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> 31d6472302SStephen Rothwell #include <linux/vmalloc.h> 32c25aaf81SKY Srinivasan #include <asm/sync_bitops.h> 3395fa0405SHaiyang Zhang 3495fa0405SHaiyang Zhang #include "hyperv_net.h" 3595fa0405SHaiyang Zhang 3684bf9cefSKY Srinivasan /* 3784bf9cefSKY Srinivasan * Switch the data path from the synthetic interface to the VF 3884bf9cefSKY Srinivasan * interface. 3984bf9cefSKY Srinivasan */ 400a1275caSVitaly Kuznetsov void netvsc_switch_datapath(struct net_device *ndev, bool vf) 4184bf9cefSKY Srinivasan { 423d541ac5SVitaly Kuznetsov struct net_device_context *net_device_ctx = netdev_priv(ndev); 433d541ac5SVitaly Kuznetsov struct hv_device *dev = net_device_ctx->device_ctx; 440a1275caSVitaly Kuznetsov struct netvsc_device *nv_dev = net_device_ctx->nvdev; 450a1275caSVitaly Kuznetsov struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt; 4684bf9cefSKY Srinivasan 4784bf9cefSKY Srinivasan memset(init_pkt, 0, sizeof(struct nvsp_message)); 4884bf9cefSKY Srinivasan init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH; 4984bf9cefSKY Srinivasan if (vf) 5084bf9cefSKY Srinivasan init_pkt->msg.v4_msg.active_dp.active_datapath = 5184bf9cefSKY Srinivasan NVSP_DATAPATH_VF; 5284bf9cefSKY Srinivasan else 5384bf9cefSKY Srinivasan init_pkt->msg.v4_msg.active_dp.active_datapath = 5484bf9cefSKY Srinivasan NVSP_DATAPATH_SYNTHETIC; 5584bf9cefSKY Srinivasan 5684bf9cefSKY Srinivasan vmbus_sendpacket(dev->channel, init_pkt, 5784bf9cefSKY Srinivasan sizeof(struct nvsp_message), 5884bf9cefSKY Srinivasan (unsigned long)init_pkt, 5984bf9cefSKY Srinivasan VM_PKT_DATA_INBAND, 0); 6084bf9cefSKY Srinivasan } 6184bf9cefSKY Srinivasan 6295fa0405SHaiyang Zhang 6388098834SVitaly Kuznetsov static struct netvsc_device *alloc_net_device(void) 6495fa0405SHaiyang Zhang { 6595fa0405SHaiyang Zhang struct netvsc_device *net_device; 6695fa0405SHaiyang Zhang 6795fa0405SHaiyang Zhang net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); 6895fa0405SHaiyang Zhang if (!net_device) 6995fa0405SHaiyang Zhang return NULL; 7095fa0405SHaiyang Zhang 71f90251c8SHaiyang Zhang net_device->cb_buffer = kzalloc(NETVSC_PACKET_SIZE, GFP_KERNEL); 72f90251c8SHaiyang Zhang if (!net_device->cb_buffer) { 73f90251c8SHaiyang Zhang kfree(net_device); 74f90251c8SHaiyang Zhang return NULL; 75f90251c8SHaiyang Zhang } 76f90251c8SHaiyang Zhang 77c0b558e5SHaiyang Zhang net_device->mrc[0].buf = vzalloc(NETVSC_RECVSLOT_MAX * 78c0b558e5SHaiyang Zhang sizeof(struct recv_comp_data)); 79c0b558e5SHaiyang Zhang 80dc5cd894SHaiyang Zhang init_waitqueue_head(&net_device->wait_drain); 8195fa0405SHaiyang Zhang net_device->destroy = false; 8284bf9cefSKY Srinivasan atomic_set(&net_device->open_cnt, 0); 837c3877f2SHaiyang Zhang net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT; 847c3877f2SHaiyang Zhang net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT; 857c3877f2SHaiyang Zhang 8695fa0405SHaiyang Zhang return net_device; 8795fa0405SHaiyang Zhang } 8895fa0405SHaiyang Zhang 89f90251c8SHaiyang Zhang static void free_netvsc_device(struct netvsc_device *nvdev) 90f90251c8SHaiyang Zhang { 91c0b558e5SHaiyang Zhang int i; 92c0b558e5SHaiyang Zhang 93c0b558e5SHaiyang Zhang for (i = 0; i < VRSS_CHANNEL_MAX; i++) 94c0b558e5SHaiyang Zhang vfree(nvdev->mrc[i].buf); 95c0b558e5SHaiyang Zhang 96f90251c8SHaiyang Zhang kfree(nvdev->cb_buffer); 97f90251c8SHaiyang Zhang kfree(nvdev); 98f90251c8SHaiyang Zhang } 99f90251c8SHaiyang Zhang 10095fa0405SHaiyang Zhang static struct netvsc_device *get_outbound_net_device(struct hv_device *device) 10195fa0405SHaiyang Zhang { 1022625466dSVitaly Kuznetsov struct netvsc_device *net_device = hv_device_to_netvsc_device(device); 10395fa0405SHaiyang Zhang 10495fa0405SHaiyang Zhang if (net_device && net_device->destroy) 10595fa0405SHaiyang Zhang net_device = NULL; 10695fa0405SHaiyang Zhang 10795fa0405SHaiyang Zhang return net_device; 10895fa0405SHaiyang Zhang } 10995fa0405SHaiyang Zhang 11095fa0405SHaiyang Zhang static struct netvsc_device *get_inbound_net_device(struct hv_device *device) 11195fa0405SHaiyang Zhang { 1122625466dSVitaly Kuznetsov struct netvsc_device *net_device = hv_device_to_netvsc_device(device); 11395fa0405SHaiyang Zhang 11495fa0405SHaiyang Zhang if (!net_device) 11595fa0405SHaiyang Zhang goto get_in_err; 11695fa0405SHaiyang Zhang 11795fa0405SHaiyang Zhang if (net_device->destroy && 118c0b558e5SHaiyang Zhang atomic_read(&net_device->num_outstanding_sends) == 0 && 119c0b558e5SHaiyang Zhang atomic_read(&net_device->num_outstanding_recvs) == 0) 12095fa0405SHaiyang Zhang net_device = NULL; 12195fa0405SHaiyang Zhang 12295fa0405SHaiyang Zhang get_in_err: 12395fa0405SHaiyang Zhang return net_device; 12495fa0405SHaiyang Zhang } 12595fa0405SHaiyang Zhang 12695fa0405SHaiyang Zhang 1273d541ac5SVitaly Kuznetsov static int netvsc_destroy_buf(struct hv_device *device) 12895fa0405SHaiyang Zhang { 12995fa0405SHaiyang Zhang struct nvsp_message *revoke_packet; 13095fa0405SHaiyang Zhang int ret = 0; 1313d541ac5SVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 1322625466dSVitaly Kuznetsov struct netvsc_device *net_device = net_device_to_netvsc_device(ndev); 13395fa0405SHaiyang Zhang 13495fa0405SHaiyang Zhang /* 13595fa0405SHaiyang Zhang * If we got a section count, it means we received a 13695fa0405SHaiyang Zhang * SendReceiveBufferComplete msg (ie sent 13795fa0405SHaiyang Zhang * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need 13895fa0405SHaiyang Zhang * to send a revoke msg here 13995fa0405SHaiyang Zhang */ 14095fa0405SHaiyang Zhang if (net_device->recv_section_cnt) { 14195fa0405SHaiyang Zhang /* Send the revoke receive buffer */ 14295fa0405SHaiyang Zhang revoke_packet = &net_device->revoke_packet; 14395fa0405SHaiyang Zhang memset(revoke_packet, 0, sizeof(struct nvsp_message)); 14495fa0405SHaiyang Zhang 14595fa0405SHaiyang Zhang revoke_packet->hdr.msg_type = 14695fa0405SHaiyang Zhang NVSP_MSG1_TYPE_REVOKE_RECV_BUF; 14795fa0405SHaiyang Zhang revoke_packet->msg.v1_msg. 14895fa0405SHaiyang Zhang revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 14995fa0405SHaiyang Zhang 1503d541ac5SVitaly Kuznetsov ret = vmbus_sendpacket(device->channel, 15195fa0405SHaiyang Zhang revoke_packet, 15295fa0405SHaiyang Zhang sizeof(struct nvsp_message), 15395fa0405SHaiyang Zhang (unsigned long)revoke_packet, 15495fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 0); 15595fa0405SHaiyang Zhang /* 15695fa0405SHaiyang Zhang * If we failed here, we might as well return and 15795fa0405SHaiyang Zhang * have a leak rather than continue and a bugchk 15895fa0405SHaiyang Zhang */ 15995fa0405SHaiyang Zhang if (ret != 0) { 16095fa0405SHaiyang Zhang netdev_err(ndev, "unable to send " 16195fa0405SHaiyang Zhang "revoke receive buffer to netvsp\n"); 16295fa0405SHaiyang Zhang return ret; 16395fa0405SHaiyang Zhang } 16495fa0405SHaiyang Zhang } 16595fa0405SHaiyang Zhang 16695fa0405SHaiyang Zhang /* Teardown the gpadl on the vsp end */ 16795fa0405SHaiyang Zhang if (net_device->recv_buf_gpadl_handle) { 1683d541ac5SVitaly Kuznetsov ret = vmbus_teardown_gpadl(device->channel, 16995fa0405SHaiyang Zhang net_device->recv_buf_gpadl_handle); 17095fa0405SHaiyang Zhang 17195fa0405SHaiyang Zhang /* If we failed here, we might as well return and have a leak 17295fa0405SHaiyang Zhang * rather than continue and a bugchk 17395fa0405SHaiyang Zhang */ 17495fa0405SHaiyang Zhang if (ret != 0) { 17595fa0405SHaiyang Zhang netdev_err(ndev, 17695fa0405SHaiyang Zhang "unable to teardown receive buffer's gpadl\n"); 17795fa0405SHaiyang Zhang return ret; 17895fa0405SHaiyang Zhang } 17995fa0405SHaiyang Zhang net_device->recv_buf_gpadl_handle = 0; 18095fa0405SHaiyang Zhang } 18195fa0405SHaiyang Zhang 18295fa0405SHaiyang Zhang if (net_device->recv_buf) { 18395fa0405SHaiyang Zhang /* Free up the receive buffer */ 184b679ef73SHaiyang Zhang vfree(net_device->recv_buf); 18595fa0405SHaiyang Zhang net_device->recv_buf = NULL; 18695fa0405SHaiyang Zhang } 18795fa0405SHaiyang Zhang 18895fa0405SHaiyang Zhang if (net_device->recv_section) { 18995fa0405SHaiyang Zhang net_device->recv_section_cnt = 0; 19095fa0405SHaiyang Zhang kfree(net_device->recv_section); 19195fa0405SHaiyang Zhang net_device->recv_section = NULL; 19295fa0405SHaiyang Zhang } 19395fa0405SHaiyang Zhang 194c25aaf81SKY Srinivasan /* Deal with the send buffer we may have setup. 