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1649 lines
46 KiB
1649 lines
46 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2009, Microsoft Corporation. |
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* |
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* Authors: |
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* Haiyang Zhang <[email protected]> |
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* Hank Janssen <[email protected]> |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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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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|
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#include <asm/sync_bitops.h> |
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#include <asm/mshyperv.h> |
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|
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#include "hyperv_net.h" |
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#include "netvsc_trace.h" |
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|
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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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|
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/* Block sending traffic to VF if it's about to be gone */ |
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if (!vf) |
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net_device_ctx->data_path_is_vf = vf; |
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|
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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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|
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trace_nvsp_send(ndev, init_pkt); |
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|
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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, |
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
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wait_for_completion(&nv_dev->channel_init_wait); |
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net_device_ctx->data_path_is_vf = vf; |
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} |
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|
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/* Worker to setup sub channels on initial setup |
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* Initial hotplug event occurs in softirq context |
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* and can't wait for channels. |
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*/ |
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static void netvsc_subchan_work(struct work_struct *w) |
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{ |
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struct netvsc_device *nvdev = |
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container_of(w, struct netvsc_device, subchan_work); |
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struct rndis_device *rdev; |
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int i, ret; |
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|
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/* Avoid deadlock with device removal already under RTNL */ |
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if (!rtnl_trylock()) { |
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schedule_work(w); |
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return; |
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} |
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|
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rdev = nvdev->extension; |
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if (rdev) { |
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ret = rndis_set_subchannel(rdev->ndev, nvdev, NULL); |
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if (ret == 0) { |
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netif_device_attach(rdev->ndev); |
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} else { |
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/* fallback to only primary channel */ |
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for (i = 1; i < nvdev->num_chn; i++) |
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netif_napi_del(&nvdev->chan_table[i].napi); |
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|
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nvdev->max_chn = 1; |
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nvdev->num_chn = 1; |
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} |
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} |
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|
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rtnl_unlock(); |
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} |
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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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|
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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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|
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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->tx_disable = true; |
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|
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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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|
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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, netvsc_subchan_work); |
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|
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return net_device; |
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} |
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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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|
