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 1495fa0405SHaiyang Zhang * this program; if not, write to the Free Software Foundation, Inc., 59 Temple 1595fa0405SHaiyang Zhang * Place - Suite 330, Boston, MA 02111-1307 USA. 1695fa0405SHaiyang Zhang * 1795fa0405SHaiyang Zhang * Authors: 1895fa0405SHaiyang Zhang * Haiyang Zhang <haiyangz@microsoft.com> 1995fa0405SHaiyang Zhang * Hank Janssen <hjanssen@microsoft.com> 2095fa0405SHaiyang Zhang */ 2195fa0405SHaiyang Zhang #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 2295fa0405SHaiyang Zhang 2395fa0405SHaiyang Zhang #include <linux/kernel.h> 2495fa0405SHaiyang Zhang #include <linux/sched.h> 2595fa0405SHaiyang Zhang #include <linux/wait.h> 2695fa0405SHaiyang Zhang #include <linux/mm.h> 2795fa0405SHaiyang Zhang #include <linux/delay.h> 2895fa0405SHaiyang Zhang #include <linux/io.h> 2995fa0405SHaiyang Zhang #include <linux/slab.h> 3095fa0405SHaiyang Zhang #include <linux/netdevice.h> 31f157e78dSHaiyang Zhang #include <linux/if_ether.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); 4095fa0405SHaiyang Zhang 4195fa0405SHaiyang Zhang net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); 4295fa0405SHaiyang Zhang if (!net_device) 4395fa0405SHaiyang Zhang return NULL; 4495fa0405SHaiyang Zhang 45dc5cd894SHaiyang Zhang init_waitqueue_head(&net_device->wait_drain); 464d447c9aSHaiyang Zhang net_device->start_remove = false; 4795fa0405SHaiyang Zhang net_device->destroy = false; 4895fa0405SHaiyang Zhang net_device->dev = device; 4995fa0405SHaiyang Zhang net_device->ndev = ndev; 5095fa0405SHaiyang Zhang 5195fa0405SHaiyang Zhang hv_set_drvdata(device, net_device); 5295fa0405SHaiyang Zhang return net_device; 5395fa0405SHaiyang Zhang } 5495fa0405SHaiyang Zhang 5595fa0405SHaiyang Zhang static struct netvsc_device *get_outbound_net_device(struct hv_device *device) 5695fa0405SHaiyang Zhang { 5795fa0405SHaiyang Zhang struct netvsc_device *net_device; 5895fa0405SHaiyang Zhang 5995fa0405SHaiyang Zhang net_device = hv_get_drvdata(device); 6095fa0405SHaiyang Zhang if (net_device && net_device->destroy) 6195fa0405SHaiyang Zhang net_device = NULL; 6295fa0405SHaiyang Zhang 6395fa0405SHaiyang Zhang return net_device; 6495fa0405SHaiyang Zhang } 6595fa0405SHaiyang Zhang 6695fa0405SHaiyang Zhang static struct netvsc_device *get_inbound_net_device(struct hv_device *device) 6795fa0405SHaiyang Zhang { 6895fa0405SHaiyang Zhang struct netvsc_device *net_device; 6995fa0405SHaiyang Zhang 7095fa0405SHaiyang Zhang net_device = hv_get_drvdata(device); 7195fa0405SHaiyang Zhang 7295fa0405SHaiyang Zhang if (!net_device) 7395fa0405SHaiyang Zhang goto get_in_err; 7495fa0405SHaiyang Zhang 7595fa0405SHaiyang Zhang if (net_device->destroy && 7695fa0405SHaiyang Zhang atomic_read(&net_device->num_outstanding_sends) == 0) 7795fa0405SHaiyang Zhang net_device = NULL; 7895fa0405SHaiyang Zhang 7995fa0405SHaiyang Zhang get_in_err: 8095fa0405SHaiyang Zhang return net_device; 8195fa0405SHaiyang Zhang } 8295fa0405SHaiyang Zhang 8395fa0405SHaiyang Zhang 8495fa0405SHaiyang Zhang static int netvsc_destroy_recv_buf(struct netvsc_device *net_device) 8595fa0405SHaiyang Zhang { 8695fa0405SHaiyang Zhang struct nvsp_message *revoke_packet; 8795fa0405SHaiyang Zhang int ret = 0; 8895fa0405SHaiyang Zhang struct net_device *ndev = net_device->ndev; 8995fa0405SHaiyang Zhang 9095fa0405SHaiyang Zhang /* 9195fa0405SHaiyang Zhang * If we got a section count, it means we received a 9295fa0405SHaiyang Zhang * SendReceiveBufferComplete msg (ie sent 9395fa0405SHaiyang Zhang * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need 9495fa0405SHaiyang Zhang * to send a revoke msg here 9595fa0405SHaiyang Zhang */ 9695fa0405SHaiyang Zhang if (net_device->recv_section_cnt) { 9795fa0405SHaiyang Zhang /* Send the revoke receive buffer */ 9895fa0405SHaiyang Zhang revoke_packet = &net_device->revoke_packet; 9995fa0405SHaiyang Zhang memset(revoke_packet, 0, sizeof(struct nvsp_message)); 10095fa0405SHaiyang Zhang 10195fa0405SHaiyang Zhang revoke_packet->hdr.msg_type = 10295fa0405SHaiyang Zhang NVSP_MSG1_TYPE_REVOKE_RECV_BUF; 10395fa0405SHaiyang Zhang revoke_packet->msg.v1_msg. 10495fa0405SHaiyang Zhang revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 10595fa0405SHaiyang Zhang 10695fa0405SHaiyang Zhang ret = vmbus_sendpacket(net_device->dev->channel, 10795fa0405SHaiyang Zhang revoke_packet, 10895fa0405SHaiyang Zhang sizeof(struct nvsp_message), 10995fa0405SHaiyang Zhang (unsigned long)revoke_packet, 11095fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 0); 11195fa0405SHaiyang Zhang /* 11295fa0405SHaiyang Zhang * If we failed here, we might as well return and 11395fa0405SHaiyang Zhang * have a leak rather than continue and a bugchk 11495fa0405SHaiyang Zhang */ 11595fa0405SHaiyang Zhang if (ret != 0) { 11695fa0405SHaiyang Zhang netdev_err(ndev, "unable to send " 11795fa0405SHaiyang Zhang "revoke receive buffer to netvsp\n"); 11895fa0405SHaiyang Zhang return ret; 11995fa0405SHaiyang Zhang } 12095fa0405SHaiyang Zhang } 12195fa0405SHaiyang Zhang 12295fa0405SHaiyang Zhang /* Teardown the gpadl on the vsp end */ 12395fa0405SHaiyang Zhang if (net_device->recv_buf_gpadl_handle) { 12495fa0405SHaiyang Zhang ret = vmbus_teardown_gpadl(net_device->dev->channel, 12595fa0405SHaiyang Zhang net_device->recv_buf_gpadl_handle); 12695fa0405SHaiyang Zhang 12795fa0405SHaiyang Zhang /* If we failed here, we might as well return and have a leak 12895fa0405SHaiyang Zhang * rather than continue and a bugchk 12995fa0405SHaiyang Zhang */ 13095fa0405SHaiyang Zhang if (ret != 0) { 13195fa0405SHaiyang Zhang netdev_err(ndev, 13295fa0405SHaiyang Zhang "unable to teardown receive buffer's gpadl\n"); 13395fa0405SHaiyang Zhang return ret; 13495fa0405SHaiyang Zhang } 13595fa0405SHaiyang Zhang net_device->recv_buf_gpadl_handle = 0; 13695fa0405SHaiyang Zhang } 13795fa0405SHaiyang Zhang 13895fa0405SHaiyang Zhang if (net_device->recv_buf) { 13995fa0405SHaiyang Zhang /* Free up the receive buffer */ 14095fa0405SHaiyang Zhang