![Mohammed Gamal](/assets/img/avatar_default.png)
The callers to netvsc_revoke_*_buf() and netvsc_teardown_*_gpadl() already have their net_device instances. Pass them as a paramaeter to the function instead of obtaining them from netvsc_device struct everytime Signed-off-by: Mohammed Gamal <mgamal@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1396 lines
39 KiB
C
1396 lines
39 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 <linux/vmalloc.h>
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#include <linux/rtnetlink.h>
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#include <linux/prefetch.h>
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#include <linux/reciprocal_div.h>
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#include <asm/sync_bitops.h>
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#include "hyperv_net.h"
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#include "netvsc_trace.h"
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/*
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* Switch the data path from the synthetic interface to the VF
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* interface.
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*/
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void netvsc_switch_datapath(struct net_device *ndev, bool vf)
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{
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struct net_device_context *net_device_ctx = netdev_priv(ndev);
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struct hv_device *dev = net_device_ctx->device_ctx;
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struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev);
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struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt;
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memset(init_pkt, 0, sizeof(struct nvsp_message));
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init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH;
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if (vf)
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init_pkt->msg.v4_msg.active_dp.active_datapath =
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NVSP_DATAPATH_VF;
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else
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init_pkt->msg.v4_msg.active_dp.active_datapath =
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NVSP_DATAPATH_SYNTHETIC;
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trace_nvsp_send(ndev, init_pkt);
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vmbus_sendpacket(dev->channel, init_pkt,
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sizeof(struct nvsp_message),
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(unsigned long)init_pkt,
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VM_PKT_DATA_INBAND, 0);
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}
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static struct netvsc_device *alloc_net_device(void)
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{
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struct netvsc_device *net_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->destroy = false;
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net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
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net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
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init_completion(&net_device->channel_init_wait);
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init_waitqueue_head(&net_device->subchan_open);
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INIT_WORK(&net_device->subchan_work, rndis_set_subchannel);
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return net_device;
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}
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static void free_netvsc_device(struct rcu_head *head)
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{
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struct netvsc_device *nvdev
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= container_of(head, struct netvsc_device, rcu);
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int i;
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kfree(nvdev->extension);
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vfree(nvdev->recv_buf);
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vfree(nvdev->send_buf);
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kfree(nvdev->send_section_map);
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for (i = 0; i < VRSS_CHANNEL_MAX; i++)
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vfree(nvdev->chan_table[i].mrc.slots);
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kfree(nvdev);
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}
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static void free_netvsc_device_rcu(struct netvsc_device *nvdev)
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{
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call_rcu(&nvdev->rcu, free_netvsc_device);
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}
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static void netvsc_revoke_recv_buf(struct hv_device *device,
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struct netvsc_device *net_device,
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struct net_device *ndev)
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{
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struct nvsp_message *revoke_packet;
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int ret;
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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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trace_nvsp_send(ndev, revoke_packet);
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ret = vmbus_sendpacket(device->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 the failure is because the channel is rescinded;
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* ignore the failure since we cannot send on a rescinded
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* channel. This would allow us to properly cleanup
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* even when the channel is rescinded.
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*/
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if (device->channel->rescind)
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ret = 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;
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}
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net_device->recv_section_cnt = 0;
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}
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}
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static void netvsc_revoke_send_buf(struct hv_device *device,
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struct netvsc_device *net_device,
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struct net_device *ndev)
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{
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struct nvsp_message *revoke_packet;
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int ret;
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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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* NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
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* NVSP_MSG1_TYPE_SEND_SEND_BUF 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_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_SEND_BUF;
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revoke_packet->msg.v1_msg.revoke_send_buf.id =
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NETVSC_SEND_BUFFER_ID;
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trace_nvsp_send(ndev, revoke_packet);
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ret = vmbus_sendpacket(device->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 the failure is because the channel is rescinded;
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* ignore the failure since we cannot send on a rescinded
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* channel. This would allow us to properly cleanup
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* even when the channel is rescinded.