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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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|
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for (i = 0; i < VRSS_CHANNEL_MAX; i++) { |
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xdp_rxq_info_unreg(&nvdev->chan_table[i].xdp_rxq); |
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kfree(nvdev->chan_table[i].recv_buf); |
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vfree(nvdev->chan_table[i].mrc.slots); |
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} |
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|
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kfree(nvdev); |
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} |
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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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|
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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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/* |
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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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|
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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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|
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trace_nvsp_send(ndev, revoke_packet); |
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|
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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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VMBUS_RQST_ID_NO_RESPONSE, |
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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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|
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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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|
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trace_nvsp_send(ndev, revoke_packet); |
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|
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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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VMBUS_RQST_ID_NO_RESPONSE, |
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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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|
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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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|
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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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|
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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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|
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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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|
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return nvchan->mrc.slots ? 0 : -ENOMEM; |
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} |
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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 i, 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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|
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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, |
|
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"); |
|
goto cleanup; |
|
} |
|
|
|
/* 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 */ |
|
ret = vmbus_sendpacket(device->channel, init_packet, |
|
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); |
|
if (ret != 0) { |
|
netdev_err(ndev, |
|
"unable to send receive buffer's gpadl to netvsp\n"); |
|
goto cleanup; |
|
} |
|
|
|
wait_for_completion(&net_device->channel_init_wait); |
|
|
|
/* Check the response */ |
|
resp = &init_packet->msg.v1_msg.send_recv_buf_complete; |
|
if (resp->status != NVSP_STAT_SUCCESS) { |
|
netdev_err(ndev, |
|
"Unable to complete receive buffer initialization with NetVsp - status %d\n", |
|
resp->status); |
|
ret = -EINVAL; |
|
goto cleanup; |
|
} |
|
|
|
/* Parse the response */ |
|
netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n", |
|
resp->num_sections, resp->sections[0].sub_alloc_size, |
|
resp->sections[0].num_sub_allocs); |
|
|
|
/* There should only be one section for the entire receive buffer */ |
|
if (resp->num_sections != 1 || resp->sections[0].offset != 0) { |
|
ret = -EINVAL; |
|
goto cleanup; |
|
} |
|
|
|
net_device->recv_section_size = resp->sections[0].sub_alloc_size; |
|
net_device->recv_section_cnt = resp->sections[0].num_sub_allocs; |
|
|
|
/* Ensure buffer will not overflow */ |
|
if (net_device->recv_section_size < NETVSC_MTU_MIN || (u64)net_device->recv_section_size * |
|
(u64)net_device->recv_section_cnt > (u64)buf_size) { |
|
netdev_err(ndev, "invalid recv_section_size %u\n", |
|
net_device->recv_section_size); |
|
ret = -EINVAL; |
|
goto cleanup; |
|
} |
|
|
|
for (i = 0; i < VRSS_CHANNEL_MAX; i++) { |
|
struct netvsc_channel *nvchan = &net_device->chan_table[i]; |
|
|
|
nvchan->recv_buf = kzalloc(net_device->recv_section_size, GFP_KERNEL); |
|
if (nvchan->recv_buf == NULL) { |
|
ret = -ENOMEM; |
|
goto cleanup; |
|
} |
|
} |
|
|
|
/* Setup receive completion ring. |
|
* Add 1 to the recv_section_cnt because at least one entry in a |
|
* ring buffer has to be empty. |
|
*/ |
|
net_device->recv_completion_cnt = net_device->recv_section_cnt + 1; |
|
ret = netvsc_alloc_recv_comp_ring(net_device, 0); |
|
if (ret) |
|
goto cleanup; |
|
|
|
/* Now setup the send buffer. */ |
|
buf_size = device_info->send_sections * device_info->send_section_size; |
|
