
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VM_PKT_DATA_INBAND, 0);
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return ret;
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}
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static int netvsc_connect_vsp(struct hv_device *device)
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{
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int ret;
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struct netvsc_device *net_device;
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struct nvsp_message *init_packet;
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int ndis_version;
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struct net_device *ndev;
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net_device = get_outbound_net_device(device);
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if (!net_device)
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return -ENODEV;
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ndev = net_device->ndev;
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init_packet = &net_device->channel_init_pkt;
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/* Negotiate the latest NVSP protocol supported */
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if (negotiate_nvsp_ver(device, net_device, init_packet,
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NVSP_PROTOCOL_VERSION_2) == 0) {
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net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2;
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} else if (negotiate_nvsp_ver(device, net_device, init_packet,
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NVSP_PROTOCOL_VERSION_1) == 0) {
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net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1;
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} else {
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ret = -EPROTO;
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goto cleanup;
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}
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pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
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/* Send the ndis version */
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memset(init_packet, 0, sizeof(struct nvsp_message));
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ndis_version = 0x00050001;
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init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
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init_packet->msg.v1_msg.
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send_ndis_ver.ndis_major_ver =
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(ndis_version & 0xFFFF0000) >> 16;
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init_packet->msg.v1_msg.
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send_ndis_ver.ndis_minor_ver =
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ndis_version & 0xFFFF;
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/* Send the init request */
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ret = vmbus_sendpacket(device->channel, init_packet,
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sizeof(struct nvsp_message),
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(unsigned long)init_packet,
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VM_PKT_DATA_INBAND, 0);
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if (ret != 0)
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goto cleanup;
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/* Post the big receive buffer to NetVSP */
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ret = netvsc_init_recv_buf(device);
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cleanup:
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return ret;
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}
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static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
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{
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netvsc_destroy_recv_buf(net_device);
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}
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/*
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* netvsc_device_remove - Callback when the root bus device is removed
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*/
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int netvsc_device_remove(struct hv_device *device)
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{
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struct netvsc_device *net_device;
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struct hv_netvsc_packet *netvsc_packet, *pos;
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unsigned long flags;
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net_device = hv_get_drvdata(device);
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spin_lock_irqsave(&device->channel->inbound_lock, flags);
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net_device->destroy = true;
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spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
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/* Wait for all send completions */
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while (atomic_read(&net_device->num_outstanding_sends)) {
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dev_info(&device->device,
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"waiting for %d requests to complete...\n",
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atomic_read(&net_device->num_outstanding_sends));
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udelay(100);
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}
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netvsc_disconnect_vsp(net_device);
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/*
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* Since we have already drained, we don't need to busy wait
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* as was done in final_release_stor_device()
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* Note that we cannot set the ext pointer to NULL until
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* we have drained - to drain the outgoing packets, we need to
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* allow incoming packets.
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*/
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spin_lock_irqsave(&device->channel->inbound_lock, flags);
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hv_set_drvdata(device, NULL);
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spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
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/*
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* At this point, no one should be accessing net_device
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* except in here
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*/
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dev_notice(&device->device, "net device safe to remove\n");
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/* Now, we can close the channel safely */
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vmbus_close(device->channel);
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/* Release all resources */
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list_for_each_entry_safe(netvsc_packet, pos,
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&net_device->recv_pkt_list, list_ent) {
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list_del(&netvsc_packet->list_ent);
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kfree(netvsc_packet);
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}
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kfree(net_device);
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return 0;
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}
