Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2009, Microsoft Corporation.
 *
 * Authors:
 *   Haiyang Zhang <haiyangz@microsoft.com>
 *   Hank Janssen  <hjanssen@microsoft.com>
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/if_ether.h>
#include <linux/vmalloc.h>
#include <linux/rtnetlink.h>
#include <linux/prefetch.h>
 
#include <asm/sync_bitops.h>
 
#include "hyperv_net.h"
#include "netvsc_trace.h"
 
/*
 * Switch the data path from the synthetic interface to the VF
 * interface.
 */
void netvsc_switch_datapath(struct net_device *ndev, bool vf)
{
<------>struct net_device_context *net_device_ctx = netdev_priv(ndev);
<------>struct hv_device *dev = net_device_ctx->device_ctx;
<------>struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev);
<------>struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt;
 
<------>memset(init_pkt, 0, sizeof(struct nvsp_message));
<------>init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH;
<------>if (vf)
<------><------>init_pkt->msg.v4_msg.active_dp.active_datapath =
<------><------><------>NVSP_DATAPATH_VF;
<------>else
<------><------>init_pkt->msg.v4_msg.active_dp.active_datapath =
<------><------><------>NVSP_DATAPATH_SYNTHETIC;
 
<------>trace_nvsp_send(ndev, init_pkt);
 
<------>vmbus_sendpacket(dev->channel, init_pkt,
<------><------><------>       sizeof(struct nvsp_message),
<------><------><------>       (unsigned long)init_pkt,
<------><------><------>       VM_PKT_DATA_INBAND, 0);
}
 
/* Worker to setup sub channels on initial setup
 * Initial hotplug event occurs in softirq context
 * and can't wait for channels.
 */
static void netvsc_subchan_work(struct work_struct *w)
{
<------>struct netvsc_device *nvdev =
<------><------>container_of(w, struct netvsc_device, subchan_work);
<------>struct rndis_device *rdev;
<------>int i, ret;
 
<------>/* Avoid deadlock with device removal already under RTNL */
<------>if (!rtnl_trylock()) {
<------><------>schedule_work(w);
<------><------>return;
<------>}
 
<------>rdev = nvdev->extension;
<------>if (rdev) {
<------><------>ret = rndis_set_subchannel(rdev->ndev, nvdev, NULL);
<------><------>if (ret == 0) {
<------><------><------>netif_device_attach(rdev->ndev);
<------><------>} else {
<------><------><------>/* fallback to only primary channel */
<------><------><------>for (i = 1; i < nvdev->num_chn; i++)
<------><------><------><------>netif_napi_del(&nvdev->chan_table[i].napi);
 
<------><------><------>nvdev->max_chn = 1;
<------><------><------>nvdev->num_chn = 1;
<------><------>}
<------>}
 
<------>rtnl_unlock();
}
 
static struct netvsc_device *alloc_net_device(void)
{
<------>struct netvsc_device *net_device;
 
<------>net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
<------>if (!net_device)
<------><------>return NULL;
 
<------>init_waitqueue_head(&net_device->wait_drain);
<------>net_device->destroy = false;
<------>net_device->tx_disable = true;
 
<------>net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
<------>net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
 
<------>init_completion(&net_device->channel_init_wait);
<------>init_waitqueue_head(&net_device->subchan_open);
<------>INIT_WORK(&net_device->subchan_work, netvsc_subchan_work);
 
<------>return net_device;
}
 
static void free_netvsc_device(struct rcu_head *head)
{
<------>struct netvsc_device *nvdev
<------><------>= container_of(head, struct netvsc_device, rcu);
<------>int i;
 
<------>kfree(nvdev->extension);
<------>vfree(nvdev->recv_buf);
<------>vfree(nvdev->send_buf);
<------>kfree(nvdev->send_section_map);
 
<------>for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
<------><------>xdp_rxq_info_unreg(&nvdev->chan_table[i].xdp_rxq);
<------><------>vfree(nvdev->chan_table[i].mrc.slots);
<------>}
 
<------>kfree(nvdev);
}
 
static void free_netvsc_device_rcu(struct netvsc_device *nvdev)
{
<------>call_rcu(&nvdev->rcu, free_netvsc_device);
}
 
static void netvsc_revoke_recv_buf(struct hv_device *device,
<------><------><------><------>   struct netvsc_device *net_device,
<------><------><------><------>   struct net_device *ndev)
{
<------>struct nvsp_message *revoke_packet;
<------>int ret;
 
<------>/*
<------> * If we got a section count, it means we received a
<------> * SendReceiveBufferComplete msg (ie sent
<------> * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
<------> * to send a revoke msg here
<------> */
<------>if (net_device->recv_section_cnt) {
<------><------>/* Send the revoke receive buffer */
<------><------>revoke_packet = &net_device->revoke_packet;
<------><------>memset(revoke_packet, 0, sizeof(struct nvsp_message));
 
<------><------>revoke_packet->hdr.msg_type =
<------><------><------>NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
<------><------>revoke_packet->msg.v1_msg.
<------><------>revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
 
<------><------>trace_nvsp_send(ndev, revoke_packet);
 
<------><------>ret = vmbus_sendpacket(device->channel,
<------><------><------><------>       revoke_packet,
<------><------><------><------>       sizeof(struct nvsp_message),
<------><------><------><------>       (unsigned long)revoke_packet,
<------><------><------><------>       VM_PKT_DATA_INBAND, 0);
<------><------>/* If the failure is because the channel is rescinded;
<------><------> * ignore the failure since we cannot send on a rescinded
<------><------> * channel. This would allow us to properly cleanup
<------><------> * even when the channel is rescinded.
<------><------> */
<------><------>if (device->channel->rescind)
<------><------><------>ret = 0;
<------><------>/*
<------><------> * If we failed here, we might as well return and
<------><------> * have a leak rather than continue and a bugchk
<------><------> */
<------><------>if (ret != 0) {
<------><------><------>netdev_err(ndev, "unable to send "
<------><------><------><------>"revoke receive buffer to netvsp\n");
<------><------><------>return;
<------><------>}
<------><------>net_device->recv_section_cnt = 0;
<------>}
}
 
static void netvsc_revoke_send_buf(struct hv_device *device,
<------><------><------><------>   struct netvsc_device *net_device,
<------><------><------><------>   struct net_device *ndev)
{
<------>struct nvsp_message *revoke_packet;
<------>int ret;
 
<------>/* Deal with the send buffer we may have setup.
<------> * If we got a  send section size, it means we received a
<------> * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
<------> * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need
<------> * to send a revoke msg here
<------> */
<------>if (net_device->send_section_cnt) {
<------><------>/* Send the revoke receive buffer */
<------><------>revoke_packet = &net_device->revoke_packet;
<------><------>memset(revoke_packet, 0, sizeof(struct nvsp_message));
 
<------><------>revoke_packet->hdr.msg_type =
<------><------><------>NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
<------><------>revoke_packet->msg.v1_msg.revoke_send_buf.id =
<------><------><------>NETVSC_SEND_BUFFER_ID;
 
<------><------>trace_nvsp_send(ndev, revoke_packet);
 
<------><------>ret = vmbus_sendpacket(device->channel,
<------><------><------><------>       revoke_packet,
<------><------><------><------>       sizeof(struct nvsp_message),
<------><------><------><------>       (unsigned long)revoke_packet,
<------><------><------><------>       VM_PKT_DATA_INBAND, 0);
 
<------><------>/* If the failure is because the channel is rescinded;
<------><------> * ignore the failure since we cannot send on a rescinded
<------><------> * channel. This would allow us to properly cleanup
<------><------> * even when the channel is rescinded.
<------><------> */
<------><------>if (device->channel->rescind)
<------><------><------>ret = 0;
 
