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> 3195fa0405SHaiyang Zhang 3295fa0405SHaiyang Zhang #include "hyperv_net.h" 3395fa0405SHaiyang Zhang 3495fa0405SHaiyang Zhang 3595fa0405SHaiyang Zhang static struct netvsc_device *alloc_net_device(struct hv_device *device) 3695fa0405SHaiyang Zhang { 3795fa0405SHaiyang Zhang struct netvsc_device *net_device; 3895fa0405SHaiyang Zhang struct net_device *ndev = hv_get_drvdata(device); 3995fa0405SHaiyang Zhang 4095fa0405SHaiyang Zhang net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); 4195fa0405SHaiyang Zhang if (!net_device) 4295fa0405SHaiyang Zhang return NULL; 4395fa0405SHaiyang Zhang 44dc5cd894SHaiyang Zhang init_waitqueue_head(&net_device->wait_drain); 454d447c9aSHaiyang Zhang net_device->start_remove = false; 4695fa0405SHaiyang Zhang net_device->destroy = false; 4795fa0405SHaiyang Zhang net_device->dev = device; 4895fa0405SHaiyang Zhang net_device->ndev = ndev; 4995fa0405SHaiyang Zhang 5095fa0405SHaiyang Zhang hv_set_drvdata(device, net_device); 5195fa0405SHaiyang Zhang return net_device; 5295fa0405SHaiyang Zhang } 5395fa0405SHaiyang Zhang 5495fa0405SHaiyang Zhang static struct netvsc_device *get_outbound_net_device(struct hv_device *device) 5595fa0405SHaiyang Zhang { 5695fa0405SHaiyang Zhang struct netvsc_device *net_device; 5795fa0405SHaiyang Zhang 5895fa0405SHaiyang Zhang net_device = hv_get_drvdata(device); 5995fa0405SHaiyang Zhang if (net_device && net_device->destroy) 6095fa0405SHaiyang Zhang net_device = NULL; 6195fa0405SHaiyang Zhang 6295fa0405SHaiyang Zhang return net_device; 6395fa0405SHaiyang Zhang } 6495fa0405SHaiyang Zhang 6595fa0405SHaiyang Zhang static struct netvsc_device *get_inbound_net_device(struct hv_device *device) 6695fa0405SHaiyang Zhang { 6795fa0405SHaiyang Zhang struct netvsc_device *net_device; 6895fa0405SHaiyang Zhang 6995fa0405SHaiyang Zhang net_device = hv_get_drvdata(device); 7095fa0405SHaiyang Zhang 7195fa0405SHaiyang Zhang if (!net_device) 7295fa0405SHaiyang Zhang goto get_in_err; 7395fa0405SHaiyang Zhang 7495fa0405SHaiyang Zhang if (net_device->destroy && 7595fa0405SHaiyang Zhang atomic_read(&net_device->num_outstanding_sends) == 0) 7695fa0405SHaiyang Zhang net_device = NULL; 7795fa0405SHaiyang Zhang 7895fa0405SHaiyang Zhang get_in_err: 7995fa0405SHaiyang Zhang return net_device; 8095fa0405SHaiyang Zhang } 8195fa0405SHaiyang Zhang 8295fa0405SHaiyang Zhang 8395fa0405SHaiyang Zhang static int netvsc_destroy_recv_buf(struct netvsc_device *net_device) 8495fa0405SHaiyang Zhang { 8595fa0405SHaiyang Zhang struct nvsp_message *revoke_packet; 8695fa0405SHaiyang Zhang int ret = 0; 8795fa0405SHaiyang Zhang struct net_device *ndev = net_device->ndev; 8895fa0405SHaiyang Zhang 8995fa0405SHaiyang Zhang /* 9095fa0405SHaiyang Zhang * If we got a section count, it means we received a 9195fa0405SHaiyang Zhang * SendReceiveBufferComplete msg (ie sent 9295fa0405SHaiyang Zhang * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need 9395fa0405SHaiyang Zhang * to send a revoke msg here 9495fa0405SHaiyang Zhang */ 9595fa0405SHaiyang Zhang if (net_device->recv_section_cnt) { 9695fa0405SHaiyang Zhang /* Send the revoke receive buffer */ 9795fa0405SHaiyang Zhang revoke_packet = &net_device->revoke_packet; 9895fa0405SHaiyang Zhang memset(revoke_packet, 0, sizeof(struct nvsp_message)); 9995fa0405SHaiyang Zhang 10095fa0405SHaiyang Zhang revoke_packet->hdr.msg_type = 10195fa0405SHaiyang Zhang NVSP_MSG1_TYPE_REVOKE_RECV_BUF; 10295fa0405SHaiyang Zhang revoke_packet->msg.v1_msg. 10395fa0405SHaiyang Zhang revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 10495fa0405SHaiyang Zhang 10595fa0405SHaiyang Zhang ret = vmbus_sendpacket(net_device->dev->channel, 10695fa0405SHaiyang Zhang revoke_packet, 10795fa0405SHaiyang Zhang sizeof(struct nvsp_message), 10895fa0405SHaiyang Zhang (unsigned long)revoke_packet, 10995fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 0); 11095fa0405SHaiyang Zhang /* 11195fa0405SHaiyang Zhang * If we failed here, we might as well return and 11295fa0405SHaiyang Zhang * have a leak rather than continue and a bugchk 11395fa0405SHaiyang Zhang */ 11495fa0405SHaiyang Zhang if (ret != 0) { 11595fa0405SHaiyang Zhang netdev_err(ndev, "unable to send " 11695fa0405SHaiyang Zhang "revoke receive buffer to netvsp\n"); 11795fa0405SHaiyang Zhang return ret; 11895fa0405SHaiyang Zhang } 11995fa0405SHaiyang Zhang } 12095fa0405SHaiyang Zhang 12195fa0405SHaiyang Zhang /* Teardown the gpadl on the vsp end */ 12295fa0405SHaiyang Zhang if (net_device->recv_buf_gpadl_handle) { 12395fa0405SHaiyang Zhang ret = vmbus_teardown_gpadl(net_device->dev->channel, 12495fa0405SHaiyang Zhang net_device->recv_buf_gpadl_handle); 12595fa0405SHaiyang Zhang 12695fa0405SHaiyang Zhang /* If we failed here, we might as well return and have a leak 12795fa0405SHaiyang Zhang * rather than continue and a bugchk 12895fa0405SHaiyang Zhang */ 12995fa0405SHaiyang Zhang if (ret != 0) { 13095fa0405SHaiyang Zhang netdev_err(ndev, 13195fa0405SHaiyang Zhang "unable to teardown receive buffer's gpadl\n"); 13295fa0405SHaiyang Zhang return ret; 13395fa0405SHaiyang Zhang } 13495fa0405SHaiyang Zhang net_device->recv_buf_gpadl_handle = 0; 13595fa0405SHaiyang Zhang } 13695fa0405SHaiyang Zhang 13795fa0405SHaiyang Zhang if (net_device->recv_buf) { 13895fa0405SHaiyang Zhang /* Free up the receive buffer */ 139b679ef73SHaiyang Zhang vfree(net_device->recv_buf); 14095fa0405SHaiyang Zhang net_device->recv_buf = NULL; 14195fa0405SHaiyang Zhang } 14295fa0405SHaiyang Zhang 14395fa0405SHaiyang Zhang if (net_device->recv_section) { 14495fa0405SHaiyang Zhang net_device->recv_section_cnt = 0; 14595fa0405SHaiyang Zhang kfree(net_device->recv_section); 14695fa0405SHaiyang Zhang net_device->recv_section = NULL; 14795fa0405SHaiyang Zhang } 14895fa0405SHaiyang Zhang 