195c25aaf81SKY Srinivasan * If we got a send section size, it means we received a 196c51ed182SHaiyang Zhang * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent 197c51ed182SHaiyang Zhang * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need 198c25aaf81SKY Srinivasan * to send a revoke msg here 199c25aaf81SKY Srinivasan */ 200c25aaf81SKY Srinivasan if (net_device->send_section_size) { 201c25aaf81SKY Srinivasan /* Send the revoke receive buffer */ 202c25aaf81SKY Srinivasan revoke_packet = &net_device->revoke_packet; 203c25aaf81SKY Srinivasan memset(revoke_packet, 0, sizeof(struct nvsp_message)); 204c25aaf81SKY Srinivasan 205c25aaf81SKY Srinivasan revoke_packet->hdr.msg_type = 206c25aaf81SKY Srinivasan NVSP_MSG1_TYPE_REVOKE_SEND_BUF; 207c51ed182SHaiyang Zhang revoke_packet->msg.v1_msg.revoke_send_buf.id = 208c51ed182SHaiyang Zhang NETVSC_SEND_BUFFER_ID; 209c25aaf81SKY Srinivasan 2103d541ac5SVitaly Kuznetsov ret = vmbus_sendpacket(device->channel, 211c25aaf81SKY Srinivasan revoke_packet, 212c25aaf81SKY Srinivasan sizeof(struct nvsp_message), 213c25aaf81SKY Srinivasan (unsigned long)revoke_packet, 214c25aaf81SKY Srinivasan VM_PKT_DATA_INBAND, 0); 215c25aaf81SKY Srinivasan /* If we failed here, we might as well return and 216c25aaf81SKY Srinivasan * have a leak rather than continue and a bugchk 217c25aaf81SKY Srinivasan */ 218c25aaf81SKY Srinivasan if (ret != 0) { 219c25aaf81SKY Srinivasan netdev_err(ndev, "unable to send " 220c25aaf81SKY Srinivasan "revoke send buffer to netvsp\n"); 221c25aaf81SKY Srinivasan return ret; 222c25aaf81SKY Srinivasan } 223c25aaf81SKY Srinivasan } 224c25aaf81SKY Srinivasan /* Teardown the gpadl on the vsp end */ 225c25aaf81SKY Srinivasan if (net_device->send_buf_gpadl_handle) { 2263d541ac5SVitaly Kuznetsov ret = vmbus_teardown_gpadl(device->channel, 227c25aaf81SKY Srinivasan net_device->send_buf_gpadl_handle); 228c25aaf81SKY Srinivasan 229c25aaf81SKY Srinivasan /* If we failed here, we might as well return and have a leak 230c25aaf81SKY Srinivasan * rather than continue and a bugchk 231c25aaf81SKY Srinivasan */ 232c25aaf81SKY Srinivasan if (ret != 0) { 233c25aaf81SKY Srinivasan netdev_err(ndev, 234c25aaf81SKY Srinivasan "unable to teardown send buffer's gpadl\n"); 235c25aaf81SKY Srinivasan return ret; 236c25aaf81SKY Srinivasan } 2372f18423dSDave Jones net_device->send_buf_gpadl_handle = 0; 238c25aaf81SKY Srinivasan } 239c25aaf81SKY Srinivasan if (net_device->send_buf) { 240c51ed182SHaiyang Zhang /* Free up the send buffer */ 24106b47aacSKY Srinivasan vfree(net_device->send_buf); 242c25aaf81SKY Srinivasan net_device->send_buf = NULL; 243c25aaf81SKY Srinivasan } 244c25aaf81SKY Srinivasan kfree(net_device->send_section_map); 245c25aaf81SKY Srinivasan 24695fa0405SHaiyang Zhang return ret; 24795fa0405SHaiyang Zhang } 24895fa0405SHaiyang Zhang 249c25aaf81SKY Srinivasan static int netvsc_init_buf(struct hv_device *device) 25095fa0405SHaiyang Zhang { 25195fa0405SHaiyang Zhang int ret = 0; 25295fa0405SHaiyang Zhang struct netvsc_device *net_device; 25395fa0405SHaiyang Zhang struct nvsp_message *init_packet; 25495fa0405SHaiyang Zhang struct net_device *ndev; 2550a726c2bSK. Y. Srinivasan int node; 25695fa0405SHaiyang Zhang 25795fa0405SHaiyang Zhang net_device = get_outbound_net_device(device); 25895fa0405SHaiyang Zhang if (!net_device) 25995fa0405SHaiyang Zhang return -ENODEV; 2600a1275caSVitaly Kuznetsov ndev = hv_get_drvdata(device); 26195fa0405SHaiyang Zhang 2620a726c2bSK. Y. Srinivasan node = cpu_to_node(device->channel->target_cpu); 2630a726c2bSK. Y. Srinivasan net_device->recv_buf = vzalloc_node(net_device->recv_buf_size, node); 2640a726c2bSK. Y. Srinivasan if (!net_device->recv_buf) 265b679ef73SHaiyang Zhang net_device->recv_buf = vzalloc(net_device->recv_buf_size); 2660a726c2bSK. Y. Srinivasan 26795fa0405SHaiyang Zhang if (!net_device->recv_buf) { 26895fa0405SHaiyang Zhang netdev_err(ndev, "unable to allocate receive " 26995fa0405SHaiyang Zhang "buffer of size %d\n", net_device->recv_buf_size); 27095fa0405SHaiyang Zhang ret = -ENOMEM; 27195fa0405SHaiyang Zhang goto cleanup; 27295fa0405SHaiyang Zhang } 27395fa0405SHaiyang Zhang 27495fa0405SHaiyang Zhang /* 27595fa0405SHaiyang Zhang * Establish the gpadl handle for this buffer on this 27695fa0405SHaiyang Zhang * channel. Note: This call uses the vmbus connection rather 27795fa0405SHaiyang Zhang * than the channel to establish the gpadl handle. 27895fa0405SHaiyang Zhang */ 27995fa0405SHaiyang Zhang ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, 28095fa0405SHaiyang Zhang net_device->recv_buf_size, 28195fa0405SHaiyang Zhang &net_device->recv_buf_gpadl_handle); 28295fa0405SHaiyang Zhang if (ret != 0) { 28395fa0405SHaiyang Zhang netdev_err(ndev, 28495fa0405SHaiyang Zhang "unable to establish receive buffer's gpadl\n"); 28595fa0405SHaiyang Zhang goto cleanup; 28695fa0405SHaiyang Zhang } 28795fa0405SHaiyang Zhang 28895fa0405SHaiyang Zhang 28995fa0405SHaiyang Zhang /* Notify the NetVsp of the gpadl handle */ 29095fa0405SHaiyang Zhang init_packet = &net_device->channel_init_pkt; 29195fa0405SHaiyang Zhang 29295fa0405SHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 29395fa0405SHaiyang Zhang 29495fa0405SHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; 29595fa0405SHaiyang Zhang init_packet->msg.v1_msg.send_recv_buf. 29695fa0405SHaiyang Zhang gpadl_handle = net_device->recv_buf_gpadl_handle; 29795fa0405SHaiyang Zhang init_packet->msg.v1_msg. 29895fa0405SHaiyang Zhang send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 29995fa0405SHaiyang Zhang 30095fa0405SHaiyang Zhang /* Send the gpadl notification request */ 30195fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 30295fa0405SHaiyang Zhang sizeof(struct nvsp_message), 30395fa0405SHaiyang Zhang (unsigned long)init_packet, 30495fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 30595fa0405SHaiyang Zhang VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 30695fa0405SHaiyang Zhang if (ret != 0) { 30795fa0405SHaiyang Zhang netdev_err(ndev, 30895fa0405SHaiyang Zhang "unable to send receive buffer's gpadl to netvsp\n"); 30995fa0405SHaiyang Zhang goto cleanup; 31095fa0405SHaiyang Zhang } 31195fa0405SHaiyang Zhang 3125362855aSVitaly Kuznetsov wait_for_completion(&net_device->channel_init_wait); 31395fa0405SHaiyang Zhang 31495fa0405SHaiyang Zhang /* Check the response */ 31595fa0405SHaiyang Zhang if (init_packet->msg.v1_msg. 31695fa0405SHaiyang Zhang send_recv_buf_complete.status != NVSP_STAT_SUCCESS) { 31795fa0405SHaiyang Zhang netdev_err(ndev, "Unable to complete receive buffer " 31895fa0405SHaiyang Zhang "initialization with NetVsp - status %d\n", 31995fa0405SHaiyang Zhang init_packet->msg.v1_msg. 32095fa0405SHaiyang Zhang send_recv_buf_complete.status); 32195fa0405SHaiyang Zhang ret = -EINVAL; 32295fa0405SHaiyang Zhang goto cleanup; 32395fa0405SHaiyang Zhang } 32495fa0405SHaiyang Zhang 32595fa0405SHaiyang Zhang /* Parse the response */ 32695fa0405SHaiyang Zhang 32795fa0405SHaiyang Zhang net_device->recv_section_cnt = init_packet->msg. 32895fa0405SHaiyang Zhang v1_msg.send_recv_buf_complete.num_sections; 32995fa0405SHaiyang Zhang 330c1813200SHaiyang Zhang net_device->recv_section = kmemdup( 331c1813200SHaiyang Zhang init_packet->msg.v1_msg.send_recv_buf_complete.sections, 332c1813200SHaiyang Zhang net_device->recv_section_cnt * 333c1813200SHaiyang Zhang sizeof(struct nvsp_1_receive_buffer_section), 33495fa0405SHaiyang Zhang GFP_KERNEL); 33595fa0405SHaiyang Zhang if (net_device->recv_section == NULL) { 33695fa0405SHaiyang Zhang ret = -EINVAL; 33795fa0405SHaiyang Zhang goto cleanup; 33895fa0405SHaiyang Zhang } 33995fa0405SHaiyang Zhang 34095fa0405SHaiyang Zhang /* 34195fa0405SHaiyang Zhang * For 1st release, there should only be 1 section that represents the 34295fa0405SHaiyang Zhang * entire receive buffer 34395fa0405SHaiyang Zhang */ 34495fa0405SHaiyang Zhang if (net_device->recv_section_cnt != 1 || 34595fa0405SHaiyang Zhang net_device->recv_section->offset != 0) { 34695fa0405SHaiyang Zhang ret = -EINVAL; 34795fa0405SHaiyang Zhang goto cleanup; 34895fa0405SHaiyang Zhang } 34995fa0405SHaiyang Zhang 350c25aaf81SKY Srinivasan /* Now setup the send buffer. 351c25aaf81SKY Srinivasan */ 3525defde59SK. Y. Srinivasan net_device->send_buf = vzalloc_node(net_device->send_buf_size, node); 3535defde59SK. Y. Srinivasan if (!net_device->send_buf) 35406b47aacSKY Srinivasan net_device->send_buf = vzalloc(net_device->send_buf_size); 355c25aaf81SKY Srinivasan if (!net_device->send_buf) { 356c25aaf81SKY Srinivasan netdev_err(ndev, "unable to allocate send " 357c25aaf81SKY Srinivasan "buffer of size %d\n", net_device->send_buf_size); 358c25aaf81SKY Srinivasan ret = -ENOMEM; 359c25aaf81SKY Srinivasan goto cleanup; 360c25aaf81SKY Srinivasan } 361c25aaf81SKY Srinivasan 362c25aaf81SKY Srinivasan /* Establish the gpadl handle for this buffer on this 363c25aaf81SKY Srinivasan * channel. Note: This call uses the vmbus connection rather 364c25aaf81SKY Srinivasan * than the channel to establish the gpadl handle. 