<------><------>/* If we failed here, we might as well return and
<------><------> * have a leak rather than continue and a bugchk
<------><------> */
<------><------>if (ret != 0) {
<------><------><------>netdev_err(ndev, "unable to send "
<------><------><------><------>   "revoke send buffer to netvsp\n");
<------><------><------>return;
<------><------>}
<------><------>net_device->send_section_cnt = 0;
<------>}
}
 
static void netvsc_teardown_recv_gpadl(struct hv_device *device,
<------><------><------><------>       struct netvsc_device *net_device,
<------><------><------><------>       struct net_device *ndev)
{
<------>int ret;
 
<------>if (net_device->recv_buf_gpadl_handle) {
<------><------>ret = vmbus_teardown_gpadl(device->channel,
<------><------><------><------><------>   net_device->recv_buf_gpadl_handle);
 
<------><------>/* If we failed here, we might as well return and have a leak
<------><------> * rather than continue and a bugchk
<------><------> */
<------><------>if (ret != 0) {
<------><------><------>netdev_err(ndev,
<------><------><------><------>   "unable to teardown receive buffer's gpadl\n");
<------><------><------>return;
<------><------>}
<------><------>net_device->recv_buf_gpadl_handle = 0;
<------>}
}
 
static void netvsc_teardown_send_gpadl(struct hv_device *device,
<------><------><------><------>       struct netvsc_device *net_device,
<------><------><------><------>       struct net_device *ndev)
{
<------>int ret;
 
<------>if (net_device->send_buf_gpadl_handle) {
<------><------>ret = vmbus_teardown_gpadl(device->channel,
<------><------><------><------><------>   net_device->send_buf_gpadl_handle);
 
<------><------>/* If we failed here, we might as well return and have a leak
<------><------> * rather than continue and a bugchk
<------><------> */
<------><------>if (ret != 0) {
<------><------><------>netdev_err(ndev,
<------><------><------><------>   "unable to teardown send buffer's gpadl\n");
<------><------><------>return;
<------><------>}
<------><------>net_device->send_buf_gpadl_handle = 0;
<------>}
}
 
int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx)
{
<------>struct netvsc_channel *nvchan = &net_device->chan_table[q_idx];
<------>int node = cpu_to_node(nvchan->channel->target_cpu);
<------>size_t size;
 
<------>size = net_device->recv_completion_cnt * sizeof(struct recv_comp_data);
<------>nvchan->mrc.slots = vzalloc_node(size, node);
<------>if (!nvchan->mrc.slots)
<------><------>nvchan->mrc.slots = vzalloc(size);
 
<------>return nvchan->mrc.slots ? 0 : -ENOMEM;
}
 
static int netvsc_init_buf(struct hv_device *device,
<------><------><------>   struct netvsc_device *net_device,
<------><------><------>   const struct netvsc_device_info *device_info)
{
<------>struct nvsp_1_message_send_receive_buffer_complete *resp;
<------>struct net_device *ndev = hv_get_drvdata(device);
<------>struct nvsp_message *init_packet;
<------>unsigned int buf_size;
<------>size_t map_words;
<------>int ret = 0;
 
<------>/* Get receive buffer area. */
<------>buf_size = device_info->recv_sections * device_info->recv_section_size;
<------>buf_size = roundup(buf_size, PAGE_SIZE);
 
<------>/* Legacy hosts only allow smaller receive buffer */
<------>if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
<------><------>buf_size = min_t(unsigned int, buf_size,
<------><------><------><------> NETVSC_RECEIVE_BUFFER_SIZE_LEGACY);
 
<------>net_device->recv_buf = vzalloc(buf_size);
<------>if (!net_device->recv_buf) {
<------><------>netdev_err(ndev,
<------><------><------>   "unable to allocate receive buffer of size %u\n",
<------><------><------>   buf_size);
<------><------>ret = -ENOMEM;
<------><------>goto cleanup;
<------>}
 
<------>net_device->recv_buf_size = buf_size;
 
<------>/*
<------> * Establish the gpadl handle for this buffer on this
<------> * channel.  Note: This call uses the vmbus connection rather
<------> * than the channel to establish the gpadl handle.
<------> */
<------>ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
<------><------><------><------>    buf_size,
<------><------><------><------>    &net_device->recv_buf_gpadl_handle);
<------>if (ret != 0) {
<------><------>netdev_err(ndev,
<------><------><------>"unable to establish receive buffer's gpadl\n");
<------><------>goto cleanup;
<------>}
 
<------>/* Notify the NetVsp of the gpadl handle */
<------>init_packet = &net_device->channel_init_pkt;
<------>memset(init_packet, 0, sizeof(struct nvsp_message));
<------>init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
<------>init_packet->msg.v1_msg.send_recv_buf.
<------><------>gpadl_handle = net_device->recv_buf_gpadl_handle;
<------>init_packet->msg.v1_msg.
<------><------>send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
 
<------>trace_nvsp_send(ndev, init_packet);
 
<------>/* Send the gpadl notification request */
<------>ret = vmbus_sendpacket(device->channel, init_packet,
<------><------><------>       sizeof(struct nvsp_message),
<------><------><------>       (unsigned long)init_packet,
<------><------><------>       VM_PKT_DATA_INBAND,
<------><------><------>       VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
<------>if (ret != 0) {
<------><------>netdev_err(ndev,
<------><------><------>"unable to send receive buffer's gpadl to netvsp\n");
<------><------>goto cleanup;
<------>}
 
<------>wait_for_completion(&net_device->channel_init_wait);
 
<------>/* Check the response */
<------>resp = &init_packet->msg.v1_msg.send_recv_buf_complete;
<------>if (resp->status != NVSP_STAT_SUCCESS) {
<------><------>netdev_err(ndev,
<------><------><------>   "Unable to complete receive buffer initialization with NetVsp - status %d\n",
<------><------><------>   resp->status);
<------><------>ret = -EINVAL;
<------><------>goto cleanup;
<------>}
 
<------>/* Parse the response */
<------>netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n",
<------><------>   resp->num_sections, resp->sections[0].sub_alloc_size,
<------><------>   resp->sections[0].num_sub_allocs);
 
<------>/* There should only be one section for the entire receive buffer */
<------>if (resp->num_sections != 1 || resp->sections[0].offset != 0) {
<------><------>ret = -EINVAL;
<------><------>goto cleanup;
<------>}
 
<------>net_device->recv_section_size = resp->sections[0].sub_alloc_size;
<------>net_device->recv_section_cnt = resp->sections[0].num_sub_allocs;
 
<------>/* Ensure buffer will not overflow */
<------>if (net_device->recv_section_size < NETVSC_MTU_MIN || (u64)net_device->recv_section_size *
<------>    (u64)net_device->recv_section_cnt > (u64)buf_size) {
<------><------>netdev_err(ndev, "invalid recv_section_size %u\n",
<------><------><------>   net_device->recv_section_size);
<------><------>ret = -EINVAL;
<------><------>goto cleanup;
<------>}
 
<------>/* Setup receive completion ring.
<------> * Add 1 to the recv_section_cnt because at least one entry in a
<------> * ring buffer has to be empty.
<------> */
<------>net_device->recv_completion_cnt = net_device->recv_section_cnt + 1;
<------>ret = netvsc_alloc_recv_comp_ring(net_device, 0);
<------>if (ret)
<------><------>goto cleanup;
 
<------>/* Now setup the send buffer. */
<------>buf_size = device_info->send_sections * device_info->send_section_size;
<------>buf_size = round_up(buf_size, PAGE_SIZE);
 
