v4.19.13 snapshot.
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
new file mode 100644
index 0000000..fe01e14
--- /dev/null
+++ b/drivers/net/hyperv/netvsc.c
@@ -0,0 +1,1419 @@
+/*
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * 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);
+ 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->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++)
+ 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;
+
+ /* Setup receive completion ring */
+ net_device->recv_completion_cnt
+ = round_up(net_device->recv_section_cnt + 1,
+ PAGE_SIZE / sizeof(u64));
+ 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;
+
+ /* 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;
+ }
+
+ 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);
+
+ /* And disassociate NAPI context from device */
+ for (i = 0; i < net_device->num_chn; i++)
+ 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) &&
+ (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);
+
+ switch (nvsp_packet->hdr.msg_type) {
+ case NVSP_MSG_TYPE_INIT_COMPLETE:
+ case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE:
+ case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE:
+ case NVSP_MSG5_TYPE_SUBCHANNEL:
+ /* 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 << 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++;
+ if (atomic_read(&nvchan->queue_sends) < 1) {
+ netif_tx_wake_queue(txq);
+ ndev_ctx->eth_stats.wake_queue++;
+ ret = -ENOSPC;
+ }
+ } else {
+ netdev_err(ndev,
+ "Unable to send packet pages %u len %u, ret %d\n",
+ packet->page_buf_cnt, packet->total_data_buflen,
+ ret);
+ }
+
+ 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)
+{
+ 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 control message directly without accessing msd (Multi-Send
+ * Data) field which may be changed during data packet processing.
+ */
+ if (!skb)
+ 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 = skb->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 vmbus_channel *channel,
+ const struct vmpacket_descriptor *desc,
+ const struct nvsp_message *nvsp)
+{
+ struct net_device_context *net_device_ctx = netdev_priv(ndev);
+ const struct vmtransfer_page_packet_header *vmxferpage_packet
+ = container_of(desc, const struct vmtransfer_page_packet_header, d);
+ 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;
+
+ /* 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;
+ }
+
+ 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;
+
+ /* 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 + buflen > net_device->recv_buf_size)) {
+ 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;
+
+ trace_rndis_recv(ndev, q_idx, data);
+
+ /* Pass it to the upper layer */
+ ret = rndis_filter_receive(ndev, net_device,
+ channel, data, buflen);
+
+ if (unlikely(ret != NVSP_STAT_SUCCESS))
+ 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,
+ const struct nvsp_message *nvmsg)
+{
+ struct net_device_context *net_device_ctx = netdev_priv(ndev);
+ u32 count, *tab;
+ int i;
+
+ count = nvmsg->msg.v5_msg.send_table.count;
+ if (count != VRSS_SEND_TAB_SIZE) {
+ netdev_err(ndev, "Received wrong send-table size:%u\n", count);
+ return;
+ }
+
+ tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table +
+ nvmsg->msg.v5_msg.send_table.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)
+{
+ struct net_device_context *net_device_ctx = netdev_priv(ndev);
+
+ 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,
+ const struct nvsp_message *nvmsg)
+{
+ switch (nvmsg->hdr.msg_type) {
+ case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
+ netvsc_send_table(ndev, nvmsg);
+ break;
+
+ case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
+ netvsc_send_vf(ndev, nvmsg);
+ break;
+ }
+}
+
+static int netvsc_process_raw_pkt(struct hv_device *device,
+ struct vmbus_channel *channel,
+ struct netvsc_device *net_device,
+ struct net_device *ndev,
+ const struct vmpacket_descriptor *desc,
+ int budget)
+{
+ 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, channel,
+ desc, nvmsg);
+ break;
+
+ case VM_PKT_DATA_INBAND:
+ netvsc_receive_inband(ndev, nvmsg);
+ 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, channel, 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 interupts 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);
+ }
+
+ /* 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);
+ free_netvsc_device(&net_device->rcu);
+
+ return ERR_PTR(ret);
+}