if_epair: implement fanout
Allow multiple cores to be used to process if_epair traffic. We do this (if RSS is enabled) based on the RSS hash of the incoming packet. This allows us to distribute the load over multiple cores, rather than sending everything to the same one. We also switch from swi_sched() to taskqueues, which also contributes to better throughput. Benchmark results: With net.isr.maxthreads=-1 Setup A: (cc0 - bridge0 - epair0a) (epair0b - bridge1 - cc1) Before 627 Kpps After (no RSS) 1.198 Mpps After (RSS) 3.148 Mpps Setup B: (cc0 - bridge0 - epaira0) (epair0b - vnet jail - epair1a) (epair1b - bridge1 - cc1) Before 7.705 Kpps After (no RSS) 1.017 Mpps After (RSS) 2.083 Mpps MFC after: 3 weeks Sponsored by: Orange Business Services Differential Revision: https://reviews.freebsd.org/D33731
This commit is contained in:
parent
31566b98b8
commit
24f0bfbad5
@ -40,6 +40,8 @@
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_rss.h"
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#include <sys/param.h>
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#include <sys/hash.h>
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#include <sys/jail.h>
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@ -50,10 +52,11 @@ __FBSDID("$FreeBSD$");
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#include <sys/module.h>
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#include <sys/proc.h>
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#include <sys/queue.h>
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#include <sys/sched.h>
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#include <sys/smp.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/sysctl.h>
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#include <sys/taskqueue.h>
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#include <sys/types.h>
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#include <sys/buf_ring.h>
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#include <sys/bus.h>
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@ -68,6 +71,11 @@ __FBSDID("$FreeBSD$");
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#include <net/if_var.h>
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#include <net/if_types.h>
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#include <net/netisr.h>
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#ifdef RSS
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#include <net/rss_config.h>
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#include <netinet/in_rss.h>
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#include <netinet6/in6_rss.h>
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#endif
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#include <net/vnet.h>
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static int epair_clone_match(struct if_clone *, const char *);
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@ -90,21 +98,32 @@ static unsigned int next_index = 0;
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#define EPAIR_LOCK() mtx_lock(&epair_n_index_mtx)
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#define EPAIR_UNLOCK() mtx_unlock(&epair_n_index_mtx)
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static void *swi_cookie[MAXCPU]; /* swi(9). */
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static STAILQ_HEAD(, epair_softc) swi_sc[MAXCPU];
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struct epair_softc;
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struct epair_queue {
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int id;
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struct buf_ring *rxring[2];
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volatile int ridx; /* 0 || 1 */
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struct task tx_task;
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struct epair_softc *sc;
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};
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static struct mtx epair_n_index_mtx;
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struct epair_softc {
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struct ifnet *ifp; /* This ifp. */
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struct ifnet *oifp; /* other ifp of pair. */
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void *swi_cookie; /* swi(9). */
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struct buf_ring *rxring[2];
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volatile int ridx; /* 0 || 1 */
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struct ifmedia media; /* Media config (fake). */
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uint32_t cpuidx;
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struct ifnet *ifp; /* This ifp. */
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struct ifnet *oifp; /* other ifp of pair. */
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int num_queues;
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struct epair_queue *queues;
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struct ifmedia media; /* Media config (fake). */
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STAILQ_ENTRY(epair_softc) entry;
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};
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struct epair_tasks_t {
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int tasks;
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struct taskqueue *tq[MAXCPU];
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};
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static struct epair_tasks_t epair_tasks;
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static void
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epair_clear_mbuf(struct mbuf *m)
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{
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@ -119,61 +138,45 @@ epair_clear_mbuf(struct mbuf *m)
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}
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static void
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epair_if_input(struct epair_softc *sc, int ridx)
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epair_if_input(struct epair_softc *sc, struct epair_queue *q, int ridx)
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{
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struct epoch_tracker et;
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struct ifnet *ifp;
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struct mbuf *m;
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ifp = sc->ifp;
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NET_EPOCH_ENTER(et);
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do {
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m = buf_ring_dequeue_sc(sc->rxring[ridx]);
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CURVNET_SET(ifp->if_vnet);
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while (! buf_ring_empty(q->rxring[ridx])) {
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m = buf_ring_dequeue_mc(q->rxring[ridx]);
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if (m == NULL)
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break;
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continue;
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MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
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(*ifp->if_input)(ifp, m);
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} while (1);
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NET_EPOCH_EXIT(et);
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}
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CURVNET_RESTORE();
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}
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static void
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epair_sintr(struct epair_softc *sc)