<------>net_device->send_buf = vzalloc(buf_size);
<------>if (!net_device->send_buf) {
<------><------>netdev_err(ndev, "unable to allocate send buffer of size %u\n",
<------><------><------>   buf_size);
<------><------>ret = -ENOMEM;
<------><------>goto cleanup;
<------>}
 
<------>/* Establish the gpadl handle for this buffer on this
<------> * channel.  Note: This call uses the vmbus connection rather
<------> * than the channel to establish the gpadl handle.
<------> */
<------>ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
<------><------><------><------>    buf_size,
<------><------><------><------>    &net_device->send_buf_gpadl_handle);
<------>if (ret != 0) {
<------><------>netdev_err(ndev,
<------><------><------>   "unable to establish send buffer's gpadl\n");
<------><------>goto cleanup;
<------>}
 
<------>/* Notify the NetVsp of the gpadl handle */
<------>init_packet = &net_device->channel_init_pkt;
<------>memset(init_packet, 0, sizeof(struct nvsp_message));
<------>init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
<------>init_packet->msg.v1_msg.send_send_buf.gpadl_handle =
<------><------>net_device->send_buf_gpadl_handle;
<------>init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
 
<------>trace_nvsp_send(ndev, init_packet);
 
<------>/* Send the gpadl notification request */
<------>ret = vmbus_sendpacket(device->channel, init_packet,
<------><------><------>       sizeof(struct nvsp_message),
<------><------><------>       (unsigned long)init_packet,
<------><------><------>       VM_PKT_DATA_INBAND,
<------><------><------>       VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
<------>if (ret != 0) {
<------><------>netdev_err(ndev,
<------><------><------>   "unable to send send buffer's gpadl to netvsp\n");
<------><------>goto cleanup;
<------>}
 
<------>wait_for_completion(&net_device->channel_init_wait);
 
<------>/* Check the response */
<------>if (init_packet->msg.v1_msg.
<------>    send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
<------><------>netdev_err(ndev, "Unable to complete send buffer "
<------><------><------>   "initialization with NetVsp - status %d\n",
<------><------><------>   init_packet->msg.v1_msg.
<------><------><------>   send_send_buf_complete.status);
<------><------>ret = -EINVAL;
<------><------>goto cleanup;
<------>}
 
<------>/* Parse the response */
<------>net_device->send_section_size = init_packet->msg.
<------><------><------><------>v1_msg.send_send_buf_complete.section_size;
<------>if (net_device->send_section_size < NETVSC_MTU_MIN) {
<------><------>netdev_err(ndev, "invalid send_section_size %u\n",
<------><------><------>   net_device->send_section_size);
<------><------>ret = -EINVAL;
<------><------>goto cleanup;
<------>}
 
<------>/* Section count is simply the size divided by the section size. */
<------>net_device->send_section_cnt = buf_size / net_device->send_section_size;
 
<------>netdev_dbg(ndev, "Send section size: %d, Section count:%d\n",
<------><------>   net_device->send_section_size, net_device->send_section_cnt);
 
<------>/* Setup state for managing the send buffer. */
<------>map_words = DIV_ROUND_UP(net_device->send_section_cnt, BITS_PER_LONG);
 
<------>net_device->send_section_map = kcalloc(map_words, sizeof(ulong), GFP_KERNEL);
<------>if (net_device->send_section_map == NULL) {
<------><------>ret = -ENOMEM;
<------><------>goto cleanup;
<------>}
 
<------>goto exit;
 
cleanup:
<------>netvsc_revoke_recv_buf(device, net_device, ndev);
<------>netvsc_revoke_send_buf(device, net_device, ndev);
<------>netvsc_teardown_recv_gpadl(device, net_device, ndev);
<------>netvsc_teardown_send_gpadl(device, net_device, ndev);
 
exit:
<------>return ret;
}
 
/* Negotiate NVSP protocol version */
static int negotiate_nvsp_ver(struct hv_device *device,
<------><------><------>      struct netvsc_device *net_device,
<------><------><------>      struct nvsp_message *init_packet,
<------><------><------>      u32 nvsp_ver)
{
<------>struct net_device *ndev = hv_get_drvdata(device);
<------>int ret;
 
<------>memset(init_packet, 0, sizeof(struct nvsp_message));
<------>init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
<------>init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
<------>init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
<------>trace_nvsp_send(ndev, init_packet);
 
<------>/* Send the init request */
<------>ret = vmbus_sendpacket(device->channel, init_packet,
<------><------><------>       sizeof(struct nvsp_message),
<------><------><------>       (unsigned long)init_packet,
<------><------><------>       VM_PKT_DATA_INBAND,
<------><------><------>       VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 
<------>if (ret != 0)
<------><------>return ret;
 
<------>wait_for_completion(&net_device->channel_init_wait);
 
<------>if (init_packet->msg.init_msg.init_complete.status !=
<------>    NVSP_STAT_SUCCESS)
<------><------>return -EINVAL;
 
<------>if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
<------><------>return 0;
 
<------>/* NVSPv2 or later: Send NDIS config */
<------>memset(init_packet, 0, sizeof(struct nvsp_message));
<------>init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
<------>init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN;
<------>init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
 
<------>if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) {
<------><------>init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1;
 
<------><------>/* Teaming bit is needed to receive link speed updates */
<------><------>init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1;
<------>}
 
<------>if (nvsp_ver >= NVSP_PROTOCOL_VERSION_61)
<------><------>init_packet->msg.v2_msg.send_ndis_config.capability.rsc = 1;
 
<------>trace_nvsp_send(ndev, init_packet);
 
<------>ret = vmbus_sendpacket(device->channel, init_packet,
<------><------><------><------>sizeof(struct nvsp_message),
<------><------><------><------>(unsigned long)init_packet,
<------><------><------><------>VM_PKT_DATA_INBAND, 0);
 
<------>return ret;
}
 
static int netvsc_connect_vsp(struct hv_device *device,
<------><------><------>      struct netvsc_device *net_device,
<------><------><------>      const struct netvsc_device_info *device_info)
{
<------>struct net_device *ndev = hv_get_drvdata(device);
<------>static const u32 ver_list[] = {
<------><------>NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
<------><------>NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5,
<------><------>NVSP_PROTOCOL_VERSION_6, NVSP_PROTOCOL_VERSION_61
<------>};
<------>struct nvsp_message *init_packet;
<------>int ndis_version, i, ret;
 
<------>init_packet = &net_device->channel_init_pkt;
 
<------>/* Negotiate the latest NVSP protocol supported */
<------>for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--)
<------><------>if (negotiate_nvsp_ver(device, net_device, init_packet,
<------><------><------><------>       ver_list[i])  == 0) {
<------><------><------>net_device->nvsp_version = ver_list[i];
<------><------><------>break;
<------><------>}
 
<------>if (i < 0) {
<------><------>ret = -EPROTO;
<------><------>goto cleanup;
<------>}
 
<------>pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
 
<------>/* Send the ndis version */
<------>memset(init_packet, 0, sizeof(struct nvsp_message));
 
<------>if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
<------><------>ndis_version = 0x00060001;
<------>else
<------><------>ndis_version = 0x0006001e;
 
<------>init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
<------>init_packet->msg.v1_msg.
<------><------>send_ndis_ver.ndis_major_ver =
<------><------><------><------>(ndis_version & 0xFFFF0000) >> 16;
<------>init_packet->msg.v1_msg.
<------><------>send_ndis_ver.ndis_minor_ver =
<------><------><------><------>ndis_version & 0xFFFF;
 
