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Implement queue-limiting based on bandwidth.

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Approved by:	jkh
This commit is contained in:
Poul-Henning Kamp 2000-02-26 18:28:24 +00:00
parent 6f35016f23
commit 90a822243f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=57519
1 changed files with 31 additions and 6 deletions
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37
sys/pci/if_mn.c
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@ -55,6 +55,7 @@ struct mn_control {
#include <sys/conf.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/sockio.h>
@ -68,6 +69,14 @@ struct mn_control {
#include <netgraph/ng_sample.h>
#include <netgraph/netgraph.h>
static int mn_maxlatency = 1000;
SYSCTL_INT(_debug, OID_AUTO, mn_maxlatency, CTLFLAG_RW,
&mn_maxlatency, 0,
"The number of milliseconds a packet is allowed to spend in the output queue. "
"If the output queue is longer than this number of milliseconds when the packet "
"arrives for output, the packet will be dropped."
);
#ifndef NMN
/* Most machines don't support more than 4 busmaster PCI slots, if even that many */
#define NMN 4
@ -175,7 +184,7 @@ static int mn_reset(struct softc *sc);
static struct trxd * mn_alloc_desc(void);
static void mn_free_desc(struct trxd *dp);
static void mn_intr(void *xsc);
static u_int32_t mn_parse_ts(const char *s);
static u_int32_t mn_parse_ts(const char *s, int *nbit);
#ifdef notyet
static void m32_dump(struct softc *sc);
static void f54_dump(struct softc *sc);
@ -237,6 +246,9 @@ struct schan {
int last_error;
int prev_error;
u_long tx_pending;
u_long tx_limit;
};
static struct softc {
@ -380,21 +392,23 @@ ngmn_newhook(node_p node, hook_p hook, const char *name)
{
u_int32_t ts, chan;
struct softc *sc;
int nbit;
sc = node->private;
if (name[0] != 't' || name[1] != 's')
return (EINVAL);
ts = mn_parse_ts(name + 2);
ts = mn_parse_ts(name + 2, &nbit);
if (ts == 0)
return (EINVAL);
chan = ffs(ts) - 1;
if (sc->ch[chan])
return (EBUSY);
mn_create_channel(sc, chan); /* Create the first channel */
mn_create_channel(sc, chan);
sc->ch[chan]->ts = ts;
sc->ch[chan]->hook = hook;
sc->ch[chan]->tx_limit = nbit * 8;
hook->private = sc->ch[chan];
return(0);
}
@ -423,7 +437,7 @@ mn_free_desc(struct trxd *dp)
}
static u_int32_t
mn_parse_ts(const char *s)
mn_parse_ts(const char *s, int *nbit)
{
unsigned r;
int i, j;
@ -431,15 +445,18 @@ mn_parse_ts(const char *s)
r = 0;
j = 0;
*nbit = 0;
while(*s) {
i = strtol(s, &p, 0);
if (i < 1 || i > 31)
return (0);
while (j && j < i) {
r |= 1 << j++;
(*nbit)++;
}
j = 0;
r |= 1 << i;
(*nbit)++;
if (*p == ',') {
s = p + 1;
continue;
@ -500,7 +517,11 @@ ngmn_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
sc = sch->sc;
chan = sch->chan;
if (sc->ch[chan]->state != UP) {
if (sch->state != UP) {
NG_FREE_DATA(m, meta);
return (0);
}
if (sch->tx_pending + m->m_pkthdr.len > sch->tx_limit * mn_maxlatency) {
NG_FREE_DATA(m, meta);
return (0);
}
@ -545,6 +566,8 @@ ngmn_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
if (pitch)
printf("%s%d: Short on mem, pitched %d packets\n",
sc->name, chan, pitch);
else
sch->tx_pending += m->m_pkthdr.len;
return (0);
}
@ -982,8 +1005,10 @@ mn_tx_intr(struct softc *sc, u_int32_t vector)
if (vtophys(dp) == sc->m32_mem.ctxd[chan])
return;
m = dp->m;
if (m)
if (m) {
sc->ch[chan]->tx_pending -= m->m_pkthdr.len;
m_freem(m);
}
sc->ch[chan]->last_xmit = time_second;
sc->ch[chan]->x1 = dp->vnext;
mn_free_desc(dp);