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path: root/drivers/net/hyperv/netvsc.c
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Diffstat (limited to 'drivers/net/hyperv/netvsc.c')
-rw-r--r--drivers/net/hyperv/netvsc.c932
1 files changed, 932 insertions, 0 deletions
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
new file mode 100644
index 00000000000..8965b45ce5a
--- /dev/null
+++ b/drivers/net/hyperv/netvsc.c
@@ -0,0 +1,932 @@
+/*
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ * Haiyang Zhang <haiyangz@microsoft.com>
+ * Hank Janssen <hjanssen@microsoft.com>
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/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 "hyperv_net.h"
+
+
+static struct netvsc_device *alloc_net_device(struct hv_device *device)
+{
+ struct netvsc_device *net_device;
+ struct net_device *ndev = hv_get_drvdata(device);
+
+ net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
+ if (!net_device)
+ return NULL;
+
+ net_device->start_remove = false;
+ net_device->destroy = false;
+ net_device->dev = device;
+ net_device->ndev = ndev;
+
+ hv_set_drvdata(device, net_device);
+ return net_device;
+}
+
+static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
+{
+ struct netvsc_device *net_device;
+
+ net_device = hv_get_drvdata(device);
+ if (net_device && net_device->destroy)
+ net_device = NULL;
+
+ return net_device;
+}
+
+static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
+{
+ struct netvsc_device *net_device;
+
+ net_device = hv_get_drvdata(device);
+
+ if (!net_device)
+ goto get_in_err;
+
+ if (net_device->destroy &&
+ atomic_read(&net_device->num_outstanding_sends) == 0)
+ net_device = NULL;
+
+get_in_err:
+ return net_device;
+}
+
+
+static int netvsc_destroy_recv_buf(struct netvsc_device *net_device)
+{
+ struct nvsp_message *revoke_packet;
+ int ret = 0;
+ struct net_device *ndev = net_device->ndev;
+
+ /*
+ * 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;
+
+ ret = vmbus_sendpacket(net_device->dev->channel,
+ revoke_packet,
+ sizeof(struct nvsp_message),
+ (unsigned long)revoke_packet,
+ VM_PKT_DATA_INBAND, 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 ret;
+ }
+ }
+
+ /* Teardown the gpadl on the vsp end */
+ if (net_device->recv_buf_gpadl_handle) {
+ ret = vmbus_teardown_gpadl(net_device->dev->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 ret;
+ }
+ net_device->recv_buf_gpadl_handle = 0;
+ }
+
+ if (net_device->recv_buf) {
+ /* Free up the receive buffer */
+ free_pages((unsigned long)net_device->recv_buf,
+ get_order(net_device->recv_buf_size));
+ net_device->recv_buf = NULL;
+ }
+
+ if (net_device->recv_section) {
+ net_device->recv_section_cnt = 0;
+ kfree(net_device->recv_section);
+ net_device->recv_section = NULL;
+ }
+
+ return ret;
+}
+
+static int netvsc_init_recv_buf(struct hv_device *device)
+{
+ int ret = 0;
+ int t;
+ struct netvsc_device *net_device;
+ struct nvsp_message *init_packet;
+ struct net_device *ndev;
+
+ net_device = get_outbound_net_device(device);
+ if (!net_device)
+ return -ENODEV;
+ ndev = net_device->ndev;
+
+ net_device->recv_buf =
+ (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
+ get_order(net_device->recv_buf_size));
+ if (!net_device->recv_buf) {
+ netdev_err(ndev, "unable to allocate receive "
+ "buffer of size %d\n", net_device->recv_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->recv_buf,
+ net_device->recv_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;
+
+ /* 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;
+ }
+
+ t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
+ BUG_ON(t == 0);
+
+
+ /* Check the response */
+ if (init_packet->msg.v1_msg.
+ send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
+ netdev_err(ndev, "Unable to complete receive buffer "
+ "initialization with NetVsp - status %d\n",
+ init_packet->msg.v1_msg.
