u-boot/lib/efi_loader/efi_net.c
Heinrich Schuchardt ee3db4fc04 efi_loader: use TPL_NOTIFY for network timer event
We use a timer to poll the network.

iPXE is used for booting from iSCSI drives. It has been changed to run at
TPL_CALLBACK most of the time (which is not what the UEFI spec
recommends).

By changing our timer to TPL_NOTIFY we can ensure that it is nevertheless
executed.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
2018-04-04 11:03:37 +02:00

377 lines
10 KiB
C

/*
* EFI application network access support
*
* Copyright (c) 2016 Alexander Graf
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <efi_loader.h>
#include <inttypes.h>
#include <lcd.h>
#include <malloc.h>
DECLARE_GLOBAL_DATA_PTR;
static const efi_guid_t efi_net_guid = EFI_SIMPLE_NETWORK_GUID;
static const efi_guid_t efi_pxe_guid = EFI_PXE_GUID;
static struct efi_pxe_packet *dhcp_ack;
static bool new_rx_packet;
static void *new_tx_packet;
/*
* The notification function of this event is called in every timer cycle
* to check if a new network packet has been received.
*/
static struct efi_event *network_timer_event;
/*
* This event is signaled when a packet has been received.
*/
static struct efi_event *wait_for_packet;
struct efi_net_obj {
/* Generic EFI object parent class data */
struct efi_object parent;
/* EFI Interface callback struct for network */
struct efi_simple_network net;
struct efi_simple_network_mode net_mode;
/* PXE struct to transmit dhcp data */
struct efi_pxe pxe;
struct efi_pxe_mode pxe_mode;
};
static efi_status_t EFIAPI efi_net_start(struct efi_simple_network *this)
{
EFI_ENTRY("%p", this);
return EFI_EXIT(EFI_SUCCESS);
}
static efi_status_t EFIAPI efi_net_stop(struct efi_simple_network *this)
{
EFI_ENTRY("%p", this);
return EFI_EXIT(EFI_SUCCESS);
}
static efi_status_t EFIAPI efi_net_initialize(struct efi_simple_network *this,
ulong extra_rx, ulong extra_tx)
{
EFI_ENTRY("%p, %lx, %lx", this, extra_rx, extra_tx);
eth_init();
return EFI_EXIT(EFI_SUCCESS);
}
static efi_status_t EFIAPI efi_net_reset(struct efi_simple_network *this,
int extended_verification)
{
EFI_ENTRY("%p, %x", this, extended_verification);
return EFI_EXIT(EFI_SUCCESS);
}
static efi_status_t EFIAPI efi_net_shutdown(struct efi_simple_network *this)
{
EFI_ENTRY("%p", this);
return EFI_EXIT(EFI_SUCCESS);
}
static efi_status_t EFIAPI efi_net_receive_filters(
struct efi_simple_network *this, u32 enable, u32 disable,
int reset_mcast_filter, ulong mcast_filter_count,
struct efi_mac_address *mcast_filter)
{
EFI_ENTRY("%p, %x, %x, %x, %lx, %p", this, enable, disable,
reset_mcast_filter, mcast_filter_count, mcast_filter);
return EFI_EXIT(EFI_UNSUPPORTED);
}
static efi_status_t EFIAPI efi_net_station_address(
struct efi_simple_network *this, int reset,
struct efi_mac_address *new_mac)
{
EFI_ENTRY("%p, %x, %p", this, reset, new_mac);
return EFI_EXIT(EFI_UNSUPPORTED);
}
static efi_status_t EFIAPI efi_net_statistics(struct efi_simple_network *this,
int reset, ulong *stat_size,
void *stat_table)
{
EFI_ENTRY("%p, %x, %p, %p", this, reset, stat_size, stat_table);
return EFI_EXIT(EFI_UNSUPPORTED);
}
static efi_status_t EFIAPI efi_net_mcastiptomac(struct efi_simple_network *this,
int ipv6,
struct efi_ip_address *ip,
struct efi_mac_address *mac)
{
EFI_ENTRY("%p, %x, %p, %p", this, ipv6, ip, mac);
return EFI_EXIT(EFI_INVALID_PARAMETER);
}
static efi_status_t EFIAPI efi_net_nvdata(struct efi_simple_network *this,
int read_write, ulong offset,
ulong buffer_size, char *buffer)
{
EFI_ENTRY("%p, %x, %lx, %lx, %p", this, read_write, offset, buffer_size,