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static void netvsc_send_completion(struct hv_device *device,
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struct vmpacket_descriptor *packet)
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{
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struct netvsc_device *net_device;
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struct nvsp_message *nvsp_packet;
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struct hv_netvsc_packet *nvsc_packet;
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struct net_device *ndev;
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net_device = get_inbound_net_device(device);
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if (!net_device)
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return;
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ndev = net_device->ndev;
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nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
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(packet->offset8 << 3));
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|
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if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
|
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(nvsp_packet->hdr.msg_type ==
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NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
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(nvsp_packet->hdr.msg_type ==
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NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) {
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/* Copy the response back */
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memcpy(&net_device->channel_init_pkt, nvsp_packet,
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sizeof(struct nvsp_message));
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complete(&net_device->channel_init_wait);
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} else if (nvsp_packet->hdr.msg_type ==
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NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
|
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/* Get the send context */
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nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
|
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packet->trans_id;
|
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|
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/* Notify the layer above us */
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nvsc_packet->completion.send.send_completion(
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nvsc_packet->completion.send.send_completion_ctx);
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|
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atomic_dec(&net_device->num_outstanding_sends);
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|
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if (netif_queue_stopped(ndev) && !net_device->start_remove)
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netif_wake_queue(ndev);
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} else {
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netdev_err(ndev, "Unknown send completion packet type- "
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"%d received!!\n", nvsp_packet->hdr.msg_type);
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}
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|
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}
|
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|
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int netvsc_send(struct hv_device *device,
|
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struct hv_netvsc_packet *packet)
|
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{
|
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struct netvsc_device *net_device;
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int ret = 0;
|
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struct nvsp_message sendMessage;
|
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struct net_device *ndev;
|
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|
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net_device = get_outbound_net_device(device);
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if (!net_device)
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return -ENODEV;
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ndev = net_device->ndev;
|
|
|
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sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
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if (packet->is_data_pkt) {
|
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/* 0 is RMC_DATA; */
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sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0;
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} else {
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/* 1 is RMC_CONTROL; */
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sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1;
|
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}
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|
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/* Not using send buffer section */
|
|
sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
|
|
0xFFFFFFFF;
|
|
sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
|
|
|
|
if (packet->page_buf_cnt) {
|
|
ret = vmbus_sendpacket_pagebuffer(device->channel,
|
|
packet->page_buf,
|
|
packet->page_buf_cnt,
|
|
&sendMessage,
|
|
sizeof(struct nvsp_message),
|
|
(unsigned long)packet);
|
|
} else {
|
|
ret = vmbus_sendpacket(device->channel, &sendMessage,
|
|
sizeof(struct nvsp_message),
|
|
(unsigned long)packet,
|
|
VM_PKT_DATA_INBAND,
|
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
|
|
}
|
|
|
|
if (ret == 0) {
|
|
atomic_inc(&net_device->num_outstanding_sends);
|
|
} else if (ret == -EAGAIN) {
|
|
netif_stop_queue(ndev);
|
|
if (atomic_read(&net_device->num_outstanding_sends) < 1)
|
|
netif_wake_queue(ndev);
|
|
} else {
|
|
netdev_err(ndev, "Unable to send packet %p ret %d\n",
|
|
packet, ret);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void netvsc_send_recv_completion(struct hv_device *device,
|
|
u64 transaction_id)
|
|
{
|
|
struct nvsp_message recvcompMessage;
|
|
int retries = 0;
|
|
int ret;
|
|
struct net_device *ndev;
|
|
struct netvsc_device *net_device = hv_get_drvdata(device);
|
|
|
|
ndev = net_device->ndev;
|
|
|
|
recvcompMessage.hdr.msg_type =
|
|
NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
|
|
|
|
/* FIXME: Pass in the status */
|
|
recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status =
|
|
NVSP_STAT_SUCCESS;
|
|
|
|
retry_send_cmplt:
|
|
/* Send the completion */
|
|
ret = vmbus_sendpacket(device->channel, &recvcompMessage,
|
|
sizeof(struct nvsp_message), transaction_id,
|
|
VM_PKT_COMP, 0);
|
|
if (ret == 0) {
|
|
/* success */
|
|
/* no-op */
|
|
} else if (ret == -EAGAIN) {
|
|
/* no more room...wait a bit and attempt to retry 3 times */
|
|
retries++;
|
|
netdev_err(ndev, "unable to send receive completion pkt"
|
|
" (tid %llx)...retrying %d\n", transaction_id, retries);
|
|
|
|
if (retries < 4) {
|
|
udelay(100);
|
|
goto retry_send_cmplt;
|
|
} else {
|
|
netdev_err(ndev, "unable to send receive "
|
|
"completion pkt (tid %llx)...give up retrying\n",
|
|
transaction_id);
|
|
}
|
|
} else {
|
|
netdev_err(ndev, "unable to send receive "
|
|
"completion pkt - %llx\n", transaction_id);
|
|
}
|
|
}
|
|
|
|
/* Send a receive completion packet to RNDIS device (ie NetVsp) */
|
|
static void netvsc_receive_completion(void *context)
|
|
{
|
|
struct hv_netvsc_packet *packet = context;
|
|
struct hv_device *device = (struct hv_device *)packet->device;
|
|
struct netvsc_device *net_device;
|
|
u64 transaction_id = 0;
|
|
bool fsend_receive_comp = false;
|
|
unsigned long flags;
|
|
struct net_device *ndev;
|
|
|
|
/*
|
|
* Even though it seems logical to do a GetOutboundNetDevice() here to
|
|
* send out receive completion, we are using GetInboundNetDevice()
|
|
* since we may have disable outbound traffic already.
