diff options
Diffstat (limited to 'drivers/staging/hv/netvsc.c')
| -rw-r--r-- | drivers/staging/hv/netvsc.c | 944 |
1 files changed, 0 insertions, 944 deletions
diff --git a/drivers/staging/hv/netvsc.c b/drivers/staging/hv/netvsc.c deleted file mode 100644 index b902579c7fe..00000000000 --- a/drivers/staging/hv/netvsc.c +++ /dev/null @@ -1,944 +0,0 @@ -/* - * 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 <linux/netdevice.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; - - - 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_recv_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 */ - 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; - struct net_device *ndev; - - net_device = get_outbound_net_device(device); - if (!net_device) - return -ENODEV; - ndev = net_device->ndev; - - net_device->recv_buf = - (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, - get_order(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 = 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: - 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; - struct net_device *ndev; - - net_device = get_outbound_net_device(device); - if (!net_device) - return -ENODEV; - ndev = net_device->ndev; - - 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: - 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; - - net_device = hv_get_drvdata(device); - 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_info(&device->device, - "waiting for %d requests to complete...\n", - atomic_read(&net_device->num_outstanding_sends)); - udelay(100); - } - - 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 */ - 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; - struct net_device *ndev; - - net_device = get_inbound_net_device(device); - if (!net_device) - return; - 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)) { - /* 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 { - netdev_err(ndev, "Unknown send completion packet type- " - "%d received!!\n", nvsp_packet->hdr.msg_type); - } - -} - -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; - - 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; - } - - /* 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) - netdev_err(ndev, "Unable to send packet %p ret %d\n", - packet, ret); - else - atomic_inc(&net_device->num_outstanding_sends); - - return ret; -} - -static void netvsc_send_recv_completion(struct hv_device *device, - u64 transaction_id) -{ - struct nvsp_message recvcompMessage; - int retries = 0; - int ret; - struct net_device *ndev; - struct netvsc_device *net_device = hv_get_drvdata(device); - - ndev = net_device->ndev; - - 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++; - 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); - } -} - -/* 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; - struct net_device *ndev; - - /* - * 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) - return; - ndev = net_device->ndev; - - /* 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); - -} - -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; - struct net_device *ndev; - - LIST_HEAD(listHead); - - net_device = get_inbound_net_device(device); - if (!net_device) - return; - 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; - } - - /* - * 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) { - netdev_err(ndev, "Got only %d netvsc pkt...needed " - "%d pkts. Dropping this xfer page packet completely!\n", - 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); - - 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) { - netdev_err(ndev, "Needed %d netvsc pkts to satisfy " - "this xfer page...got %d\n", - 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); - } - -} - -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; - struct net_device *ndev; - - 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) - goto out; - ndev = net_device->ndev; - - 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: - netdev_err(ndev, - "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 */ - netdev_err(ndev, - "unable to allocate buffer of size " - "(%d)!!\n", bytes_recvd); - break; - } - - bufferlen = bytes_recvd; - } - } while (1); - -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; - struct net_device *ndev; - - net_device = alloc_net_device(device); - if (!net_device) { - ret = -ENOMEM; - goto cleanup; - } - - /* - * 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 */ - 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) { - netdev_err(ndev, "unable to open channel: %d\n", ret); - goto cleanup; - } - - /* Channel is opened */ - pr_info("hv_netvsc channel opened successfully\n"); - - /* 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) { - list_for_each_entry_safe(packet, pos, - &net_device->recv_pkt_list, - list_ent) { - list_del(&packet->list_ent); - kfree(packet); - } - - kfree(net_device); - } - - return ret; -} |