shithub: riscv

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ref: 2273121e1cfe765f30467bdab842cae8b0d88cd3
parent: f1a32c955360268a7bc901de057e6e451c979853
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Fri Jul 14 20:48:52 EDT 2023

etherimx: ignore trailing 4 byte garbage in ethernet receive packet

There are 4 trailing bytes (fcs?) in the received packet,
which is a problem for devbridge when forwarding
the frame to another interface as it makes it oversized.

--- a/sys/src/9/imx8/etherimx.c

+++ b/sys/src/9/imx8/etherimx.c

@@ -435,7 +435,7 @@

 		}

 		if(((s^RD_L) & (RD_L|RD_ERR)) == 0){

 			b = ctlr->rx->b[i];

-			b->wp = b->rp + (s & RD_LEN);

+			b->wp = b->rp + (s & RD_LEN) - 4;

 			dmaflush(0, b->rp, BLEN(b));

 			etheriq(edev, b);