diff options
Diffstat (limited to 'sys/dev/hyperv/vmbus/hv_channel.c')
| -rw-r--r-- | sys/dev/hyperv/vmbus/hv_channel.c | 842 |
1 files changed, 842 insertions, 0 deletions
diff --git a/sys/dev/hyperv/vmbus/hv_channel.c b/sys/dev/hyperv/vmbus/hv_channel.c new file mode 100644 index 0000000..17dfd76 --- /dev/null +++ b/sys/dev/hyperv/vmbus/hv_channel.c @@ -0,0 +1,842 @@ +/*- + * Copyright (c) 2009-2012 Microsoft Corp. + * Copyright (c) 2012 NetApp Inc. + * Copyright (c) 2012 Citrix Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice unmodified, this list of conditions, and the following + * disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/param.h> +#include <sys/malloc.h> +#include <sys/systm.h> +#include <sys/mbuf.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#include <machine/bus.h> +#include <vm/vm.h> +#include <vm/vm_param.h> +#include <vm/pmap.h> + +#include "hv_vmbus_priv.h" + +static int vmbus_channel_create_gpadl_header( + /* must be phys and virt contiguous*/ + void* contig_buffer, + /* page-size multiple */ + uint32_t size, + hv_vmbus_channel_msg_info** msg_info, + uint32_t* message_count); + +static void vmbus_channel_set_event(hv_vmbus_channel* channel); + +/** + * @brief Trigger an event notification on the specified channel + */ +static void +vmbus_channel_set_event(hv_vmbus_channel *channel) +{ + hv_vmbus_monitor_page *monitor_page; + + if (channel->offer_msg.monitor_allocated) { + /* Each uint32_t represents 32 channels */ + synch_set_bit((channel->offer_msg.child_rel_id & 31), + ((uint32_t *)hv_vmbus_g_connection.send_interrupt_page + + ((channel->offer_msg.child_rel_id >> 5)))); + + monitor_page = (hv_vmbus_monitor_page *) + hv_vmbus_g_connection.monitor_pages; + + monitor_page++; /* Get the child to parent monitor page */ + + synch_set_bit(channel->monitor_bit, + (uint32_t *)&monitor_page-> + trigger_group[channel->monitor_group].pending); + } else { + hv_vmbus_set_event(channel->offer_msg.child_rel_id); + } + +} + +/** + * @brief Open the specified channel + */ +int +hv_vmbus_channel_open( + hv_vmbus_channel* new_channel, + uint32_t send_ring_buffer_size, + uint32_t recv_ring_buffer_size, + void* user_data, + uint32_t user_data_len, + hv_vmbus_pfn_channel_callback pfn_on_channel_callback, + void* context) +{ + + int ret = 0; + void *in, *out; + hv_vmbus_channel_open_channel* open_msg; + hv_vmbus_channel_msg_info* open_info; + + new_channel->on_channel_callback = pfn_on_channel_callback; + new_channel->channel_callback_context = context; + + /* Allocate the ring buffer */ + out = contigmalloc((send_ring_buffer_size + recv_ring_buffer_size), + M_DEVBUF, M_ZERO, 0UL, BUS_SPACE_MAXADDR, PAGE_SIZE, 0); + KASSERT(out != NULL, + ("Error VMBUS: contigmalloc failed to allocate Ring Buffer!")); + if (out == NULL) + return (ENOMEM); + + in = ((uint8_t *) out + send_ring_buffer_size); + + new_channel->ring_buffer_pages = out; + new_channel->ring_buffer_page_count = (send_ring_buffer_size + + recv_ring_buffer_size) >> PAGE_SHIFT; + + hv_vmbus_ring_buffer_init( + &new_channel->outbound, + out, + send_ring_buffer_size); + + hv_vmbus_ring_buffer_init( + &new_channel->inbound, + in, + recv_ring_buffer_size); + + /** + * Establish the gpadl for the ring buffer + */ + new_channel->ring_buffer_gpadl_handle = 0; + + ret = hv_vmbus_channel_establish_gpadl(new_channel, + new_channel->outbound.ring_buffer, + send_ring_buffer_size + recv_ring_buffer_size, + &new_channel->ring_buffer_gpadl_handle); + + /** + * Create and init the channel open message + */ + open_info = (hv_vmbus_channel_msg_info*) malloc( + sizeof(hv_vmbus_channel_msg_info) + + sizeof(hv_vmbus_channel_open_channel), + M_DEVBUF, + M_NOWAIT); + KASSERT(open_info != NULL, + ("Error