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epair_tx_start_deferred(void *arg, int pending)
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{
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struct epair_queue *q = (struct epair_queue *)arg;
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struct epair_softc *sc = q->sc;
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int ridx, nidx;
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if_ref(sc->ifp);
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ridx = atomic_load_int(&q->ridx);
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do {
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ridx = sc->ridx;
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nidx = (ridx == 0) ? 1 : 0;
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} while (!atomic_cmpset_int(&sc->ridx, ridx, nidx));
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epair_if_input(sc, ridx);
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} while (!atomic_fcmpset_int(&q->ridx, &ridx, nidx));
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epair_if_input(sc, q, ridx);
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if (! buf_ring_empty(q->rxring[nidx]))
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taskqueue_enqueue(epair_tasks.tq[q->id], &q->tx_task);
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if_rele(sc->ifp);
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}
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static void
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epair_intr(void *arg)
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{
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struct epair_softc *sc;
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uint32_t cpuidx;
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cpuidx = (uintptr_t)arg;
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/* If this is a problem, this is a read-mostly situation. */
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EPAIR_LOCK();
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STAILQ_FOREACH(sc, &swi_sc[cpuidx], entry) {
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/* Do this lockless. */
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if (buf_ring_empty(sc->rxring[sc->ridx]))
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continue;
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epair_sintr(sc);
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}
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EPAIR_UNLOCK();
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return;
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}
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static int
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epair_menq(struct mbuf *m, struct epair_softc *osc)
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{
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@ -181,7 +184,12 @@ epair_menq(struct mbuf *m, struct epair_softc *osc)
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int len, ret;
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int ridx;
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short mflags;
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struct epair_queue *q = NULL;
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uint32_t bucket;
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bool was_empty;
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#ifdef RSS
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struct ether_header *eh;
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#endif
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/*
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* I know this looks weird. We pass the "other sc" as we need that one
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@ -202,13 +210,38 @@ epair_menq(struct mbuf *m, struct epair_softc *osc)
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MPASS(m->m_nextpkt == NULL);
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MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
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ridx = atomic_load_int(&osc->ridx);
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was_empty = buf_ring_empty(osc->rxring[ridx]);
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ret = buf_ring_enqueue(osc->rxring[ridx], m);
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#ifdef RSS
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ret = rss_m2bucket(m, &bucket);
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if (ret) {
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/* Actually hash the packet. */
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eh = mtod(m, struct ether_header *);
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switch (ntohs(eh->ether_type)) {
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case ETHERTYPE_IP:
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rss_soft_m2cpuid_v4(m, 0, &bucket);
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break;
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case ETHERTYPE_IPV6:
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rss_soft_m2cpuid_v6(m, 0, &bucket);
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break;
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default:
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bucket = 0;
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break;
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}
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}
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bucket %= osc->num_queues;
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#else
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bucket = 0;
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#endif
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q = &osc->queues[bucket];
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ridx = atomic_load_int(&q->ridx);
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was_empty = buf_ring_empty(q->rxring[ridx]);
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ret = buf_ring_enqueue(q->rxring[ridx], m);
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if (ret != 0) {
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/* Ring is full. */
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if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1);
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m_freem(m);
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return (0);
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goto done;
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}
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if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
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@ -223,9 +256,9 @@ epair_menq(struct mbuf *m, struct epair_softc *osc)
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/* Someone else received the packet. */
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if_inc_counter(oifp, IFCOUNTER_IPACKETS, 1);
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/* Kick the interrupt handler for the first packet. */
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if (was_empty && osc->swi_cookie != NULL)
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swi_sched(osc->swi_cookie, 0);
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done:
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if (was_empty)
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taskqueue_enqueue(epair_tasks.tq[bucket], &q->tx_task);
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return (0);
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}
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@ -495,16 +528,27 @@ epair_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
