| /* |
| * 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, see <http://www.gnu.org/licenses/>. |
| * |
| * 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 <linux/netdevice.h> |
| #include <linux/if_ether.h> |
| #include <asm/sync_bitops.h> |
| |
| #include "hyperv_net.h" |
| |
| |
| static struct netvsc_device *alloc_net_device(struct hv_device *device) |
| { |
| struct netvsc_device *net_device; |
| struct net_device *ndev = hv_get_drvdata(device); |
| |
| net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); |
| if (!net_device) |
| return NULL; |
| |
| init_waitqueue_head(&net_device->wait_drain); |
| net_device->start_remove = false; |
| net_device->destroy = false; |
| net_device->dev = device; |
| net_device->ndev = ndev; |
| |
| hv_set_drvdata(device, net_device); |
| return net_device; |
| } |
| |
| static struct netvsc_device *get_outbound_net_device(struct hv_device *device) |
| { |
| struct netvsc_device *net_device; |
| |
| net_device = hv_get_drvdata(device); |
| if (net_device && net_device->destroy) |
| net_device = NULL; |
| |
| return net_device; |
| } |
| |
| static struct netvsc_device *get_inbound_net_device(struct hv_device *device) |
| { |
| struct netvsc_device *net_device; |
| |
| net_device = hv_get_drvdata(device); |
| |
| if (!net_device) |
| goto get_in_err; |
| |
| if (net_device->destroy && |
| atomic_read(&net_device->num_outstanding_sends) == 0) |
| net_device = NULL; |
| |
| get_in_err: |
| return net_device; |
| } |
| |
| |
| static int netvsc_destroy_buf(struct netvsc_device *net_device) |
| { |
| struct nvsp_message *revoke_packet; |
| int ret = 0; |
| struct net_device *ndev = net_device->ndev; |
| |
| /* |
| * 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) { |
| netdev_err(ndev, "unable to send " |
| "revoke receive buffer to netvsp\n"); |
| 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) { |
| netdev_err(ndev, |
| "unable to teardown receive buffer's gpadl\n"); |
| return ret; |
| } |
| net_device->recv_buf_gpadl_handle = 0; |
| } |
| |
| if (net_device->recv_buf) { |
| /* Free up the receive buffer */ |
| vfree(net_device->recv_buf); |
| 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; |
| } |
| |
| /* Deal with the send buffer we may have setup. |
| * If we got a send section size, it means we received a |
| * SendsendBufferComplete msg (ie sent |
| * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need |
| * to send a revoke msg here |
| */ |
| if (net_device->send_section_size) { |
| /* 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_SEND_BUF; |
| revoke_packet->msg.v1_msg.revoke_recv_buf.id = 0; |
| |
| 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) { |
| netdev_err(ndev, "unable to send " |
| "revoke send buffer to netvsp\n"); |
| return ret; |
| } |
| } |
| /* Teardown the gpadl on the vsp end */ |
| if (net_device->send_buf_gpadl_handle) { |
| ret = vmbus_teardown_gpadl(net_device->dev->channel, |
| net_device->send_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) { |
| netdev_err(ndev, |
| "unable to teardown send buffer's gpadl\n"); |
| return ret; |
| } |
| net_device->send_buf_gpadl_handle = 0; |
| } |
| if (net_device->send_buf) { |
| /* Free up the receive buffer */ |
| free_pages((unsigned long)net_device->send_buf, |
| get_order(net_device->send_buf_size)); |
| net_device->send_buf = NULL; |
| } |
| kfree(net_device->send_section_map); |
| |
| return ret; |
| } |
| |
| static int netvsc_init_buf(struct hv_device *device) |
| { |
| int ret = 0; |
| int t; |
