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api: net: fix length check in eth_receive()

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If the requested length is too small to hold the received packet,
eth_receive() will return -1 and will leave the packet in the receive
buffers. Instead of returning an error in this case, we return the first
portion of the received packet and remove it from the receive buffers.

This fixes FreeBSD's ubldr. Without this patch it will just stop receiving
packets if the NIC receives more than PKTBUFSRX too large packets.

Signed-off-by: Michael Walle <michael@walle.cc>
Cc: Joe Hershberger <joe.hershberger@gmail.com>
Cc: Rafal Jaworowski <raj@semihalf.com>
Cc: Piotr Kruszynski <ppk@semihalf.com>
This commit is contained in:
Michael Walle 2012-06-22 11:24:28 +00:00 committed by Joe Hershberger
parent 7f51898c1b
commit 46c07bcf12
1 changed files with 1 additions and 4 deletions
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5
net/eth.c
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@ -500,10 +500,7 @@ int eth_receive(void *packet, int length)
return -1;
}
if (length < eth_rcv_bufs[eth_rcv_current].length)
return -1;
length = eth_rcv_bufs[eth_rcv_current].length;
length = min(eth_rcv_bufs[eth_rcv_current].length, length);
for (i = 0; i < length; i++)
p[i] = eth_rcv_bufs[eth_rcv_current].data[i];