<------>trace_nvsp_send(ndev, init_packet);
 
<------>/* Send the init request */
<------>ret = vmbus_sendpacket(device->channel, init_packet,
<------><------><------><------>sizeof(struct nvsp_message),
<------><------><------><------>(unsigned long)init_packet,
<------><------><------><------>VM_PKT_DATA_INBAND, 0);
<------>if (ret != 0)
<------><------>goto cleanup;
 
 
<------>ret = netvsc_init_buf(device, net_device, device_info);
 
cleanup:
<------>return ret;
}
 
/*
 * netvsc_device_remove - Callback when the root bus device is removed
 */
void netvsc_device_remove(struct hv_device *device)
{
<------>struct net_device *ndev = hv_get_drvdata(device);
<------>struct net_device_context *net_device_ctx = netdev_priv(ndev);
<------>struct netvsc_device *net_device
<------><------>= rtnl_dereference(net_device_ctx->nvdev);
<------>int i;
 
<------>/*
<------> * Revoke receive buffer. If host is pre-Win2016 then tear down
<------> * receive buffer GPADL. Do the same for send buffer.
<------> */
<------>netvsc_revoke_recv_buf(device, net_device, ndev);
<------>if (vmbus_proto_version < VERSION_WIN10)
<------><------>netvsc_teardown_recv_gpadl(device, net_device, ndev);
 
<------>netvsc_revoke_send_buf(device, net_device, ndev);
<------>if (vmbus_proto_version < VERSION_WIN10)
<------><------>netvsc_teardown_send_gpadl(device, net_device, ndev);
 
<------>RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
 
<------>/* Disable NAPI and disassociate its context from the device. */
<------>for (i = 0; i < net_device->num_chn; i++) {
<------><------>/* See also vmbus_reset_channel_cb(). */
<------><------>napi_disable(&net_device->chan_table[i].napi);
<------><------>netif_napi_del(&net_device->chan_table[i].napi);
<------>}
 
<------>/*
<------> * At this point, no one should be accessing net_device
<------> * except in here
<------> */
<------>netdev_dbg(ndev, "net device safe to remove\n");
 
<------>/* Now, we can close the channel safely */
<------>vmbus_close(device->channel);
 
<------>/*
<------> * If host is Win2016 or higher then we do the GPADL tear down
<------> * here after VMBus is closed.
<------>*/
<------>if (vmbus_proto_version >= VERSION_WIN10) {
<------><------>netvsc_teardown_recv_gpadl(device, net_device, ndev);
<------><------>netvsc_teardown_send_gpadl(device, net_device, ndev);
<------>}
 
<------>/* Release all resources */
<------>free_netvsc_device_rcu(net_device);
}
 
#define RING_AVAIL_PERCENT_HIWATER 20
#define RING_AVAIL_PERCENT_LOWATER 10
 
static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
<------><------><------><------><------> u32 index)
{
<------>sync_change_bit(index, net_device->send_section_map);
}
 
static void netvsc_send_tx_complete(struct net_device *ndev,
<------><------><------><------>    struct netvsc_device *net_device,
<------><------><------><------>    struct vmbus_channel *channel,
<------><------><------><------>    const struct vmpacket_descriptor *desc,
<------><------><------><------>    int budget)
{
<------>struct sk_buff *skb = (struct sk_buff *)(unsigned long)desc->trans_id;
<------>struct net_device_context *ndev_ctx = netdev_priv(ndev);
<------>u16 q_idx = 0;
<------>int queue_sends;
 
<------>/* Notify the layer above us */
<------>if (likely(skb)) {
<------><------>const struct hv_netvsc_packet *packet
<------><------><------>= (struct hv_netvsc_packet *)skb->cb;
<------><------>u32 send_index = packet->send_buf_index;
<------><------>struct netvsc_stats *tx_stats;
 
<------><------>if (send_index != NETVSC_INVALID_INDEX)
<------><------><------>netvsc_free_send_slot(net_device, send_index);
<------><------>q_idx = packet->q_idx;
 
<------><------>tx_stats = &net_device->chan_table[q_idx].tx_stats;
 
<------><------>u64_stats_update_begin(&tx_stats->syncp);
<------><------>tx_stats->packets += packet->total_packets;
<------><------>tx_stats->bytes += packet->total_bytes;
<------><------>u64_stats_update_end(&tx_stats->syncp);
 
<------><------>napi_consume_skb(skb, budget);
<------>}
 
<------>queue_sends =
<------><------>atomic_dec_return(&net_device->chan_table[q_idx].queue_sends);
 
<------>if (unlikely(net_device->destroy)) {
<------><------>if (queue_sends == 0)
<------><------><------>wake_up(&net_device->wait_drain);
<------>} else {
<------><------>struct netdev_queue *txq = netdev_get_tx_queue(ndev, q_idx);
 
<------><------>if (netif_tx_queue_stopped(txq) && !net_device->tx_disable &&
<------><------>    (hv_get_avail_to_write_percent(&channel->outbound) >
<------><------>     RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) {
<------><------><------>netif_tx_wake_queue(txq);
<------><------><------>ndev_ctx->eth_stats.wake_queue++;
<------><------>}
<------>}
}
 
static void netvsc_send_completion(struct net_device *ndev,
<------><------><------><------>   struct netvsc_device *net_device,
<------><------><------><------>   struct vmbus_channel *incoming_channel,
<------><------><------><------>   const struct vmpacket_descriptor *desc,
<------><------><------><------>   int budget)
{
<------>const struct nvsp_message *nvsp_packet = hv_pkt_data(desc);
<------>u32 msglen = hv_pkt_datalen(desc);
 
<------>/* Ensure packet is big enough to read header fields */
<------>if (msglen < sizeof(struct nvsp_message_header)) {
<------><------>netdev_err(ndev, "nvsp_message length too small: %u\n", msglen);
<------><------>return;
<------>}
 
<------>switch (nvsp_packet->hdr.msg_type) {
<------>case NVSP_MSG_TYPE_INIT_COMPLETE:
<------><------>if (msglen < sizeof(struct nvsp_message_header) +
<------><------><------><------>sizeof(struct nvsp_message_init_complete)) {
<------><------><------>netdev_err(ndev, "nvsp_msg length too small: %u\n",
<------><------><------><------>   msglen);
<------><------><------>return;
<------><------>}
<------><------>fallthrough;
 
<------>case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE:
<------><------>if (msglen < sizeof(struct nvsp_message_header) +
<------><------><------><------>sizeof(struct nvsp_1_message_send_receive_buffer_complete)) {
<------><------><------>netdev_err(ndev, "nvsp_msg1 length too small: %u\n",
<------><------><------><------>   msglen);
<------><------><------>return;
<------><------>}
<------><------>fallthrough;
 
<------>case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE:
<------><------>if (msglen < sizeof(struct nvsp_message_header) +
<------><------><------><------>sizeof(struct nvsp_1_message_send_send_buffer_complete)) {
<------><------><------>netdev_err(ndev, "nvsp_msg1 length too small: %u\n",
<------><------><------><------>   msglen);
<------><------><------>return;
<------><------>}
<------><------>fallthrough;
 
<------>case NVSP_MSG5_TYPE_SUBCHANNEL:
<------><------>if (msglen < sizeof(struct nvsp_message_header) +
<------><------><------><------>sizeof(struct nvsp_5_subchannel_complete)) {
<------><------><------>netdev_err(ndev, "nvsp_msg5 length too small: %u\n",
<------><------><------><------>   msglen);
<------><------><------>return;
<------><------>}
<------><------>/* Copy the response back */
<------><------>memcpy(&net_device->channel_init_pkt, nvsp_packet,
<------><------>       sizeof(struct nvsp_message));
<------><------>complete(&net_device->channel_init_wait);
<------><------>break;
 
