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pcnet: Do not receive external frames in loopback mode 

While not explicitly stated in the spec, it was observed on real systems
that enabling loopback testing on the pcnet controller disables
reception of external frames. And some legacy software relies on it, so
provide this behavior.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jan Kiszka 2010-10-19 17:03:24 +02:00 committed by Anthony Liguori
parent 2871a3f6b6
commit c1ded3dc9f
1 changed files with 3 additions and 2 deletions
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5
hw/pcnet.c
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@ -1048,9 +1048,10 @@ ssize_t pcnet_receive(VLANClientState *nc, const uint8_t *buf, size_t size_)
int crc_err = 0;
int size = size_;
if (CSR_DRX(s) || CSR_STOP(s) || CSR_SPND(s) || !size)
if (CSR_DRX(s) || CSR_STOP(s) || CSR_SPND(s) || !size ||
(CSR_LOOP(s) && !s->looptest)) {
return -1;
}
#ifdef PCNET_DEBUG
printf("pcnet_receive size=%d\n", size);
#endif