365c25aaf81SKY Srinivasan */ 366c25aaf81SKY Srinivasan ret = vmbus_establish_gpadl(device->channel, net_device->send_buf, 367c25aaf81SKY Srinivasan net_device->send_buf_size, 368c25aaf81SKY Srinivasan &net_device->send_buf_gpadl_handle); 369c25aaf81SKY Srinivasan if (ret != 0) { 370c25aaf81SKY Srinivasan netdev_err(ndev, 371c25aaf81SKY Srinivasan "unable to establish send buffer's gpadl\n"); 372c25aaf81SKY Srinivasan goto cleanup; 373c25aaf81SKY Srinivasan } 374c25aaf81SKY Srinivasan 375c25aaf81SKY Srinivasan /* Notify the NetVsp of the gpadl handle */ 376c25aaf81SKY Srinivasan init_packet = &net_device->channel_init_pkt; 377c25aaf81SKY Srinivasan memset(init_packet, 0, sizeof(struct nvsp_message)); 378c25aaf81SKY Srinivasan init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF; 379c51ed182SHaiyang Zhang init_packet->msg.v1_msg.send_send_buf.gpadl_handle = 380c25aaf81SKY Srinivasan net_device->send_buf_gpadl_handle; 381c51ed182SHaiyang Zhang init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID; 382c25aaf81SKY Srinivasan 383c25aaf81SKY Srinivasan /* Send the gpadl notification request */ 384c25aaf81SKY Srinivasan ret = vmbus_sendpacket(device->channel, init_packet, 385c25aaf81SKY Srinivasan sizeof(struct nvsp_message), 386c25aaf81SKY Srinivasan (unsigned long)init_packet, 387c25aaf81SKY Srinivasan VM_PKT_DATA_INBAND, 388c25aaf81SKY Srinivasan VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 389c25aaf81SKY Srinivasan if (ret != 0) { 390c25aaf81SKY Srinivasan netdev_err(ndev, 391c25aaf81SKY Srinivasan "unable to send send buffer's gpadl to netvsp\n"); 392c25aaf81SKY Srinivasan goto cleanup; 393c25aaf81SKY Srinivasan } 394c25aaf81SKY Srinivasan 3955362855aSVitaly Kuznetsov wait_for_completion(&net_device->channel_init_wait); 396c25aaf81SKY Srinivasan 397c25aaf81SKY Srinivasan /* Check the response */ 398c25aaf81SKY Srinivasan if (init_packet->msg.v1_msg. 399c25aaf81SKY Srinivasan send_send_buf_complete.status != NVSP_STAT_SUCCESS) { 400c25aaf81SKY Srinivasan netdev_err(ndev, "Unable to complete send buffer " 401c25aaf81SKY Srinivasan "initialization with NetVsp - status %d\n", 402c25aaf81SKY Srinivasan init_packet->msg.v1_msg. 403c51ed182SHaiyang Zhang send_send_buf_complete.status); 404c25aaf81SKY Srinivasan ret = -EINVAL; 405c25aaf81SKY Srinivasan goto cleanup; 406c25aaf81SKY Srinivasan } 407c25aaf81SKY Srinivasan 408c25aaf81SKY Srinivasan /* Parse the response */ 409c25aaf81SKY Srinivasan net_device->send_section_size = init_packet->msg. 410c25aaf81SKY Srinivasan v1_msg.send_send_buf_complete.section_size; 411c25aaf81SKY Srinivasan 412c25aaf81SKY Srinivasan /* Section count is simply the size divided by the section size. 413c25aaf81SKY Srinivasan */ 414c25aaf81SKY Srinivasan net_device->send_section_cnt = 415c25aaf81SKY Srinivasan net_device->send_buf_size/net_device->send_section_size; 416c25aaf81SKY Srinivasan 417c25aaf81SKY Srinivasan dev_info(&device->device, "Send section size: %d, Section count:%d\n", 418c25aaf81SKY Srinivasan net_device->send_section_size, net_device->send_section_cnt); 419c25aaf81SKY Srinivasan 420c25aaf81SKY Srinivasan /* Setup state for managing the send buffer. */ 421c25aaf81SKY Srinivasan net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt, 422c25aaf81SKY Srinivasan BITS_PER_LONG); 423c25aaf81SKY Srinivasan 424e53a9c2aSStephen Hemminger net_device->send_section_map = kcalloc(net_device->map_words, 425e53a9c2aSStephen Hemminger sizeof(ulong), GFP_KERNEL); 426dd1d3f8fSWei Yongjun if (net_device->send_section_map == NULL) { 427dd1d3f8fSWei Yongjun ret = -ENOMEM; 428c25aaf81SKY Srinivasan goto cleanup; 429dd1d3f8fSWei Yongjun } 430c25aaf81SKY Srinivasan 43195fa0405SHaiyang Zhang goto exit; 43295fa0405SHaiyang Zhang 43395fa0405SHaiyang Zhang cleanup: 4343d541ac5SVitaly Kuznetsov netvsc_destroy_buf(device); 43595fa0405SHaiyang Zhang 43695fa0405SHaiyang Zhang exit: 43795fa0405SHaiyang Zhang return ret; 43895fa0405SHaiyang Zhang } 43995fa0405SHaiyang Zhang 44095fa0405SHaiyang Zhang 441f157e78dSHaiyang Zhang /* Negotiate NVSP protocol version */ 442f157e78dSHaiyang Zhang static int negotiate_nvsp_ver(struct hv_device *device, 443f157e78dSHaiyang Zhang struct netvsc_device *net_device, 444f157e78dSHaiyang Zhang struct nvsp_message *init_packet, 445f157e78dSHaiyang Zhang u32 nvsp_ver) 44695fa0405SHaiyang Zhang { 4470a1275caSVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 4487390fe9cSNicholas Mc Guire int ret; 449f157e78dSHaiyang Zhang 450f157e78dSHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 451f157e78dSHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; 452f157e78dSHaiyang Zhang init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; 453f157e78dSHaiyang Zhang init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; 454f157e78dSHaiyang Zhang 455f157e78dSHaiyang Zhang /* Send the init request */ 456f157e78dSHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 457f157e78dSHaiyang Zhang sizeof(struct nvsp_message), 458f157e78dSHaiyang Zhang (unsigned long)init_packet, 459f157e78dSHaiyang Zhang VM_PKT_DATA_INBAND, 460f157e78dSHaiyang Zhang VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 461f157e78dSHaiyang Zhang 462f157e78dSHaiyang Zhang if (ret != 0) 463f157e78dSHaiyang Zhang return ret; 464f157e78dSHaiyang Zhang 4655362855aSVitaly Kuznetsov wait_for_completion(&net_device->channel_init_wait); 466f157e78dSHaiyang Zhang 467f157e78dSHaiyang Zhang if (init_packet->msg.init_msg.init_complete.status != 468f157e78dSHaiyang Zhang NVSP_STAT_SUCCESS) 469f157e78dSHaiyang Zhang return -EINVAL; 470f157e78dSHaiyang Zhang 471a1eabb01SHaiyang Zhang if (nvsp_ver == NVSP_PROTOCOL_VERSION_1) 472f157e78dSHaiyang Zhang return 0; 473f157e78dSHaiyang Zhang 47471790a27SHaiyang Zhang /* NVSPv2 or later: Send NDIS config */ 475f157e78dSHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 476f157e78dSHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; 4770a1275caSVitaly Kuznetsov init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN; 4781f5f3a75SHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; 479f157e78dSHaiyang Zhang 4807f5d5af0SHaiyang Zhang if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) { 48171790a27SHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; 48271790a27SHaiyang Zhang 4837f5d5af0SHaiyang Zhang /* Teaming bit is needed to receive link speed updates */ 4847f5d5af0SHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1; 4857f5d5af0SHaiyang Zhang } 4867f5d5af0SHaiyang Zhang 487f157e78dSHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 488f157e78dSHaiyang Zhang sizeof(struct nvsp_message), 489f157e78dSHaiyang Zhang (unsigned long)init_packet, 490f157e78dSHaiyang Zhang VM_PKT_DATA_INBAND, 0); 491f157e78dSHaiyang Zhang 492f157e78dSHaiyang Zhang return ret; 493f157e78dSHaiyang Zhang } 494f157e78dSHaiyang Zhang 495f157e78dSHaiyang Zhang static int netvsc_connect_vsp(struct hv_device *device) 496f157e78dSHaiyang Zhang { 497f157e78dSHaiyang Zhang int ret; 49895fa0405SHaiyang Zhang struct netvsc_device *net_device; 49995fa0405SHaiyang Zhang struct nvsp_message *init_packet; 50095fa0405SHaiyang Zhang int ndis_version; 501a1eabb01SHaiyang Zhang u32 ver_list[] = { NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2, 502a1eabb01SHaiyang Zhang NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 }; 503a1eabb01SHaiyang Zhang int i, num_ver = 4; /* number of different NVSP versions */ 50495fa0405SHaiyang Zhang 50595fa0405SHaiyang Zhang net_device = get_outbound_net_device(device); 50695fa0405SHaiyang Zhang if (!net_device) 50795fa0405SHaiyang Zhang return -ENODEV; 50895fa0405SHaiyang Zhang 50995fa0405SHaiyang Zhang init_packet = &net_device->channel_init_pkt; 51095fa0405SHaiyang Zhang 511f157e78dSHaiyang Zhang /* Negotiate the latest NVSP protocol supported */ 512a1eabb01SHaiyang Zhang for (i = num_ver - 1; i >= 0; i--) 513f157e78dSHaiyang Zhang if (negotiate_nvsp_ver(device, net_device, init_packet, 514a1eabb01SHaiyang Zhang ver_list[i]) == 0) { 515a1eabb01SHaiyang Zhang net_device->nvsp_version = ver_list[i]; 516a1eabb01SHaiyang Zhang break; 517a1eabb01SHaiyang Zhang } 518a1eabb01SHaiyang Zhang 519a1eabb01SHaiyang Zhang if (i < 0) { 52095fa0405SHaiyang Zhang ret = -EPROTO; 52195fa0405SHaiyang Zhang goto cleanup; 52295fa0405SHaiyang Zhang } 523f157e78dSHaiyang Zhang 524f157e78dSHaiyang Zhang pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); 525f157e78dSHaiyang Zhang 52695fa0405SHaiyang Zhang /* Send the ndis version */ 52795fa0405SHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 52895fa0405SHaiyang Zhang 529a1eabb01SHaiyang Zhang if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4) 5301f73db49SKY Srinivasan ndis_version = 0x00060001; 531a1eabb01SHaiyang Zhang else 532a1eabb01SHaiyang Zhang ndis_version = 0x0006001e; 53395fa0405SHaiyang Zhang 53495fa0405SHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; 53595fa0405SHaiyang Zhang init_packet->msg.v1_msg. 53695fa0405SHaiyang Zhang send_ndis_ver.ndis_major_ver = 53795fa0405SHaiyang Zhang (ndis_version & 0xFFFF0000) >> 16; 53895fa0405SHaiyang Zhang init_packet->msg.v1_msg. 53995fa0405SHaiyang Zhang send_ndis_ver.ndis_minor_ver = 54095fa0405SHaiyang Zhang ndis_version & 0xFFFF; 54195fa0405SHaiyang Zhang 54295fa0405SHaiyang Zhang /* Send the init request */ 54395fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 54495fa0405SHaiyang Zhang sizeof(struct nvsp_message), 54595fa0405SHaiyang Zhang (unsigned long)init_packet, 54695fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 0); 54795fa0405SHaiyang Zhang if (ret != 0) 