buf_size = round_up(buf_size, PAGE_SIZE); |
|
|
|
net_device->send_buf = vzalloc(buf_size); |
|
if (!net_device->send_buf) { |
|
netdev_err(ndev, "unable to allocate send buffer of size %u\n", |
|
buf_size); |
|
ret = -ENOMEM; |
|
goto cleanup; |
|
} |
|
|
|
/* Establish the gpadl handle for this buffer on this |
|
* channel. Note: This call uses the vmbus connection rather |
|
* than the channel to establish the gpadl handle. |
|
*/ |
|
ret = vmbus_establish_gpadl(device->channel, net_device->send_buf, |
|
buf_size, |
|
&net_device->send_buf_gpadl_handle); |
|
if (ret != 0) { |
|
netdev_err(ndev, |
|
"unable to establish send buffer's gpadl\n"); |
|
goto cleanup; |
|
} |
|
|
|
/* Notify the NetVsp of the gpadl handle */ |
|
init_packet = &net_device->channel_init_pkt; |
|
memset(init_packet, 0, sizeof(struct nvsp_message)); |
|
init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF; |
|
init_packet->msg.v1_msg.send_send_buf.gpadl_handle = |
|
net_device->send_buf_gpadl_handle; |
|
init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID; |
|
|
|
trace_nvsp_send(ndev, init_packet); |
|
|
|
/* Send the gpadl notification request */ |
|
ret = vmbus_sendpacket(device->channel, init_packet, |
|
sizeof(struct nvsp_message), |
|
(unsigned long)init_packet, |
|
VM_PKT_DATA_INBAND, |
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
|
if (ret != 0) { |
|
netdev_err(ndev, |
|
"unable to send send buffer's gpadl to netvsp\n"); |
|
goto cleanup; |
|
} |
|
|
|
wait_for_completion(&net_device->channel_init_wait); |
|
|
|
/* Check the response */ |
|
if (init_packet->msg.v1_msg. |
|
send_send_buf_complete.status != NVSP_STAT_SUCCESS) { |
|
netdev_err(ndev, "Unable to complete send buffer " |
|
"initialization with NetVsp - status %d\n", |
|
init_packet->msg.v1_msg. |
|
send_send_buf_complete.status); |
|
ret = -EINVAL; |
|
goto cleanup; |
|
} |
|
|
|
/* Parse the response */ |
|
net_device->send_section_size = init_packet->msg. |
|
v1_msg.send_send_buf_complete.section_size; |
|
if (net_device->send_section_size < NETVSC_MTU_MIN) { |
|
netdev_err(ndev, "invalid send_section_size %u\n", |
|
net_device->send_section_size); |
|
ret = -EINVAL; |
|
goto cleanup; |
|
} |
|
|
|
/* Section count is simply the size divided by the section size. */ |
|
net_device->send_section_cnt = buf_size / net_device->send_section_size; |
|
|
|
netdev_dbg(ndev, "Send section size: %d, Section count:%d\n", |
|
net_device->send_section_size, net_device->send_section_cnt); |
|
|
|
/* Setup state for managing the send buffer. */ |
|
map_words = DIV_ROUND_UP(net_device->send_section_cnt, BITS_PER_LONG); |
|
|
|
net_device->send_section_map = kcalloc(map_words, sizeof(ulong), GFP_KERNEL); |
|
if (net_device->send_section_map == NULL) { |
|
ret = -ENOMEM; |
|
goto cleanup; |
|
} |
|
|
|
goto exit; |
|
|
|
cleanup: |
|
netvsc_revoke_recv_buf(device, net_device, ndev); |
|
netvsc_revoke_send_buf(device, net_device, ndev); |
|
netvsc_teardown_recv_gpadl(device, net_device, ndev); |
|
netvsc_teardown_send_gpadl(device, net_device, ndev); |
|
|
|
exit: |
|
return ret; |
|
} |
|
|
|
/* Negotiate NVSP protocol version */ |
|
static int negotiate_nvsp_ver(struct hv_device *device, |
|
struct netvsc_device *net_device, |
|
struct nvsp_message *init_packet, |
|
u32 nvsp_ver) |
|
{ |
|
struct net_device *ndev = hv_get_drvdata(device); |
|
int ret; |
|
|
|
memset(init_packet, 0, sizeof(struct nvsp_message)); |
|
init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; |
|
init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; |
|
init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; |
|
trace_nvsp_send(ndev, init_packet); |
|
|
|
/* Send the init request */ |
|
ret = vmbus_sendpacket(device->channel, init_packet, |
|
sizeof(struct nvsp_message), |
|
(unsigned long)init_packet, |
|
VM_PKT_DATA_INBAND, |
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
|
|
|
if (ret != 0) |
|
return ret; |
|
|
|
wait_for_completion(&net_device->channel_init_wait); |
|
|
|
if (init_packet->msg.init_msg.init_complete.status != |
|
NVSP_STAT_SUCCESS) |
|
return -EINVAL; |
|
|
|
if (nvsp_ver == NVSP_PROTOCOL_VERSION_1) |
|
return 0; |
|
|
|
/* NVSPv2 or later: Send NDIS config */ |
|
memset(init_packet, 0, sizeof(struct nvsp_message)); |
|
init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; |
|
init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN; |
|
init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; |
|
|
|
if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) { |
|
if (hv_is_isolation_supported()) |
|
netdev_info(ndev, "SR-IOV not advertised by guests on the host supporting isolation\n"); |
|
else |
|
init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; |
|
|
|
/* Teaming bit is needed to receive link speed updates */ |
|
init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1; |
|
} |
|
|
|
if (nvsp_ver >= NVSP_PROTOCOL_VERSION_61) |
|
init_packet->msg.v2_msg.send_ndis_config.capability.rsc = 1; |
|
|
|
trace_nvsp_send(ndev, init_packet); |
|
|
|
ret = vmbus_sendpacket(device->channel, init_packet, |
|
sizeof(struct nvsp_message), |
|
VMBUS_RQST_ID_NO_RESPONSE, |
|
VM_PKT_DATA_INBAND, 0); |
|
|
|
return ret; |
|
} |
|
|
|
static int netvsc_connect_vsp(struct hv_device *device, |
|
struct netvsc_device *net_device, |
|
const struct netvsc_device_info *device_info) |
|
{ |
|
struct net_device *ndev = hv_get_drvdata(device); |
|
static const u32 ver_list[] = { |
|
NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2, |
|
NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5, |
|
NVSP_PROTOCOL_VERSION_6, NVSP_PROTOCOL_VERSION_61 |
|
}; |
|
struct nvsp_message *init_packet; |
|
int ndis_version, i, ret; |
|
|
|
init_packet = &net_device->channel_init_pkt; |
|
|
|
/* Negotiate the latest NVSP protocol supported */ |
|
for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--) |
|
if (negotiate_nvsp_ver(device, net_device, init_packet, |
|
ver_list[i]) == 0) { |
|
net_device->nvsp_version = ver_list[i]; |
|
break; |
|
} |
|
|
|
if (i < 0) { |
|
ret = -EPROTO; |
|
goto cleanup; |
|
} |
|
|
|