free_pages((unsigned long)net_device->recv_buf, 14195fa0405SHaiyang Zhang get_order(net_device->recv_buf_size)); 14295fa0405SHaiyang Zhang net_device->recv_buf = NULL; 14395fa0405SHaiyang Zhang } 14495fa0405SHaiyang Zhang 14595fa0405SHaiyang Zhang if (net_device->recv_section) { 14695fa0405SHaiyang Zhang net_device->recv_section_cnt = 0; 14795fa0405SHaiyang Zhang kfree(net_device->recv_section); 14895fa0405SHaiyang Zhang net_device->recv_section = NULL; 14995fa0405SHaiyang Zhang } 15095fa0405SHaiyang Zhang 15195fa0405SHaiyang Zhang return ret; 15295fa0405SHaiyang Zhang } 15395fa0405SHaiyang Zhang 15495fa0405SHaiyang Zhang static int netvsc_init_recv_buf(struct hv_device *device) 15595fa0405SHaiyang Zhang { 15695fa0405SHaiyang Zhang int ret = 0; 15795fa0405SHaiyang Zhang int t; 15895fa0405SHaiyang Zhang struct netvsc_device *net_device; 15995fa0405SHaiyang Zhang struct nvsp_message *init_packet; 16095fa0405SHaiyang Zhang struct net_device *ndev; 16195fa0405SHaiyang Zhang 16295fa0405SHaiyang Zhang net_device = get_outbound_net_device(device); 16395fa0405SHaiyang Zhang if (!net_device) 16495fa0405SHaiyang Zhang return -ENODEV; 16595fa0405SHaiyang Zhang ndev = net_device->ndev; 16695fa0405SHaiyang Zhang 16795fa0405SHaiyang Zhang net_device->recv_buf = 16895fa0405SHaiyang Zhang (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, 16995fa0405SHaiyang Zhang get_order(net_device->recv_buf_size)); 17095fa0405SHaiyang Zhang if (!net_device->recv_buf) { 17195fa0405SHaiyang Zhang netdev_err(ndev, "unable to allocate receive " 17295fa0405SHaiyang Zhang "buffer of size %d\n", net_device->recv_buf_size); 17395fa0405SHaiyang Zhang ret = -ENOMEM; 17495fa0405SHaiyang Zhang goto cleanup; 17595fa0405SHaiyang Zhang } 17695fa0405SHaiyang Zhang 17795fa0405SHaiyang Zhang /* 17895fa0405SHaiyang Zhang * Establish the gpadl handle for this buffer on this 17995fa0405SHaiyang Zhang * channel. Note: This call uses the vmbus connection rather 18095fa0405SHaiyang Zhang * than the channel to establish the gpadl handle. 18195fa0405SHaiyang Zhang */ 18295fa0405SHaiyang Zhang ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, 18395fa0405SHaiyang Zhang net_device->recv_buf_size, 18495fa0405SHaiyang Zhang &net_device->recv_buf_gpadl_handle); 18595fa0405SHaiyang Zhang if (ret != 0) { 18695fa0405SHaiyang Zhang netdev_err(ndev, 18795fa0405SHaiyang Zhang "unable to establish receive buffer's gpadl\n"); 18895fa0405SHaiyang Zhang goto cleanup; 18995fa0405SHaiyang Zhang } 19095fa0405SHaiyang Zhang 19195fa0405SHaiyang Zhang 19295fa0405SHaiyang Zhang /* Notify the NetVsp of the gpadl handle */ 19395fa0405SHaiyang Zhang init_packet = &net_device->channel_init_pkt; 19495fa0405SHaiyang Zhang 19595fa0405SHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 19695fa0405SHaiyang Zhang 19795fa0405SHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; 19895fa0405SHaiyang Zhang init_packet->msg.v1_msg.send_recv_buf. 19995fa0405SHaiyang Zhang gpadl_handle = net_device->recv_buf_gpadl_handle; 20095fa0405SHaiyang Zhang init_packet->msg.v1_msg. 20195fa0405SHaiyang Zhang send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 20295fa0405SHaiyang Zhang 20395fa0405SHaiyang Zhang /* Send the gpadl notification request */ 20495fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 20595fa0405SHaiyang Zhang sizeof(struct nvsp_message), 20695fa0405SHaiyang Zhang (unsigned long)init_packet, 20795fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 20895fa0405SHaiyang Zhang VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 20995fa0405SHaiyang Zhang if (ret != 0) { 21095fa0405SHaiyang Zhang netdev_err(ndev, 21195fa0405SHaiyang Zhang "unable to send receive buffer's gpadl to netvsp\n"); 21295fa0405SHaiyang Zhang goto cleanup; 21395fa0405SHaiyang Zhang } 21495fa0405SHaiyang Zhang 21595fa0405SHaiyang Zhang t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 21695fa0405SHaiyang Zhang BUG_ON(t == 0); 21795fa0405SHaiyang Zhang 21895fa0405SHaiyang Zhang 21995fa0405SHaiyang Zhang /* Check the response */ 22095fa0405SHaiyang Zhang if (init_packet->msg.v1_msg. 22195fa0405SHaiyang Zhang send_recv_buf_complete.status != NVSP_STAT_SUCCESS) { 22295fa0405SHaiyang Zhang netdev_err(ndev, "Unable to complete receive buffer " 22395fa0405SHaiyang Zhang "initialization with NetVsp - status %d\n", 22495fa0405SHaiyang Zhang init_packet->msg.v1_msg. 22595fa0405SHaiyang Zhang send_recv_buf_complete.status); 22695fa0405SHaiyang Zhang ret = -EINVAL; 22795fa0405SHaiyang Zhang goto cleanup; 22895fa0405SHaiyang Zhang } 22995fa0405SHaiyang Zhang 23095fa0405SHaiyang Zhang /* Parse the response */ 23195fa0405SHaiyang Zhang 23295fa0405SHaiyang Zhang net_device->recv_section_cnt = init_packet->msg. 23395fa0405SHaiyang Zhang v1_msg.send_recv_buf_complete.num_sections; 23495fa0405SHaiyang Zhang 235c1813200SHaiyang Zhang net_device->recv_section = kmemdup( 236c1813200SHaiyang Zhang init_packet->msg.v1_msg.send_recv_buf_complete.sections, 237c1813200SHaiyang Zhang net_device->recv_section_cnt * 238c1813200SHaiyang Zhang sizeof(struct nvsp_1_receive_buffer_section), 23995fa0405SHaiyang Zhang GFP_KERNEL); 24095fa0405SHaiyang Zhang if (net_device->recv_section == NULL) { 24195fa0405SHaiyang Zhang ret = -EINVAL; 24295fa0405SHaiyang Zhang goto cleanup; 24395fa0405SHaiyang Zhang } 24495fa0405SHaiyang Zhang 24595fa0405SHaiyang Zhang /* 24695fa0405SHaiyang Zhang * For 1st release, there should only be 1 section that represents the 24795fa0405SHaiyang Zhang * entire receive buffer 24895fa0405SHaiyang Zhang */ 24995fa0405SHaiyang Zhang if (net_device->recv_section_cnt != 1 || 25095fa0405SHaiyang Zhang net_device->recv_section->offset != 0) { 25195fa0405SHaiyang Zhang ret = -EINVAL; 25295fa0405SHaiyang Zhang goto cleanup; 25395fa0405SHaiyang Zhang } 25495fa0405SHaiyang Zhang 25595fa0405SHaiyang Zhang goto exit; 25695fa0405SHaiyang Zhang 25795fa0405SHaiyang Zhang cleanup: 25895fa0405SHaiyang Zhang netvsc_destroy_recv_buf(net_device); 25995fa0405SHaiyang Zhang 26095fa0405SHaiyang