54895fa0405SHaiyang Zhang goto cleanup; 54995fa0405SHaiyang Zhang 55095fa0405SHaiyang Zhang /* Post the big receive buffer to NetVSP */ 55199d3016dSHaiyang Zhang if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2) 55299d3016dSHaiyang Zhang net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY; 55399d3016dSHaiyang Zhang else 55499d3016dSHaiyang Zhang net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; 555c25aaf81SKY Srinivasan net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE; 55699d3016dSHaiyang Zhang 557c25aaf81SKY Srinivasan ret = netvsc_init_buf(device); 55895fa0405SHaiyang Zhang 55995fa0405SHaiyang Zhang cleanup: 56095fa0405SHaiyang Zhang return ret; 56195fa0405SHaiyang Zhang } 56295fa0405SHaiyang Zhang 5633d541ac5SVitaly Kuznetsov static void netvsc_disconnect_vsp(struct hv_device *device) 56495fa0405SHaiyang Zhang { 5653d541ac5SVitaly Kuznetsov netvsc_destroy_buf(device); 56695fa0405SHaiyang Zhang } 56795fa0405SHaiyang Zhang 56895fa0405SHaiyang Zhang /* 56995fa0405SHaiyang Zhang * netvsc_device_remove - Callback when the root bus device is removed 57095fa0405SHaiyang Zhang */ 57195fa0405SHaiyang Zhang int netvsc_device_remove(struct hv_device *device) 57295fa0405SHaiyang Zhang { 5733d541ac5SVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 5743d541ac5SVitaly Kuznetsov struct net_device_context *net_device_ctx = netdev_priv(ndev); 5753d541ac5SVitaly Kuznetsov struct netvsc_device *net_device = net_device_ctx->nvdev; 57695fa0405SHaiyang Zhang 5773d541ac5SVitaly Kuznetsov netvsc_disconnect_vsp(device); 57895fa0405SHaiyang Zhang 5793d541ac5SVitaly Kuznetsov net_device_ctx->nvdev = NULL; 58095fa0405SHaiyang Zhang 58195fa0405SHaiyang Zhang /* 58295fa0405SHaiyang Zhang * At this point, no one should be accessing net_device 58395fa0405SHaiyang Zhang * except in here 58495fa0405SHaiyang Zhang */ 58595fa0405SHaiyang Zhang dev_notice(&device->device, "net device safe to remove\n"); 58695fa0405SHaiyang Zhang 58795fa0405SHaiyang Zhang /* Now, we can close the channel safely */ 58895fa0405SHaiyang Zhang vmbus_close(device->channel); 58995fa0405SHaiyang Zhang 59095fa0405SHaiyang Zhang /* Release all resources */ 5915b54dac8SHaiyang Zhang vfree(net_device->sub_cb_buf); 592f90251c8SHaiyang Zhang free_netvsc_device(net_device); 59395fa0405SHaiyang Zhang return 0; 59495fa0405SHaiyang Zhang } 59595fa0405SHaiyang Zhang 59633be96e4SHaiyang Zhang 59733be96e4SHaiyang Zhang #define RING_AVAIL_PERCENT_HIWATER 20 59833be96e4SHaiyang Zhang #define RING_AVAIL_PERCENT_LOWATER 10 59933be96e4SHaiyang Zhang 60033be96e4SHaiyang Zhang /* 60133be96e4SHaiyang Zhang * Get the percentage of available bytes to write in the ring. 60233be96e4SHaiyang Zhang * The return value is in range from 0 to 100. 60333be96e4SHaiyang Zhang */ 60433be96e4SHaiyang Zhang static inline u32 hv_ringbuf_avail_percent( 60533be96e4SHaiyang Zhang struct hv_ring_buffer_info *ring_info) 60633be96e4SHaiyang Zhang { 60733be96e4SHaiyang Zhang u32 avail_read, avail_write; 60833be96e4SHaiyang Zhang 60933be96e4SHaiyang Zhang hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); 61033be96e4SHaiyang Zhang 61133be96e4SHaiyang Zhang return avail_write * 100 / ring_info->ring_datasize; 61233be96e4SHaiyang Zhang } 61333be96e4SHaiyang Zhang 614c25aaf81SKY Srinivasan static inline void netvsc_free_send_slot(struct netvsc_device *net_device, 615c25aaf81SKY Srinivasan u32 index) 616c25aaf81SKY Srinivasan { 617c25aaf81SKY Srinivasan sync_change_bit(index, net_device->send_section_map); 618c25aaf81SKY Srinivasan } 619c25aaf81SKY Srinivasan 62097c1723aSKY Srinivasan static void netvsc_send_completion(struct netvsc_device *net_device, 62125b85ee8SKY Srinivasan struct vmbus_channel *incoming_channel, 62297c1723aSKY Srinivasan struct hv_device *device, 62395fa0405SHaiyang Zhang struct vmpacket_descriptor *packet) 62495fa0405SHaiyang Zhang { 62595fa0405SHaiyang Zhang struct nvsp_message *nvsp_packet; 62695fa0405SHaiyang Zhang struct hv_netvsc_packet *nvsc_packet; 6273d541ac5SVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 6283d541ac5SVitaly Kuznetsov struct net_device_context *net_device_ctx = netdev_priv(ndev); 629c25aaf81SKY Srinivasan u32 send_index; 6303a3d9a0aSKY Srinivasan struct sk_buff *skb; 63195fa0405SHaiyang Zhang 63295fa0405SHaiyang Zhang nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 63395fa0405SHaiyang Zhang (packet->offset8 << 3)); 63495fa0405SHaiyang Zhang 63595fa0405SHaiyang Zhang if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) || 63695fa0405SHaiyang Zhang (nvsp_packet->hdr.msg_type == 63795fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) || 63895fa0405SHaiyang Zhang (nvsp_packet->hdr.msg_type == 6395b54dac8SHaiyang Zhang NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE) || 6405b54dac8SHaiyang Zhang (nvsp_packet->hdr.msg_type == 6415b54dac8SHaiyang Zhang NVSP_MSG5_TYPE_SUBCHANNEL)) { 64295fa0405SHaiyang Zhang /* Copy the response back */ 64395fa0405SHaiyang Zhang memcpy(&net_device->channel_init_pkt, nvsp_packet, 64495fa0405SHaiyang Zhang sizeof(struct nvsp_message)); 64595fa0405SHaiyang Zhang complete(&net_device->channel_init_wait); 64695fa0405SHaiyang Zhang } else if (nvsp_packet->hdr.msg_type == 64795fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) { 64833be96e4SHaiyang Zhang int num_outstanding_sends; 6495b54dac8SHaiyang Zhang u16 q_idx = 0; 6505b54dac8SHaiyang Zhang struct vmbus_channel *channel = device->channel; 6515b54dac8SHaiyang Zhang int queue_sends; 65233be96e4SHaiyang Zhang 65395fa0405SHaiyang Zhang /* Get the send context */ 6543a3d9a0aSKY Srinivasan skb = (struct sk_buff *)(unsigned long)packet->trans_id; 65595fa0405SHaiyang Zhang 65695fa0405SHaiyang Zhang /* Notify the layer above us */ 6573a3d9a0aSKY Srinivasan if (skb) { 6583a3d9a0aSKY Srinivasan nvsc_packet = (struct hv_netvsc_packet *) skb->cb; 659c25aaf81SKY Srinivasan send_index = nvsc_packet->send_buf_index; 660c25aaf81SKY Srinivasan if (send_index != NETVSC_INVALID_INDEX) 661c25aaf81SKY Srinivasan netvsc_free_send_slot(net_device, send_index); 6625b54dac8SHaiyang Zhang q_idx = nvsc_packet->q_idx; 66325b85ee8SKY Srinivasan channel = incoming_channel; 6643a3d9a0aSKY Srinivasan dev_kfree_skb_any(skb); 6655b54dac8SHaiyang Zhang } 66695fa0405SHaiyang Zhang 66733be96e4SHaiyang Zhang num_outstanding_sends = 66833be96e4SHaiyang Zhang atomic_dec_return(&net_device->num_outstanding_sends); 6695b54dac8SHaiyang Zhang queue_sends = atomic_dec_return(&net_device-> 6705b54dac8SHaiyang Zhang queue_sends[q_idx]); 6711d06825bSHaiyang Zhang 672dc5cd894SHaiyang Zhang if (net_device->destroy && num_outstanding_sends == 0) 673dc5cd894SHaiyang Zhang wake_up(&net_device->wait_drain); 674dc5cd894SHaiyang Zhang 6755b54dac8SHaiyang Zhang if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) && 6763d541ac5SVitaly Kuznetsov !net_device_ctx->start_remove && 6775b54dac8SHaiyang Zhang (hv_ringbuf_avail_percent(&channel->outbound) > 6785b54dac8SHaiyang Zhang RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) 6795b54dac8SHaiyang Zhang netif_tx_wake_queue(netdev_get_tx_queue( 6805b54dac8SHaiyang Zhang ndev, q_idx)); 68195fa0405SHaiyang Zhang } else { 68295fa0405SHaiyang Zhang netdev_err(ndev, "Unknown send completion packet type- " 68395fa0405SHaiyang Zhang "%d received!!\n", nvsp_packet->hdr.msg_type); 68495fa0405SHaiyang Zhang } 68595fa0405SHaiyang Zhang 68695fa0405SHaiyang Zhang } 68795fa0405SHaiyang Zhang 688c25aaf81SKY Srinivasan static u32 netvsc_get_next_send_section(struct netvsc_device *net_device) 689c25aaf81SKY Srinivasan { 690c25aaf81SKY Srinivasan unsigned long index; 691c25aaf81SKY Srinivasan u32 max_words = net_device->map_words; 692c25aaf81SKY Srinivasan unsigned long *map_addr = (unsigned long *)net_device->send_section_map; 693c25aaf81SKY Srinivasan u32 section_cnt = net_device->send_section_cnt; 694c25aaf81SKY Srinivasan int ret_val = NETVSC_INVALID_INDEX; 695c25aaf81SKY Srinivasan int i; 696c25aaf81SKY Srinivasan int prev_val; 697c25aaf81SKY Srinivasan 698c25aaf81SKY Srinivasan for (i = 0; i < max_words; i++) { 699c25aaf81SKY Srinivasan if (!