diff options
author | 2016-06-03 03:33:22 +0000 | |
---|---|---|
committer | 2016-06-03 03:33:23 +0000 | |
commit | da27230f80795d0028333713f036d44c53cb0e68 (patch) | |
tree | b3d379eaf000adf72b36cb01cdf4d79c3e3f064c /qemu/roms/ipxe/src/drivers/net/netvsc.c | |
parent | 0e68cb048bb8aadb14675f5d4286d8ab2fc35449 (diff) | |
parent | 437fd90c0250dee670290f9b714253671a990160 (diff) |
Merge "These changes are the raw update to qemu-2.6."
Diffstat (limited to 'qemu/roms/ipxe/src/drivers/net/netvsc.c')
-rw-r--r-- | qemu/roms/ipxe/src/drivers/net/netvsc.c | 848 |
1 files changed, 848 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/drivers/net/netvsc.c b/qemu/roms/ipxe/src/drivers/net/netvsc.c new file mode 100644 index 000000000..d269cd63e --- /dev/null +++ b/qemu/roms/ipxe/src/drivers/net/netvsc.c @@ -0,0 +1,848 @@ +/* + * Copyright (C) 2014 Michael Brown <mbrown@fensystems.co.uk>. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that 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., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + * + * You can also choose to distribute this program under the terms of + * the Unmodified Binary Distribution Licence (as given in the file + * COPYING.UBDL), provided that you have satisfied its requirements. + */ + +FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); + +/** @file + * + * Hyper-V network virtual service client + * + * The network virtual service client (NetVSC) connects to the network + * virtual service provider (NetVSP) via the Hyper-V virtual machine + * bus (VMBus). It provides a transport layer for RNDIS packets. + */ + +#include <errno.h> +#include <unistd.h> +#include <byteswap.h> +#include <ipxe/umalloc.h> +#include <ipxe/rndis.h> +#include <ipxe/vmbus.h> +#include "netvsc.h" + +/** + * Send control message and wait for completion + * + * @v netvsc NetVSC device + * @v xrid Relative transaction ID + * @v data Data + * @v len Length of data + * @ret rc Return status code + */ +static int netvsc_control ( struct netvsc_device *netvsc, unsigned int xrid, + const void *data, size_t len ) { + uint64_t xid = ( NETVSC_BASE_XID + xrid ); + unsigned int i; + int rc; + + /* Send control message */ + if ( ( rc = vmbus_send_control ( netvsc->vmdev, xid, data, len ) ) !=0){ + DBGC ( netvsc, "NETVSC %s could not send control message: %s\n", + netvsc->name, strerror ( rc ) ); + return rc; + } + + /* Record transaction ID */ + netvsc->wait_xrid = xrid; + + /* Wait for operation to complete */ + for ( i = 0 ; i < NETVSC_MAX_WAIT_MS ; i++ ) { + + /* Check for completion */ + if ( ! netvsc->wait_xrid ) + return netvsc->wait_rc; + + /* Poll VMBus device */ + vmbus_poll ( netvsc->vmdev ); + + /* Delay for 1ms */ + mdelay ( 1 ); + } + + DBGC ( netvsc, "NETVSC %s timed out waiting for XRID %d\n", + netvsc->name, xrid ); + vmbus_dump_channel ( netvsc->vmdev ); + return -ETIMEDOUT; +} + +/** + * Handle generic completion + * + * @v netvsc NetVSC device + * @v data Data + * @v len Length of data + * @ret rc Return status code + */ +static int netvsc_completed ( struct netvsc_device *netvsc __unused, + const void *data __unused, size_t len __unused ) { + return 0; +} + +/** + * Initialise communication + * + * @v netvsc NetVSC device + * @ret rc Return status code + */ +static int netvsc_initialise ( struct netvsc_device *netvsc ) { + struct netvsc_init_message msg; + int rc; + + /* Construct message */ + memset ( &msg, 0, sizeof ( msg ) ); + msg.header.type = cpu_to_le32 ( NETVSC_INIT_MSG ); + msg.min = cpu_to_le32 ( NETVSC_VERSION_1 ); + msg.max = cpu_to_le32 ( NETVSC_VERSION_1 ); + + /* Send message and wait for completion */ + if ( ( rc = netvsc_control ( netvsc, NETVSC_INIT_XRID, &msg, + sizeof ( msg ) ) ) != 0 ) { + DBGC ( netvsc, "NETVSC %s could not initialise: %s\n", + netvsc->name, strerror ( rc ) ); + return rc; + } + + return 0; +} + +/** + * Handle initialisation completion + * + * @v netvsc NetVSC device + * @v data Data + * @v len Length of data + * @ret rc Return status code + */ +static int +netvsc_initialised ( struct netvsc_device *netvsc, const void *data, + size_t len ) { + const struct netvsc_init_completion *cmplt = data; + + /* Check completion */ + if ( len < sizeof ( *cmplt ) ) { + DBGC ( netvsc, "NETVSC %s underlength initialisation " + "completion (%zd bytes)\n", netvsc->name, len ); + return -EINVAL; + } + if ( cmplt->header.type != cpu_to_le32 ( NETVSC_INIT_CMPLT ) ) { + DBGC ( netvsc, "NETVSC %s unexpected initialisation completion " + "type %d\n", netvsc->name, + le32_to_cpu ( cmplt->header.type ) ); + return -EPROTO; + } + if ( cmplt->status != cpu_to_le32 ( NETVSC_OK ) ) { + DBGC ( netvsc, "NETVSC %s initialisation failure status %d\n", + netvsc->name, le32_to_cpu ( cmplt->status ) ); + return -EPROTO; + } + + return 0; +} + +/** + * Set NDIS version + * + * @v netvsc NetVSC device + * @ret rc Return status code + */ +static int netvsc_ndis_version ( struct netvsc_device *netvsc ) { + struct netvsc_ndis_version_message msg; + int rc; + + /* Construct message */ + memset ( &msg, 0, sizeof ( msg ) ); + msg.header.type = cpu_to_le32 ( NETVSC_NDIS_VERSION_MSG ); + msg.major = cpu_to_le32 ( NETVSC_NDIS_MAJOR ); + msg.minor = cpu_to_le32 ( NETVSC_NDIS_MINOR ); + + /* Send message and wait for completion */ + if ( ( rc = netvsc_control ( netvsc, NETVSC_NDIS_VERSION_XRID, + &msg, sizeof ( msg ) ) ) != 0 ) { + DBGC ( netvsc, "NETVSC %s could not set NDIS version: %s\n", + netvsc->name, strerror ( rc ) ); + return rc; + } + + return 0; +} + +/** + * Establish data buffer + * + * @v netvsc NetVSC device + * @v buffer Data buffer + * @ret rc Return status code + */ +static int netvsc_establish_buffer ( struct netvsc_device *netvsc, + struct netvsc_buffer *buffer ) { + struct netvsc_establish_buffer_message msg; + int rc; + + /* Construct message */ + memset ( &msg, 0, sizeof ( msg ) ); + msg.header.type = cpu_to_le32 ( buffer->establish_type ); + msg.gpadl = cpu_to_le32 ( buffer->gpadl ); + msg.pageset = buffer->pages.pageset; /* Already protocol-endian */ + + /* Send message and wait for completion */ + if ( ( rc = netvsc_control ( netvsc, buffer->establish_xrid, &msg, + sizeof ( msg ) ) ) != 0 ) { + DBGC ( netvsc, "NETVSC %s could not establish buffer: %s\n", + netvsc->name, strerror ( rc ) ); + return rc; + } + + return 0; +} + +/** + * Handle establish receive data buffer completion + * + * @v netvsc NetVSC device + * @v data Data + * @v len Length of data + * @ret rc Return status code + */ +static int netvsc_rx_established_buffer ( struct netvsc_device *netvsc, + const void *data, size_t len ) { + const struct