Zhang exit: 26195fa0405SHaiyang Zhang return ret; 26295fa0405SHaiyang Zhang } 26395fa0405SHaiyang Zhang 26495fa0405SHaiyang Zhang 265f157e78dSHaiyang Zhang /* Negotiate NVSP protocol version */ 266f157e78dSHaiyang Zhang static int negotiate_nvsp_ver(struct hv_device *device, 267f157e78dSHaiyang Zhang struct netvsc_device *net_device, 268f157e78dSHaiyang Zhang struct nvsp_message *init_packet, 269f157e78dSHaiyang Zhang u32 nvsp_ver) 27095fa0405SHaiyang Zhang { 27195fa0405SHaiyang Zhang int ret, t; 272f157e78dSHaiyang Zhang 273f157e78dSHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 274f157e78dSHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; 275f157e78dSHaiyang Zhang init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; 276f157e78dSHaiyang Zhang init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; 277f157e78dSHaiyang Zhang 278f157e78dSHaiyang Zhang /* Send the init request */ 279f157e78dSHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 280f157e78dSHaiyang Zhang sizeof(struct nvsp_message), 281f157e78dSHaiyang Zhang (unsigned long)init_packet, 282f157e78dSHaiyang Zhang VM_PKT_DATA_INBAND, 283f157e78dSHaiyang Zhang VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 284f157e78dSHaiyang Zhang 285f157e78dSHaiyang Zhang if (ret != 0) 286f157e78dSHaiyang Zhang return ret; 287f157e78dSHaiyang Zhang 288f157e78dSHaiyang Zhang t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 289f157e78dSHaiyang Zhang 290f157e78dSHaiyang Zhang if (t == 0) 291f157e78dSHaiyang Zhang return -ETIMEDOUT; 292f157e78dSHaiyang Zhang 293f157e78dSHaiyang Zhang if (init_packet->msg.init_msg.init_complete.status != 294f157e78dSHaiyang Zhang NVSP_STAT_SUCCESS) 295f157e78dSHaiyang Zhang return -EINVAL; 296f157e78dSHaiyang Zhang 297f157e78dSHaiyang Zhang if (nvsp_ver != NVSP_PROTOCOL_VERSION_2) 298f157e78dSHaiyang Zhang return 0; 299f157e78dSHaiyang Zhang 300f157e78dSHaiyang Zhang /* NVSPv2 only: Send NDIS config */ 301f157e78dSHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 302f157e78dSHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; 3034d447c9aSHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu; 3041f5f3a75SHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; 305f157e78dSHaiyang Zhang 306f157e78dSHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 307f157e78dSHaiyang Zhang sizeof(struct nvsp_message), 308f157e78dSHaiyang Zhang (unsigned long)init_packet, 309f157e78dSHaiyang Zhang VM_PKT_DATA_INBAND, 0); 310f157e78dSHaiyang Zhang 311f157e78dSHaiyang Zhang return ret; 312f157e78dSHaiyang Zhang } 313f157e78dSHaiyang Zhang 314f157e78dSHaiyang Zhang static int netvsc_connect_vsp(struct hv_device *device) 315f157e78dSHaiyang Zhang { 316f157e78dSHaiyang Zhang int ret; 31795fa0405SHaiyang Zhang struct netvsc_device *net_device; 31895fa0405SHaiyang Zhang struct nvsp_message *init_packet; 31995fa0405SHaiyang Zhang int ndis_version; 32095fa0405SHaiyang Zhang struct net_device *ndev; 32195fa0405SHaiyang Zhang 32295fa0405SHaiyang Zhang net_device = get_outbound_net_device(device); 32395fa0405SHaiyang Zhang if (!net_device) 32495fa0405SHaiyang Zhang return -ENODEV; 32595fa0405SHaiyang Zhang ndev = net_device->ndev; 32695fa0405SHaiyang Zhang 32795fa0405SHaiyang Zhang init_packet = &net_device->channel_init_pkt; 32895fa0405SHaiyang Zhang 329f157e78dSHaiyang Zhang /* Negotiate the latest NVSP protocol supported */ 330f157e78dSHaiyang Zhang if (negotiate_nvsp_ver(device, net_device, init_packet, 331f157e78dSHaiyang Zhang NVSP_PROTOCOL_VERSION_2) == 0) { 332f157e78dSHaiyang Zhang net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2; 333f157e78dSHaiyang Zhang } else if (negotiate_nvsp_ver(device, net_device, init_packet, 334f157e78dSHaiyang Zhang NVSP_PROTOCOL_VERSION_1) == 0) { 335f157e78dSHaiyang Zhang net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1; 336f157e78dSHaiyang Zhang } else { 33795fa0405SHaiyang Zhang ret = -EPROTO; 33895fa0405SHaiyang Zhang goto cleanup; 33995fa0405SHaiyang Zhang } 340f157e78dSHaiyang Zhang 341f157e78dSHaiyang Zhang pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); 342f157e78dSHaiyang Zhang 34395fa0405SHaiyang Zhang /* Send the ndis version */ 34495fa0405SHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 34595fa0405SHaiyang Zhang 3461f5f3a75SHaiyang Zhang ndis_version = 0x00050001; 34795fa0405SHaiyang Zhang 34895fa0405SHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; 34995fa0405SHaiyang Zhang init_packet->msg.v1_msg. 35095fa0405SHaiyang Zhang send_ndis_ver.ndis_major_ver = 35195fa0405SHaiyang Zhang (ndis_version & 0xFFFF0000) >> 16; 35295fa0405SHaiyang Zhang init_packet->msg.v1_msg. 35395fa0405SHaiyang Zhang send_ndis_ver.ndis_minor_ver = 35495fa0405SHaiyang Zhang ndis_version & 0xFFFF; 35595fa0405SHaiyang Zhang 35695fa0405SHaiyang Zhang /* Send the init request */ 35795fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 35895fa0405SHaiyang Zhang sizeof(struct nvsp_message), 35995fa0405SHaiyang Zhang (unsigned long)init_packet, 36095fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 0); 36195fa0405SHaiyang Zhang if (ret != 0) 36295fa0405SHaiyang Zhang goto cleanup; 36395fa0405SHaiyang Zhang 36495fa0405SHaiyang Zhang /* Post the big receive buffer to NetVSP */ 36595fa0405SHaiyang Zhang ret = netvsc_init_recv_buf(device); 36695fa0405SHaiyang Zhang 36795fa0405SHaiyang Zhang cleanup: 36895fa0405SHaiyang Zhang return ret; 36995fa0405SHaiyang Zhang } 37095fa0405SHaiyang Zhang 37195fa0405SHaiyang Zhang static void netvsc_disconnect_vsp(struct netvsc_device *net_device) 37295fa0405SHaiyang Zhang { 37395fa0405SHaiyang Zhang netvsc_destroy_recv_buf(net_device); 37495fa0405SHaiyang Zhang } 37595fa0405SHaiyang Zhang 37695fa0405SHaiyang Zhang /* 37795fa0405SHaiyang Zhang * netvsc_device_remove - Callback when the root bus device is removed 37895fa0405SHaiyang Zhang */ 37995fa0405SHaiyang Zhang int netvsc_device_remove(struct hv_device *device) 38095fa0405SHaiyang Zhang { 38195fa0405SHaiyang Zhang struct netvsc_device *net_device; 38295fa0405SHaiyang Zhang struct hv_netvsc_packet *netvsc_packet, *pos; 38395fa0405SHaiyang Zhang unsigned long flags; 38495fa0405SHaiyang Zhang 38595fa0405SHaiyang Zhang net_device = hv_get_drvdata(device); 38695fa0405SHaiyang Zhang 38795fa0405SHaiyang Zhang netvsc_disconnect_vsp(net_device); 38895fa0405SHaiyang Zhang 38995fa0405SHaiyang Zhang /* 39095fa0405SHaiyang Zhang * Since we have already drained, we don't need to busy wait 39195fa0405SHaiyang Zhang * as was done in final_release_stor_device() 39295fa0405SHaiyang Zhang * Note that we cannot set the ext pointer to NULL until 39395fa0405SHaiyang Zhang * we have drained - to drain the outgoing packets, we need to 39495fa0405SHaiyang Zhang * allow incoming packets. 