195fa0405SHaiyang Zhang /* 295fa0405SHaiyang Zhang * Copyright (c) 2009, Microsoft Corporation. 395fa0405SHaiyang Zhang * 495fa0405SHaiyang Zhang * This program is free software; you can redistribute it and/or modify it 595fa0405SHaiyang Zhang * under the terms and conditions of the GNU General Public License, 695fa0405SHaiyang Zhang * version 2, as published by the Free Software Foundation. 795fa0405SHaiyang Zhang * 895fa0405SHaiyang Zhang * This program is distributed in the hope it will be useful, but WITHOUT 995fa0405SHaiyang Zhang * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1095fa0405SHaiyang Zhang * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 1195fa0405SHaiyang Zhang * more details. 1295fa0405SHaiyang Zhang * 1395fa0405SHaiyang Zhang * You should have received a copy of the GNU General Public License along with 14adf8d3ffSJeff Kirsher * this program; if not, see <http://www.gnu.org/licenses/>. 1595fa0405SHaiyang Zhang * 1695fa0405SHaiyang Zhang * Authors: 1795fa0405SHaiyang Zhang * Haiyang Zhang <haiyangz@microsoft.com> 1895fa0405SHaiyang Zhang * Hank Janssen <hjanssen@microsoft.com> 1995fa0405SHaiyang Zhang */ 2095fa0405SHaiyang Zhang #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 2195fa0405SHaiyang Zhang 2295fa0405SHaiyang Zhang #include <linux/kernel.h> 2395fa0405SHaiyang Zhang #include <linux/sched.h> 2495fa0405SHaiyang Zhang #include <linux/wait.h> 2595fa0405SHaiyang Zhang #include <linux/mm.h> 2695fa0405SHaiyang Zhang #include <linux/delay.h> 2795fa0405SHaiyang Zhang #include <linux/io.h> 2895fa0405SHaiyang Zhang #include <linux/slab.h> 2995fa0405SHaiyang Zhang #include <linux/netdevice.h> 30f157e78dSHaiyang Zhang #include <linux/if_ether.h> 31c25aaf81SKY Srinivasan #include <asm/sync_bitops.h> 3295fa0405SHaiyang Zhang 3395fa0405SHaiyang Zhang #include "hyperv_net.h" 3495fa0405SHaiyang Zhang 3595fa0405SHaiyang Zhang 3695fa0405SHaiyang Zhang static struct netvsc_device *alloc_net_device(struct hv_device *device) 3795fa0405SHaiyang Zhang { 3895fa0405SHaiyang Zhang struct netvsc_device *net_device; 3995fa0405SHaiyang Zhang struct net_device *ndev = hv_get_drvdata(device); 407c3877f2SHaiyang Zhang int i; 4195fa0405SHaiyang Zhang 4295fa0405SHaiyang Zhang net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); 4395fa0405SHaiyang Zhang if (!net_device) 4495fa0405SHaiyang Zhang return NULL; 4595fa0405SHaiyang Zhang 46f90251c8SHaiyang Zhang net_device->cb_buffer = kzalloc(NETVSC_PACKET_SIZE, GFP_KERNEL); 47f90251c8SHaiyang Zhang if (!net_device->cb_buffer) { 48f90251c8SHaiyang Zhang kfree(net_device); 49f90251c8SHaiyang Zhang return NULL; 50f90251c8SHaiyang Zhang } 51f90251c8SHaiyang Zhang 52dc5cd894SHaiyang Zhang init_waitqueue_head(&net_device->wait_drain); 534d447c9aSHaiyang Zhang net_device->start_remove = false; 5495fa0405SHaiyang Zhang net_device->destroy = false; 5595fa0405SHaiyang Zhang net_device->dev = device; 5695fa0405SHaiyang Zhang net_device->ndev = ndev; 577c3877f2SHaiyang Zhang net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT; 587c3877f2SHaiyang Zhang net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT; 597c3877f2SHaiyang Zhang 607c3877f2SHaiyang Zhang for (i = 0; i < num_online_cpus(); i++) 617c3877f2SHaiyang Zhang spin_lock_init(&net_device->msd[i].lock); 6295fa0405SHaiyang Zhang 6395fa0405SHaiyang Zhang hv_set_drvdata(device, net_device); 6495fa0405SHaiyang Zhang return net_device; 6595fa0405SHaiyang Zhang } 6695fa0405SHaiyang Zhang 67f90251c8SHaiyang Zhang static void free_netvsc_device(struct netvsc_device *nvdev) 68f90251c8SHaiyang Zhang { 69f90251c8SHaiyang Zhang kfree(nvdev->cb_buffer); 70f90251c8SHaiyang Zhang kfree(nvdev); 71f90251c8SHaiyang Zhang } 72f90251c8SHaiyang Zhang 7395fa0405SHaiyang Zhang static struct netvsc_device *get_outbound_net_device(struct hv_device *device) 7495fa0405SHaiyang Zhang { 7595fa0405SHaiyang Zhang struct netvsc_device *net_device; 7695fa0405SHaiyang Zhang 7795fa0405SHaiyang Zhang net_device = hv_get_drvdata(device); 7895fa0405SHaiyang Zhang if (net_device && net_device->destroy) 7995fa0405SHaiyang Zhang net_device = NULL; 8095fa0405SHaiyang Zhang 8195fa0405SHaiyang Zhang return net_device; 8295fa0405SHaiyang Zhang } 8395fa0405SHaiyang Zhang 8495fa0405SHaiyang Zhang static struct netvsc_device *get_inbound_net_device(struct hv_device *device) 8595fa0405SHaiyang Zhang { 8695fa0405SHaiyang Zhang struct netvsc_device *net_device; 8795fa0405SHaiyang Zhang 8895fa0405SHaiyang Zhang net_device = hv_get_drvdata(device); 8995fa0405SHaiyang Zhang 9095fa0405SHaiyang Zhang if (!net_device) 9195fa0405SHaiyang Zhang goto get_in_err; 9295fa0405SHaiyang Zhang 9395fa0405SHaiyang Zhang if (net_device->destroy && 9495fa0405SHaiyang Zhang atomic_read(&net_device->num_outstanding_sends) == 0) 9595fa0405SHaiyang Zhang net_device = NULL; 9695fa0405SHaiyang Zhang 9795fa0405SHaiyang Zhang get_in_err: 9895fa0405SHaiyang Zhang return net_device; 9995fa0405SHaiyang Zhang } 10095fa0405SHaiyang Zhang 10195fa0405SHaiyang Zhang 102c25aaf81SKY Srinivasan static int netvsc_destroy_buf(struct netvsc_device *net_device) 10395fa0405SHaiyang Zhang { 10495fa0405SHaiyang Zhang struct nvsp_message *revoke_packet; 10595fa0405SHaiyang Zhang int ret = 0; 10695fa0405SHaiyang Zhang struct net_device *ndev = net_device->ndev; 10795fa0405SHaiyang Zhang 10895fa0405SHaiyang Zhang /* 10995fa0405SHaiyang Zhang * If we got a section count, it means we received a 11095fa0405SHaiyang Zhang * SendReceiveBufferComplete msg (ie sent 11195fa0405SHaiyang Zhang * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need 11295fa0405SHaiyang Zhang * to send a revoke msg here 11395fa0405SHaiyang Zhang */ 11495fa0405SHaiyang Zhang if (net_device->recv_section_cnt) { 11595fa0405SHaiyang Zhang /* Send the revoke receive buffer */ 11695fa0405SHaiyang Zhang revoke_packet = &net_device->revoke_packet; 11795fa0405SHaiyang Zhang memset(revoke_packet, 0, sizeof(struct nvsp_message)); 11895fa0405SHaiyang Zhang 11995fa0405SHaiyang Zhang revoke_packet->hdr.msg_type = 12095fa0405SHaiyang Zhang NVSP_MSG1_TYPE_REVOKE_RECV_BUF; 12195fa0405SHaiyang Zhang revoke_packet->msg.v1_msg. 12295fa0405SHaiyang Zhang revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 12395fa0405SHaiyang Zhang 12495fa0405SHaiyang Zhang ret = vmbus_sendpacket(net_device->dev->channel, 12595fa0405SHaiyang Zhang revoke_packet, 12695fa0405SHaiyang Zhang sizeof(struct nvsp_message), 12795fa0405SHaiyang Zhang (unsigned long)revoke_packet, 12895fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 0); 12995fa0405SHaiyang Zhang /* 13095fa0405SHaiyang Zhang * If we failed here, we might as well return and 13195fa0405SHaiyang Zhang * have a leak rather than continue and a bugchk 13295fa0405SHaiyang Zhang */ 13395fa0405SHaiyang Zhang if (ret != 0) { 13495fa0405SHaiyang Zhang netdev_err(ndev, "unable to send " 13595fa0405SHaiyang Zhang "revoke receive buffer to netvsp\n"); 13695fa0405SHaiyang Zhang return ret; 13795fa0405SHaiyang Zhang } 13895fa0405SHaiyang Zhang } 13995fa0405SHaiyang Zhang 14095fa0405SHaiyang Zhang /* Teardown the gpadl on the vsp end */ 14195fa0405SHaiyang Zhang if (net_device->recv_buf_gpadl_handle) { 14295fa0405SHaiyang Zhang ret = vmbus_teardown_gpadl(net_device->dev->channel, 14395fa0405SHaiyang Zhang net_device->recv_buf_gpadl_handle); 14495fa0405SHaiyang Zhang 14595fa0405SHaiyang Zhang /* If we failed here, we might as well return and have a leak 14695fa0405SHaiyang Zhang * rather than continue and a bugchk 14795fa0405SHaiyang Zhang */ 14895fa0405SHaiyang Zhang if (ret != 0) { 14995fa0405SHaiyang Zhang netdev_err(ndev, 15095fa0405SHaiyang Zhang "unable to teardown receive buffer's gpadl\n"); 15195fa0405SHaiyang Zhang return ret; 15295fa0405SHaiyang Zhang } 15395fa0405SHaiyang Zhang net_device->recv_buf_gpadl_handle = 0; 15495fa0405SHaiyang Zhang } 15595fa0405SHaiyang Zhang 15695fa0405SHaiyang Zhang if (net_device->recv_buf) { 15795fa0405SHaiyang Zhang /* Free up the receive buffer */ 158b679ef73SHaiyang Zhang vfree(net_device->recv_buf); 15995fa0405SHaiyang Zhang net_device->recv_buf = NULL; 16095fa0405SHaiyang Zhang } 16195fa0405SHaiyang Zhang 16295fa0405SHaiyang Zhang if (net_device->recv_section) { 16395fa0405SHaiyang Zhang net_device->recv_section_cnt = 0; 16495fa0405SHaiyang Zhang kfree(net_device->recv_section); 16595fa0405SHaiyang Zhang net_device->recv_section = NULL; 16695fa0405SHaiyang Zhang } 16795fa0405SHaiyang Zhang 168c25aaf81SKY Srinivasan /* Deal with the send buffer we may have setup. 