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efi_loader: use events for efi_net_receive

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A timer event is defined. The timer handler cares for receiving new
packets.

efi_timer_check is called both in efi_net_transmit and efi_net_receive
to enable events during network communication.

Calling efi_timer_check in efi_net_get_status is implemented in a
separate patch.

[agraf] This patch is needed to make efi_net_get_status() actually
        report incoming packets.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
[agraf: fix spelling in comment]
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Heinrich Schuchardt 2017-10-05 16:36:00 +02:00 committed by Alexander Graf
parent 61da678c39
commit a0549ef607
1 changed files with 50 additions and 3 deletions
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53
lib/efi_loader/efi_net.c
View file

@ -19,6 +19,11 @@ 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;
struct efi_net_obj {
/* Generic EFI object parent class data */
@ -143,6 +148,8 @@ static efi_status_t EFIAPI efi_net_transmit(struct efi_simple_network *this,
EFI_ENTRY("%p, %lx, %lx, %p, %p, %p, %p", this, header_size,
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);
@ -174,9 +181,7 @@ static efi_status_t EFIAPI efi_net_receive(struct efi_simple_network *this,
EFI_ENTRY("%p, %p, %p, %p, %p, %p, %p", this, header_size,
buffer_size, buffer, src_addr, dest_addr, protocol);
push_packet = efi_net_push;
eth_rx();
push_packet = NULL;
efi_timer_check();
if (!new_rx_packet)
return EFI_EXIT(EFI_NOT_READY);
@ -204,10 +209,32 @@ void efi_net_set_dhcp_ack(void *pkt, int len)
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(). */
int 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 */
@ -253,5 +280,25 @@ int efi_net_register(void)
/* Hook net up to the device list */
list_add_tail(&netobj->parent.link, &efi_obj_list);
/*
* Create a timer event.
*
* The notification function is used to check if a new network packet
* has been received.
*/
r = efi_create_event(EVT_TIMER | EVT_NOTIFY_SIGNAL, TPL_CALLBACK,
efi_network_timer_notify, 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 0;
}