39595fa0405SHaiyang Zhang */ 39695fa0405SHaiyang Zhang 39795fa0405SHaiyang Zhang spin_lock_irqsave(&device->channel->inbound_lock, flags); 39895fa0405SHaiyang Zhang hv_set_drvdata(device, NULL); 39995fa0405SHaiyang Zhang spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 40095fa0405SHaiyang Zhang 40195fa0405SHaiyang Zhang /* 40295fa0405SHaiyang Zhang * At this point, no one should be accessing net_device 40395fa0405SHaiyang Zhang * except in here 40495fa0405SHaiyang Zhang */ 40595fa0405SHaiyang Zhang dev_notice(&device->device, "net device safe to remove\n"); 40695fa0405SHaiyang Zhang 40795fa0405SHaiyang Zhang /* Now, we can close the channel safely */ 40895fa0405SHaiyang Zhang vmbus_close(device->channel); 40995fa0405SHaiyang Zhang 41095fa0405SHaiyang Zhang /* Release all resources */ 41195fa0405SHaiyang Zhang list_for_each_entry_safe(netvsc_packet, pos, 41295fa0405SHaiyang Zhang &net_device->recv_pkt_list, list_ent) { 41395fa0405SHaiyang Zhang list_del(&netvsc_packet->list_ent); 41495fa0405SHaiyang Zhang kfree(netvsc_packet); 41595fa0405SHaiyang Zhang } 41695fa0405SHaiyang Zhang 41795fa0405SHaiyang Zhang kfree(net_device); 41895fa0405SHaiyang Zhang return 0; 41995fa0405SHaiyang Zhang } 42095fa0405SHaiyang Zhang 42133be96e4SHaiyang Zhang 42233be96e4SHaiyang Zhang #define RING_AVAIL_PERCENT_HIWATER 20 42333be96e4SHaiyang Zhang #define RING_AVAIL_PERCENT_LOWATER 10 42433be96e4SHaiyang Zhang 42533be96e4SHaiyang Zhang /* 42633be96e4SHaiyang Zhang * Get the percentage of available bytes to write in the ring. 42733be96e4SHaiyang Zhang * The return value is in range from 0 to 100. 42833be96e4SHaiyang Zhang */ 42933be96e4SHaiyang Zhang static inline u32 hv_ringbuf_avail_percent( 43033be96e4SHaiyang Zhang struct hv_ring_buffer_info *ring_info) 43133be96e4SHaiyang Zhang { 43233be96e4SHaiyang Zhang u32 avail_read, avail_write; 43333be96e4SHaiyang Zhang 43433be96e4SHaiyang Zhang hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); 43533be96e4SHaiyang Zhang 43633be96e4SHaiyang Zhang return avail_write * 100 / ring_info->ring_datasize; 43733be96e4SHaiyang Zhang } 43833be96e4SHaiyang Zhang 43995fa0405SHaiyang Zhang static void netvsc_send_completion(struct hv_device *device, 44095fa0405SHaiyang Zhang struct vmpacket_descriptor *packet) 44195fa0405SHaiyang Zhang { 44295fa0405SHaiyang Zhang struct netvsc_device *net_device; 44395fa0405SHaiyang Zhang struct nvsp_message *nvsp_packet; 44495fa0405SHaiyang Zhang struct hv_netvsc_packet *nvsc_packet; 44595fa0405SHaiyang Zhang struct net_device *ndev; 44695fa0405SHaiyang Zhang 44795fa0405SHaiyang Zhang net_device = get_inbound_net_device(device); 44895fa0405SHaiyang Zhang if (!net_device) 44995fa0405SHaiyang Zhang return; 45095fa0405SHaiyang Zhang ndev = net_device->ndev; 45195fa0405SHaiyang Zhang 45295fa0405SHaiyang Zhang nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 45395fa0405SHaiyang Zhang (packet->offset8 << 3)); 45495fa0405SHaiyang Zhang 45595fa0405SHaiyang Zhang if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) || 45695fa0405SHaiyang Zhang (nvsp_packet->hdr.msg_type == 45795fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) || 45895fa0405SHaiyang Zhang (nvsp_packet->hdr.msg_type == 45995fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) { 46095fa0405SHaiyang Zhang /* Copy the response back */ 46195fa0405SHaiyang Zhang memcpy(&net_device->channel_init_pkt, nvsp_packet, 46295fa0405SHaiyang Zhang sizeof(struct nvsp_message)); 46395fa0405SHaiyang Zhang complete(&net_device->channel_init_wait); 46495fa0405SHaiyang Zhang } else if (nvsp_packet->hdr.msg_type == 46595fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) { 46633be96e4SHaiyang Zhang int num_outstanding_sends; 46733be96e4SHaiyang Zhang 46895fa0405SHaiyang Zhang /* Get the send context */ 46995fa0405SHaiyang Zhang nvsc_packet = (struct hv_netvsc_packet *)(unsigned long) 47095fa0405SHaiyang Zhang packet->trans_id; 47195fa0405SHaiyang Zhang 47295fa0405SHaiyang Zhang /* Notify the layer above us */ 473f1ea3cd7SHaiyang Zhang if (nvsc_packet) 47495fa0405SHaiyang Zhang nvsc_packet->completion.send.send_completion( 475f1ea3cd7SHaiyang Zhang nvsc_packet->completion.send. 476f1ea3cd7SHaiyang Zhang send_completion_ctx); 47795fa0405SHaiyang Zhang 47833be96e4SHaiyang Zhang num_outstanding_sends = 47933be96e4SHaiyang Zhang atomic_dec_return(&net_device->num_outstanding_sends); 4801d06825bSHaiyang Zhang 481dc5cd894SHaiyang Zhang if (net_device->destroy && num_outstanding_sends == 0) 482dc5cd894SHaiyang Zhang wake_up(&net_device->wait_drain); 483dc5cd894SHaiyang Zhang 48433be96e4SHaiyang Zhang if (netif_queue_stopped(ndev) && !net_device->start_remove && 48533be96e4SHaiyang Zhang (hv_ringbuf_avail_percent(&device->channel->outbound) 48633be96e4SHaiyang Zhang > RING_AVAIL_PERCENT_HIWATER || 48733be96e4SHaiyang Zhang num_outstanding_sends < 1)) 4881d06825bSHaiyang Zhang netif_wake_queue(ndev); 48995fa0405SHaiyang Zhang } else { 49095fa0405SHaiyang Zhang netdev_err(ndev, "Unknown send completion packet type- " 49195fa0405SHaiyang Zhang "%d received!!