VMBUS: malloc failed to allocate Open Channel message!")); + + if (open_info == NULL) + return (ENOMEM); + + sema_init(&open_info->wait_sema, 0, "Open Info Sema"); + + open_msg = (hv_vmbus_channel_open_channel*) open_info->msg; + open_msg->header.message_type = HV_CHANNEL_MESSAGE_OPEN_CHANNEL; + open_msg->open_id = new_channel->offer_msg.child_rel_id; + open_msg->child_rel_id = new_channel->offer_msg.child_rel_id; + open_msg->ring_buffer_gpadl_handle = + new_channel->ring_buffer_gpadl_handle; + open_msg->downstream_ring_buffer_page_offset = send_ring_buffer_size + >> PAGE_SHIFT; + open_msg->server_context_area_gpadl_handle = 0; + + if (user_data_len) + memcpy(open_msg->user_data, user_data, user_data_len); + + mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); + TAILQ_INSERT_TAIL( + &hv_vmbus_g_connection.channel_msg_anchor, + open_info, + msg_list_entry); + mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); + + ret = hv_vmbus_post_message( + open_msg, sizeof(hv_vmbus_channel_open_channel)); + + if (ret != 0) + goto cleanup; + + ret = sema_timedwait(&open_info->wait_sema, 500); /* KYS 5 seconds */ + + if (ret) + goto cleanup; + + if (open_info->response.open_result.status == 0) { + if(bootverbose) + printf("VMBUS: channel <%p> open success.\n", new_channel); + } else { + if(bootverbose) + printf("Error VMBUS: channel <%p> open failed - %d!\n", + new_channel, open_info->response.open_result.status); + } + + cleanup: + mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); + TAILQ_REMOVE( + &hv_vmbus_g_connection.channel_msg_anchor, + open_info, + msg_list_entry); + mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); + sema_destroy(&open_info->wait_sema); + free(open_info, M_DEVBUF); + + return (ret); +} + +/** + * @brief Create a gpadl for the specified buffer + */ +static int +vmbus_channel_create_gpadl_header( + void* contig_buffer, + uint32_t size, /* page-size multiple */ + hv_vmbus_channel_msg_info** msg_info, + uint32_t* message_count) +{ + int i; + int page_count; + unsigned long long pfn; + uint32_t msg_size; + hv_vmbus_channel_gpadl_header* gpa_header; + hv_vmbus_channel_gpadl_body* gpadl_body; + hv_vmbus_channel_msg_info* msg_header; + hv_vmbus_channel_msg_info* msg_body; + + int pfnSum, pfnCount, pfnLeft, pfnCurr, pfnSize; + + page_count = size >> PAGE_SHIFT; + pfn = hv_get_phys_addr(contig_buffer) >> PAGE_SHIFT; + + /*do we need a gpadl body msg */ + pfnSize = HV_MAX_SIZE_CHANNEL_MESSAGE + - sizeof(hv_vmbus_channel_gpadl_header) + - sizeof(hv_gpa_range); + pfnCount = pfnSize / sizeof(uint64_t); + + if (page_count > pfnCount) { /* if(we need a gpadl body) */ + /* fill in the header */ + msg_size = sizeof(hv_vmbus_channel_msg_info) + + sizeof(hv_vmbus_channel_gpadl_header) + + sizeof(hv_gpa_range) + + pfnCount * sizeof(uint64_t); + msg_header = malloc(msg_size, M_DEVBUF, M_NOWAIT | M_ZERO); + KASSERT( + msg_header != NULL, + ("Error VMBUS: malloc failed to allocate Gpadl Message!")); + if (msg_header == NULL) + return (ENOMEM); + + TAILQ_INIT(&msg_header->sub_msg_list_anchor); + msg_header->message_size = msg_size; + + gpa_header = (hv_vmbus_channel_gpadl_header*) msg_header->msg; + gpa_header->range_count = 1; + gpa_header->range_buf_len = sizeof(hv_gpa_range) + + page_count * sizeof(uint64_t); + gpa_header->range[0].byte_offset = 0; + gpa_header->range[0].byte_count = size; + for (i = 0; i < pfnCount; i++) { + gpa_header->range[0].pfn_array[i] = pfn + i; + } + *msg_info = msg_header; + *message_count = 1; + + pfnSum = pfnCount; + pfnLeft = page_count - pfnCount; + + /* + * figure out how many pfns we can fit + */ + pfnSize = HV_MAX_SIZE_CHANNEL_MESSAGE + - sizeof(hv_vmbus_channel_gpadl_body); + pfnCount = pfnSize / sizeof(uint64_t); + + /* + * fill in the body + */ + while (pfnLeft) { + if (pfnLeft > pfnCount) { + pfnCurr = pfnCount; + } else { + pfnCurr = pfnLeft; + } + + msg_size = sizeof(hv_vmbus_channel_msg_info) + + sizeof(hv_vmbus_channel_gpadl_body) + + pfnCurr * sizeof(uint64_t); + msg_body = malloc(msg_size, M_DEVBUF, M_NOWAIT | M_ZERO); + KASSERT( + msg_body != NULL, + ("Error VMBUS: malloc failed to allocate Gpadl msg_body!")); + if (msg_body == NULL) + return (ENOMEM); + + msg_body->message_size = msg_size; + (*message_count)++; + gpadl_body = + (hv_vmbus_channel_gpadl_body*) msg_body->msg; + /* + * gpadl_body->gpadl = kbuffer; + */ + for (i = 0; i < pfnCurr; i++) { + gpadl_body->pfn[i] = pfn + pfnSum + i; + } + + TAILQ_INSERT_TAIL( + &msg_header->sub_msg_list_anchor, + msg_body, + msg_list_entry); + pfnSum += pfnCurr; + pfnLeft -= pfnCurr; + } + } else { /* else everything fits in a header */ + + msg_size = sizeof(hv_vmbus_channel_msg_info) + + sizeof(hv_vmbus_channel_gpadl_header) + + sizeof(hv_gpa_range) + + page_count * sizeof(uint64_t); + msg_header = malloc(msg_size, M_DEVBUF, M_NOWAIT | M_ZERO); + KASSERT( + msg_header != NULL, + ("Error VMBUS: malloc failed to allocate Gpadl Message!")); + if (msg_header == NULL) + return (ENOMEM); + + msg_header->message_size = msg_size; + + gpa_header = (hv_vmbus_channel_gpadl_header*) msg_header->msg; + gpa_header->range_count = 1; + gpa_header->range_buf_len = sizeof(hv_gpa_range) + + page_count * sizeof(uint64_t); + gpa_header->range[0].byte_offset = 0; + gpa_header->range[0].byte_count = size; + for (i = 0; i < page_count; i++) { + gpa_header->range[0].pfn_array[i] = pfn + i; + } + + *msg_info = msg_header; + *message_count = 1; + } + + return (0); +} + +/** + * @brief Establish a GPADL for the specified buffer + */ +int +hv_vmbus_channel_establish_gpadl( + hv_vmbus_channel* channel, + void* contig_buffer, + uint32_t size, /* page-size multiple */ + uint32_t* gpadl_handle) + +{ + int ret = 0; + hv_vmbus_channel_gpadl_header* gpadl_msg; + hv_vmbus_channel_gpadl_body* gpadl_body; + hv_vmbus_channel_msg_info* msg_info; + hv_vmbus_channel_msg_info* sub_msg_info; + uint32_t msg_count; + hv_vmbus_channel_msg_info* curr; + uint32_t next_gpadl_handle; + + next_gpadl_handle = hv_vmbus_g_connection.next_gpadl_handle; + atomic_add_int((int*) &hv_vmbus_g_connection.next_gpadl_handle, 1); + + ret = vmbus_channel_create_gpadl_header( + contig_buffer, size, &msg_info, &msg_count); + + if(ret != 0) { /* if(allocation failed) return immediately */ + /* reverse atomic_add_int above */ + atomic_subtract_int((int*) + &hv_vmbus_g_connection.next_gpadl_handle, 1); + return ret; + } + + sema_init(&msg_info->wait_sema, 0, "Open Info Sema"); + gpadl_msg = (hv_vmbus_channel_gpadl_header*) msg_info->msg; + gpadl_msg->header.message_type = HV_CHANNEL_MESSAGEL_GPADL_HEADER; + gpadl_msg->child_rel_id = channel->offer_msg.child_rel_id; + gpadl_msg->gpadl = next_gpadl_handle; + + mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); + TAILQ_INSERT_TAIL( + &hv_vmbus_g_connection.channel_msg_anchor, + msg_info, + msg_list_entry); + + mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); + + ret = hv_vmbus_post_message( + gpadl_msg, + msg_info->message_size - + (uint32_t) sizeof(hv_vmbus_channel_msg_info)); + + if (ret != 0) + goto cleanup; + + if (msg_count > 1) { + TAILQ_FOREACH(curr, + &msg_info->sub_msg_list_anchor, msg_list_entry) { + sub_msg_info = curr; + gpadl_body = + (hv_vmbus_channel_gpadl_body*) sub_msg_info->msg; + + gpadl_body->header.message_type = + HV_CHANNEL_MESSAGE_GPADL_BODY; + gpadl_body->gpadl = next_gpadl_handle; + + ret = hv_vmbus_post_message( + gpadl_body, + sub_msg_info->message_size + - (uint32_t) sizeof(hv_vmbus_channel_msg_info)); + /* if (the post message failed) give up and clean up */ + if(ret != 0) + goto cleanup; + } + } + + ret = sema_timedwait(&msg_info->wait_sema, 500); /* KYS 5 seconds*/ + if (ret != 0) + goto cleanup; + + *gpadl_handle = gpadl_msg->gpadl; + +cleanup: + + mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); + TAILQ_REMOVE(&hv_vmbus_g_connection.channel_msg_anchor, + msg_info, msg_list_entry); + mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); + + sema_destroy(&msg_info->wait_sema); + free(msg_info, M_DEVBUF); + + return (ret); +} + +/** + * @brief Teardown the specified GPADL handle + */ +int +hv_vmbus_channel_teardown_gpdal( + hv_vmbus_channel* channel, + uint32_t gpadl_handle) +{ + int ret = 0; + hv_vmbus_channel_gpadl_teardown* msg; + hv_vmbus_channel_msg_info* info; + + info = (hv_vmbus_channel_msg_info *) + malloc( sizeof(hv_vmbus_channel_msg_info) + + sizeof(hv_vmbus_channel_gpadl_teardown), + M_DEVBUF, M_NOWAIT); + KASSERT(info != NULL, + ("Error VMBUS: malloc failed to allocate Gpadl Teardown Msg!")); + if (info == NULL) { + ret = ENOMEM; + goto cleanup; + } + + sema_init(&info->wait_sema, 0, "Open Info Sema"); + + msg = (hv_vmbus_channel_gpadl_teardown*) info->msg; + + msg->header.message_type = HV_CHANNEL_MESSAGE_GPADL_TEARDOWN; + msg->child_rel_id = channel->offer_msg.child_rel_id; + msg->gpadl = gpadl_handle; + + mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); + TAILQ_INSERT_TAIL(&hv_vmbus_g_connection.channel_msg_anchor, + info, msg_list_entry); + mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); + + ret = hv_vmbus_post_message(msg, + sizeof(hv_vmbus_channel_gpadl_teardown)); + if (ret != 0) + goto cleanup; + + ret = sema_timedwait(&info->wait_sema, 500); /* KYS 5 seconds */ + +cleanup: + /* + * Received a torndown response + */ + mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock); + TAILQ_REMOVE(&hv_vmbus_g_connection.channel_msg_anchor, + info, msg_list_entry); + mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock); + sema_destroy(&info->wait_sema); + free(info, M_DEVBUF); + + return (ret); +} + +/** + * @brief Close the specified channel + */ +void +hv_vmbus_channel_close(hv_vmbus_channel *channel) +{ + int ret = 0; + hv_vmbus_channel_close_channel* msg; + hv_vmbus_channel_msg_info* info; + + mtx_lock(&channel->inbound_lock); + channel->on_channel_callback = NULL; + mtx_unlock(&channel->inbound_lock); + + /** + * Send a closing message + */ + info = (hv_vmbus_channel_msg_info *) + malloc( sizeof(hv_vmbus_channel_msg_info) + + sizeof(hv_vmbus_channel_close_channel), + M_DEVBUF, M_NOWAIT); + KASSERT(info != NULL, ("VMBUS: malloc failed hv_vmbus_channel_close!")); + if(info == NULL) + return; + + msg = (hv_vmbus_channel_close_channel*) info->msg; + msg->header.message_type = HV_CHANNEL_MESSAGE_CLOSE_CHANNEL; + msg->child_rel_id = channel->offer_msg.child_rel_id; + + ret = hv_vmbus_post_message( + msg, sizeof(hv_vmbus_channel_close_channel)); + + /* Tear down the gpadl for the channel's ring buffer */ + if (channel->ring_buffer_gpadl_handle) { + hv_vmbus_channel_teardown_gpdal(channel, + channel->ring_buffer_gpadl_handle); + } + + /* TODO: Send a msg to release the childRelId */ + + /* cleanup the ring buffers for this channel */ + hv_ring_buffer_cleanup(&channel->outbound); + hv_ring_buffer_cleanup(&channel->inbound); + + contigfree( + channel->ring_buffer_pages, + channel->ring_buffer_page_count, + M_DEVBUF); + + free(info, M_DEVBUF); + + /* + * If we are closing the channel during an error path in + * opening the channel, don't free the channel + * since the caller will free the channel + */ + if (channel->state == HV_CHANNEL_OPEN_STATE) { + mtx_lock_spin(&hv_vmbus_g_connection.channel_lock); + TAILQ_REMOVE( + &hv_vmbus_g_connection.channel_anchor, + channel, + list_entry); + mtx_unlock_spin(&hv_vmbus_g_connection.channel_lock); + + hv_vmbus_free_vmbus_channel(channel); + } + +} + +/** + * @brief Send the specified buffer on the given channel + */ +int +hv_vmbus_channel_send_packet( + hv_vmbus_channel* channel, + void* buffer, + uint32_t buffer_len, + uint64_t request_id, + hv_vmbus_packet_type type, + uint32_t flags) +{ + int ret = 0; + hv_vm_packet_descriptor desc; + uint32_t packet_len; + uint64_t aligned_data; + uint32_t packet_len_aligned; + hv_vmbus_sg_buffer_list buffer_list[3]; + + packet_len = sizeof(hv_vm_packet_descriptor) + buffer_len; + packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); + aligned_data = 0; + + /* Setup the descriptor */ + desc.type = type; /* HV_VMBUS_PACKET_TYPE_DATA_IN_BAND; */ + desc.flags = flags; /* HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED */ + /* in 8-bytes granularity */ + desc.data_offset8 = sizeof(hv_vm_packet_descriptor) >> 3; + desc.length8 = (uint16_t) (packet_len_aligned >> 3); + desc.transaction_id = request_id; + + buffer_list[0].data = &desc; + buffer_list[0].length = sizeof(hv_vm_packet_descriptor); + + buffer_list[1].data = buffer; + buffer_list[1].length = buffer_len; + + buffer_list[2].data = &aligned_data; + buffer_list[2].length = packet_len_aligned - packet_len; + + ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3); + + /* TODO: We should determine if this is optional */ + if (ret == 0 + && !hv_vmbus_get_ring_buffer_interrupt_mask( + &channel->outbound)) { + vmbus_channel_set_event(channel); + } + + return (ret); +} + +/** + * @brief Send a range of single-page buffer packets using + * a GPADL Direct packet type + */ +int +hv_vmbus_channel_send_packet_pagebuffer( + hv_vmbus_channel* channel, + hv_vmbus_page_buffer page_buffers[], + uint32_t page_count, + void* buffer, + uint32_t buffer_len, + uint64_t request_id) +{ + + int ret = 0; + int i = 0; + uint32_t packet_len; + uint32_t packetLen_aligned; + hv_vmbus_sg_buffer_list buffer_list[3]; + hv_vmbus_channel_packet_page_buffer desc; + uint32_t descSize; + uint64_t alignedData = 0; + + if (page_count > HV_MAX_PAGE_BUFFER_COUNT) + return (EINVAL); + + /* + * Adjust the size down since hv_vmbus_channel_packet_page_buffer + * is the largest size we support + */ + descSize = sizeof(hv_vmbus_channel_packet_page_buffer) - + ((HV_MAX_PAGE_BUFFER_COUNT - page_count) * + sizeof(hv_vmbus_page_buffer)); + packet_len = descSize + buffer_len; + packetLen_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); + + /* Setup the descriptor */ + desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; + desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; + desc.data_offset8 = descSize >> 3; /* in 8-bytes granularity */ + desc.length8 = (uint16_t) (packetLen_aligned >> 3); + desc.transaction_id = request_id; + desc.range_count = page_count; + + for (i = 0; i < page_count; i++) { + desc.range[i].length = page_buffers[i].length; + desc.range[i].offset = page_buffers[i].offset; + desc.range[i].pfn = page_buffers[i].pfn; + } + + buffer_list[0].data = &desc; + buffer_list[0].length = descSize; + + buffer_list[1].data = buffer; + buffer_list[1].length = buffer_len; + + buffer_list[2].data = &alignedData; + buffer_list[2].length = packetLen_aligned - packet_len; + + ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3); + + /* TODO: We should determine if this is optional */ + if (ret == 0 && + !hv_vmbus_get_ring_buffer_interrupt_mask(&channel->outbound)) { + vmbus_channel_set_event(channel); + } + + return (ret); +} + +/** + * @brief Send a multi-page buffer packet using a GPADL Direct packet type + */ +int +hv_vmbus_channel_send_packet_multipagebuffer( + hv_vmbus_channel* channel, + hv_vmbus_multipage_buffer* multi_page_buffer, + void* buffer, + uint32_t buffer_len, + uint64_t request_id) +{ + + int ret = 0; + uint32_t desc_size; + uint32_t packet_len; + uint32_t packet_len_aligned; + uint32_t pfn_count; + uint64_t aligned_data = 0; + hv_vmbus_sg_buffer_list buffer_list[3]; + hv_vmbus_channel_packet_multipage_buffer desc; + + pfn_count = + HV_NUM_PAGES_SPANNED( + multi_page_buffer->offset, + multi_page_buffer->length); + + if ((pfn_count == 0) || (pfn_count > HV_MAX_MULTIPAGE_BUFFER_COUNT)) + return (EINVAL); + /* + * Adjust the size down since hv_vmbus_channel_packet_multipage_buffer + * is the largest size we support + */ + desc_size = + sizeof(hv_vmbus_channel_packet_multipage_buffer) - + ((HV_MAX_MULTIPAGE_BUFFER_COUNT - pfn_count) * + sizeof(uint64_t)); + packet_len = desc_size + buffer_len; + packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); + + /* + * Setup the descriptor + */ + desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; + desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; + desc.data_offset8 = desc_size >> 3; /* in 8-bytes granularity */ + desc.length8 = (uint16_t) (packet_len_aligned >> 3); + desc.transaction_id = request_id; + desc.range_count = 1; + + desc.range.length = multi_page_buffer->length; + desc.range.offset = multi_page_buffer->offset; + + memcpy(desc.range.pfn_array, multi_page_buffer->pfn_array, + pfn_count * sizeof(uint64_t)); + + buffer_list[0].data = &desc; + buffer_list[0].length = desc_size; + + buffer_list[1].data = buffer; + buffer_list[1].length = buffer_len; + + buffer_list[2].data = &aligned_data; + buffer_list[2].length = packet_len_aligned - packet_len; + + ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3); + + /* TODO: We should determine if this is optional */ + if (ret == 0 && + !hv_vmbus_get_ring_buffer_interrupt_mask(&channel->outbound)) { + vmbus_channel_set_event(channel); + } + + return (ret); +} + +/** + * @brief Retrieve the user packet on the specified channel + */ +int +hv_vmbus_channel_recv_packet( + hv_vmbus_channel* channel, + void* Buffer, + uint32_t buffer_len, + uint32_t* buffer_actual_len, + uint64_t* request_id) +{ + int ret; + uint32_t user_len; + uint32_t packet_len; + hv_vm_packet_descriptor desc; + + *buffer_actual_len = 0; + *request_id = 0; + + ret = hv_ring_buffer_peek(&channel->inbound, &desc, + sizeof(hv_vm_packet_descriptor)); + if (ret != 0) + return (0); + + packet_len = desc.length8 << 3; + user_len = packet_len - (desc.data_offset8 << 3); + + *buffer_actual_len = user_len; + + if (user_len > buffer_len) + return (EINVAL); + + *request_id = desc.transaction_id; + + /* Copy over the packet to the user buffer */ + ret = hv_ring_buffer_read(&channel->inbound, Buffer, user_len, + (desc.data_offset8 << 3)); + + return (0); +} + +/** + * @brief Retrieve the raw packet on the specified channel + */ +int +hv_vmbus_channel_recv_packet_raw( + hv_vmbus_channel* channel, + void* buffer, + uint32_t buffer_len, + uint32_t* buffer_actual_len, + uint64_t* request_id) +{ + int ret; + uint32_t packetLen; + uint32_t userLen; + hv_vm_packet_descriptor desc; + + *buffer_actual_len = 0; + *request_id = 0; + + ret = hv_ring_buffer_peek( + &channel->inbound, &desc, + sizeof(hv_vm_packet_descriptor)); + + if (ret != 0) + return (0); + + packetLen = desc.length8 << 3; + userLen = packetLen - (desc.data_offset8 << 3); + + *buffer_actual_len = packetLen; + + if (packetLen > buffer_len) + return (ENOBUFS); + + *request_id = desc.transaction_id; + + /* Copy over the entire packet to the user buffer */ + ret = hv_ring_buffer_read(&channel->inbound, buffer, packetLen, 0); + + return (0); +} |
