Adds an experimental option to create a pool of

threads. These serve as input threads and are queued
packets based on the V-tag number. This is similar to
what a modern card can do with queue's for TCP... but
alas modern cards know nothing about SCTP.

MFC after:	3 months (maybe)

sys/conf/options

@@ -439,6 +439,7 @@ SCTP_PACKET_LOGGING	opt_sctp.h # Log to a packet buffer last N packets
 SCTP_LTRACE_CHUNKS	opt_sctp.h # Log to KTR chunks processed
 SCTP_LTRACE_ERRORS	opt_sctp.h # Log to KTR error returns.
 SCTP_USE_PERCPU_STAT    opt_sctp.h # Use per cpu stats.
+SCTP_MCORE_INPUT        opt_sctp.h # Have multiple input threads for input mbufs
 #
 #
 #

sys/netinet/sctp_bsd_addr.c

@@ -68,6 +68,7 @@ MALLOC_DEFINE(SCTP_M_TIMW, "sctp_timw", "sctp time block");
 MALLOC_DEFINE(SCTP_M_MVRF, "sctp_mvrf", "sctp mvrf pcb list");
 MALLOC_DEFINE(SCTP_M_ITER, "sctp_iter", "sctp iterator control");
 MALLOC_DEFINE(SCTP_M_SOCKOPT, "sctp_socko", "sctp socket option");
+MALLOC_DEFINE(SCTP_M_MCORE, "sctp_mcore", "sctp mcore queue");
 
 /* Global NON-VNET structure that controls the iterator */
 struct iterator_control sctp_it_ctl;

sys/netinet/sctp_constants.h

@@ -91,6 +91,8 @@ __FBSDID("$FreeBSD$");
 #define SCTP_KTRHEAD_NAME "sctp_iterator"
 #define SCTP_KTHREAD_PAGES 0
 
+#define SCTP_MCORE_NAME "sctp_core_worker"
+
 
 /* If you support Multi-VRF how big to
  * make the initial array of VRF's to.

sys/netinet/sctp_input.c

@@ -48,6 +48,7 @@ __FBSDID("$FreeBSD$");
 #include <netinet/sctp_timer.h>
 #include <netinet/sctp_crc32.h>
 #include <netinet/udp.h>
+#include <sys/smp.h>
 
 
 
@@ -5921,10 +5922,32 @@ bad:
 	}
 	return;
 }
+
+
 void
-sctp_input(i_pak, off)
-	struct mbuf *i_pak;
-	int off;
+sctp_input(struct mbuf *m, int off)
 {
-	sctp_input_with_port(i_pak, off, 0);
+#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
+	struct ip *ip;
+	struct sctphdr *sh;
+	int offset;
+	int cpu_to_use;
+
+	if (mp_ncpus > 1) {
+		ip = mtod(m, struct ip *);
+		offset = off + sizeof(*sh);
+		if (SCTP_BUF_LEN(m) < offset) {
+			if ((m = m_pullup(m, offset)) == 0) {
+				SCTP_STAT_INCR(sctps_hdrops);
+				return;
+			}
+			ip = mtod(m, struct ip *);
+		}
+		sh = (struct sctphdr *)((caddr_t)ip + off);
+		cpu_to_use = ntohl(sh->v_tag) % mp_ncpus;
+		sctp_queue_to_mcore(m, off, cpu_to_use);
+		return;
+	}
+#endif
+	sctp_input_with_port(m, off, 0);
 }

sys/netinet/sctp_lock_bsd.h

@@ -97,6 +97,48 @@ extern int sctp_logoff_stuff;
              rw_rlock(&SCTP_BASE_INFO(ipi_ep_mtx));                         \
 } while (0)
 
+#define SCTP_MCORE_QLOCK_INIT(cpstr) do { \
+		mtx_init(&(cpstr)->que_mtx,	      \
+			 "sctp-mcore_queue","queue_lock",	\
+			 MTX_DEF|MTX_DUPOK);		\
+} while (0)
+
+#define SCTP_MCORE_QLOCK(cpstr)  do { \
+		mtx_lock(&(cpstr)->que_mtx);	\
+} while (0)
+
+#define SCTP_MCORE_QUNLOCK(cpstr)  do { \
+		mtx_unlock(&(cpstr)->que_mtx);	\
+} while (0)
+
+#define SCTP_MCORE_QDESTROY(cpstr)  do { \
+	if(mtx_owned(&(cpstr)->core_mtx)) {	\
+		mtx_unlock(&(cpstr)->que_mtx);	\
+        } \
+	mtx_destroy(&(cpstr)->que_mtx);	\
+} while (0)
+
+
+#define SCTP_MCORE_LOCK_INIT(cpstr) do { \
+		mtx_init(&(cpstr)->core_mtx,	      \
+			 "sctp-cpulck","cpu_proc_lock",	\
+			 MTX_DEF|MTX_DUPOK);		\
+} while (0)
+
+#define SCTP_MCORE_LOCK(cpstr)  do { \
+		mtx_lock(&(cpstr)->core_mtx);	\
+} while (0)
+
+#define SCTP_MCORE_UNLOCK(cpstr)  do { \
+		mtx_unlock(&(cpstr)->core_mtx);	\
+} while (0)
+
+#define SCTP_MCORE_DESTROY(cpstr)  do { \
+	if(mtx_owned(&(cpstr)->core_mtx)) {	\
+		mtx_unlock(&(cpstr)->core_mtx);	\
+        } \
+	mtx_destroy(&(cpstr)->core_mtx);	\
+} while (0)
 
