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m_copyback() doesn't work the way I expexted it: it doesn't update the 

mbuf fields, and it seems it doesn't allocate mbuf clusters for large
packets. So revert to using MCLGET() if needed and memcpy to get the
data in the mbuf.
Should fix panic in m_makewritable() reported by Mike M. Volokhov
and Andreas Wrede on port-xen, patch tested by Andreas Wrede.
This commit is contained in:
bouyer 2006-03-16 23:02:50 +00:00
parent c6b6c1a57b
commit 62b855014e
1 changed files with 16 additions and 11 deletions
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19
sys/arch/xen/xen/if_xennet.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: if_xennet.c,v 1.43 2006/03/06 22:04:18 bouyer Exp $ */
/* $NetBSD: if_xennet.c,v 1.44 2006/03/16 23:02:50 bouyer Exp $ */
/*
*
@ -33,7 +33,7 @@
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_xennet.c,v 1.43 2006/03/06 22:04:18 bouyer Exp $");
__KERNEL_RCSID(0, "$NetBSD: if_xennet.c,v 1.44 2006/03/16 23:02:50 bouyer Exp $");
#include "opt_inet.h"
#include "opt_nfs_boot.h"
@ -787,18 +787,23 @@ xen_network_handler(void *arg)
* memory, copy data and push the receive
* buffer back to the hypervisor.
*/
m->m_len = MHLEN;
m->m_pkthdr.len = 0;
m_copyback(m, 0, rx->status, pktp);
xennet_rx_push_buffer(sc, rx->id);
if (m->m_pkthdr.len < rx->status) {
if (rx->status > MHLEN) {
MCLGET(m, M_DONTWAIT);
if (__predict_false(
(m->m_flags & M_EXT) == 0)) {
/* out of memory, just drop packets */
ifp->if_ierrors++;
m_freem(m);
xennet_rx_push_buffer(sc, rx->id);
continue;
}
}
m->m_len = m->m_pkthdr.len = rx->status;
memcpy(mtod(m, void *), pktp, rx->status);
xennet_rx_push_buffer(sc, rx->id);
}
#ifdef XENNET_DEBUG_DUMP
xennet_hex_dump(mtod(m, u_char *), m->m_pkthdr.len, "r", rx->id);
#endif