<------>case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE:
<------><------>netvsc_send_tx_complete(ndev, net_device, incoming_channel,
<------><------><------><------><------>desc, budget);
<------><------>break;
 
<------>default:
<------><------>netdev_err(ndev,
<------><------><------>   "Unknown send completion type %d received!!\n",
<------><------><------>   nvsp_packet->hdr.msg_type);
<------>}
}
 
static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
{
<------>unsigned long *map_addr = net_device->send_section_map;
<------>unsigned int i;
 
<------>for_each_clear_bit(i, map_addr, net_device->send_section_cnt) {
<------><------>if (sync_test_and_set_bit(i, map_addr) == 0)
<------><------><------>return i;
<------>}
 
<------>return NETVSC_INVALID_INDEX;
}
 
static void netvsc_copy_to_send_buf(struct netvsc_device *net_device,
<------><------><------><------>    unsigned int section_index,
<------><------><------><------>    u32 pend_size,
<------><------><------><------>    struct hv_netvsc_packet *packet,
<------><------><------><------>    struct rndis_message *rndis_msg,
<------><------><------><------>    struct hv_page_buffer *pb,
<------><------><------><------>    bool xmit_more)
{
<------>char *start = net_device->send_buf;
<------>char *dest = start + (section_index * net_device->send_section_size)
<------><------>     + pend_size;
<------>int i;
<------>u32 padding = 0;
<------>u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt :
<------><------>packet->page_buf_cnt;
<------>u32 remain;
 
<------>/* Add padding */
<------>remain = packet->total_data_buflen & (net_device->pkt_align - 1);
<------>if (xmit_more && remain) {
<------><------>padding = net_device->pkt_align - remain;
<------><------>rndis_msg->msg_len += padding;
<------><------>packet->total_data_buflen += padding;
<------>}
 
<------>for (i = 0; i < page_count; i++) {
<------><------>char *src = phys_to_virt(pb[i].pfn << HV_HYP_PAGE_SHIFT);
<------><------>u32 offset = pb[i].offset;
<------><------>u32 len = pb[i].len;
 
<------><------>memcpy(dest, (src + offset), len);
<------><------>dest += len;
<------>}
 
<------>if (padding)
<------><------>memset(dest, 0, padding);
}
 
static inline int netvsc_send_pkt(
<------>struct hv_device *device,
<------>struct hv_netvsc_packet *packet,
<------>struct netvsc_device *net_device,
<------>struct hv_page_buffer *pb,
<------>struct sk_buff *skb)
{
<------>struct nvsp_message nvmsg;
<------>struct nvsp_1_message_send_rndis_packet *rpkt =
<------><------>&nvmsg.msg.v1_msg.send_rndis_pkt;
<------>struct netvsc_channel * const nvchan =
<------><------>&net_device->chan_table[packet->q_idx];
<------>struct vmbus_channel *out_channel = nvchan->channel;
<------>struct net_device *ndev = hv_get_drvdata(device);
<------>struct net_device_context *ndev_ctx = netdev_priv(ndev);
<------>struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx);
<------>u64 req_id;
<------>int ret;
<------>u32 ring_avail = hv_get_avail_to_write_percent(&out_channel->outbound);
 
<------>nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
<------>if (skb)
<------><------>rpkt->channel_type = 0;		/* 0 is RMC_DATA */
<------>else
<------><------>rpkt->channel_type = 1;		/* 1 is RMC_CONTROL */
 
<------>rpkt->send_buf_section_index = packet->send_buf_index;
<------>if (packet->send_buf_index == NETVSC_INVALID_INDEX)
<------><------>rpkt->send_buf_section_size = 0;
<------>else
<------><------>rpkt->send_buf_section_size = packet->total_data_buflen;
 
<------>req_id = (ulong)skb;
 
<------>if (out_channel->rescind)
<------><------>return -ENODEV;
 
<------>trace_nvsp_send_pkt(ndev, out_channel, rpkt);
 
<------>if (packet->page_buf_cnt) {
<------><------>if (packet->cp_partial)
<------><------><------>pb += packet->rmsg_pgcnt;
 
<------><------>ret = vmbus_sendpacket_pagebuffer(out_channel,
<------><------><------><------><------><------>  pb, packet->page_buf_cnt,
<------><------><------><------><------><------>  &nvmsg, sizeof(nvmsg),
<------><------><------><------><------><------>  req_id);
<------>} else {
<------><------>ret = vmbus_sendpacket(out_channel,
<------><------><------><------>       &nvmsg, sizeof(nvmsg),
<------><------><------><------>       req_id, VM_PKT_DATA_INBAND,
<------><------><------><------>       VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
<------>}
 
<------>if (ret == 0) {
<------><------>atomic_inc_return(&nvchan->queue_sends);
 
<------><------>if (ring_avail < RING_AVAIL_PERCENT_LOWATER) {
<------><------><------>netif_tx_stop_queue(txq);
<------><------><------>ndev_ctx->eth_stats.stop_queue++;
<------><------>}
<------>} else if (ret == -EAGAIN) {
<------><------>netif_tx_stop_queue(txq);
<------><------>ndev_ctx->eth_stats.stop_queue++;
<------>} else {
<------><------>netdev_err(ndev,
<------><------><------>   "Unable to send packet pages %u len %u, ret %d\n",
<------><------><------>   packet->page_buf_cnt, packet->total_data_buflen,
<------><------><------>   ret);
<------>}
 
<------>if (netif_tx_queue_stopped(txq) &&
<------>    atomic_read(&nvchan->queue_sends) < 1 &&
<------>    !net_device->tx_disable) {
<------><------>netif_tx_wake_queue(txq);
<------><------>ndev_ctx->eth_stats.wake_queue++;
<------><------>if (ret == -EAGAIN)
<------><------><------>ret = -ENOSPC;
<------>}
 
<------>return ret;
}
 
/* Move packet out of multi send data (msd), and clear msd */
static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send,
<------><------><------><------>struct sk_buff **msd_skb,
<------><------><------><------>struct multi_send_data *msdp)
{
<------>*msd_skb = msdp->skb;
<------>*msd_send = msdp->pkt;
<------>msdp->skb = NULL;
<------>msdp->pkt = NULL;
<------>msdp->count = 0;
}
 
/* RCU already held by caller */
int netvsc_send(struct net_device *ndev,
<------><------>struct hv_netvsc_packet *packet,
<------><------>struct rndis_message *rndis_msg,
<------><------>struct hv_page_buffer *pb,
<------><------>struct sk_buff *skb,
<------><------>bool xdp_tx)
{
<------>struct net_device_context *ndev_ctx = netdev_priv(ndev);
<------>struct netvsc_device *net_device
<------><------>= rcu_dereference_bh(ndev_ctx->nvdev);
<------>struct hv_device *device = ndev_ctx->device_ctx;
<------>int ret = 0;
<------>struct netvsc_channel *nvchan;
<------>u32 pktlen = packet->total_data_buflen, msd_len = 0;
<------>unsigned int section_index = NETVSC_INVALID_INDEX;
<------>struct multi_send_data *msdp;
<------>struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
<------>struct sk_buff *msd_skb = NULL;
<------>bool try_batch, xmit_more;
 
<------>/* If device is rescinded, return error and packet will get dropped. */
<------>if (unlikely(!net_device || net_device->destroy))
<------><------>return -ENODEV;
 
<------>nvchan = &net_device->chan_table[packet->q_idx];
<------>packet->send_buf_index = NETVSC_INVALID_INDEX;
<------>packet->cp_partial = false;
 
