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FCS check and padding for minimum size Ethernet packet

This commit is contained in:
billc 2001-10-20 08:19:47 +00:00
parent 51e607ae23
commit 0b357f290a
1 changed files with 28 additions and 3 deletions
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31
sys/dev/ofw/ofnet.c
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@ -1,4 +1,4 @@
/* $NetBSD: ofnet.c,v 1.21 2001/08/26 02:49:18 matt Exp $ */
/* $NetBSD: ofnet.c,v 1.22 2001/10/20 08:19:47 billc Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
@ -192,7 +192,7 @@ ofnet_read(struct ofnet_softc *of)
continue;
}
bufp = buf;
/* Allocate a header mbuf */
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == 0) {
@ -201,6 +201,19 @@ ofnet_read(struct ofnet_softc *of)
}
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = len;
/*
* We don't know if the interface included the FCS
* or not. For now, assume that it did if we got
* a packet length that looks like it could include
* the FCS.
*
* XXX Yuck.
*/
if (len > (ETHER_MAX_LEN - ETHER_CRC_LEN))
m->m_flags |= M_HASFCS;
l = MHLEN;
head = 0;
mp = &head;
@ -335,7 +348,19 @@ ofnet_start(struct ifnet *ifp)
bufp += m->m_len;
MFREE(m, m0);
}
if (OF_write(of->sc_ihandle, buf, bufp - buf) != bufp - buf)
/*
* We don't know if the interface will auto-pad for
* us, so make sure it's at least as large as a
* minimum size Ethernet packet.
*/
if (len < (ETHER_MIN_LEN - ETHER_CRC_LEN))
len = ETHER_MIN_LEN - ETHER_CRC_LEN;
else
len = bufp - buf;
if (OF_write(of->sc_ihandle, buf, len) != len)
ifp->if_oerrors++;
else
ifp->if_opackets++;