169c25aaf81SKY Srinivasan * If we got a send section size, it means we received a 170c51ed182SHaiyang Zhang * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent 171c51ed182SHaiyang Zhang * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need 172c25aaf81SKY Srinivasan * to send a revoke msg here 173c25aaf81SKY Srinivasan */ 174c25aaf81SKY Srinivasan if (net_device->send_section_size) { 175c25aaf81SKY Srinivasan /* Send the revoke receive buffer */ 176c25aaf81SKY Srinivasan revoke_packet = &net_device->revoke_packet; 177c25aaf81SKY Srinivasan memset(revoke_packet, 0, sizeof(struct nvsp_message)); 178c25aaf81SKY Srinivasan 179c25aaf81SKY Srinivasan revoke_packet->hdr.msg_type = 180c25aaf81SKY Srinivasan NVSP_MSG1_TYPE_REVOKE_SEND_BUF; 181c51ed182SHaiyang Zhang revoke_packet->msg.v1_msg.revoke_send_buf.id = 182c51ed182SHaiyang Zhang NETVSC_SEND_BUFFER_ID; 183c25aaf81SKY Srinivasan 184c25aaf81SKY Srinivasan ret = vmbus_sendpacket(net_device->dev->channel, 185c25aaf81SKY Srinivasan revoke_packet, 186c25aaf81SKY Srinivasan sizeof(struct nvsp_message), 187c25aaf81SKY Srinivasan (unsigned long)revoke_packet, 188c25aaf81SKY Srinivasan VM_PKT_DATA_INBAND, 0); 189c25aaf81SKY Srinivasan /* If we failed here, we might as well return and 190c25aaf81SKY Srinivasan * have a leak rather than continue and a bugchk 191c25aaf81SKY Srinivasan */ 192c25aaf81SKY Srinivasan if (ret != 0) { 193c25aaf81SKY Srinivasan netdev_err(ndev, "unable to send " 194c25aaf81SKY Srinivasan "revoke send buffer to netvsp\n"); 195c25aaf81SKY Srinivasan return ret; 196c25aaf81SKY Srinivasan } 197c25aaf81SKY Srinivasan } 198c25aaf81SKY Srinivasan /* Teardown the gpadl on the vsp end */ 199c25aaf81SKY Srinivasan if (net_device->send_buf_gpadl_handle) { 200c25aaf81SKY Srinivasan ret = vmbus_teardown_gpadl(net_device->dev->channel, 201c25aaf81SKY Srinivasan net_device->send_buf_gpadl_handle); 202c25aaf81SKY Srinivasan 203c25aaf81SKY Srinivasan /* If we failed here, we might as well return and have a leak 204c25aaf81SKY Srinivasan * rather than continue and a bugchk 205c25aaf81SKY Srinivasan */ 206c25aaf81SKY Srinivasan if (ret != 0) { 207c25aaf81SKY Srinivasan netdev_err(ndev, 208c25aaf81SKY Srinivasan "unable to teardown send buffer's gpadl\n"); 209c25aaf81SKY Srinivasan return ret; 210c25aaf81SKY Srinivasan } 2112f18423dSDave Jones net_device->send_buf_gpadl_handle = 0; 212c25aaf81SKY Srinivasan } 213c25aaf81SKY Srinivasan if (net_device->send_buf) { 214c51ed182SHaiyang Zhang /* Free up the send buffer */ 21506b47aacSKY Srinivasan vfree(net_device->send_buf); 216c25aaf81SKY Srinivasan net_device->send_buf = NULL; 217c25aaf81SKY Srinivasan } 218c25aaf81SKY Srinivasan kfree(net_device->send_section_map); 219c25aaf81SKY Srinivasan 22095fa0405SHaiyang Zhang return ret; 22195fa0405SHaiyang Zhang } 22295fa0405SHaiyang Zhang 223c25aaf81SKY Srinivasan static int netvsc_init_buf(struct hv_device *device) 22495fa0405SHaiyang Zhang { 22595fa0405SHaiyang Zhang int ret = 0; 2267390fe9cSNicholas Mc Guire unsigned long t; 22795fa0405SHaiyang Zhang struct netvsc_device *net_device; 22895fa0405SHaiyang Zhang struct nvsp_message *init_packet; 22995fa0405SHaiyang Zhang struct net_device *ndev; 23095fa0405SHaiyang Zhang 23195fa0405SHaiyang Zhang net_device = get_outbound_net_device(device); 23295fa0405SHaiyang Zhang if (!net_device) 23395fa0405SHaiyang Zhang return -ENODEV; 23495fa0405SHaiyang Zhang ndev = net_device->ndev; 23595fa0405SHaiyang Zhang 236b679ef73SHaiyang Zhang net_device->recv_buf = vzalloc(net_device->recv_buf_size); 23795fa0405SHaiyang Zhang if (!net_device->recv_buf) { 23895fa0405SHaiyang Zhang netdev_err(ndev, "unable to allocate receive " 23995fa0405SHaiyang Zhang "buffer of size %d\n", net_device->recv_buf_size); 24095fa0405SHaiyang Zhang ret = -ENOMEM; 24195fa0405SHaiyang Zhang goto cleanup; 24295fa0405SHaiyang Zhang } 24395fa0405SHaiyang Zhang 24495fa0405SHaiyang Zhang /* 24595fa0405SHaiyang Zhang * Establish the gpadl handle for this buffer on this 24695fa0405SHaiyang Zhang * channel. Note: This call uses the vmbus connection rather 24795fa0405SHaiyang Zhang * than the channel to establish the gpadl handle. 24895fa0405SHaiyang Zhang */ 24995fa0405SHaiyang Zhang ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, 25095fa0405SHaiyang Zhang net_device->recv_buf_size, 25195fa0405SHaiyang Zhang &net_device->recv_buf_gpadl_handle); 25295fa0405SHaiyang Zhang if (ret != 0) { 25395fa0405SHaiyang Zhang netdev_err(ndev, 25495fa0405SHaiyang Zhang "unable to establish receive buffer's gpadl\n"); 25595fa0405SHaiyang Zhang goto cleanup; 25695fa0405SHaiyang Zhang } 25795fa0405SHaiyang Zhang 25895fa0405SHaiyang Zhang 25995fa0405SHaiyang Zhang /* Notify the NetVsp of the gpadl handle */ 26095fa0405SHaiyang Zhang init_packet = &net_device->channel_init_pkt; 26195fa0405SHaiyang Zhang 26295fa0405SHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 26395fa0405SHaiyang Zhang 26495fa0405SHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; 26595fa0405SHaiyang Zhang init_packet->msg.v1_msg.send_recv_buf. 26695fa0405SHaiyang Zhang gpadl_handle = net_device->recv_buf_gpadl_handle; 26795fa0405SHaiyang Zhang init_packet->msg.v1_msg. 26895fa0405SHaiyang Zhang send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 26995fa0405SHaiyang Zhang 27095fa0405SHaiyang Zhang /* Send the gpadl notification request */ 27195fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 27295fa0405SHaiyang Zhang sizeof(struct nvsp_message), 27395fa0405SHaiyang Zhang (unsigned long)init_packet, 27495fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 27595fa0405SHaiyang Zhang VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 27695fa0405SHaiyang Zhang if (ret != 0) { 27795fa0405SHaiyang Zhang netdev_err(ndev, 27895fa0405SHaiyang Zhang "unable to send receive buffer's gpadl to netvsp\n"); 27995fa0405SHaiyang Zhang goto cleanup; 28095fa0405SHaiyang Zhang } 28195fa0405SHaiyang Zhang 28295fa0405SHaiyang Zhang t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 28395fa0405SHaiyang Zhang BUG_ON(t == 0); 28495fa0405SHaiyang Zhang 28595fa0405SHaiyang Zhang 28695fa0405SHaiyang Zhang /* Check the response */ 28795fa0405SHaiyang Zhang if (init_packet->msg.v1_msg. 28895fa0405SHaiyang Zhang send_recv_buf_complete.status != NVSP_STAT_SUCCESS) { 28995fa0405SHaiyang Zhang netdev_err(ndev, "Unable to complete receive buffer " 29095fa0405SHaiyang Zhang "initialization with NetVsp - status %d\n", 29195fa0405SHaiyang Zhang init_packet->msg.v1_msg. 29295fa0405SHaiyang Zhang send_recv_buf_complete.status); 29395fa0405SHaiyang Zhang ret = -EINVAL; 29495fa0405SHaiyang Zhang goto cleanup; 29595fa0405SHaiyang Zhang } 29695fa0405SHaiyang Zhang 29795fa0405SHaiyang Zhang /* Parse the response */ 29895fa0405SHaiyang Zhang 29995fa0405SHaiyang Zhang net_device->recv_section_cnt = init_packet->msg. 30095fa0405SHaiyang Zhang v1_msg.send_recv_buf_complete.num_sections; 30195fa0405SHaiyang Zhang 302c1813200SHaiyang Zhang net_device->recv_section = kmemdup( 303c1813200SHaiyang Zhang init_packet->msg.v1_msg.send_recv_buf_complete.sections, 304c1813200SHaiyang Zhang net_device->recv_section_cnt * 305c1813200SHaiyang Zhang sizeof(struct nvsp_1_receive_buffer_section), 30695fa0405SHaiyang Zhang GFP_KERNEL); 30795fa0405SHaiyang Zhang if (net_device->recv_section == NULL) { 30895fa0405SHaiyang Zhang ret = -EINVAL; 30995fa0405SHaiyang Zhang goto cleanup; 31095fa0405SHaiyang Zhang } 31195fa0405SHaiyang Zhang 31295fa0405SHaiyang Zhang /* 31395fa0405SHaiyang Zhang * For 1st release, there should only be 1 section that represents the 31495fa0405SHaiyang Zhang * entire receive buffer 31595fa0405SHaiyang Zhang */ 31695fa0405SHaiyang Zhang if (net_device->recv_section_cnt != 1 || 31795fa0405SHaiyang Zhang net_device->recv_section->offset != 0) { 31895fa0405SHaiyang Zhang ret = -EINVAL; 31995fa0405SHaiyang Zhang goto cleanup; 32095fa0405SHaiyang Zhang } 32195fa0405SHaiyang Zhang 322c25aaf81SKY Srinivasan /* Now setup the send buffer. 