| struct netvsc_device *net_device; |
| struct nvsp_message *init_packet; |
| struct net_device *ndev; |
| |
| net_device = get_outbound_net_device(device); |
| if (!net_device) |
| return -ENODEV; |
| ndev = net_device->ndev; |
| |
| net_device->recv_buf = vzalloc(net_device->recv_buf_size); |
| if (!net_device->recv_buf) { |
| netdev_err(ndev, "unable to allocate receive " |
| "buffer of size %d\n", 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) { |
| netdev_err(ndev, |
| "unable to establish receive buffer's gpadl\n"); |
| 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) { |
| netdev_err(ndev, |
| "unable to send receive buffer's gpadl to netvsp\n"); |
| 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) { |
| netdev_err(ndev, "Unable to complete receive buffer " |
| "initialization with NetVsp - status %d\n", |
| 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 = kmemdup( |
| init_packet->msg.v1_msg.send_recv_buf_complete.sections, |
| net_device->recv_section_cnt * |
| sizeof(struct nvsp_1_receive_buffer_section), |
| GFP_KERNEL); |
| if (net_device->recv_section == NULL) { |
| ret = -EINVAL; |
| goto cleanup; |
| } |
| |
| /* |
| * 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; |
| } |
| |
| /* Now setup the send buffer. |
| */ |
| net_device->send_buf = |
| (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
| get_order(net_device->send_buf_size)); |
| if (!net_device->send_buf) { |
| netdev_err(ndev, "unable to allocate send " |
| "buffer of size %d\n", net_device->send_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->send_buf, |
| net_device->send_buf_size, |
| &net_device->send_buf_gpadl_handle); |
| if (ret != 0) { |
| netdev_err(ndev, |
| "unable to establish send buffer's gpadl\n"); |
| 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_SEND_BUF; |
| init_packet->msg.v1_msg.send_recv_buf.gpadl_handle = |
| net_device->send_buf_gpadl_handle; |
| init_packet->msg.v1_msg.send_recv_buf.id = 0; |
| |
| /* 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) { |
| netdev_err(ndev, |
| "unable to send send buffer's gpadl to netvsp\n"); |
| 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_send_buf_complete.status != NVSP_STAT_SUCCESS) { |
| netdev_err(ndev, "Unable to complete send buffer " |
| "initialization with NetVsp - status %d\n", |
| init_packet->msg.v1_msg. |
| send_recv_buf_complete.status); |
| ret = -EINVAL; |
| goto cleanup; |
| } |
| |
| /* Parse the response */ |
| net_device->send_section_size = init_packet->msg. |
| v1_msg.send_send_buf_complete.section_size; |
| |
| /* Section count is simply the size divided by the section size. |
| */ |
| net_device->send_section_cnt = |
| net_device->send_buf_size/net_device->send_section_size; |
| |
| dev_info(&device->device, "Send section size: %d, Section count:%d\n", |
| net_device->send_section_size, net_device->send_section_cnt); |
| |
| /* Setup state for managing the send buffer. */ |
| net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt, |
| BITS_PER_LONG); |
| |
| net_device->send_section_map = |
| kzalloc(net_device->map_words * sizeof(ulong), GFP_KERNEL); |
| if (net_device->send_section_map == NULL) { |
| ret = -ENOMEM; |
| goto cleanup; |
| } |
| |
| goto exit; |
| |
| cleanup: |
| netvsc_destroy_buf(net_device); |
| |
| exit: |
| return ret; |
| } |
| |
| |
| /* Negotiate NVSP protocol version */ |
| static int negotiate_nvsp_ver(struct hv_device *device, |
| struct netvsc_device *net_device, |
| struct nvsp_message *init_packet, |
| u32 nvsp_ver) |