if (hv_is_isolation_supported() && net_device->nvsp_version < NVSP_PROTOCOL_VERSION_61) { |
|
netdev_err(ndev, "Invalid NVSP version 0x%x (expected >= 0x%x) from the host supporting isolation\n", |
|
net_device->nvsp_version, NVSP_PROTOCOL_VERSION_61); |
|
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), |
|
VMBUS_RQST_ID_NO_RESPONSE, |
|
VM_PKT_DATA_INBAND, 0); |
|
if (ret != 0) |
|
goto cleanup; |
|
|
|
|
|
ret = netvsc_init_buf(device, net_device, device_info); |
|
|
|
cleanup: |
|
return ret; |
|
} |
|
|
|
/* |
|
* netvsc_device_remove - Callback when the root bus device is removed |
|
*/ |
|
void netvsc_device_remove(struct hv_device *device) |
|
{ |
|
struct net_device *ndev = hv_get_drvdata(device); |
|
struct net_device_context *net_device_ctx = netdev_priv(ndev); |
|
struct netvsc_device *net_device |
|
= rtnl_dereference(net_device_ctx->nvdev); |
|
int i; |
|
|
|
/* |
|
* Revoke receive buffer. If host is pre-Win2016 then tear down |
|
* receive buffer GPADL. Do the same for send buffer. |
|
*/ |
|
netvsc_revoke_recv_buf(device, net_device, ndev); |
|
if (vmbus_proto_version < VERSION_WIN10) |
|
netvsc_teardown_recv_gpadl(device, net_device, ndev); |
|
|
|
netvsc_revoke_send_buf(device, net_device, ndev); |
|
if (vmbus_proto_version < VERSION_WIN10) |
|
netvsc_teardown_send_gpadl(device, net_device, ndev); |
|
|
|
RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); |
|
|
|
/* Disable NAPI and disassociate its context from the device. */ |
|
for (i = 0; i < net_device->num_chn; i++) { |
|
/* See also vmbus_reset_channel_cb(). */ |
|
napi_disable(&net_device->chan_table[i].napi); |
|
netif_napi_del(&net_device->chan_table[i].napi); |
|
} |
|
|
|
/* |
|
* At this point, no one should be accessing net_device |
|
* except in here |
|
*/ |
|
netdev_dbg(ndev, "net device safe to remove\n"); |
|
|
|
/* Now, we can close the channel safely */ |
|
vmbus_close(device->channel); |
|
|
|
/* |
|
* If host is Win2016 or higher then we do the GPADL tear down |
|
* here after VMBus is closed. |
|
*/ |
|
if (vmbus_proto_version >= VERSION_WIN10) { |
|
netvsc_teardown_recv_gpadl(device, net_device, ndev); |
|
netvsc_teardown_send_gpadl(device, net_device, ndev); |
|
} |
|
|
|
/* Release all resources */ |
|
free_netvsc_device_rcu(net_device); |
|
} |
|
|
|
#define RING_AVAIL_PERCENT_HIWATER 20 |
|
#define RING_AVAIL_PERCENT_LOWATER 10 |
|
|
|
static inline void netvsc_free_send_slot(struct netvsc_device *net_device, |
|
u32 index) |
|
{ |
|
sync_change_bit(index, net_device->send_section_map); |
|
} |
|
|
|
static void netvsc_send_tx_complete(struct net_device *ndev, |
|
struct netvsc_device *net_device, |
|
struct vmbus_channel *channel, |
|
const struct vmpacket_descriptor *desc, |
|
int budget) |
|
{ |
|
struct net_device_context *ndev_ctx = netdev_priv(ndev); |
|
struct sk_buff *skb; |
|
u16 q_idx = 0; |
|
int queue_sends; |
|
u64 cmd_rqst; |
|
|
|
cmd_rqst = vmbus_request_addr(&channel->requestor, (u64)desc->trans_id); |
|
if (cmd_rqst == VMBUS_RQST_ERROR) { |
|
netdev_err(ndev, "Incorrect transaction id\n"); |
|
return; |
|
} |
|
|
|
skb = (struct sk_buff *)(unsigned long)cmd_rqst; |
|
|
|
/* Notify the layer above us */ |
|
if (likely(skb)) { |
|
const struct hv_netvsc_packet *packet |
|
= (struct hv_netvsc_packet *)skb->cb; |
|
u32 send_index = packet->send_buf_index; |
|
struct netvsc_stats *tx_stats; |
|
|
|
if (send_index != NETVSC_INVALID_INDEX) |
|
netvsc_free_send_slot(net_device, send_index); |
|
q_idx = packet->q_idx; |
|
|
|
tx_stats = &net_device->chan_table[q_idx].tx_stats; |
|
|
|
u64_stats_update_begin(&tx_stats->syncp); |
|
tx_stats->packets += packet->total_packets; |
|
tx_stats->bytes += packet->total_bytes; |
|
u64_stats_update_end(&tx_stats->syncp); |
|
|
|
napi_consume_skb(skb, budget); |
|
} |
|
|
|
queue_sends = |
|
atomic_dec_return(&net_device->chan_table[q_idx].queue_sends); |
|
|
|
if (unlikely(net_device->destroy)) { |
|
if (queue_sends == 0) |
|
wake_up(&net_device->wait_drain); |
|
} else { |
|
struct netdev_queue *txq = netdev_get_tx_queue(ndev, q_idx); |
|
|
|
if (netif_tx_queue_stopped(txq) && !net_device->tx_disable && |
|
(hv_get_avail_to_write_percent(&channel->outbound) > |
|
RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) { |
|
netif_tx_wake_queue(txq); |
|
ndev_ctx->eth_stats.wake_queue++; |
|
} |
|
} |
|
} |
|
|
|
static void netvsc_send_completion(struct net_device *ndev, |
|
struct netvsc_device *net_device, |
|
struct vmbus_channel *incoming_channel, |
|
const struct vmpacket_descriptor *desc, |
|
int budget) |
|
{ |
|
const struct nvsp_message *nvsp_packet; |
|
u32 msglen = hv_pkt_datalen(desc); |
|
struct nvsp_message *pkt_rqst; |
|
u64 cmd_rqst; |
|
|
|
/* First check if this is a VMBUS completion without data payload */ |
|
if (!msglen) { |
|
cmd_rqst = vmbus_request_addr(&incoming_channel->requestor, |
|
(u64)desc->trans_id); |
|
if (cmd_rqst == VMBUS_RQST_ERROR) { |
|
netdev_err(ndev, "Invalid transaction id\n"); |
|
return; |
|
} |
|
|
|
pkt_rqst = (struct nvsp_message *)(uintptr_t)cmd_rqst; |
|
switch (pkt_rqst->hdr.msg_type) { |
|
case NVSP_MSG4_TYPE_SWITCH_DATA_PATH: |
|
complete(&net_device->channel_init_wait); |
|
break; |
|
|
|
default: |
|
netdev_err(ndev, "Unexpected VMBUS completion!!\n"); |
|
} |
|
return; |
|
} |
|
|
|
/* Ensure packet is big enough to read header fields */ |
|
if (msglen < sizeof(struct nvsp_message_header)) { |
|
netdev_err(ndev, "nvsp_message length too small: %u\n", msglen); |
|
return; |
|
} |
|
|
|
nvsp_packet = hv_pkt_data(desc); |
|
switch (nvsp_packet->hdr.msg_type) { |
|
case NVSP_MSG_TYPE_INIT_COMPLETE: |
|
if (msglen < sizeof(struct nvsp_message_header) + |
|
sizeof(struct nvsp_message_init_complete)) { |
|
netdev_err(ndev, "nvsp_msg length too small: %u\n", |
|
msglen); |
|
return; |
|
} |
|
fallthrough; |
|
|
|
case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE: |
|
if (msglen < sizeof(struct nvsp_message_header) + |
|
sizeof(struct nvsp_1_message_send_receive_buffer_complete)) { |
|
netdev_err(ndev, "nvsp_msg1 length too small: %u\n", |
|
msglen); |
|
return; |
|
} |
|
fallthrough; |
|
|
|