323c25aaf81SKY Srinivasan */ 32406b47aacSKY Srinivasan net_device->send_buf = vzalloc(net_device->send_buf_size); 325c25aaf81SKY Srinivasan if (!net_device->send_buf) { 326c25aaf81SKY Srinivasan netdev_err(ndev, "unable to allocate send " 327c25aaf81SKY Srinivasan "buffer of size %d\n", net_device->send_buf_size); 328c25aaf81SKY Srinivasan ret = -ENOMEM; 329c25aaf81SKY Srinivasan goto cleanup; 330c25aaf81SKY Srinivasan } 331c25aaf81SKY Srinivasan 332c25aaf81SKY Srinivasan /* Establish the gpadl handle for this buffer on this 333c25aaf81SKY Srinivasan * channel. Note: This call uses the vmbus connection rather 334c25aaf81SKY Srinivasan * than the channel to establish the gpadl handle. 335c25aaf81SKY Srinivasan */ 336c25aaf81SKY Srinivasan ret = vmbus_establish_gpadl(device->channel, net_device->send_buf, 337c25aaf81SKY Srinivasan net_device->send_buf_size, 338c25aaf81SKY Srinivasan &net_device->send_buf_gpadl_handle); 339c25aaf81SKY Srinivasan if (ret != 0) { 340c25aaf81SKY Srinivasan netdev_err(ndev, 341c25aaf81SKY Srinivasan "unable to establish send buffer's gpadl\n"); 342c25aaf81SKY Srinivasan goto cleanup; 343c25aaf81SKY Srinivasan } 344c25aaf81SKY Srinivasan 345c25aaf81SKY Srinivasan /* Notify the NetVsp of the gpadl handle */ 346c25aaf81SKY Srinivasan init_packet = &net_device->channel_init_pkt; 347c25aaf81SKY Srinivasan memset(init_packet, 0, sizeof(struct nvsp_message)); 348c25aaf81SKY Srinivasan init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF; 349c51ed182SHaiyang Zhang init_packet->msg.v1_msg.send_send_buf.gpadl_handle = 350c25aaf81SKY Srinivasan net_device->send_buf_gpadl_handle; 351c51ed182SHaiyang Zhang init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID; 352c25aaf81SKY Srinivasan 353c25aaf81SKY Srinivasan /* Send the gpadl notification request */ 354c25aaf81SKY Srinivasan ret = vmbus_sendpacket(device->channel, init_packet, 355c25aaf81SKY Srinivasan sizeof(struct nvsp_message), 356c25aaf81SKY Srinivasan (unsigned long)init_packet, 357c25aaf81SKY Srinivasan VM_PKT_DATA_INBAND, 358c25aaf81SKY Srinivasan VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 359c25aaf81SKY Srinivasan if (ret != 0) { 360c25aaf81SKY Srinivasan netdev_err(ndev, 361c25aaf81SKY Srinivasan "unable to send send buffer's gpadl to netvsp\n"); 362c25aaf81SKY Srinivasan goto cleanup; 363c25aaf81SKY Srinivasan } 364c25aaf81SKY Srinivasan 365c25aaf81SKY Srinivasan t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 366c25aaf81SKY Srinivasan BUG_ON(t == 0); 367c25aaf81SKY Srinivasan 368c25aaf81SKY Srinivasan /* Check the response */ 369c25aaf81SKY Srinivasan if (init_packet->msg.v1_msg. 370c25aaf81SKY Srinivasan send_send_buf_complete.status != NVSP_STAT_SUCCESS) { 371c25aaf81SKY Srinivasan netdev_err(ndev, "Unable to complete send buffer " 372c25aaf81SKY Srinivasan "initialization with NetVsp - status %d\n", 373c25aaf81SKY Srinivasan init_packet->msg.v1_msg. 374c51ed182SHaiyang Zhang send_send_buf_complete.status); 375c25aaf81SKY Srinivasan ret = -EINVAL; 376c25aaf81SKY Srinivasan goto cleanup; 377c25aaf81SKY Srinivasan } 378c25aaf81SKY Srinivasan 379c25aaf81SKY Srinivasan /* Parse the response */ 380c25aaf81SKY Srinivasan net_device->send_section_size = init_packet->msg. 381c25aaf81SKY Srinivasan v1_msg.send_send_buf_complete.section_size; 382c25aaf81SKY Srinivasan 383c25aaf81SKY Srinivasan /* Section count is simply the size divided by the section size. 384c25aaf81SKY Srinivasan */ 385c25aaf81SKY Srinivasan net_device->send_section_cnt = 386c25aaf81SKY Srinivasan net_device->send_buf_size/net_device->send_section_size; 387c25aaf81SKY Srinivasan 388c25aaf81SKY Srinivasan dev_info(&device->device, "Send section size: %d, Section count:%d\n", 389c25aaf81SKY Srinivasan net_device->send_section_size, net_device->send_section_cnt); 390c25aaf81SKY Srinivasan 391c25aaf81SKY Srinivasan /* Setup state for managing the send buffer. */ 392c25aaf81SKY Srinivasan net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt, 393c25aaf81SKY Srinivasan BITS_PER_LONG); 394c25aaf81SKY Srinivasan 395c25aaf81SKY Srinivasan net_device->send_section_map = 396c25aaf81SKY Srinivasan kzalloc(net_device->map_words * sizeof(ulong), GFP_KERNEL); 397dd1d3f8fSWei Yongjun if (net_device->send_section_map == NULL) { 398dd1d3f8fSWei Yongjun ret = -ENOMEM; 399c25aaf81SKY Srinivasan goto cleanup; 400dd1d3f8fSWei Yongjun } 401c25aaf81SKY Srinivasan 40295fa0405SHaiyang Zhang goto exit; 40395fa0405SHaiyang Zhang 40495fa0405SHaiyang Zhang cleanup: 405c25aaf81SKY Srinivasan netvsc_destroy_buf(net_device); 40695fa0405SHaiyang Zhang 40795fa0405SHaiyang Zhang exit: 40895fa0405SHaiyang Zhang return ret; 40995fa0405SHaiyang Zhang } 41095fa0405SHaiyang Zhang 41195fa0405SHaiyang Zhang 412f157e78dSHaiyang Zhang /* Negotiate NVSP protocol version */ 413f157e78dSHaiyang Zhang static int negotiate_nvsp_ver(struct hv_device *device, 414f157e78dSHaiyang Zhang struct netvsc_device *net_device, 415f157e78dSHaiyang Zhang struct nvsp_message *init_packet, 416f157e78dSHaiyang Zhang u32 nvsp_ver) 41795fa0405SHaiyang Zhang { 4187390fe9cSNicholas Mc Guire int ret; 4197390fe9cSNicholas Mc Guire unsigned long t; 420f157e78dSHaiyang Zhang 421f157e78dSHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 422f157e78dSHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; 423f157e78dSHaiyang Zhang init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; 424f157e78dSHaiyang Zhang init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; 425f157e78dSHaiyang Zhang 426f157e78dSHaiyang Zhang /* Send the init request */ 427f157e78dSHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 428f157e78dSHaiyang Zhang sizeof(struct nvsp_message), 429f157e78dSHaiyang Zhang (unsigned long)init_packet, 430f157e78dSHaiyang Zhang VM_PKT_DATA_INBAND, 431f157e78dSHaiyang Zhang VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 432f157e78dSHaiyang Zhang 433f157e78dSHaiyang Zhang if (ret != 0) 434f157e78dSHaiyang Zhang return ret; 435f157e78dSHaiyang Zhang 436f157e78dSHaiyang Zhang t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 437f157e78dSHaiyang Zhang 438f157e78dSHaiyang Zhang if (t == 0) 439f157e78dSHaiyang Zhang return -ETIMEDOUT; 440f157e78dSHaiyang Zhang 441f157e78dSHaiyang Zhang if (init_packet->msg.init_msg.init_complete.status != 442f157e78dSHaiyang Zhang NVSP_STAT_SUCCESS) 443f157e78dSHaiyang Zhang return -EINVAL; 444f157e78dSHaiyang Zhang 445a1eabb01SHaiyang Zhang if (nvsp_ver == NVSP_PROTOCOL_VERSION_1) 446f157e78dSHaiyang Zhang return 0; 447f157e78dSHaiyang Zhang 448f157e78dSHaiyang Zhang /* NVSPv2 only: Send NDIS config */ 449f157e78dSHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 450f157e78dSHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; 4514d3c9d37SHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu + 4524d3c9d37SHaiyang Zhang ETH_HLEN; 4531f5f3a75SHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; 454f157e78dSHaiyang Zhang 455f157e78dSHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 456f157e78dSHaiyang Zhang sizeof(struct nvsp_message), 457f157e78dSHaiyang Zhang (unsigned long)init_packet, 458f157e78dSHaiyang Zhang VM_PKT_DATA_INBAND, 0); 459f157e78dSHaiyang Zhang 460f157e78dSHaiyang Zhang return ret; 461f157e78dSHaiyang Zhang } 462f157e78dSHaiyang Zhang 463f157e78dSHaiyang Zhang static int netvsc_connect_vsp(struct hv_device *device) 464f157e78dSHaiyang