![KY Srinivasan](/assets/img/avatar_default.png)
We send packets using a copy-free mechanism (this is the Guest to Host transport via VMBUS). While this is obviously optimal for large packets, it may not be optimal for small packets. Hyper-V host supports a second mechanism for sending packets that is "copy based". We implement that mechanism in this patch. In this version of the patch I have addressed a comment from David Miller. With this patch (and all of the other offload and VRSS patches), we are now able to almost saturate a 10G interface between Linux VMs on Hyper-V on different hosts - close to 9 Gbps as measured via iperf. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1103 lines
29 KiB
C
1103 lines
29 KiB
C
/*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/netdevice.h>
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#include <linux/if_ether.h>
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#include <asm/sync_bitops.h>
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#include "hyperv_net.h"
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static struct netvsc_device *alloc_net_device(struct hv_device *device)
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{
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struct netvsc_device *net_device;
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struct net_device *ndev = hv_get_drvdata(device);
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net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
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if (!net_device)
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return NULL;
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init_waitqueue_head(&net_device->wait_drain);
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net_device->start_remove = false;
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net_device->destroy = false;
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net_device->dev = device;
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net_device->ndev = ndev;
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hv_set_drvdata(device, net_device);
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return net_device;
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}
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static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
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{
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struct netvsc_device *net_device;
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net_device = hv_get_drvdata(device);
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if (net_device && net_device->destroy)
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net_device = NULL;
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return net_device;
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}
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static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
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{
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struct netvsc_device *net_device;
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net_device = hv_get_drvdata(device);
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if (!net_device)
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goto get_in_err;
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if (net_device->destroy &&
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atomic_read(&net_device->num_outstanding_sends) == 0)
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net_device = NULL;
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get_in_err:
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return net_device;
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}
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static int netvsc_destroy_buf(struct netvsc_device *net_device)
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{
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struct nvsp_message *revoke_packet;
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int ret = 0;
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struct net_device *ndev = net_device->ndev;
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/*
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* If we got a section count, it means we received a
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* SendReceiveBufferComplete msg (ie sent
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* NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
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* to send a revoke msg here
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*/
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if (net_device->recv_section_cnt) {
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/* Send the revoke receive buffer */
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revoke_packet = &net_device->revoke_packet;
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memset(revoke_packet, 0, sizeof(struct nvsp_message));
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revoke_packet->hdr.msg_type =
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NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
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revoke_packet->msg.v1_msg.
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revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
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ret = vmbus_sendpacket(net_device->dev->channel,
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revoke_packet,
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sizeof(struct nvsp_message),
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(unsigned long)revoke_packet,
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VM_PKT_DATA_INBAND, 0);
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/*
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* If we failed here, we might as well return and
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* have a leak rather than continue and a bugchk
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*/
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if (ret != 0) {
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netdev_err(ndev, "unable to send "
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"revoke receive buffer to netvsp\n");
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return ret;
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}
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}
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/* Teardown the gpadl on the vsp end */
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if (net_device->recv_buf_gpadl_handle) {
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ret = vmbus_teardown_gpadl(net_device->dev->channel,
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net_device->recv_buf_gpadl_handle);
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/* If we failed here, we might as well return and have a leak
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* rather than continue and a bugchk
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*/
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if (ret != 0) {
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netdev_err(ndev,
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"unable to teardown receive buffer's gpadl\n");
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return ret;
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}
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net_device->recv_buf_gpadl_handle = 0;
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}
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if (net_device->recv_buf) {
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/* Free up the receive buffer */
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vfree(net_device->recv_buf);
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net_device->recv_buf = NULL;
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}
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if (net_device->recv_section) {
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net_device->recv_section_cnt = 0;
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kfree(net_device->recv_section);
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net_device->recv_section = NULL;
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}
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/* Deal with the send buffer we may have setup.