buffer);
return EFI_EXIT(EFI_UNSUPPORTED);
}
static efi_status_t EFIAPI efi_net_get_status(struct efi_simple_network *this,
u32 *int_status, void **txbuf)
{
EFI_ENTRY("%p, %p, %p", this, int_status, txbuf);
efi_timer_check();
if (int_status) {
/* We send packets synchronously, so nothing is outstanding */
*int_status = EFI_SIMPLE_NETWORK_TRANSMIT_INTERRUPT;
if (new_rx_packet)
*int_status |= EFI_SIMPLE_NETWORK_RECEIVE_INTERRUPT;
}
if (txbuf)
*txbuf = new_tx_packet;
new_tx_packet = NULL;
return EFI_EXIT(EFI_SUCCESS);
}
static efi_status_t EFIAPI efi_net_transmit(struct efi_simple_network *this,
size_t header_size, size_t buffer_size, void *buffer,
struct efi_mac_address *src_addr,
struct efi_mac_address *dest_addr, u16 *protocol)
{
EFI_ENTRY("%p, %lu, %lu, %p, %p, %p, %p", this,
(unsigned long)header_size, (unsigned long)buffer_size,
buffer, src_addr, dest_addr, protocol);
efi_timer_check();
if (header_size) {
/* We would need to create the header if header_size != 0 */
return EFI_EXIT(EFI_INVALID_PARAMETER);
}
#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
/* Ethernet packets always fit, just bounce */
memcpy(efi_bounce_buffer, buffer, buffer_size);
net_send_packet(efi_bounce_buffer, buffer_size);
#else
net_send_packet(buffer, buffer_size);
#endif
new_tx_packet = buffer;
return EFI_EXIT(EFI_SUCCESS);
}
static void efi_net_push(void *pkt, int len)
{
new_rx_packet = true;
wait_for_packet->is_signaled = true;
}
/*
* Receive a packet from a network interface.
*
* This function implements the Receive service of the Simple Network Protocol.
* See the UEFI spec for details.
*
* @this the instance of the Simple Network Protocol
* @header_size size of the media header
* @buffer_size size of the buffer to receive the packet
* @buffer buffer to receive the packet
* @src_addr source MAC address
* @dest_addr destination MAC address
* @protocol protocol
* @return status code
*/
static efi_status_t EFIAPI efi_net_receive(struct efi_simple_network *this,
size_t *header_size, size_t *buffer_size, void *buffer,
struct efi_mac_address *src_addr,
struct efi_mac_address *dest_addr, u16 *protocol)
{
struct ethernet_hdr *eth_hdr;
size_t hdr_size = sizeof(struct ethernet_hdr);
u16 protlen;
EFI_ENTRY("%p, %p, %p, %p, %p, %p, %p", this, header_size,
buffer_size, buffer, src_addr, dest_addr, protocol);
efi_timer_check();
if (!new_rx_packet)
return EFI_EXIT(EFI_NOT_READY);
/* Check that we at least received an Ethernet header */
if (net_rx_packet_len < sizeof(struct ethernet_hdr)) {
new_rx_packet = false;
return EFI_EXIT(EFI_NOT_READY);
}
/* Fill export parameters */
eth_hdr = (struct ethernet_hdr *)net_rx_packet;
protlen = ntohs(eth_hdr->et_protlen);
if (protlen == 0x8100) {
hdr_size += 4;
protlen = ntohs(*(u16 *)&net_rx_packet[hdr_size - 2]);
}
if (header_size)
*header_size = hdr_size;
if (dest_addr)
memcpy(dest_addr, eth_hdr->et_dest, ARP_HLEN);
if (src_addr)
memcpy(src_addr, eth_hdr->et_src, ARP_HLEN);
if (protocol)
*protocol = protlen;
if (*buffer_size < net_rx_packet_len) {
/* Packet doesn't fit, try again with bigger buf */
*buffer_size = net_rx_packet_len;
return EFI_EXIT(EFI_BUFFER_TOO_SMALL);
}
/* Copy packet */
memcpy(buffer, net_rx_packet, net_rx_packet_len);
*buffer_size = net_rx_packet_len;
new_rx_packet = false;
return EFI_EXIT(EFI_SUCCESS);
}
void efi_net_set_dhcp_ack(void *pkt, int len)
{
int maxsize = sizeof(*dhcp_ack);
if (!dhcp_ack)
dhcp_ack = malloc(maxsize);
memcpy(dhcp_ack, pkt, min(len, maxsize));
}
/*
* Check if a new network packet has been received.
