Minor fixups + add locking.
o change time to MPSAFE callout o make debug printfs conditional on DUMMYNET_DEBUG and runtime controllable by net.inet.ip.dummynet.debug o make boot-time printf dependent on bootverbose Sponsored by: FreeBSD Foundation
This commit is contained in:
Sam Leffler
parent
e636fe824a
commit
91176902bc
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=120140
@ -27,8 +27,7 @@
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* $FreeBSD$
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*/
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#define DEB(x)
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#define DDB(x) x
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#define DUMMYNET_DEBUG
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/*
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* This module implements IP dummynet, a bandwidth limiter/delay emulator
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@ -123,7 +122,7 @@ static void ready_event(struct dn_flow_queue *q);
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static struct dn_pipe *all_pipes = NULL ; /* list of all pipes */
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static struct dn_flow_set *all_flow_sets = NULL ;/* list of all flow_sets */
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static struct callout_handle dn_timeout;
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static struct callout dn_timeout;
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#ifdef SYSCTL_NODE
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SYSCTL_NODE(_net_inet_ip, OID_AUTO, dummynet,
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@ -153,6 +152,31 @@ SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, red_max_pkt_size,
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CTLFLAG_RD, &red_max_pkt_size, 0, "RED Max packet size");
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#endif
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#define DUMMYNET_DEBUG
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#ifdef DUMMYNET_DEBUG
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int dummynet_debug = 0;
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#ifdef SYSCTL_NODE
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SYSCTL_INT(_net_inet_ip_dummynet, OID_AUTO, debug, CTLFLAG_RW, &dummynet_debug,
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0, "control debugging printfs");
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#endif
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#define DPRINTF(X) if (dummynet_debug) printf X
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#else
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#define DPRINTF(X)
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#endif
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static struct mtx dummynet_mtx;
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/*
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* NB: Recursion is needed to deal with re-entry via ICMP. That is,
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* a packet may be dispatched via ip_input from dummynet_io and
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* re-enter through ip_output. Yech.
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*/
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#define DUMMYNET_LOCK_INIT() \
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mtx_init(&dummynet_mtx, "dummynet", NULL, MTX_DEF | MTX_RECURSE)
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#define DUMMYNET_LOCK_DESTROY() mtx_destroy(&dummynet_mtx)
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#define DUMMYNET_LOCK() mtx_lock(&dummynet_mtx)
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#define DUMMYNET_UNLOCK() mtx_unlock(&dummynet_mtx)
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#define DUMMYNET_LOCK_ASSERT() mtx_assert(&dummynet_mtx, MA_OWNED)
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static int config_pipe(struct dn_pipe *p);
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static int ip_dn_ctl(struct sockopt *sopt);
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@ -201,14 +225,14 @@ heap_init(struct dn_heap *h, int new_size)
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struct dn_heap_entry *p;
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if (h->size >= new_size ) {
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printf("dummynet: heap_init, Bogus call, have %d want %d\n",
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printf("dummynet: %s, Bogus call, have %d want %d\n", __func__,
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h->size, new_size);
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return 0 ;
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}
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new_size = (new_size + HEAP_INCREMENT ) & ~HEAP_INCREMENT ;
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p = malloc(new_size * sizeof(*p), M_DUMMYNET, M_NOWAIT);
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if (p == NULL) {
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printf("dummynet: heap_init, resize %d failed\n", new_size );
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printf("dummynet: %s, resize %d failed\n", __func__, new_size );
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return 1 ; /* error */
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}
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if (h->size > 0) {
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@ -434,6 +458,7 @@ transmit_event(struct dn_pipe *pipe)
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case DN_TO_BDG_FWD :
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if (!BDG_LOADED) {
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/* somebody unloaded the bridge module. Drop pkt */
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/* XXX rate limit */
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printf("dummynet: dropping bridged packet trapped in pipe\n");
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m_freem(pkt->dn_m);
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break;
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@ -525,6 +550,8 @@ ready_event(struct dn_flow_queue *q)
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struct dn_pipe *p = q->fs->pipe ;
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int p_was_empty ;