+ send_recv_buf_complete.status);
+ ret = -EINVAL;
+ goto cleanup;
+ }
+
+ /* Parse the response */
+
+ net_device->recv_section_cnt = init_packet->msg.
+ v1_msg.send_recv_buf_complete.num_sections;
+
+ net_device->recv_section = kmemdup(
+ init_packet->msg.v1_msg.send_recv_buf_complete.sections,
+ net_device->recv_section_cnt *
+ sizeof(struct nvsp_1_receive_buffer_section),
+ GFP_KERNEL);
+ if (net_device->recv_section == NULL) {
+ ret = -EINVAL;
+ goto cleanup;
+ }
+
+ /*
+ * For 1st release, there should only be 1 section that represents the
+ * entire receive buffer
+ */
+ if (net_device->recv_section_cnt != 1 ||
+ net_device->recv_section->offset != 0) {
+ ret = -EINVAL;
+ goto cleanup;
+ }
+
+ goto exit;
+
+cleanup:
+ netvsc_destroy_recv_buf(net_device);
+
+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)
+{
+ int ret, t;
+
+ 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;
+
+ /* 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;
+
+ t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
+
+ if (t == 0)
+ return -ETIMEDOUT;
+
+ if (init_packet->msg.init_msg.init_complete.status !=
+ NVSP_STAT_SUCCESS)
+ return -EINVAL;
+
+ if (nvsp_ver != NVSP_PROTOCOL_VERSION_2)
+ return 0;
+
+ /* NVSPv2 only: 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 = net_device->ndev->mtu;
+
+ 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)
+{
+ int ret;
+ struct netvsc_device *net_device;
+ struct nvsp_message *init_packet;
+ int ndis_version;
+ struct net_device *ndev;
+
+ net_device = get_outbound_net_device(device);
+ if (!net_device)
+ return -ENODEV;
+ ndev = net_device->ndev;
+
+ init_packet = &net_device->channel_init_pkt;
+
+ /* Negotiate the latest NVSP protocol supported */
+ if (negotiate_nvsp_ver(device, net_device, init_packet,
+ NVSP_PROTOCOL_VERSION_2) == 0) {
+ net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2;
+ } else if (negotiate_nvsp_ver(device, net_device, init_packet,
+ NVSP_PROTOCOL_VERSION_1) == 0) {
+ net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1;
+ } else {
+ 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));
+
+ ndis_version = 0x00050000;
+
+ 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;
+
+ /* 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;
+
+ /* Post the big receive buffer to NetVSP */
+ ret = netvsc_init_recv_buf(device);
+
+cleanup:
+ return ret;
+}
+
+static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
+{
+ netvsc_destroy_recv_buf(net_device);
+}
+
+/*
+ * netvsc_device_remove - Callback when the root bus device is removed
+ */
+int netvsc_device_remove(struct hv_device *device)
+{
+ struct netvsc_device *net_device;
+ struct hv_netvsc_packet *netvsc_packet, *pos;
+ unsigned long flags;
+
+ net_device = hv_get_drvdata(device);
+ spin_lock_irqsave(&device->channel->inbound_lock, flags);
+ net_device->destroy = true;
+ spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
+
+ /* Wait for all send completions */
+ while (atomic_read(&net_device->num_outstanding_sends)) {
+ dev_info(&device->device,
+ "waiting for %d requests to complete...\n",
+ atomic_read(&net_device->num_outstanding_sends));
+ udelay(100);
+ }
+
+ netvsc_disconnect_vsp(net_device);
+
+ /*
+ * Since we have already drained, we don't need to busy wait
+ * as was done in final_release_stor_device()
+ * Note that we cannot set the ext pointer to NULL until
+ * we have drained - to drain the outgoing packets, we need to
+ * allow incoming packets.