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* If we got a send section size, it means we received a
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* SendsendBufferComplete msg (ie sent
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* NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
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* to send a revoke msg here
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*/
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if (net_device->send_section_size) {
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/* Send the revoke receive buffer */
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revoke_packet = &net_device->revoke_packet;
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memset(revoke_packet, 0, sizeof(struct nvsp_message));
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revoke_packet->hdr.msg_type =
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NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
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revoke_packet->msg.v1_msg.revoke_recv_buf.id = 0;
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ret = vmbus_sendpacket(net_device->dev->channel,
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revoke_packet,
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sizeof(struct nvsp_message),
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(unsigned long)revoke_packet,
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VM_PKT_DATA_INBAND, 0);
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/* If we failed here, we might as well return and
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* have a leak rather than continue and a bugchk
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*/
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if (ret != 0) {
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netdev_err(ndev, "unable to send "
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"revoke send buffer to netvsp\n");
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return ret;
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}
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}
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/* Teardown the gpadl on the vsp end */
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if (net_device->send_buf_gpadl_handle) {
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ret = vmbus_teardown_gpadl(net_device->dev->channel,
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net_device->send_buf_gpadl_handle);
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/* If we failed here, we might as well return and have a leak
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* rather than continue and a bugchk
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*/
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if (ret != 0) {
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netdev_err(ndev,
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"unable to teardown send buffer's gpadl\n");
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return ret;
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}
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net_device->recv_buf_gpadl_handle = 0;
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}
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if (net_device->send_buf) {
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/* Free up the receive buffer */
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free_pages((unsigned long)net_device->send_buf,
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get_order(net_device->send_buf_size));
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net_device->send_buf = NULL;
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}
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kfree(net_device->send_section_map);
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return ret;
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}
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static int netvsc_init_buf(struct hv_device *device)
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{
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int ret = 0;
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int t;
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struct netvsc_device *net_device;
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struct nvsp_message *init_packet;
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struct net_device *ndev;
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net_device = get_outbound_net_device(device);
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if (!net_device)
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return -ENODEV;
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ndev = net_device->ndev;
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net_device->recv_buf = vzalloc(net_device->recv_buf_size);
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if (!net_device->recv_buf) {
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netdev_err(ndev, "unable to allocate receive "
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"buffer of size %d\n", net_device->recv_buf_size);
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ret = -ENOMEM;
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goto cleanup;
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}
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/*
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* Establish the gpadl handle for this buffer on this
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* channel. Note: This call uses the vmbus connection rather
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* than the channel to establish the gpadl handle.
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*/
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ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
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net_device->recv_buf_size,
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&net_device->recv_buf_gpadl_handle);
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if (ret != 0) {
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netdev_err(ndev,
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"unable to establish receive buffer's gpadl\n");
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goto cleanup;
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}
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/* Notify the NetVsp of the gpadl handle */
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init_packet = &net_device->channel_init_pkt;
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memset(init_packet, 0, sizeof(struct nvsp_message));
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init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
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init_packet->msg.v1_msg.send_recv_buf.
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gpadl_handle = net_device->recv_buf_gpadl_handle;
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init_packet->msg.v1_msg.
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send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
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/* Send the gpadl notification request */
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ret = vmbus_sendpacket(device->channel, init_packet,
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sizeof(struct nvsp_message),
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(unsigned long)init_packet,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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if (ret != 0) {
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netdev_err(ndev,
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"unable to send receive buffer's gpadl to netvsp\n");
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goto cleanup;
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}
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t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
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BUG_ON(t == 0);
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/* Check the response */
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if (init_packet->msg.v1_msg.
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send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
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netdev_err(ndev, "Unable to complete receive buffer "
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"initialization with NetVsp - status %d\n",
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init_packet->msg.v1_msg.
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send_recv_buf_complete.status);
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ret = -EINVAL;
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goto cleanup;
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}
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/* Parse the response */
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net_device->recv_section_cnt = init_packet->msg.
