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eepro100: Support RNR interrupt 

The RNR interrupt is triggered under these conditions:

* the RU is not ready to receive a frame due to missing resources
* the RU is ready and a RU abort command was requested

Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Stefan Weil 2010-03-02 22:37:53 +01:00 committed by Michael S. Tsirkin
parent e715c8e84c
commit e824012bc2
1 changed files with 10 additions and 3 deletions
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13
hw/eepro100.c
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@ -120,7 +120,7 @@
#define RU_NOP 0x0000
#define RX_START 0x0001
#define RX_RESUME 0x0002
#define RX_ABORT 0x0004
#define RU_ABORT 0x0004
#define RX_ADDR_LOAD 0x0006
#define RX_RESUMENR 0x0007
#define INT_MASK 0x0100
@ -426,13 +426,11 @@ static void eepro100_fr_interrupt(EEPRO100State * s)
eepro100_interrupt(s, 0x40);
}
#if 0
static void eepro100_rnr_interrupt(EEPRO100State * s)
{
/* RU is not ready. */
eepro100_interrupt(s, 0x10);
}
#endif
static void eepro100_mdi_interrupt(EEPRO100State * s)
{
@ -1065,6 +1063,13 @@ static void eepro100_ru_command(EEPRO100State * s, uint8_t val)
}
set_ru_state(s, ru_ready);
break;
case RU_ABORT:
/* RU abort. */
if (get_ru_state(s) == ru_ready) {
eepro100_rnr_interrupt(s);
}
set_ru_state(s, ru_idle);
break;
case RX_ADDR_LOAD:
/* Load RU base. */
TRACE(OTHER, logout("val=0x%02x (RU base address)\n", val));
@ -1747,6 +1752,8 @@ static ssize_t nic_receive(VLANClientState *nc, const uint8_t * buf, size_t size
if (get_ru_state(s) != ru_ready) {
/* No resources available. */
logout("no resources, state=%u\n", get_ru_state(s));
/* TODO: RNR interrupt only at first failed frame? */
eepro100_rnr_interrupt(s);
s->statistics.rx_resource_errors++;
//~ assert(!"no resources");
return -1;