|
|
*/
|
|
net_device = get_inbound_net_device(device);
|
|
if (!net_device)
|
|
return;
|
|
ndev = net_device->ndev;
|
|
|
|
/* Overloading use of the lock. */
|
|
spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
|
|
|
|
packet->xfer_page_pkt->count--;
|
|
|
|
/*
|
|
* Last one in the line that represent 1 xfer page packet.
|
|
* Return the xfer page packet itself to the freelist
|
|
*/
|
|
if (packet->xfer_page_pkt->count == 0) {
|
|
fsend_receive_comp = true;
|
|
transaction_id = packet->completion.recv.recv_completion_tid;
|
|
list_add_tail(&packet->xfer_page_pkt->list_ent,
|
|
&net_device->recv_pkt_list);
|
|
|
|
}
|
|
|
|
/* Put the packet back */
|
|
list_add_tail(&packet->list_ent, &net_device->recv_pkt_list);
|
|
spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
|
|
|
|
/* Send a receive completion for the xfer page packet */
|
|
if (fsend_receive_comp)
|
|
netvsc_send_recv_completion(device, transaction_id);
|
|
|
|
}
|
|
|
|
static void netvsc_receive(struct hv_device *device,
|
|
struct vmpacket_descriptor *packet)
|
|
{
|
|
struct netvsc_device *net_device;
|
|
struct vmtransfer_page_packet_header *vmxferpage_packet;
|
|
struct nvsp_message *nvsp_packet;
|
|
struct hv_netvsc_packet *netvsc_packet = NULL;
|
|
/* struct netvsc_driver *netvscDriver; */
|
|
struct xferpage_packet *xferpage_packet = NULL;
|
|
int i;
|
|
int count = 0;
|
|
unsigned long flags;
|
|
struct net_device *ndev;
|
|
|
|
LIST_HEAD(listHead);
|
|
|
|
net_device = get_inbound_net_device(device);
|
|
if (!net_device)
|
|
return;
|
|
ndev = net_device->ndev;
|
|
|
|
/*
|
|
* All inbound packets other than send completion should be xfer page
|
|
* packet
|
|
*/
|
|
if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
|
|
netdev_err(ndev, "Unknown packet type received - %d\n",
|
|
packet->type);
|
|
return;
|
|
}
|
|
|
|
nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
|
|
(packet->offset8 << 3));
|
|
|
|
/* Make sure this is a valid nvsp packet */
|
|
if (nvsp_packet->hdr.msg_type !=
|
|
NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
|
|
netdev_err(ndev, "Unknown nvsp packet type received-"
|
|
" %d\n", nvsp_packet->hdr.msg_type);
|
|
return;
|
|
}
|
|
|
|
vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
|
|
|
|
if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
|
|
netdev_err(ndev, "Invalid xfer page set id - "
|
|
"expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
|
|
vmxferpage_packet->xfer_pageset_id);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Grab free packets (range count + 1) to represent this xfer
|
|
* page packet. +1 to represent the xfer page packet itself.
|
|
* We grab it here so that we know exactly how many we can
|
|
* fulfil
|
|
*/
|
|
spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
|
|
while (!list_empty(&net_device->recv_pkt_list)) {
|
|
list_move_tail(net_device->recv_pkt_list.next, &listHead);
|
|
if (++count == vmxferpage_packet->range_cnt + 1)
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
|
|
|
|
/*
|
|
* We need at least 2 netvsc pkts (1 to represent the xfer
|
|
* page and at least 1 for the range) i.e. we can handled
|
|
* some of the xfer page packet ranges...