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v1_msg.send_recv_buf_complete.num_sections;
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net_device->recv_section = kmemdup(
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init_packet->msg.v1_msg.send_recv_buf_complete.sections,
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net_device->recv_section_cnt *
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sizeof(struct nvsp_1_receive_buffer_section),
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GFP_KERNEL);
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if (net_device->recv_section == NULL) {
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ret = -EINVAL;
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goto cleanup;
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}
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/*
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* For 1st release, there should only be 1 section that represents the
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* entire receive buffer
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*/
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if (net_device->recv_section_cnt != 1 ||
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net_device->recv_section->offset != 0) {
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ret = -EINVAL;
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goto cleanup;
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}
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/* Now setup the send buffer.
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*/
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net_device->send_buf =
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(void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
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get_order(net_device->send_buf_size));
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if (!net_device->send_buf) {
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netdev_err(ndev, "unable to allocate send "
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"buffer of size %d\n", net_device->send_buf_size);
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ret = -ENOMEM;
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goto cleanup;
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}
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/* Establish the gpadl handle for this buffer on this
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* channel. Note: This call uses the vmbus connection rather
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* than the channel to establish the gpadl handle.
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*/
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ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
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net_device->send_buf_size,
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&net_device->send_buf_gpadl_handle);
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if (ret != 0) {
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netdev_err(ndev,
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"unable to establish send buffer's gpadl\n");
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goto cleanup;
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}
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/* Notify the NetVsp of the gpadl handle */
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init_packet = &net_device->channel_init_pkt;
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memset(init_packet, 0, sizeof(struct nvsp_message));
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init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
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init_packet->msg.v1_msg.send_recv_buf.gpadl_handle =
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net_device->send_buf_gpadl_handle;
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init_packet->msg.v1_msg.send_recv_buf.id = 0;
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/* Send the gpadl notification request */
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ret = vmbus_sendpacket(device->channel, init_packet,
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sizeof(struct nvsp_message),
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(unsigned long)init_packet,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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if (ret != 0) {
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netdev_err(ndev,
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"unable to send send buffer's gpadl to netvsp\n");
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goto cleanup;
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}
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t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
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BUG_ON(t == 0);