+ */
+
+ spin_lock_irqsave(&device->channel->inbound_lock, flags);
+ hv_set_drvdata(device, NULL);
+ spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
+
+ /*
+ * At this point, no one should be accessing net_device
+ * except in here
+ */
+ dev_notice(&device->device, "net device safe to remove\n");
+
+ /* Now, we can close the channel safely */
+ vmbus_close(device->channel);
+
+ /* Release all resources */
+ list_for_each_entry_safe(netvsc_packet, pos,
+ &net_device->recv_pkt_list, list_ent) {
+ list_del(&netvsc_packet->list_ent);
+ kfree(netvsc_packet);
+ }
+
+ kfree(net_device);
+ return 0;
+}
+
+static void netvsc_send_completion(struct hv_device *device,
+ struct vmpacket_descriptor *packet)
+{
+ struct netvsc_device *net_device;
+ struct nvsp_message *nvsp_packet;
+ struct hv_netvsc_packet *nvsc_packet;
+ struct net_device *ndev;
+
+ net_device = get_inbound_net_device(device);
+ if (!net_device)
+ return;
+ ndev = net_device->ndev;
+
+ nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
+ (packet->offset8 << 3));
+
+ if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
+ (nvsp_packet->hdr.msg_type ==
+ NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
+ (nvsp_packet->hdr.msg_type ==
+ NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) {
+ /* Copy the response back */
+ memcpy(&net_device->channel_init_pkt, nvsp_packet,
+ sizeof(struct nvsp_message));
+ complete(&net_device->channel_init_wait);
+ } else if (nvsp_packet->hdr.msg_type ==
+ NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
+ /* Get the send context */
+ nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
+ packet->trans_id;
+
+ /* Notify the layer above us */
+ nvsc_packet->completion.send.send_completion(
+ nvsc_packet->completion.send.send_completion_ctx);
+
+ atomic_dec(&net_device->num_outstanding_sends);
+
+ if (netif_queue_stopped(ndev) && !net_device->start_remove)
+ netif_wake_queue(ndev);
+ } else {
+ netdev_err(ndev, "Unknown send completion packet type- "
+ "%d received!!\n", nvsp_packet->hdr.msg_type);
+ }
+
+}
+
+int netvsc_send(struct hv_device *device,
+ struct hv_netvsc_packet *packet)
+{
+ struct netvsc_device *net_device;
+ int ret = 0;
+ struct nvsp_message sendMessage;
+ struct net_device *ndev;
+
+ net_device = get_outbound_net_device(device);
+ if (!net_device)
+ return -ENODEV;
+ ndev = net_device->ndev;
+
+ sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
+ if (packet->is_data_pkt) {
+ /* 0 is RMC_DATA; */
+ sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0;
+ } else {
+ /* 1 is RMC_CONTROL; */
+ sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1;
+ }
+
+ /* Not using send buffer section */
+ sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
+ 0xFFFFFFFF;
+ sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
+
+ if (packet->page_buf_cnt) {
+ ret = vmbus_sendpacket_pagebuffer(device->channel,
+ packet->page_buf,
+ packet->page_buf_cnt,
+ &sendMessage,
+ sizeof(struct nvsp_message),
+ (unsigned long)packet);
+ } else {
+ ret = vmbus_sendpacket(device->channel, &sendMessage,
+ sizeof(struct nvsp_message),
+ (unsigned long)packet,
+ VM_PKT_DATA_INBAND,
+ VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
+
+ }
+
+ if (ret == 0) {
+ atomic_inc(&net_device->num_outstanding_sends);
+ } else if (ret == -EAGAIN) {
+ netif_stop_queue(ndev);
+ if (atomic_read(&net_device->num_outstanding_sends) < 1)
+ netif_wake_queue(ndev);
+ } else {
+ netdev_err(ndev, "Unable to send packet %p ret %d\n",
+ packet, ret);
+ }
+
+ return ret;
+}
+
+static void netvsc_send_recv_completion(struct hv_device *device,
+ u64 transaction_id)
+{
+ struct nvsp_message recvcompMessage;
+ int retries = 0;
+ int ret;
+ struct net_device *ndev;
+ struct netvsc_device *net_device = hv_get_drvdata(device);
+
+ ndev = net_device->ndev;
+
+ recvcompMessage.hdr.msg_type =
+ NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
+