netvsc_rx_establish_buffer_completion *cmplt = data; + + /* Check completion */ + if ( len < sizeof ( *cmplt ) ) { + DBGC ( netvsc, "NETVSC %s underlength buffer completion (%zd " + "bytes)\n", netvsc->name, len ); + return -EINVAL; + } + if ( cmplt->header.type != cpu_to_le32 ( NETVSC_RX_ESTABLISH_CMPLT ) ) { + DBGC ( netvsc, "NETVSC %s unexpected buffer completion type " + "%d\n", netvsc->name, le32_to_cpu ( cmplt->header.type)); + return -EPROTO; + } + if ( cmplt->status != cpu_to_le32 ( NETVSC_OK ) ) { + DBGC ( netvsc, "NETVSC %s buffer failure status %d\n", + netvsc->name, le32_to_cpu ( cmplt->status ) ); + return -EPROTO; + } + + return 0; +} + +/** + * Revoke data buffer + * + * @v netvsc NetVSC device + * @v buffer Data buffer + * @ret rc Return status code + */ +static int netvsc_revoke_buffer ( struct netvsc_device *netvsc, + struct netvsc_buffer *buffer ) { + struct netvsc_revoke_buffer_message msg; + int rc; + + /* Construct message */ + memset ( &msg, 0, sizeof ( msg ) ); + msg.header.type = cpu_to_le32 ( buffer->revoke_type ); + msg.pageset = buffer->pages.pageset; /* Already protocol-endian */ + + /* Send message and wait for completion */ + if ( ( rc = netvsc_control ( netvsc, buffer->revoke_xrid, + &msg, sizeof ( msg ) ) ) != 0 ) { + DBGC ( netvsc, "NETVSC %s could not revoke buffer: %s\n", + netvsc->name, strerror ( rc ) ); + return rc; + } + + return 0; +} + +/** + * Handle received control packet + * + * @v vmdev VMBus device + * @v xid Transaction ID + * @v data Data + * @v len Length of data + * @ret rc Return status code + */ +static int netvsc_recv_control ( struct vmbus_device *vmdev, uint64_t xid, + const void *data, size_t len ) { + struct rndis_device *rndis = vmbus_get_drvdata ( vmdev ); + struct netvsc_device *netvsc = rndis->priv; + + DBGC ( netvsc, "NETVSC %s received unsupported control packet " + "(%08llx):\n", netvsc->name, xid ); + DBGC_HDA ( netvsc, 0, data, len ); + return -ENOTSUP; +} + +/** + * Handle received data packet + * + * @v vmdev VMBus device + * @v xid Transaction ID + * @v data Data + * @v len Length of data + * @v list List of I/O buffers + * @ret rc Return status code + */ +static int netvsc_recv_data ( struct vmbus_device *vmdev, uint64_t xid, + const void *data, size_t len, + struct list_head *list ) { + struct rndis_device *rndis = vmbus_get_drvdata ( vmdev ); + struct netvsc_device *netvsc = rndis->priv; + const struct netvsc_rndis_message *msg = data; + struct io_buffer *iobuf; + struct io_buffer *tmp; + int rc; + + /* Sanity check */ + if ( len < sizeof ( *msg ) ) { + DBGC ( netvsc, "NETVSC %s received underlength RNDIS packet " + "(%zd bytes)\n", netvsc->name, len ); + rc = -EINVAL; + goto err_sanity; + } + if ( msg->header.type != cpu_to_le32 ( NETVSC_RNDIS_MSG ) ) { + DBGC ( netvsc, "NETVSC %s received unexpected RNDIS packet " + "type %d\n", netvsc->name, + le32_to_cpu ( msg->header.type ) ); + rc = -EINVAL; + goto err_sanity; + } + + /* Send completion back to host */ + if ( ( rc = vmbus_send_completion ( vmdev, xid, NULL, 0 ) ) != 0 ) { + DBGC ( netvsc, "NETVSC %s could not send completion: %s\n", + netvsc->name, strerror ( rc ) ); + goto err_completion; + } + + /* Hand off to RNDIS */ + list_for_each_entry_safe ( iobuf, tmp, list, list ) { + list_del ( &iobuf->list ); + rndis_rx ( rndis, iob_disown ( iobuf ) ); + } + + return 0; + + err_completion: + err_sanity: + list_for_each_entry_safe ( iobuf, tmp, list, list ) { + list_del ( &iobuf->list ); + free_iob ( iobuf ); + } + return rc; +} + +/** + * Handle received completion packet + * + * @v vmdev VMBus device + * @v xid Transaction ID + * @v data Data + * @v len Length of data + * @ret rc Return status code + */ +static int netvsc_recv_completion ( struct vmbus_device *vmdev, uint64_t xid, + const void *data, size_t len ) { + struct rndis_device *rndis = vmbus_get_drvdata ( vmdev ); + struct netvsc_device *netvsc = rndis->priv; + struct io_buffer *iobuf; + int ( * completion ) ( struct netvsc_device *netvsc, + const void *data, size_t len ); + unsigned int xrid = ( xid - NETVSC_BASE_XID ); + unsigned int tx_id; + int rc; + + /* Handle transmit completion, if applicable */ + tx_id = ( xrid - NETVSC_TX_BASE_XRID ); + if ( ( tx_id < NETVSC_TX_NUM_DESC ) && + ( ( iobuf = netvsc->tx.iobufs[tx_id] ) != NULL ) ) { + + /* Free buffer ID */ + netvsc->tx.iobufs[tx_id] = NULL; + netvsc->tx.ids[ ( netvsc->tx.id_cons++ ) & + ( netvsc->tx.count - 1 ) ] = tx_id; + + /* Hand back to RNDIS */ + rndis_tx_complete ( rndis, iobuf ); + return 0; + } + + /* Otherwise determine completion handler */ + if ( xrid == NETVSC_INIT_XRID ) { + completion = netvsc_initialised; + } else if ( xrid == NETVSC_RX_ESTABLISH_XRID ) { + completion = netvsc_rx_established_buffer; + } else if ( ( netvsc->wait_xrid != 0 ) && + ( xrid == netvsc->wait_xrid ) ) { + completion = netvsc_completed; + } else { + DBGC ( netvsc, "NETVSC %s received unexpected completion " + "(%08llx)\n", netvsc->name, xid ); + return -EPIPE; + } + + /* Hand off to completion handler */ + rc = completion ( netvsc, data, len ); + + /* Record completion handler result if applicable */ + if ( xrid == netvsc->wait_xrid ) { + netvsc->wait_xrid = 0; + netvsc->wait_rc = rc; + } + + return rc; +} + +/** + * Handle received cancellation packet + * + * @v vmdev VMBus device + * @v xid Transaction ID + * @ret rc Return status code + */ +static int netvsc_recv_cancellation ( struct vmbus_device *vmdev, + uint64_t xid ) { + struct rndis_device *rndis = vmbus_get_drvdata ( vmdev ); + struct netvsc_device *netvsc = rndis->priv; + + DBGC ( netvsc, "NETVSC %s received unsupported cancellation packet " + "(%08llx):\n", netvsc->name, xid ); + return -ENOTSUP; +} + +/** VMBus channel operations */ +static struct vmbus_channel_operations netvsc_channel_operations = { + .recv_control = netvsc_recv_control, + .recv_data = netvsc_recv_data, + .recv_completion = netvsc_recv_completion, + .recv_cancellation = netvsc_recv_cancellation, +}; + +/** + * Poll for completed and received packets + * + * @v rndis RNDIS device + */ +static void netvsc_poll ( struct rndis_device *rndis ) { + struct netvsc_device *netvsc = rndis->priv; + struct vmbus_device *vmdev = netvsc->vmdev; + + /* Poll VMBus device */ + while ( vmbus_has_data ( vmdev ) ) + vmbus_poll ( vmdev ); +} + +/** + * Transmit packet + * + * @v rndis RNDIS device + * @v iobuf I/O buffer + * @ret rc Return status code + * + * If this method returns success then the RNDIS device must + * eventually report completion via rndis_tx_complete(). + */ +static int netvsc_transmit ( struct rndis_device *rndis, + struct