| /* |
| * Copyright (c) 2009, Microsoft Corporation. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| * Place - Suite 330, Boston, MA 02111-1307 USA. |
| * |
| * Authors: |
| * Haiyang Zhang <haiyangz@microsoft.com> |
| * Hank Janssen <hjanssen@microsoft.com> |
| */ |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/wait.h> |
| #include <linux/mm.h> |
| #include <linux/delay.h> |
| #include <linux/io.h> |
| #include <linux/slab.h> |
| |
| #include "hyperv.h" |
| #include "hyperv_net.h" |
| |
| |
| static struct netvsc_device *alloc_net_device(struct hv_device *device) |
| { |
| struct netvsc_device *net_device; |
| |
| net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); |
| if (!net_device) |
| return NULL; |
| |
| /* Set to 2 to allow both inbound and outbound traffic */ |
| atomic_set(&net_device->refcnt, 2); |
| |
| net_device->destroy = false; |
| net_device->dev = device; |
| device->ext = net_device; |
| |
| return net_device; |
| } |
| |
| /* Get the net device object iff exists and its refcount > 1 */ |
| static struct netvsc_device *get_outbound_net_device(struct hv_device *device) |
| { |
| struct netvsc_device *net_device; |
| |
| net_device = device->ext; |
| if (net_device && (atomic_read(&net_device->refcnt) > 1) && |
| !net_device->destroy) |
| atomic_inc(&net_device->refcnt); |
| else |
| net_device = NULL; |
| |
| return net_device; |
| } |
| |
| /* Get the net device object iff exists and its refcount > 0 */ |
| static struct netvsc_device *get_inbound_net_device(struct hv_device *device) |
| { |
| struct netvsc_device *net_device; |
| |
| net_device = device->ext; |
| if (net_device && atomic_read(&net_device->refcnt)) |
| atomic_inc(&net_device->refcnt); |
| else |
| net_device = NULL; |
| |
| return net_device; |
| } |
| |
| static void put_net_device(struct hv_device *device) |
| { |
| struct netvsc_device *net_device; |
| |
| net_device = device->ext; |
| |
| atomic_dec(&net_device->refcnt); |
| } |
| |
| static struct netvsc_device *release_outbound_net_device( |
| struct hv_device *device) |
| { |
| struct netvsc_device *net_device; |
| |
| net_device = device->ext; |
| if (net_device == NULL) |
| return NULL; |
| |
| /* Busy wait until the ref drop to 2, then set it to 1 */ |
| while (atomic_cmpxchg(&net_device->refcnt, 2, 1) != 2) |
| udelay(100); |
| |
| return net_device; |
| } |
| |
| static struct netvsc_device *release_inbound_net_device( |
| struct hv_device *device) |
| { |
| struct netvsc_device *net_device; |
| |
| net_device = device->ext; |
| if (net_device == NULL) |
| return NULL; |
| |
| /* Busy wait until the ref drop to 1, then set it to 0 */ |
| while (atomic_cmpxchg(&net_device->refcnt, 1, 0) != 1) |
| udelay(100); |
| |
| device->ext = NULL; |
| return net_device; |
| } |
| |
| static int netvsc_destroy_recv_buf(struct netvsc_device *net_device) |
| { |
| struct nvsp_message *revoke_packet; |
| int ret = 0; |
| |
| /* |
| * If we got a section count, it means we received a |
| * SendReceiveBufferComplete msg (ie sent |
| * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need |
| * to send a revoke msg here |
| */ |
| if (net_device->recv_section_cnt) { |
| /* Send the revoke receive buffer */ |
| revoke_packet = &net_device->revoke_packet; |
| memset(revoke_packet, 0, sizeof(struct nvsp_message)); |
| |
| revoke_packet->hdr.msg_type = |
| NVSP_MSG1_TYPE_REVOKE_RECV_BUF; |
| revoke_packet->msg.v1_msg. |
| revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; |