\n", nvsp_packet->hdr.msg_type); 49295fa0405SHaiyang Zhang } 49395fa0405SHaiyang Zhang 49495fa0405SHaiyang Zhang } 49595fa0405SHaiyang Zhang 49695fa0405SHaiyang Zhang int netvsc_send(struct hv_device *device, 49795fa0405SHaiyang Zhang struct hv_netvsc_packet *packet) 49895fa0405SHaiyang Zhang { 49995fa0405SHaiyang Zhang struct netvsc_device *net_device; 50095fa0405SHaiyang Zhang int ret = 0; 50195fa0405SHaiyang Zhang struct nvsp_message sendMessage; 50295fa0405SHaiyang Zhang struct net_device *ndev; 503f1ea3cd7SHaiyang Zhang u64 req_id; 50495fa0405SHaiyang Zhang 50595fa0405SHaiyang Zhang net_device = get_outbound_net_device(device); 50695fa0405SHaiyang Zhang if (!net_device) 50795fa0405SHaiyang Zhang return -ENODEV; 50895fa0405SHaiyang Zhang ndev = net_device->ndev; 50995fa0405SHaiyang Zhang 51095fa0405SHaiyang Zhang sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; 51195fa0405SHaiyang Zhang if (packet->is_data_pkt) { 51295fa0405SHaiyang Zhang /* 0 is RMC_DATA; */ 51395fa0405SHaiyang Zhang sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0; 51495fa0405SHaiyang Zhang } else { 51595fa0405SHaiyang Zhang /* 1 is RMC_CONTROL; */ 51695fa0405SHaiyang Zhang sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1; 51795fa0405SHaiyang Zhang } 51895fa0405SHaiyang Zhang 51995fa0405SHaiyang Zhang /* Not using send buffer section */ 52095fa0405SHaiyang Zhang sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index = 52195fa0405SHaiyang Zhang 0xFFFFFFFF; 52295fa0405SHaiyang Zhang sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; 52395fa0405SHaiyang Zhang 524f1ea3cd7SHaiyang Zhang if (packet->completion.send.send_completion) 52500ca8f0cSHaiyang Zhang req_id = (ulong)packet; 526f1ea3cd7SHaiyang Zhang else 527f1ea3cd7SHaiyang Zhang req_id = 0; 528f1ea3cd7SHaiyang Zhang 52995fa0405SHaiyang Zhang if (packet->page_buf_cnt) { 53095fa0405SHaiyang Zhang ret = vmbus_sendpacket_pagebuffer(device->channel, 53195fa0405SHaiyang Zhang packet->page_buf, 53295fa0405SHaiyang Zhang packet->page_buf_cnt, 53395fa0405SHaiyang Zhang &sendMessage, 53495fa0405SHaiyang Zhang sizeof(struct nvsp_message), 535f1ea3cd7SHaiyang Zhang req_id); 53695fa0405SHaiyang Zhang } else { 53795fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, &sendMessage, 53895fa0405SHaiyang Zhang sizeof(struct nvsp_message), 539f1ea3cd7SHaiyang Zhang req_id, 54095fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 54195fa0405SHaiyang Zhang VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 54295fa0405SHaiyang Zhang } 54395fa0405SHaiyang Zhang 5441d06825bSHaiyang Zhang if (ret == 0) { 5451d06825bSHaiyang Zhang atomic_inc(&net_device->num_outstanding_sends); 54633be96e4SHaiyang Zhang if (hv_ringbuf_avail_percent(&device->channel->outbound) < 54733be96e4SHaiyang Zhang RING_AVAIL_PERCENT_LOWATER) { 54833be96e4SHaiyang Zhang netif_stop_queue(ndev); 54933be96e4SHaiyang Zhang if (atomic_read(&net_device-> 55033be96e4SHaiyang Zhang num_outstanding_sends) < 1) 55133be96e4SHaiyang Zhang netif_wake_queue(ndev); 55233be96e4SHaiyang Zhang } 5531d06825bSHaiyang Zhang } else if (ret == -EAGAIN) { 5541d06825bSHaiyang Zhang netif_stop_queue(ndev); 55533be96e4SHaiyang Zhang if (atomic_read(&net_device->num_outstanding_sends) < 1) { 5561d06825bSHaiyang Zhang netif_wake_queue(ndev); 55733be96e4SHaiyang Zhang ret = -ENOSPC; 55833be96e4SHaiyang Zhang } 5591d06825bSHaiyang Zhang } else { 56095fa0405SHaiyang Zhang netdev_err(ndev, "Unable to send packet %p ret %d\n", 56195fa0405SHaiyang Zhang packet, ret); 5621d06825bSHaiyang Zhang } 56395fa0405SHaiyang Zhang 56495fa0405SHaiyang Zhang return ret; 56595fa0405SHaiyang Zhang } 56695fa0405SHaiyang Zhang 56795fa0405SHaiyang Zhang static void netvsc_send_recv_completion(struct hv_device *device, 56863f6921dSHaiyang Zhang u64 transaction_id, u32 status) 56995fa0405SHaiyang Zhang { 57095fa0405SHaiyang Zhang struct nvsp_message recvcompMessage; 57195fa0405SHaiyang Zhang int retries = 0; 57295fa0405SHaiyang Zhang int ret; 57395fa0405SHaiyang Zhang struct net_device *ndev; 57495fa0405SHaiyang Zhang struct netvsc_device *net_device = hv_get_drvdata(device); 57595fa0405SHaiyang Zhang 57695fa0405SHaiyang Zhang ndev = net_device->ndev; 57795fa0405SHaiyang Zhang 57895fa0405SHaiyang Zhang recvcompMessage.hdr.msg_type = 57995fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; 58095fa0405SHaiyang Zhang 58163f6921dSHaiyang Zhang recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status; 58295fa0405SHaiyang Zhang 58395fa0405SHaiyang Zhang retry_send_cmplt: 58495fa0405SHaiyang Zhang /* Send the completion */ 58595fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, &recvcompMessage, 58695fa0405SHaiyang Zhang sizeof(struct nvsp_message), transaction_id, 58795fa0405SHaiyang Zhang VM_PKT_COMP, 0); 58895fa0405SHaiyang Zhang if (ret == 0) { 58995fa0405SHaiyang Zhang /* success */ 59095fa0405SHaiyang Zhang /* no-op */ 59195fa0405SHaiyang Zhang } else if (ret == -EAGAIN) { 59295fa0405SHaiyang Zhang /* no more room...wait a bit and attempt to retry 3 times */ 59395fa0405SHaiyang Zhang retries++; 59495fa0405SHaiyang Zhang netdev_err(ndev, "unable to send receive completion pkt" 59595fa0405SHaiyang Zhang " (tid %llx)...retrying %d\n", transaction_id, retries); 59695fa0405SHaiyang Zhang 59795fa0405SHaiyang Zhang if (retries < 4) { 59895fa0405SHaiyang Zhang udelay(100); 59995fa0405SHaiyang Zhang goto retry_send_cmplt; 60095fa0405SHaiyang Zhang } else { 60195fa0405SHaiyang Zhang netdev_err(ndev, "unable to send receive " 60295fa0405SHaiyang Zhang "completion pkt (tid %llx)...give up retrying\n", 60395fa0405SHaiyang Zhang transaction_id); 60495fa0405SHaiyang Zhang } 60595fa0405SHaiyang Zhang } else { 60695fa0405SHaiyang Zhang netdev_err(ndev, "unable to send receive " 60795fa0405SHaiyang Zhang "completion pkt - %llx\n", transaction_id); 60895fa0405SHaiyang Zhang } 60995fa0405SHaiyang Zhang } 61095fa0405SHaiyang Zhang 61195fa0405SHaiyang Zhang /* Send a receive completion packet to RNDIS device (ie NetVsp) */ 61295fa0405SHaiyang Zhang static void netvsc_receive_completion(void *context) 61395fa0405SHaiyang Zhang { 61495fa0405SHaiyang Zhang struct hv_netvsc_packet *packet = context; 615c2fd03a0SJoe Perches struct hv_device *device = packet->device; 61695fa0405SHaiyang Zhang struct netvsc_device *net_device; 61795fa0405SHaiyang Zhang u64 transaction_id = 0; 61895fa0405SHaiyang Zhang bool fsend_receive_comp = false; 61995fa0405SHaiyang Zhang unsigned long flags; 62095fa0405SHaiyang Zhang struct net_device *ndev; 62163f6921dSHaiyang Zhang u32 status = NVSP_STAT_NONE; 62295fa0405SHaiyang Zhang 62395fa0405SHaiyang Zhang /* 62495fa0405SHaiyang Zhang * Even though it seems logical to do a GetOutboundNetDevice() here to 62595fa0405SHaiyang Zhang * send out receive completion, we are using GetInboundNetDevice() 62695fa0405SHaiyang Zhang * since we may have disable outbound traffic already. 