io_buffer *iobuf ) { + struct netvsc_device *netvsc = rndis->priv; + struct rndis_header *header = iobuf->data; + struct netvsc_rndis_message msg; + unsigned int tx_id; + unsigned int xrid; + uint64_t xid; + int rc; + + /* Sanity check */ + assert ( iob_len ( iobuf ) >= sizeof ( *header ) ); + assert ( iob_len ( iobuf ) == le32_to_cpu ( header->len ) ); + + /* Check that we have space in the transmit ring */ + if ( netvsc_ring_is_full ( &netvsc->tx ) ) + return rndis_tx_defer ( rndis, iobuf ); + + /* Allocate buffer ID and calculate transaction ID */ + tx_id = netvsc->tx.ids[ netvsc->tx.id_prod & ( netvsc->tx.count - 1 ) ]; + assert ( netvsc->tx.iobufs[tx_id] == NULL ); + xrid = ( NETVSC_TX_BASE_XRID + tx_id ); + xid = ( NETVSC_BASE_XID + xrid ); + + /* Construct message */ + memset ( &msg, 0, sizeof ( msg ) ); + msg.header.type = cpu_to_le32 ( NETVSC_RNDIS_MSG ); + msg.channel = ( ( header->type == cpu_to_le32 ( RNDIS_PACKET_MSG ) ) ? + NETVSC_RNDIS_DATA : NETVSC_RNDIS_CONTROL ); + msg.buffer = cpu_to_le32 ( NETVSC_RNDIS_NO_BUFFER ); + + /* Send message */ + if ( ( rc = vmbus_send_data ( netvsc->vmdev, xid, &msg, sizeof ( msg ), + iobuf ) ) != 0 ) { + DBGC ( netvsc, "NETVSC %s could not send RNDIS message: %s\n", + netvsc->name, strerror ( rc ) ); + return rc; + } + + /* Store I/O buffer and consume buffer ID */ + netvsc->tx.iobufs[tx_id] = iobuf; + netvsc->tx.id_prod++; + + return 0; +} + +/** + * Cancel transmission + * + * @v netvsc NetVSC device + * @v iobuf I/O buffer + * @v tx_id Transmission ID + */ +static void netvsc_cancel_transmit ( struct netvsc_device *netvsc, + struct io_buffer *iobuf, + unsigned int tx_id ) { + unsigned int xrid; + uint64_t xid; + + /* Send cancellation */ + xrid = ( NETVSC_TX_BASE_XRID + tx_id ); + xid = ( NETVSC_BASE_XID + xrid ); + DBGC ( netvsc, "NETVSC %s cancelling transmission %#x\n", + netvsc->name, tx_id ); + vmbus_send_cancellation ( netvsc->vmdev, xid ); + + /* Report back to RNDIS */ + rndis_tx_complete_err ( netvsc->rndis, iobuf, -ECANCELED ); +} + +/** + * Create descriptor ring + * + * @v netvsc NetVSC device + * @v ring Descriptor ring + * @ret rc Return status code + */ +static int netvsc_create_ring ( struct netvsc_device *netvsc __unused, + struct netvsc_ring *ring ) { + unsigned int i; + + /* Initialise buffer ID ring */ + for ( i = 0 ; i < ring->count ; i++ ) { + ring->ids[i] = i; + assert ( ring->iobufs[i] == NULL ); + } + ring->id_prod = 0; + ring->id_cons = 0; + + return 0; +} + +/** + * Destroy descriptor ring + * + * @v netvsc NetVSC device + * @v ring Descriptor ring + * @v discard Method used to discard outstanding buffer, or NULL + */ +static void netvsc_destroy_ring ( struct netvsc_device *netvsc, + struct netvsc_ring *ring, + void ( * discard ) ( struct netvsc_device *, + struct io_buffer *, + unsigned int ) ) { + struct io_buffer *iobuf; + unsigned int i; + + /* Flush any outstanding buffers */ + for ( i = 0 ; i < ring->count ; i++ ) { + iobuf = ring->iobufs[i]; + if ( ! iobuf ) + continue; + ring->iobufs[i] = NULL; + ring->ids[ ( ring->id_cons++ ) & ( ring->count - 1 ) ] = i; + if ( discard ) + discard ( netvsc, iobuf, i ); + } + + /* Sanity check */ + assert ( netvsc_ring_is_empty ( ring ) ); +} + +/** + * Copy data from data buffer + * + * @v pages Transfer page set + * @v