| |
| ret = vmbus_sendpacket(net_device->dev->channel, |
| revoke_packet, |
| sizeof(struct nvsp_message), |
| (unsigned long)revoke_packet, |
| VM_PKT_DATA_INBAND, 0); |
| /* |
| * If we failed here, we might as well return and |
| * have a leak rather than continue and a bugchk |
| */ |
| if (ret != 0) { |
| dev_err(&net_device->dev->device, "unable to send " |
| "revoke receive buffer to netvsp"); |
| return ret; |
| } |
| } |
| |
| /* Teardown the gpadl on the vsp end */ |
| if (net_device->recv_buf_gpadl_handle) { |
| ret = vmbus_teardown_gpadl(net_device->dev->channel, |
| net_device->recv_buf_gpadl_handle); |
| |
| /* If we failed here, we might as well return and have a leak |
| * rather than continue and a bugchk |
| */ |
| if (ret != 0) { |
| dev_err(&net_device->dev->device, |
| "unable to teardown receive buffer's gpadl"); |
| return -ret; |
| } |
| net_device->recv_buf_gpadl_handle = 0; |
| } |
| |
| if (net_device->recv_buf) { |
| /* Free up the receive buffer */ |
| free_pages((unsigned long)net_device->recv_buf, |
| get_order(net_device->recv_buf_size)); |
| net_device->recv_buf = NULL; |
| } |
| |
| if (net_device->recv_section) { |
| net_device->recv_section_cnt = 0; |
| kfree(net_device->recv_section); |
| net_device->recv_section = NULL; |
| } |
| |
| return ret; |
| } |
| |
| static int netvsc_init_recv_buf(struct hv_device *device) |
| { |
| int ret = 0; |
| int t; |
| struct netvsc_device *net_device; |
| struct nvsp_message *init_packet; |
| |
| net_device = get_outbound_net_device(device); |
| if (!net_device) { |
| dev_err(&device->device, "unable to get net device..." |
| "device being destroyed?"); |
| return -ENODEV; |
| } |
| |
| net_device->recv_buf = |
| (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
| get_order(net_device->recv_buf_size)); |
| if (!net_device->recv_buf) { |
| dev_err(&device->device, "unable to allocate receive " |
| "buffer of size %d", net_device->recv_buf_size); |
| ret = -ENOMEM; |
| goto cleanup; |
| } |
| |
| /* |
| * Establish the gpadl handle for this buffer on this |
| * channel. Note: This call uses the vmbus connection rather |
| * than the channel to establish the gpadl handle. |
| */ |
| ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, |
| net_device->recv_buf_size, |
| &net_device->recv_buf_gpadl_handle); |
| if (ret != 0) { |
| dev_err(&device->device, |
| "unable to establish receive buffer's gpadl"); |
| goto cleanup; |
| } |
| |
| |
| /* Notify the NetVsp of the gpadl handle */ |
| init_packet = &net_device->channel_init_pkt; |
| |
| memset(init_packet, 0, sizeof(struct nvsp_message)); |
| |
| init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; |
| init_packet->msg.v1_msg.send_recv_buf. |
| gpadl_handle = net_device->recv_buf_gpadl_handle; |
| init_packet->msg.v1_msg. |
| send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; |
| |
| /* Send the gpadl notification request */ |
| ret = vmbus_sendpacket(device->channel, init_packet, |
| sizeof(struct nvsp_message), |
| (unsigned long)init_packet, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| if (ret != 0) { |
| dev_err(&device->device, |
| "unable to send receive buffer's gpadl to netvsp"); |
| goto cleanup; |
| } |
| |
| t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); |
| BUG_ON(t == 0); |
| |
| |
| /* Check the response */ |
| if (init_packet->msg.v1_msg. |
| send_recv_buf_complete.status != NVSP_STAT_SUCCESS) { |
| dev_err(&device->device, "Unable to complete receive buffer " |