| { |
| int ret, t; |
| |
| 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_ver; |
| init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; |
| |
| /* 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) |
| return ret; |
| |
| t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); |
| |
| if (t == 0) |
| return -ETIMEDOUT; |
| |
| if (init_packet->msg.init_msg.init_complete.status != |
| NVSP_STAT_SUCCESS) |
| return -EINVAL; |
| |
| if (nvsp_ver == NVSP_PROTOCOL_VERSION_1) |
| return 0; |
| |
| /* NVSPv2 only: Send NDIS config */ |
| memset(init_packet, 0, sizeof(struct nvsp_message)); |
| init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; |
| init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu; |
| init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; |
| |
| ret = vmbus_sendpacket(device->channel, init_packet, |
| sizeof(struct nvsp_message), |
| (unsigned long)init_packet, |
| VM_PKT_DATA_INBAND, 0); |
| |
| return ret; |
| } |
| |
| static int netvsc_connect_vsp(struct hv_device *device) |
| { |
| int ret; |
| struct netvsc_device *net_device; |
| struct nvsp_message *init_packet; |
| int ndis_version; |
| struct net_device *ndev; |
| u32 ver_list[] = { NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2, |
| NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 }; |
| int i, num_ver = 4; /* number of different NVSP versions */ |
| |
| net_device = get_outbound_net_device(device); |
| if (!net_device) |
| return -ENODEV; |
| ndev = net_device->ndev; |
| |
| init_packet = &net_device->channel_init_pkt; |
| |
| /* Negotiate the latest NVSP protocol supported */ |
| for (i = num_ver - 1; i >= 0; i--) |
| if (negotiate_nvsp_ver(device, net_device, init_packet, |
| ver_list[i]) == 0) { |
| net_device->nvsp_version = ver_list[i]; |
| break; |
| } |
| |
| if (i < 0) { |
| ret = -EPROTO; |
| goto cleanup; |
| } |
| |
| pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); |
| |
| /* Send the ndis version */ |
| memset(init_packet, 0, sizeof(struct nvsp_message)); |
| |
| if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4) |
| ndis_version = 0x00060001; |
| else |
| ndis_version = 0x0006001e; |
| |
| 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 */ |
| if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2) |
| net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY; |
| else |
| net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; |
| net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE; |
| |
| ret = netvsc_init_buf(device); |
| |
| cleanup: |
| return ret; |
| } |
| |
| static void netvsc_disconnect_vsp(struct netvsc_device *net_device) |
| { |
| netvsc_destroy_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; |
| unsigned long flags; |
| |
| net_device = hv_get_drvdata(device); |
| |
| netvsc_disconnect_vsp(net_device); |
| |
| /* |
| * Since we have already drained, we don't need to busy wait |
| * as was done in final_release_stor_device() |
| * Note that we cannot set the ext pointer to NULL until |
| * we have drained - to drain the outgoing packets, we need to |
| * allow incoming packets. |
| */ |
| |
| spin_lock_irqsave(&device->channel->inbound_lock, flags); |
| hv_set_drvdata(device, NULL); |
| spin_unlock_irqrestore(&device->channel->inbound_lock, flags); |
| |
| /* |
| * At this point, no one should be accessing net_device |
| * except in here |
| */ |
| dev_notice(&device->device, "net device safe to remove\n"); |
| |
| /* Now, we can close the channel safely */ |
| vmbus_close(device->channel); |