+ /* FIXME: Pass in the status */
+ recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status =
+ NVSP_STAT_SUCCESS;
+
+retry_send_cmplt:
+ /* Send the completion */
+ ret = vmbus_sendpacket(device->channel, &recvcompMessage,
+ sizeof(struct nvsp_message), transaction_id,
+ VM_PKT_COMP, 0);
+ if (ret == 0) {
+ /* success */
+ /* no-op */
+ } else if (ret == -EAGAIN) {
+ /* no more room...wait a bit and attempt to retry 3 times */
+ retries++;
+ netdev_err(ndev, "unable to send receive completion pkt"
+ " (tid %llx)...retrying %d\n", transaction_id, retries);
+
+ if (retries < 4) {
+ udelay(100);
+ goto retry_send_cmplt;
+ } else {
+ netdev_err(ndev, "unable to send receive "
+ "completion pkt (tid %llx)...give up retrying\n",
+ transaction_id);
+ }
+ } else {
+ netdev_err(ndev, "unable to send receive "
+ "completion pkt - %llx\n", transaction_id);
+ }
+}
+
+/* Send a receive completion packet to RNDIS device (ie NetVsp) */
+static void netvsc_receive_completion(void *context)
+{
+ struct hv_netvsc_packet *packet = context;
+ struct hv_device *device = (struct hv_device *)packet->device;
+ struct netvsc_device *net_device;
+ u64 transaction_id = 0;
+ bool fsend_receive_comp = false;
+ unsigned long flags;
+ struct net_device *ndev;
+
+ /*
+ * Even though it seems logical to do a GetOutboundNetDevice() here to
+ * send out receive completion, we are using GetInboundNetDevice()
+ * since we may have disable outbound traffic already.
+ */
+ net_device = get_inbound_net_device(device);
+ if (!net_device)
+ return;
+ ndev = net_device->ndev;
+
+ /* Overloading use of the lock. */
+ spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
+
+ packet->xfer_page_pkt->count--;
+
+ /*
+ * Last one in the line that represent 1 xfer page packet.
+ * Return the xfer page packet itself to the freelist
+ */
+ if (packet->xfer_page_pkt->count == 0) {
+ fsend_receive_comp = true;
+ transaction_id = packet->completion.recv.recv_completion_tid;
+ list_add_tail(&packet->xfer_page_pkt->list_ent,
+ &net_device->recv_pkt_list);
+
+ }
+
+ /* Put the packet back */
+ list_add_tail(&packet->list_ent, &net_device->recv_pkt_list);
+ spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
+
+ /* Send a receive completion for the xfer page packet */
+ if (fsend_receive_comp)
+ netvsc_send_recv_completion(device, transaction_id);
+
+}
+
+static void netvsc_receive(struct hv_device *device,
+ struct vmpacket_descriptor *packet)
+{
+ struct netvsc_device *net_device;
+ struct vmtransfer_page_packet_header *vmxferpage_packet;
+ struct nvsp_message *nvsp_packet;
+ struct hv_netvsc_packet *netvsc_packet = NULL;
+ /* struct netvsc_driver *netvscDriver; */
+ struct xferpage_packet *xferpage_packet = NULL;
+ int i;
+ int count = 0;
+ unsigned long flags;
+ struct net_device *ndev;
+
+ LIST_HEAD(listHead);
+
+ net_device = get_inbound_net_device(device);
+ if (!net_device)
+ return;
+ ndev = net_device->ndev;
+
+ /*
+ * All inbound packets other than send completion should be xfer page
+ * packet
+ */
+ if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
+ netdev_err(ndev, "Unknown packet type received - %d\n",
+ packet->type);
+ return;
+ }
+
+ nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
+ (packet->offset8 << 3));
+
+ /* Make sure this is a valid nvsp packet */
+ if (nvsp_packet->hdr.msg_type !=
+ NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
+ netdev_err(ndev, "Unknown nvsp packet type received-"
+ " %d\n", nvsp_packet->hdr.msg_type);
+ return;
+ }
+
+ vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
+
+ if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
+ netdev_err(ndev, "Invalid xfer page set id - "
+ "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
+ vmxferpage_packet->xfer_pageset_id);
+ return;
+ }
+
+ /*
+ * Grab free packets (range count + 1) to represent this xfer
+ * page packet. +1 to represent the xfer page packet itself.