| "initialzation with NetVsp - status %d", |
| init_packet->msg.v1_msg. |
| send_recv_buf_complete.status); |
| ret = -EINVAL; |
| goto cleanup; |
| } |
| |
| /* Parse the response */ |
| |
| net_device->recv_section_cnt = init_packet->msg. |
| v1_msg.send_recv_buf_complete.num_sections; |
| |
| net_device->recv_section = kmalloc(net_device->recv_section_cnt |
| * sizeof(struct nvsp_1_receive_buffer_section), GFP_KERNEL); |
| if (net_device->recv_section == NULL) { |
| ret = -EINVAL; |
| goto cleanup; |
| } |
| |
| memcpy(net_device->recv_section, |
| init_packet->msg.v1_msg. |
| send_recv_buf_complete.sections, |
| net_device->recv_section_cnt * |
| sizeof(struct nvsp_1_receive_buffer_section)); |
| |
| /* |
| * For 1st release, there should only be 1 section that represents the |
| * entire receive buffer |
| */ |
| if (net_device->recv_section_cnt != 1 || |
| net_device->recv_section->offset != 0) { |
| ret = -EINVAL; |
| goto cleanup; |
| } |
| |
| goto exit; |
| |
| cleanup: |
| netvsc_destroy_recv_buf(net_device); |
| |
| exit: |
| put_net_device(device); |
| return ret; |
| } |
| |
| |
| static int netvsc_connect_vsp(struct hv_device *device) |
| { |
| int ret, t; |
| struct netvsc_device *net_device; |
| struct nvsp_message *init_packet; |
| int ndis_version; |
| |
| net_device = get_outbound_net_device(device); |
| if (!net_device) { |
| dev_err(&device->device, "unable to get net device..." |
| "device being destroyed?"); |
| return -ENODEV; |
| } |
| |
| init_packet = &net_device->channel_init_pkt; |
| |
| memset(init_packet, 0, sizeof(struct nvsp_message)); |
| init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; |
| init_packet->msg.init_msg.init.min_protocol_ver = |
| NVSP_MIN_PROTOCOL_VERSION; |
| init_packet->msg.init_msg.init.max_protocol_ver = |
| NVSP_MAX_PROTOCOL_VERSION; |
| |
| /* Send the init request */ |
| ret = vmbus_sendpacket(device->channel, init_packet, |
| sizeof(struct nvsp_message), |
| (unsigned long)init_packet, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| |
| if (ret != 0) |
| goto cleanup; |
| |
| t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); |
| |
| if (t == 0) { |
| ret = -ETIMEDOUT; |
| goto cleanup; |
| } |
| |
| if (init_packet->msg.init_msg.init_complete.status != |
| NVSP_STAT_SUCCESS) { |
| ret = -EINVAL; |
| goto cleanup; |
| } |
| |
| if (init_packet->msg.init_msg.init_complete. |
| negotiated_protocol_ver != NVSP_PROTOCOL_VERSION_1) { |
| ret = -EPROTO; |
| goto cleanup; |
| } |
| /* Send the ndis version */ |
| memset(init_packet, 0, sizeof(struct nvsp_message)); |
| |
| ndis_version = 0x00050000; |
| |
| init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; |
| init_packet->msg.v1_msg. |
| send_ndis_ver.ndis_major_ver = |
| (ndis_version & 0xFFFF0000) >> 16; |
| init_packet->msg.v1_msg. |
| send_ndis_ver.ndis_minor_ver = |
| ndis_version & 0xFFFF; |
| |
| /* Send the init request */ |
| ret = vmbus_sendpacket(device->channel, init_packet, |
| sizeof(struct nvsp_message), |
| (unsigned long)init_packet, |
| VM_PKT_DATA_INBAND, 0); |
| if (ret != 0) |
| goto cleanup; |
| |
| /* Post the big receive buffer to NetVSP */ |
| ret = netvsc_init_recv_buf(device); |
| |
| cleanup: |
| put_net_device(device); |
| return ret; |
| } |
| |
| static void netvsc_disconnect_vsp(struct netvsc_device *net_device) |
| { |
| netvsc_destroy_recv_buf(net_device); |
| } |
| |
| /* |
| * netvsc_device_remove - Callback when the root bus device is removed |