14995fa0405SHaiyang Zhang return ret; 15095fa0405SHaiyang Zhang } 15195fa0405SHaiyang Zhang 15295fa0405SHaiyang Zhang static int netvsc_init_recv_buf(struct hv_device *device) 15395fa0405SHaiyang Zhang { 15495fa0405SHaiyang Zhang int ret = 0; 15595fa0405SHaiyang Zhang int t; 15695fa0405SHaiyang Zhang struct netvsc_device *net_device; 15795fa0405SHaiyang Zhang struct nvsp_message *init_packet; 15895fa0405SHaiyang Zhang struct net_device *ndev; 15995fa0405SHaiyang Zhang 16095fa0405SHaiyang Zhang net_device = get_outbound_net_device(device); 16195fa0405SHaiyang Zhang if (!net_device) 16295fa0405SHaiyang Zhang return -ENODEV; 16395fa0405SHaiyang Zhang ndev = net_device->ndev; 16495fa0405SHaiyang Zhang 165b679ef73SHaiyang Zhang net_device->recv_buf = vzalloc(net_device->recv_buf_size); 16695fa0405SHaiyang Zhang if (!net_device->recv_buf) { 16795fa0405SHaiyang Zhang netdev_err(ndev, "unable to allocate receive " 16895fa0405SHaiyang Zhang "buffer of size %d\n", net_device->recv_buf_size); 16995fa0405SHaiyang Zhang ret = -ENOMEM; 17095fa0405SHaiyang Zhang goto cleanup; 17195fa0405SHaiyang Zhang } 17295fa0405SHaiyang Zhang 17395fa0405SHaiyang Zhang /* 17495fa0405SHaiyang Zhang * Establish the gpadl handle for this buffer on this 17595fa0405SHaiyang Zhang * channel. Note: This call uses the vmbus connection rather 17695fa0405SHaiyang Zhang * than the channel to establish the gpadl handle. 17795fa0405SHaiyang Zhang */ 17895fa0405SHaiyang Zhang ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, 17995fa0405SHaiyang Zhang net_device->recv_buf_size, 18095fa0405SHaiyang Zhang &net_device->recv_buf_gpadl_handle); 18195fa0405SHaiyang Zhang if (ret != 0) { 18295fa0405SHaiyang Zhang netdev_err(ndev, 18395fa0405SHaiyang Zhang "unable to establish receive buffer's gpadl\n"); 18495fa0405SHaiyang Zhang goto cleanup; 18595fa0405SHaiyang Zhang } 18695fa0405SHaiyang Zhang 18795fa0405SHaiyang Zhang 18895fa0405SHaiyang Zhang /* Notify the NetVsp of the gpadl handle */ 18995fa0405SHaiyang Zhang init_packet = &net_device->channel_init_pkt; 19095fa0405SHaiyang Zhang 19195fa0405SHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 19295fa0405SHaiyang Zhang 19395fa0405SHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; 19495fa0405SHaiyang Zhang init_packet->msg.v1_msg.send_recv_buf. 19595fa0405SHaiyang Zhang gpadl_handle = net_device->recv_buf_gpadl_handle; 19695fa0405SHaiyang Zhang init_packet->msg.v1_msg. 19795fa0405SHaiyang Zhang send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 19895fa0405SHaiyang Zhang 19995fa0405SHaiyang Zhang /* Send the gpadl notification request */ 20095fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 20195fa0405SHaiyang Zhang sizeof(struct nvsp_message), 20295fa0405SHaiyang Zhang (unsigned long)init_packet, 20395fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 20495fa0405SHaiyang Zhang VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 20595fa0405SHaiyang Zhang if (ret != 0) { 20695fa0405SHaiyang Zhang netdev_err(ndev, 20795fa0405SHaiyang Zhang "unable to send receive buffer's gpadl to netvsp\n"); 20895fa0405SHaiyang Zhang goto cleanup; 20995fa0405SHaiyang Zhang } 21095fa0405SHaiyang Zhang 21195fa0405SHaiyang Zhang t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 21295fa0405SHaiyang Zhang BUG_ON(t == 0); 21395fa0405SHaiyang Zhang 21495fa0405SHaiyang Zhang 21595fa0405SHaiyang Zhang /* Check the response */ 21695fa0405SHaiyang Zhang if (init_packet->msg.v1_msg. 21795fa0405SHaiyang Zhang send_recv_buf_complete.status != NVSP_STAT_SUCCESS) { 21895fa0405SHaiyang Zhang netdev_err(ndev, "Unable to complete receive buffer " 21995fa0405SHaiyang Zhang "initialization with NetVsp - status %d\n", 22095fa0405SHaiyang Zhang init_packet->msg.v1_msg. 22195fa0405SHaiyang Zhang send_recv_buf_complete.status); 22295fa0405SHaiyang Zhang ret = -EINVAL; 22395fa0405SHaiyang Zhang goto cleanup; 22495fa0405SHaiyang Zhang } 22595fa0405SHaiyang Zhang 22695fa0405SHaiyang Zhang /* Parse the response */ 22795fa0405SHaiyang Zhang 22895fa0405SHaiyang Zhang net_device->recv_section_cnt = init_packet->msg. 22995fa0405SHaiyang Zhang v1_msg.send_recv_buf_complete.num_sections; 23095fa0405SHaiyang Zhang 231c1813200SHaiyang Zhang net_device->recv_section = kmemdup( 232c1813200SHaiyang Zhang init_packet->msg.v1_msg.send_recv_buf_complete.sections, 233c1813200SHaiyang Zhang net_device->recv_section_cnt * 234c1813200SHaiyang Zhang sizeof(struct nvsp_1_receive_buffer_section), 23595fa0405SHaiyang Zhang GFP_KERNEL); 23695fa0405SHaiyang Zhang if (net_device->recv_section == NULL) { 23795fa0405SHaiyang Zhang ret = -EINVAL; 23895fa0405SHaiyang Zhang goto cleanup; 23995fa0405SHaiyang Zhang } 24095fa0405SHaiyang Zhang 24195fa0405SHaiyang Zhang /* 24295fa0405SHaiyang Zhang * For 1st release, there should only be 1 section that represents the 24395fa0405SHaiyang Zhang * entire receive buffer 24495fa0405SHaiyang Zhang */ 24595fa0405SHaiyang Zhang if (net_device->recv_section_cnt != 1 || 24695fa0405SHaiyang Zhang net_device->recv_section->offset != 0) { 24795fa0405SHaiyang Zhang ret = -EINVAL; 24895fa0405SHaiyang Zhang goto cleanup; 24995fa0405SHaiyang Zhang } 25095fa0405SHaiyang Zhang 25195fa0405SHaiyang Zhang goto exit; 25295fa0405SHaiyang Zhang 25395fa0405SHaiyang Zhang cleanup: 25495fa0405SHaiyang Zhang netvsc_destroy_recv_buf(net_device); 25595fa0405SHaiyang Zhang 25695fa0405SHaiyang Zhang exit: 25795fa0405SHaiyang Zhang return ret; 25895fa0405SHaiyang Zhang } 25995fa0405SHaiyang Zhang 26095fa0405SHaiyang Zhang 261f157e78dSHaiyang Zhang /* Negotiate NVSP protocol version */ 262f157e78dSHaiyang Zhang static int negotiate_nvsp_ver(struct hv_device *device, 263f157e78dSHaiyang Zhang struct netvsc_device *net_device, 264f157e78dSHaiyang Zhang struct nvsp_message *init_packet, 265f157e78dSHaiyang Zhang u32 nvsp_ver) 