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DUMMYNET_LOCK_ASSERT();
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if (p == NULL) {
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printf("dummynet: ready_event- pipe is gone\n");
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return ;
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@ -589,14 +616,16 @@ ready_event_wfq(struct dn_pipe *p)
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struct dn_heap *sch = &(p->scheduler_heap);
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struct dn_heap *neh = &(p->not_eligible_heap) ;
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DUMMYNET_LOCK_ASSERT();
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if (p->if_name[0] == 0) /* tx clock is simulated */
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p->numbytes += ( curr_time - p->sched_time ) * p->bandwidth;
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else { /* tx clock is for real, the ifq must be empty or this is a NOP */
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if (p->ifp && p->ifp->if_snd.ifq_head != NULL)
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return ;
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else {
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DEB(printf("dummynet: pipe %d ready from %s --\n",
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p->pipe_nr, p->if_name);)
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DPRINTF(("dummynet: pipe %d ready from %s --\n",
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p->pipe_nr, p->if_name));
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}
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}
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@ -705,7 +734,6 @@ dummynet(void * __unused unused)
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{
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void *p ; /* generic parameter to handler */
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struct dn_heap *h ;
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int s ;
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struct dn_heap *heaps[3];
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int i;
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struct dn_pipe *pe ;
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@ -713,14 +741,15 @@ dummynet(void * __unused unused)
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heaps[0] = &ready_heap ; /* fixed-rate queues */
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heaps[1] = &wfq_ready_heap ; /* wfq queues */
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heaps[2] = &extract_heap ; /* delay line */
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s = splimp(); /* see note on top, splnet() is not enough */
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DUMMYNET_LOCK();
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curr_time++ ;
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for (i=0; i < 3 ; i++) {
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h = heaps[i];
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while (h->elements > 0 && DN_KEY_LEQ(h->p[0].key, curr_time) ) {
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DDB(if (h->p[0].key > curr_time)
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if (h->p[0].key > curr_time)
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printf("dummynet: warning, heap %d is %d ticks late\n",
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i, (int)(curr_time - h->p[0].key));)
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i, (int)(curr_time - h->p[0].key));
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p = h->p[0].object ; /* store a copy before heap_extract */
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heap_extract(h, NULL); /* need to extract before processing */
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if (i == 0)
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@ -746,8 +775,9 @@ dummynet(void * __unused unused)
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q->S = q->F + 1 ; /* mark timestamp as invalid */
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pe->sum -= q->fs->weight ;
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}
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splx(s);
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dn_timeout = timeout(dummynet, NULL, 1);
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DUMMYNET_UNLOCK();
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callout_reset(&dn_timeout, 1, dummynet, NULL);
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}
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/*
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@ -758,6 +788,7 @@ if_tx_rdy(struct ifnet *ifp)
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{
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struct dn_pipe *p;
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DUMMYNET_LOCK();
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for (p = all_pipes; p ; p = p->next )
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if (p->ifp == ifp)
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break ;
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@ -767,16 +798,18 @@ if_tx_rdy(struct ifnet *ifp)
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for (p = all_pipes; p ; p = p->next )
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if (!strcmp(p->if_name, buf) ) {
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p->ifp = ifp ;
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DEB(printf("dummynet: ++ tx rdy from %s (now found)\n", buf);)
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DPRINTF(("dummynet: ++ tx rdy from %s (now found)\n", buf));
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break ;
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}
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}
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if (p != NULL) {
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DEB(printf("dummynet: ++ tx rdy from %s%d - qlen %d\n", ifp->if_name,
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ifp->if_unit, ifp->if_snd.ifq_len);)
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DPRINTF(("dummynet: ++ tx rdy from %s%d - qlen %d\n", ifp->if_name,
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ifp->if_unit, ifp->if_snd.ifq_len));