|
|
*/
|
|
if (count < 2) {
|
|
netdev_err(ndev, "Got only %d netvsc pkt...needed "
|
|
"%d pkts. Dropping this xfer page packet completely!\n",
|
|
count, vmxferpage_packet->range_cnt + 1);
|
|
|
|
/* Return it to the freelist */
|
|
spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
|
|
for (i = count; i != 0; i--) {
|
|
list_move_tail(listHead.next,
|
|
&net_device->recv_pkt_list);
|
|
}
|
|
spin_unlock_irqrestore(&net_device->recv_pkt_list_lock,
|
|
flags);
|
|
|
|
netvsc_send_recv_completion(device,
|
|
vmxferpage_packet->d.trans_id);
|
|
|
|
return;
|
|
}
|
|
|
|
/* Remove the 1st packet to represent the xfer page packet itself */
|
|
xferpage_packet = (struct xferpage_packet *)listHead.next;
|
|
list_del(&xferpage_packet->list_ent);
|
|
|
|
/* This is how much we can satisfy */
|
|
xferpage_packet->count = count - 1;
|
|
|
|
if (xferpage_packet->count != vmxferpage_packet->range_cnt) {
|
|
netdev_err(ndev, "Needed %d netvsc pkts to satisfy "
|
|
"this xfer page...got %d\n",
|
|
vmxferpage_packet->range_cnt, xferpage_packet->count);
|
|
}
|
|
|
|
/* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
|
|
for (i = 0; i < (count - 1); i++) {
|
|
netvsc_packet = (struct hv_netvsc_packet *)listHead.next;
|
|
list_del(&netvsc_packet->list_ent);
|
|
|
|
/* Initialize the netvsc packet */
|
|
netvsc_packet->xfer_page_pkt = xferpage_packet;
|
|
netvsc_packet->completion.recv.recv_completion =
|
|
netvsc_receive_completion;
|
|
netvsc_packet->completion.recv.recv_completion_ctx =
|
|
netvsc_packet;
|
|
netvsc_packet->device = device;
|
|
/* Save this so that we can send it back */
|
|
netvsc_packet->completion.recv.recv_completion_tid =
|
|
vmxferpage_packet->d.trans_id;
|
|
|
|
netvsc_packet->data = (void *)((unsigned long)net_device->
|
|
recv_buf + vmxferpage_packet->ranges[i].byte_offset);
|
|
netvsc_packet->total_data_buflen =
|
|
vmxferpage_packet->ranges[i].byte_count;
|
|
|
|
/* Pass it to the upper layer */
|
|
rndis_filter_receive(device, netvsc_packet);
|
|
|
|
netvsc_receive_completion(netvsc_packet->
|
|
completion.recv.recv_completion_ctx);
|
|
}
|
|
|
|
}
|
|
|
|
static void netvsc_channel_cb(void *context)
|
|
{
|
|
int ret;
|
|
struct hv_device *device = context;
|
|
struct netvsc_device *net_device;
|
|
u32 bytes_recvd;
|
|
u64 request_id;
|
|
unsigned char *packet;
|
|
struct vmpacket_descriptor *desc;
|
|
unsigned char *buffer;
|
|
int bufferlen = NETVSC_PACKET_SIZE;
|
|
struct net_device *ndev;
|
|
|
|
packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
|
|
GFP_ATOMIC);
|
|
if (!packet)
|
|
return;
|
|
buffer = packet;
|
|
|
|
net_device = get_inbound_net_device(device);
|
|
if (!net_device)
|
|
goto out;
|
|
ndev = net_device->ndev;
|
|
|
|
do {
|
|
ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen,
|
|
&bytes_recvd, &request_id);
|
|
if (ret == 0) {
|
|
if (bytes_recvd > 0) {
|
|
desc = (struct vmpacket_descriptor *)buffer;
|
|
switch (desc->type) {
|
|
case VM_PKT_COMP:
|
|
netvsc_send_completion(device, desc);
|
|
break;
|
|
|
|
case VM_PKT_DATA_USING_XFER_PAGES:
|
|
netvsc_receive(device, desc);
|
|
break;
|
|
|
|
default:
|
|
netdev_err(ndev,
|
|
"unhandled packet type %d, "
|