Zhang { 465f157e78dSHaiyang Zhang int ret; 46695fa0405SHaiyang Zhang struct netvsc_device *net_device; 46795fa0405SHaiyang Zhang struct nvsp_message *init_packet; 46895fa0405SHaiyang Zhang int ndis_version; 46995fa0405SHaiyang Zhang struct net_device *ndev; 470a1eabb01SHaiyang Zhang u32 ver_list[] = { NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2, 471a1eabb01SHaiyang Zhang NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 }; 472a1eabb01SHaiyang Zhang int i, num_ver = 4; /* number of different NVSP versions */ 47395fa0405SHaiyang Zhang 47495fa0405SHaiyang Zhang net_device = get_outbound_net_device(device); 47595fa0405SHaiyang Zhang if (!net_device) 47695fa0405SHaiyang Zhang return -ENODEV; 47795fa0405SHaiyang Zhang ndev = net_device->ndev; 47895fa0405SHaiyang Zhang 47995fa0405SHaiyang Zhang init_packet = &net_device->channel_init_pkt; 48095fa0405SHaiyang Zhang 481f157e78dSHaiyang Zhang /* Negotiate the latest NVSP protocol supported */ 482a1eabb01SHaiyang Zhang for (i = num_ver - 1; i >= 0; i--) 483f157e78dSHaiyang Zhang if (negotiate_nvsp_ver(device, net_device, init_packet, 484a1eabb01SHaiyang Zhang ver_list[i]) == 0) { 485a1eabb01SHaiyang Zhang net_device->nvsp_version = ver_list[i]; 486a1eabb01SHaiyang Zhang break; 487a1eabb01SHaiyang Zhang } 488a1eabb01SHaiyang Zhang 489a1eabb01SHaiyang Zhang if (i < 0) { 49095fa0405SHaiyang Zhang ret = -EPROTO; 49195fa0405SHaiyang Zhang goto cleanup; 49295fa0405SHaiyang Zhang } 493f157e78dSHaiyang Zhang 494f157e78dSHaiyang Zhang pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); 495f157e78dSHaiyang Zhang 49695fa0405SHaiyang Zhang /* Send the ndis version */ 49795fa0405SHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 49895fa0405SHaiyang Zhang 499a1eabb01SHaiyang Zhang if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4) 5001f73db49SKY Srinivasan ndis_version = 0x00060001; 501a1eabb01SHaiyang Zhang else 502a1eabb01SHaiyang Zhang ndis_version = 0x0006001e; 50395fa0405SHaiyang Zhang 50495fa0405SHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; 50595fa0405SHaiyang Zhang init_packet->msg.v1_msg. 50695fa0405SHaiyang Zhang send_ndis_ver.ndis_major_ver = 50795fa0405SHaiyang Zhang (ndis_version & 0xFFFF0000) >> 16; 50895fa0405SHaiyang Zhang init_packet->msg.v1_msg. 50995fa0405SHaiyang Zhang send_ndis_ver.ndis_minor_ver = 51095fa0405SHaiyang Zhang ndis_version & 0xFFFF; 51195fa0405SHaiyang Zhang 51295fa0405SHaiyang Zhang /* Send the init request */ 51395fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 51495fa0405SHaiyang Zhang sizeof(struct nvsp_message), 51595fa0405SHaiyang Zhang (unsigned long)init_packet, 51695fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 0); 51795fa0405SHaiyang Zhang if (ret != 0) 51895fa0405SHaiyang Zhang goto cleanup; 51995fa0405SHaiyang Zhang 52095fa0405SHaiyang Zhang /* Post the big receive buffer to NetVSP */ 52199d3016dSHaiyang Zhang if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2) 52299d3016dSHaiyang Zhang net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY; 52399d3016dSHaiyang Zhang else 52499d3016dSHaiyang Zhang net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; 525c25aaf81SKY Srinivasan net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE; 52699d3016dSHaiyang Zhang 527c25aaf81SKY Srinivasan ret = netvsc_init_buf(device); 52895fa0405SHaiyang Zhang 52995fa0405SHaiyang Zhang cleanup: 53095fa0405SHaiyang Zhang return ret; 53195fa0405SHaiyang Zhang } 53295fa0405SHaiyang Zhang 53395fa0405SHaiyang Zhang static void netvsc_disconnect_vsp(struct netvsc_device *net_device) 53495fa0405SHaiyang Zhang { 535c25aaf81SKY Srinivasan netvsc_destroy_buf(net_device); 53695fa0405SHaiyang Zhang } 53795fa0405SHaiyang Zhang 53895fa0405SHaiyang Zhang /* 53995fa0405SHaiyang Zhang * netvsc_device_remove - Callback when the root bus device is removed 54095fa0405SHaiyang Zhang */ 54195fa0405SHaiyang Zhang int netvsc_device_remove(struct hv_device *device) 54295fa0405SHaiyang Zhang { 54395fa0405SHaiyang Zhang struct netvsc_device *net_device; 54495fa0405SHaiyang Zhang unsigned long flags; 54595fa0405SHaiyang Zhang 54695fa0405SHaiyang Zhang net_device = hv_get_drvdata(device); 54795fa0405SHaiyang Zhang 54895fa0405SHaiyang Zhang netvsc_disconnect_vsp(net_device); 54995fa0405SHaiyang Zhang 55095fa0405SHaiyang Zhang /* 55195fa0405SHaiyang Zhang * Since we have already drained, we don't need to busy wait 55295fa0405SHaiyang Zhang * as was done in final_release_stor_device() 55395fa0405SHaiyang Zhang * Note that we cannot set the ext pointer to NULL until 55495fa0405SHaiyang Zhang * we have drained - to drain the outgoing packets, we need to 55595fa0405SHaiyang Zhang * allow incoming packets. 55695fa0405SHaiyang Zhang */ 55795fa0405SHaiyang Zhang 55895fa0405SHaiyang Zhang spin_lock_irqsave(&device->channel->inbound_lock, flags); 55995fa0405SHaiyang Zhang hv_set_drvdata(device, NULL); 56095fa0405SHaiyang Zhang spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 56195fa0405SHaiyang Zhang 56295fa0405SHaiyang Zhang /* 56395fa0405SHaiyang Zhang * At this point, no one should be accessing net_device 56495fa0405SHaiyang Zhang * except in here 56595fa0405SHaiyang Zhang */ 56695fa0405SHaiyang Zhang dev_notice(&device->device, "net device safe to remove\n"); 56795fa0405SHaiyang Zhang 56895fa0405SHaiyang Zhang /* Now, we can close the channel safely */ 56995fa0405SHaiyang Zhang vmbus_close(device->channel); 57095fa0405SHaiyang Zhang 57195fa0405SHaiyang Zhang /* Release all resources */ 5725b54dac8SHaiyang Zhang vfree(net_device->sub_cb_buf); 573f90251c8SHaiyang Zhang free_netvsc_device(net_device); 57495fa0405SHaiyang Zhang return 0; 57595fa0405SHaiyang Zhang } 57695fa0405SHaiyang Zhang 57733be96e4SHaiyang Zhang 57833be96e4SHaiyang Zhang #define RING_AVAIL_PERCENT_HIWATER 20 57933be96e4SHaiyang Zhang #define RING_AVAIL_PERCENT_LOWATER 10 58033be96e4SHaiyang Zhang 58133be96e4SHaiyang Zhang /* 58233be96e4SHaiyang Zhang * Get the percentage of available bytes to write in the ring. 58333be96e4SHaiyang Zhang * The return value is in range from 0 to 100. 58433be96e4SHaiyang Zhang */ 58533be96e4SHaiyang Zhang static inline u32 hv_ringbuf_avail_percent( 58633be96e4SHaiyang Zhang struct hv_ring_buffer_info *ring_info) 58733be96e4SHaiyang Zhang { 58833be96e4SHaiyang Zhang u32 avail_read, avail_write; 58933be96e4SHaiyang Zhang 59033be96e4SHaiyang Zhang hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); 59133be96e4SHaiyang Zhang 59233be96e4SHaiyang Zhang return avail_write * 100 / ring_info->ring_datasize; 59333be96e4SHaiyang Zhang } 59433be96e4SHaiyang Zhang 595c25aaf81SKY Srinivasan static inline void netvsc_free_send_slot(struct netvsc_device *net_device, 596c25aaf81SKY Srinivasan u32 index) 597c25aaf81SKY Srinivasan { 598c25aaf81SKY Srinivasan sync_change_bit(index, net_device->send_section_map); 599c25aaf81SKY Srinivasan } 600c25aaf81SKY Srinivasan 60197c1723aSKY Srinivasan static void netvsc_send_completion(struct netvsc_device *net_device, 60297c1723aSKY Srinivasan struct hv_device *device, 60395fa0405SHaiyang Zhang struct vmpacket_descriptor *packet) 60495fa0405SHaiyang Zhang { 60595fa0405SHaiyang Zhang struct nvsp_message *nvsp_packet; 60695fa0405SHaiyang Zhang struct hv_netvsc_packet *nvsc_packet; 60795fa0405SHaiyang Zhang struct net_device *ndev; 608c25aaf81SKY Srinivasan u32 send_index; 60995fa0405SHaiyang Zhang 61095fa0405SHaiyang Zhang ndev = net_device->ndev; 61195fa0405SHaiyang Zhang 61295fa0405SHaiyang Zhang nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 61395fa0405SHaiyang Zhang (packet->offset8 << 3)); 61495fa0405SHaiyang Zhang 61595fa0405SHaiyang Zhang if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) || 61695fa0405SHaiyang Zhang (nvsp_packet->hdr.msg_type == 61795fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) || 61895fa0405SHaiyang Zhang (nvsp_packet->hdr.msg_type == 6195b54dac8SHaiyang Zhang NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE) || 