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/* Check the response */
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if (init_packet->msg.v1_msg.
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send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
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netdev_err(ndev, "Unable to complete send buffer "
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"initialization with NetVsp - status %d\n",
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init_packet->msg.v1_msg.
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send_recv_buf_complete.status);
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ret = -EINVAL;
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goto cleanup;
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}
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/* Parse the response */
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net_device->send_section_size = init_packet->msg.
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v1_msg.send_send_buf_complete.section_size;
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/* Section count is simply the size divided by the section size.
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*/
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net_device->send_section_cnt =
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net_device->send_buf_size/net_device->send_section_size;
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dev_info(&device->device, "Send section size: %d, Section count:%d\n",
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net_device->send_section_size, net_device->send_section_cnt);
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/* Setup state for managing the send buffer. */
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net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt,
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BITS_PER_LONG);
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net_device->send_section_map =
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kzalloc(net_device->map_words * sizeof(ulong), GFP_KERNEL);
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if (net_device->send_section_map == NULL)
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goto cleanup;
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goto exit;
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cleanup:
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netvsc_destroy_buf(net_device);
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exit:
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return ret;
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}
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/* Negotiate NVSP protocol version */
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static int negotiate_nvsp_ver(struct hv_device *device,
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struct netvsc_device *net_device,
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struct nvsp_message *init_packet,
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u32 nvsp_ver)
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{
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int ret, t;
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memset(init_packet, 0, sizeof(struct nvsp_message));
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init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
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init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
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init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
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/* Send the init request */
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ret = vmbus_sendpacket(device->channel, init_packet,
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sizeof(struct nvsp_message),
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(unsigned long)init_packet,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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if (ret != 0)
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return ret;
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t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
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if (t == 0)
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return -ETIMEDOUT;
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if (init_packet->msg.init_msg.init_complete.status !=
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NVSP_STAT_SUCCESS)
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return -EINVAL;
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if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
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return 0;
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/* NVSPv2 only: Send NDIS config */
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memset(init_packet, 0, sizeof(struct nvsp_message));