case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE: |
|
if (msglen < sizeof(struct nvsp_message_header) + |
|
sizeof(struct nvsp_1_message_send_send_buffer_complete)) { |
|
netdev_err(ndev, "nvsp_msg1 length too small: %u\n", |
|
msglen); |
|
return; |
|
} |
|
fallthrough; |
|
|
|
case NVSP_MSG5_TYPE_SUBCHANNEL: |
|
if (msglen < sizeof(struct nvsp_message_header) + |
|
sizeof(struct nvsp_5_subchannel_complete)) { |
|
netdev_err(ndev, "nvsp_msg5 length too small: %u\n", |
|
msglen); |
|
return; |
|
} |
|
/* Copy the response back */ |
|
memcpy(&net_device->channel_init_pkt, nvsp_packet, |
|
sizeof(struct nvsp_message)); |
|
complete(&net_device->channel_init_wait); |
|
break; |
|
|
|
case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE: |
|
netvsc_send_tx_complete(ndev, net_device, incoming_channel, |
|
desc, budget); |
|
break; |
|
|
|
default: |
|
netdev_err(ndev, |
|
"Unknown send completion type %d received!!\n", |
|
nvsp_packet->hdr.msg_type); |
|
} |
|
} |
|
|
|
static u32 netvsc_get_next_send_section(struct netvsc_device *net_device) |
|
{ |
|
unsigned long *map_addr = net_device->send_section_map; |
|
unsigned int i; |
|
|
|
for_each_clear_bit(i, map_addr, net_device->send_section_cnt) { |
|
if (sync_test_and_set_bit(i, map_addr) == 0) |
|
return i; |
|
} |
|
|
|
return NETVSC_INVALID_INDEX; |
|
} |
|
|
|
static void netvsc_copy_to_send_buf(struct netvsc_device *net_device, |
|
unsigned int section_index, |
|
u32 pend_size, |
|
struct hv_netvsc_packet *packet, |
|
struct rndis_message *rndis_msg, |
|
struct hv_page_buffer *pb, |
|
bool xmit_more) |
|
{ |
|
char *start = net_device->send_buf; |
|
char *dest = start + (section_index * net_device->send_section_size) |
|
+ pend_size; |
|
int i; |
|
u32 padding = 0; |
|
u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt : |
|
packet->page_buf_cnt; |
|
u32 remain; |
|
|
|
/* Add padding */ |
|
remain = packet->total_data_buflen & (net_device->pkt_align - 1); |
|
if (xmit_more && remain) { |
|
padding = net_device->pkt_align - remain; |
|
rndis_msg->msg_len += padding; |
|
packet->total_data_buflen += padding; |
|
} |
|
|
|
for (i = 0; i < page_count; i++) { |
|
char *src = phys_to_virt(pb[i].pfn << HV_HYP_PAGE_SHIFT); |
|
u32 offset = pb[i].offset; |
|
u32 len = pb[i].len; |
|
|
|
memcpy(dest, (src + offset), len); |
|
dest += len; |
|
} |
|
|
|
if (padding) |
|
memset(dest, 0, padding); |
|
} |
|
|
|
static inline int netvsc_send_pkt( |
|
struct hv_device *device, |
|
struct hv_netvsc_packet *packet, |
|
struct netvsc_device *net_device, |
|
struct hv_page_buffer *pb, |
|
struct sk_buff *skb) |
|
{ |
|
struct nvsp_message nvmsg; |
|
struct nvsp_1_message_send_rndis_packet *rpkt = |
|
&nvmsg.msg.v1_msg.send_rndis_pkt; |
|
struct netvsc_channel * const nvchan = |
|
&net_device->chan_table[packet->q_idx]; |
|
struct vmbus_channel *out_channel = nvchan->channel; |
|
struct net_device *ndev = hv_get_drvdata(device); |
|
struct net_device_context *ndev_ctx = netdev_priv(ndev); |
|
struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx); |
|
u64 req_id; |
|
int ret; |
|
u32 ring_avail = hv_get_avail_to_write_percent(&out_channel->outbound); |
|
|
|
memset(&nvmsg, 0, sizeof(struct nvsp_message)); |
|
nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; |
|
if (skb) |
|
rpkt->channel_type = 0; /* 0 is RMC_DATA */ |
|
else |
|
rpkt->channel_type = 1; /* 1 is RMC_CONTROL */ |
|
|
|
rpkt->send_buf_section_index = packet->send_buf_index; |
|
if (packet->send_buf_index == NETVSC_INVALID_INDEX) |
|
rpkt->send_buf_section_size = 0; |
|
else |
|
rpkt->send_buf_section_size = packet->total_data_buflen; |
|
|
|
req_id = (ulong)skb; |
|
|
|
if (out_channel->rescind) |
|
return -ENODEV; |
|
|
|
trace_nvsp_send_pkt(ndev, out_channel, rpkt); |
|
|
|
if (packet->page_buf_cnt) { |
|
if (packet->cp_partial) |
|
pb += packet->rmsg_pgcnt; |
|
|
|
ret = vmbus_sendpacket_pagebuffer(out_channel, |
|
pb, packet->page_buf_cnt, |
|
&nvmsg, sizeof(nvmsg), |
|
req_id); |
|
} else { |
|
ret = vmbus_sendpacket(out_channel, |
|
&nvmsg, sizeof(nvmsg), |
|
req_id, VM_PKT_DATA_INBAND, |
|
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
|
} |
|
|
|
if (ret == 0) { |
|
atomic_inc_return(&nvchan->queue_sends); |
|
|
|
if (ring_avail < RING_AVAIL_PERCENT_LOWATER) { |
|
netif_tx_stop_queue(txq); |
|
ndev_ctx->eth_stats.stop_queue++; |
|
} |
|
} else if (ret == -EAGAIN) { |
|
netif_tx_stop_queue(txq); |
|
ndev_ctx->eth_stats.stop_queue++; |
|
} else { |
|
netdev_err(ndev, |
|
"Unable to send packet pages %u len %u, ret %d\n", |
|
packet->page_buf_cnt, packet->total_data_buflen, |
|
ret); |
|
} |
|
|
|
if (netif_tx_queue_stopped(txq) && |
|
atomic_read(&nvchan->queue_sends) < 1 && |
|
!net_device->tx_disable) { |
|
netif_tx_wake_queue(txq); |
|
ndev_ctx->eth_stats.wake_queue++; |
|
if (ret == -EAGAIN) |
|
ret = -ENOSPC; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/* Move packet out of multi send data (msd), and clear msd */ |
|
static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send, |
|
struct sk_buff **msd_skb, |
|
struct multi_send_data *msdp) |
|
{ |
|
*msd_skb = msdp->skb; |
|
*msd_send = msdp->pkt; |
|
msdp->skb = NULL; |
|
msdp->pkt = NULL; |
|
msdp->count = 0; |
|
} |
|
|
|
/* RCU already held by caller */ |
|
int netvsc_send(struct net_device *ndev, |
|
struct hv_netvsc_packet *packet, |
|
struct rndis_message *rndis_msg, |
|
struct hv_page_buffer *pb, |
|
struct sk_buff *skb, |
|
bool xdp_tx) |
|
{ |
|
struct net_device_context *ndev_ctx = netdev_priv(ndev); |
|
struct netvsc_device *net_device |
|
= rcu_dereference_bh(ndev_ctx->nvdev); |
|
struct hv_device *device = ndev_ctx->device_ctx; |
|
int ret = 0; |
|
struct netvsc_channel *nvchan; |
|
u32 pktlen = packet->total_data_buflen, msd_len = 0; |
|
unsigned int section_index = NETVSC_INVALID_INDEX; |
|
struct multi_send_data *msdp; |
|
struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL; |
|
struct sk_buff *msd_skb = NULL; |
|
bool try_batch, xmit_more; |
|
|
|
/* If device is rescinded, return error and packet will get dropped. */ |
|
if (unlikely(!net_device || net_device->destroy)) |
|