26695fa0405SHaiyang Zhang { 26795fa0405SHaiyang Zhang int ret, t; 268f157e78dSHaiyang Zhang 269f157e78dSHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 270f157e78dSHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; 271f157e78dSHaiyang Zhang init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; 272f157e78dSHaiyang Zhang init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; 273f157e78dSHaiyang Zhang 274f157e78dSHaiyang Zhang /* Send the init request */ 275f157e78dSHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 276f157e78dSHaiyang Zhang sizeof(struct nvsp_message), 277f157e78dSHaiyang Zhang (unsigned long)init_packet, 278f157e78dSHaiyang Zhang VM_PKT_DATA_INBAND, 279f157e78dSHaiyang Zhang VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 280f157e78dSHaiyang Zhang 281f157e78dSHaiyang Zhang if (ret != 0) 282f157e78dSHaiyang Zhang return ret; 283f157e78dSHaiyang Zhang 284f157e78dSHaiyang Zhang t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 285f157e78dSHaiyang Zhang 286f157e78dSHaiyang Zhang if (t == 0) 287f157e78dSHaiyang Zhang return -ETIMEDOUT; 288f157e78dSHaiyang Zhang 289f157e78dSHaiyang Zhang if (init_packet->msg.init_msg.init_complete.status != 290f157e78dSHaiyang Zhang NVSP_STAT_SUCCESS) 291f157e78dSHaiyang Zhang return -EINVAL; 292f157e78dSHaiyang Zhang 293f157e78dSHaiyang Zhang if (nvsp_ver != NVSP_PROTOCOL_VERSION_2) 294f157e78dSHaiyang Zhang return 0; 295f157e78dSHaiyang Zhang 296f157e78dSHaiyang Zhang /* NVSPv2 only: Send NDIS config */ 297f157e78dSHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 298f157e78dSHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; 2994d447c9aSHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu; 3001f5f3a75SHaiyang Zhang init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; 301f157e78dSHaiyang Zhang 302f157e78dSHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 303f157e78dSHaiyang Zhang sizeof(struct nvsp_message), 304f157e78dSHaiyang Zhang (unsigned long)init_packet, 305f157e78dSHaiyang Zhang VM_PKT_DATA_INBAND, 0); 306f157e78dSHaiyang Zhang 307f157e78dSHaiyang Zhang return ret; 308f157e78dSHaiyang Zhang } 309f157e78dSHaiyang Zhang 310f157e78dSHaiyang Zhang static int netvsc_connect_vsp(struct hv_device *device) 311f157e78dSHaiyang Zhang { 312f157e78dSHaiyang Zhang int ret; 31395fa0405SHaiyang Zhang struct netvsc_device *net_device; 31495fa0405SHaiyang Zhang struct nvsp_message *init_packet; 31595fa0405SHaiyang Zhang int ndis_version; 31695fa0405SHaiyang Zhang struct net_device *ndev; 31795fa0405SHaiyang Zhang 31895fa0405SHaiyang Zhang net_device = get_outbound_net_device(device); 31995fa0405SHaiyang Zhang if (!net_device) 32095fa0405SHaiyang Zhang return -ENODEV; 32195fa0405SHaiyang Zhang ndev = net_device->ndev; 32295fa0405SHaiyang Zhang 32395fa0405SHaiyang Zhang init_packet = &net_device->channel_init_pkt; 32495fa0405SHaiyang Zhang 325f157e78dSHaiyang Zhang /* Negotiate the latest NVSP protocol supported */ 326f157e78dSHaiyang Zhang if (negotiate_nvsp_ver(device, net_device, init_packet, 327f157e78dSHaiyang Zhang NVSP_PROTOCOL_VERSION_2) == 0) { 328f157e78dSHaiyang Zhang net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2; 329f157e78dSHaiyang Zhang } else if (negotiate_nvsp_ver(device, net_device, init_packet, 330f157e78dSHaiyang Zhang NVSP_PROTOCOL_VERSION_1) == 0) { 331f157e78dSHaiyang Zhang net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1; 332f157e78dSHaiyang Zhang } else { 33395fa0405SHaiyang Zhang ret = -EPROTO; 33495fa0405SHaiyang Zhang goto cleanup; 33595fa0405SHaiyang Zhang } 336f157e78dSHaiyang Zhang 337f157e78dSHaiyang Zhang pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); 338f157e78dSHaiyang Zhang 33995fa0405SHaiyang Zhang /* Send the ndis version */ 34095fa0405SHaiyang Zhang memset(init_packet, 0, sizeof(struct nvsp_message)); 34195fa0405SHaiyang Zhang 3421f5f3a75SHaiyang Zhang ndis_version = 0x00050001; 34395fa0405SHaiyang Zhang 34495fa0405SHaiyang Zhang init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; 34595fa0405SHaiyang Zhang init_packet->msg.v1_msg. 34695fa0405SHaiyang Zhang send_ndis_ver.ndis_major_ver = 34795fa0405SHaiyang Zhang (ndis_version & 0xFFFF0000) >> 16; 34895fa0405SHaiyang Zhang init_packet->msg.v1_msg. 34995fa0405SHaiyang Zhang send_ndis_ver.ndis_minor_ver = 35095fa0405SHaiyang Zhang ndis_version & 0xFFFF; 35195fa0405SHaiyang Zhang 35295fa0405SHaiyang Zhang /* Send the init request */ 35395fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, init_packet, 35495fa0405SHaiyang Zhang sizeof(struct nvsp_message), 35595fa0405SHaiyang Zhang (unsigned long)init_packet, 35695fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 0); 35795fa0405SHaiyang Zhang if (ret != 0) 35895fa0405SHaiyang Zhang goto cleanup; 35995fa0405SHaiyang Zhang 36095fa0405SHaiyang Zhang /* Post the big receive buffer to NetVSP */ 36195fa0405SHaiyang Zhang ret = netvsc_init_recv_buf(device); 36295fa0405SHaiyang Zhang 36395fa0405SHaiyang Zhang cleanup: 36495fa0405SHaiyang Zhang return ret; 36595fa0405SHaiyang Zhang } 36695fa0405SHaiyang Zhang 36795fa0405SHaiyang Zhang static void netvsc_disconnect_vsp(struct netvsc_device *net_device) 36895fa0405SHaiyang Zhang { 36995fa0405SHaiyang Zhang netvsc_destroy_recv_buf(net_device); 37095fa0405SHaiyang Zhang } 37195fa0405SHaiyang Zhang 37295fa0405SHaiyang Zhang /* 37395fa0405SHaiyang Zhang * netvsc_device_remove - Callback when the root bus device is removed 37495fa0405SHaiyang Zhang */ 37595fa0405SHaiyang Zhang int netvsc_device_remove(struct hv_device *device) 37695fa0405SHaiyang Zhang { 37795fa0405SHaiyang Zhang struct netvsc_device *net_device; 37895fa0405SHaiyang Zhang struct hv_netvsc_packet *netvsc_packet, *pos; 37995fa0405SHaiyang Zhang unsigned long flags; 38095fa0405SHaiyang Zhang 38195fa0405SHaiyang Zhang net_device = hv_get_drvdata(device); 38295fa0405SHaiyang Zhang 38395fa0405SHaiyang Zhang netvsc_disconnect_vsp(net_device); 38495fa0405SHaiyang Zhang 38595fa0405SHaiyang Zhang /* 38695fa0405SHaiyang Zhang * Since we have already drained, we don't need to busy wait 38795fa0405SHaiyang Zhang * as was done in final_release_stor_device() 38895fa0405SHaiyang Zhang * Note that we cannot set the ext pointer to NULL until 38995fa0405SHaiyang Zhang * we have drained - to drain the outgoing packets, we need to 39095fa0405SHaiyang Zhang * allow incoming packets. 