6205b54dac8SHaiyang Zhang (nvsp_packet->hdr.msg_type == 6215b54dac8SHaiyang Zhang NVSP_MSG5_TYPE_SUBCHANNEL)) { 62295fa0405SHaiyang Zhang /* Copy the response back */ 62395fa0405SHaiyang Zhang memcpy(&net_device->channel_init_pkt, nvsp_packet, 62495fa0405SHaiyang Zhang sizeof(struct nvsp_message)); 62595fa0405SHaiyang Zhang complete(&net_device->channel_init_wait); 62695fa0405SHaiyang Zhang } else if (nvsp_packet->hdr.msg_type == 62795fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) { 62833be96e4SHaiyang Zhang int num_outstanding_sends; 6295b54dac8SHaiyang Zhang u16 q_idx = 0; 6305b54dac8SHaiyang Zhang struct vmbus_channel *channel = device->channel; 6315b54dac8SHaiyang Zhang int queue_sends; 63233be96e4SHaiyang Zhang 63395fa0405SHaiyang Zhang /* Get the send context */ 63495fa0405SHaiyang Zhang nvsc_packet = (struct hv_netvsc_packet *)(unsigned long) 63595fa0405SHaiyang Zhang packet->trans_id; 63695fa0405SHaiyang Zhang 63795fa0405SHaiyang Zhang /* Notify the layer above us */ 6385b54dac8SHaiyang Zhang if (nvsc_packet) { 639c25aaf81SKY Srinivasan send_index = nvsc_packet->send_buf_index; 640c25aaf81SKY Srinivasan if (send_index != NETVSC_INVALID_INDEX) 641c25aaf81SKY Srinivasan netvsc_free_send_slot(net_device, send_index); 6425b54dac8SHaiyang Zhang q_idx = nvsc_packet->q_idx; 6435b54dac8SHaiyang Zhang channel = nvsc_packet->channel; 644893f6627SHaiyang Zhang nvsc_packet->send_completion(nvsc_packet-> 645f1ea3cd7SHaiyang Zhang send_completion_ctx); 6465b54dac8SHaiyang Zhang } 64795fa0405SHaiyang Zhang 64833be96e4SHaiyang Zhang num_outstanding_sends = 64933be96e4SHaiyang Zhang atomic_dec_return(&net_device->num_outstanding_sends); 6505b54dac8SHaiyang Zhang queue_sends = atomic_dec_return(&net_device-> 6515b54dac8SHaiyang Zhang queue_sends[q_idx]); 6521d06825bSHaiyang Zhang 653dc5cd894SHaiyang Zhang if (net_device->destroy && num_outstanding_sends == 0) 654dc5cd894SHaiyang Zhang wake_up(&net_device->wait_drain); 655dc5cd894SHaiyang Zhang 6565b54dac8SHaiyang Zhang if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) && 6575b54dac8SHaiyang Zhang !net_device->start_remove && 6585b54dac8SHaiyang Zhang (hv_ringbuf_avail_percent(&channel->outbound) > 6595b54dac8SHaiyang Zhang RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) 6605b54dac8SHaiyang Zhang netif_tx_wake_queue(netdev_get_tx_queue( 6615b54dac8SHaiyang Zhang ndev, q_idx)); 66295fa0405SHaiyang Zhang } else { 66395fa0405SHaiyang Zhang netdev_err(ndev, "Unknown send completion packet type- " 66495fa0405SHaiyang Zhang "%d received!!\n", nvsp_packet->hdr.msg_type); 66595fa0405SHaiyang Zhang } 66695fa0405SHaiyang Zhang 66795fa0405SHaiyang Zhang } 66895fa0405SHaiyang Zhang 669c25aaf81SKY Srinivasan static u32 netvsc_get_next_send_section(struct netvsc_device *net_device) 670c25aaf81SKY Srinivasan { 671c25aaf81SKY Srinivasan unsigned long index; 672c25aaf81SKY Srinivasan u32 max_words = net_device->map_words; 673c25aaf81SKY Srinivasan unsigned long *map_addr = (unsigned long *)net_device->send_section_map; 674c25aaf81SKY Srinivasan u32 section_cnt = net_device->send_section_cnt; 675c25aaf81SKY Srinivasan int ret_val = NETVSC_INVALID_INDEX; 676c25aaf81SKY Srinivasan int i; 677c25aaf81SKY Srinivasan int prev_val; 678c25aaf81SKY Srinivasan 679c25aaf81SKY Srinivasan for (i = 0; i < max_words; i++) { 680c25aaf81SKY Srinivasan if (!~(map_addr[i])) 681c25aaf81SKY Srinivasan continue; 682c25aaf81SKY Srinivasan index = ffz(map_addr[i]); 683c25aaf81SKY Srinivasan prev_val = sync_test_and_set_bit(index, &map_addr[i]); 684c25aaf81SKY Srinivasan if (prev_val) 685c25aaf81SKY Srinivasan continue; 686c25aaf81SKY Srinivasan if ((index + (i * BITS_PER_LONG)) >= section_cnt) 687c25aaf81SKY Srinivasan break; 688c25aaf81SKY Srinivasan ret_val = (index + (i * BITS_PER_LONG)); 689c25aaf81SKY Srinivasan break; 690c25aaf81SKY Srinivasan } 691c25aaf81SKY Srinivasan return ret_val; 692c25aaf81SKY Srinivasan } 693c25aaf81SKY Srinivasan 694da19fcd0SLad, Prabhakar static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device, 695c25aaf81SKY Srinivasan unsigned int section_index, 6967c3877f2SHaiyang Zhang u32 pend_size, 697c25aaf81SKY Srinivasan struct hv_netvsc_packet *packet) 698c25aaf81SKY Srinivasan { 699c25aaf81SKY Srinivasan char *start = net_device->send_buf; 7007c3877f2SHaiyang Zhang char *dest = start + (section_index * net_device->send_section_size) 7017c3877f2SHaiyang Zhang + pend_size; 702c25aaf81SKY Srinivasan int i; 703c25aaf81SKY Srinivasan u32 msg_size = 0; 7047c3877f2SHaiyang Zhang u32 padding = 0; 7057c3877f2SHaiyang Zhang u32 remain = packet->total_data_buflen % net_device->pkt_align; 706aa0a34beSHaiyang Zhang u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt : 707aa0a34beSHaiyang Zhang packet->page_buf_cnt; 7087c3877f2SHaiyang Zhang 7097c3877f2SHaiyang Zhang /* Add padding */ 710aa0a34beSHaiyang Zhang if (packet->is_data_pkt && packet->xmit_more && remain && 711aa0a34beSHaiyang Zhang !packet->cp_partial) { 7127c3877f2SHaiyang Zhang padding = net_device->pkt_align - remain; 7137c3877f2SHaiyang Zhang packet->rndis_msg->msg_len += padding; 7147c3877f2SHaiyang Zhang packet->total_data_buflen += padding; 7157c3877f2SHaiyang Zhang } 716c25aaf81SKY Srinivasan 717aa0a34beSHaiyang Zhang for (i = 0; i < page_count; i++) { 718c25aaf81SKY Srinivasan char *src = phys_to_virt(packet->page_buf[i].pfn << PAGE_SHIFT); 719c25aaf81SKY Srinivasan u32 offset = packet->page_buf[i].offset; 720c25aaf81SKY Srinivasan u32 len = packet->page_buf[i].len; 721c25aaf81SKY Srinivasan 722c25aaf81SKY Srinivasan memcpy(dest, (src + offset), len); 723c25aaf81SKY Srinivasan msg_size += len; 724c25aaf81SKY Srinivasan dest += len; 725c25aaf81SKY Srinivasan } 7267c3877f2SHaiyang Zhang 7277c3877f2SHaiyang Zhang if (padding) { 7287c3877f2SHaiyang Zhang memset(dest, 0, padding); 7297c3877f2SHaiyang Zhang msg_size += padding; 7307c3877f2SHaiyang Zhang } 7317c3877f2SHaiyang Zhang 732c25aaf81SKY Srinivasan return msg_size; 733c25aaf81SKY Srinivasan } 734c25aaf81SKY Srinivasan 7357c3877f2SHaiyang Zhang static inline int netvsc_send_pkt( 7367c3877f2SHaiyang Zhang struct hv_netvsc_packet *packet, 7377c3877f2SHaiyang Zhang struct netvsc_device *net_device) 73895fa0405SHaiyang Zhang { 7397c3877f2SHaiyang Zhang struct nvsp_message nvmsg; 7407c3877f2SHaiyang Zhang struct vmbus_channel *out_channel = packet->channel; 7413a67c9ccSKY Srinivasan u16 q_idx = packet->q_idx; 7427c3877f2SHaiyang Zhang struct net_device *ndev = net_device->ndev; 7437c3877f2SHaiyang Zhang u64 req_id; 7447c3877f2SHaiyang Zhang int ret; 745aa0a34beSHaiyang Zhang struct hv_page_buffer *pgbuf; 74682fa3c77SKY Srinivasan u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound); 747c25aaf81SKY Srinivasan 7487c3877f2SHaiyang Zhang nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; 74995fa0405SHaiyang Zhang if (packet->is_data_pkt) { 75095fa0405SHaiyang Zhang /* 0 is RMC_DATA; */ 7517c3877f2SHaiyang Zhang nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 0; 75295fa0405SHaiyang Zhang } else { 75395fa0405SHaiyang Zhang /* 1 is RMC_CONTROL; */ 7547c3877f2SHaiyang Zhang nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 1; 75595fa0405SHaiyang Zhang } 75695fa0405SHaiyang Zhang 7577c3877f2SHaiyang Zhang nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_index = 7587c3877f2SHaiyang Zhang packet->send_buf_index; 7597c3877f2SHaiyang Zhang if (packet->send_buf_index == NETVSC_INVALID_INDEX) 7607c3877f2SHaiyang Zhang nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; 7617c3877f2SHaiyang Zhang else 7627c3877f2SHaiyang Zhang nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 7637c3877f2SHaiyang Zhang packet->total_data_buflen; 76495fa0405SHaiyang Zhang 765893f6627SHaiyang Zhang if (packet->send_completion) 76600ca8f0cSHaiyang Zhang req_id = (ulong)packet; 767f1ea3cd7SHaiyang Zhang else 768f1ea3cd7SHaiyang Zhang req_id = 0; 769f1ea3cd7SHaiyang Zhang 770c3582a2cSHaiyang Zhang if (out_channel->rescind) 771c3582a2cSHaiyang Zhang return -ENODEV; 772c3582a2cSHaiyang Zhang 77382fa3c77SKY Srinivasan /* 77482fa3c77SKY Srinivasan * It is possible that once we successfully place this packet 77582fa3c77SKY Srinivasan * on the ringbuffer, we may stop the queue. In that case, we want 77682fa3c77SKY Srinivasan * to notify the host independent of the xmit_more flag. We don't 77782fa3c77SKY Srinivasan * need to be precise here; in the worst case we may signal the host 77882fa3c77SKY Srinivasan * unnecessarily. 