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init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
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init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu;
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init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
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ret = vmbus_sendpacket(device->channel, init_packet,
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sizeof(struct nvsp_message),
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(unsigned long)init_packet,
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VM_PKT_DATA_INBAND, 0);
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return ret;
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}
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static int netvsc_connect_vsp(struct hv_device *device)
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{
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int ret;
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struct netvsc_device *net_device;
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struct nvsp_message *init_packet;
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int ndis_version;
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struct net_device *ndev;
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u32 ver_list[] = { NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
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NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 };
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int i, num_ver = 4; /* number of different NVSP versions */
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net_device = get_outbound_net_device(device);
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if (!net_device)
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return -ENODEV;
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ndev = net_device->ndev;
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init_packet = &net_device->channel_init_pkt;
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/* Negotiate the latest NVSP protocol supported */
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for (i = num_ver - 1; i >= 0; i--)
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if (negotiate_nvsp_ver(device, net_device, init_packet,
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ver_list[i]) == 0) {
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net_device->nvsp_version = ver_list[i];
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break;
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}
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if (i < 0) {
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ret = -EPROTO;
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goto cleanup;
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}
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pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
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/* Send the ndis version */
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memset(init_packet, 0, sizeof(struct nvsp_message));
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if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
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ndis_version = 0x00060001;
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else
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ndis_version = 0x0006001e;
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init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
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|
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 */
|
|
if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
|
|
net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
|
|
else
|
|
net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
|
|
net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE;
|
|
|
|
ret = netvsc_init_buf(device);
|
|
|
|
cleanup:
|
|
return ret;
|
|
}
|
|
|
|
static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
|
|
{
|
|
netvsc_destroy_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;
|
|
unsigned long flags;
|
|
|
|
net_device = hv_get_drvdata(device);
|
|
|
|
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 */
|
|
if (net_device->sub_cb_buf)
|
|
vfree(net_device->sub_cb_buf);
|
|
|
|
kfree(net_device);
|
|
return 0;
|
|
}
|
|
|
|
|
|
#define RING_AVAIL_PERCENT_HIWATER 20
|
|
#define RING_AVAIL_PERCENT_LOWATER 10
|
|
|
|
/*
|
|
* Get the percentage of available bytes to write in the ring.
|
|
* The return value is in range from 0 to 100.
|
|
*/
|
|
static inline u32 hv_ringbuf_avail_percent(
|
|
struct hv_ring_buffer_info *ring_info)
|
|
{
|
|
u32 avail_read, avail_write;
|
|
|
|
hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write);
|
|
|
|
return avail_write * 100 / ring_info->ring_datasize;
|
|
}
|
|
|
|
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_completion(struct netvsc_device *net_device,