| */ |
| int netvsc_device_remove(struct hv_device *device) |
| { |
| struct netvsc_device *net_device; |
| struct hv_netvsc_packet *netvsc_packet, *pos; |
| unsigned long flags; |
| |
| /* Stop outbound traffic ie sends and receives completions */ |
| net_device = release_outbound_net_device(device); |
| if (!net_device) { |
| dev_err(&device->device, "No net device present!!"); |
| return -ENODEV; |
| } |
| |
| spin_lock_irqsave(&device->channel->inbound_lock, flags); |
| net_device->destroy = true; |
| spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
| |
| /* Wait for all send completions */ |
| while (atomic_read(&net_device->num_outstanding_sends)) { |
| dev_err(&device->device, |
| "waiting for %d requests to complete...", |
| atomic_read(&net_device->num_outstanding_sends)); |
| udelay(100); |
| } |
| |
| netvsc_disconnect_vsp(net_device); |
| |
| /* Stop inbound traffic ie receives and sends completions */ |
| net_device = release_inbound_net_device(device); |
| |
| /* At this point, no one should be accessing netDevice except in here */ |
| dev_notice(&device->device, "net device safe to remove"); |
| |
| /* Now, we can close the channel safely */ |
| vmbus_close(device->channel); |
| |
| /* Release all resources */ |
| list_for_each_entry_safe(netvsc_packet, pos, |
| &net_device->recv_pkt_list, list_ent) { |
| list_del(&netvsc_packet->list_ent); |
| kfree(netvsc_packet); |
| } |
| |
| kfree(net_device); |
| return 0; |
| } |
| |
| static void netvsc_send_completion(struct hv_device *device, |
| struct vmpacket_descriptor *packet) |
| { |
| struct netvsc_device *net_device; |
| struct nvsp_message *nvsp_packet; |
| struct hv_netvsc_packet *nvsc_packet; |
| |
| net_device = get_inbound_net_device(device); |
| if (!net_device) { |
| dev_err(&device->device, "unable to get net device..." |
| "device being destroyed?"); |
| return; |
| } |
| |
| nvsp_packet = (struct nvsp_message *)((unsigned long)packet + |
| (packet->offset8 << 3)); |
| |
| if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) || |
| (nvsp_packet->hdr.msg_type == |
| NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) || |
| (nvsp_packet->hdr.msg_type == |
| NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) { |
| /* Copy the response back */ |
| memcpy(&net_device->channel_init_pkt, nvsp_packet, |
| sizeof(struct nvsp_message)); |
| complete(&net_device->channel_init_wait); |
| } else if (nvsp_packet->hdr.msg_type == |
| NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) { |
| /* Get the send context */ |
| nvsc_packet = (struct hv_netvsc_packet *)(unsigned long) |
| packet->trans_id; |
| |
| /* Notify the layer above us */ |
| nvsc_packet->completion.send.send_completion( |
| nvsc_packet->completion.send.send_completion_ctx); |
| |
| atomic_dec(&net_device->num_outstanding_sends); |
| } else { |
| dev_err(&device->device, "Unknown send completion packet type- " |
| "%d received!!", nvsp_packet->hdr.msg_type); |
| } |
| |
| put_net_device(device); |
| } |
| |
| int netvsc_send(struct hv_device *device, |
| struct hv_netvsc_packet *packet) |
| { |
| struct netvsc_device *net_device; |
| int ret = 0; |
| |
| struct nvsp_message sendMessage; |
| |
| net_device = get_outbound_net_device(device); |
| if (!net_device) { |
| dev_err(&device->device, "net device (%p) shutting down..." |
| "ignoring outbound packets", net_device); |
| return -ENODEV; |
| } |
| |
| sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; |