~(map_addr[i])) 700c25aaf81SKY Srinivasan continue; 701c25aaf81SKY Srinivasan index = ffz(map_addr[i]); 702c25aaf81SKY Srinivasan prev_val = sync_test_and_set_bit(index, &map_addr[i]); 703c25aaf81SKY Srinivasan if (prev_val) 704c25aaf81SKY Srinivasan continue; 705c25aaf81SKY Srinivasan if ((index + (i * BITS_PER_LONG)) >= section_cnt) 706c25aaf81SKY Srinivasan break; 707c25aaf81SKY Srinivasan ret_val = (index + (i * BITS_PER_LONG)); 708c25aaf81SKY Srinivasan break; 709c25aaf81SKY Srinivasan } 710c25aaf81SKY Srinivasan return ret_val; 711c25aaf81SKY Srinivasan } 712c25aaf81SKY Srinivasan 713da19fcd0SLad, Prabhakar static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device, 714c25aaf81SKY Srinivasan unsigned int section_index, 7157c3877f2SHaiyang Zhang u32 pend_size, 71624476760SKY Srinivasan struct hv_netvsc_packet *packet, 717a9f2e2d6SKY Srinivasan struct rndis_message *rndis_msg, 718694a9fb0SKY Srinivasan struct hv_page_buffer **pb, 719694a9fb0SKY Srinivasan struct sk_buff *skb) 720c25aaf81SKY Srinivasan { 721c25aaf81SKY Srinivasan char *start = net_device->send_buf; 7227c3877f2SHaiyang Zhang char *dest = start + (section_index * net_device->send_section_size) 7237c3877f2SHaiyang Zhang + pend_size; 724c25aaf81SKY Srinivasan int i; 725694a9fb0SKY Srinivasan bool is_data_pkt = (skb != NULL) ? true : false; 726bde79be5SKY Srinivasan bool xmit_more = (skb != NULL) ? skb->xmit_more : false; 727c25aaf81SKY Srinivasan u32 msg_size = 0; 7287c3877f2SHaiyang Zhang u32 padding = 0; 7297c3877f2SHaiyang Zhang u32 remain = packet->total_data_buflen % net_device->pkt_align; 730aa0a34beSHaiyang Zhang u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt : 731aa0a34beSHaiyang Zhang packet->page_buf_cnt; 7327c3877f2SHaiyang Zhang 7337c3877f2SHaiyang Zhang /* Add padding */ 734bde79be5SKY Srinivasan if (is_data_pkt && xmit_more && remain && 735aa0a34beSHaiyang Zhang !packet->cp_partial) { 7367c3877f2SHaiyang Zhang padding = net_device->pkt_align - remain; 73724476760SKY Srinivasan rndis_msg->msg_len += padding; 7387c3877f2SHaiyang Zhang packet->total_data_buflen += padding; 7397c3877f2SHaiyang Zhang } 740c25aaf81SKY Srinivasan 741aa0a34beSHaiyang Zhang for (i = 0; i < page_count; i++) { 742a9f2e2d6SKY Srinivasan char *src = phys_to_virt((*pb)[i].pfn << PAGE_SHIFT); 743a9f2e2d6SKY Srinivasan u32 offset = (*pb)[i].offset; 744a9f2e2d6SKY Srinivasan u32 len = (*pb)[i].len; 745c25aaf81SKY Srinivasan 746c25aaf81SKY Srinivasan memcpy(dest, (src + offset), len); 747c25aaf81SKY Srinivasan msg_size += len; 748c25aaf81SKY Srinivasan dest += len; 749c25aaf81SKY Srinivasan } 7507c3877f2SHaiyang Zhang 7517c3877f2SHaiyang Zhang if (padding) { 7527c3877f2SHaiyang Zhang memset(dest, 0, padding); 7537c3877f2SHaiyang Zhang msg_size += padding; 7547c3877f2SHaiyang Zhang } 7557c3877f2SHaiyang Zhang 756c25aaf81SKY Srinivasan return msg_size; 757c25aaf81SKY Srinivasan } 758c25aaf81SKY Srinivasan 7597c3877f2SHaiyang Zhang static inline int netvsc_send_pkt( 7600a1275caSVitaly Kuznetsov struct hv_device *device, 7617c3877f2SHaiyang Zhang struct hv_netvsc_packet *packet, 762a9f2e2d6SKY Srinivasan struct netvsc_device *net_device, 7633a3d9a0aSKY Srinivasan struct hv_page_buffer **pb, 7643a3d9a0aSKY Srinivasan struct sk_buff *skb) 76595fa0405SHaiyang Zhang { 7667c3877f2SHaiyang Zhang struct nvsp_message nvmsg; 7673a67c9ccSKY Srinivasan u16 q_idx = packet->q_idx; 7688b9fbe1aSVitaly Kuznetsov struct vmbus_channel *out_channel = net_device->chn_table[q_idx]; 7690a1275caSVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 7707c3877f2SHaiyang Zhang u64 req_id; 7717c3877f2SHaiyang Zhang int ret; 772aa0a34beSHaiyang Zhang struct hv_page_buffer *pgbuf; 77382fa3c77SKY Srinivasan u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound); 774bde79be5SKY Srinivasan bool xmit_more = (skb != NULL) ? skb->xmit_more : false; 775c25aaf81SKY Srinivasan 7767c3877f2SHaiyang Zhang nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; 777694a9fb0SKY Srinivasan if (skb != NULL) { 77895fa0405SHaiyang Zhang /* 0 is RMC_DATA; */ 7797c3877f2SHaiyang Zhang nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 0; 78095fa0405SHaiyang Zhang } else { 78195fa0405SHaiyang Zhang /* 1 is RMC_CONTROL; */ 7827c3877f2SHaiyang Zhang nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 1; 78395fa0405SHaiyang Zhang } 78495fa0405SHaiyang Zhang 7857c3877f2SHaiyang Zhang nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_index = 7867c3877f2SHaiyang Zhang packet->send_buf_index; 7877c3877f2SHaiyang Zhang if (packet->send_buf_index == NETVSC_INVALID_INDEX) 7887c3877f2SHaiyang Zhang nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; 7897c3877f2SHaiyang Zhang else 7907c3877f2SHaiyang Zhang nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 7917c3877f2SHaiyang Zhang packet->total_data_buflen; 79295fa0405SHaiyang Zhang 7933a3d9a0aSKY Srinivasan req_id = (ulong)skb; 794f1ea3cd7SHaiyang Zhang 795c3582a2cSHaiyang Zhang if (out_channel->rescind) 796c3582a2cSHaiyang Zhang return -ENODEV; 797c3582a2cSHaiyang Zhang 79882fa3c77SKY Srinivasan /* 79982fa3c77SKY Srinivasan * It is possible that once we successfully place this packet 80082fa3c77SKY Srinivasan * on the ringbuffer, we may stop the queue. In that case, we want 80182fa3c77SKY Srinivasan * to notify the host independent of the xmit_more flag. We don't 80282fa3c77SKY Srinivasan * need to be precise here; in the worst case we may signal the host 80382fa3c77SKY Srinivasan * unnecessarily. 80482fa3c77SKY Srinivasan */ 80582fa3c77SKY Srinivasan if (ring_avail < (RING_AVAIL_PERCENT_LOWATER + 1)) 806bde79be5SKY Srinivasan xmit_more = false; 80782fa3c77SKY Srinivasan 80895fa0405SHaiyang Zhang if (packet->page_buf_cnt) { 809a9f2e2d6SKY Srinivasan pgbuf = packet->cp_partial ? (*pb) + 810a9f2e2d6SKY Srinivasan packet->rmsg_pgcnt : (*pb); 81182fa3c77SKY Srinivasan ret = vmbus_sendpacket_pagebuffer_ctl(out_channel, 812aa0a34beSHaiyang Zhang pgbuf, 81395fa0405SHaiyang Zhang packet->page_buf_cnt, 8147c3877f2SHaiyang Zhang &nvmsg, 81595fa0405SHaiyang Zhang sizeof(struct nvsp_message), 81682fa3c77SKY Srinivasan req_id, 81782fa3c77SKY Srinivasan VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED, 818bde79be5SKY Srinivasan !xmit_more); 81995fa0405SHaiyang Zhang } else { 82082fa3c77SKY Srinivasan ret = vmbus_sendpacket_ctl(out_channel, &nvmsg, 82195fa0405SHaiyang Zhang sizeof(struct nvsp_message), 822f1ea3cd7SHaiyang Zhang req_id, 82395fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 82482fa3c77SKY Srinivasan VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED, 825bde79be5SKY Srinivasan !xmit_more); 82695fa0405SHaiyang Zhang } 82795fa0405SHaiyang Zhang 8281d06825bSHaiyang Zhang if (ret == 0) { 8291d06825bSHaiyang Zhang atomic_inc(&net_device->num_outstanding_sends); 8303a67c9ccSKY Srinivasan atomic_inc(&net_device->queue_sends[q_idx]); 8315b54dac8SHaiyang Zhang 83282fa3c77SKY Srinivasan if (ring_avail < RING_AVAIL_PERCENT_LOWATER) { 83382fa3c77SKY Srinivasan netif_tx_stop_queue(netdev_get_tx_queue(ndev, q_idx)); 8345b54dac8SHaiyang Zhang 83533be96e4SHaiyang Zhang if (atomic_read(&net_device-> 8363a67c9ccSKY Srinivasan queue_sends[q_idx]) < 1) 8375b54dac8SHaiyang Zhang netif_tx_wake_queue(netdev_get_tx_queue( 8383a67c9ccSKY Srinivasan ndev, q_idx)); 83933be96e4SHaiyang Zhang } 8401d06825bSHaiyang Zhang } else if (ret == -EAGAIN) { 8415b54dac8SHaiyang Zhang netif_tx_stop_queue(netdev_get_tx_queue( 8423a67c9ccSKY Srinivasan ndev, q_idx)); 8433a67c9ccSKY Srinivasan if (atomic_read(&net_device->queue_sends[q_idx]) < 1) { 8445b54dac8SHaiyang Zhang netif_tx_wake_queue(netdev_get_tx_queue( 8453a67c9ccSKY Srinivasan ndev, q_idx)); 84633be96e4SHaiyang Zhang ret = -ENOSPC; 84733be96e4SHaiyang Zhang } 8481d06825bSHaiyang Zhang } else { 84995fa0405SHaiyang Zhang netdev_err(ndev, "Unable to send packet %p ret %d\n", 85095fa0405SHaiyang Zhang packet, ret); 8511d06825bSHaiyang Zhang } 85295fa0405SHaiyang Zhang 8537c3877f2SHaiyang Zhang return ret; 8547c3877f2SHaiyang Zhang } 8557c3877f2SHaiyang Zhang 856c85e4924SHaiyang Zhang /* Move packet out of multi send data (msd), and clear msd */ 857c85e4924SHaiyang Zhang static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send, 858c85e4924SHaiyang Zhang struct sk_buff **msd_skb, 859c85e4924SHaiyang Zhang struct multi_send_data *msdp) 860c85e4924SHaiyang Zhang { 861c85e4924SHaiyang Zhang *msd_skb = msdp->skb; 862c85e4924SHaiyang Zhang *msd_send = msdp->pkt; 863c85e4924SHaiyang Zhang msdp->skb = NULL; 864c85e4924SHaiyang Zhang msdp->pkt = NULL; 865c85e4924SHaiyang Zhang msdp->count = 0; 866c85e4924SHaiyang Zhang } 867c85e4924SHaiyang Zhang 8687c3877f2SHaiyang Zhang int netvsc_send(struct hv_device *device, 86924476760SKY Srinivasan struct hv_netvsc_packet *packet, 870a9f2e2d6SKY Srinivasan struct rndis_message *rndis_msg, 8713a3d9a0aSKY Srinivasan struct hv_page_buffer **pb, 8723a3d9a0aSKY Srinivasan struct sk_buff *skb) 8737c3877f2SHaiyang Zhang { 8747c3877f2SHaiyang Zhang struct netvsc_device *net_device; 8757c3877f2SHaiyang Zhang int ret = 0, m_ret = 0; 8767c3877f2SHaiyang Zhang struct vmbus_channel *out_channel; 8777c3877f2SHaiyang Zhang u16 q_idx = packet->q_idx; 8787c3877f2SHaiyang Zhang u32 pktlen = packet->total_data_buflen, msd_len = 0; 8797c3877f2SHaiyang Zhang unsigned int section_index = NETVSC_INVALID_INDEX; 8807c3877f2SHaiyang Zhang struct multi_send_data *msdp; 8817c3877f2SHaiyang Zhang struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL; 882c85e4924SHaiyang Zhang struct sk_buff *msd_skb = NULL; 883aa0a34beSHaiyang Zhang bool try_batch; 884bde79be5SKY Srinivasan bool xmit_more = (skb != NULL) ? skb->xmit_more : false; 8857c3877f2SHaiyang Zhang 8867c3877f2SHaiyang Zhang net_device = get_outbound_net_device(device); 8877c3877f2SHaiyang Zhang if (!net_device) 8887c3877f2SHaiyang Zhang return -ENODEV; 8897c3877f2SHaiyang Zhang 8908b9fbe1aSVitaly Kuznetsov out_channel = net_device->chn_table[q_idx]; 89125b85ee8SKY Srinivasan 8927c3877f2SHaiyang Zhang packet->send_buf_index = NETVSC_INVALID_INDEX; 893aa0a34beSHaiyang Zhang packet->cp_partial = false; 8947c3877f2SHaiyang Zhang 895cf8190e4SHaiyang Zhang /* Send control message directly without accessing msd (Multi-Send 896cf8190e4SHaiyang Zhang * Data) field which may be changed during data packet processing. 