#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/kauth.h>
#include <kern/zalloc.h>
#include <netinet/in.h>
#include <net/classq/classq.h>
#include <net/classq/if_classq.h>
#include <net/pktsched/pktsched.h>
#include <net/pktsched/pktsched_fq_codel.h>
#include <net/classq/classq_fq_codel.h>
static struct zone *flowq_zone = NULL;
#define FQ_ZONE_MAX (32 * 1024)
#define DTYPE_NODROP 0
#define DTYPE_FORCED 1
#define DTYPE_EARLY 2
void
fq_codel_init(void)
{
if (flowq_zone != NULL)
return;
flowq_zone = zinit(sizeof (struct flowq),
FQ_ZONE_MAX * sizeof (struct flowq), 0, "flowq_zone");
if (flowq_zone == NULL) {
panic("%s: failed to allocate flowq_zone", __func__);
}
zone_change(flowq_zone, Z_EXPAND, TRUE);
zone_change(flowq_zone, Z_CALLERACCT, TRUE);
}
fq_t *
fq_alloc(classq_pkt_type_t ptype)
{
fq_t *fq = NULL;
fq = zalloc(flowq_zone);
if (fq == NULL) {
log(LOG_ERR, "%s: unable to allocate from flowq_zone\n");
return (NULL);
}
bzero(fq, sizeof (*fq));
fq->fq_ptype = ptype;
if (ptype == QP_MBUF) {
MBUFQ_INIT(&fq->fq_mbufq);
}
return (fq);
}
void
fq_destroy(fq_t *fq)
{
VERIFY(fq_empty(fq));
VERIFY(!(fq->fq_flags & (FQF_NEW_FLOW | FQF_OLD_FLOW)));
VERIFY(fq->fq_bytes == 0);
zfree(flowq_zone, fq);
}
static void
fq_detect_dequeue_stall(fq_if_t *fqs, fq_t *flowq, fq_if_classq_t *fq_cl,
u_int64_t *now)
{
u_int64_t maxgetqtime;
if (FQ_IS_DELAYHIGH(flowq) || flowq->fq_getqtime == 0 ||
fq_empty(flowq) ||
flowq->fq_bytes < FQ_MIN_FC_THRESHOLD_BYTES)
return;
maxgetqtime = flowq->fq_getqtime + fqs->fqs_update_interval;
if ((*now) > maxgetqtime) {
FQ_SET_DELAY_HIGH(flowq);
fq_cl->fcl_stat.fcl_dequeue_stall++;
}
}
void
fq_head_drop(fq_if_t *fqs, fq_t *fq)
{
pktsched_pkt_t pkt;
uint32_t *pkt_flags;
uint64_t *pkt_timestamp;
struct ifclassq *ifq = fqs->fqs_ifq;
_PKTSCHED_PKT_INIT(&pkt);
if (fq_getq_flow_internal(fqs, fq, &pkt) == NULL)
return;
pktsched_get_pkt_vars(&pkt, &pkt_flags, &pkt_timestamp, NULL, NULL,
NULL, NULL);
*pkt_timestamp = 0;
if (pkt.pktsched_ptype == QP_MBUF)
*pkt_flags &= ~PKTF_PRIV_GUARDED;
IFCQ_DROP_ADD(ifq, 1, pktsched_get_pkt_len(&pkt));
IFCQ_CONVERT_LOCK(ifq);
pktsched_free_pkt(&pkt);
}
int
fq_addq(fq_if_t *fqs, pktsched_pkt_t *pkt, fq_if_classq_t *fq_cl)
{
int droptype = DTYPE_NODROP, fc_adv = 0, ret = CLASSQEQ_SUCCESS;
u_int64_t now;
fq_t *fq = NULL;
uint64_t *pkt_timestamp;
uint32_t *pkt_flags;
uint32_t pkt_flowid, pkt_tx_start_seq;
uint8_t pkt_proto, pkt_flowsrc;
pktsched_get_pkt_vars(pkt, &pkt_flags, &pkt_timestamp, &pkt_flowid,
&pkt_flowsrc, &pkt_proto, &pkt_tx_start_seq);
if (pkt->pktsched_ptype == QP_MBUF) {
VERIFY(!(*pkt_flags & PKTF_PRIV_GUARDED));
*pkt_flags |= PKTF_PRIV_GUARDED;
}
if (*pkt_timestamp > 0) {
now = *pkt_timestamp;
} else {
struct timespec now_ts;
nanouptime(&now_ts);
now = (now_ts.tv_sec * NSEC_PER_SEC) + now_ts.tv_nsec;
*pkt_timestamp = now;
}
fq = fq_if_hash_pkt(fqs, pkt_flowid, pktsched_get_pkt_svc(pkt),
now, TRUE, pkt->pktsched_ptype);
if (fq == NULL) {
fq_cl->fcl_stat.fcl_drop_memfailure++;
IFCQ_CONVERT_LOCK(fqs->fqs_ifq);
return (CLASSQEQ_DROP);
}
VERIFY(fq->fq_ptype == pkt->pktsched_ptype);
fq_detect_dequeue_stall(fqs, fq, fq_cl, &now);
if (FQ_IS_DELAYHIGH(fq)) {
if ((fq->fq_flags & FQF_FLOWCTL_CAPABLE) &&
(*pkt_flags & PKTF_FLOW_ADV)) {
fc_adv = 1;
if (pkt_proto != IPPROTO_TCP) {
droptype = DTYPE_EARLY;
fq_cl->fcl_stat.fcl_drop_early++;
}