| |
| /* Release all resources */ |
| if (net_device->sub_cb_buf) |
| vfree(net_device->sub_cb_buf); |
| |
| kfree(net_device); |
| return 0; |
| } |
| |
| |
| #define RING_AVAIL_PERCENT_HIWATER 20 |
| #define RING_AVAIL_PERCENT_LOWATER 10 |
| |
| /* |
| * Get the percentage of available bytes to write in the ring. |
| * The return value is in range from 0 to 100. |
| */ |
| static inline u32 hv_ringbuf_avail_percent( |
| struct hv_ring_buffer_info *ring_info) |
| { |
| u32 avail_read, avail_write; |
| |
| hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); |
| |
| return avail_write * 100 / ring_info->ring_datasize; |
| } |
| |
| static inline void netvsc_free_send_slot(struct netvsc_device *net_device, |
| u32 index) |
| { |
| sync_change_bit(index, net_device->send_section_map); |
| } |
| |
| static void netvsc_send_completion(struct netvsc_device *net_device, |
| struct hv_device *device, |
| struct vmpacket_descriptor *packet) |
| { |
| struct nvsp_message *nvsp_packet; |
| struct hv_netvsc_packet *nvsc_packet; |
| struct net_device *ndev; |
| u32 send_index; |
| |
| ndev = net_device->ndev; |
| |
| 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) || |
| (nvsp_packet->hdr.msg_type == |
| NVSP_MSG5_TYPE_SUBCHANNEL)) { |
| /* 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) { |
| int num_outstanding_sends; |
| u16 q_idx = 0; |
| struct vmbus_channel *channel = device->channel; |
| int queue_sends; |
| |
| /* Get the send context */ |
| nvsc_packet = (struct hv_netvsc_packet *)(unsigned long) |
| packet->trans_id; |
| |
| /* Notify the layer above us */ |
| if (nvsc_packet) { |
| send_index = nvsc_packet->send_buf_index; |
| if (send_index != NETVSC_INVALID_INDEX) |
| netvsc_free_send_slot(net_device, send_index); |
| q_idx = nvsc_packet->q_idx; |
| channel = nvsc_packet->channel; |
| nvsc_packet->send_completion(nvsc_packet-> |
| send_completion_ctx); |
| } |
| |
| num_outstanding_sends = |
| atomic_dec_return(&net_device->num_outstanding_sends); |
| queue_sends = atomic_dec_return(&net_device-> |
| queue_sends[q_idx]); |
| |
| if (net_device->destroy && num_outstanding_sends == 0) |
| wake_up(&net_device->wait_drain); |
| |
| if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) && |
| !net_device->start_remove && |
| (hv_ringbuf_avail_percent(&channel->outbound) > |
| RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) |
| netif_tx_wake_queue(netdev_get_tx_queue( |
| ndev, q_idx)); |
| } else { |
| netdev_err(ndev, "Unknown send completion packet type- " |
| "%d received!!\n", nvsp_packet->hdr.msg_type); |
| } |
| |
| } |
| |
| static u32 netvsc_get_next_send_section(struct netvsc_device *net_device) |
| { |
| unsigned long index; |
| u32 max_words = net_device->map_words; |
| unsigned long *map_addr = (unsigned long *)net_device->send_section_map; |
| u32 section_cnt = net_device->send_section_cnt; |
| int ret_val = NETVSC_INVALID_INDEX; |
| int i; |
| int prev_val; |
| |
| for (i = 0; i < max_words; i++) { |
| if (!~(map_addr[i])) |
| continue; |
| index = ffz(map_addr[i]); |
| prev_val = sync_test_and_set_bit(index, &map_addr[i]); |
| if (prev_val) |
| continue; |
| if ((index + (i * BITS_PER_LONG)) >= section_cnt) |
| break; |
| ret_val = (index + (i * BITS_PER_LONG)); |
| break; |
| } |
| return ret_val; |
| } |
| |
| u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device, |
| unsigned int section_index, |
| struct hv_netvsc_packet *packet) |
| { |
| char *start = net_device->send_buf; |
| char *dest = (start + (section_index * net_device->send_section_size)); |