|
|
struct hv_device *device,
|
|
struct vmpacket_descriptor *packet)
|
|
{
|
|
struct nvsp_message *nvsp_packet;
|
|
struct hv_netvsc_packet *nvsc_packet;
|
|
struct net_device *ndev;
|
|
u32 send_index;
|
|
|
|
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) ||
|
|
(nvsp_packet->hdr.msg_type ==
|
|
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);
|
|
} else if (nvsp_packet->hdr.msg_type ==
|
|
NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
|
|
int num_outstanding_sends;
|
|
u16 q_idx = 0;
|
|
struct vmbus_channel *channel = device->channel;
|
|
int queue_sends;
|
|
|
|
/* Get the send context */
|
|
nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
|
|
packet->trans_id;
|
|
|
|
/* Notify the layer above us */
|
|
if (nvsc_packet) {
|
|
send_index = nvsc_packet->send_buf_index;
|
|
if (send_index != NETVSC_INVALID_INDEX)
|
|
netvsc_free_send_slot(net_device, send_index);
|
|
q_idx = nvsc_packet->q_idx;
|
|
channel = nvsc_packet->channel;
|
|
nvsc_packet->send_completion(nvsc_packet->
|
|
send_completion_ctx);
|
|
}
|
|
|
|
num_outstanding_sends =
|
|
atomic_dec_return(&net_device->num_outstanding_sends);
|
|
queue_sends = atomic_dec_return(&net_device->
|
|
queue_sends[q_idx]);
|
|
|
|
if (net_device->destroy && num_outstanding_sends == 0)
|
|
wake_up(&net_device->wait_drain);
|
|
|
|
if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) &&
|
|
!net_device->start_remove &&
|
|
(hv_ringbuf_avail_percent(&channel->outbound) >
|
|
RING_AVAIL_PERCENT_HIWATER || queue_sends < 1))
|
|
netif_tx_wake_queue(netdev_get_tx_queue(
|
|
ndev, q_idx));
|
|
} else {
|
|
netdev_err(ndev, "Unknown send completion packet type- "
|
|
"%d received!!\n", nvsp_packet->hdr.msg_type);
|
|
}
|
|
|
|
}
|
|
|
|
static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
|
|
{
|
|
unsigned long index;
|
|
u32 max_words = net_device->map_words;
|
|
unsigned long *map_addr = (unsigned long *)net_device->send_section_map;
|
|
u32 section_cnt = net_device->send_section_cnt;
|
|
int ret_val = NETVSC_INVALID_INDEX;
|
|
int i;
|
|
int prev_val;
|
|
|
|
for (i = 0; i < max_words; i++) {
|
|
if (!~(map_addr[i]))
|
|
continue;
|
|
index = ffz(map_addr[i]);
|
|
prev_val = sync_test_and_set_bit(index, &map_addr[i]);
|
|
if (prev_val)
|
|
continue;
|
|
if ((index + (i * BITS_PER_LONG)) >= section_cnt)
|
|
break;
|
|
ret_val = (index + (i * BITS_PER_LONG));
|
|
break;
|
|
}
|
|
return ret_val;
|
|
}
|
|
|
|
u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device,
|
|
unsigned int section_index,
|
|
struct hv_netvsc_packet *packet)
|
|
{
|
|
char *start = net_device->send_buf;
|
|
char *dest = (start + (section_index * net_device->send_section_size));
|
|
int i;
|
|
u32 msg_size = 0;
|
|
|
|
for (i = 0; i < packet->page_buf_cnt; i++) {
|
|
char *src = phys_to_virt(packet->page_buf[i].pfn << PAGE_SHIFT);
|
|
u32 offset = packet->page_buf[i].offset;
|
|
u32 len = packet->page_buf[i].len;
|
|
|
|
memcpy(dest, (src + offset), len);
|
|
msg_size += len;
|
|
dest += len;
|
|
}
|
|
return msg_size;
|
|
}
|
|
|
|
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;
|
|
struct vmbus_channel *out_channel = NULL;
|
|
u64 req_id;
|
|
unsigned int section_index = NETVSC_INVALID_INDEX;
|
|
u32 msg_size = 0;
|
|
struct sk_buff *skb;
|
|
|
|
|
|
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;
|
|
}
|
|
|
|
/* Attempt to send via sendbuf */
|
|
if (packet->total_data_buflen < net_device->send_section_size) {
|
|
section_index = netvsc_get_next_send_section(net_device);
|
|
if (section_index != NETVSC_INVALID_INDEX) {
|
|
msg_size = netvsc_copy_to_send_buf(net_device,
|
|
section_index,
|
|
packet);
|
|
skb = (struct sk_buff *)
|
|
(unsigned long)packet->send_completion_tid;
|
|
if (skb)
|
|
dev_kfree_skb_any(skb);
|
|
packet->page_buf_cnt = 0;
|
|
}
|
|
}
|
|
packet->send_buf_index = section_index;
|
|
|
|
|
|
sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
|
|
section_index;
|
|
sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = msg_size;
|
|
|
|
if (packet->send_completion)
|
|
req_id = (ulong)packet;
|
|
else
|
|
req_id = 0;
|
|
|
|
out_channel = net_device->chn_table[packet->q_idx];
|
|
if (out_channel == NULL)
|
|
out_channel = device->channel;
|
|
packet->channel = out_channel;
|
|
|
|
if (packet->page_buf_cnt) {
|
|
ret = vmbus_sendpacket_pagebuffer(out_channel,
|
|
packet->page_buf,
|
|
packet->page_buf_cnt,
|
|
&sendMessage,
|
|
sizeof(struct nvsp_message),
|
|
req_id);
|
|
} else {
|
|
ret = vmbus_sendpacket(out_channel, &sendMessage,
|
|
sizeof(struct nvsp_message),
|
|
req_id,
|
|
VM_PKT_DATA_INBAND,
|
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
|
|
}
|
|
|
|
if (ret == 0) {
|
|
atomic_inc(&net_device->num_outstanding_sends);
|
|
atomic_inc(&net_device->queue_sends[packet->q_idx]);
|
|
|
|
if (hv_ringbuf_avail_percent(&out_channel->outbound) <
|
|
RING_AVAIL_PERCENT_LOWATER) {
|
|
netif_tx_stop_queue(netdev_get_tx_queue(
|
|
ndev, packet->q_idx));
|
|
|
|
if (atomic_read(&net_device->
|
|
queue_sends[packet->q_idx]) < 1)
|
|
netif_tx_wake_queue(netdev_get_tx_queue(
|
|