39195fa0405SHaiyang Zhang */ 39295fa0405SHaiyang Zhang 39395fa0405SHaiyang Zhang spin_lock_irqsave(&device->channel->inbound_lock, flags); 39495fa0405SHaiyang Zhang hv_set_drvdata(device, NULL); 39595fa0405SHaiyang Zhang spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 39695fa0405SHaiyang Zhang 39795fa0405SHaiyang Zhang /* 39895fa0405SHaiyang Zhang * At this point, no one should be accessing net_device 39995fa0405SHaiyang Zhang * except in here 40095fa0405SHaiyang Zhang */ 40195fa0405SHaiyang Zhang dev_notice(&device->device, "net device safe to remove\n"); 40295fa0405SHaiyang Zhang 40395fa0405SHaiyang Zhang /* Now, we can close the channel safely */ 40495fa0405SHaiyang Zhang vmbus_close(device->channel); 40595fa0405SHaiyang Zhang 40695fa0405SHaiyang Zhang /* Release all resources */ 40795fa0405SHaiyang Zhang list_for_each_entry_safe(netvsc_packet, pos, 40895fa0405SHaiyang Zhang &net_device->recv_pkt_list, list_ent) { 40995fa0405SHaiyang Zhang list_del(&netvsc_packet->list_ent); 41095fa0405SHaiyang Zhang kfree(netvsc_packet); 41195fa0405SHaiyang Zhang } 41295fa0405SHaiyang Zhang 41395fa0405SHaiyang Zhang kfree(net_device); 41495fa0405SHaiyang Zhang return 0; 41595fa0405SHaiyang Zhang } 41695fa0405SHaiyang Zhang 41733be96e4SHaiyang Zhang 41833be96e4SHaiyang Zhang #define RING_AVAIL_PERCENT_HIWATER 20 41933be96e4SHaiyang Zhang #define RING_AVAIL_PERCENT_LOWATER 10 42033be96e4SHaiyang Zhang 42133be96e4SHaiyang Zhang /* 42233be96e4SHaiyang Zhang * Get the percentage of available bytes to write in the ring. 42333be96e4SHaiyang Zhang * The return value is in range from 0 to 100. 42433be96e4SHaiyang Zhang */ 42533be96e4SHaiyang Zhang static inline u32 hv_ringbuf_avail_percent( 42633be96e4SHaiyang Zhang struct hv_ring_buffer_info *ring_info) 42733be96e4SHaiyang Zhang { 42833be96e4SHaiyang Zhang u32 avail_read, avail_write; 42933be96e4SHaiyang Zhang 43033be96e4SHaiyang Zhang hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); 43133be96e4SHaiyang Zhang 43233be96e4SHaiyang Zhang return avail_write * 100 / ring_info->ring_datasize; 43333be96e4SHaiyang Zhang } 43433be96e4SHaiyang Zhang 43597c1723aSKY Srinivasan static void netvsc_send_completion(struct netvsc_device *net_device, 43697c1723aSKY Srinivasan struct hv_device *device, 43795fa0405SHaiyang Zhang struct vmpacket_descriptor *packet) 43895fa0405SHaiyang Zhang { 43995fa0405SHaiyang Zhang struct nvsp_message *nvsp_packet; 44095fa0405SHaiyang Zhang struct hv_netvsc_packet *nvsc_packet; 44195fa0405SHaiyang Zhang struct net_device *ndev; 44295fa0405SHaiyang Zhang 44395fa0405SHaiyang Zhang ndev = net_device->ndev; 44495fa0405SHaiyang Zhang 44595fa0405SHaiyang Zhang nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 44695fa0405SHaiyang Zhang (packet->offset8 << 3)); 44795fa0405SHaiyang Zhang 44895fa0405SHaiyang Zhang if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) || 44995fa0405SHaiyang Zhang (nvsp_packet->hdr.msg_type == 45095fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) || 45195fa0405SHaiyang Zhang (nvsp_packet->hdr.msg_type == 45295fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) { 45395fa0405SHaiyang Zhang /* Copy the response back */ 45495fa0405SHaiyang Zhang memcpy(&net_device->channel_init_pkt, nvsp_packet, 45595fa0405SHaiyang Zhang sizeof(struct nvsp_message)); 45695fa0405SHaiyang Zhang complete(&net_device->channel_init_wait); 45795fa0405SHaiyang Zhang } else if (nvsp_packet->hdr.msg_type == 45895fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) { 45933be96e4SHaiyang Zhang int num_outstanding_sends; 46033be96e4SHaiyang Zhang 46195fa0405SHaiyang Zhang /* Get the send context */ 46295fa0405SHaiyang Zhang nvsc_packet = (struct hv_netvsc_packet *)(unsigned long) 46395fa0405SHaiyang Zhang packet->trans_id; 46495fa0405SHaiyang Zhang 46595fa0405SHaiyang Zhang /* Notify the layer above us */ 466f1ea3cd7SHaiyang Zhang if (nvsc_packet) 46795fa0405SHaiyang Zhang nvsc_packet->completion.send.send_completion( 468f1ea3cd7SHaiyang Zhang nvsc_packet->completion.send. 469f1ea3cd7SHaiyang Zhang send_completion_ctx); 47095fa0405SHaiyang Zhang 47133be96e4SHaiyang Zhang num_outstanding_sends = 47233be96e4SHaiyang Zhang atomic_dec_return(&net_device->num_outstanding_sends); 4731d06825bSHaiyang Zhang 474dc5cd894SHaiyang Zhang if (net_device->destroy && num_outstanding_sends == 0) 475dc5cd894SHaiyang Zhang wake_up(&net_device->wait_drain); 476dc5cd894SHaiyang Zhang 47733be96e4SHaiyang Zhang if (netif_queue_stopped(ndev) && !net_device->start_remove && 47833be96e4SHaiyang Zhang (hv_ringbuf_avail_percent(&device->channel->outbound) 47933be96e4SHaiyang Zhang > RING_AVAIL_PERCENT_HIWATER || 48033be96e4SHaiyang Zhang num_outstanding_sends < 1)) 4811d06825bSHaiyang Zhang netif_wake_queue(ndev); 48295fa0405SHaiyang Zhang } else { 48395fa0405SHaiyang Zhang netdev_err(ndev, "Unknown send completion packet type- " 48495fa0405SHaiyang Zhang "%d received!!