data Data buffer + * @v offset Offset within page set + * @v len Length within page set + * @ret rc Return status code + */ +static int netvsc_buffer_copy ( struct vmbus_xfer_pages *pages, void *data, + size_t offset, size_t len ) { + struct netvsc_buffer *buffer = + container_of ( pages, struct netvsc_buffer, pages ); + + /* Sanity check */ + if ( ( offset > buffer->len ) || ( len > ( buffer->len - offset ) ) ) + return -ERANGE; + + /* Copy data from buffer */ + copy_from_user ( data, buffer->data, offset, len ); + + return 0; +} + +/** Transfer page set operations */ +static struct vmbus_xfer_pages_operations netvsc_xfer_pages_operations = { + .copy = netvsc_buffer_copy, +}; + +/** + * Create data buffer + * + * @v netvsc NetVSC device + * @v buffer Data buffer + * @ret rc Return status code + */ +static int netvsc_create_buffer ( struct netvsc_device *netvsc, + struct netvsc_buffer *buffer ) { + struct vmbus_device *vmdev = netvsc->vmdev; + int gpadl; + int rc; + + /* Allocate receive buffer */ + buffer->data = umalloc ( buffer->len ); + if ( ! buffer->data ) { + DBGC ( netvsc, "NETVSC %s could not allocate %zd-byte buffer\n", + netvsc->name, buffer->len ); + rc = -ENOMEM; + goto err_alloc; + } + + /* Establish GPA descriptor list */ + gpadl = vmbus_establish_gpadl ( vmdev, buffer->data, buffer->len ); + if ( gpadl < 0 ) { + rc = gpadl; + DBGC ( netvsc, "NETVSC %s could not establish GPADL: %s\n", + netvsc->name, strerror ( rc ) ); + goto err_establish_gpadl; + } + buffer->gpadl = gpadl; + + /* Register transfer page set */ + if ( ( rc = vmbus_register_pages ( vmdev, &buffer->pages ) ) != 0 ) { + DBGC ( netvsc, "NETVSC %s could not register transfer pages: " + "%s\n", netvsc->name, strerror ( rc ) ); + goto err_register_pages; + } + + return 0; + + vmbus_unregister_pages ( vmdev, &buffer->pages ); + err_register_pages: + vmbus_gpadl_teardown ( vmdev, gpadl ); + err_establish_gpadl: + ufree ( buffer->data ); + err_alloc: + return rc; +} + +/** + * Destroy data buffer + * + * @v netvsc NetVSC device + * @v buffer Data buffer + */ +static void netvsc_destroy_buffer ( struct netvsc_device *netvsc, + struct netvsc_buffer *buffer ) { + struct vmbus_device *vmdev = netvsc->vmdev; + int rc; + + /* Unregister transfer pages */ + vmbus_unregister_pages ( vmdev, &buffer->pages ); + + /* Tear down GPA descriptor list */ + if ( ( rc = vmbus_gpadl_teardown ( vmdev, buffer->gpadl ) ) != 0 ) { + DBGC ( netvsc, "NETVSC %s could not tear down GPADL: %s\n", + netvsc->name, strerror ( rc ) ); + /* Death is imminent. The host may well continue to + * write to the data buffer. The best we can do is + * leak memory for now and hope that the host doesn't + * write to this region after we load an OS. + */ + return; + } + + /* Free buffer */ + ufree ( buffer->data ); +} + +/** + * Open device + * + * @v rndis RNDIS device + * @ret rc Return status code + */ +static int netvsc_open ( struct rndis_device *rndis ) { + struct netvsc_device *netvsc = rndis->priv; + int rc; + + /* Initialise receive buffer */ + if ( ( rc = netvsc_create_buffer ( netvsc, &netvsc->rx ) ) != 0 ) + goto err_create_rx; + + /* Open channel */ + if ( ( rc = vmbus_open ( netvsc->vmdev, &netvsc_channel_operations, + PAGE_SIZE, PAGE_SIZE, NETVSC_MTU ) ) != 0 ) { + DBGC ( netvsc, "NETVSC %s could not