 #define SCTP_INP_INFO_WLOCK()	do { 					\
             rw_wlock(&SCTP_BASE_INFO(ipi_ep_mtx));                         \

sys/netinet/sctp_os_bsd.h

@@ -123,6 +123,7 @@ MALLOC_DECLARE(SCTP_M_TIMW);
 MALLOC_DECLARE(SCTP_M_MVRF);
 MALLOC_DECLARE(SCTP_M_ITER);
 MALLOC_DECLARE(SCTP_M_SOCKOPT);
+MALLOC_DECLARE(SCTP_M_MCORE);
 
 #if defined(SCTP_LOCAL_TRACE_BUF)
 

sys/netinet/sctp_pcb.c

@@ -47,6 +47,9 @@ __FBSDID("$FreeBSD$");
 #include <netinet/sctp_bsd_addr.h>
 #include <netinet/sctp_dtrace_define.h>
 #include <netinet/udp.h>
+#include <sys/sched.h>
+#include <sys/smp.h>
+#include <sys/unistd.h>
 
 
 VNET_DEFINE(struct sctp_base_info, system_base_info);
@@ -5435,6 +5438,148 @@ sctp_del_local_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
 static int sctp_max_number_of_assoc = SCTP_MAX_NUM_OF_ASOC;
 static int sctp_scale_up_for_address = SCTP_SCALE_FOR_ADDR;
 