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p->numbytes = 0 ; /* mark ready for I/O */
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ready_event_wfq(p);
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}
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DUMMYNET_UNLOCK();
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return 0;
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}
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@ -937,7 +970,7 @@ red_drops(struct dn_flow_set *fs, struct dn_flow_queue *q, int len)
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/* queue in bytes or packets ? */
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u_int q_size = (fs->flags_fs & DN_QSIZE_IS_BYTES) ? q->len_bytes : q->len;
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DEB(printf("\ndummynet: %d q: %2u ", (int) curr_time, q_size);)
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DPRINTF(("\ndummynet: %d q: %2u ", (int) curr_time, q_size));
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/* average queue size estimation */
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if (q_size != 0) {
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@ -963,7 +996,7 @@ red_drops(struct dn_flow_set *fs, struct dn_flow_queue *q, int len)
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SCALE_MUL(q->avg, fs->w_q_lookup[t]) : 0;
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}
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}
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DEB(printf("dummynet: avg: %u ", SCALE_VAL(q->avg));)
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DPRINTF(("dummynet: avg: %u ", SCALE_VAL(q->avg)));
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/* should i drop ? */
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@ -982,7 +1015,7 @@ red_drops(struct dn_flow_set *fs, struct dn_flow_queue *q, int len)
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p_b = SCALE_MUL((int64_t) fs->c_3, (int64_t) q->avg) - fs->c_4;
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} else {
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q->count = -1;
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DEB(printf("dummynet: - drop"););
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DPRINTF(("dummynet: - drop"));
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return 1 ;
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}
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} else if (q->avg > fs->min_th) {
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@ -1004,7 +1037,7 @@ red_drops(struct dn_flow_set *fs, struct dn_flow_queue *q, int len)
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*/
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if (SCALE_MUL(p_b, SCALE((int64_t) q->count)) > q->random) {
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q->count = 0;
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DEB(printf("dummynet: - red drop");)
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DPRINTF(("dummynet: - red drop"));
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/* after a drop we calculate a new random value */
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q->random = random() & 0xffff;
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return 1; /* drop */
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@ -1086,7 +1119,6 @@ dummynet_io(struct mbuf *m, int pipe_nr, int dir, struct ip_fw_args *fwa)
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struct dn_pipe *pipe ;
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u_int64_t len = m->m_pkthdr.len ;
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struct dn_flow_queue *q = NULL ;
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int s = splimp();
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int is_pipe;
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#if IPFW2
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ipfw_insn *cmd = fwa->rule->cmd + fwa->rule->act_ofs;
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@ -1100,6 +1132,7 @@ dummynet_io(struct mbuf *m, int pipe_nr, int dir, struct ip_fw_args *fwa)
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pipe_nr &= 0xffff ;
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DUMMYNET_LOCK();
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/*
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* This is a dummynet rule, so we expect an O_PIPE or O_QUEUE rule.
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*/
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@ -1240,21 +1273,21 @@ dummynet_io(struct mbuf *m, int pipe_nr, int dir, struct ip_fw_args *fwa)
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if (pipe->numbytes >= 0) { /* pipe is idle */
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if (pipe->scheduler_heap.elements != 1)
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printf("dummynet: OUCH! pipe should have been idle!\n");
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DEB(printf("dummynet: waking up pipe %d at %d\n",
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pipe->pipe_nr, (int)(q->F >> MY_M)); )
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DPRINTF(("dummynet: waking up pipe %d at %d\n",
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pipe->pipe_nr, (int)(q->F >> MY_M)));
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pipe->sched_time = curr_time ;
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ready_event_wfq(pipe);
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}
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}
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}
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done:
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splx(s);
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DUMMYNET_UNLOCK();
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return 0;
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dropit:
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splx(s);
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if (q)
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q->drops++ ;
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DUMMYNET_UNLOCK();
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m_freem(m);
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return ( (fs && (fs->flags_fs & DN_NOERROR)) ? 0 : ENOBUFS);
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}