| if (packet->is_data_pkt) { |
| /* 0 is RMC_DATA; */ |
| sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0; |
| } else { |
| /* 1 is RMC_CONTROL; */ |
| sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1; |
| } |
| |
| /* Not using send buffer section */ |
| sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index = |
| 0xFFFFFFFF; |
| sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; |
| |
| if (packet->page_buf_cnt) { |
| ret = vmbus_sendpacket_pagebuffer(device->channel, |
| packet->page_buf, |
| packet->page_buf_cnt, |
| &sendMessage, |
| sizeof(struct nvsp_message), |
| (unsigned long)packet); |
| } else { |
| ret = vmbus_sendpacket(device->channel, &sendMessage, |
| sizeof(struct nvsp_message), |
| (unsigned long)packet, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| |
| } |
| |
| if (ret != 0) |
| dev_err(&device->device, "Unable to send packet %p ret %d", |
| packet, ret); |
| |
| atomic_inc(&net_device->num_outstanding_sends); |
| put_net_device(device); |
| return ret; |
| } |
| |
| static void netvsc_send_recv_completion(struct hv_device *device, |
| u64 transaction_id) |
| { |
| struct nvsp_message recvcompMessage; |
| int retries = 0; |
| int ret; |
| |
| recvcompMessage.hdr.msg_type = |
| NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; |
| |
| /* FIXME: Pass in the status */ |
| recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = |
| NVSP_STAT_SUCCESS; |
| |
| retry_send_cmplt: |
| /* Send the completion */ |
| ret = vmbus_sendpacket(device->channel, &recvcompMessage, |
| sizeof(struct nvsp_message), transaction_id, |
| VM_PKT_COMP, 0); |
| if (ret == 0) { |
| /* success */ |
| /* no-op */ |
| } else if (ret == -EAGAIN) { |
| /* no more room...wait a bit and attempt to retry 3 times */ |
| retries++; |
| dev_err(&device->device, "unable to send receive completion pkt" |
| " (tid %llx)...retrying %d", transaction_id, retries); |
| |
| if (retries < 4) { |
| udelay(100); |
| goto retry_send_cmplt; |
| } else { |
| dev_err(&device->device, "unable to send receive " |
| "completion pkt (tid %llx)...give up retrying", |
| transaction_id); |
| } |
| } else { |
| dev_err(&device->device, "unable to send receive " |
| "completion pkt - %llx", transaction_id); |
| } |
| } |
| |
| /* Send a receive completion packet to RNDIS device (ie NetVsp) */ |
| static void netvsc_receive_completion(void *context) |
| { |
| struct hv_netvsc_packet *packet = context; |
| struct hv_device *device = (struct hv_device *)packet->device; |
| struct netvsc_device *net_device; |
| u64 transaction_id = 0; |
| bool fsend_receive_comp = false; |
| unsigned long flags; |
| |
| /* |
| * Even though it seems logical to do a GetOutboundNetDevice() here to |
| * send out receive completion, we are using GetInboundNetDevice() |
| * since we may have disable outbound traffic already. |
| */ |
| net_device = get_inbound_net_device(device); |
| if (!net_device) { |
| dev_err(&device->device, "unable to get net device..." |
| "device being destroyed?"); |
| return; |
| } |
| |
| /* Overloading use of the lock. */ |
| spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); |
| |
| packet->xfer_page_pkt->count--; |
| |
| /* |
| * Last one in the line that represent 1 xfer page packet. |
| * Return the xfer page packet itself to the freelist |
| */ |
| if (packet->xfer_page_pkt->count == 0) { |
| fsend_receive_comp = true; |
| transaction_id = packet->completion.recv.recv_completion_tid; |