return -ENODEV; |
|
|
|
nvchan = &net_device->chan_table[packet->q_idx]; |
|
packet->send_buf_index = NETVSC_INVALID_INDEX; |
|
packet->cp_partial = false; |
|
|
|
/* Send a control message or XDP packet directly without accessing |
|
* msd (Multi-Send Data) field which may be changed during data packet |
|
* processing. |
|
*/ |
|
if (!skb || xdp_tx) |
|
return netvsc_send_pkt(device, packet, net_device, pb, skb); |
|
|
|
/* batch packets in send buffer if possible */ |
|
msdp = &nvchan->msd; |
|
if (msdp->pkt) |
|
msd_len = msdp->pkt->total_data_buflen; |
|
|
|
try_batch = msd_len > 0 && msdp->count < net_device->max_pkt; |
|
if (try_batch && msd_len + pktlen + net_device->pkt_align < |
|
net_device->send_section_size) { |
|
section_index = msdp->pkt->send_buf_index; |
|
|
|
} else if (try_batch && msd_len + packet->rmsg_size < |
|
net_device->send_section_size) { |
|
section_index = msdp->pkt->send_buf_index; |
|
packet->cp_partial = true; |
|
|
|
} else if (pktlen + net_device->pkt_align < |
|
net_device->send_section_size) { |
|
section_index = netvsc_get_next_send_section(net_device); |
|
if (unlikely(section_index == NETVSC_INVALID_INDEX)) { |
|
++ndev_ctx->eth_stats.tx_send_full; |
|
} else { |
|
move_pkt_msd(&msd_send, &msd_skb, msdp); |
|
msd_len = 0; |
|
} |
|
} |
|
|
|
/* Keep aggregating only if stack says more data is coming |
|
* and not doing mixed modes send and not flow blocked |
|
*/ |
|
xmit_more = netdev_xmit_more() && |
|
!packet->cp_partial && |
|
!netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx)); |
|
|
|
if (section_index != NETVSC_INVALID_INDEX) { |
|
netvsc_copy_to_send_buf(net_device, |
|
section_index, msd_len, |
|
packet, rndis_msg, pb, xmit_more); |
|
|
|
packet->send_buf_index = section_index; |
|
|
|
if (packet->cp_partial) { |
|
packet->page_buf_cnt -= packet->rmsg_pgcnt; |
|
packet->total_data_buflen = msd_len + packet->rmsg_size; |
|
} else { |
|
packet->page_buf_cnt = 0; |
|
packet->total_data_buflen += msd_len; |
|
} |
|
|
|
if (msdp->pkt) { |
|
packet->total_packets += msdp->pkt->total_packets; |
|
packet->total_bytes += msdp->pkt->total_bytes; |
|
} |
|
|
|
if (msdp->skb) |
|
dev_consume_skb_any(msdp->skb); |
|
|
|
if (xmit_more) { |
|
msdp->skb = skb; |
|
msdp->pkt = packet; |
|
msdp->count++; |
|
} else { |
|
cur_send = packet; |
|
msdp->skb = NULL; |
|
msdp->pkt = NULL; |
|
msdp->count = 0; |
|
} |
|
} else { |
|
move_pkt_msd(&msd_send, &msd_skb, msdp); |
|
cur_send = packet; |
|
} |
|
|
|
if (msd_send) { |
|
int m_ret = netvsc_send_pkt(device, msd_send, net_device, |
|
NULL, msd_skb); |
|
|
|
if (m_ret != 0) { |
|
netvsc_free_send_slot(net_device, |
|
msd_send->send_buf_index); |
|
dev_kfree_skb_any(msd_skb); |
|
} |
|
} |
|
|
|
if (cur_send) |
|
ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb); |
|
|
|
if (ret != 0 && section_index != NETVSC_INVALID_INDEX) |
|
netvsc_free_send_slot(net_device, section_index); |
|
|
|
return ret; |
|
} |
|
|
|
/* Send pending recv completions */ |
|
static int send_recv_completions(struct net_device *ndev, |
|
struct netvsc_device *nvdev, |
|
struct netvsc_channel *nvchan) |
|
{ |
|
struct multi_recv_comp *mrc = &nvchan->mrc; |
|
struct recv_comp_msg { |
|
struct nvsp_message_header hdr; |
|
u32 status; |
|
} __packed; |
|
struct recv_comp_msg msg = { |
|
.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE, |
|
}; |
|
int ret; |
|
|
|
while (mrc->first != mrc->next) { |
|
const struct recv_comp_data *rcd |
|
= mrc->slots + mrc->first; |
|
|
|
msg.status = rcd->status; |
|
ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg), |
|
rcd->tid, VM_PKT_COMP, 0); |
|
if (unlikely(ret)) { |
|
struct net_device_context *ndev_ctx = netdev_priv(ndev); |
|
|
|
++ndev_ctx->eth_stats.rx_comp_busy; |
|
return ret; |
|
} |
|
|
|
if (++mrc->first == nvdev->recv_completion_cnt) |
|
mrc->first = 0; |
|
} |
|
|
|
/* receive completion ring has been emptied */ |
|
if (unlikely(nvdev->destroy)) |
|
wake_up(&nvdev->wait_drain); |
|
|
|
return 0; |
|
} |
|
|
|
/* Count how many receive completions are outstanding */ |
|
static void recv_comp_slot_avail(const struct netvsc_device *nvdev, |
|
const struct multi_recv_comp *mrc, |
|
u32 *filled, u32 *avail) |
|
{ |
|
u32 count = nvdev->recv_completion_cnt; |
|
|
|
if (mrc->next >= mrc->first) |
|
*filled = mrc->next - mrc->first; |
|
else |
|
*filled = (count - mrc->first) + mrc->next; |
|
|
|
*avail = count - *filled - 1; |
|
} |
|
|
|
/* Add receive complete to ring to send to host. */ |
|
static void enq_receive_complete(struct net_device *ndev, |
|
struct netvsc_device *nvdev, u16 q_idx, |
|
u64 tid, u32 status) |
|
{ |
|
struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx]; |
|
struct multi_recv_comp *mrc = &nvchan->mrc; |
|
struct recv_comp_data *rcd; |
|
u32 filled, avail; |
|
|
|
recv_comp_slot_avail(nvdev, mrc, &filled, &avail); |
|
|
|
if (unlikely(filled > NAPI_POLL_WEIGHT)) { |
|
send_recv_completions(ndev, nvdev, nvchan); |
|
recv_comp_slot_avail(nvdev, mrc, &filled, &avail); |
|
} |
|
|
|
if (unlikely(!avail)) { |
|
netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n", |
|
q_idx, tid); |
|
return; |
|
} |
|
|
|
rcd = mrc->slots + mrc->next; |
|
rcd->tid = tid; |
|
rcd->status = status; |
|
|
|
if (++mrc->next == nvdev->recv_completion_cnt) |
|
mrc->next = 0; |
|
} |
|
|
|
static int netvsc_receive(struct net_device *ndev, |
|
struct netvsc_device *net_device, |
|
struct netvsc_channel *nvchan, |
|
const struct vmpacket_descriptor *desc) |
|
{ |
|
struct net_device_context *net_device_ctx = netdev_priv(ndev); |
|
struct vmbus_channel *channel = nvchan->channel; |
|
const struct vmtransfer_page_packet_header *vmxferpage_packet |
|
= container_of(desc, const struct vmtransfer_page_packet_header, d); |
|
const struct nvsp_message *nvsp = hv_pkt_data(desc); |
|
u32 msglen = hv_pkt_datalen(desc); |
|
u16 q_idx = channel->offermsg.offer.sub_channel_index; |
|
char *recv_buf = net_device->recv_buf; |
|
u32 status = NVSP_STAT_SUCCESS; |
|
int i; |
|
int count = 0; |
|
|
|
/* Ensure packet is big enough to read header fields */ |
|