+ * We grab it here so that we know exactly how many we can
+ * fulfil
+ */
+ spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
+ while (!list_empty(&net_device->recv_pkt_list)) {
+ list_move_tail(net_device->recv_pkt_list.next, &listHead);
+ if (++count == vmxferpage_packet->range_cnt + 1)
+ break;
+ }
+ spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
+
+ /*
+ * We need at least 2 netvsc pkts (1 to represent the xfer
+ * page and at least 1 for the range) i.e. we can handled
+ * some of the xfer page packet ranges...
+ */
+ if (count < 2) {
+ netdev_err(ndev, "Got only %d netvsc pkt...needed "
+ "%d pkts. Dropping this xfer page packet completely!\n",
+ count, vmxferpage_packet->range_cnt + 1);
+
+ /* Return it to the freelist */
+ spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
+ for (i = count; i != 0; i--) {
+ list_move_tail(listHead.next,
+ &net_device->recv_pkt_list);
+ }
+ spin_unlock_irqrestore(&net_device->recv_pkt_list_lock,
+ flags);
+
+ netvsc_send_recv_completion(device,
+ vmxferpage_packet->d.trans_id);
+
+ return;
+ }
+
+ /* Remove the 1st packet to represent the xfer page packet itself */
+ xferpage_packet = (struct xferpage_packet *)listHead.next;
+ list_del(&xferpage_packet->list_ent);
+
+ /* This is how much we can satisfy */
+ xferpage_packet->count = count - 1;
+
+ if (xferpage_packet->count != vmxferpage_packet->range_cnt) {
+ netdev_err(ndev, "Needed %d netvsc pkts to satisfy "
+ "this xfer page...got %d\n",
+ vmxferpage_packet->range_cnt, xferpage_packet->count);
+ }
+
+ /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
+ for (i = 0; i < (count - 1); i++) {
+ netvsc_packet = (struct hv_netvsc_packet *)listHead.next;
+ list_del(&netvsc_packet->list_ent);
+
+ /* Initialize the netvsc packet */
+ netvsc_packet->xfer_page_pkt = xferpage_packet;
+ netvsc_packet->completion.recv.recv_completion =
+ netvsc_receive_completion;
+ netvsc_packet->completion.recv.recv_completion_ctx =
+ netvsc_packet;
+ netvsc_packet->device = device;
+ /* Save this so that we can send it back */
+ netvsc_packet->completion.recv.recv_completion_tid =
+ vmxferpage_packet->d.trans_id;
+
+ netvsc_packet->data = (void *)((unsigned long)net_device->
+ recv_buf + vmxferpage_packet->ranges[i].byte_offset);
+ netvsc_packet->total_data_buflen =
+ vmxferpage_packet->ranges[i].byte_count;
+
+ /* Pass it to the upper layer */
+ rndis_filter_receive(device, netvsc_packet);
+
+ netvsc_receive_completion(netvsc_packet->
+ completion.recv.recv_completion_ctx);
+ }
+
+}
+
+static void netvsc_channel_cb(void *context)
+{
+ int ret;
+ struct hv_device *device = context;
+ struct netvsc_device *net_device;
+ u32 bytes_recvd;
+ u64 request_id;
+ unsigned char *packet;
+ struct vmpacket_descriptor *desc;
+ unsigned char *buffer;
+ int bufferlen = NETVSC_PACKET_SIZE;
+ struct net_device *ndev;
+
+ packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
+ GFP_ATOMIC);
+ if (!packet)
+ return;
+ buffer = packet;
+
+ net_device = get_inbound_net_device(device);
+ if (!net_device)
+ goto out;
+ ndev = net_device->ndev;
+
+ do {
+ ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen,
+ &bytes_recvd, &request_id);
+ if (ret == 0) {