| int i; |
| u32 msg_size = 0; |
| |
| for (i = 0; i < packet->page_buf_cnt; i++) { |
| char *src = phys_to_virt(packet->page_buf[i].pfn << PAGE_SHIFT); |
| u32 offset = packet->page_buf[i].offset; |
| u32 len = packet->page_buf[i].len; |
| |
| memcpy(dest, (src + offset), len); |
| msg_size += len; |
| dest += len; |
| } |
| return msg_size; |
| } |
| |
| int netvsc_send(struct hv_device *device, |
| struct hv_netvsc_packet *packet) |
| { |
| struct netvsc_device *net_device; |
| int ret = 0; |
| struct nvsp_message sendMessage; |
| struct net_device *ndev; |
| struct vmbus_channel *out_channel = NULL; |
| u64 req_id; |
| unsigned int section_index = NETVSC_INVALID_INDEX; |
| u32 msg_size = 0; |
| struct sk_buff *skb = NULL; |
| u16 q_idx = packet->q_idx; |
| |
| |
| net_device = get_outbound_net_device(device); |
| if (!net_device) |
| return -ENODEV; |
| ndev = net_device->ndev; |
| |
| 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; |
| } |
| |
| /* Attempt to send via sendbuf */ |
| if (packet->total_data_buflen < net_device->send_section_size) { |
| section_index = netvsc_get_next_send_section(net_device); |
| if (section_index != NETVSC_INVALID_INDEX) { |
| msg_size = netvsc_copy_to_send_buf(net_device, |
| section_index, |
| packet); |
| skb = (struct sk_buff *) |
| (unsigned long)packet->send_completion_tid; |
| packet->page_buf_cnt = 0; |
| } |
| } |
| packet->send_buf_index = section_index; |
| |
| |
| sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index = |
| section_index; |
| sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = msg_size; |
| |
| if (packet->send_completion) |
| req_id = (ulong)packet; |
| else |
| req_id = 0; |
| |
| out_channel = net_device->chn_table[packet->q_idx]; |
| if (out_channel == NULL) |
| out_channel = device->channel; |
| packet->channel = out_channel; |
| |
| if (packet->page_buf_cnt) { |
| ret = vmbus_sendpacket_pagebuffer(out_channel, |
| packet->page_buf, |
| packet->page_buf_cnt, |
| &sendMessage, |
| sizeof(struct nvsp_message), |
| req_id); |
| } else { |
| ret = vmbus_sendpacket(out_channel, &sendMessage, |
| sizeof(struct nvsp_message), |
| req_id, |
| VM_PKT_DATA_INBAND, |
| VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
| } |
| |
| if (ret == 0) { |
| atomic_inc(&net_device->num_outstanding_sends); |
| atomic_inc(&net_device->queue_sends[q_idx]); |
| |
| if (hv_ringbuf_avail_percent(&out_channel->outbound) < |
| RING_AVAIL_PERCENT_LOWATER) { |
| netif_tx_stop_queue(netdev_get_tx_queue( |
| ndev, q_idx)); |
| |
| if (atomic_read(&net_device-> |
| queue_sends[q_idx]) < 1) |
| netif_tx_wake_queue(netdev_get_tx_queue( |
| ndev, q_idx)); |
| } |
| } else if (ret == -EAGAIN) { |
| netif_tx_stop_queue(netdev_get_tx_queue( |
| ndev, q_idx)); |
| if (atomic_read(&net_device->queue_sends[q_idx]) < 1) { |
| netif_tx_wake_queue(netdev_get_tx_queue( |
| ndev, q_idx)); |
| ret = -ENOSPC; |
| } |
| } else { |
| netdev_err(ndev, "Unable to send packet %p ret %d\n", |
| packet, ret); |
| } |
| |
| if (ret != 0) { |
| if (section_index != NETVSC_INVALID_INDEX) |
| netvsc_free_send_slot(net_device, section_index); |
| } else if (skb) { |
| dev_kfree_skb_any(skb); |
| } |
| |
| return ret; |
| } |
| |
| static void netvsc_send_recv_completion(struct hv_device *device, |
| struct vmbus_channel *channel, |
| struct netvsc_device *net_device, |
| u64 transaction_id, u32 status) |
| { |
| struct nvsp_message recvcompMessage; |
| int retries = 0; |
| int ret; |
| struct net_device *ndev; |