62795fa0405SHaiyang Zhang */ 62895fa0405SHaiyang Zhang net_device = get_inbound_net_device(device); 62995fa0405SHaiyang Zhang if (!net_device) 63095fa0405SHaiyang Zhang return; 63195fa0405SHaiyang Zhang ndev = net_device->ndev; 63295fa0405SHaiyang Zhang 63395fa0405SHaiyang Zhang /* Overloading use of the lock. */ 63495fa0405SHaiyang Zhang spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 63595fa0405SHaiyang Zhang 63663f6921dSHaiyang Zhang if (packet->status != NVSP_STAT_SUCCESS) 63763f6921dSHaiyang Zhang packet->xfer_page_pkt->status = NVSP_STAT_FAIL; 63863f6921dSHaiyang Zhang 63995fa0405SHaiyang Zhang packet->xfer_page_pkt->count--; 64095fa0405SHaiyang Zhang 64195fa0405SHaiyang Zhang /* 64295fa0405SHaiyang Zhang * Last one in the line that represent 1 xfer page packet. 64395fa0405SHaiyang Zhang * Return the xfer page packet itself to the freelist 64495fa0405SHaiyang Zhang */ 64595fa0405SHaiyang Zhang if (packet->xfer_page_pkt->count == 0) { 64695fa0405SHaiyang Zhang fsend_receive_comp = true; 64795fa0405SHaiyang Zhang transaction_id = packet->completion.recv.recv_completion_tid; 64863f6921dSHaiyang Zhang status = packet->xfer_page_pkt->status; 64995fa0405SHaiyang Zhang list_add_tail(&packet->xfer_page_pkt->list_ent, 65095fa0405SHaiyang Zhang &net_device->recv_pkt_list); 65195fa0405SHaiyang Zhang 65295fa0405SHaiyang Zhang } 65395fa0405SHaiyang Zhang 65495fa0405SHaiyang Zhang /* Put the packet back */ 65595fa0405SHaiyang Zhang list_add_tail(&packet->list_ent, &net_device->recv_pkt_list); 65695fa0405SHaiyang Zhang spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); 65795fa0405SHaiyang Zhang 65895fa0405SHaiyang Zhang /* Send a receive completion for the xfer page packet */ 65995fa0405SHaiyang Zhang if (fsend_receive_comp) 66063f6921dSHaiyang Zhang netvsc_send_recv_completion(device, transaction_id, status); 66195fa0405SHaiyang Zhang 66295fa0405SHaiyang Zhang } 66395fa0405SHaiyang Zhang 66495fa0405SHaiyang Zhang static void netvsc_receive(struct hv_device *device, 66595fa0405SHaiyang Zhang struct vmpacket_descriptor *packet) 66695fa0405SHaiyang Zhang { 66795fa0405SHaiyang Zhang struct netvsc_device *net_device; 66895fa0405SHaiyang Zhang struct vmtransfer_page_packet_header *vmxferpage_packet; 66995fa0405SHaiyang Zhang struct nvsp_message *nvsp_packet; 67095fa0405SHaiyang Zhang struct hv_netvsc_packet *netvsc_packet = NULL; 67195fa0405SHaiyang Zhang /* struct netvsc_driver *netvscDriver; */ 67295fa0405SHaiyang Zhang struct xferpage_packet *xferpage_packet = NULL; 67345326342SHaiyang Zhang int i; 67445326342SHaiyang Zhang int count = 0; 67595fa0405SHaiyang Zhang unsigned long flags; 67695fa0405SHaiyang Zhang struct net_device *ndev; 67795fa0405SHaiyang Zhang 67895fa0405SHaiyang Zhang LIST_HEAD(listHead); 67995fa0405SHaiyang Zhang 68095fa0405SHaiyang Zhang net_device = get_inbound_net_device(device); 68195fa0405SHaiyang Zhang if (!net_device) 68295fa0405SHaiyang Zhang return; 68395fa0405SHaiyang Zhang ndev = net_device->ndev; 68495fa0405SHaiyang Zhang 68595fa0405SHaiyang Zhang /* 68695fa0405SHaiyang Zhang * All inbound packets other than send completion should be xfer page 68795fa0405SHaiyang Zhang * packet 68895fa0405SHaiyang Zhang */ 68995fa0405SHaiyang Zhang if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { 69095fa0405SHaiyang Zhang netdev_err(ndev, "Unknown packet type received - %d\n", 69195fa0405SHaiyang Zhang packet->type); 69295fa0405SHaiyang Zhang return; 69395fa0405SHaiyang Zhang } 69495fa0405SHaiyang Zhang 69595fa0405SHaiyang Zhang nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 69695fa0405SHaiyang Zhang (packet->offset8 << 3)); 69795fa0405SHaiyang Zhang 69895fa0405SHaiyang Zhang /* Make sure this is a valid nvsp packet */ 69995fa0405SHaiyang Zhang if (nvsp_packet->hdr.msg_type != 70095fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RNDIS_PKT) { 70195fa0405SHaiyang Zhang netdev_err(ndev, "Unknown nvsp packet type received-" 70295fa0405SHaiyang Zhang " %d\n", nvsp_packet->hdr.msg_type); 70395fa0405SHaiyang Zhang return; 70495fa0405SHaiyang Zhang } 70595fa0405SHaiyang Zhang 70695fa0405SHaiyang Zhang vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; 70795fa0405SHaiyang Zhang 70895fa0405SHaiyang Zhang if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { 70995fa0405SHaiyang Zhang netdev_err(ndev, "Invalid xfer page set id - " 71095fa0405SHaiyang Zhang "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID, 71195fa0405SHaiyang Zhang vmxferpage_packet->xfer_pageset_id); 71295fa0405SHaiyang Zhang return; 71395fa0405SHaiyang Zhang } 71495fa0405SHaiyang Zhang 71595fa0405SHaiyang Zhang /* 71695fa0405SHaiyang Zhang * Grab free packets (range count + 1) to represent this xfer 71795fa0405SHaiyang Zhang * page packet. +1 to represent the xfer page packet itself. 71895fa0405SHaiyang Zhang * We grab it here so that we know exactly how many we can 71995fa0405SHaiyang Zhang * fulfil 72095fa0405SHaiyang Zhang */ 72195fa0405SHaiyang Zhang spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 72295fa0405SHaiyang Zhang while (!list_empty(&net_device->recv_pkt_list)) { 72395fa0405SHaiyang Zhang list_move_tail(net_device->recv_pkt_list.next, &listHead); 72495fa0405SHaiyang Zhang if (++count == vmxferpage_packet->range_cnt + 1) 72595fa0405SHaiyang Zhang break; 72695fa0405SHaiyang Zhang } 72795fa0405SHaiyang Zhang spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); 72895fa0405SHaiyang Zhang 72995fa0405SHaiyang Zhang /* 73095fa0405SHaiyang Zhang * We need at least 2 netvsc pkts (1 to represent the xfer 73195fa0405SHaiyang Zhang * page and at least 1 for the range) i.e. we can handled 73295fa0405SHaiyang Zhang * some of the xfer page packet ranges... 