\n", nvsp_packet->hdr.msg_type); 48595fa0405SHaiyang Zhang } 48695fa0405SHaiyang Zhang 48795fa0405SHaiyang Zhang } 48895fa0405SHaiyang Zhang 48995fa0405SHaiyang Zhang int netvsc_send(struct hv_device *device, 49095fa0405SHaiyang Zhang struct hv_netvsc_packet *packet) 49195fa0405SHaiyang Zhang { 49295fa0405SHaiyang Zhang struct netvsc_device *net_device; 49395fa0405SHaiyang Zhang int ret = 0; 49495fa0405SHaiyang Zhang struct nvsp_message sendMessage; 49595fa0405SHaiyang Zhang struct net_device *ndev; 496f1ea3cd7SHaiyang Zhang u64 req_id; 49795fa0405SHaiyang Zhang 49895fa0405SHaiyang Zhang net_device = get_outbound_net_device(device); 49995fa0405SHaiyang Zhang if (!net_device) 50095fa0405SHaiyang Zhang return -ENODEV; 50195fa0405SHaiyang Zhang ndev = net_device->ndev; 50295fa0405SHaiyang Zhang 50395fa0405SHaiyang Zhang sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; 50495fa0405SHaiyang Zhang if (packet->is_data_pkt) { 50595fa0405SHaiyang Zhang /* 0 is RMC_DATA; */ 50695fa0405SHaiyang Zhang sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0; 50795fa0405SHaiyang Zhang } else { 50895fa0405SHaiyang Zhang /* 1 is RMC_CONTROL; */ 50995fa0405SHaiyang Zhang sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1; 51095fa0405SHaiyang Zhang } 51195fa0405SHaiyang Zhang 51295fa0405SHaiyang Zhang /* Not using send buffer section */ 51395fa0405SHaiyang Zhang sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index = 51495fa0405SHaiyang Zhang 0xFFFFFFFF; 51595fa0405SHaiyang Zhang sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; 51695fa0405SHaiyang Zhang 517f1ea3cd7SHaiyang Zhang if (packet->completion.send.send_completion) 51800ca8f0cSHaiyang Zhang req_id = (ulong)packet; 519f1ea3cd7SHaiyang Zhang else 520f1ea3cd7SHaiyang Zhang req_id = 0; 521f1ea3cd7SHaiyang Zhang 52295fa0405SHaiyang Zhang if (packet->page_buf_cnt) { 52395fa0405SHaiyang Zhang ret = vmbus_sendpacket_pagebuffer(device->channel, 52495fa0405SHaiyang Zhang packet->page_buf, 52595fa0405SHaiyang Zhang packet->page_buf_cnt, 52695fa0405SHaiyang Zhang &sendMessage, 52795fa0405SHaiyang Zhang sizeof(struct nvsp_message), 528f1ea3cd7SHaiyang Zhang req_id); 52995fa0405SHaiyang Zhang } else { 53095fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, &sendMessage, 53195fa0405SHaiyang Zhang sizeof(struct nvsp_message), 532f1ea3cd7SHaiyang Zhang req_id, 53395fa0405SHaiyang Zhang VM_PKT_DATA_INBAND, 53495fa0405SHaiyang Zhang VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 53595fa0405SHaiyang Zhang } 53695fa0405SHaiyang Zhang 5371d06825bSHaiyang Zhang if (ret == 0) { 5381d06825bSHaiyang Zhang atomic_inc(&net_device->num_outstanding_sends); 53933be96e4SHaiyang Zhang if (hv_ringbuf_avail_percent(&device->channel->outbound) < 54033be96e4SHaiyang Zhang RING_AVAIL_PERCENT_LOWATER) { 54133be96e4SHaiyang Zhang netif_stop_queue(ndev); 54233be96e4SHaiyang Zhang if (atomic_read(&net_device-> 54333be96e4SHaiyang Zhang num_outstanding_sends) < 1) 54433be96e4SHaiyang Zhang netif_wake_queue(ndev); 54533be96e4SHaiyang Zhang } 5461d06825bSHaiyang Zhang } else if (ret == -EAGAIN) { 5471d06825bSHaiyang Zhang netif_stop_queue(ndev); 54833be96e4SHaiyang Zhang if (atomic_read(&net_device->num_outstanding_sends) < 1) { 5491d06825bSHaiyang Zhang netif_wake_queue(ndev); 55033be96e4SHaiyang Zhang ret = -ENOSPC; 55133be96e4SHaiyang Zhang } 5521d06825bSHaiyang Zhang } else { 55395fa0405SHaiyang Zhang netdev_err(ndev, "Unable to send packet %p ret %d\n", 55495fa0405SHaiyang Zhang packet, ret); 5551d06825bSHaiyang Zhang } 55695fa0405SHaiyang Zhang 55795fa0405SHaiyang Zhang return ret; 55895fa0405SHaiyang Zhang } 55995fa0405SHaiyang Zhang 56095fa0405SHaiyang Zhang static void netvsc_send_recv_completion(struct hv_device *device, 56197c1723aSKY Srinivasan struct netvsc_device *net_device, 56263f6921dSHaiyang Zhang u64 transaction_id, u32 status) 56395fa0405SHaiyang Zhang { 56495fa0405SHaiyang Zhang struct nvsp_message recvcompMessage; 56595fa0405SHaiyang Zhang int retries = 0; 56695fa0405SHaiyang Zhang int ret; 56795fa0405SHaiyang Zhang struct net_device *ndev; 56895fa0405SHaiyang Zhang 56995fa0405SHaiyang Zhang ndev = net_device->ndev; 57095fa0405SHaiyang Zhang 57195fa0405SHaiyang Zhang recvcompMessage.hdr.msg_type = 57295fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; 57395fa0405SHaiyang Zhang 57463f6921dSHaiyang Zhang recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status; 57595fa0405SHaiyang Zhang 57695fa0405SHaiyang Zhang retry_send_cmplt: 57795fa0405SHaiyang Zhang /* Send the completion */ 57895fa0405SHaiyang Zhang ret = vmbus_sendpacket(device->channel, &recvcompMessage, 57995fa0405SHaiyang Zhang sizeof(struct nvsp_message), transaction_id, 58095fa0405SHaiyang Zhang VM_PKT_COMP, 0); 58195fa0405SHaiyang Zhang if (ret == 0) { 58295fa0405SHaiyang Zhang /* success */ 58395fa0405SHaiyang Zhang /* no-op */ 58495fa0405SHaiyang Zhang } else if (ret == -EAGAIN) { 58595fa0405SHaiyang Zhang /* no more room...wait a bit and attempt to retry 3 times */ 58695fa0405SHaiyang Zhang retries++; 58795fa0405SHaiyang Zhang netdev_err(ndev, "unable to send receive completion pkt" 58895fa0405SHaiyang Zhang " (tid %llx)...retrying %d\n", transaction_id, retries); 58995fa0405SHaiyang Zhang 59095fa0405SHaiyang Zhang if (retries < 4) { 59195fa0405SHaiyang Zhang udelay(100); 59295fa0405SHaiyang Zhang goto retry_send_cmplt; 59395fa0405SHaiyang Zhang } else { 59495fa0405SHaiyang Zhang netdev_err(ndev, "unable to send receive " 59595fa0405SHaiyang Zhang "completion pkt (tid %llx)...give up retrying\n", 59695fa0405SHaiyang Zhang transaction_id); 59795fa0405SHaiyang Zhang } 59895fa0405SHaiyang Zhang } else { 59995fa0405SHaiyang Zhang netdev_err(ndev, "unable to send receive " 60095fa0405SHaiyang Zhang "completion pkt - %llx\n", transaction_id); 60195fa0405SHaiyang Zhang } 60295fa0405SHaiyang Zhang } 60395fa0405SHaiyang Zhang 60495fa0405SHaiyang Zhang /* Send a receive completion packet to RNDIS device (ie NetVsp) */ 60595fa0405SHaiyang Zhang static void netvsc_receive_completion(void *context) 60695fa0405SHaiyang Zhang { 60795fa0405SHaiyang Zhang struct hv_netvsc_packet *packet = context; 608c2fd03a0SJoe Perches struct hv_device *device = packet->device; 60995fa0405SHaiyang Zhang struct netvsc_device *net_device; 61095fa0405SHaiyang Zhang u64 transaction_id = 0; 61195fa0405SHaiyang Zhang bool fsend_receive_comp = false; 61295fa0405SHaiyang Zhang unsigned long flags; 61395fa0405SHaiyang Zhang struct net_device *ndev; 61463f6921dSHaiyang Zhang u32 status = NVSP_STAT_NONE; 61595fa0405SHaiyang Zhang 61695fa0405SHaiyang Zhang /* 61795fa0405SHaiyang Zhang * Even though it seems logical to do a GetOutboundNetDevice() here to 61895fa0405SHaiyang Zhang * send out receive completion, we are using GetInboundNetDevice() 61995fa0405SHaiyang Zhang * since we may have disable outbound traffic already. 