*
* This notification function is called in every timer cycle.
*
* @event the event for which this notification function is registered
* @context event context - not used in this function
*/
static void EFIAPI efi_network_timer_notify(struct efi_event *event,
void *context)
{
EFI_ENTRY("%p, %p", event, context);
if (!new_rx_packet) {
push_packet = efi_net_push;
eth_rx();
push_packet = NULL;
}
EFI_EXIT(EFI_SUCCESS);
}
/* This gets called from do_bootefi_exec(). */
efi_status_t efi_net_register(void)
{
struct efi_net_obj *netobj;
efi_status_t r;
if (!eth_get_dev()) {
/* No eth device active, don't expose any */
return EFI_SUCCESS;
}
/* We only expose the "active" eth device, so one is enough */
netobj = calloc(1, sizeof(*netobj));
if (!netobj) {
printf("ERROR: Out of memory\n");
return EFI_OUT_OF_RESOURCES;
}
/* Hook net up to the device list */
efi_add_handle(&netobj->parent);
/* Fill in object data */
r = efi_add_protocol(netobj->parent.handle, &efi_net_guid,
&netobj->net);
if (r != EFI_SUCCESS)
goto failure_to_add_protocol;
r = efi_add_protocol(netobj->parent.handle, &efi_guid_device_path,
efi_dp_from_eth());
if (r != EFI_SUCCESS)
goto failure_to_add_protocol;
r = efi_add_protocol(netobj->parent.handle, &efi_pxe_guid,
&netobj->pxe);
if (r != EFI_SUCCESS)
goto failure_to_add_protocol;
netobj->net.revision = EFI_SIMPLE_NETWORK_PROTOCOL_REVISION;
netobj->net.start = efi_net_start;
netobj->net.stop = efi_net_stop;
netobj->net.initialize = efi_net_initialize;
netobj->net.reset = efi_net_reset;
netobj->net.shutdown = efi_net_shutdown;
netobj->net.receive_filters = efi_net_receive_filters;
netobj->net.station_address = efi_net_station_address;
netobj->net.statistics = efi_net_statistics;
netobj->net.mcastiptomac = efi_net_mcastiptomac;
netobj->net.nvdata = efi_net_nvdata;
netobj->net.get_status = efi_net_get_status;
netobj->net.transmit = efi_net_transmit;
netobj->net.receive = efi_net_receive;
netobj->net.mode = &netobj->net_mode;
netobj->net_mode.state = EFI_NETWORK_STARTED;
memcpy(netobj->net_mode.current_address.mac_addr, eth_get_ethaddr(), 6);
netobj->net_mode.hwaddr_size = ARP_HLEN;
netobj->net_mode.max_packet_size = PKTSIZE;
netobj->pxe.mode = &netobj->pxe_mode;
if (dhcp_ack)
netobj->pxe_mode.dhcp_ack = *dhcp_ack;
/*
* Create WaitForPacket event.
*/
r = efi_create_event(EVT_NOTIFY_WAIT, TPL_CALLBACK,
efi_network_timer_notify, NULL, NULL,
&wait_for_packet);
if (r != EFI_SUCCESS) {
printf("ERROR: Failed to register network event\n");
return r;
}
netobj->net.wait_for_packet = wait_for_packet;
/*
* Create a timer event.
*
* The notification function is used to check if a new network packet
* has been received.
*
* iPXE is running at TPL_CALLBACK most of the time. Use a higher TPL.
*/
r = efi_create_event(EVT_TIMER | EVT_NOTIFY_SIGNAL, TPL_NOTIFY,
efi_network_timer_notify, NULL, NULL,
&network_timer_event);
if (r != EFI_SUCCESS) {
printf("ERROR: Failed to register network event\n");
return r;
}
/* Network is time critical, create event in every timer cyle */
r = efi_set_timer(network_timer_event, EFI_TIMER_PERIODIC, 0);
if (r != EFI_SUCCESS) {
printf("ERROR: Failed to set network timer\n");
return r;
}
return EFI_SUCCESS;
failure_to_add_protocol:
printf("ERROR: Failure to add protocol\n");
return r;
}