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fsl_etsec: Pad short payloads with zeros 

Depending on QEMU network setup it is possible for us to receive a
complete Ethernet packet that is less 64 bytes long. One such example is
when QEMU is configured to use a standalone TAP device (not set to be a
part of any bridge) receives and ARP packet. In cases like that we need
to add more than just 4-bytes of CRC padding and ensure that our payload
is at least 60 bytes long, such that, when combined with CRC padding
bytes the resulting size is at least 802.3 minimum MTU bytes
long (64). Failing to do that results in code in etsec_walk_rx_ring()
setting BD_RX_SH which, in turn, makes corresponding Linux driver of
emulated host to reject buffer as a runt packet

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Andrey Smirnov 2016-11-28 10:13:14 -08:00 committed by Jason Wang
parent 77d54985b8
commit 64f441d2e5
1 changed files with 8 additions and 0 deletions
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8
hw/net/fsl_etsec/rings.c
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@ -474,6 +474,14 @@ static void rx_init_frame(eTSEC *etsec, const uint8_t *buf, size_t size)
/* CRC padding (We don't have to compute the CRC) */
etsec->rx_padding = 4;
/*
* Ensure that payload length + CRC length is at least 802.3
* minimum MTU size bytes long (64)
*/
if (etsec->rx_buffer_len < 60) {
etsec->rx_padding += 60 - etsec->rx_buffer_len;
}
etsec->rx_first_in_frame = 1;
etsec->rx_remaining_data = etsec->rx_buffer_len;
RING_DEBUG("%s: rx_buffer_len:%u rx_padding+crc:%u\n", __func__,