+
+
+#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
+struct sctp_mcore_ctrl *sctp_mcore_workers = NULL;
+
+void
+sctp_queue_to_mcore(struct mbuf *m, int off, int cpu_to_use)
+{
+	/* Queue a packet to a processor for the specified core */
+	struct sctp_mcore_queue *qent;
+	struct sctp_mcore_ctrl *wkq;
+	int need_wake = 0;
+
+	if (sctp_mcore_workers == NULL) {
+		/* Something went way bad during setup */
+		sctp_input_with_port(m, off, 0);
+		return;
+	}
+	SCTP_MALLOC(qent, struct sctp_mcore_queue *,
+	    (sizeof(struct sctp_mcore_queue)),
+	    SCTP_M_MCORE);
+	if (qent == NULL) {
+		/* This is trouble  */
+		sctp_input_with_port(m, off, 0);
+		return;
+	}
+	qent->vn = curvnet;
+	qent->m = m;
+	qent->off = off;
+	qent->v6 = 0;
+	wkq = &sctp_mcore_workers[cpu_to_use];
+	SCTP_MCORE_QLOCK(wkq);
+
+	TAILQ_INSERT_TAIL(&wkq->que, qent, next);
+	if (wkq->running == 0) {
+		need_wake = 1;
+	}
+	SCTP_MCORE_QUNLOCK(wkq);
+	if (need_wake) {
+		wakeup(&wkq->running);
+	}
+}
+
+static void
+sctp_mcore_thread(void *arg)
+{
+
+	struct sctp_mcore_ctrl *wkq;
+	struct sctp_mcore_queue *qent;
+
+	wkq = (struct sctp_mcore_ctrl *)arg;
+	struct mbuf *m;
+	int off, v6;
+
+	/* Wait for first tickle */
+	SCTP_MCORE_LOCK(wkq);
+	wkq->running = 0;
+	msleep(&wkq->running,
+	    &wkq->core_mtx,
+	    0, "wait for pkt", 0);
+	SCTP_MCORE_UNLOCK(wkq);
+
+	/* Bind to our cpu */
+	thread_lock(curthread);
+	sched_bind(curthread, wkq->cpuid);
+	thread_unlock(curthread);
+
+	/* Now lets start working */
+	SCTP_MCORE_LOCK(wkq);
+	/* Now grab lock and go */
+	while (1) {
+		SCTP_MCORE_QLOCK(wkq);
+skip_sleep:
+		wkq->running = 1;
+		qent = TAILQ_FIRST(&wkq->que);
+		if (qent) {
+			TAILQ_REMOVE(&wkq->que, qent, next);
+			SCTP_MCORE_QUNLOCK(wkq);
+			CURVNET_SET(qent->vn);
+			m = qent->m;
+			off = qent->off;
+			v6 = qent->v6;
+			SCTP_FREE(qent, SCTP_M_MCORE);
+			if (v6 == 0) {
+				sctp_input_with_port(m, off, 0);
+			} else {
+				printf("V6 not yet supported\n");
+				sctp_m_freem(m);
+			}
+			CURVNET_RESTORE();
+			SCTP_MCORE_QLOCK(wkq);
+		}
+		wkq->running = 0;
+		if (!TAILQ_EMPTY(&wkq->que)) {
+			goto skip_sleep;
+		}
+		SCTP_MCORE_QUNLOCK(wkq);
+		msleep(&wkq->running,
+		    &wkq->core_mtx,
+		    0, "wait for pkt", 0);
+	};
+}
+
+static void
+sctp_startup_mcore_threads(void)
+{
+	int i;
+
+	if (mp_ncpus == 1)
+		return;
+
+	SCTP_MALLOC(sctp_mcore_workers, struct sctp_mcore_ctrl *,
+	    (mp_ncpus * sizeof(struct sctp_mcore_ctrl)),
+	    SCTP_M_MCORE);
+	if (sctp_mcore_workers == NULL) {
+		/* TSNH I hope */
+		return;
+	}
+	memset(sctp_mcore_workers, 0, (mp_ncpus *
+	    sizeof(struct sctp_mcore_ctrl)));
+	/* Init the structures */
+	for (i = 0; i < mp_ncpus; i++) {
+		TAILQ_INIT(&sctp_mcore_workers[i].que);
+		SCTP_MCORE_LOCK_INIT(&sctp_mcore_workers[i]);
+		SCTP_MCORE_QLOCK_INIT(&sctp_mcore_workers[i]);
+		sctp_mcore_workers[i].cpuid = i;
+	}
+	/* Now start them all */
+	for (i = 0; i < mp_ncpus; i++) {
+		(void)kproc_create(sctp_mcore_thread,
+		    (void *)&sctp_mcore_workers[i],
+		    &sctp_mcore_workers[i].thread_proc,
+		    RFPROC,
+		    SCTP_KTHREAD_PAGES,
+		    SCTP_MCORE_NAME);
+
+	}
+}
+
+#endif
+
+
 void
 sctp_pcb_init()
 {
@@ -5565,6 +5710,10 @@ sctp_pcb_init()
 
 	sctp_startup_iterator();
 
+#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
+	sctp_startup_mcore_threads();
+#endif
+
 	/*
 	 * INIT the default VRF which for BSD is the only one, other O/S's
 	 * may have more. But initially they must start with one and then

sys/netinet/sctp_pcb.h

@@ -624,6 +624,12 @@ sctp_initiate_iterator(inp_func inpf,
     struct sctp_inpcb *,
     uint8_t co_off);
 
+#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
+void
+     sctp_queue_to_mcore(struct mbuf *m, int off, int cpu_to_use);
+
+#endif
+
 #ifdef INVARIANTS
 void
      sctp_validate_no_locks(struct sctp_inpcb *inp);

sys/netinet/sctp_structs.h

@@ -106,6 +106,31 @@ typedef void (*asoc_func) (struct sctp_inpcb *, struct sctp_tcb *, void *ptr,
 typedef int (*inp_func) (struct sctp_inpcb *, void *ptr, uint32_t val);
 typedef void (*end_func) (void *ptr, uint32_t val);
 
+#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
+/* whats on the mcore control struct */
+struct sctp_mcore_queue {
+	TAILQ_ENTRY(sctp_mcore_queue) next;
+	struct vnet *vn;
+	struct mbuf *m;
+	int off;
+	int v6;
+};
+
+TAILQ_HEAD(sctp_mcore_qhead, sctp_mcore_queue);
+
+struct sctp_mcore_ctrl {
+	SCTP_PROCESS_STRUCT thread_proc;
+	struct sctp_mcore_qhead que;
+	struct mtx core_mtx;
+	struct mtx que_mtx;
+	int running;
+	int cpuid;
+};
+
+
+#endif
+
+
 struct sctp_iterator {
 	TAILQ_ENTRY(sctp_iterator) sctp_nxt_itr;
 	struct vnet *vn;