77982fa3c77SKY Srinivasan */ 78082fa3c77SKY Srinivasan if (ring_avail < (RING_AVAIL_PERCENT_LOWATER + 1)) 78182fa3c77SKY Srinivasan packet->xmit_more = false; 78282fa3c77SKY Srinivasan 78395fa0405SHaiyang Zhang if (packet->page_buf_cnt) { 784aa0a34beSHaiyang Zhang pgbuf = packet->cp_partial ? packet->page_buf + 785aa0a34beSHaiyang Zhang packet->rmsg_pgcnt : packet->page_buf; 78682fa3c77SKY Srinivasan ret = vmbus_sendpacket_pagebuffer_ctl(out_channel, 787aa0a34beSHaiyang Zhang pgbuf, 78895fa0405SHaiyang Zhang packet->page_buf_cnt, 7897c3877f2SHaiyang Zhang &nvmsg, 79095fa0405SHaiyang Zhang sizeof(struct nvsp_message), 79182fa3c77SKY Srinivasan req_id, 79282fa3c77SKY Srinivasan VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED, 79382fa3c77SKY Srinivasan !packet->xmit_more); 79495fa0405SHaiyang Zhang } else { 79582fa3c77SKY Srinivasan ret = vmbus_sendpacket_ctl(out_channel, &nvmsg, 79695fa0405SHaiyang Zhang sizeof(struct nvsp_message), 797f1ea3cd7SHaiyang Zhang req_id, 79895fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 79982fa3c77SKY Srinivasan VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED, 80082fa3c77SKY Srinivasan !packet->xmit_more); 80195fa0405SHaiyang Zhang } 80295fa0405SHaiyang Zhang 8031d06825bSHaiyang Zhang if (ret == 0) { 8041d06825bSHaiyang Zhang atomic_inc(&net_device->num_outstanding_sends); 8053a67c9ccSKY Srinivasan atomic_inc(&net_device->queue_sends[q_idx]); 8065b54dac8SHaiyang Zhang 80782fa3c77SKY Srinivasan if (ring_avail < RING_AVAIL_PERCENT_LOWATER) { 80882fa3c77SKY Srinivasan netif_tx_stop_queue(netdev_get_tx_queue(ndev, q_idx)); 8095b54dac8SHaiyang Zhang 81033be96e4SHaiyang Zhang if (atomic_read(&net_device-> 8113a67c9ccSKY Srinivasan queue_sends[q_idx]) < 1) 8125b54dac8SHaiyang Zhang netif_tx_wake_queue(netdev_get_tx_queue( 8133a67c9ccSKY Srinivasan ndev, q_idx)); 81433be96e4SHaiyang Zhang } 8151d06825bSHaiyang Zhang } else if (ret == -EAGAIN) { 8165b54dac8SHaiyang Zhang netif_tx_stop_queue(netdev_get_tx_queue( 8173a67c9ccSKY Srinivasan ndev, q_idx)); 8183a67c9ccSKY Srinivasan if (atomic_read(&net_device->queue_sends[q_idx]) < 1) { 8195b54dac8SHaiyang Zhang netif_tx_wake_queue(netdev_get_tx_queue( 8203a67c9ccSKY Srinivasan ndev, q_idx)); 82133be96e4SHaiyang Zhang ret = -ENOSPC; 82233be96e4SHaiyang Zhang } 8231d06825bSHaiyang Zhang } else { 82495fa0405SHaiyang Zhang netdev_err(ndev, "Unable to send packet %p ret %d\n", 82595fa0405SHaiyang Zhang packet, ret); 8261d06825bSHaiyang Zhang } 82795fa0405SHaiyang Zhang 8287c3877f2SHaiyang Zhang return ret; 8297c3877f2SHaiyang Zhang } 8307c3877f2SHaiyang Zhang 8317c3877f2SHaiyang Zhang int netvsc_send(struct hv_device *device, 8327c3877f2SHaiyang Zhang struct hv_netvsc_packet *packet) 8337c3877f2SHaiyang Zhang { 8347c3877f2SHaiyang Zhang struct netvsc_device *net_device; 8357c3877f2SHaiyang Zhang int ret = 0, m_ret = 0; 8367c3877f2SHaiyang Zhang struct vmbus_channel *out_channel; 8377c3877f2SHaiyang Zhang u16 q_idx = packet->q_idx; 8387c3877f2SHaiyang Zhang u32 pktlen = packet->total_data_buflen, msd_len = 0; 8397c3877f2SHaiyang Zhang unsigned int section_index = NETVSC_INVALID_INDEX; 8407c3877f2SHaiyang Zhang struct sk_buff *skb = NULL; 8417c3877f2SHaiyang Zhang unsigned long flag; 8427c3877f2SHaiyang Zhang struct multi_send_data *msdp; 8437c3877f2SHaiyang Zhang struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL; 844aa0a34beSHaiyang Zhang bool try_batch; 8457c3877f2SHaiyang Zhang 8467c3877f2SHaiyang Zhang net_device = get_outbound_net_device(device); 8477c3877f2SHaiyang Zhang if (!net_device) 8487c3877f2SHaiyang Zhang return -ENODEV; 8497c3877f2SHaiyang Zhang 8507c3877f2SHaiyang Zhang out_channel = net_device->chn_table[q_idx]; 8517c3877f2SHaiyang Zhang if (!out_channel) { 8527c3877f2SHaiyang Zhang out_channel = device->channel; 8537c3877f2SHaiyang Zhang q_idx = 0; 8547c3877f2SHaiyang Zhang packet->q_idx = 0; 8557c3877f2SHaiyang Zhang } 8567c3877f2SHaiyang Zhang packet->channel = out_channel; 8577c3877f2SHaiyang Zhang packet->send_buf_index = NETVSC_INVALID_INDEX; 858aa0a34beSHaiyang Zhang packet->cp_partial = false; 8597c3877f2SHaiyang Zhang 8607c3877f2SHaiyang Zhang msdp = &net_device->msd[q_idx]; 8617c3877f2SHaiyang Zhang 8627c3877f2SHaiyang Zhang /* batch packets in send buffer if possible */ 8637c3877f2SHaiyang Zhang spin_lock_irqsave(&msdp->lock, flag); 8647c3877f2SHaiyang Zhang if (msdp->pkt) 8657c3877f2SHaiyang Zhang msd_len = msdp->pkt->total_data_buflen; 8667c3877f2SHaiyang Zhang 867aa0a34beSHaiyang Zhang try_batch = packet->is_data_pkt && msd_len > 0 && msdp->count < 868aa0a34beSHaiyang Zhang net_device->max_pkt; 869aa0a34beSHaiyang Zhang 870aa0a34beSHaiyang Zhang if (try_batch && msd_len + pktlen + net_device->pkt_align < 8717c3877f2SHaiyang Zhang net_device->send_section_size) { 8727c3877f2SHaiyang Zhang section_index = msdp->pkt->send_buf_index; 8737c3877f2SHaiyang Zhang 874aa0a34beSHaiyang Zhang } else if (try_batch && msd_len + packet->rmsg_size < 875aa0a34beSHaiyang Zhang net_device->send_section_size) { 876aa0a34beSHaiyang Zhang section_index = msdp->pkt->send_buf_index; 877aa0a34beSHaiyang Zhang packet->cp_partial = true; 878aa0a34beSHaiyang Zhang 8797c3877f2SHaiyang Zhang } else if (packet->is_data_pkt && pktlen + net_device->pkt_align < 8807c3877f2SHaiyang Zhang net_device->send_section_size) { 8817c3877f2SHaiyang Zhang section_index = netvsc_get_next_send_section(net_device); 8827c3877f2SHaiyang Zhang if (section_index != NETVSC_INVALID_INDEX) { 8837c3877f2SHaiyang Zhang msd_send = msdp->pkt; 8847c3877f2SHaiyang Zhang msdp->pkt = NULL; 8857c3877f2SHaiyang Zhang msdp->count = 0; 8867c3877f2SHaiyang Zhang msd_len = 0; 8877c3877f2SHaiyang Zhang } 8887c3877f2SHaiyang Zhang } 8897c3877f2SHaiyang Zhang 8907c3877f2SHaiyang Zhang if (section_index != NETVSC_INVALID_INDEX) { 8917c3877f2SHaiyang Zhang netvsc_copy_to_send_buf(net_device, 8927c3877f2SHaiyang Zhang section_index, msd_len, 8937c3877f2SHaiyang Zhang packet); 894b08cc791SKY Srinivasan 895aa0a34beSHaiyang Zhang packet->send_buf_index = section_index; 896aa0a34beSHaiyang Zhang 897aa0a34beSHaiyang Zhang if (packet->cp_partial) { 898aa0a34beSHaiyang Zhang packet->page_buf_cnt -= packet->rmsg_pgcnt; 899aa0a34beSHaiyang Zhang packet->total_data_buflen = msd_len + packet->rmsg_size; 900aa0a34beSHaiyang Zhang } else { 901aa0a34beSHaiyang Zhang packet->page_buf_cnt = 0; 902aa0a34beSHaiyang Zhang packet->total_data_buflen += msd_len; 903aa0a34beSHaiyang Zhang } 9047c3877f2SHaiyang Zhang 905ee90b812SHaiyang Zhang if (msdp->pkt) 906ee90b812SHaiyang Zhang netvsc_xmit_completion(msdp->pkt); 907ee90b812SHaiyang Zhang 908aa0a34beSHaiyang Zhang if (packet->xmit_more && !packet->cp_partial) { 9097c3877f2SHaiyang Zhang msdp->pkt = packet; 9107c3877f2SHaiyang Zhang msdp->count++; 9117c3877f2SHaiyang Zhang } else { 9127c3877f2SHaiyang Zhang cur_send = packet; 9137c3877f2SHaiyang Zhang msdp->pkt = NULL; 9147c3877f2SHaiyang Zhang msdp->count = 0; 9157c3877f2SHaiyang Zhang } 9167c3877f2SHaiyang Zhang } else { 9177c3877f2SHaiyang Zhang msd_send = msdp->pkt; 9187c3877f2SHaiyang Zhang msdp->pkt = NULL; 9197c3877f2SHaiyang Zhang msdp->count = 0; 9207c3877f2SHaiyang Zhang cur_send = packet; 9217c3877f2SHaiyang Zhang } 9227c3877f2SHaiyang Zhang 9237c3877f2SHaiyang Zhang spin_unlock_irqrestore(&msdp->lock, flag); 9247c3877f2SHaiyang Zhang 9257c3877f2SHaiyang Zhang if (msd_send) { 9267c3877f2SHaiyang Zhang m_ret = netvsc_send_pkt(msd_send, net_device); 