<------>/* Send a control message or XDP packet directly without accessing
<------> * msd (Multi-Send Data) field which may be changed during data packet
<------> * processing.
<------> */
<------>if (!skb || xdp_tx)
<------><------>return netvsc_send_pkt(device, packet, net_device, pb, skb);
 
<------>/* batch packets in send buffer if possible */
<------>msdp = &nvchan->msd;
<------>if (msdp->pkt)
<------><------>msd_len = msdp->pkt->total_data_buflen;
 
<------>try_batch =  msd_len > 0 && msdp->count < net_device->max_pkt;
<------>if (try_batch && msd_len + pktlen + net_device->pkt_align <
<------>    net_device->send_section_size) {
<------><------>section_index = msdp->pkt->send_buf_index;
 
<------>} else if (try_batch && msd_len + packet->rmsg_size <
<------><------>   net_device->send_section_size) {
<------><------>section_index = msdp->pkt->send_buf_index;
<------><------>packet->cp_partial = true;
 
<------>} else if (pktlen + net_device->pkt_align <
<------><------>   net_device->send_section_size) {
<------><------>section_index = netvsc_get_next_send_section(net_device);
<------><------>if (unlikely(section_index == NETVSC_INVALID_INDEX)) {
<------><------><------>++ndev_ctx->eth_stats.tx_send_full;
<------><------>} else {
<------><------><------>move_pkt_msd(&msd_send, &msd_skb, msdp);
<------><------><------>msd_len = 0;
<------><------>}
<------>}
 
<------>/* Keep aggregating only if stack says more data is coming
<------> * and not doing mixed modes send and not flow blocked
<------> */
<------>xmit_more = netdev_xmit_more() &&
<------><------>!packet->cp_partial &&
<------><------>!netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx));
 
<------>if (section_index != NETVSC_INVALID_INDEX) {
<------><------>netvsc_copy_to_send_buf(net_device,
<------><------><------><------><------>section_index, msd_len,
<------><------><------><------><------>packet, rndis_msg, pb, xmit_more);
 
<------><------>packet->send_buf_index = section_index;
 
<------><------>if (packet->cp_partial) {
<------><------><------>packet->page_buf_cnt -= packet->rmsg_pgcnt;
<------><------><------>packet->total_data_buflen = msd_len + packet->rmsg_size;
<------><------>} else {
<------><------><------>packet->page_buf_cnt = 0;
<------><------><------>packet->total_data_buflen += msd_len;
<------><------>}
 
<------><------>if (msdp->pkt) {
<------><------><------>packet->total_packets += msdp->pkt->total_packets;
<------><------><------>packet->total_bytes += msdp->pkt->total_bytes;
<------><------>}
 
<------><------>if (msdp->skb)
<------><------><------>dev_consume_skb_any(msdp->skb);
 
<------><------>if (xmit_more) {
<------><------><------>msdp->skb = skb;
<------><------><------>msdp->pkt = packet;
<------><------><------>msdp->count++;
<------><------>} else {
<------><------><------>cur_send = packet;
<------><------><------>msdp->skb = NULL;
<------><------><------>msdp->pkt = NULL;
<------><------><------>msdp->count = 0;
<------><------>}
<------>} else {
<------><------>move_pkt_msd(&msd_send, &msd_skb, msdp);
<------><------>cur_send = packet;
<------>}
 
<------>if (msd_send) {
<------><------>int m_ret = netvsc_send_pkt(device, msd_send, net_device,
<------><------><------><------><------>    NULL, msd_skb);
 
<------><------>if (m_ret != 0) {
<------><------><------>netvsc_free_send_slot(net_device,
<------><------><------><------><------>      msd_send->send_buf_index);
<------><------><------>dev_kfree_skb_any(msd_skb);
<------><------>}
<------>}
 
<------>if (cur_send)
<------><------>ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb);
 
<------>if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
<------><------>netvsc_free_send_slot(net_device, section_index);
 
<------>return ret;
}
 
/* Send pending recv completions */
static int send_recv_completions(struct net_device *ndev,
<------><------><------><------> struct netvsc_device *nvdev,
<------><------><------><------> struct netvsc_channel *nvchan)
{
<------>struct multi_recv_comp *mrc = &nvchan->mrc;
<------>struct recv_comp_msg {
<------><------>struct nvsp_message_header hdr;
<------><------>u32 status;
<------>}  __packed;
<------>struct recv_comp_msg msg = {
<------><------>.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE,
<------>};
<------>int ret;
 
<------>while (mrc->first != mrc->next) {
<------><------>const struct recv_comp_data *rcd
<------><------><------>= mrc->slots + mrc->first;
 
<------><------>msg.status = rcd->status;
<------><------>ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg),
<------><------><------><------>       rcd->tid, VM_PKT_COMP, 0);
<------><------>if (unlikely(ret)) {
<------><------><------>struct net_device_context *ndev_ctx = netdev_priv(ndev);
 
<------><------><------>++ndev_ctx->eth_stats.rx_comp_busy;
<------><------><------>return ret;
<------><------>}
 
<------><------>if (++mrc->first == nvdev->recv_completion_cnt)
<------><------><------>mrc->first = 0;
<------>}
 
<------>/* receive completion ring has been emptied */
<------>if (unlikely(nvdev->destroy))
<------><------>wake_up(&nvdev->wait_drain);
 
<------>return 0;
}
 
/* Count how many receive completions are outstanding */
static void recv_comp_slot_avail(const struct netvsc_device *nvdev,
<------><------><------><------> const struct multi_recv_comp *mrc,
<------><------><------><------> u32 *filled, u32 *avail)
{
<------>u32 count = nvdev->recv_completion_cnt;
 
<------>if (mrc->next >= mrc->first)
<------><------>*filled = mrc->next - mrc->first;
<------>else
<------><------>*filled = (count - mrc->first) + mrc->next;
 
<------>*avail = count - *filled - 1;
}
 
/* Add receive complete to ring to send to host. */
static void enq_receive_complete(struct net_device *ndev,
<------><------><------><------> struct netvsc_device *nvdev, u16 q_idx,
<------><------><------><------> u64 tid, u32 status)
{
<------>struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx];
<------>struct multi_recv_comp *mrc = &nvchan->mrc;
<------>struct recv_comp_data *rcd;
<------>u32 filled, avail;
 
<------>recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
 
<------>if (unlikely(filled > NAPI_POLL_WEIGHT)) {
<------><------>send_recv_completions(ndev, nvdev, nvchan);
<------><------>recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
<------>}
 
<------>if (unlikely(!avail)) {
<------><------>netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n",
<------><------><------>   q_idx, tid);
<------><------>return;
<------>}
 
<------>rcd = mrc->slots + mrc->next;
<------>rcd->tid = tid;
<------>rcd->status = status;
 
<------>if (++mrc->next == nvdev->recv_completion_cnt)
<------><------>mrc->next = 0;
}
 
static int netvsc_receive(struct net_device *ndev,
<------><------><------>  struct netvsc_device *net_device,
<------><------><------>  struct netvsc_channel *nvchan,
<------><------><------>  const struct vmpacket_descriptor *desc)
{
<------>struct net_device_context *net_device_ctx = netdev_priv(ndev);
<------>struct vmbus_channel *channel = nvchan->channel;
<------>const struct vmtransfer_page_packet_header *vmxferpage_packet
<------><------>= container_of(desc, const struct vmtransfer_page_packet_header, d);
<------>const struct nvsp_message *nvsp = hv_pkt_data(desc);
<------>u32 msglen = hv_pkt_datalen(desc);
<------>u16 q_idx = channel->offermsg.offer.sub_channel_index;
<------>char *recv_buf = net_device->recv_buf;
<------>u32 status = NVSP_STAT_SUCCESS;
<------>int i;
<------>int count = 0;
 
