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Add the MBUF_FRAG_TEST option. When compiled in, this option

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allows you to tell ip_output to fragment all outgoing packets
into mbuf fragments of size net.inet.ip.mbuf_frag_size bytes.
This is an excellent way to test if network drivers can properly
handle long mbuf chains being passed to them.

net.inet.ip.mbuf_frag_size defaults to 0 (no fragmentation)
so that you can at least boot before your network driver dies. :)
This commit is contained in:
Mike Silbersack 2003-03-25 05:45:05 +00:00
parent 94c35e0af2
commit 9d9edc5693
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=112591
2 changed files with 31 additions and 0 deletions
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1
sys/conf/options
View File

@ -360,6 +360,7 @@ SLIP_IFF_OPTS opt_slip.h
TCPDEBUG
TCP_DROP_SYNFIN opt_tcp_input.h
XBONEHACK
MBUF_FRAG_TEST opt_mbuf_frag_test.h
# Netgraph(4). Use option NETGRAPH to enable the base netgraph code.
# Each netgraph node type can be either be compiled into the kernel

30
sys/netinet/ip_output.c
View File

@ -42,6 +42,7 @@
#include "opt_mac.h"
#include "opt_pfil_hooks.h"
#include "opt_random_ip_id.h"
#include "opt_mbuf_frag_test.h"
#include <sys/param.h>
#include <sys/systm.h>
@ -52,6 +53,7 @@
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/route.h>
@ -94,6 +96,12 @@ static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "internet multicast options");
u_short ip_id;
#ifdef MBUF_FRAG_TEST
int mbuf_frag_size = 0;
SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
&mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
#endif
static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *);
static struct ifnet *ip_multicast_if(struct in_addr *, int *);
static void ip_mloopback
@ -1012,6 +1020,28 @@ ip_output(m0, opt, ro, flags, imo, inp)
ipsec_delaux(m);
#endif
#ifdef MBUF_FRAG_TEST
if (mbuf_frag_size) {
struct mbuf *m1, *m2;
int length;
length = m->m_len;
while (1) {
length -= mbuf_frag_size;
if (length < 1)
break;
m1 = m_split(m, length, M_DONTWAIT);
m2 = m;
while (1) {
if (m2->m_next == NULL)
break;
m2 = m2->m_next;
}
m2->m_next = m1;
}
}
#endif
error = (*ifp->if_output)(ifp, m,
(struct sockaddr *)dst, ro->ro_rt);
goto done;