open VMBus: %s\n", + netvsc->name, strerror ( rc ) ); + goto err_vmbus_open; + } + + /* Initialise communication with NetVSP */ + if ( ( rc = netvsc_initialise ( netvsc ) ) != 0 ) + goto err_initialise; + if ( ( rc = netvsc_ndis_version ( netvsc ) ) != 0 ) + goto err_ndis_version; + + /* Initialise transmit ring */ + if ( ( rc = netvsc_create_ring ( netvsc, &netvsc->tx ) ) != 0 ) + goto err_create_tx; + + /* Establish receive buffer */ + if ( ( rc = netvsc_establish_buffer ( netvsc, &netvsc->rx ) ) != 0 ) + goto err_establish_rx; + + return 0; + + netvsc_revoke_buffer ( netvsc, &netvsc->rx ); + err_establish_rx: + netvsc_destroy_ring ( netvsc, &netvsc->tx, NULL ); + err_create_tx: + err_ndis_version: + err_initialise: + vmbus_close ( netvsc->vmdev ); + err_vmbus_open: + netvsc_destroy_buffer ( netvsc, &netvsc->rx ); + err_create_rx: + return rc; +} + +/** + * Close device + * + * @v rndis RNDIS device + */ +static void netvsc_close ( struct rndis_device *rndis ) { + struct netvsc_device *netvsc = rndis->priv; + + /* Revoke receive buffer */ + netvsc_revoke_buffer ( netvsc, &netvsc->rx ); + + /* Destroy transmit ring */ + netvsc_destroy_ring ( netvsc, &netvsc->tx, netvsc_cancel_transmit ); + + /* Close channel */ + vmbus_close ( netvsc->vmdev ); + + /* Destroy receive buffer */ + netvsc_destroy_buffer ( netvsc, &netvsc->rx ); +} + +/** RNDIS operations */ +static struct rndis_operations netvsc_operations = { + .open = netvsc_open, + .close = netvsc_close, + .transmit = netvsc_transmit, + .poll = netvsc_poll, +}; + +/** + * Probe device + * + * @v vmdev VMBus device + * @ret rc Return status code + */ +static int netvsc_probe ( struct vmbus_device *vmdev ) { + struct netvsc_device *netvsc; + struct rndis_device *rndis; + int rc; + + /* Allocate and initialise structure */ + rndis = alloc_rndis ( sizeof ( *netvsc ) ); + if ( ! rndis ) { + rc = -ENOMEM; + goto err_alloc; + } + rndis_init ( rndis, &netvsc_operations ); + rndis->netdev->dev = &vmdev->dev; + netvsc = rndis->priv; + netvsc->vmdev = vmdev; + netvsc->rndis = rndis; + netvsc->name = vmdev->dev.name; + netvsc_init_ring ( &netvsc->tx, NETVSC_TX_NUM_DESC, + netvsc->tx_iobufs, netvsc->tx_ids ); + netvsc_init_buffer ( &netvsc->rx, NETVSC_RX_BUF_PAGESET, + &netvsc_xfer_pages_operations, + NETVSC_RX_ESTABLISH_MSG, NETVSC_RX_ESTABLISH_XRID, + NETVSC_RX_REVOKE_MSG, NETVSC_RX_REVOKE_XRID, + NETVSC_RX_BUF_LEN ); + vmbus_set_drvdata ( vmdev, rndis ); + + /* Register RNDIS device */ + if ( ( rc = register_rndis ( rndis ) ) != 0 ) { + DBGC ( netvsc, "NETVSC %s could not register: %s\n", + netvsc->name, strerror ( rc ) ); + goto err_register; + } + + return 0; + + unregister_rndis ( rndis ); + err_register: + free_rndis ( rndis ); + err_alloc: + return rc; +} + +/** + * Remove device + * + * @v vmdev VMBus device + */ +static void netvsc_remove ( struct vmbus_device *vmdev ) { + struct rndis_device *rndis = vmbus_get_drvdata ( vmdev ); + + /* Unregister RNDIS device */ + unregister_rndis ( rndis ); + + /* Free RNDIS device */ + free_rndis ( rndis ); +} + +/** NetVSC driver */ +struct vmbus_driver netvsc_driver __vmbus_driver = { + .name = "netvsc", + .type = VMBUS_TYPE ( 0xf8615163, 0xdf3e, 0x46c5, 0x913f, + 0xf2, 0xd2, 0xf9, 0x65, 0xed, 0x0e ), + .probe = netvsc_probe, + .remove = netvsc_remove, +}; |