<------>/* Ensure packet is big enough to read header fields */
<------>if (msglen < sizeof(struct nvsp_message_header)) {
<------><------>netif_err(net_device_ctx, rx_err, ndev,
<------><------><------>  "invalid nvsp header, length too small: %u\n",
<------><------><------>  msglen);
<------><------>return 0;
<------>}
 
<------>/* Make sure this is a valid nvsp packet */
<------>if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) {
<------><------>netif_err(net_device_ctx, rx_err, ndev,
<------><------><------>  "Unknown nvsp packet type received %u\n",
<------><------><------>  nvsp->hdr.msg_type);
<------><------>return 0;
<------>}
 
<------>/* Validate xfer page pkt header */
<------>if ((desc->offset8 << 3) < sizeof(struct vmtransfer_page_packet_header)) {
<------><------>netif_err(net_device_ctx, rx_err, ndev,
<------><------><------>  "Invalid xfer page pkt, offset too small: %u\n",
<------><------><------>  desc->offset8 << 3);
<------><------>return 0;
<------>}
 
<------>if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) {
<------><------>netif_err(net_device_ctx, rx_err, ndev,
<------><------><------>  "Invalid xfer page set id - expecting %x got %x\n",
<------><------><------>  NETVSC_RECEIVE_BUFFER_ID,
<------><------><------>  vmxferpage_packet->xfer_pageset_id);
<------><------>return 0;
<------>}
 
<------>count = vmxferpage_packet->range_cnt;
 
<------>/* Check count for a valid value */
<------>if (NETVSC_XFER_HEADER_SIZE(count) > desc->offset8 << 3) {
<------><------>netif_err(net_device_ctx, rx_err, ndev,
<------><------><------>  "Range count is not valid: %d\n",
<------><------><------>  count);
<------><------>return 0;
<------>}
 
<------>/* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
<------>for (i = 0; i < count; i++) {
<------><------>u32 offset = vmxferpage_packet->ranges[i].byte_offset;
<------><------>u32 buflen = vmxferpage_packet->ranges[i].byte_count;
<------><------>void *data;
<------><------>int ret;
 
<------><------>if (unlikely(offset > net_device->recv_buf_size ||
<------><------><------>     buflen > net_device->recv_buf_size - offset)) {
<------><------><------>nvchan->rsc.cnt = 0;
<------><------><------>status = NVSP_STAT_FAIL;
<------><------><------>netif_err(net_device_ctx, rx_err, ndev,
<------><------><------><------>  "Packet offset:%u + len:%u too big\n",
<------><------><------><------>  offset, buflen);
 
<------><------><------>continue;
<------><------>}
 
<------><------>data = recv_buf + offset;
 
<------><------>nvchan->rsc.is_last = (i == count - 1);
 
<------><------>trace_rndis_recv(ndev, q_idx, data);
 
<------><------>/* Pass it to the upper layer */
<------><------>ret = rndis_filter_receive(ndev, net_device,
<------><------><------><------><------>   nvchan, data, buflen);
 
<------><------>if (unlikely(ret != NVSP_STAT_SUCCESS)) {
<------><------><------>/* Drop incomplete packet */
<------><------><------>nvchan->rsc.cnt = 0;
<------><------><------>status = NVSP_STAT_FAIL;
<------><------>}
<------>}
 
<------>enq_receive_complete(ndev, net_device, q_idx,
<------><------><------>     vmxferpage_packet->d.trans_id, status);
 
<------>return count;
}
 
static void netvsc_send_table(struct net_device *ndev,
<------><------><------>      struct netvsc_device *nvscdev,
<------><------><------>      const struct nvsp_message *nvmsg,
<------><------><------>      u32 msglen)
{
<------>struct net_device_context *net_device_ctx = netdev_priv(ndev);
<------>u32 count, offset, *tab;
<------>int i;
 
<------>/* Ensure packet is big enough to read send_table fields */
<------>if (msglen < sizeof(struct nvsp_message_header) +
<------><------>     sizeof(struct nvsp_5_send_indirect_table)) {
<------><------>netdev_err(ndev, "nvsp_v5_msg length too small: %u\n", msglen);
<------><------>return;
<------>}
 
<------>count = nvmsg->msg.v5_msg.send_table.count;
<------>offset = nvmsg->msg.v5_msg.send_table.offset;
 
<------>if (count != VRSS_SEND_TAB_SIZE) {
<------><------>netdev_err(ndev, "Received wrong send-table size:%u\n", count);
<------><------>return;
<------>}
 
<------>/* If negotiated version <= NVSP_PROTOCOL_VERSION_6, the offset may be
<------> * wrong due to a host bug. So fix the offset here.
<------> */
<------>if (nvscdev->nvsp_version <= NVSP_PROTOCOL_VERSION_6 &&
<------>    msglen >= sizeof(struct nvsp_message_header) +
<------>    sizeof(union nvsp_6_message_uber) + count * sizeof(u32))
<------><------>offset = sizeof(struct nvsp_message_header) +
<------><------><------> sizeof(union nvsp_6_message_uber);
 
<------>/* Boundary check for all versions */
<------>if (offset > msglen - count * sizeof(u32)) {
<------><------>netdev_err(ndev, "Received send-table offset too big:%u\n",
<------><------><------>   offset);
<------><------>return;
<------>}
 
<------>tab = (void *)nvmsg + offset;
 
<------>for (i = 0; i < count; i++)
<------><------>net_device_ctx->tx_table[i] = tab[i];
}
 
static void netvsc_send_vf(struct net_device *ndev,
<------><------><------>   const struct nvsp_message *nvmsg,
<------><------><------>   u32 msglen)
{
<------>struct net_device_context *net_device_ctx = netdev_priv(ndev);
 
<------>/* Ensure packet is big enough to read its fields */
<------>if (msglen < sizeof(struct nvsp_message_header) +
<------><------>     sizeof(struct nvsp_4_send_vf_association)) {
<------><------>netdev_err(ndev, "nvsp_v4_msg length too small: %u\n", msglen);
<------><------>return;
<------>}
 
<------>net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
<------>net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
<------>netdev_info(ndev, "VF slot %u %s\n",
<------><------>    net_device_ctx->vf_serial,
<------><------>    net_device_ctx->vf_alloc ? "added" : "removed");
}
 
static void netvsc_receive_inband(struct net_device *ndev,
<------><------><------><------>  struct netvsc_device *nvscdev,
<------><------><------><------>  const struct vmpacket_descriptor *desc)
{
<------>const struct nvsp_message *nvmsg = hv_pkt_data(desc);
<------>u32 msglen = hv_pkt_datalen(desc);
 
<------>/* Ensure packet is big enough to read header fields */
<------>if (msglen < sizeof(struct nvsp_message_header)) {
<------><------>netdev_err(ndev, "inband nvsp_message length too small: %u\n", msglen);
<------><------>return;
<------>}
 
<------>switch (nvmsg->hdr.msg_type) {
<------>case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
<------><------>netvsc_send_table(ndev, nvscdev, nvmsg, msglen);
<------><------>break;
 