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*/
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if (device->channel->rescind)
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ret = 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;
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}
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net_device->send_section_cnt = 0;
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}
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}
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static void netvsc_teardown_recv_gpadl(struct hv_device *device,
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struct netvsc_device *net_device,
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struct net_device *ndev)
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{
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int ret;
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if (net_device->recv_buf_gpadl_handle) {
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ret = vmbus_teardown_gpadl(device->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;
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}
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net_device->recv_buf_gpadl_handle = 0;
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}
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}
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static void netvsc_teardown_send_gpadl(struct hv_device *device,
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struct netvsc_device *net_device,
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struct net_device *ndev)
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{
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int ret;
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if (net_device->send_buf_gpadl_handle) {
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ret = vmbus_teardown_gpadl(device->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;
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}
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net_device->send_buf_gpadl_handle = 0;
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}
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}
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int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx)
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{
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struct netvsc_channel *nvchan = &net_device->chan_table[q_idx];
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int node = cpu_to_node(nvchan->channel->target_cpu);
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size_t size;
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size = net_device->recv_completion_cnt * sizeof(struct recv_comp_data);
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nvchan->mrc.slots = vzalloc_node(size, node);
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if (!nvchan->mrc.slots)
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nvchan->mrc.slots = vzalloc(size);
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return nvchan->mrc.slots ? 0 : -ENOMEM;
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}
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static int netvsc_init_buf(struct hv_device *device,
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struct netvsc_device *net_device,
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const struct netvsc_device_info *device_info)
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{
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struct nvsp_1_message_send_receive_buffer_complete *resp;
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struct net_device *ndev = hv_get_drvdata(device);
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struct nvsp_message *init_packet;
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unsigned int buf_size;
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size_t map_words;
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int ret = 0;
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/* Get receive buffer area. */
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buf_size = device_info->recv_sections * device_info->recv_section_size;
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buf_size = roundup(buf_size, PAGE_SIZE);
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/* Legacy hosts only allow smaller receive buffer */
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if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
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buf_size = min_t(unsigned int, buf_size,
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NETVSC_RECEIVE_BUFFER_SIZE_LEGACY);
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net_device->recv_buf = vzalloc(buf_size);
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if (!net_device->recv_buf) {
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netdev_err(ndev,
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"unable to allocate receive buffer of size %u\n",
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buf_size);
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ret = -ENOMEM;
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goto cleanup;
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}
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net_device->recv_buf_size = buf_size;
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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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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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trace_nvsp_send(ndev, init_packet);
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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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wait_for_completion(&net_device->channel_init_wait);
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/* Check the response */
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resp = &init_packet->msg.v1_msg.send_recv_buf_complete;
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if (resp->status != NVSP_STAT_SUCCESS) {
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netdev_err(ndev,
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"Unable to complete receive buffer initialization with NetVsp - status %d\n",
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resp->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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netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n",
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resp->num_sections, resp->sections[0].sub_alloc_size,
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resp->sections[0].num_sub_allocs);
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/* There should only be one section for the entire receive buffer */
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if (resp->num_sections != 1 || resp->sections[0].offset != 0) {
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ret = -EINVAL;
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goto cleanup;
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}
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net_device->recv_section_size = resp->sections[0].sub_alloc_size;
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net_device->recv_section_cnt = resp->sections[0].num_sub_allocs;
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/* Setup receive completion ring */
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net_device->recv_completion_cnt
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= round_up(net_device->recv_section_cnt + 1,
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PAGE_SIZE / sizeof(u64));
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ret = netvsc_alloc_recv_comp_ring(net_device, 0);
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if (ret)
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goto cleanup;
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/* Now setup the send buffer. */
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buf_size = device_info->send_sections * device_info->send_section_size;
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buf_size = round_up(buf_size, PAGE_SIZE);
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net_device->send_buf = vzalloc(buf_size);
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if (!net_device->send_buf) {
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netdev_err(ndev, "unable to allocate send buffer of size %u\n",
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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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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_send_buf.gpadl_handle =
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net_device->send_buf_gpadl_handle;
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init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
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trace_nvsp_send(ndev, init_packet);
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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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wait_for_completion(&net_device->channel_init_wait);
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|
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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_send_buf_complete.status);
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ret = -EINVAL;
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goto cleanup;
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}
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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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|
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/* Section count is simply the size divided by the section size. */
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net_device->send_section_cnt = buf_size / net_device->send_section_size;
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|
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netdev_dbg(ndev, "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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|
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/* Setup state for managing the send buffer. */
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map_words = DIV_ROUND_UP(net_device->send_section_cnt, BITS_PER_LONG);
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|
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net_device->send_section_map = kcalloc(map_words, sizeof(ulong), GFP_KERNEL);
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if (net_device->send_section_map == NULL) {
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ret = -ENOMEM;
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goto cleanup;
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}
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goto exit;
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cleanup:
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netvsc_revoke_recv_buf(device, net_device, ndev);
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netvsc_revoke_send_buf(device, net_device, ndev);
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netvsc_teardown_recv_gpadl(device, net_device, ndev);
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netvsc_teardown_send_gpadl(device, net_device, ndev);
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exit:
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return ret;
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}
|
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|
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/* Negotiate NVSP protocol version */
|
|
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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struct net_device *ndev = hv_get_drvdata(device);
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int ret;
|
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|
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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;
|
|
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
|
|
};
|
|
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
|
|
|
|
/*
|
|
* Get the percentage of available bytes to write in the ring.