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@ -1283,6 +1316,8 @@ purge_flow_set(struct dn_flow_set *fs, int all)
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struct dn_flow_queue *q, *qn ;
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int i ;
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DUMMYNET_LOCK_ASSERT();
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for (i = 0 ; i <= fs->rq_size ; i++ ) {
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for (q = fs->rq[i] ; q ; q = qn ) {
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for (pkt = q->head ; pkt ; )
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@ -1334,10 +1369,8 @@ dummynet_flush()
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{
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struct dn_pipe *curr_p, *p ;
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struct dn_flow_set *fs, *curr_fs;
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int s ;
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s = splimp() ;
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DUMMYNET_LOCK();
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/* remove all references to pipes ...*/
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flush_pipe_ptrs(NULL);
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/* prevent future matches... */
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@ -1349,7 +1382,8 @@ dummynet_flush()
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heap_free(&ready_heap);
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heap_free(&wfq_ready_heap);
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heap_free(&extract_heap);
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splx(s) ;
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DUMMYNET_UNLOCK();
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/*
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* Now purge all queued pkts and delete all pipes
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*/
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@ -1393,6 +1427,7 @@ dn_rule_delete(void *r)
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struct dn_pkt *pkt ;
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struct dn_flow_set *fs ;
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DUMMYNET_LOCK();
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/*
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* If the rule references a queue (dn_flow_set), then scan
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* the flow set, otherwise scan pipes. Should do either, but doing
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@ -1407,6 +1442,7 @@ dn_rule_delete(void *r)
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if (pkt->rule == r)
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pkt->rule = ip_fw_default_rule ;
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}
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DUMMYNET_UNLOCK();
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}
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/*
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@ -1516,7 +1552,7 @@ set_fs_parms(struct dn_flow_set *x, struct dn_flow_set *src)
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static int
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config_pipe(struct dn_pipe *p)
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{
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int i, r, s;
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int i, r;
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struct dn_flow_set *pfs = &(p->fs);
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struct dn_flow_queue *q;
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@ -1534,6 +1570,8 @@ config_pipe(struct dn_pipe *p)
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return EINVAL ;
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if (p->pipe_nr != 0) { /* this is a pipe */
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struct dn_pipe *x, *a, *b;
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DUMMYNET_LOCK();
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/* locate pipe */
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for (a = NULL , b = all_pipes ; b && b->pipe_nr < p->pipe_nr ;
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a = b , b = b->next) ;
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@ -1552,15 +1590,12 @@ config_pipe(struct dn_pipe *p)
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x->idle_heap.offset=OFFSET_OF(struct dn_flow_queue, heap_pos);
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} else {
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x = b;
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s = splimp();
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/* Flush accumulated credit for all queues */
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for (i = 0; i <= x->fs.rq_size; i++)
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for (q = x->fs.rq[i]; q; q = q->next)
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q->numbytes = 0;
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splx(s);
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}
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s = splimp();
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x->bandwidth = p->bandwidth ;
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x->numbytes = 0; /* just in case... */
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bcopy(p->if_name, x->if_name, sizeof(p->if_name) );
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@ -1572,8 +1607,8 @@ config_pipe(struct dn_pipe *p)
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if ( x->fs.rq == NULL ) { /* a new pipe */
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r = alloc_hash(&(x->fs), pfs) ;
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if (r) {
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DUMMYNET_UNLOCK();
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free(x, M_DUMMYNET);
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splx(s);
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return r ;
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}
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x->next = b ;
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@ -1582,10 +1617,11 @@ config_pipe(struct dn_pipe *p)
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else