| |
| ndev = net_device->ndev; |
| |
| recvcompMessage.hdr.msg_type = |
| NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; |
| |
| recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status; |
| |
| retry_send_cmplt: |
| /* Send the completion */ |
| ret = vmbus_sendpacket(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++; |
| netdev_err(ndev, "unable to send receive completion pkt" |
| " (tid %llx)...retrying %d\n", transaction_id, retries); |
| |
| if (retries < 4) { |
| udelay(100); |
| goto retry_send_cmplt; |
| } else { |
| netdev_err(ndev, "unable to send receive " |
| "completion pkt (tid %llx)...give up retrying\n", |
| transaction_id); |
| } |
| } else { |
| netdev_err(ndev, "unable to send receive " |
| "completion pkt - %llx\n", transaction_id); |
| } |
| } |
| |
| static void netvsc_receive(struct netvsc_device *net_device, |
| struct vmbus_channel *channel, |
| struct hv_device *device, |
| struct vmpacket_descriptor *packet) |
| { |
| struct vmtransfer_page_packet_header *vmxferpage_packet; |
| struct nvsp_message *nvsp_packet; |
| struct hv_netvsc_packet nv_pkt; |
| struct hv_netvsc_packet *netvsc_packet = &nv_pkt; |
| u32 status = NVSP_STAT_SUCCESS; |
| int i; |
| int count = 0; |
| struct net_device *ndev; |
| |
| ndev = net_device->ndev; |
| |
| /* |
| * All inbound packets other than send completion should be xfer page |
| * packet |
| */ |
| if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { |
| netdev_err(ndev, "Unknown packet type received - %d\n", |
| packet->type); |
| 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) { |
| netdev_err(ndev, "Unknown nvsp packet type received-" |
| " %d\n", nvsp_packet->hdr.msg_type); |
| return; |
| } |
| |
| vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; |
| |
| if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { |
| netdev_err(ndev, "Invalid xfer page set id - " |
| "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID, |
| vmxferpage_packet->xfer_pageset_id); |
| return; |
| } |
| |
| count = vmxferpage_packet->range_cnt; |
| netvsc_packet->device = device; |
| netvsc_packet->channel = channel; |
| |
| /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ |
| for (i = 0; i < count; i++) { |
| /* Initialize the netvsc packet */ |
| netvsc_packet->status = NVSP_STAT_SUCCESS; |
| netvsc_packet->data = (void *)((unsigned long)net_device-> |
| recv_buf + vmxferpage_packet->ranges[i].byte_offset); |
| netvsc_packet->total_data_buflen = |
| vmxferpage_packet->ranges[i].byte_count; |
| |
| /* Pass it to the upper layer */ |
| rndis_filter_receive(device, netvsc_packet); |
| |
| if (netvsc_packet->status != NVSP_STAT_SUCCESS) |
| status = NVSP_STAT_FAIL; |
| } |
| |
| netvsc_send_recv_completion(device, channel, net_device, |
| vmxferpage_packet->d.trans_id, status); |
| } |
| |
| |
| static void netvsc_send_table(struct hv_device *hdev, |
| struct vmpacket_descriptor *vmpkt) |
| { |
| struct netvsc_device *nvscdev; |
| struct net_device *ndev; |
| struct nvsp_message *nvmsg; |
| int i; |
| u32 count, *tab; |
| |
| nvscdev = get_outbound_net_device(hdev); |
| if (!nvscdev) |
| return; |
| ndev = nvscdev->ndev; |
| |
| nvmsg = (struct nvsp_message *)((unsigned long)vmpkt + |
| (vmpkt->offset8 << 3)); |
| |
| if (nvmsg->hdr.msg_type != NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE) |
| return; |
| |
| count = nvmsg->msg.v5_msg.send_table.count; |
| if (count != VRSS_SEND_TAB_SIZE) { |
| netdev_err(ndev, "Received wrong send-table size:%u\n", count); |
| return; |
| } |