9277c3877f2SHaiyang Zhang 9287c3877f2SHaiyang Zhang if (m_ret != 0) { 9297c3877f2SHaiyang Zhang netvsc_free_send_slot(net_device, 9307c3877f2SHaiyang Zhang msd_send->send_buf_index); 931ee90b812SHaiyang Zhang netvsc_xmit_completion(msd_send); 9327c3877f2SHaiyang Zhang } 9337c3877f2SHaiyang Zhang } 9347c3877f2SHaiyang Zhang 9357c3877f2SHaiyang Zhang if (cur_send) 9367c3877f2SHaiyang Zhang ret = netvsc_send_pkt(cur_send, net_device); 9377c3877f2SHaiyang Zhang 938d953ca4dSHaiyang Zhang if (ret != 0) { 939d953ca4dSHaiyang Zhang if (section_index != NETVSC_INVALID_INDEX) 940d953ca4dSHaiyang Zhang netvsc_free_send_slot(net_device, section_index); 941d953ca4dSHaiyang Zhang } else if (skb) { 942d953ca4dSHaiyang Zhang dev_kfree_skb_any(skb); 943d953ca4dSHaiyang Zhang } 944d953ca4dSHaiyang Zhang 94595fa0405SHaiyang Zhang return ret; 94695fa0405SHaiyang Zhang } 94795fa0405SHaiyang Zhang 94895fa0405SHaiyang Zhang static void netvsc_send_recv_completion(struct hv_device *device, 9495b54dac8SHaiyang Zhang struct vmbus_channel *channel, 95097c1723aSKY Srinivasan struct netvsc_device *net_device, 95163f6921dSHaiyang Zhang u64 transaction_id, u32 status) 95295fa0405SHaiyang Zhang { 95395fa0405SHaiyang Zhang struct nvsp_message recvcompMessage; 95495fa0405SHaiyang Zhang int retries = 0; 95595fa0405SHaiyang Zhang int ret; 95695fa0405SHaiyang Zhang struct net_device *ndev; 95795fa0405SHaiyang Zhang 95895fa0405SHaiyang Zhang ndev = net_device->ndev; 95995fa0405SHaiyang Zhang 96095fa0405SHaiyang Zhang recvcompMessage.hdr.msg_type = 96195fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; 96295fa0405SHaiyang Zhang 96363f6921dSHaiyang Zhang recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status; 96495fa0405SHaiyang Zhang 96595fa0405SHaiyang Zhang retry_send_cmplt: 96695fa0405SHaiyang Zhang /* Send the completion */ 9675b54dac8SHaiyang Zhang ret = vmbus_sendpacket(channel, &recvcompMessage, 96895fa0405SHaiyang Zhang sizeof(struct nvsp_message), transaction_id, 96995fa0405SHaiyang Zhang VM_PKT_COMP, 0); 97095fa0405SHaiyang Zhang if (ret == 0) { 97195fa0405SHaiyang Zhang /* success */ 97295fa0405SHaiyang Zhang /* no-op */ 97395fa0405SHaiyang Zhang } else if (ret == -EAGAIN) { 97495fa0405SHaiyang Zhang /* no more room...wait a bit and attempt to retry 3 times */ 97595fa0405SHaiyang Zhang retries++; 97695fa0405SHaiyang Zhang netdev_err(ndev, "unable to send receive completion pkt" 97795fa0405SHaiyang Zhang " (tid %llx)...retrying %d\n", transaction_id, retries); 97895fa0405SHaiyang Zhang 97995fa0405SHaiyang Zhang if (retries < 4) { 98095fa0405SHaiyang Zhang udelay(100); 98195fa0405SHaiyang Zhang goto retry_send_cmplt; 98295fa0405SHaiyang Zhang } else { 98395fa0405SHaiyang Zhang netdev_err(ndev, "unable to send receive " 98495fa0405SHaiyang Zhang "completion pkt (tid %llx)...give up retrying\n", 98595fa0405SHaiyang Zhang transaction_id); 98695fa0405SHaiyang Zhang } 98795fa0405SHaiyang Zhang } else { 98895fa0405SHaiyang Zhang netdev_err(ndev, "unable to send receive " 98995fa0405SHaiyang Zhang "completion pkt - %llx\n", transaction_id); 99095fa0405SHaiyang Zhang } 99195fa0405SHaiyang Zhang } 99295fa0405SHaiyang Zhang 99397c1723aSKY Srinivasan static void netvsc_receive(struct netvsc_device *net_device, 9945b54dac8SHaiyang Zhang struct vmbus_channel *channel, 99597c1723aSKY Srinivasan struct hv_device *device, 99695fa0405SHaiyang Zhang struct vmpacket_descriptor *packet) 99795fa0405SHaiyang Zhang { 99895fa0405SHaiyang Zhang struct vmtransfer_page_packet_header *vmxferpage_packet; 99995fa0405SHaiyang Zhang struct nvsp_message *nvsp_packet; 10004baab261SHaiyang Zhang struct hv_netvsc_packet nv_pkt; 10014baab261SHaiyang Zhang struct hv_netvsc_packet *netvsc_packet = &nv_pkt; 10024baab261SHaiyang Zhang u32 status = NVSP_STAT_SUCCESS; 100345326342SHaiyang Zhang int i; 100445326342SHaiyang Zhang int count = 0; 100595fa0405SHaiyang Zhang struct net_device *ndev; 100695fa0405SHaiyang Zhang 100795fa0405SHaiyang Zhang ndev = net_device->ndev; 100895fa0405SHaiyang Zhang 100995fa0405SHaiyang Zhang /* 101095fa0405SHaiyang Zhang * All inbound packets other than send completion should be xfer page 101195fa0405SHaiyang Zhang * packet 101295fa0405SHaiyang Zhang */ 101395fa0405SHaiyang Zhang if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { 101495fa0405SHaiyang Zhang netdev_err(ndev, "Unknown packet type received - %d\n", 101595fa0405SHaiyang Zhang packet->type); 101695fa0405SHaiyang Zhang return; 101795fa0405SHaiyang Zhang } 101895fa0405SHaiyang Zhang 101995fa0405SHaiyang Zhang nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 102095fa0405SHaiyang Zhang (packet->offset8 << 3)); 102195fa0405SHaiyang Zhang 102295fa0405SHaiyang Zhang /* Make sure this is a valid nvsp packet */ 102395fa0405SHaiyang Zhang if (nvsp_packet->hdr.msg_type != 102495fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RNDIS_PKT) { 102595fa0405SHaiyang Zhang netdev_err(ndev, "Unknown nvsp packet type received-" 102695fa0405SHaiyang Zhang " %d\n", nvsp_packet->hdr.msg_type); 102795fa0405SHaiyang Zhang return; 102895fa0405SHaiyang Zhang } 102995fa0405SHaiyang Zhang 103095fa0405SHaiyang Zhang vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; 103195fa0405SHaiyang Zhang 103295fa0405SHaiyang Zhang if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { 103395fa0405SHaiyang Zhang netdev_err(ndev, "Invalid xfer page set id - " 103495fa0405SHaiyang Zhang "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID, 103595fa0405SHaiyang Zhang vmxferpage_packet->xfer_pageset_id); 103695fa0405SHaiyang Zhang return; 103795fa0405SHaiyang Zhang } 103895fa0405SHaiyang Zhang 10394baab261SHaiyang Zhang count = vmxferpage_packet->range_cnt; 10404baab261SHaiyang Zhang netvsc_packet->channel = channel; 104195fa0405SHaiyang Zhang 104295fa0405SHaiyang Zhang /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ 10434baab261SHaiyang Zhang for (i = 0; i < count; i++) { 104495fa0405SHaiyang Zhang /* Initialize the netvsc packet */ 104563f6921dSHaiyang Zhang netvsc_packet->status = NVSP_STAT_SUCCESS; 104645326342SHaiyang Zhang netvsc_packet->data = (void *)((unsigned long)net_device-> 104745326342SHaiyang Zhang recv_buf + vmxferpage_packet->ranges[i].byte_offset); 104895fa0405SHaiyang Zhang netvsc_packet->total_data_buflen = 104995fa0405SHaiyang Zhang vmxferpage_packet->ranges[i].byte_count; 105095fa0405SHaiyang Zhang 105195fa0405SHaiyang Zhang /* Pass it to the upper layer */ 105295fa0405SHaiyang Zhang rndis_filter_receive(device, netvsc_packet); 105395fa0405SHaiyang Zhang 10544baab261SHaiyang Zhang if (netvsc_packet->status != NVSP_STAT_SUCCESS) 10554baab261SHaiyang Zhang status = NVSP_STAT_FAIL; 105695fa0405SHaiyang Zhang } 105795fa0405SHaiyang Zhang 10584baab261SHaiyang Zhang netvsc_send_recv_completion(device, channel, net_device, 10594baab261SHaiyang Zhang vmxferpage_packet->d.trans_id, status); 106095fa0405SHaiyang Zhang } 106195fa0405SHaiyang Zhang 10625b54dac8SHaiyang Zhang 10635b54dac8SHaiyang Zhang static void netvsc_send_table(struct hv_device *hdev, 10645b54dac8SHaiyang Zhang struct vmpacket_descriptor *vmpkt) 10655b54dac8SHaiyang Zhang { 10665b54dac8SHaiyang Zhang struct netvsc_device *nvscdev; 10675b54dac8SHaiyang Zhang struct net_device *ndev; 10685b54dac8SHaiyang Zhang struct nvsp_message *nvmsg; 10695b54dac8SHaiyang Zhang int i; 10705b54dac8SHaiyang Zhang u32 count, *tab; 10715b54dac8SHaiyang Zhang 10725b54dac8SHaiyang Zhang nvscdev = get_outbound_net_device(hdev); 10735b54dac8SHaiyang Zhang if (!nvscdev) 10745b54dac8SHaiyang Zhang return; 10755b54dac8SHaiyang Zhang ndev = nvscdev->ndev; 10765b54dac8SHaiyang Zhang 10775b54dac8SHaiyang Zhang nvmsg = (struct nvsp_message *)((unsigned long)vmpkt + 10785b54dac8SHaiyang Zhang (vmpkt->offset8 << 3)); 10795b54dac8SHaiyang Zhang 10805b54dac8SHaiyang Zhang if (nvmsg->hdr.msg_type != NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE) 10815b54dac8SHaiyang Zhang return; 10825b54dac8SHaiyang Zhang 