if (msglen < sizeof(struct nvsp_message_header)) { |
|
netif_err(net_device_ctx, rx_err, ndev, |
|
"invalid nvsp header, length too small: %u\n", |
|
msglen); |
|
return 0; |
|
} |
|
|
|
/* Make sure this is a valid nvsp packet */ |
|
if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) { |
|
netif_err(net_device_ctx, rx_err, ndev, |
|
"Unknown nvsp packet type received %u\n", |
|
nvsp->hdr.msg_type); |
|
return 0; |
|
} |
|
|
|
/* Validate xfer page pkt header */ |
|
if ((desc->offset8 << 3) < sizeof(struct vmtransfer_page_packet_header)) { |
|
netif_err(net_device_ctx, rx_err, ndev, |
|
"Invalid xfer page pkt, offset too small: %u\n", |
|
desc->offset8 << 3); |
|
return 0; |
|
} |
|
|
|
if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) { |
|
netif_err(net_device_ctx, rx_err, ndev, |
|
"Invalid xfer page set id - expecting %x got %x\n", |
|
NETVSC_RECEIVE_BUFFER_ID, |
|
vmxferpage_packet->xfer_pageset_id); |
|
return 0; |
|
} |
|
|
|
count = vmxferpage_packet->range_cnt; |
|
|
|
/* Check count for a valid value */ |
|
if (NETVSC_XFER_HEADER_SIZE(count) > desc->offset8 << 3) { |
|
netif_err(net_device_ctx, rx_err, ndev, |
|
"Range count is not valid: %d\n", |
|
count); |
|
return 0; |
|
} |
|
|
|
/* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ |
|
for (i = 0; i < count; i++) { |
|
u32 offset = vmxferpage_packet->ranges[i].byte_offset; |
|
u32 buflen = vmxferpage_packet->ranges[i].byte_count; |
|
void *data; |
|
int ret; |
|
|
|
if (unlikely(offset > net_device->recv_buf_size || |
|
buflen > net_device->recv_buf_size - offset)) { |
|
nvchan->rsc.cnt = 0; |
|
status = NVSP_STAT_FAIL; |
|
netif_err(net_device_ctx, rx_err, ndev, |
|
"Packet offset:%u + len:%u too big\n", |
|
offset, buflen); |
|
|
|
continue; |
|
} |
|
|
|
/* We're going to copy (sections of) the packet into nvchan->recv_buf; |
|
* make sure that nvchan->recv_buf is large enough to hold the packet. |
|
*/ |
|
if (unlikely(buflen > net_device->recv_section_size)) { |
|
nvchan->rsc.cnt = 0; |
|
status = NVSP_STAT_FAIL; |
|
netif_err(net_device_ctx, rx_err, ndev, |
|
"Packet too big: buflen=%u recv_section_size=%u\n", |
|
buflen, net_device->recv_section_size); |
|
|
|
continue; |
|
} |
|
|
|
data = recv_buf + offset; |
|
|
|
nvchan->rsc.is_last = (i == count - 1); |
|
|
|
trace_rndis_recv(ndev, q_idx, data); |
|
|
|
/* Pass it to the upper layer */ |
|
ret = rndis_filter_receive(ndev, net_device, |
|
nvchan, data, buflen); |
|
|
|
if (unlikely(ret != NVSP_STAT_SUCCESS)) { |
|
/* Drop incomplete packet */ |
|
nvchan->rsc.cnt = 0; |
|
status = NVSP_STAT_FAIL; |
|
} |
|
} |
|
|
|
enq_receive_complete(ndev, net_device, q_idx, |
|
vmxferpage_packet->d.trans_id, status); |
|
|
|
return count; |
|
} |
|
|
|
static void netvsc_send_table(struct net_device *ndev, |
|
struct netvsc_device *nvscdev, |
|
const struct nvsp_message *nvmsg, |
|
u32 msglen) |
|
{ |
|
struct net_device_context *net_device_ctx = netdev_priv(ndev); |
|
u32 count, offset, *tab; |
|
int i; |
|
|
|
/* Ensure packet is big enough to read send_table fields */ |
|
if (msglen < sizeof(struct nvsp_message_header) + |
|
sizeof(struct nvsp_5_send_indirect_table)) { |
|
netdev_err(ndev, "nvsp_v5_msg length too small: %u\n", msglen); |
|
return; |
|
} |
|
|
|
count = nvmsg->msg.v5_msg.send_table.count; |
|
offset = nvmsg->msg.v5_msg.send_table.offset; |
|
|
|
if (count != VRSS_SEND_TAB_SIZE) { |
|
netdev_err(ndev, "Received wrong send-table size:%u\n", count); |
|
return; |
|
} |
|
|
|
/* If negotiated version <= NVSP_PROTOCOL_VERSION_6, the offset may be |
|
* wrong due to a host bug. So fix the offset here. |
|
*/ |
|
if (nvscdev->nvsp_version <= NVSP_PROTOCOL_VERSION_6 && |
|
msglen >= sizeof(struct nvsp_message_header) + |
|
sizeof(union nvsp_6_message_uber) + count * sizeof(u32)) |
|
offset = sizeof(struct nvsp_message_header) + |
|
sizeof(union nvsp_6_message_uber); |
|
|
|
/* Boundary check for all versions */ |
|
if (msglen < count * sizeof(u32) || offset > msglen - count * sizeof(u32)) { |
|
netdev_err(ndev, "Received send-table offset too big:%u\n", |
|
offset); |
|
return; |
|
} |
|
|
|
tab = (void *)nvmsg + offset; |
|
|
|
for (i = 0; i < count; i++) |
|
net_device_ctx->tx_table[i] = tab[i]; |
|
} |
|
|
|
static void netvsc_send_vf(struct net_device *ndev, |
|
const struct nvsp_message *nvmsg, |
|
u32 msglen) |
|
{ |
|
struct net_device_context *net_device_ctx = netdev_priv(ndev); |
|
|
|
/* Ensure packet is big enough to read its fields */ |
|
if (msglen < sizeof(struct nvsp_message_header) + |
|
sizeof(struct nvsp_4_send_vf_association)) { |
|
netdev_err(ndev, "nvsp_v4_msg length too small: %u\n", msglen); |
|
return; |
|
} |
|
|
|
net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated; |
|
net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial; |
|
netdev_info(ndev, "VF slot %u %s\n", |
|
net_device_ctx->vf_serial, |
|
net_device_ctx->vf_alloc ? "added" : "removed"); |
|
} |
|
|
|
static void netvsc_receive_inband(struct net_device *ndev, |
|
struct netvsc_device *nvscdev, |
|
const struct vmpacket_descriptor *desc) |
|
{ |
|
const struct nvsp_message *nvmsg = hv_pkt_data(desc); |
|
u32 msglen = hv_pkt_datalen(desc); |
|
|
|
/* Ensure packet is big enough to read header fields */ |
|
if (msglen < sizeof(struct nvsp_message_header)) { |
|
netdev_err(ndev, "inband nvsp_message length too small: %u\n", msglen); |
|
return; |
|
} |
|
|
|
switch (nvmsg->hdr.msg_type) { |
|
case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE: |
|
netvsc_send_table(ndev, nvscdev, nvmsg, msglen); |
|
break; |
|
|
|
case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION: |
|
if (hv_is_isolation_supported()) |
|
netdev_err(ndev, "Ignore VF_ASSOCIATION msg from the host supporting isolation\n"); |
|
else |
|
netvsc_send_vf(ndev, nvmsg, msglen); |
|
break; |
|
} |
|
} |
|
|
|
static int netvsc_process_raw_pkt(struct hv_device *device, |
|
struct netvsc_channel *nvchan, |
|
struct netvsc_device *net_device, |
|
struct net_device *ndev, |
|
const struct vmpacket_descriptor *desc, |
|
int budget) |
|
{ |
|
struct vmbus_channel *channel = nvchan->channel; |
|