| |
| tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table + |
| nvmsg->msg.v5_msg.send_table.offset); |
| |
| for (i = 0; i < count; i++) |
| nvscdev->send_table[i] = tab[i]; |
| } |
| |
| void netvsc_channel_cb(void *context) |
| { |
| int ret; |
| struct vmbus_channel *channel = (struct vmbus_channel *)context; |
| struct hv_device *device; |
| struct netvsc_device *net_device; |
| u32 bytes_recvd; |
| u64 request_id; |
| struct vmpacket_descriptor *desc; |
| unsigned char *buffer; |
| int bufferlen = NETVSC_PACKET_SIZE; |
| struct net_device *ndev; |
| |
| if (channel->primary_channel != NULL) |
| device = channel->primary_channel->device_obj; |
| else |
| device = channel->device_obj; |
| |
| net_device = get_inbound_net_device(device); |
| if (!net_device) |
| return; |
| ndev = net_device->ndev; |
| buffer = get_per_channel_state(channel); |
| |
| do { |
| ret = vmbus_recvpacket_raw(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(net_device, |
| device, desc); |
| break; |
| |
| case VM_PKT_DATA_USING_XFER_PAGES: |
| netvsc_receive(net_device, channel, |
| device, desc); |
| break; |
| |
| case VM_PKT_DATA_INBAND: |
| netvsc_send_table(device, desc); |
| break; |
| |
| default: |
| netdev_err(ndev, |
| "unhandled packet type %d, " |
| "tid %llx len %d\n", |
| desc->type, request_id, |
| bytes_recvd); |
| break; |
| } |
| |
| } else { |
| /* |
| * We are done for this pass. |
| */ |
| break; |
| } |
| |
| } else if (ret == -ENOBUFS) { |
| if (bufferlen > NETVSC_PACKET_SIZE) |
| kfree(buffer); |
| /* Handle large packet */ |
| buffer = kmalloc(bytes_recvd, GFP_ATOMIC); |
| if (buffer == NULL) { |
| /* Try again next time around */ |
| netdev_err(ndev, |
| "unable to allocate buffer of size " |
| "(%d)!!\n", bytes_recvd); |
| break; |
| } |
| |
| bufferlen = bytes_recvd; |
| } |
| } while (1); |
| |
| if (bufferlen > NETVSC_PACKET_SIZE) |
| 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 ring_size = |
| ((struct netvsc_device_info *)additional_info)->ring_size; |
| struct netvsc_device *net_device; |
| struct net_device *ndev; |
| |
| net_device = alloc_net_device(device); |
| if (!net_device) { |
| ret = -ENOMEM; |
| goto cleanup; |
| } |
| |
| net_device->ring_size = ring_size; |
| |
| /* |
| * Coming into this function, struct net_device * is |
| * registered as the driver private data. |
| * In alloc_net_device(), we register struct netvsc_device * |
| * as the driver private data and stash away struct net_device * |
| * in struct netvsc_device *. |
| */ |
| ndev = net_device->ndev; |
| |
| /* Initialize the NetVSC channel extension */ |
| init_completion(&net_device->channel_init_wait); |
| |
| set_per_channel_state(device->channel, net_device->cb_buffer); |
| |
| /* Open the channel */ |
| ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, |
| ring_size * PAGE_SIZE, NULL, 0, |
| netvsc_channel_cb, device->channel); |
| |
| if (ret != 0) { |
| netdev_err(ndev, "unable to open channel: %d\n", ret); |
| goto cleanup; |
| } |
| |
| /* Channel is opened */ |
| pr_info("hv_netvsc channel opened successfully\n"); |
| |
| net_device->chn_table[0] = device->channel; |
| |
| /* Connect with the NetVsp */ |
| ret = netvsc_connect_vsp(device); |
| if (ret != 0) { |
| netdev_err(ndev, |
| "unable to connect to NetVSP - %d\n", ret); |
| goto close; |
| } |
| |
| return ret; |
| |
| close: |
| /* Now, we can close the channel safely */ |
| vmbus_close(device->channel); |
| |
| cleanup: |
| |
| if (net_device) |
| kfree(net_device); |
| |
| return ret; |
| } |