|
|
* The return value is in range from 0 to 100.
|
|
*/
|
|
static u32 hv_ringbuf_avail_percent(const struct hv_ring_buffer_info *ring_info)
|
|
{
|
|
u32 avail_write = hv_get_bytes_to_write(ring_info);
|
|
|
|
return reciprocal_divide(avail_write * 100, netvsc_ring_reciprocal);
|
|
}
|
|
|
|
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 netvsc_device *net_device,
|
|
struct vmbus_channel *incoming_channel,
|
|
struct hv_device *device,
|
|
const struct vmpacket_descriptor *desc,
|
|
int budget)
|
|
{
|
|
struct sk_buff *skb = (struct sk_buff *)(unsigned long)desc->trans_id;
|
|
struct net_device *ndev = hv_get_drvdata(device);
|
|
struct net_device_context *ndev_ctx = netdev_priv(ndev);
|
|
struct vmbus_channel *channel = device->channel;
|
|
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;
|
|
channel = incoming_channel;
|
|
|
|
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_ringbuf_avail_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 netvsc_device *net_device,
|
|
struct vmbus_channel *incoming_channel,
|
|
struct hv_device *device,
|
|
const struct vmpacket_descriptor *desc,
|
|
int budget)
|
|
{
|
|
struct nvsp_message *nvsp_packet = hv_pkt_data(desc);
|
|
struct net_device *ndev = hv_get_drvdata(device);
|
|
|
|
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(net_device, incoming_channel,
|
|
device, 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_ringbuf_avail_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 net_device_context *net_device_ctx,
|
|
struct hv_device *device,
|
|
struct vmbus_channel *channel,
|
|
const struct vmpacket_descriptor *desc,
|
|
struct nvsp_message *nvsp)
|
|
{
|
|
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 hv_device *hdev,
|
|
struct nvsp_message *nvmsg)
|
|
{
|
|
struct net_device *ndev = hv_get_drvdata(hdev);
|
|
struct net_device_context *net_device_ctx = netdev_priv(ndev);
|
|
int i;
|
|
u32 count, *tab;
|
|
|
|
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_context *net_device_ctx,
|
|
struct nvsp_message *nvmsg)
|
|
{
|
|
net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
|
|
net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
|
|
}
|
|
|
|
static inline void netvsc_receive_inband(struct hv_device *hdev,
|
|
struct net_device_context *net_device_ctx,
|
|
struct nvsp_message *nvmsg)
|
|
{
|
|
switch (nvmsg->hdr.msg_type) {
|
|
case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
|
|
netvsc_send_table(hdev, nvmsg);
|
|
break;
|
|
|
|
case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
|
|
netvsc_send_vf(net_device_ctx, 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)
|
|
{
|
|
struct net_device_context *net_device_ctx = netdev_priv(ndev);
|
|
struct nvsp_message *nvmsg = hv_pkt_data(desc);
|
|
|
|
trace_nvsp_recv(ndev, channel, nvmsg);
|
|
|
|
switch (desc->type) {
|
|
case VM_PKT_COMP:
|
|
netvsc_send_completion(net_device, channel, device,
|
|
desc, budget);
|
|
break;
|
|
|
|
case VM_PKT_DATA_USING_XFER_PAGES:
|
|
return netvsc_receive(ndev, net_device, net_device_ctx,
|
|
device, channel, desc, nvmsg);
|
|
break;
|
|
|
|
case VM_PKT_DATA_INBAND:
|
|
netvsc_receive_inband(device, net_device_ctx, 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;
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/* If send of pending receive completions suceeded
|
|
* and did not exhaust NAPI budget this time
|
|
* and not doing busy poll
|
|
* then re-enable host interrupts
|
|
* and reschedule if ring is not empty.
|
|
*/
|
|
if (send_recv_completions(ndev, net_device, nvchan) == 0 &&
|
|
work_done < budget &&
|
|
napi_complete_done(napi, work_done) &&
|
|
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);
|
|
}
|