const struct nvsp_message *nvmsg = hv_pkt_data(desc); |
|
|
|
trace_nvsp_recv(ndev, channel, nvmsg); |
|
|
|
switch (desc->type) { |
|
case VM_PKT_COMP: |
|
netvsc_send_completion(ndev, net_device, channel, desc, budget); |
|
break; |
|
|
|
case VM_PKT_DATA_USING_XFER_PAGES: |
|
return netvsc_receive(ndev, net_device, nvchan, desc); |
|
break; |
|
|
|
case VM_PKT_DATA_INBAND: |
|
netvsc_receive_inband(ndev, net_device, desc); |
|
break; |
|
|
|
default: |
|
netdev_err(ndev, "unhandled packet type %d, tid %llx\n", |
|
desc->type, desc->trans_id); |
|
break; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel) |
|
{ |
|
struct vmbus_channel *primary = channel->primary_channel; |
|
|
|
return primary ? primary->device_obj : channel->device_obj; |
|
} |
|
|
|
/* Network processing softirq |
|
* Process data in incoming ring buffer from host |
|
* Stops when ring is empty or budget is met or exceeded. |
|
*/ |
|
int netvsc_poll(struct napi_struct *napi, int budget) |
|
{ |
|
struct netvsc_channel *nvchan |
|
= container_of(napi, struct netvsc_channel, napi); |
|
struct netvsc_device *net_device = nvchan->net_device; |
|
struct vmbus_channel *channel = nvchan->channel; |
|
struct hv_device *device = netvsc_channel_to_device(channel); |
|
struct net_device *ndev = hv_get_drvdata(device); |
|
int work_done = 0; |
|
int ret; |
|
|
|
/* If starting a new interval */ |
|
if (!nvchan->desc) |
|
nvchan->desc = hv_pkt_iter_first(channel); |
|
|
|
while (nvchan->desc && work_done < budget) { |
|
work_done += netvsc_process_raw_pkt(device, nvchan, net_device, |
|
ndev, nvchan->desc, budget); |
|
nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc); |
|
} |
|
|
|
/* Send any pending receive completions */ |
|
ret = send_recv_completions(ndev, net_device, nvchan); |
|
|
|
/* If it did not exhaust NAPI budget this time |
|
* and not doing busy poll |
|
* then re-enable host interrupts |
|
* and reschedule if ring is not empty |
|
* or sending receive completion failed. |
|
*/ |
|
if (work_done < budget && |
|
napi_complete_done(napi, work_done) && |
|
(ret || hv_end_read(&channel->inbound)) && |
|
napi_schedule_prep(napi)) { |
|
hv_begin_read(&channel->inbound); |
|
__napi_schedule(napi); |
|
} |
|
|
|
/* Driver may overshoot since multiple packets per descriptor */ |
|
return min(work_done, budget); |
|
} |
|
|
|
/* Call back when data is available in host ring buffer. |
|
* Processing is deferred until network softirq (NAPI) |
|
*/ |
|
void netvsc_channel_cb(void *context) |
|
{ |
|
struct netvsc_channel *nvchan = context; |
|
struct vmbus_channel *channel = nvchan->channel; |
|
struct hv_ring_buffer_info *rbi = &channel->inbound; |
|
|
|
/* preload first vmpacket descriptor */ |
|
prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index); |
|
|
|
if (napi_schedule_prep(&nvchan->napi)) { |
|
/* disable interrupts from host */ |
|
hv_begin_read(rbi); |
|
|
|
__napi_schedule_irqoff(&nvchan->napi); |
|
} |
|
} |
|
|
|
/* |
|
* netvsc_device_add - Callback when the device belonging to this |
|
* driver is added |
|
*/ |
|
struct netvsc_device *netvsc_device_add(struct hv_device *device, |
|
const struct netvsc_device_info *device_info) |
|
{ |
|
int i, ret = 0; |
|
struct netvsc_device *net_device; |
|
struct net_device *ndev = hv_get_drvdata(device); |
|
struct net_device_context *net_device_ctx = netdev_priv(ndev); |
|
|
|
net_device = alloc_net_device(); |
|
if (!net_device) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
for (i = 0; i < VRSS_SEND_TAB_SIZE; i++) |
|
net_device_ctx->tx_table[i] = 0; |
|
|
|
/* Because the device uses NAPI, all the interrupt batching and |
|
* control is done via Net softirq, not the channel handling |
|
*/ |
|
set_channel_read_mode(device->channel, HV_CALL_ISR); |
|
|
|
/* If we're reopening the device we may have multiple queues, fill the |
|
* chn_table with the default channel to use it before subchannels are |
|
* opened. |
|
* Initialize the channel state before we open; |
|
* we can be interrupted as soon as we open the channel. |
|
*/ |
|
|
|
for (i = 0; i < VRSS_CHANNEL_MAX; i++) { |
|
struct netvsc_channel *nvchan = &net_device->chan_table[i]; |
|
|
|
nvchan->channel = device->channel; |
|
nvchan->net_device = net_device; |
|
u64_stats_init(&nvchan->tx_stats.syncp); |
|
u64_stats_init(&nvchan->rx_stats.syncp); |
|
|
|
ret = xdp_rxq_info_reg(&nvchan->xdp_rxq, ndev, i, 0); |
|
|
|
if (ret) { |
|
netdev_err(ndev, "xdp_rxq_info_reg fail: %d\n", ret); |
|
goto cleanup2; |
|
} |
|
|
|
ret = xdp_rxq_info_reg_mem_model(&nvchan->xdp_rxq, |
|
MEM_TYPE_PAGE_SHARED, NULL); |
|
|
|
if (ret) { |
|
netdev_err(ndev, "xdp reg_mem_model fail: %d\n", ret); |
|
goto cleanup2; |
|
} |
|
} |
|
|
|
/* Enable NAPI handler before init callbacks */ |
|
netif_napi_add(ndev, &net_device->chan_table[0].napi, |
|
netvsc_poll, NAPI_POLL_WEIGHT); |
|
|
|
/* Open the channel */ |
|
device->channel->rqstor_size = netvsc_rqstor_size(netvsc_ring_bytes); |
|
ret = vmbus_open(device->channel, netvsc_ring_bytes, |
|
netvsc_ring_bytes, NULL, 0, |
|
netvsc_channel_cb, net_device->chan_table); |
|
|
|
if (ret != 0) { |
|
netdev_err(ndev, "unable to open channel: %d\n", ret); |
|
goto cleanup; |
|
} |
|
|
|
/* Channel is opened */ |
|
netdev_dbg(ndev, "hv_netvsc channel opened successfully\n"); |
|
|
|
napi_enable(&net_device->chan_table[0].napi); |
|
|
|
/* Connect with the NetVsp */ |
|
ret = netvsc_connect_vsp(device, net_device, device_info); |
|
if (ret != 0) { |
|
netdev_err(ndev, |
|
"unable to connect to NetVSP - %d\n", ret); |
|
goto close; |
|
} |
|
|
|
/* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is |
|
* populated. |
|
*/ |
|
rcu_assign_pointer(net_device_ctx->nvdev, net_device); |
|
|
|
return net_device; |
|
|
|
close: |
|
RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); |
|
napi_disable(&net_device->chan_table[0].napi); |
|
|
|
/* Now, we can close the channel safely */ |
|
vmbus_close(device->channel); |
|
|
|
cleanup: |
|
netif_napi_del(&net_device->chan_table[0].napi); |
|
|
|
cleanup2: |
|
free_netvsc_device(&net_device->rcu); |
|
|
|
return ERR_PTR(ret); |
|
}
|
|
|