+ if (bytes_recvd > 0) {
+ desc = (struct vmpacket_descriptor *)buffer;
+ switch (desc->type) {
+ case VM_PKT_COMP:
+ netvsc_send_completion(device, desc);
+ break;
+
+ case VM_PKT_DATA_USING_XFER_PAGES:
+ netvsc_receive(device, desc);
+ break;
+
+ default:
+ netdev_err(ndev,
+ "unhandled packet type %d, "
+ "tid %llx len %d\n",
+ desc->type, request_id,
+ bytes_recvd);
+ break;
+ }
+
+ /* reset */
+ if (bufferlen > NETVSC_PACKET_SIZE) {
+ kfree(buffer);
+ buffer = packet;
+ bufferlen = NETVSC_PACKET_SIZE;
+ }
+ } else {
+ /* reset */
+ if (bufferlen > NETVSC_PACKET_SIZE) {
+ kfree(buffer);
+ buffer = packet;
+ bufferlen = NETVSC_PACKET_SIZE;
+ }
+
+ break;
+ }
+ } else if (ret == -ENOBUFS) {
+ /* Handle large packet */
+ buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
+ if (buffer == NULL) {
+ /* Try again next time around */
+ netdev_err(ndev,
+ "unable to allocate buffer of size "
+ "(%d)!!\n", bytes_recvd);
+ break;
+ }
+
+ bufferlen = bytes_recvd;
+ }
+ } while (1);
+
+out:
+ kfree(buffer);
+ return;
+}
+
+/*
+ * netvsc_device_add - Callback when the device belonging to this
+ * driver is added
+ */
+int netvsc_device_add(struct hv_device *device, void *additional_info)
+{
+ int ret = 0;
+ int i;
+ int ring_size =
+ ((struct netvsc_device_info *)additional_info)->ring_size;
+ struct netvsc_device *net_device;
+ struct hv_netvsc_packet *packet, *pos;
+ struct net_device *ndev;
+
+ net_device = alloc_net_device(device);
+ if (!net_device) {
+ ret = -ENOMEM;
+ goto cleanup;
+ }
+
+ /*
+ * Coming into this function, struct net_device * is
+ * registered as the driver private data.
+ * In alloc_net_device(), we register struct netvsc_device *
+ * as the driver private data and stash away struct net_device *
+ * in struct netvsc_device *.
+ */
+ ndev = net_device->ndev;
+
+ /* Initialize the NetVSC channel extension */
+ net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
+ spin_lock_init(&net_device->recv_pkt_list_lock);
+
+ INIT_LIST_HEAD(&net_device->recv_pkt_list);
+
+ for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) {
+ packet = kzalloc(sizeof(struct hv_netvsc_packet) +
+ (NETVSC_RECEIVE_SG_COUNT *
+ sizeof(struct hv_page_buffer)), GFP_KERNEL);
+ if (!packet)
+ break;
+
+ list_add_tail(&packet->list_ent,
+ &net_device->recv_pkt_list);
+ }
+ init_completion(&net_device->channel_init_wait);
+
+ /* Open the channel */
+ ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
+ ring_size * PAGE_SIZE, NULL, 0,
+ netvsc_channel_cb, device);
+
+ if (ret != 0) {
+ netdev_err(ndev, "unable to open channel: %d\n", ret);
+ goto cleanup;
+ }
+
+ /* Channel is opened */
+ pr_info("hv_netvsc channel opened successfully\n");
+
+ /* Connect with the NetVsp */
+ ret = netvsc_connect_vsp(device);
+ if (ret != 0) {
+ netdev_err(ndev,
+ "unable to connect to NetVSP - %d\n", ret);
+ goto close;
+ }
+
+ return ret;
+
+close:
+ /* Now, we can close the channel safely */
+ vmbus_close(device->channel);
+
+cleanup:
+
+ if (net_device) {
+ list_for_each_entry_safe(packet, pos,
+ &net_device->recv_pkt_list,
+ list_ent) {
+ list_del(&packet->list_ent);
+ kfree(packet);
+ }
+
+ kfree(net_device);
+ }
+
+ return ret;
+}