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/* Allocate memory for both [ab] interfaces */
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sca = malloc(sizeof(struct epair_softc), M_EPAIR, M_WAITOK | M_ZERO);
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sca->ifp = if_alloc(IFT_ETHER);
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sca->num_queues = epair_tasks.tasks;
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if (sca->ifp == NULL) {
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free(sca, M_EPAIR);
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ifc_free_unit(ifc, unit);
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return (ENOSPC);
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}
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sca->rxring[0] = buf_ring_alloc(RXRSIZE, M_EPAIR, M_WAITOK,NULL);
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sca->rxring[1] = buf_ring_alloc(RXRSIZE, M_EPAIR, M_WAITOK, NULL);
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sca->queues = mallocarray(sca->num_queues, sizeof(struct epair_queue),
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M_EPAIR, M_WAITOK);
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for (int i = 0; i < sca->num_queues; i++) {
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struct epair_queue *q = &sca->queues[i];
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q->id = i;
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q->rxring[0] = buf_ring_alloc(RXRSIZE, M_EPAIR, M_WAITOK, NULL);
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q->rxring[1] = buf_ring_alloc(RXRSIZE, M_EPAIR, M_WAITOK, NULL);
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q->ridx = 0;
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q->sc = sca;
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NET_TASK_INIT(&q->tx_task, 0, epair_tx_start_deferred, q);
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}
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scb = malloc(sizeof(struct epair_softc), M_EPAIR, M_WAITOK | M_ZERO);
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scb->ifp = if_alloc(IFT_ETHER);
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scb->num_queues = epair_tasks.tasks;
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if (scb->ifp == NULL) {
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free(scb, M_EPAIR);
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if_free(sca->ifp);
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@ -512,8 +556,17 @@ epair_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
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ifc_free_unit(ifc, unit);
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return (ENOSPC);
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}
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scb->rxring[0] = buf_ring_alloc(RXRSIZE, M_EPAIR, M_WAITOK, NULL);
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scb->rxring[1] = buf_ring_alloc(RXRSIZE, M_EPAIR, M_WAITOK, NULL);
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scb->queues = mallocarray(scb->num_queues, sizeof(struct epair_queue),
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M_EPAIR, M_WAITOK);
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for (int i = 0; i < scb->num_queues; i++) {
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struct epair_queue *q = &scb->queues[i];
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q->id = i;
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q->rxring[0] = buf_ring_alloc(RXRSIZE, M_EPAIR, M_WAITOK, NULL);
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q->rxring[1] = buf_ring_alloc(RXRSIZE, M_EPAIR, M_WAITOK, NULL);
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q->ridx = 0;
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q->sc = scb;
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NET_TASK_INIT(&q->tx_task, 0, epair_tx_start_deferred, q);
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}
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/*
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* Cross-reference the interfaces so we will be able to free both.
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@ -528,41 +581,6 @@ epair_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
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#else
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hash = 0;
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#endif
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if (swi_cookie[hash] == NULL) {
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void *cookie;
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EPAIR_UNLOCK();
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error = swi_add(NULL, epairname,
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epair_intr, (void *)(uintptr_t)hash,
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SWI_NET, INTR_MPSAFE, &cookie);
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if (error) {
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buf_ring_free(scb->rxring[0], M_EPAIR);
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buf_ring_free(scb->rxring[1], M_EPAIR);
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if_free(scb->ifp);
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free(scb, M_EPAIR);
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buf_ring_free(sca->rxring[0], M_EPAIR);
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buf_ring_free(sca->rxring[1], M_EPAIR);
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if_free(sca->ifp);
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free(sca, M_EPAIR);
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ifc_free_unit(ifc, unit);
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return (ENOSPC);
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}
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EPAIR_LOCK();
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/* Recheck under lock even though a race is very unlikely. */
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if (swi_cookie[hash] == NULL) {
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swi_cookie[hash] = cookie;
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} else {
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EPAIR_UNLOCK();
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(void) swi_remove(cookie);
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EPAIR_LOCK();
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}
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}
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sca->cpuidx = hash;
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STAILQ_INSERT_TAIL(&swi_sc[hash], sca, entry);
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sca->swi_cookie = swi_cookie[hash];
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scb->cpuidx = hash;
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STAILQ_INSERT_TAIL(&swi_sc[hash], scb, entry);
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scb->swi_cookie = swi_cookie[hash];
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EPAIR_UNLOCK();
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/* Initialise pseudo media types. */
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@ -669,12 +687,15 @@ epair_drain_rings(struct epair_softc *sc)
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struct mbuf *m;
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for (ridx = 0; ridx < 2; ridx++) {
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do {
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m = buf_ring_dequeue_sc(sc->rxring[ridx]);
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if (m == NULL)
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break;
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m_freem(m);