|
"tid %llx len %d\n",
|
|
desc->type, request_id,
|
|
bytes_recvd);
|
|
break;
|
|
}
|
|
|
|
/* reset */
|
|
if (bufferlen > NETVSC_PACKET_SIZE) {
|
|
kfree(buffer);
|
|
buffer = packet;
|
|
bufferlen = NETVSC_PACKET_SIZE;
|
|
}
|
|
} else {
|
|
/* reset */
|
|
if (bufferlen > NETVSC_PACKET_SIZE) {
|
|
kfree(buffer);
|
|
buffer = packet;
|
|
bufferlen = NETVSC_PACKET_SIZE;
|
|
}
|
|
|
|
break;
|
|
}
|
|
} else if (ret == -ENOBUFS) {
|
|
/* Handle large packet */
|
|
buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
|
|
if (buffer == NULL) {
|
|
/* Try again next time around */
|
|
netdev_err(ndev,
|
|
"unable to allocate buffer of size "
|
|
"(%d)!!\n", bytes_recvd);
|
|
break;
|
|
}
|
|
|
|
bufferlen = bytes_recvd;
|
|
}
|
|
} while (1);
|
|
|
|
out:
|
|
kfree(buffer);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* netvsc_device_add - Callback when the device belonging to this
|
|
* driver is added
|
|
*/
|
|
int netvsc_device_add(struct hv_device *device, void *additional_info)
|
|
{
|
|
int ret = 0;
|
|
int i;
|
|
int ring_size =
|
|
((struct netvsc_device_info *)additional_info)->ring_size;
|
|
struct netvsc_device *net_device;
|
|
struct hv_netvsc_packet *packet, *pos;
|
|
struct net_device *ndev;
|
|
|
|
net_device = alloc_net_device(device);
|
|
if (!net_device) {
|
|
ret = -ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* Coming into this function, struct net_device * is
|
|
* registered as the driver private data.
|
|
* In alloc_net_device(), we register struct netvsc_device *
|
|
* as the driver private data and stash away struct net_device *
|
|
* in struct netvsc_device *.
|
|
*/
|
|
ndev = net_device->ndev;
|
|
|
|
/* Initialize the NetVSC channel extension */
|
|
net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
|
|
spin_lock_init(&net_device->recv_pkt_list_lock);
|
|
|
|
INIT_LIST_HEAD(&net_device->recv_pkt_list);
|
|
|
|
for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) {
|
|
packet = kzalloc(sizeof(struct hv_netvsc_packet) +
|
|
(NETVSC_RECEIVE_SG_COUNT *
|
|
sizeof(struct hv_page_buffer)), GFP_KERNEL);
|
|
if (!packet)
|
|
break;
|
|
|
|
list_add_tail(&packet->list_ent,
|
|
&net_device->recv_pkt_list);
|
|
}
|
|
init_completion(&net_device->channel_init_wait);
|
|
|
|
/* Open the channel */
|
|
ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
|
|
ring_size * PAGE_SIZE, NULL, 0,
|
|
netvsc_channel_cb, device);
|
|
|
|
if (ret != 0) {
|
|
netdev_err(ndev, "unable to open channel: %d\n", ret);
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Channel is opened */
|
|
pr_info("hv_netvsc channel opened successfully\n");
|
|
|
|
/* Connect with the NetVsp */
|
|
ret = netvsc_connect_vsp(device);
|
|
if (ret != 0) {
|
|
netdev_err(ndev,
|
|
"unable to connect to NetVSP - %d\n", ret);
|
|
goto close;
|
|
}
|
|
|
|
return ret;
|
|
|
|
close:
|
|
/* Now, we can close the channel safely */
|
|
vmbus_close(device->channel);
|
|
|
|
cleanup:
|
|
|
|
if (net_device) {
|
|
list_for_each_entry_safe(packet, pos,
|
|
&net_device->recv_pkt_list,
|
|
list_ent) {
|
|
list_del(&packet->list_ent);
|
|
kfree(packet);
|
|
}
|
|
|
|
kfree(net_device);
|
|
}
|
|
|
|
return ret;
|
|
}
|