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a->next = x ;
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}
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splx(s);
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DUMMYNET_UNLOCK();
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} else { /* config queue */
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struct dn_flow_set *x, *a, *b ;
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DUMMYNET_LOCK();
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/* locate flow_set */
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for (a=NULL, b=all_flow_sets ; b && b->fs_nr < pfs->fs_nr ;
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a = b , b = b->next) ;
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@ -1595,6 +1631,7 @@ config_pipe(struct dn_pipe *p)
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return EINVAL ;
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x = malloc(sizeof(struct dn_flow_set), M_DUMMYNET, M_NOWAIT|M_ZERO);
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if (x == NULL) {
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DUMMYNET_UNLOCK();
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printf("dummynet: no memory for new flow_set\n");
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return ENOSPC;
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}
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@ -1611,14 +1648,13 @@ config_pipe(struct dn_pipe *p)
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return EINVAL ;
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x = b;
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}
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s = splimp();
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set_fs_parms(x, pfs);
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if ( x->rq == NULL ) { /* a new flow_set */
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r = alloc_hash(x, pfs) ;
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if (r) {
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DUMMYNET_UNLOCK();
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free(x, M_DUMMYNET);
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splx(s);
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return r ;
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}
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x->next = b;
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@ -1627,7 +1663,7 @@ config_pipe(struct dn_pipe *p)
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else
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a->next = x;
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}
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splx(s);
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DUMMYNET_UNLOCK();
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}
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return 0 ;
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}
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@ -1680,6 +1716,8 @@ dummynet_drain()
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struct dn_pipe *p;
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struct dn_pkt *pkt;
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DUMMYNET_LOCK_ASSERT();
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heap_free(&ready_heap);
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heap_free(&wfq_ready_heap);
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heap_free(&extract_heap);
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@ -1701,8 +1739,6 @@ dummynet_drain()
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static int
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delete_pipe(struct dn_pipe *p)
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{
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int s ;
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if (p->pipe_nr == 0 && p->fs.fs_nr == 0)
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return EINVAL ;
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if (p->pipe_nr != 0 && p->fs.fs_nr != 0)
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@ -1711,13 +1747,14 @@ delete_pipe(struct dn_pipe *p)
|
||||
struct dn_pipe *a, *b;
|
||||
struct dn_flow_set *fs;
|
||||
|
||||
DUMMYNET_LOCK();
|
||||
/* locate pipe */
|
||||
for (a = NULL , b = all_pipes ; b && b->pipe_nr < p->pipe_nr ;
|
||||
a = b , b = b->next) ;
|
||||
if (b == NULL || (b->pipe_nr != p->pipe_nr) )
|
||||
if (b == NULL || (b->pipe_nr != p->pipe_nr) ) {
|
||||
DUMMYNET_UNLOCK();
|
||||
return EINVAL ; /* not found */
|
||||
|
||||
s = splimp() ;
|
||||
}
|
||||
|
||||
/* unlink from list of pipes */
|
||||
if (a == NULL)
|
||||
@ -1740,18 +1777,21 @@ delete_pipe(struct dn_pipe *p)
|
||||
/* remove reference to here from extract_heap and wfq_ready_heap */
|
||||
pipe_remove_from_heap(&extract_heap, b);
|
||||
pipe_remove_from_heap(&wfq_ready_heap, b);
|
||||
splx(s);
|
||||
DUMMYNET_UNLOCK();
|
||||
|
||||
free(b, M_DUMMYNET);
|
||||
} else { /* this is a WF2Q queue (dn_flow_set) */
|
||||
struct dn_flow_set *a, *b;
|
||||
|
||||
DUMMYNET_LOCK();
|
||||
/* locate set */
|
||||
for (a = NULL, b = all_flow_sets ; b && b->fs_nr < p->fs.fs_nr ;
|
||||
a = b , b = b->next) ;
|
||||
if (b == NULL || (b->fs_nr != p->fs.fs_nr) )
|
||||
if (b == NULL || (b->fs_nr != p->fs.fs_nr) ) {
|
||||
DUMMYNET_UNLOCK();
|
||||
return EINVAL ; /* not found */
|
||||
}
|
||||
|
||||
s = splimp() ;
|
||||
if (a == NULL)
|
||||
all_flow_sets = b->next ;
|
||||
else
|
||||
@ -1769,7 +1809,7 @@ delete_pipe(struct dn_pipe *p)
|
||||
#endif
|
||||
}
|
||||
purge_flow_set(b, 1);
|
||||
splx(s);
|
||||
DUMMYNET_UNLOCK();
|
||||
}
|
||||
return 0 ;
|
||||
}
|
||||
@ -1783,6 +1823,8 @@ dn_copy_set(struct dn_flow_set *set, char *bp)
|
||||
int i, copied = 0 ;
|
||||
struct dn_flow_queue *q, *qp = (struct dn_flow_queue *)bp;
|
||||
|
||||
DUMMYNET_LOCK_ASSERT();
|
||||
|
||||
for (i = 0 ; i <= set->rq_size ; i++)
|
||||
for (q = set->rq[i] ; q ; q = q->next, qp++ ) {
|
||||
if (q->hash_slot != i)
|
||||
@ -1811,9 +1853,10 @@ dummynet_get(struct sockopt *sopt)
|
||||
size_t size ;
|
||||
struct dn_flow_set *set ;
|
||||
struct dn_pipe *p ;
|
||||
int s, error=0 ;
|
||||
int error=0 ;
|
||||
|
||||
s = splimp();
|
||||
/* XXX lock held too long */
|
||||
DUMMYNET_LOCK();
|
||||
/*
|
||||
* compute size of data structures: list of pipes and flow_sets.