897cf8190e4SHaiyang Zhang */ 898cf8190e4SHaiyang Zhang if (!skb) { 899cf8190e4SHaiyang Zhang cur_send = packet; 900cf8190e4SHaiyang Zhang goto send_now; 901cf8190e4SHaiyang Zhang } 902cf8190e4SHaiyang Zhang 9037c3877f2SHaiyang Zhang msdp = &net_device->msd[q_idx]; 9047c3877f2SHaiyang Zhang 9057c3877f2SHaiyang Zhang /* batch packets in send buffer if possible */ 9067c3877f2SHaiyang Zhang if (msdp->pkt) 9077c3877f2SHaiyang Zhang msd_len = msdp->pkt->total_data_buflen; 9087c3877f2SHaiyang Zhang 909694a9fb0SKY Srinivasan try_batch = (skb != NULL) && msd_len > 0 && msdp->count < 910aa0a34beSHaiyang Zhang net_device->max_pkt; 911aa0a34beSHaiyang Zhang 912aa0a34beSHaiyang Zhang if (try_batch && msd_len + pktlen + net_device->pkt_align < 9137c3877f2SHaiyang Zhang net_device->send_section_size) { 9147c3877f2SHaiyang Zhang section_index = msdp->pkt->send_buf_index; 9157c3877f2SHaiyang Zhang 916aa0a34beSHaiyang Zhang } else if (try_batch && msd_len + packet->rmsg_size < 917aa0a34beSHaiyang Zhang net_device->send_section_size) { 918aa0a34beSHaiyang Zhang section_index = msdp->pkt->send_buf_index; 919aa0a34beSHaiyang Zhang packet->cp_partial = true; 920aa0a34beSHaiyang Zhang 921694a9fb0SKY Srinivasan } else if ((skb != NULL) && pktlen + net_device->pkt_align < 9227c3877f2SHaiyang Zhang net_device->send_section_size) { 9237c3877f2SHaiyang Zhang section_index = netvsc_get_next_send_section(net_device); 9247c3877f2SHaiyang Zhang if (section_index != NETVSC_INVALID_INDEX) { 925c85e4924SHaiyang Zhang move_pkt_msd(&msd_send, &msd_skb, msdp); 9267c3877f2SHaiyang Zhang msd_len = 0; 9277c3877f2SHaiyang Zhang } 9287c3877f2SHaiyang Zhang } 9297c3877f2SHaiyang Zhang 9307c3877f2SHaiyang Zhang if (section_index != NETVSC_INVALID_INDEX) { 9317c3877f2SHaiyang Zhang netvsc_copy_to_send_buf(net_device, 9327c3877f2SHaiyang Zhang section_index, msd_len, 933694a9fb0SKY Srinivasan packet, rndis_msg, pb, skb); 934b08cc791SKY Srinivasan 935aa0a34beSHaiyang Zhang packet->send_buf_index = section_index; 936aa0a34beSHaiyang Zhang 937aa0a34beSHaiyang Zhang if (packet->cp_partial) { 938aa0a34beSHaiyang Zhang packet->page_buf_cnt -= packet->rmsg_pgcnt; 939aa0a34beSHaiyang Zhang packet->total_data_buflen = msd_len + packet->rmsg_size; 940aa0a34beSHaiyang Zhang } else { 941aa0a34beSHaiyang Zhang packet->page_buf_cnt = 0; 942aa0a34beSHaiyang Zhang packet->total_data_buflen += msd_len; 943aa0a34beSHaiyang Zhang } 9447c3877f2SHaiyang Zhang 945c85e4924SHaiyang Zhang if (msdp->skb) 946c85e4924SHaiyang Zhang dev_kfree_skb_any(msdp->skb); 947ee90b812SHaiyang Zhang 948bde79be5SKY Srinivasan if (xmit_more && !packet->cp_partial) { 949c85e4924SHaiyang Zhang msdp->skb = skb; 9507c3877f2SHaiyang Zhang msdp->pkt = packet; 9517c3877f2SHaiyang Zhang msdp->count++; 9527c3877f2SHaiyang Zhang } else { 9537c3877f2SHaiyang Zhang cur_send = packet; 954c85e4924SHaiyang Zhang msdp->skb = NULL; 9557c3877f2SHaiyang Zhang msdp->pkt = NULL; 9567c3877f2SHaiyang Zhang msdp->count = 0; 9577c3877f2SHaiyang Zhang } 9587c3877f2SHaiyang Zhang } else { 959c85e4924SHaiyang Zhang move_pkt_msd(&msd_send, &msd_skb, msdp); 9607c3877f2SHaiyang Zhang cur_send = packet; 9617c3877f2SHaiyang Zhang } 9627c3877f2SHaiyang Zhang 9637c3877f2SHaiyang Zhang if (msd_send) { 9640a1275caSVitaly Kuznetsov m_ret = netvsc_send_pkt(device, msd_send, net_device, 9650a1275caSVitaly Kuznetsov NULL, msd_skb); 9667c3877f2SHaiyang Zhang 9677c3877f2SHaiyang Zhang if (m_ret != 0) { 9687c3877f2SHaiyang Zhang netvsc_free_send_slot(net_device, 9697c3877f2SHaiyang Zhang msd_send->send_buf_index); 970c85e4924SHaiyang Zhang dev_kfree_skb_any(msd_skb); 9717c3877f2SHaiyang Zhang } 9727c3877f2SHaiyang Zhang } 9737c3877f2SHaiyang Zhang 974cf8190e4SHaiyang Zhang send_now: 9757c3877f2SHaiyang Zhang if (cur_send) 9760a1275caSVitaly Kuznetsov ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb); 9777c3877f2SHaiyang Zhang 9787aab5159SJerry Snitselaar if (ret != 0 && section_index != NETVSC_INVALID_INDEX) 979d953ca4dSHaiyang Zhang netvsc_free_send_slot(net_device, section_index); 980d953ca4dSHaiyang Zhang 98195fa0405SHaiyang Zhang return ret; 98295fa0405SHaiyang Zhang } 98395fa0405SHaiyang Zhang 984c0b558e5SHaiyang Zhang static int netvsc_send_recv_completion(struct vmbus_channel *channel, 98563f6921dSHaiyang Zhang u64 transaction_id, u32 status) 98695fa0405SHaiyang Zhang { 98795fa0405SHaiyang Zhang struct nvsp_message recvcompMessage; 98895fa0405SHaiyang Zhang int ret; 98995fa0405SHaiyang Zhang 99095fa0405SHaiyang Zhang recvcompMessage.hdr.msg_type = 99195fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; 99295fa0405SHaiyang Zhang 99363f6921dSHaiyang Zhang recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status; 99495fa0405SHaiyang Zhang 99595fa0405SHaiyang Zhang /* Send the completion */ 9965b54dac8SHaiyang Zhang ret = vmbus_sendpacket(channel, &recvcompMessage, 997c0b558e5SHaiyang Zhang sizeof(struct nvsp_message_header) + sizeof(u32), 998c0b558e5SHaiyang Zhang transaction_id, VM_PKT_COMP, 0); 99995fa0405SHaiyang Zhang 1000c0b558e5SHaiyang Zhang return ret; 100195fa0405SHaiyang Zhang } 1002c0b558e5SHaiyang Zhang 1003c0b558e5SHaiyang Zhang static inline void count_recv_comp_slot(struct netvsc_device *nvdev, u16 q_idx, 1004c0b558e5SHaiyang Zhang u32 *filled, u32 *avail) 1005c0b558e5SHaiyang Zhang { 1006c0b558e5SHaiyang Zhang u32 first = nvdev->mrc[q_idx].first; 1007c0b558e5SHaiyang Zhang u32 next = nvdev->mrc[q_idx].next; 1008c0b558e5SHaiyang Zhang 1009c0b558e5SHaiyang Zhang *filled = (first > next) ? NETVSC_RECVSLOT_MAX - first + next : 1010c0b558e5SHaiyang Zhang next - first; 1011c0b558e5SHaiyang Zhang 1012c0b558e5SHaiyang Zhang *avail = NETVSC_RECVSLOT_MAX - *filled - 1; 101395fa0405SHaiyang Zhang } 1014c0b558e5SHaiyang Zhang 1015c0b558e5SHaiyang Zhang /* Read the first filled slot, no change to index */ 1016c0b558e5SHaiyang Zhang static inline struct recv_comp_data *read_recv_comp_slot(struct netvsc_device 1017c0b558e5SHaiyang Zhang *nvdev, u16 q_idx) 1018c0b558e5SHaiyang Zhang { 1019c0b558e5SHaiyang Zhang u32 filled, avail; 1020c0b558e5SHaiyang Zhang 1021c0b558e5SHaiyang Zhang if (!nvdev->mrc[q_idx].buf) 1022c0b558e5SHaiyang Zhang return NULL; 1023c0b558e5SHaiyang Zhang 1024c0b558e5SHaiyang Zhang count_recv_comp_slot(nvdev, q_idx, &filled, &avail); 1025c0b558e5SHaiyang Zhang if (!filled) 1026c0b558e5SHaiyang Zhang return NULL; 1027c0b558e5SHaiyang Zhang 1028c0b558e5SHaiyang Zhang return nvdev->mrc[q_idx].buf + nvdev->mrc[q_idx].first * 1029c0b558e5SHaiyang Zhang sizeof(struct recv_comp_data); 1030c0b558e5SHaiyang Zhang } 1031c0b558e5SHaiyang Zhang 1032c0b558e5SHaiyang Zhang /* Put the first filled slot back to available pool */ 1033c0b558e5SHaiyang Zhang static inline void put_recv_comp_slot(struct netvsc_device *nvdev, u16 q_idx) 1034c0b558e5SHaiyang Zhang { 1035c0b558e5SHaiyang Zhang int num_recv; 1036c0b558e5SHaiyang Zhang 1037c0b558e5SHaiyang Zhang nvdev->mrc[q_idx].first = (nvdev->mrc[q_idx].first + 1) % 1038c0b558e5SHaiyang Zhang NETVSC_RECVSLOT_MAX; 1039c0b558e5SHaiyang Zhang 1040c0b558e5SHaiyang Zhang num_recv = atomic_dec_return(&nvdev->num_outstanding_recvs); 1041c0b558e5SHaiyang Zhang 1042c0b558e5SHaiyang Zhang if (nvdev->destroy && num_recv == 0) 1043c0b558e5SHaiyang Zhang wake_up(&nvdev->wait_drain); 1044c0b558e5SHaiyang Zhang } 1045c0b558e5SHaiyang Zhang 1046c0b558e5SHaiyang Zhang /* Check and send pending recv completions */ 1047c0b558e5SHaiyang Zhang static void netvsc_chk_recv_comp(struct netvsc_device *nvdev, 1048c0b558e5SHaiyang Zhang struct vmbus_channel *channel, u16 q_idx) 1049c0b558e5SHaiyang Zhang { 1050c0b558e5SHaiyang Zhang struct recv_comp_data *rcd; 1051c0b558e5SHaiyang Zhang int ret; 1052c0b558e5SHaiyang Zhang 1053c0b558e5SHaiyang Zhang while (true) { 1054c0b558e5SHaiyang Zhang rcd = read_recv_comp_slot(nvdev, q_idx); 1055c0b558e5SHaiyang Zhang if (!rcd) 1056c0b558e5SHaiyang Zhang break; 1057c0b558e5SHaiyang Zhang 1058c0b558e5SHaiyang Zhang ret = netvsc_send_recv_completion(channel, rcd->tid, 1059c0b558e5SHaiyang Zhang rcd->status); 1060c0b558e5SHaiyang Zhang if (ret) 1061c0b558e5SHaiyang Zhang break; 1062c0b558e5SHaiyang Zhang 1063c0b558e5SHaiyang Zhang put_recv_comp_slot(nvdev, q_idx); 1064c0b558e5SHaiyang Zhang } 1065c0b558e5SHaiyang Zhang } 1066c0b558e5SHaiyang Zhang 1067c0b558e5SHaiyang Zhang #define NETVSC_RCD_WATERMARK 80 1068c0b558e5SHaiyang Zhang 1069c0b558e5SHaiyang Zhang /* Get next available slot */ 1070c0b558e5SHaiyang Zhang static inline struct recv_comp_data *get_recv_comp_slot( 1071c0b558e5SHaiyang Zhang struct netvsc_device *nvdev, struct