62095fa0405SHaiyang Zhang */ 62195fa0405SHaiyang Zhang net_device = get_inbound_net_device(device); 62295fa0405SHaiyang Zhang if (!net_device) 62395fa0405SHaiyang Zhang return; 62495fa0405SHaiyang Zhang ndev = net_device->ndev; 62595fa0405SHaiyang Zhang 62695fa0405SHaiyang Zhang /* Overloading use of the lock. */ 62795fa0405SHaiyang Zhang spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 62895fa0405SHaiyang Zhang 62963f6921dSHaiyang Zhang if (packet->status != NVSP_STAT_SUCCESS) 63063f6921dSHaiyang Zhang packet->xfer_page_pkt->status = NVSP_STAT_FAIL; 63163f6921dSHaiyang Zhang 63295fa0405SHaiyang Zhang packet->xfer_page_pkt->count--; 63395fa0405SHaiyang Zhang 63495fa0405SHaiyang Zhang /* 63595fa0405SHaiyang Zhang * Last one in the line that represent 1 xfer page packet. 63695fa0405SHaiyang Zhang * Return the xfer page packet itself to the freelist 63795fa0405SHaiyang Zhang */ 63895fa0405SHaiyang Zhang if (packet->xfer_page_pkt->count == 0) { 63995fa0405SHaiyang Zhang fsend_receive_comp = true; 64095fa0405SHaiyang Zhang transaction_id = packet->completion.recv.recv_completion_tid; 64163f6921dSHaiyang Zhang status = packet->xfer_page_pkt->status; 64295fa0405SHaiyang Zhang list_add_tail(&packet->xfer_page_pkt->list_ent, 64395fa0405SHaiyang Zhang &net_device->recv_pkt_list); 64495fa0405SHaiyang Zhang 64595fa0405SHaiyang Zhang } 64695fa0405SHaiyang Zhang 64795fa0405SHaiyang Zhang /* Put the packet back */ 64895fa0405SHaiyang Zhang list_add_tail(&packet->list_ent, &net_device->recv_pkt_list); 64995fa0405SHaiyang Zhang spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); 65095fa0405SHaiyang Zhang 65195fa0405SHaiyang Zhang /* Send a receive completion for the xfer page packet */ 65295fa0405SHaiyang Zhang if (fsend_receive_comp) 65397c1723aSKY Srinivasan netvsc_send_recv_completion(device, net_device, transaction_id, 65497c1723aSKY Srinivasan status); 65595fa0405SHaiyang Zhang 65695fa0405SHaiyang Zhang } 65795fa0405SHaiyang Zhang 65897c1723aSKY Srinivasan static void netvsc_receive(struct netvsc_device *net_device, 65997c1723aSKY Srinivasan struct hv_device *device, 66095fa0405SHaiyang Zhang struct vmpacket_descriptor *packet) 66195fa0405SHaiyang Zhang { 66295fa0405SHaiyang Zhang struct vmtransfer_page_packet_header *vmxferpage_packet; 66395fa0405SHaiyang Zhang struct nvsp_message *nvsp_packet; 66495fa0405SHaiyang Zhang struct hv_netvsc_packet *netvsc_packet = NULL; 66595fa0405SHaiyang Zhang /* struct netvsc_driver *netvscDriver; */ 66695fa0405SHaiyang Zhang struct xferpage_packet *xferpage_packet = NULL; 66745326342SHaiyang Zhang int i; 66845326342SHaiyang Zhang int count = 0; 66995fa0405SHaiyang Zhang unsigned long flags; 67095fa0405SHaiyang Zhang struct net_device *ndev; 67195fa0405SHaiyang Zhang 67295fa0405SHaiyang Zhang LIST_HEAD(listHead); 67395fa0405SHaiyang Zhang 67495fa0405SHaiyang Zhang ndev = net_device->ndev; 67595fa0405SHaiyang Zhang 67695fa0405SHaiyang Zhang /* 67795fa0405SHaiyang Zhang * All inbound packets other than send completion should be xfer page 67895fa0405SHaiyang Zhang * packet 67995fa0405SHaiyang Zhang */ 68095fa0405SHaiyang Zhang if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { 68195fa0405SHaiyang Zhang netdev_err(ndev, "Unknown packet type received - %d\n", 68295fa0405SHaiyang Zhang packet->type); 68395fa0405SHaiyang Zhang return; 68495fa0405SHaiyang Zhang } 68595fa0405SHaiyang Zhang 68695fa0405SHaiyang Zhang nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 68795fa0405SHaiyang Zhang (packet->offset8 << 3)); 68895fa0405SHaiyang Zhang 68995fa0405SHaiyang Zhang /* Make sure this is a valid nvsp packet */ 69095fa0405SHaiyang Zhang if (nvsp_packet->hdr.msg_type != 69195fa0405SHaiyang Zhang NVSP_MSG1_TYPE_SEND_RNDIS_PKT) { 69295fa0405SHaiyang Zhang netdev_err(ndev, "Unknown nvsp packet type received-" 69395fa0405SHaiyang Zhang " %d\n", nvsp_packet->hdr.msg_type); 69495fa0405SHaiyang Zhang return; 69595fa0405SHaiyang Zhang } 69695fa0405SHaiyang Zhang 69795fa0405SHaiyang Zhang vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; 69895fa0405SHaiyang Zhang 69995fa0405SHaiyang Zhang if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { 70095fa0405SHaiyang Zhang netdev_err(ndev, "Invalid xfer page set id - " 70195fa0405SHaiyang Zhang "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID, 70295fa0405SHaiyang Zhang vmxferpage_packet->xfer_pageset_id); 70395fa0405SHaiyang Zhang return; 70495fa0405SHaiyang Zhang } 70595fa0405SHaiyang Zhang 70695fa0405SHaiyang Zhang /* 70795fa0405SHaiyang Zhang * Grab free packets (range count + 1) to represent this xfer 70895fa0405SHaiyang Zhang * page packet. +1 to represent the xfer page packet itself. 