ndev, packet->q_idx));
|
|
}
|
|
} else if (ret == -EAGAIN) {
|
|
netif_tx_stop_queue(netdev_get_tx_queue(
|
|
ndev, packet->q_idx));
|
|
if (atomic_read(&net_device->queue_sends[packet->q_idx]) < 1) {
|
|
netif_tx_wake_queue(netdev_get_tx_queue(
|
|
ndev, packet->q_idx));
|
|
ret = -ENOSPC;
|
|
}
|
|
} 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,
|
|
struct vmbus_channel *channel,
|
|
struct netvsc_device *net_device,
|
|
u64 transaction_id, u32 status)
|
|
{
|
|
struct nvsp_message recvcompMessage;
|
|
int retries = 0;
|
|
int ret;
|
|
struct net_device *ndev;
|
|
|
|
ndev = net_device->ndev;
|
|
|
|
recvcompMessage.hdr.msg_type =
|
|
NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
|
|
|
|
recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status;
|
|
|
|
retry_send_cmplt:
|
|
/* Send the completion */
|
|
ret = vmbus_sendpacket(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);
|
|
}
|
|
}
|
|
|
|
static void netvsc_receive(struct netvsc_device *net_device,
|
|
struct vmbus_channel *channel,
|
|
struct hv_device *device,
|
|
struct vmpacket_descriptor *packet)
|
|
{
|
|
struct vmtransfer_page_packet_header *vmxferpage_packet;
|
|
struct nvsp_message *nvsp_packet;
|
|
struct hv_netvsc_packet nv_pkt;
|
|
struct hv_netvsc_packet *netvsc_packet = &nv_pkt;
|
|
u32 status = NVSP_STAT_SUCCESS;
|
|
int i;
|
|
int count = 0;
|
|
struct net_device *ndev;
|
|
|
|
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;
|
|
}
|
|
|
|
count = vmxferpage_packet->range_cnt;
|
|
netvsc_packet->device = device;
|
|
netvsc_packet->channel = channel;
|
|
|
|
/* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
|
|
for (i = 0; i < count; i++) {
|
|
/* Initialize the netvsc packet */
|
|
netvsc_packet->status = NVSP_STAT_SUCCESS;
|
|
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);
|
|
|
|
if (netvsc_packet->status != NVSP_STAT_SUCCESS)
|
|
status = NVSP_STAT_FAIL;
|
|
}
|
|
|
|
netvsc_send_recv_completion(device, channel, net_device,
|
|
vmxferpage_packet->d.trans_id, status);
|
|
}
|
|
|
|
|
|
static void netvsc_send_table(struct hv_device *hdev,
|
|
struct vmpacket_descriptor *vmpkt)
|
|
{
|
|
struct netvsc_device *nvscdev;
|
|
struct net_device *ndev;
|
|
struct nvsp_message *nvmsg;
|
|
int i;
|
|
u32 count, *tab;
|
|
|
|
nvscdev = get_outbound_net_device(hdev);
|
|
if (!nvscdev)
|
|
return;
|
|
ndev = nvscdev->ndev;
|
|
|
|
nvmsg = (struct nvsp_message *)((unsigned long)vmpkt +
|
|
(vmpkt->offset8 << 3));
|
|
|
|
if (nvmsg->hdr.msg_type != NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE)
|
|
return;
|
|
|
|
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++)
|
|
nvscdev->send_table[i] = tab[i];
|
|
}
|
|
|
|
void netvsc_channel_cb(void *context)
|
|
{
|
|
int ret;
|
|
struct vmbus_channel *channel = (struct vmbus_channel *)context;
|
|
struct hv_device *device;
|
|
struct netvsc_device *net_device;
|
|
u32 bytes_recvd;
|
|
u64 request_id;
|
|
struct vmpacket_descriptor *desc;
|
|
unsigned char *buffer;
|
|
int bufferlen = NETVSC_PACKET_SIZE;
|
|
struct net_device *ndev;
|
|
|
|
if (channel->primary_channel != NULL)
|
|
device = channel->primary_channel->device_obj;
|
|
else
|
|
device = channel->device_obj;
|
|
|
|
net_device = get_inbound_net_device(device);
|
|
if (!net_device)
|
|
return;
|
|
ndev = net_device->ndev;
|
|
buffer = get_per_channel_state(channel);
|
|
|
|
do {
|
|
ret = vmbus_recvpacket_raw(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(net_device,
|
|
device, desc);
|
|
break;
|
|
|
|
case VM_PKT_DATA_USING_XFER_PAGES:
|
|
netvsc_receive(net_device, channel,
|
|
device, desc);
|
|
break;
|
|
|
|
case VM_PKT_DATA_INBAND:
|
|
netvsc_send_table(device, desc);
|
|
break;
|
|
|
|
default:
|
|
netdev_err(ndev,
|
|
"unhandled packet type %d, "
|
|
"tid %llx len %d\n",
|
|
desc->type, request_id,
|
|
bytes_recvd);
|
|
break;
|
|
}
|
|
|
|
} else {
|
|
/*
|
|
* We are done for this pass.
|
|
*/
|
|
break;
|
|
}
|
|
|
|
} else if (ret == -ENOBUFS) {
|
|
if (bufferlen > NETVSC_PACKET_SIZE)
|
|
kfree(buffer);
|
|
/* 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);
|
|
|
|
if (bufferlen > NETVSC_PACKET_SIZE)
|
|
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 ring_size =
|
|
((struct netvsc_device_info *)additional_info)->ring_size;
|
|
struct netvsc_device *net_device;
|
|
struct net_device *ndev;
|
|
|
|
net_device = alloc_net_device(device);
|
|
if (!net_device) {
|
|
ret = -ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
|
|
net_device->ring_size = ring_size;
|
|
|
|
/*
|
|
* 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 */
|
|
init_completion(&net_device->channel_init_wait);
|
|
|
|
set_per_channel_state(device->channel, net_device->cb_buffer);
|
|
|
|
/* Open the channel */
|
|
ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
|
|
ring_size * PAGE_SIZE, NULL, 0,
|
|
netvsc_channel_cb, device->channel);
|
|
|
|
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");
|
|
|
|
net_device->chn_table[0] = device->channel;
|
|
|
|
/* 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)
|
|
kfree(net_device);
|
|
|
|
return ret;
|
|
}
|