} else {
if (!fq_empty(fq)) {
fq_head_drop(fqs, fq);
droptype = DTYPE_NODROP;
} else {
droptype = DTYPE_EARLY;
}
fq_cl->fcl_stat.fcl_drop_early++;
}
}
if (fc_adv == 1 && droptype != DTYPE_FORCED) {
if (fq_if_add_fcentry(fqs, pkt, pkt_flowid, pkt_flowsrc,
fq_cl)) {
fq->fq_flags |= FQF_FLOWCTL_ON;
if (droptype == DTYPE_NODROP) {
ret = CLASSQEQ_SUCCESS_FC;
} else {
ret = CLASSQEQ_DROP_FC;
}
} else {
droptype = DTYPE_FORCED;
ret = CLASSQEQ_DROP_FC;
fq_cl->fcl_stat.fcl_flow_control_fail++;
}
}
if (droptype == DTYPE_NODROP && fq_if_at_drop_limit(fqs)) {
if (fqs->fqs_large_flow == fq) {
fq_head_drop(fqs, fq);
} else {
if (fqs->fqs_large_flow == NULL) {
droptype = DTYPE_FORCED;
fq_cl->fcl_stat.fcl_drop_overflow++;
ret = CLASSQEQ_DROP;
if (fq_empty(fq) && !(fq->fq_flags &
(FQF_NEW_FLOW | FQF_OLD_FLOW))) {
fq_if_destroy_flow(fqs, fq_cl, fq);
fq = NULL;
}
} else {
fq_if_drop_packet(fqs);
}
}
}
if (droptype == DTYPE_NODROP) {
uint32_t pkt_len = pktsched_get_pkt_len(pkt);
fq_enqueue(fq, pkt->pktsched_pkt);
fq->fq_bytes += pkt_len;
fq_cl->fcl_stat.fcl_byte_cnt += pkt_len;
fq_cl->fcl_stat.fcl_pkt_cnt++;
fq_if_is_flow_heavy(fqs, fq);
} else {
IFCQ_CONVERT_LOCK(fqs->fqs_ifq);
return ((ret != CLASSQEQ_SUCCESS) ? ret : CLASSQEQ_DROP);
}
if ((fq->fq_flags & (FQF_NEW_FLOW|FQF_OLD_FLOW)) == 0) {
VERIFY(STAILQ_NEXT(fq, fq_actlink) == NULL);
STAILQ_INSERT_TAIL(&fq_cl->fcl_new_flows, fq, fq_actlink);
fq->fq_flags |= FQF_NEW_FLOW;
fq_cl->fcl_stat.fcl_newflows_cnt++;
fq->fq_deficit = fq_cl->fcl_quantum;
}
return (ret);
}
void *
fq_getq_flow_internal(fq_if_t *fqs, fq_t *fq, pktsched_pkt_t *pkt)
{
void *p;
uint32_t plen;
fq_if_classq_t *fq_cl;
struct ifclassq *ifq = fqs->fqs_ifq;
fq_dequeue(fq, p);
if (p == NULL)
return (NULL);
pktsched_pkt_encap(pkt, fq->fq_ptype, p);
plen = pktsched_get_pkt_len(pkt);
VERIFY(fq->fq_bytes >= plen);
fq->fq_bytes -= plen;
fq_cl = &fqs->fqs_classq[fq->fq_sc_index];
fq_cl->fcl_stat.fcl_byte_cnt -= plen;
fq_cl->fcl_stat.fcl_pkt_cnt--;
IFCQ_DEC_LEN(ifq);
IFCQ_DEC_BYTES(ifq, plen);
if (fq_empty(fq))
fq->fq_getqtime = 0;
return (p);
}
void *
fq_getq_flow(fq_if_t *fqs, fq_t *fq, pktsched_pkt_t *pkt)
{
void *p;
fq_if_classq_t *fq_cl;
u_int64_t now;
int64_t qdelay = 0;
struct timespec now_ts;
uint32_t *pkt_flags, pkt_tx_start_seq;
uint64_t *pkt_timestamp;
p = fq_getq_flow_internal(fqs, fq, pkt);
if (p == NULL)
return (NULL);
pktsched_get_pkt_vars(pkt, &pkt_flags, &pkt_timestamp, NULL, NULL,
NULL, &pkt_tx_start_seq);
nanouptime(&now_ts);
now = (now_ts.tv_sec * NSEC_PER_SEC) + now_ts.tv_nsec;
if (now > *pkt_timestamp)
qdelay = now - *pkt_timestamp;
fq_cl = &fqs->fqs_classq[fq->fq_sc_index];
if (fq->fq_min_qdelay == 0 ||
(qdelay > 0 && (u_int64_t)qdelay < fq->fq_min_qdelay))
fq->fq_min_qdelay = qdelay;
if (now >= fq->fq_updatetime) {
if (fq->fq_min_qdelay > fqs->fqs_target_qdelay) {
if (!FQ_IS_DELAYHIGH(fq))
FQ_SET_DELAY_HIGH(fq);
} else {
FQ_CLEAR_DELAY_HIGH(fq);
}
fq->fq_updatetime = now + fqs->fqs_update_interval;
fq->fq_min_qdelay = 0;
}
if (!FQ_IS_DELAYHIGH(fq) || fq_empty(fq)) {
FQ_CLEAR_DELAY_HIGH(fq);
if (fq->fq_flags & FQF_FLOWCTL_ON) {
fq_if_flow_feedback(fqs, fq, fq_cl);
}
}
if (fq_empty(fq)) {
fq->fq_getqtime = 0;
} else {
fq->fq_getqtime = now;
}
fq_if_is_flow_heavy(fqs, fq);
*pkt_timestamp = 0;
if (pkt->pktsched_ptype == QP_MBUF)
*pkt_flags &= ~PKTF_PRIV_GUARDED;
return (p);
}