70995fa0405SHaiyang Zhang * We grab it here so that we know exactly how many we can 71095fa0405SHaiyang Zhang * fulfil 71195fa0405SHaiyang Zhang */ 71295fa0405SHaiyang Zhang spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 71395fa0405SHaiyang Zhang while (!list_empty(&net_device->recv_pkt_list)) { 71495fa0405SHaiyang Zhang list_move_tail(net_device->recv_pkt_list.next, &listHead); 71595fa0405SHaiyang Zhang if (++count == vmxferpage_packet->range_cnt + 1) 71695fa0405SHaiyang Zhang break; 71795fa0405SHaiyang Zhang } 71895fa0405SHaiyang Zhang spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); 71995fa0405SHaiyang Zhang 72095fa0405SHaiyang Zhang /* 72195fa0405SHaiyang Zhang * We need at least 2 netvsc pkts (1 to represent the xfer 72295fa0405SHaiyang Zhang * page and at least 1 for the range) i.e. we can handled 72395fa0405SHaiyang Zhang * some of the xfer page packet ranges... 72495fa0405SHaiyang Zhang */ 72595fa0405SHaiyang Zhang if (count < 2) { 72695fa0405SHaiyang Zhang netdev_err(ndev, "Got only %d netvsc pkt...needed " 72795fa0405SHaiyang Zhang "%d pkts. Dropping this xfer page packet completely!\n", 72895fa0405SHaiyang Zhang count, vmxferpage_packet->range_cnt + 1); 72995fa0405SHaiyang Zhang 73095fa0405SHaiyang Zhang /* Return it to the freelist */ 73195fa0405SHaiyang Zhang spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 73295fa0405SHaiyang Zhang for (i = count; i != 0; i--) { 73395fa0405SHaiyang Zhang list_move_tail(listHead.next, 73495fa0405SHaiyang Zhang &net_device->recv_pkt_list); 73595fa0405SHaiyang Zhang } 73695fa0405SHaiyang Zhang spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, 73795fa0405SHaiyang Zhang flags); 73895fa0405SHaiyang Zhang 73997c1723aSKY Srinivasan netvsc_send_recv_completion(device, net_device, 74063f6921dSHaiyang Zhang vmxferpage_packet->d.trans_id, 74163f6921dSHaiyang Zhang NVSP_STAT_FAIL); 74295fa0405SHaiyang Zhang 74395fa0405SHaiyang Zhang return; 74495fa0405SHaiyang Zhang } 74595fa0405SHaiyang Zhang 74695fa0405SHaiyang Zhang /* Remove the 1st packet to represent the xfer page packet itself */ 74795fa0405SHaiyang Zhang xferpage_packet = (struct xferpage_packet *)listHead.next; 74895fa0405SHaiyang Zhang list_del(&xferpage_packet->list_ent); 74963f6921dSHaiyang Zhang xferpage_packet->status = NVSP_STAT_SUCCESS; 75095fa0405SHaiyang Zhang 75195fa0405SHaiyang Zhang /* This is how much we can satisfy */ 75295fa0405SHaiyang Zhang xferpage_packet->count = count - 1; 75395fa0405SHaiyang Zhang 75495fa0405SHaiyang Zhang if (xferpage_packet->count != vmxferpage_packet->range_cnt) { 75595fa0405SHaiyang Zhang netdev_err(ndev, "Needed %d netvsc pkts to satisfy " 75695fa0405SHaiyang Zhang "this xfer page...got %d\n", 75795fa0405SHaiyang Zhang vmxferpage_packet->range_cnt, xferpage_packet->count); 75895fa0405SHaiyang Zhang } 75995fa0405SHaiyang Zhang 76095fa0405SHaiyang Zhang /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ 76195fa0405SHaiyang Zhang for (i = 0; i < (count - 1); i++) { 76295fa0405SHaiyang Zhang netvsc_packet = (struct hv_netvsc_packet *)listHead.next; 76395fa0405SHaiyang Zhang list_del(&netvsc_packet->list_ent); 76495fa0405SHaiyang Zhang 76595fa0405SHaiyang Zhang /* Initialize the netvsc packet */ 76663f6921dSHaiyang Zhang netvsc_packet->status = NVSP_STAT_SUCCESS; 76795fa0405SHaiyang Zhang netvsc_packet->xfer_page_pkt = xferpage_packet; 76895fa0405SHaiyang Zhang netvsc_packet->completion.recv.recv_completion = 76995fa0405SHaiyang Zhang netvsc_receive_completion; 77095fa0405SHaiyang Zhang netvsc_packet->completion.recv.recv_completion_ctx = 77195fa0405SHaiyang Zhang netvsc_packet; 77295fa0405SHaiyang Zhang netvsc_packet->device = device; 77395fa0405SHaiyang Zhang /* Save this so that we can send it back */ 77495fa0405SHaiyang Zhang netvsc_packet->completion.recv.recv_completion_tid = 77595fa0405SHaiyang Zhang vmxferpage_packet->d.trans_id; 77695fa0405SHaiyang Zhang 77745326342SHaiyang Zhang netvsc_packet->data = (void *)((unsigned long)net_device-> 77845326342SHaiyang Zhang recv_buf + vmxferpage_packet->ranges[i].byte_offset); 77995fa0405SHaiyang Zhang netvsc_packet->total_data_buflen = 78095fa0405SHaiyang Zhang vmxferpage_packet->ranges[i].byte_count; 78195fa0405SHaiyang Zhang 78295fa0405SHaiyang Zhang /* Pass it to the upper layer */ 78395fa0405SHaiyang Zhang rndis_filter_receive(device, netvsc_packet); 78495fa0405SHaiyang Zhang 78595fa0405SHaiyang Zhang netvsc_receive_completion(netvsc_packet-> 78695fa0405SHaiyang Zhang completion.recv.recv_completion_ctx); 78795fa0405SHaiyang Zhang } 78895fa0405SHaiyang Zhang 78995fa0405SHaiyang Zhang } 79095fa0405SHaiyang Zhang 79195fa0405SHaiyang Zhang static void netvsc_channel_cb(void *context) 79295fa0405SHaiyang Zhang { 79395fa0405SHaiyang Zhang int ret; 79495fa0405SHaiyang Zhang struct hv_device *device = context; 79595fa0405SHaiyang Zhang struct netvsc_device *net_device; 79695fa0405SHaiyang Zhang u32 bytes_recvd; 79795fa0405SHaiyang Zhang u64 request_id; 79895fa0405SHaiyang Zhang struct vmpacket_descriptor *desc; 79995fa0405SHaiyang Zhang unsigned char *buffer; 80095fa0405SHaiyang Zhang int bufferlen = NETVSC_PACKET_SIZE; 80195fa0405SHaiyang Zhang struct net_device *ndev; 80295fa0405SHaiyang Zhang 80395fa0405SHaiyang Zhang net_device = get_inbound_net_device(device); 80495fa0405SHaiyang Zhang if (!net_device) 805ee0c4c39SKY Srinivasan return; 80695fa0405SHaiyang Zhang ndev = net_device->ndev; 807ee0c4c39SKY Srinivasan buffer = net_device->cb_buffer; 80895fa0405SHaiyang Zhang 80995fa0405SHaiyang Zhang do { 81095fa0405SHaiyang Zhang ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen, 81195fa0405SHaiyang Zhang &bytes_recvd, &request_id); 81295fa0405SHaiyang Zhang if (ret == 0) { 81395fa0405SHaiyang Zhang if (bytes_recvd > 0) { 81495fa0405SHaiyang Zhang desc = (struct vmpacket_descriptor *)buffer; 81595fa0405SHaiyang Zhang switch (desc->type) { 81695fa0405SHaiyang Zhang case VM_PKT_COMP: 81797c1723aSKY Srinivasan netvsc_send_completion(net_device, 81897c1723aSKY Srinivasan device, desc); 81995fa0405SHaiyang Zhang break; 82095fa0405SHaiyang Zhang 82195fa0405SHaiyang Zhang case VM_PKT_DATA_USING_XFER_PAGES: 82297c1723aSKY Srinivasan netvsc_receive(net_device, 82397c1723aSKY Srinivasan device, desc); 