| list_add_tail(&packet->xfer_page_pkt->list_ent, |
| &net_device->recv_pkt_list); |
| |
| } |
| |
| /* Put the packet back */ |
| list_add_tail(&packet->list_ent, &net_device->recv_pkt_list); |
| spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); |
| |
| /* Send a receive completion for the xfer page packet */ |
| if (fsend_receive_comp) |
| netvsc_send_recv_completion(device, transaction_id); |
| |
| put_net_device(device); |
| } |
| |
| static void netvsc_receive(struct hv_device *device, |
| struct vmpacket_descriptor *packet) |
| { |
| struct netvsc_device *net_device; |
| struct vmtransfer_page_packet_header *vmxferpage_packet; |
| struct nvsp_message *nvsp_packet; |
| struct hv_netvsc_packet *netvsc_packet = NULL; |
| unsigned long start; |
| unsigned long end, end_virtual; |
| /* struct netvsc_driver *netvscDriver; */ |
| struct xferpage_packet *xferpage_packet = NULL; |
| int i, j; |
| int count = 0, bytes_remain = 0; |
| unsigned long flags; |
| |
| LIST_HEAD(listHead); |
| |
| net_device = get_inbound_net_device(device); |
| if (!net_device) { |
| dev_err(&device->device, "unable to get net device..." |
| "device being destroyed?"); |
| return; |
| } |
| |
| /* |
| * All inbound packets other than send completion should be xfer page |
| * packet |
| */ |
| if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { |
| dev_err(&device->device, "Unknown packet type received - %d", |
| packet->type); |
| put_net_device(device); |
| return; |
| } |
| |
| nvsp_packet = (struct nvsp_message *)((unsigned long)packet + |
| (packet->offset8 << 3)); |
| |
| /* Make sure this is a valid nvsp packet */ |
| if (nvsp_packet->hdr.msg_type != |
| NVSP_MSG1_TYPE_SEND_RNDIS_PKT) { |
| dev_err(&device->device, "Unknown nvsp packet type received-" |
| " %d", nvsp_packet->hdr.msg_type); |
| put_net_device(device); |
| return; |
| } |
| |
| vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; |
| |
| if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { |
| dev_err(&device->device, "Invalid xfer page set id - " |
| "expecting %x got %x", NETVSC_RECEIVE_BUFFER_ID, |
| vmxferpage_packet->xfer_pageset_id); |
| put_net_device(device); |
| return; |
| } |
| |
| /* |
| * Grab free packets (range count + 1) to represent this xfer |
| * page packet. +1 to represent the xfer page packet itself. |
| * We grab it here so that we know exactly how many we can |
| * fulfil |
| */ |
| spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); |
| while (!list_empty(&net_device->recv_pkt_list)) { |
| list_move_tail(net_device->recv_pkt_list.next, &listHead); |
| if (++count == vmxferpage_packet->range_cnt + 1) |
| break; |
| } |
| spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); |
| |
| /* |
| * We need at least 2 netvsc pkts (1 to represent the xfer |
| * page and at least 1 for the range) i.e. we can handled |
| * some of the xfer page packet ranges... |
| */ |
| if (count < 2) { |
| dev_err(&device->device, "Got only %d netvsc pkt...needed " |
| "%d pkts. Dropping this xfer page packet completely!", |
| count, vmxferpage_packet->range_cnt + 1); |
| |
| /* Return it to the freelist */ |
| spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); |
| for (i = count; i != 0; i--) { |
| list_move_tail(listHead.next, |
| &net_device->recv_pkt_list); |
| } |
| spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, |
| flags); |
| |
| netvsc_send_recv_completion(device, |
| vmxferpage_packet->d.trans_id); |
| |
| put_net_device(device); |
| return; |
| } |