vmbus_channel *channel, u16 q_idx) 1072c0b558e5SHaiyang Zhang { 1073c0b558e5SHaiyang Zhang u32 filled, avail, next; 1074c0b558e5SHaiyang Zhang struct recv_comp_data *rcd; 1075c0b558e5SHaiyang Zhang 1076c0b558e5SHaiyang Zhang if (!nvdev->recv_section) 1077c0b558e5SHaiyang Zhang return NULL; 1078c0b558e5SHaiyang Zhang 1079c0b558e5SHaiyang Zhang if (!nvdev->mrc[q_idx].buf) 1080c0b558e5SHaiyang Zhang return NULL; 1081c0b558e5SHaiyang Zhang 1082c0b558e5SHaiyang Zhang if (atomic_read(&nvdev->num_outstanding_recvs) > 1083c0b558e5SHaiyang Zhang nvdev->recv_section->num_sub_allocs * NETVSC_RCD_WATERMARK / 100) 1084c0b558e5SHaiyang Zhang netvsc_chk_recv_comp(nvdev, channel, q_idx); 1085c0b558e5SHaiyang Zhang 1086c0b558e5SHaiyang Zhang count_recv_comp_slot(nvdev, q_idx, &filled, &avail); 1087c0b558e5SHaiyang Zhang if (!avail) 1088c0b558e5SHaiyang Zhang return NULL; 1089c0b558e5SHaiyang Zhang 1090c0b558e5SHaiyang Zhang next = nvdev->mrc[q_idx].next; 1091c0b558e5SHaiyang Zhang rcd = nvdev->mrc[q_idx].buf + next * sizeof(struct recv_comp_data); 1092c0b558e5SHaiyang Zhang nvdev->mrc[q_idx].next = (next + 1) % NETVSC_RECVSLOT_MAX; 1093c0b558e5SHaiyang Zhang 1094c0b558e5SHaiyang Zhang atomic_inc(&nvdev->num_outstanding_recvs); 1095c0b558e5SHaiyang Zhang 1096c0b558e5SHaiyang Zhang return rcd; 109795fa0405SHaiyang Zhang } 109895fa0405SHaiyang Zhang 109997c1723aSKY Srinivasan static void netvsc_receive(struct netvsc_device *net_device, 11005b54dac8SHaiyang Zhang struct vmbus_channel *channel, 110197c1723aSKY Srinivasan struct hv_device *device, 110295fa0405SHaiyang Zhang struct vmpacket_descriptor *packet) 110395fa0405SHaiyang Zhang { 110495fa0405SHaiyang Zhang struct vmtransfer_page_packet_header *vmxferpage_packet; 110595fa0405SHaiyang Zhang struct nvsp_message *nvsp_packet; 11064baab261SHaiyang Zhang struct hv_netvsc_packet nv_pkt; 11074baab261SHaiyang Zhang struct hv_netvsc_packet *netvsc_packet = &nv_pkt; 11084baab261SHaiyang Zhang u32 status = NVSP_STAT_SUCCESS; 110945326342SHaiyang Zhang int i; 111045326342SHaiyang Zhang int count = 0; 11110a1275caSVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 1112c4b20c63SKY Srinivasan void *data; 1113c0b558e5SHaiyang Zhang int ret; 1114c0b558e5SHaiyang Zhang struct recv_comp_data *rcd; 1115c0b558e5SHaiyang Zhang u16 q_idx = channel->offermsg.offer.sub_channel_index; 111695fa0405SHaiyang Zhang 111795fa0405SHaiyang Zhang /* 111895fa0405SHaiyang Zhang * All inbound packets other than send completion should be xfer page 111995fa0405SHaiyang Zhang * packet 112095fa0405SHaiyang Zhang */ 112195fa0405SHaiyang Zhang if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { 112295fa0405SHaiyang Zhang netdev_err(ndev, "Unknown packet type received - %d\n", 112395fa0405SHaiyang Zhang packet->type); 112495fa0405SHaiyang Zhang return; 112595fa0405SHaiyang Zhang } 112695fa0405SHaiyang Zhang 112795fa0405SHaiyang Zhang nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 112895fa0405SHaiyang Zhang (packet->offset8 << 3)); 112995fa0405SHaiyang Zhang 113095fa0405SHaiyang Zhang /* Make sure this is a valid nvsp packet */ 113195fa0405SHaiyang Zhang if (nvsp_packet->hdr.msg_type != 113295fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RNDIS_PKT) { 113395fa0405SHaiyang Zhang netdev_err(ndev, "Unknown nvsp packet type received-" 113495fa0405SHaiyang Zhang " %d\n", nvsp_packet->hdr.msg_type); 113595fa0405SHaiyang Zhang return; 113695fa0405SHaiyang Zhang } 113795fa0405SHaiyang Zhang 113895fa0405SHaiyang Zhang vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; 113995fa0405SHaiyang Zhang 114095fa0405SHaiyang Zhang if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { 114195fa0405SHaiyang Zhang netdev_err(ndev, "Invalid xfer page set id - " 114295fa0405SHaiyang Zhang "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID, 114395fa0405SHaiyang Zhang vmxferpage_packet->xfer_pageset_id); 114495fa0405SHaiyang Zhang return; 114595fa0405SHaiyang Zhang } 114695fa0405SHaiyang Zhang 11474baab261SHaiyang Zhang count = vmxferpage_packet->range_cnt; 114895fa0405SHaiyang Zhang 114995fa0405SHaiyang Zhang /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ 11504baab261SHaiyang Zhang for (i = 0; i < count; i++) { 115195fa0405SHaiyang Zhang /* Initialize the netvsc packet */ 1152c4b20c63SKY Srinivasan data = (void *)((unsigned long)net_device-> 115345326342SHaiyang Zhang recv_buf + vmxferpage_packet->ranges[i].byte_offset); 115495fa0405SHaiyang Zhang netvsc_packet->total_data_buflen = 115595fa0405SHaiyang Zhang vmxferpage_packet->ranges[i].byte_count; 115695fa0405SHaiyang Zhang 115795fa0405SHaiyang Zhang /* Pass it to the upper layer */ 115810082f98SKY Srinivasan status = rndis_filter_receive(device, netvsc_packet, &data, 115910082f98SKY Srinivasan channel); 116095fa0405SHaiyang Zhang 116195fa0405SHaiyang Zhang } 116295fa0405SHaiyang Zhang 1163c0b558e5SHaiyang Zhang if (!net_device->mrc[q_idx].buf) { 1164c0b558e5SHaiyang Zhang ret = netvsc_send_recv_completion(channel, 1165c0b558e5SHaiyang Zhang vmxferpage_packet->d.trans_id, 1166c0b558e5SHaiyang Zhang status); 1167c0b558e5SHaiyang Zhang if (ret) 1168c0b558e5SHaiyang Zhang netdev_err(ndev, "Recv_comp q:%hd, tid:%llx, err:%d\n", 1169c0b558e5SHaiyang Zhang q_idx, vmxferpage_packet->d.trans_id, ret); 1170c0b558e5SHaiyang Zhang return; 1171c0b558e5SHaiyang Zhang } 1172c0b558e5SHaiyang Zhang 1173c0b558e5SHaiyang Zhang rcd = get_recv_comp_slot(net_device, channel, q_idx); 1174c0b558e5SHaiyang Zhang 1175c0b558e5SHaiyang Zhang if (!rcd) { 1176c0b558e5SHaiyang Zhang netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n", 1177c0b558e5SHaiyang Zhang q_idx, vmxferpage_packet->d.trans_id); 1178c0b558e5SHaiyang Zhang return; 1179c0b558e5SHaiyang Zhang } 1180c0b558e5SHaiyang Zhang 1181c0b558e5SHaiyang Zhang rcd->tid = vmxferpage_packet->d.trans_id; 1182c0b558e5SHaiyang Zhang rcd->status = status; 118395fa0405SHaiyang Zhang } 118495fa0405SHaiyang Zhang 11855b54dac8SHaiyang Zhang 11865b54dac8SHaiyang Zhang static void netvsc_send_table(struct hv_device *hdev, 118771790a27SHaiyang Zhang struct nvsp_message *nvmsg) 11885b54dac8SHaiyang Zhang { 11895b54dac8SHaiyang Zhang struct netvsc_device *nvscdev; 11900a1275caSVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(hdev); 11915b54dac8SHaiyang Zhang int i; 11925b54dac8SHaiyang Zhang u32 count, *tab; 11935b54dac8SHaiyang Zhang 11945b54dac8SHaiyang Zhang nvscdev = get_outbound_net_device(hdev); 11955b54dac8SHaiyang Zhang if (!nvscdev) 11965b54dac8SHaiyang Zhang return; 11975b54dac8SHaiyang Zhang 11985b54dac8SHaiyang Zhang count = nvmsg->msg.v5_msg.send_table.count; 11995b54dac8SHaiyang Zhang if (count != VRSS_SEND_TAB_SIZE) { 12005b54dac8SHaiyang Zhang netdev_err(ndev, "Received wrong send-table size:%u\n", count); 12015b54dac8SHaiyang Zhang return; 12025b54dac8SHaiyang Zhang } 12035b54dac8SHaiyang Zhang 12045b54dac8SHaiyang Zhang tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table + 12055b54dac8SHaiyang Zhang nvmsg->msg.v5_msg.send_table.offset); 12065b54dac8SHaiyang Zhang 12075b54dac8SHaiyang Zhang for (i = 0; i < count; i++) 12085b54dac8SHaiyang Zhang nvscdev->send_table[i] = tab[i]; 12095b54dac8SHaiyang Zhang } 12105b54dac8SHaiyang Zhang 1211f9a7da91SVitaly Kuznetsov static void netvsc_send_vf(struct net_device_context *net_device_ctx, 121271790a27SHaiyang Zhang struct nvsp_message *nvmsg) 121371790a27SHaiyang Zhang { 1214f9a7da91SVitaly Kuznetsov net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated; 1215f9a7da91SVitaly Kuznetsov net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial; 121671790a27SHaiyang Zhang } 121771790a27SHaiyang Zhang 121871790a27SHaiyang Zhang static inline void netvsc_receive_inband(struct hv_device *hdev, 1219f9a7da91SVitaly Kuznetsov struct net_device_context *net_device_ctx, 122071790a27SHaiyang Zhang struct nvsp_message *nvmsg) 122171790a27SHaiyang Zhang { 122271790a27SHaiyang Zhang switch (nvmsg->hdr.msg_type) { 122371790a27SHaiyang Zhang case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE: 122471790a27SHaiyang Zhang netvsc_send_table(hdev, nvmsg); 122571790a27SHaiyang Zhang break; 122671790a27SHaiyang Zhang 122771790a27SHaiyang Zhang case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION: 1228f9a7da91SVitaly Kuznetsov netvsc_send_vf(net_device_ctx, nvmsg); 122971790a27SHaiyang Zhang break; 123071790a27SHaiyang Zhang } 123171790a27SHaiyang Zhang } 123271790a27SHaiyang Zhang 123399a50bb1SK. Y. Srinivasan static void netvsc_process_raw_pkt(struct hv_device *device, 123499a50bb1SK. Y. Srinivasan struct vmbus_channel *channel, 123599a50bb1SK. Y. Srinivasan struct netvsc_device *net_device, 123699a50bb1SK. Y. Srinivasan struct net_device *ndev, 123799a50bb1SK. Y. Srinivasan u64 request_id, 123899a50bb1SK. Y. Srinivasan struct vmpacket_descriptor *desc) 123999a50bb1SK. Y. Srinivasan { 124099a50bb1SK. Y. Srinivasan struct nvsp_message *nvmsg; 1241f9a7da91SVitaly Kuznetsov struct net_device_context *net_device_ctx = netdev_priv(ndev); 