|
||||
*/
|
||||
@ -1825,7 +1868,7 @@ dummynet_get(struct sockopt *sopt)
|
||||
set->rq_elements * sizeof(struct dn_flow_queue);
|
||||
buf = malloc(size, M_TEMP, M_NOWAIT);
|
||||
if (buf == 0) {
|
||||
splx(s);
|
||||
DUMMYNET_UNLOCK();
|
||||
return ENOBUFS ;
|
||||
}
|
||||
for (p = all_pipes, bp = buf ; p ; p = p->next ) {
|
||||
@ -1864,7 +1907,8 @@ dummynet_get(struct sockopt *sopt)
|
||||
bp += sizeof( *set ) ;
|
||||
bp = dn_copy_set( set, bp );
|
||||
}
|
||||
splx(s);
|
||||
DUMMYNET_UNLOCK();
|
||||
|
||||
error = sooptcopyout(sopt, buf, size);
|
||||
free(buf, M_TEMP);
|
||||
return error ;
|
||||
@ -1927,7 +1971,11 @@ ip_dn_ctl(struct sockopt *sopt)
|
||||
static void
|
||||
ip_dn_init(void)
|
||||
{
|
||||
printf("DUMMYNET initialized (011031)\n");
|
||||
if (bootverbose)
|
||||
printf("DUMMYNET initialized (011031)\n");
|
||||
|
||||
DUMMYNET_LOCK_INIT();
|
||||
|
||||
all_pipes = NULL ;
|
||||
all_flow_sets = NULL ;
|
||||
ready_heap.size = ready_heap.elements = 0 ;
|
||||
@ -1938,27 +1986,40 @@ ip_dn_init(void)
|
||||
|
||||
extract_heap.size = extract_heap.elements = 0 ;
|
||||
extract_heap.offset = 0 ;
|
||||
|
||||
ip_dn_ctl_ptr = ip_dn_ctl;
|
||||
ip_dn_io_ptr = dummynet_io;
|
||||
ip_dn_ruledel_ptr = dn_rule_delete;
|
||||
bzero(&dn_timeout, sizeof(struct callout_handle));
|
||||
dn_timeout = timeout(dummynet, NULL, 1);
|
||||
|
||||
callout_init(&dn_timeout, CALLOUT_MPSAFE);
|
||||
callout_reset(&dn_timeout, 1, dummynet, NULL);
|
||||
}
|
||||
|
||||
#ifdef KLD_MODULE
|
||||
static void
|
||||
ip_dn_destroy(void)
|
||||
{
|
||||
ip_dn_ctl_ptr = NULL;
|
||||
ip_dn_io_ptr = NULL;
|
||||
ip_dn_ruledel_ptr = NULL;
|
||||
|
||||
callout_stop(&dn_timeout);
|
||||
dummynet_flush();
|
||||
|
||||
DUMMYNET_LOCK_DESTROY();
|
||||
}
|
||||
#endif /* KLD_MODULE */
|
||||
|
||||
static int
|
||||
dummynet_modevent(module_t mod, int type, void *data)
|
||||
{
|
||||
int s;
|
||||
switch (type) {
|
||||
case MOD_LOAD:
|
||||
s = splimp();
|
||||
if (DUMMYNET_LOADED) {
|
||||
splx(s);
|
||||
printf("DUMMYNET already loaded\n");
|
||||
return EEXIST ;
|
||||
}
|
||||
ip_dn_init();
|
||||
splx(s);
|
||||
break;
|
||||
|
||||
case MOD_UNLOAD:
|
||||
@ -1966,13 +2027,7 @@ dummynet_modevent(module_t mod, int type, void *data)
|
||||
printf("dummynet statically compiled, cannot unload\n");
|
||||
return EINVAL ;
|
||||
#else
|
||||
s = splimp();
|
||||
untimeout(dummynet, NULL, dn_timeout);
|
||||
dummynet_flush();
|
||||
ip_dn_ctl_ptr = NULL;
|
||||
ip_dn_io_ptr = NULL;
|
||||
ip_dn_ruledel_ptr = NULL;
|
||||
splx(s);
|
||||
ip_dn_destroy();
|
||||
#endif
|
||||
break ;
|
||||
default:
|
||||
|
||||
Loading…
Reference in New Issue
Block a user