<------>case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
<------><------>netvsc_send_vf(ndev, nvmsg, msglen);
<------><------>break;
<------>}
}
 
static int netvsc_process_raw_pkt(struct hv_device *device,
<------><------><------><------>  struct netvsc_channel *nvchan,
<------><------><------><------>  struct netvsc_device *net_device,
<------><------><------><------>  struct net_device *ndev,
<------><------><------><------>  const struct vmpacket_descriptor *desc,
<------><------><------><------>  int budget)
{
<------>struct vmbus_channel *channel = nvchan->channel;
<------>const struct nvsp_message *nvmsg = hv_pkt_data(desc);
 
<------>trace_nvsp_recv(ndev, channel, nvmsg);
 
<------>switch (desc->type) {
<------>case VM_PKT_COMP:
<------><------>netvsc_send_completion(ndev, net_device, channel, desc, budget);
<------><------>break;
 
<------>case VM_PKT_DATA_USING_XFER_PAGES:
<------><------>return netvsc_receive(ndev, net_device, nvchan, desc);
<------><------>break;
 
<------>case VM_PKT_DATA_INBAND:
<------><------>netvsc_receive_inband(ndev, net_device, desc);
<------><------>break;
 
<------>default:
<------><------>netdev_err(ndev, "unhandled packet type %d, tid %llx\n",
<------><------><------>   desc->type, desc->trans_id);
<------><------>break;
<------>}
 
<------>return 0;
}
 
static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel)
{
<------>struct vmbus_channel *primary = channel->primary_channel;
 
<------>return primary ? primary->device_obj : channel->device_obj;
}
 
/* Network processing softirq
 * Process data in incoming ring buffer from host
 * Stops when ring is empty or budget is met or exceeded.
 */
int netvsc_poll(struct napi_struct *napi, int budget)
{
<------>struct netvsc_channel *nvchan
<------><------>= container_of(napi, struct netvsc_channel, napi);
<------>struct netvsc_device *net_device = nvchan->net_device;
<------>struct vmbus_channel *channel = nvchan->channel;
<------>struct hv_device *device = netvsc_channel_to_device(channel);
<------>struct net_device *ndev = hv_get_drvdata(device);
<------>int work_done = 0;
<------>int ret;
 
<------>/* If starting a new interval */
<------>if (!nvchan->desc)
<------><------>nvchan->desc = hv_pkt_iter_first(channel);
 
<------>while (nvchan->desc && work_done < budget) {
<------><------>work_done += netvsc_process_raw_pkt(device, nvchan, net_device,
<------><------><------><------><------><------>    ndev, nvchan->desc, budget);
<------><------>nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc);
<------>}
 
<------>/* Send any pending receive completions */
<------>ret = send_recv_completions(ndev, net_device, nvchan);
 
<------>/* If it did not exhaust NAPI budget this time
<------> *  and not doing busy poll
<------> * then re-enable host interrupts
<------> *  and reschedule if ring is not empty
<------> *   or sending receive completion failed.
<------> */
<------>if (work_done < budget &&
<------>    napi_complete_done(napi, work_done) &&
<------>    (ret || hv_end_read(&channel->inbound)) &&
<------>    napi_schedule_prep(napi)) {
<------><------>hv_begin_read(&channel->inbound);
<------><------>__napi_schedule(napi);
<------>}
 
<------>/* Driver may overshoot since multiple packets per descriptor */
<------>return min(work_done, budget);
}
 
/* Call back when data is available in host ring buffer.
 * Processing is deferred until network softirq (NAPI)
 */
void netvsc_channel_cb(void *context)
{
<------>struct netvsc_channel *nvchan = context;
<------>struct vmbus_channel *channel = nvchan->channel;
<------>struct hv_ring_buffer_info *rbi = &channel->inbound;
 
<------>/* preload first vmpacket descriptor */
<------>prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index);
 
<------>if (napi_schedule_prep(&nvchan->napi)) {
<------><------>/* disable interrupts from host */
<------><------>hv_begin_read(rbi);
 
<------><------>__napi_schedule_irqoff(&nvchan->napi);
<------>}
}
 
/*
 * netvsc_device_add - Callback when the device belonging to this
 * driver is added
 */
struct netvsc_device *netvsc_device_add(struct hv_device *device,
<------><------><------><------>const struct netvsc_device_info *device_info)
{
<------>int i, ret = 0;
<------>struct netvsc_device *net_device;
<------>struct net_device *ndev = hv_get_drvdata(device);
<------>struct net_device_context *net_device_ctx = netdev_priv(ndev);
 
<------>net_device = alloc_net_device();
<------>if (!net_device)
<------><------>return ERR_PTR(-ENOMEM);
 
<------>for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
<------><------>net_device_ctx->tx_table[i] = 0;
 
<------>/* Because the device uses NAPI, all the interrupt batching and
<------> * control is done via Net softirq, not the channel handling
<------> */
<------>set_channel_read_mode(device->channel, HV_CALL_ISR);
 
<------>/* If we're reopening the device we may have multiple queues, fill the
<------> * chn_table with the default channel to use it before subchannels are
<------> * opened.
<------> * Initialize the channel state before we open;
<------> * we can be interrupted as soon as we open the channel.
<------> */
 
<------>for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
<------><------>struct netvsc_channel *nvchan = &net_device->chan_table[i];
 
<------><------>nvchan->channel = device->channel;
<------><------>nvchan->net_device = net_device;
<------><------>u64_stats_init(&nvchan->tx_stats.syncp);
<------><------>u64_stats_init(&nvchan->rx_stats.syncp);
 
<------><------>ret = xdp_rxq_info_reg(&nvchan->xdp_rxq, ndev, i);
 
<------><------>if (ret) {
<------><------><------>netdev_err(ndev, "xdp_rxq_info_reg fail: %d\n", ret);
<------><------><------>goto cleanup2;
<------><------>}
 
<------><------>ret = xdp_rxq_info_reg_mem_model(&nvchan->xdp_rxq,
<------><------><------><------><------><------> MEM_TYPE_PAGE_SHARED, NULL);
 
<------><------>if (ret) {
<------><------><------>netdev_err(ndev, "xdp reg_mem_model fail: %d\n", ret);
<------><------><------>goto cleanup2;
<------><------>}
<------>}
 
<------>/* Enable NAPI handler before init callbacks */
<------>netif_napi_add(ndev, &net_device->chan_table[0].napi,
<------><------>       netvsc_poll, NAPI_POLL_WEIGHT);
 
<------>/* Open the channel */
<------>ret = vmbus_open(device->channel, netvsc_ring_bytes,
<------><------><------> netvsc_ring_bytes,  NULL, 0,
<------><------><------> netvsc_channel_cb, net_device->chan_table);
 
<------>if (ret != 0) {
<------><------>netdev_err(ndev, "unable to open channel: %d\n", ret);
<------><------>goto cleanup;
<------>}
 
<------>/* Channel is opened */
<------>netdev_dbg(ndev, "hv_netvsc channel opened successfully\n");
 
<------>napi_enable(&net_device->chan_table[0].napi);
 
<------>/* Connect with the NetVsp */
<------>ret = netvsc_connect_vsp(device, net_device, device_info);
<------>if (ret != 0) {
<------><------>netdev_err(ndev,
<------><------><------>"unable to connect to NetVSP - %d\n", ret);
<------><------>goto close;
<------>}
 
<------>/* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is
<------> * populated.
<------> */
<------>rcu_assign_pointer(net_device_ctx->nvdev, net_device);
 
<------>return net_device;
 
close:
<------>RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
<------>napi_disable(&net_device->chan_table[0].napi);
 
<------>/* Now, we can close the channel safely */
<------>vmbus_close(device->channel);
 
cleanup:
<------>netif_napi_del(&net_device->chan_table[0].napi);
 
cleanup2:
<------>free_netvsc_device(&net_device->rcu);
 
<------>return ERR_PTR(ret);
}