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} while (1);
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for (int i = 0; i < sc->num_queues; i++) {
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struct epair_queue *q = &sc->queues[i];
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do {
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m = buf_ring_dequeue_sc(q->rxring[ridx]);
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if (m == NULL)
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break;
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m_freem(m);
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} while (1);
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}
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}
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}
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@ -707,14 +728,6 @@ epair_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
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ether_ifdetach(ifp);
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ether_ifdetach(oifp);
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/* Second stop interrupt handler. */
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EPAIR_LOCK();
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STAILQ_REMOVE(&swi_sc[sca->cpuidx], sca, epair_softc, entry);
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STAILQ_REMOVE(&swi_sc[scb->cpuidx], scb, epair_softc, entry);
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EPAIR_UNLOCK();
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sca->swi_cookie = NULL;
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scb->swi_cookie = NULL;
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/* Third free any queued packets and all the resources. */
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CURVNET_SET_QUIET(oifp->if_vnet);
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epair_drain_rings(scb);
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@ -725,16 +738,24 @@ epair_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
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__func__, error);
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if_free(oifp);
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ifmedia_removeall(&scb->media);
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buf_ring_free(scb->rxring[0], M_EPAIR);
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buf_ring_free(scb->rxring[1], M_EPAIR);
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for (int i = 0; i < scb->num_queues; i++) {
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struct epair_queue *q = &scb->queues[i];
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buf_ring_free(q->rxring[0], M_EPAIR);
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buf_ring_free(q->rxring[1], M_EPAIR);
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}
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free(scb->queues, M_EPAIR);
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free(scb, M_EPAIR);
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CURVNET_RESTORE();
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epair_drain_rings(sca);
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if_free(ifp);
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ifmedia_removeall(&sca->media);
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buf_ring_free(sca->rxring[0], M_EPAIR);
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buf_ring_free(sca->rxring[1], M_EPAIR);
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for (int i = 0; i < sca->num_queues; i++) {
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struct epair_queue *q = &sca->queues[i];
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buf_ring_free(q->rxring[0], M_EPAIR);
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buf_ring_free(q->rxring[1], M_EPAIR);
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}
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free(sca->queues, M_EPAIR);
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free(sca, M_EPAIR);
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/* Last free the cloner unit. */
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@ -762,34 +783,76 @@ vnet_epair_uninit(const void *unused __unused)
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VNET_SYSUNINIT(vnet_epair_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
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vnet_epair_uninit, NULL);
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static int
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epair_mod_init()
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{
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char name[32];
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epair_tasks.tasks = 0;
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#ifdef RSS
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struct pcpu *pcpu;
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int cpu;
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CPU_FOREACH(cpu) {
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cpuset_t cpu_mask;
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/* Pin to this CPU so we get appropriate NUMA allocations. */
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pcpu = pcpu_find(cpu);
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thread_lock(curthread);
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sched_bind(curthread, cpu);
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thread_unlock(curthread);
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snprintf(name, sizeof(name), "epair_task_%d", cpu);
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epair_tasks.tq[cpu] = taskqueue_create(name, M_WAITOK,
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taskqueue_thread_enqueue,
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&epair_tasks.tq[cpu]);
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CPU_SETOF(cpu, &cpu_mask);
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taskqueue_start_threads_cpuset(&epair_tasks.tq[cpu], 1, PI_NET,
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&cpu_mask, "%s", name);
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||||
epair_tasks.tasks++;
|
||||
}
|
||||
#else
|
||||
snprintf(name, sizeof(name), "epair_task");
|
||||
|
||||
epair_tasks.tq[0] = taskqueue_create(name, M_WAITOK,
|
||||
taskqueue_thread_enqueue,
|
||||
&epair_tasks.tq[0]);
|
||||
taskqueue_start_threads(&epair_tasks.tq[0], 1, PI_NET, "%s", name);
|
||||
|
||||
epair_tasks.tasks = 1;
|
||||
#endif
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
static void
|
||||
epair_mod_cleanup()
|
||||
{
|
||||
|
||||
for (int i = 0; i < epair_tasks.tasks; i++) {
|
||||
taskqueue_drain_all(epair_tasks.tq[i]);
|
||||
taskqueue_free(epair_tasks.tq[i]);
|
||||
}
|
||||
}
|
||||
|
||||
static int
|
||||
epair_modevent(module_t mod, int type, void *data)
|
||||
{
|
||||
int i;
|
||||
int ret;
|
||||
|
||||
switch (type) {
|
||||
case MOD_LOAD:
|
||||
for (i = 0; i < MAXCPU; i++) {
|
||||
swi_cookie[i] = NULL;
|
||||
STAILQ_INIT(&swi_sc[i]);
|
||||
}
|
||||
EPAIR_LOCK_INIT();
|
||||
ret = epair_mod_init();
|
||||
if (ret != 0)
|
||||
return (ret);
|
||||
if (bootverbose)
|
||||
printf("%s: %s initialized.\n", __func__, epairname);
|
||||
break;
|
||||
case MOD_UNLOAD:
|
||||
EPAIR_LOCK();
|
||||
for (i = 0; i < MAXCPU; i++) {
|
||||
if (!STAILQ_EMPTY(&swi_sc[i])) {
|
||||
printf("%s: swi_sc[%d] active\n", __func__, i);
|
||||
EPAIR_UNLOCK();
|
||||
return (EBUSY);
|
||||
}
|
||||
}
|
||||
EPAIR_UNLOCK();
|
||||
for (i = 0; i < MAXCPU; i++)
|
||||
if (swi_cookie[i] != NULL)
|
||||
(void) swi_remove(swi_cookie[i]);
|
||||
epair_mod_cleanup();
|
||||
EPAIR_LOCK_DESTROY();
|
||||
if (bootverbose)
|
||||
printf("%s: %s unloaded.\n", __func__, epairname);
|
||||
|
Loading…
Reference in New Issue
Block a user