124299a50bb1SK. Y. Srinivasan 124399a50bb1SK. Y. Srinivasan nvmsg = (struct nvsp_message *)((unsigned long) 124499a50bb1SK. Y. Srinivasan desc + (desc->offset8 << 3)); 124599a50bb1SK. Y. Srinivasan 124699a50bb1SK. Y. Srinivasan switch (desc->type) { 124799a50bb1SK. Y. Srinivasan case VM_PKT_COMP: 124899a50bb1SK. Y. Srinivasan netvsc_send_completion(net_device, channel, device, desc); 124999a50bb1SK. Y. Srinivasan break; 125099a50bb1SK. Y. Srinivasan 125199a50bb1SK. Y. Srinivasan case VM_PKT_DATA_USING_XFER_PAGES: 125299a50bb1SK. Y. Srinivasan netvsc_receive(net_device, channel, device, desc); 125399a50bb1SK. Y. Srinivasan break; 125499a50bb1SK. Y. Srinivasan 125599a50bb1SK. Y. Srinivasan case VM_PKT_DATA_INBAND: 1256f9a7da91SVitaly Kuznetsov netvsc_receive_inband(device, net_device_ctx, nvmsg); 125799a50bb1SK. Y. Srinivasan break; 125899a50bb1SK. Y. Srinivasan 125999a50bb1SK. Y. Srinivasan default: 126099a50bb1SK. Y. Srinivasan netdev_err(ndev, "unhandled packet type %d, tid %llx\n", 126199a50bb1SK. Y. Srinivasan desc->type, request_id); 126299a50bb1SK. Y. Srinivasan break; 126399a50bb1SK. Y. Srinivasan } 126499a50bb1SK. Y. Srinivasan } 126599a50bb1SK. Y. Srinivasan 126699a50bb1SK. Y. Srinivasan 12675b54dac8SHaiyang Zhang void netvsc_channel_cb(void *context) 126895fa0405SHaiyang Zhang { 126995fa0405SHaiyang Zhang int ret; 12705b54dac8SHaiyang Zhang struct vmbus_channel *channel = (struct vmbus_channel *)context; 1271c0b558e5SHaiyang Zhang u16 q_idx = channel->offermsg.offer.sub_channel_index; 12725b54dac8SHaiyang Zhang struct hv_device *device; 127395fa0405SHaiyang Zhang struct netvsc_device *net_device; 127495fa0405SHaiyang Zhang u32 bytes_recvd; 127595fa0405SHaiyang Zhang u64 request_id; 127695fa0405SHaiyang Zhang struct vmpacket_descriptor *desc; 127795fa0405SHaiyang Zhang unsigned char *buffer; 127895fa0405SHaiyang Zhang int bufferlen = NETVSC_PACKET_SIZE; 127995fa0405SHaiyang Zhang struct net_device *ndev; 128099a50bb1SK. Y. Srinivasan bool need_to_commit = false; 128195fa0405SHaiyang Zhang 12825b54dac8SHaiyang Zhang if (channel->primary_channel != NULL) 12835b54dac8SHaiyang Zhang device = channel->primary_channel->device_obj; 12845b54dac8SHaiyang Zhang else 12855b54dac8SHaiyang Zhang device = channel->device_obj; 12865b54dac8SHaiyang Zhang 128795fa0405SHaiyang Zhang net_device = get_inbound_net_device(device); 128895fa0405SHaiyang Zhang if (!net_device) 1289ee0c4c39SKY Srinivasan return; 12900a1275caSVitaly Kuznetsov ndev = hv_get_drvdata(device); 12915b54dac8SHaiyang Zhang buffer = get_per_channel_state(channel); 129295fa0405SHaiyang Zhang 129395fa0405SHaiyang Zhang do { 129499a50bb1SK. Y. Srinivasan desc = get_next_pkt_raw(channel); 129599a50bb1SK. Y. Srinivasan if (desc != NULL) { 129699a50bb1SK. Y. Srinivasan netvsc_process_raw_pkt(device, 129799a50bb1SK. Y. Srinivasan channel, 129899a50bb1SK. Y. Srinivasan net_device, 129999a50bb1SK. Y. Srinivasan ndev, 130099a50bb1SK. Y. Srinivasan desc->trans_id, 130199a50bb1SK. Y. Srinivasan desc); 130299a50bb1SK. Y. Srinivasan 130399a50bb1SK. Y. Srinivasan put_pkt_raw(channel, desc); 130499a50bb1SK. Y. Srinivasan need_to_commit = true; 130599a50bb1SK. Y. Srinivasan continue; 130699a50bb1SK. Y. Srinivasan } 130799a50bb1SK. Y. Srinivasan if (need_to_commit) { 130899a50bb1SK. Y. Srinivasan need_to_commit = false; 130999a50bb1SK. Y. Srinivasan commit_rd_index(channel); 131099a50bb1SK. Y. Srinivasan } 131199a50bb1SK. Y. Srinivasan 13125b54dac8SHaiyang Zhang ret = vmbus_recvpacket_raw(channel, buffer, bufferlen, 131395fa0405SHaiyang Zhang &bytes_recvd, &request_id); 131495fa0405SHaiyang Zhang if (ret == 0) { 131595fa0405SHaiyang Zhang if (bytes_recvd > 0) { 131695fa0405SHaiyang Zhang desc = (struct vmpacket_descriptor *)buffer; 131799a50bb1SK. Y. Srinivasan netvsc_process_raw_pkt(device, 131825b85ee8SKY Srinivasan channel, 131971790a27SHaiyang Zhang net_device, 132099a50bb1SK. Y. Srinivasan ndev, 132199a50bb1SK. Y. Srinivasan request_id, 132299a50bb1SK. Y. Srinivasan desc); 13235b54dac8SHaiyang Zhang 132495fa0405SHaiyang Zhang 132595fa0405SHaiyang Zhang } else { 1326ee0c4c39SKY Srinivasan /* 1327ee0c4c39SKY Srinivasan * We are done for this pass. 1328ee0c4c39SKY Srinivasan */ 132995fa0405SHaiyang Zhang break; 133095fa0405SHaiyang Zhang } 1331ee0c4c39SKY Srinivasan 133295fa0405SHaiyang Zhang } else if (ret == -ENOBUFS) { 1333ee0c4c39SKY Srinivasan if (bufferlen > NETVSC_PACKET_SIZE) 1334ee0c4c39SKY Srinivasan kfree(buffer); 133595fa0405SHaiyang Zhang /* Handle large packet */ 133695fa0405SHaiyang Zhang buffer = kmalloc(bytes_recvd, GFP_ATOMIC); 133795fa0405SHaiyang Zhang if (buffer == NULL) { 133895fa0405SHaiyang Zhang /* Try again next time around */ 133995fa0405SHaiyang Zhang netdev_err(ndev, 134095fa0405SHaiyang Zhang "unable to allocate buffer of size " 134195fa0405SHaiyang Zhang "(%d)!!\n", bytes_recvd); 134295fa0405SHaiyang Zhang break; 134395fa0405SHaiyang Zhang } 134495fa0405SHaiyang Zhang 134595fa0405SHaiyang Zhang bufferlen = bytes_recvd; 134695fa0405SHaiyang Zhang } 134795fa0405SHaiyang Zhang } while (1); 134895fa0405SHaiyang Zhang 1349ee0c4c39SKY Srinivasan if (bufferlen > NETVSC_PACKET_SIZE) 135095fa0405SHaiyang Zhang kfree(buffer); 1351c0b558e5SHaiyang Zhang 1352c0b558e5SHaiyang Zhang netvsc_chk_recv_comp(net_device, channel, q_idx); 1353c0b558e5SHaiyang Zhang 135495fa0405SHaiyang Zhang return; 135595fa0405SHaiyang Zhang } 135695fa0405SHaiyang Zhang 135795fa0405SHaiyang Zhang /* 135895fa0405SHaiyang Zhang * netvsc_device_add - Callback when the device belonging to this 135995fa0405SHaiyang Zhang * driver is added 136095fa0405SHaiyang Zhang */ 136195fa0405SHaiyang Zhang int netvsc_device_add(struct hv_device *device, void *additional_info) 136295fa0405SHaiyang Zhang { 136388098834SVitaly Kuznetsov int i, ret = 0; 136495fa0405SHaiyang Zhang int ring_size = 136595fa0405SHaiyang Zhang ((struct netvsc_device_info *)additional_info)->ring_size; 136695fa0405SHaiyang Zhang struct netvsc_device *net_device; 136788098834SVitaly Kuznetsov struct net_device *ndev = hv_get_drvdata(device); 136888098834SVitaly Kuznetsov struct net_device_context *net_device_ctx = netdev_priv(ndev); 136995fa0405SHaiyang Zhang 137088098834SVitaly Kuznetsov net_device = alloc_net_device(); 1371b1c84927SDan Carpenter if (!net_device) 1372b1c84927SDan Carpenter return -ENOMEM; 137395fa0405SHaiyang Zhang 13745b54dac8SHaiyang Zhang net_device->ring_size = ring_size; 13755b54dac8SHaiyang Zhang 137695fa0405SHaiyang Zhang /* Initialize the NetVSC channel extension */ 137795fa0405SHaiyang Zhang init_completion(&net_device->channel_init_wait); 137895fa0405SHaiyang Zhang 13795b54dac8SHaiyang Zhang set_per_channel_state(device->channel, net_device->cb_buffer); 13805b54dac8SHaiyang Zhang 138195fa0405SHaiyang Zhang /* Open the channel */ 138295fa0405SHaiyang Zhang ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, 138395fa0405SHaiyang Zhang ring_size * PAGE_SIZE, NULL, 0, 13845b54dac8SHaiyang Zhang netvsc_channel_cb, device->channel); 138595fa0405SHaiyang Zhang 138695fa0405SHaiyang Zhang if (ret != 0) { 138795fa0405SHaiyang Zhang netdev_err(ndev, "unable to open channel: %d\n", ret); 138895fa0405SHaiyang Zhang goto cleanup; 138995fa0405SHaiyang Zhang } 139095fa0405SHaiyang Zhang 139195fa0405SHaiyang Zhang /* Channel is opened */ 139295fa0405SHaiyang Zhang pr_info("hv_netvsc channel opened successfully\n"); 139395fa0405SHaiyang Zhang 139488098834SVitaly Kuznetsov /* If we're reopening the device we may have multiple queues, fill the 139588098834SVitaly Kuznetsov * chn_table with the default channel to use it before subchannels are 139688098834SVitaly Kuznetsov * opened. 139788098834SVitaly Kuznetsov */ 139888098834SVitaly Kuznetsov for (i = 0; i < VRSS_CHANNEL_MAX; i++) 139988098834SVitaly Kuznetsov net_device->chn_table[i] = device->channel; 140088098834SVitaly Kuznetsov 140188098834SVitaly Kuznetsov /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is 140288098834SVitaly Kuznetsov * populated. 140388098834SVitaly Kuznetsov */ 140488098834SVitaly Kuznetsov wmb(); 140588098834SVitaly Kuznetsov 140688098834SVitaly Kuznetsov net_device_ctx->nvdev = net_device; 14075b54dac8SHaiyang Zhang 140895fa0405SHaiyang Zhang /* Connect with the NetVsp */ 140995fa0405SHaiyang Zhang ret = netvsc_connect_vsp(device); 141095fa0405SHaiyang Zhang if (ret != 0) { 141195fa0405SHaiyang Zhang netdev_err(ndev, 141295fa0405SHaiyang Zhang "unable to connect to NetVSP - %d\n", ret); 141395fa0405SHaiyang Zhang goto close; 141495fa0405SHaiyang Zhang } 141595fa0405SHaiyang Zhang 141695fa0405SHaiyang Zhang return ret; 141795fa0405SHaiyang Zhang 141895fa0405SHaiyang Zhang close: 141995fa0405SHaiyang Zhang /* Now, we can close the channel safely */ 142095fa0405SHaiyang Zhang vmbus_close(device->channel); 142195fa0405SHaiyang Zhang 142295fa0405SHaiyang Zhang cleanup: 1423f90251c8SHaiyang Zhang free_netvsc_device(net_device); 142495fa0405SHaiyang Zhang 142595fa0405SHaiyang Zhang return ret; 142695fa0405SHaiyang Zhang } 1427