73395fa0405SHaiyang Zhang */ 73495fa0405SHaiyang Zhang if (count < 2) { 73595fa0405SHaiyang Zhang netdev_err(ndev, "Got only %d netvsc pkt...needed " 73695fa0405SHaiyang Zhang "%d pkts. Dropping this xfer page packet completely!\n", 73795fa0405SHaiyang Zhang count, vmxferpage_packet->range_cnt + 1); 73895fa0405SHaiyang Zhang 73995fa0405SHaiyang Zhang /* Return it to the freelist */ 74095fa0405SHaiyang Zhang spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 74195fa0405SHaiyang Zhang for (i = count; i != 0; i--) { 74295fa0405SHaiyang Zhang list_move_tail(listHead.next, 74395fa0405SHaiyang Zhang &net_device->recv_pkt_list); 74495fa0405SHaiyang Zhang } 74595fa0405SHaiyang Zhang spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, 74695fa0405SHaiyang Zhang flags); 74795fa0405SHaiyang Zhang 74895fa0405SHaiyang Zhang netvsc_send_recv_completion(device, 74963f6921dSHaiyang Zhang vmxferpage_packet->d.trans_id, 75063f6921dSHaiyang Zhang NVSP_STAT_FAIL); 75195fa0405SHaiyang Zhang 75295fa0405SHaiyang Zhang return; 75395fa0405SHaiyang Zhang } 75495fa0405SHaiyang Zhang 75595fa0405SHaiyang Zhang /* Remove the 1st packet to represent the xfer page packet itself */ 75695fa0405SHaiyang Zhang xferpage_packet = (struct xferpage_packet *)listHead.next; 75795fa0405SHaiyang Zhang list_del(&xferpage_packet->list_ent); 75863f6921dSHaiyang Zhang xferpage_packet->status = NVSP_STAT_SUCCESS; 75995fa0405SHaiyang Zhang 76095fa0405SHaiyang Zhang /* This is how much we can satisfy */ 76195fa0405SHaiyang Zhang xferpage_packet->count = count - 1; 76295fa0405SHaiyang Zhang 76395fa0405SHaiyang Zhang if (xferpage_packet->count != vmxferpage_packet->range_cnt) { 76495fa0405SHaiyang Zhang netdev_err(ndev, "Needed %d netvsc pkts to satisfy " 76595fa0405SHaiyang Zhang "this xfer page...got %d\n", 76695fa0405SHaiyang Zhang vmxferpage_packet->range_cnt, xferpage_packet->count); 76795fa0405SHaiyang Zhang } 76895fa0405SHaiyang Zhang 76995fa0405SHaiyang Zhang /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ 77095fa0405SHaiyang Zhang for (i = 0; i < (count - 1); i++) { 77195fa0405SHaiyang Zhang netvsc_packet = (struct hv_netvsc_packet *)listHead.next; 77295fa0405SHaiyang Zhang list_del(&netvsc_packet->list_ent); 77395fa0405SHaiyang Zhang 77495fa0405SHaiyang Zhang /* Initialize the netvsc packet */ 77563f6921dSHaiyang Zhang netvsc_packet->status = NVSP_STAT_SUCCESS; 77695fa0405SHaiyang Zhang netvsc_packet->xfer_page_pkt = xferpage_packet; 77795fa0405SHaiyang Zhang netvsc_packet->completion.recv.recv_completion = 77895fa0405SHaiyang Zhang netvsc_receive_completion; 77995fa0405SHaiyang Zhang netvsc_packet->completion.recv.recv_completion_ctx = 78095fa0405SHaiyang Zhang netvsc_packet; 78195fa0405SHaiyang Zhang netvsc_packet->device = device; 78295fa0405SHaiyang Zhang /* Save this so that we can send it back */ 78395fa0405SHaiyang Zhang netvsc_packet->completion.recv.recv_completion_tid = 78495fa0405SHaiyang Zhang vmxferpage_packet->d.trans_id; 78595fa0405SHaiyang Zhang 78645326342SHaiyang Zhang netvsc_packet->data = (void *)((unsigned long)net_device-> 78745326342SHaiyang Zhang recv_buf + vmxferpage_packet->ranges[i].byte_offset); 78895fa0405SHaiyang Zhang netvsc_packet->total_data_buflen = 78995fa0405SHaiyang Zhang vmxferpage_packet->ranges[i].byte_count; 79095fa0405SHaiyang Zhang 79195fa0405SHaiyang Zhang /* Pass it to the upper layer */ 79295fa0405SHaiyang Zhang rndis_filter_receive(device, netvsc_packet); 79395fa0405SHaiyang Zhang 79495fa0405SHaiyang Zhang netvsc_receive_completion(netvsc_packet-> 79595fa0405SHaiyang Zhang completion.recv.recv_completion_ctx); 79695fa0405SHaiyang Zhang } 79795fa0405SHaiyang Zhang 79895fa0405SHaiyang Zhang } 79995fa0405SHaiyang Zhang 80095fa0405SHaiyang Zhang static void netvsc_channel_cb(void *context) 80195fa0405SHaiyang Zhang { 80295fa0405SHaiyang Zhang int ret; 80395fa0405SHaiyang Zhang struct hv_device *device = context; 80495fa0405SHaiyang Zhang struct netvsc_device *net_device; 80595fa0405SHaiyang Zhang u32 bytes_recvd; 80695fa0405SHaiyang Zhang u64 request_id; 80795fa0405SHaiyang Zhang unsigned char *packet; 80895fa0405SHaiyang Zhang struct vmpacket_descriptor *desc; 80995fa0405SHaiyang Zhang unsigned char *buffer; 81095fa0405SHaiyang Zhang int bufferlen = NETVSC_PACKET_SIZE; 81195fa0405SHaiyang Zhang struct net_device *ndev; 81295fa0405SHaiyang Zhang 81395fa0405SHaiyang Zhang packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char), 81495fa0405SHaiyang Zhang GFP_ATOMIC); 81595fa0405SHaiyang Zhang if (!packet) 81695fa0405SHaiyang Zhang return; 81795fa0405SHaiyang Zhang buffer = packet; 81895fa0405SHaiyang Zhang 81995fa0405SHaiyang Zhang net_device = get_inbound_net_device(device); 82095fa0405SHaiyang Zhang if (!net_device) 82195fa0405SHaiyang Zhang goto out; 82295fa0405SHaiyang Zhang ndev = net_device->ndev; 82395fa0405SHaiyang Zhang 82495fa0405SHaiyang Zhang do { 82595fa0405SHaiyang Zhang ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen, 82695fa0405SHaiyang Zhang &bytes_recvd, &request_id); 82795fa0405SHaiyang Zhang if (ret == 0) { 82895fa0405SHaiyang Zhang if (bytes_recvd > 0) { 82995fa0405SHaiyang Zhang desc = (struct vmpacket_descriptor *)buffer; 83095fa0405SHaiyang Zhang switch (desc->type) { 83195fa0405SHaiyang Zhang case VM_PKT_COMP: 83295fa0405SHaiyang Zhang netvsc_send_completion(device, desc); 83395fa0405SHaiyang Zhang break; 83495fa0405SHaiyang Zhang 83595fa0405SHaiyang Zhang case VM_PKT_DATA_USING_XFER_PAGES: 83695fa0405SHaiyang Zhang netvsc_receive(device, desc); 83795fa0405SHaiyang Zhang break; 83895fa0405SHaiyang Zhang 83995fa0405SHaiyang Zhang default: 