| |
| /* Remove the 1st packet to represent the xfer page packet itself */ |
| xferpage_packet = (struct xferpage_packet *)listHead.next; |
| list_del(&xferpage_packet->list_ent); |
| |
| /* This is how much we can satisfy */ |
| xferpage_packet->count = count - 1; |
| |
| if (xferpage_packet->count != vmxferpage_packet->range_cnt) { |
| dev_err(&device->device, "Needed %d netvsc pkts to satisy " |
| "this xfer page...got %d", |
| vmxferpage_packet->range_cnt, xferpage_packet->count); |
| } |
| |
| /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ |
| for (i = 0; i < (count - 1); i++) { |
| netvsc_packet = (struct hv_netvsc_packet *)listHead.next; |
| list_del(&netvsc_packet->list_ent); |
| |
| /* Initialize the netvsc packet */ |
| netvsc_packet->xfer_page_pkt = xferpage_packet; |
| netvsc_packet->completion.recv.recv_completion = |
| netvsc_receive_completion; |
| netvsc_packet->completion.recv.recv_completion_ctx = |
| netvsc_packet; |
| netvsc_packet->device = device; |
| /* Save this so that we can send it back */ |
| netvsc_packet->completion.recv.recv_completion_tid = |
| vmxferpage_packet->d.trans_id; |
| |
| netvsc_packet->total_data_buflen = |
| vmxferpage_packet->ranges[i].byte_count; |
| netvsc_packet->page_buf_cnt = 1; |
| |
| netvsc_packet->page_buf[0].len = |
| vmxferpage_packet->ranges[i].byte_count; |
| |
| start = virt_to_phys((void *)((unsigned long)net_device-> |
| recv_buf + vmxferpage_packet->ranges[i].byte_offset)); |
| |
| netvsc_packet->page_buf[0].pfn = start >> PAGE_SHIFT; |
| end_virtual = (unsigned long)net_device->recv_buf |
| + vmxferpage_packet->ranges[i].byte_offset |
| + vmxferpage_packet->ranges[i].byte_count - 1; |
| end = virt_to_phys((void *)end_virtual); |
| |
| /* Calculate the page relative offset */ |
| netvsc_packet->page_buf[0].offset = |
| vmxferpage_packet->ranges[i].byte_offset & |
| (PAGE_SIZE - 1); |
| if ((end >> PAGE_SHIFT) != (start >> PAGE_SHIFT)) { |
| /* Handle frame across multiple pages: */ |
| netvsc_packet->page_buf[0].len = |
| (netvsc_packet->page_buf[0].pfn << |
| PAGE_SHIFT) |
| + PAGE_SIZE - start; |
| bytes_remain = netvsc_packet->total_data_buflen - |
| netvsc_packet->page_buf[0].len; |
| for (j = 1; j < NETVSC_PACKET_MAXPAGE; j++) { |
| netvsc_packet->page_buf[j].offset = 0; |
| if (bytes_remain <= PAGE_SIZE) { |
| netvsc_packet->page_buf[j].len = |
| bytes_remain; |
| bytes_remain = 0; |
| } else { |
| netvsc_packet->page_buf[j].len = |
| PAGE_SIZE; |
| bytes_remain -= PAGE_SIZE; |
| } |
| netvsc_packet->page_buf[j].pfn = |
| virt_to_phys((void *)(end_virtual - |
| bytes_remain)) >> PAGE_SHIFT; |
| netvsc_packet->page_buf_cnt++; |
| if (bytes_remain == 0) |
| break; |
| } |
| } |
| |
| /* Pass it to the upper layer */ |
| rndis_filter_receive(device, netvsc_packet); |
| |
| netvsc_receive_completion(netvsc_packet-> |
| completion.recv.recv_completion_ctx); |
| } |
| |
| put_net_device(device); |
| } |
| |
| static void netvsc_channel_cb(void *context) |
| { |
| int ret; |
| struct hv_device *device = context; |
| struct netvsc_device *net_device; |
| u32 bytes_recvd; |
| u64 request_id; |
| unsigned char *packet; |
| struct vmpacket_descriptor *desc; |
| unsigned char *buffer; |
| int bufferlen = NETVSC_PACKET_SIZE; |
| |
| packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char), |
| GFP_ATOMIC); |
| if (!packet) |
| return; |
| buffer = packet; |
| |
| net_device = get_inbound_net_device(device); |
| if (!net_device) { |