10835b54dac8SHaiyang Zhang count = nvmsg->msg.v5_msg.send_table.count; 10845b54dac8SHaiyang Zhang if (count != VRSS_SEND_TAB_SIZE) { 10855b54dac8SHaiyang Zhang netdev_err(ndev, "Received wrong send-table size:%u\n", count); 10865b54dac8SHaiyang Zhang return; 10875b54dac8SHaiyang Zhang } 10885b54dac8SHaiyang Zhang 10895b54dac8SHaiyang Zhang tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table + 10905b54dac8SHaiyang Zhang nvmsg->msg.v5_msg.send_table.offset); 10915b54dac8SHaiyang Zhang 10925b54dac8SHaiyang Zhang for (i = 0; i < count; i++) 10935b54dac8SHaiyang Zhang nvscdev->send_table[i] = tab[i]; 10945b54dac8SHaiyang Zhang } 10955b54dac8SHaiyang Zhang 10965b54dac8SHaiyang Zhang void netvsc_channel_cb(void *context) 109795fa0405SHaiyang Zhang { 109895fa0405SHaiyang Zhang int ret; 10995b54dac8SHaiyang Zhang struct vmbus_channel *channel = (struct vmbus_channel *)context; 11005b54dac8SHaiyang Zhang struct hv_device *device; 110195fa0405SHaiyang Zhang struct netvsc_device *net_device; 110295fa0405SHaiyang Zhang u32 bytes_recvd; 110395fa0405SHaiyang Zhang u64 request_id; 110495fa0405SHaiyang Zhang struct vmpacket_descriptor *desc; 110595fa0405SHaiyang Zhang unsigned char *buffer; 110695fa0405SHaiyang Zhang int bufferlen = NETVSC_PACKET_SIZE; 110795fa0405SHaiyang Zhang struct net_device *ndev; 110895fa0405SHaiyang Zhang 11095b54dac8SHaiyang Zhang if (channel->primary_channel != NULL) 11105b54dac8SHaiyang Zhang device = channel->primary_channel->device_obj; 11115b54dac8SHaiyang Zhang else 11125b54dac8SHaiyang Zhang device = channel->device_obj; 11135b54dac8SHaiyang Zhang 111495fa0405SHaiyang Zhang net_device = get_inbound_net_device(device); 111595fa0405SHaiyang Zhang if (!net_device) 1116ee0c4c39SKY Srinivasan return; 111795fa0405SHaiyang Zhang ndev = net_device->ndev; 11185b54dac8SHaiyang Zhang buffer = get_per_channel_state(channel); 111995fa0405SHaiyang Zhang 112095fa0405SHaiyang Zhang do { 11215b54dac8SHaiyang Zhang ret = vmbus_recvpacket_raw(channel, buffer, bufferlen, 112295fa0405SHaiyang Zhang &bytes_recvd, &request_id); 112395fa0405SHaiyang Zhang if (ret == 0) { 112495fa0405SHaiyang Zhang if (bytes_recvd > 0) { 112595fa0405SHaiyang Zhang desc = (struct vmpacket_descriptor *)buffer; 112695fa0405SHaiyang Zhang switch (desc->type) { 112795fa0405SHaiyang Zhang case VM_PKT_COMP: 112897c1723aSKY Srinivasan netvsc_send_completion(net_device, 112997c1723aSKY Srinivasan device, desc); 113095fa0405SHaiyang Zhang break; 113195fa0405SHaiyang Zhang 113295fa0405SHaiyang Zhang case VM_PKT_DATA_USING_XFER_PAGES: 11335b54dac8SHaiyang Zhang netvsc_receive(net_device, channel, 113497c1723aSKY Srinivasan device, desc); 113595fa0405SHaiyang Zhang break; 113695fa0405SHaiyang Zhang 11375b54dac8SHaiyang Zhang case VM_PKT_DATA_INBAND: 11385b54dac8SHaiyang Zhang netvsc_send_table(device, desc); 11395b54dac8SHaiyang Zhang break; 11405b54dac8SHaiyang Zhang 114195fa0405SHaiyang Zhang default: 114295fa0405SHaiyang Zhang netdev_err(ndev, 114395fa0405SHaiyang Zhang "unhandled packet type %d, " 114495fa0405SHaiyang Zhang "tid %llx len %d\n", 114595fa0405SHaiyang Zhang desc->type, request_id, 114695fa0405SHaiyang Zhang bytes_recvd); 114795fa0405SHaiyang Zhang break; 114895fa0405SHaiyang Zhang } 114995fa0405SHaiyang Zhang 115095fa0405SHaiyang Zhang } else { 1151ee0c4c39SKY Srinivasan /* 1152ee0c4c39SKY Srinivasan * We are done for this pass. 1153ee0c4c39SKY Srinivasan */ 115495fa0405SHaiyang Zhang break; 115595fa0405SHaiyang Zhang } 1156ee0c4c39SKY Srinivasan 115795fa0405SHaiyang Zhang } else if (ret == -ENOBUFS) { 1158ee0c4c39SKY Srinivasan if (bufferlen > NETVSC_PACKET_SIZE) 1159ee0c4c39SKY Srinivasan kfree(buffer); 116095fa0405SHaiyang Zhang /* Handle large packet */ 116195fa0405SHaiyang Zhang buffer = kmalloc(bytes_recvd, GFP_ATOMIC); 116295fa0405SHaiyang Zhang if (buffer == NULL) { 116395fa0405SHaiyang Zhang /* Try again next time around */ 116495fa0405SHaiyang Zhang netdev_err(ndev, 116595fa0405SHaiyang Zhang "unable to allocate buffer of size " 116695fa0405SHaiyang Zhang "(%d)!!\n", bytes_recvd); 116795fa0405SHaiyang Zhang break; 116895fa0405SHaiyang Zhang } 116995fa0405SHaiyang Zhang 117095fa0405SHaiyang Zhang bufferlen = bytes_recvd; 117195fa0405SHaiyang Zhang } 117295fa0405SHaiyang Zhang } while (1); 117395fa0405SHaiyang Zhang 1174ee0c4c39SKY Srinivasan if (bufferlen > NETVSC_PACKET_SIZE) 117595fa0405SHaiyang Zhang kfree(buffer); 117695fa0405SHaiyang Zhang return; 117795fa0405SHaiyang Zhang } 117895fa0405SHaiyang Zhang 117995fa0405SHaiyang Zhang /* 118095fa0405SHaiyang Zhang * netvsc_device_add - Callback when the device belonging to this 118195fa0405SHaiyang Zhang * driver is added 118295fa0405SHaiyang Zhang */ 118395fa0405SHaiyang Zhang int netvsc_device_add(struct hv_device *device, void *additional_info) 118495fa0405SHaiyang Zhang { 118595fa0405SHaiyang Zhang int ret = 0; 118695fa0405SHaiyang Zhang int ring_size = 118795fa0405SHaiyang Zhang ((struct netvsc_device_info *)additional_info)->ring_size; 118895fa0405SHaiyang Zhang struct netvsc_device *net_device; 118995fa0405SHaiyang Zhang struct net_device *ndev; 119095fa0405SHaiyang Zhang 119195fa0405SHaiyang Zhang net_device = alloc_net_device(device); 1192b1c84927SDan Carpenter if (!net_device) 1193b1c84927SDan Carpenter return -ENOMEM; 119495fa0405SHaiyang Zhang 11955b54dac8SHaiyang Zhang net_device->ring_size = ring_size; 11965b54dac8SHaiyang Zhang 119795fa0405SHaiyang Zhang /* 119895fa0405SHaiyang Zhang * Coming into this function, struct net_device * is 119995fa0405SHaiyang Zhang * registered as the driver private data. 120095fa0405SHaiyang Zhang * In alloc_net_device(), we register struct netvsc_device * 120195fa0405SHaiyang Zhang * as the driver private data and stash away struct net_device * 120295fa0405SHaiyang Zhang * in struct netvsc_device *. 120395fa0405SHaiyang Zhang */ 120495fa0405SHaiyang Zhang ndev = net_device->ndev; 120595fa0405SHaiyang Zhang 12063f300ff4SSimon Xiao /* Add netvsc_device context to netvsc_device */ 12073f300ff4SSimon Xiao net_device->nd_ctx = netdev_priv(ndev); 12083f300ff4SSimon Xiao 120995fa0405SHaiyang Zhang /* Initialize the NetVSC channel extension */ 121095fa0405SHaiyang Zhang init_completion(&net_device->channel_init_wait); 121195fa0405SHaiyang Zhang 12125b54dac8SHaiyang Zhang set_per_channel_state(device->channel, net_device->cb_buffer); 12135b54dac8SHaiyang Zhang 121495fa0405SHaiyang Zhang /* Open the channel */ 121595fa0405SHaiyang Zhang ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, 121695fa0405SHaiyang Zhang ring_size * PAGE_SIZE, NULL, 0, 12175b54dac8SHaiyang Zhang netvsc_channel_cb, device->channel); 121895fa0405SHaiyang Zhang 121995fa0405SHaiyang Zhang if (ret != 0) { 122095fa0405SHaiyang Zhang netdev_err(ndev, "unable to open channel: %d\n", ret); 122195fa0405SHaiyang Zhang goto cleanup; 122295fa0405SHaiyang Zhang } 122395fa0405SHaiyang Zhang 122495fa0405SHaiyang Zhang /* Channel is opened */ 122595fa0405SHaiyang Zhang pr_info("hv_netvsc channel opened successfully\n"); 122695fa0405SHaiyang Zhang 12275b54dac8SHaiyang Zhang net_device->chn_table[0] = device->channel; 12285b54dac8SHaiyang Zhang 122995fa0405SHaiyang Zhang /* Connect with the NetVsp */ 123095fa0405SHaiyang Zhang ret = netvsc_connect_vsp(device); 123195fa0405SHaiyang Zhang if (ret != 0) { 123295fa0405SHaiyang Zhang netdev_err(ndev, 123395fa0405SHaiyang Zhang "unable to connect to NetVSP - %d\n", ret); 123495fa0405SHaiyang Zhang goto close; 123595fa0405SHaiyang Zhang } 123695fa0405SHaiyang Zhang 123795fa0405SHaiyang Zhang return ret; 123895fa0405SHaiyang Zhang 123995fa0405SHaiyang Zhang close: 124095fa0405SHaiyang Zhang /* Now, we can close the channel safely */ 124195fa0405SHaiyang Zhang vmbus_close(device->channel); 124295fa0405SHaiyang Zhang 124395fa0405SHaiyang Zhang cleanup: 1244f90251c8SHaiyang Zhang free_netvsc_device(net_device); 124595fa0405SHaiyang Zhang 124695fa0405SHaiyang Zhang return ret; 124795fa0405SHaiyang Zhang } 1248