84095fa0405SHaiyang Zhang netdev_err(ndev, 84195fa0405SHaiyang Zhang "unhandled packet type %d, " 84295fa0405SHaiyang Zhang "tid %llx len %d\n", 84395fa0405SHaiyang Zhang desc->type, request_id, 84495fa0405SHaiyang Zhang bytes_recvd); 84595fa0405SHaiyang Zhang break; 84695fa0405SHaiyang Zhang } 84795fa0405SHaiyang Zhang 84895fa0405SHaiyang Zhang /* reset */ 84995fa0405SHaiyang Zhang if (bufferlen > NETVSC_PACKET_SIZE) { 85095fa0405SHaiyang Zhang kfree(buffer); 85195fa0405SHaiyang Zhang buffer = packet; 85295fa0405SHaiyang Zhang bufferlen = NETVSC_PACKET_SIZE; 85395fa0405SHaiyang Zhang } 85495fa0405SHaiyang Zhang } else { 85595fa0405SHaiyang Zhang /* reset */ 85695fa0405SHaiyang Zhang if (bufferlen > NETVSC_PACKET_SIZE) { 85795fa0405SHaiyang Zhang kfree(buffer); 85895fa0405SHaiyang Zhang buffer = packet; 85995fa0405SHaiyang Zhang bufferlen = NETVSC_PACKET_SIZE; 86095fa0405SHaiyang Zhang } 86195fa0405SHaiyang Zhang 86295fa0405SHaiyang Zhang break; 86395fa0405SHaiyang Zhang } 86495fa0405SHaiyang Zhang } else if (ret == -ENOBUFS) { 86595fa0405SHaiyang Zhang /* Handle large packet */ 86695fa0405SHaiyang Zhang buffer = kmalloc(bytes_recvd, GFP_ATOMIC); 86795fa0405SHaiyang Zhang if (buffer == NULL) { 86895fa0405SHaiyang Zhang /* Try again next time around */ 86995fa0405SHaiyang Zhang netdev_err(ndev, 87095fa0405SHaiyang Zhang "unable to allocate buffer of size " 87195fa0405SHaiyang Zhang "(%d)!!\n", bytes_recvd); 87295fa0405SHaiyang Zhang break; 87395fa0405SHaiyang Zhang } 87495fa0405SHaiyang Zhang 87595fa0405SHaiyang Zhang bufferlen = bytes_recvd; 87695fa0405SHaiyang Zhang } 87795fa0405SHaiyang Zhang } while (1); 87895fa0405SHaiyang Zhang 87995fa0405SHaiyang Zhang out: 88095fa0405SHaiyang Zhang kfree(buffer); 88195fa0405SHaiyang Zhang return; 88295fa0405SHaiyang Zhang } 88395fa0405SHaiyang Zhang 88495fa0405SHaiyang Zhang /* 88595fa0405SHaiyang Zhang * netvsc_device_add - Callback when the device belonging to this 88695fa0405SHaiyang Zhang * driver is added 88795fa0405SHaiyang Zhang */ 88895fa0405SHaiyang Zhang int netvsc_device_add(struct hv_device *device, void *additional_info) 88995fa0405SHaiyang Zhang { 89095fa0405SHaiyang Zhang int ret = 0; 89195fa0405SHaiyang Zhang int i; 89295fa0405SHaiyang Zhang int ring_size = 89395fa0405SHaiyang Zhang ((struct netvsc_device_info *)additional_info)->ring_size; 89495fa0405SHaiyang Zhang struct netvsc_device *net_device; 89595fa0405SHaiyang Zhang struct hv_netvsc_packet *packet, *pos; 89695fa0405SHaiyang Zhang struct net_device *ndev; 89795fa0405SHaiyang Zhang 89895fa0405SHaiyang Zhang net_device = alloc_net_device(device); 89995fa0405SHaiyang Zhang if (!net_device) { 90095fa0405SHaiyang Zhang ret = -ENOMEM; 90195fa0405SHaiyang Zhang goto cleanup; 90295fa0405SHaiyang Zhang } 90395fa0405SHaiyang Zhang 90495fa0405SHaiyang Zhang /* 90595fa0405SHaiyang Zhang * Coming into this function, struct net_device * is 90695fa0405SHaiyang Zhang * registered as the driver private data. 90795fa0405SHaiyang Zhang * In alloc_net_device(), we register struct netvsc_device * 90895fa0405SHaiyang Zhang * as the driver private data and stash away struct net_device * 90995fa0405SHaiyang Zhang * in struct netvsc_device *. 91095fa0405SHaiyang Zhang */ 91195fa0405SHaiyang Zhang ndev = net_device->ndev; 91295fa0405SHaiyang Zhang 91395fa0405SHaiyang Zhang /* Initialize the NetVSC channel extension */ 91495fa0405SHaiyang Zhang net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; 91595fa0405SHaiyang Zhang spin_lock_init(&net_device->recv_pkt_list_lock); 91695fa0405SHaiyang Zhang 91795fa0405SHaiyang Zhang INIT_LIST_HEAD(&net_device->recv_pkt_list); 91895fa0405SHaiyang Zhang 91995fa0405SHaiyang Zhang for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) { 9206562640bSHaiyang Zhang packet = kzalloc(sizeof(struct hv_netvsc_packet), GFP_KERNEL); 92195fa0405SHaiyang Zhang if (!packet) 92295fa0405SHaiyang Zhang break; 92395fa0405SHaiyang Zhang 92495fa0405SHaiyang Zhang list_add_tail(&packet->list_ent, 92595fa0405SHaiyang Zhang &net_device->recv_pkt_list); 92695fa0405SHaiyang Zhang } 92795fa0405SHaiyang Zhang init_completion(&net_device->channel_init_wait); 92895fa0405SHaiyang Zhang 92995fa0405SHaiyang Zhang /* Open the channel */ 93095fa0405SHaiyang Zhang ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, 93195fa0405SHaiyang Zhang ring_size * PAGE_SIZE, NULL, 0, 93295fa0405SHaiyang Zhang netvsc_channel_cb, device); 93395fa0405SHaiyang Zhang 93495fa0405SHaiyang Zhang if (ret != 0) { 93595fa0405SHaiyang Zhang netdev_err(ndev, "unable to open channel: %d\n", ret); 93695fa0405SHaiyang Zhang goto cleanup; 93795fa0405SHaiyang Zhang } 93895fa0405SHaiyang Zhang 93995fa0405SHaiyang Zhang /* Channel is opened */ 94095fa0405SHaiyang Zhang pr_info("hv_netvsc channel opened successfully\n"); 94195fa0405SHaiyang Zhang 94295fa0405SHaiyang Zhang /* Connect with the NetVsp */ 94395fa0405SHaiyang Zhang ret = netvsc_connect_vsp(device); 94495fa0405SHaiyang Zhang if (ret != 0) { 94595fa0405SHaiyang Zhang netdev_err(ndev, 94695fa0405SHaiyang Zhang "unable to connect to NetVSP - %d\n", ret); 94795fa0405SHaiyang Zhang goto close; 94895fa0405SHaiyang Zhang } 94995fa0405SHaiyang Zhang 95095fa0405SHaiyang Zhang return ret; 95195fa0405SHaiyang Zhang 95295fa0405SHaiyang Zhang close: 95395fa0405SHaiyang Zhang /* Now, we can close the channel safely */ 95495fa0405SHaiyang Zhang vmbus_close(device->channel); 95595fa0405SHaiyang Zhang 95695fa0405SHaiyang Zhang cleanup: 95795fa0405SHaiyang Zhang 95895fa0405SHaiyang Zhang if (net_device) { 95995fa0405SHaiyang Zhang list_for_each_entry_safe(packet, pos, 96095fa0405SHaiyang Zhang &net_device->recv_pkt_list, 96195fa0405SHaiyang Zhang list_ent) { 96295fa0405SHaiyang Zhang list_del(&packet->list_ent); 96395fa0405SHaiyang Zhang kfree(packet); 96495fa0405SHaiyang Zhang } 96595fa0405SHaiyang Zhang 96695fa0405SHaiyang Zhang kfree(net_device); 96795fa0405SHaiyang Zhang } 96895fa0405SHaiyang Zhang 96995fa0405SHaiyang Zhang return ret; 97095fa0405SHaiyang Zhang } 971