| dev_err(&device->device, "net device (%p) shutting down..." |
| "ignoring inbound packets", net_device); |
| goto out; |
| } |
| |
| do { |
| ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen, |
| &bytes_recvd, &request_id); |
| if (ret == 0) { |
| if (bytes_recvd > 0) { |
| desc = (struct vmpacket_descriptor *)buffer; |
| switch (desc->type) { |
| case VM_PKT_COMP: |
| netvsc_send_completion(device, desc); |
| break; |
| |
| case VM_PKT_DATA_USING_XFER_PAGES: |
| netvsc_receive(device, desc); |
| break; |
| |
| default: |
| dev_err(&device->device, |
| "unhandled packet type %d, " |
| "tid %llx len %d\n", |
| desc->type, request_id, |
| bytes_recvd); |
| break; |
| } |
| |
| /* reset */ |
| if (bufferlen > NETVSC_PACKET_SIZE) { |
| kfree(buffer); |
| buffer = packet; |
| bufferlen = NETVSC_PACKET_SIZE; |
| } |
| } else { |
| /* reset */ |
| if (bufferlen > NETVSC_PACKET_SIZE) { |
| kfree(buffer); |
| buffer = packet; |
| bufferlen = NETVSC_PACKET_SIZE; |
| } |
| |
| break; |
| } |
| } else if (ret == -ENOBUFS) { |
| /* Handle large packet */ |
| buffer = kmalloc(bytes_recvd, GFP_ATOMIC); |
| if (buffer == NULL) { |
| /* Try again next time around */ |
| dev_err(&device->device, |
| "unable to allocate buffer of size " |
| "(%d)!!", bytes_recvd); |
| break; |
| } |
| |
| bufferlen = bytes_recvd; |
| } |
| } while (1); |
| |
| put_net_device(device); |
| out: |
| kfree(buffer); |
| return; |
| } |
| |
| /* |
| * netvsc_device_add - Callback when the device belonging to this |
| * driver is added |
| */ |
| int netvsc_device_add(struct hv_device *device, void *additional_info) |
| { |
| int ret = 0; |
| int i; |
| int ring_size = |
| ((struct netvsc_device_info *)additional_info)->ring_size; |
| struct netvsc_device *net_device; |
| struct hv_netvsc_packet *packet, *pos; |
| |
| net_device = alloc_net_device(device); |
| if (!net_device) { |
| ret = -ENOMEM; |
| goto cleanup; |
| } |
| |
| /* Initialize the NetVSC channel extension */ |
| net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; |
| spin_lock_init(&net_device->recv_pkt_list_lock); |
| |
| INIT_LIST_HEAD(&net_device->recv_pkt_list); |
| |
| for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) { |
| packet = kzalloc(sizeof(struct hv_netvsc_packet) + |
| (NETVSC_RECEIVE_SG_COUNT * |
| sizeof(struct hv_page_buffer)), GFP_KERNEL); |
| if (!packet) |
| break; |
| |
| list_add_tail(&packet->list_ent, |
| &net_device->recv_pkt_list); |
| } |
| init_completion(&net_device->channel_init_wait); |
| |
| /* Open the channel */ |
| ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, |
| ring_size * PAGE_SIZE, NULL, 0, |
| netvsc_channel_cb, device); |
| |
| if (ret != 0) { |
| dev_err(&device->device, "unable to open channel: %d", ret); |
| goto cleanup; |
| } |
| |
| /* Channel is opened */ |
| pr_info("hv_netvsc channel opened successfully"); |
| |
| /* Connect with the NetVsp */ |
| ret = netvsc_connect_vsp(device); |
| if (ret != 0) { |
| dev_err(&device->device, |
| "unable to connect to NetVSP - %d", ret); |
| goto close; |
| } |
| |
| return ret; |
| |
| close: |
| /* Now, we can close the channel safely */ |
| vmbus_close(device->channel); |
| |
| cleanup: |
| |
| if (net_device) { |
| list_for_each_entry_safe(packet, pos, |
| &net_device->recv_pkt_list, |
| list_ent) { |
| list_del(&packet->list_ent); |
| kfree(packet); |
| } |
| |
| release_outbound_net_device(device); |
| release_inbound_net_device(device); |
| |
| kfree(net_device); |
| } |
| |
| return ret; |
| } |