82495fa0405SHaiyang Zhang break; 82595fa0405SHaiyang Zhang 82695fa0405SHaiyang Zhang default: 82795fa0405SHaiyang Zhang netdev_err(ndev, 82895fa0405SHaiyang Zhang "unhandled packet type %d, " 82995fa0405SHaiyang Zhang "tid %llx len %d\n", 83095fa0405SHaiyang Zhang desc->type, request_id, 83195fa0405SHaiyang Zhang bytes_recvd); 83295fa0405SHaiyang Zhang break; 83395fa0405SHaiyang Zhang } 83495fa0405SHaiyang Zhang 83595fa0405SHaiyang Zhang } else { 836ee0c4c39SKY Srinivasan /* 837ee0c4c39SKY Srinivasan * We are done for this pass. 838ee0c4c39SKY Srinivasan */ 83995fa0405SHaiyang Zhang break; 84095fa0405SHaiyang Zhang } 841ee0c4c39SKY Srinivasan 84295fa0405SHaiyang Zhang } else if (ret == -ENOBUFS) { 843ee0c4c39SKY Srinivasan if (bufferlen > NETVSC_PACKET_SIZE) 844ee0c4c39SKY Srinivasan kfree(buffer); 84595fa0405SHaiyang Zhang /* Handle large packet */ 84695fa0405SHaiyang Zhang buffer = kmalloc(bytes_recvd, GFP_ATOMIC); 84795fa0405SHaiyang Zhang if (buffer == NULL) { 84895fa0405SHaiyang Zhang /* Try again next time around */ 84995fa0405SHaiyang Zhang netdev_err(ndev, 85095fa0405SHaiyang Zhang "unable to allocate buffer of size " 85195fa0405SHaiyang Zhang "(%d)!!\n", bytes_recvd); 85295fa0405SHaiyang Zhang break; 85395fa0405SHaiyang Zhang } 85495fa0405SHaiyang Zhang 85595fa0405SHaiyang Zhang bufferlen = bytes_recvd; 85695fa0405SHaiyang Zhang } 85795fa0405SHaiyang Zhang } while (1); 85895fa0405SHaiyang Zhang 859ee0c4c39SKY Srinivasan if (bufferlen > NETVSC_PACKET_SIZE) 86095fa0405SHaiyang Zhang kfree(buffer); 86195fa0405SHaiyang Zhang return; 86295fa0405SHaiyang Zhang } 86395fa0405SHaiyang Zhang 86495fa0405SHaiyang Zhang /* 86595fa0405SHaiyang Zhang * netvsc_device_add - Callback when the device belonging to this 86695fa0405SHaiyang Zhang * driver is added 86795fa0405SHaiyang Zhang */ 86895fa0405SHaiyang Zhang int netvsc_device_add(struct hv_device *device, void *additional_info) 86995fa0405SHaiyang Zhang { 87095fa0405SHaiyang Zhang int ret = 0; 87195fa0405SHaiyang Zhang int i; 87295fa0405SHaiyang Zhang int ring_size = 87395fa0405SHaiyang Zhang ((struct netvsc_device_info *)additional_info)->ring_size; 87495fa0405SHaiyang Zhang struct netvsc_device *net_device; 87595fa0405SHaiyang Zhang struct hv_netvsc_packet *packet, *pos; 87695fa0405SHaiyang Zhang struct net_device *ndev; 87795fa0405SHaiyang Zhang 87895fa0405SHaiyang Zhang net_device = alloc_net_device(device); 87995fa0405SHaiyang Zhang if (!net_device) { 88095fa0405SHaiyang Zhang ret = -ENOMEM; 88195fa0405SHaiyang Zhang goto cleanup; 88295fa0405SHaiyang Zhang } 88395fa0405SHaiyang Zhang 88495fa0405SHaiyang Zhang /* 88595fa0405SHaiyang Zhang * Coming into this function, struct net_device * is 88695fa0405SHaiyang Zhang * registered as the driver private data. 88795fa0405SHaiyang Zhang * In alloc_net_device(), we register struct netvsc_device * 88895fa0405SHaiyang Zhang * as the driver private data and stash away struct net_device * 88995fa0405SHaiyang Zhang * in struct netvsc_device *. 89095fa0405SHaiyang Zhang */ 89195fa0405SHaiyang Zhang ndev = net_device->ndev; 89295fa0405SHaiyang Zhang 89395fa0405SHaiyang Zhang /* Initialize the NetVSC channel extension */ 89495fa0405SHaiyang Zhang net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; 89595fa0405SHaiyang Zhang spin_lock_init(&net_device->recv_pkt_list_lock); 89695fa0405SHaiyang Zhang 89795fa0405SHaiyang Zhang INIT_LIST_HEAD(&net_device->recv_pkt_list); 89895fa0405SHaiyang Zhang 89995fa0405SHaiyang Zhang for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) { 9006562640bSHaiyang Zhang packet = kzalloc(sizeof(struct hv_netvsc_packet), GFP_KERNEL); 90195fa0405SHaiyang Zhang if (!packet) 90295fa0405SHaiyang Zhang break; 90395fa0405SHaiyang Zhang 90495fa0405SHaiyang Zhang list_add_tail(&packet->list_ent, 90595fa0405SHaiyang Zhang &net_device->recv_pkt_list); 90695fa0405SHaiyang Zhang } 90795fa0405SHaiyang Zhang init_completion(&net_device->channel_init_wait); 90895fa0405SHaiyang Zhang 90995fa0405SHaiyang Zhang /* Open the channel */ 91095fa0405SHaiyang Zhang ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, 91195fa0405SHaiyang Zhang ring_size * PAGE_SIZE, NULL, 0, 91295fa0405SHaiyang Zhang netvsc_channel_cb, device); 91395fa0405SHaiyang Zhang 91495fa0405SHaiyang Zhang if (ret != 0) { 91595fa0405SHaiyang Zhang netdev_err(ndev, "unable to open channel: %d\n", ret); 91695fa0405SHaiyang Zhang goto cleanup; 91795fa0405SHaiyang Zhang } 91895fa0405SHaiyang Zhang 91995fa0405SHaiyang Zhang /* Channel is opened */ 92095fa0405SHaiyang Zhang pr_info("hv_netvsc channel opened successfully\n"); 92195fa0405SHaiyang Zhang 92295fa0405SHaiyang Zhang /* Connect with the NetVsp */ 92395fa0405SHaiyang Zhang ret = netvsc_connect_vsp(device); 92495fa0405SHaiyang Zhang if (ret != 0) { 92595fa0405SHaiyang Zhang netdev_err(ndev, 92695fa0405SHaiyang Zhang "unable to connect to NetVSP - %d\n", ret); 92795fa0405SHaiyang Zhang goto close; 92895fa0405SHaiyang Zhang } 92995fa0405SHaiyang Zhang 93095fa0405SHaiyang Zhang return ret; 93195fa0405SHaiyang Zhang 93295fa0405SHaiyang Zhang close: 93395fa0405SHaiyang Zhang /* Now, we can close the channel safely */ 93495fa0405SHaiyang Zhang vmbus_close(device->channel); 93595fa0405SHaiyang Zhang 93695fa0405SHaiyang Zhang cleanup: 93795fa0405SHaiyang Zhang 93895fa0405SHaiyang Zhang if (net_device) { 93995fa0405SHaiyang Zhang list_for_each_entry_safe(packet, pos, 94095fa0405SHaiyang Zhang &net_device->recv_pkt_list, 94195fa0405SHaiyang Zhang list_ent) { 94295fa0405SHaiyang Zhang list_del(&packet->list_ent); 94395fa0405SHaiyang Zhang kfree(packet); 94495fa0405SHaiyang Zhang } 94595fa0405SHaiyang Zhang 94695fa0405SHaiyang Zhang kfree(net_device); 94795fa0405SHaiyang Zhang } 94895fa0405SHaiyang Zhang 94995fa0405SHaiyang Zhang return ret; 95095fa0405SHaiyang Zhang } 951