[dpdk-dev,v11,03/18] lib: add new distributor code

Message ID 1490004522-183515-4-git-send-email-david.hunt@intel.com
State New
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Commit Message

David Hunt March 20, 2017, 10:08 a.m.
This patch includes the code for new burst-capable distributor library.

It also includes the rte_distributor_next.h file which will
be used as the public header once we add in the symbol versioning
for v20 and v1705 APIs, at which stage we will rename it to
rte_distributor.h.

The new distributor code contains a very similar API to the legacy code,
but now sends bursts of up to 8 mbufs to each worker. Flow ID's are
reduced to 15 bits for an optimal flow matching algorithm.

Signed-off-by: David Hunt <david.hunt@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
---
 lib/librte_distributor/Makefile                  |   1 +
 lib/librte_distributor/rte_distributor.c         | 628 +++++++++++++++++++++++
 lib/librte_distributor/rte_distributor_next.h    | 269 ++++++++++
 lib/librte_distributor/rte_distributor_private.h |  61 +++
 4 files changed, 959 insertions(+)
 create mode 100644 lib/librte_distributor/rte_distributor.c
 create mode 100644 lib/librte_distributor/rte_distributor_next.h

Patch hide | download patch | download mbox

diff --git a/lib/librte_distributor/Makefile b/lib/librte_distributor/Makefile
index b314ca6..74256ff 100644
--- a/lib/librte_distributor/Makefile
+++ b/lib/librte_distributor/Makefile
@@ -43,6 +43,7 @@  LIBABIVER := 1
 
 # all source are stored in SRCS-y
 SRCS-$(CONFIG_RTE_LIBRTE_DISTRIBUTOR) := rte_distributor_v20.c
+SRCS-$(CONFIG_RTE_LIBRTE_DISTRIBUTOR) += rte_distributor.c
 
 # install this header file
 SYMLINK-$(CONFIG_RTE_LIBRTE_DISTRIBUTOR)-include := rte_distributor.h
diff --git a/lib/librte_distributor/rte_distributor.c b/lib/librte_distributor/rte_distributor.c
new file mode 100644
index 0000000..75b0d47
--- /dev/null
+++ b/lib/librte_distributor/rte_distributor.c
@@ -0,0 +1,628 @@ 
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2017 Intel Corporation. All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <sys/queue.h>
+#include <string.h>
+#include <rte_mbuf.h>
+#include <rte_memory.h>
+#include <rte_cycles.h>
+#include <rte_memzone.h>
+#include <rte_errno.h>
+#include <rte_string_fns.h>
+#include <rte_eal_memconfig.h>
+#include <rte_compat.h>
+#include "rte_distributor_private.h"
+#include "rte_distributor_next.h"
+#include "rte_distributor_v20.h"
+
+TAILQ_HEAD(rte_dist_burst_list, rte_distributor_v1705);
+
+static struct rte_tailq_elem rte_dist_burst_tailq = {
+	.name = "RTE_DIST_BURST",
+};
+EAL_REGISTER_TAILQ(rte_dist_burst_tailq)
+
+/**** APIs called by workers ****/
+
+/**** Burst Packet APIs called by workers ****/
+
+void
+rte_distributor_request_pkt_v1705(struct rte_distributor_v1705 *d,
+		unsigned int worker_id, struct rte_mbuf **oldpkt,
+		unsigned int count)
+{
+	struct rte_distributor_buffer_v1705 *buf = &(d->bufs[worker_id]);
+	unsigned int i;
+
+	volatile int64_t *retptr64;
+
+	if (unlikely(d->alg_type == RTE_DIST_ALG_SINGLE)) {
+		rte_distributor_request_pkt(d->d_v20,
+			worker_id, oldpkt[0]);
+		return;
+	}
+
+	retptr64 = &(buf->retptr64[0]);
+	/* Spin while handshake bits are set (scheduler clears it) */
+	while (unlikely(*retptr64 & RTE_DISTRIB_GET_BUF)) {
+		rte_pause();
+		uint64_t t = rte_rdtsc()+100;
+
+		while (rte_rdtsc() < t)
+			rte_pause();
+	}
+
+	/*
+	 * OK, if we've got here, then the scheduler has just cleared the
+	 * handshake bits. Populate the retptrs with returning packets.
+	 */
+
+	for (i = count; i < RTE_DIST_BURST_SIZE; i++)
+		buf->retptr64[i] = 0;
+
+	/* Set Return bit for each packet returned */
+	for (i = count; i-- > 0; )
+		buf->retptr64[i] =
+			(((int64_t)(uintptr_t)(oldpkt[i])) <<
+			RTE_DISTRIB_FLAG_BITS) | RTE_DISTRIB_RETURN_BUF;
+
+	/*
+	 * Finally, set the GET_BUF  to signal to distributor that cache
+	 * line is ready for processing
+	 */
+	*retptr64 |= RTE_DISTRIB_GET_BUF;
+}
+
+int
+rte_distributor_poll_pkt_v1705(struct rte_distributor_v1705 *d,
+		unsigned int worker_id, struct rte_mbuf **pkts)
+{
+	struct rte_distributor_buffer_v1705 *buf = &d->bufs[worker_id];
+	uint64_t ret;
+	int count = 0;
+	unsigned int i;
+
+	if (unlikely(d->alg_type == RTE_DIST_ALG_SINGLE)) {
+		pkts[0] = rte_distributor_poll_pkt(d->d_v20, worker_id);
+		return (pkts[0]) ? 1 : 0;
+	}
+
+	/* If bit is set, return */
+	if (buf->bufptr64[0] & RTE_DISTRIB_GET_BUF)
+		return -1;
+
+	/* since bufptr64 is signed, this should be an arithmetic shift */
+	for (i = 0; i < RTE_DIST_BURST_SIZE; i++) {
+		if (likely(buf->bufptr64[i] & RTE_DISTRIB_VALID_BUF)) {
+			ret = buf->bufptr64[i] >> RTE_DISTRIB_FLAG_BITS;
+			pkts[count++] = (struct rte_mbuf *)((uintptr_t)(ret));
+		}
+	}
+
+	/*
+	 * so now we've got the contents of the cacheline into an  array of
+	 * mbuf pointers, so toggle the bit so scheduler can start working
+	 * on the next cacheline while we're working.
+	 */
+	buf->bufptr64[0] |= RTE_DISTRIB_GET_BUF;
+
+	return count;
+}
+
+int
+rte_distributor_get_pkt_v1705(struct rte_distributor_v1705 *d,
+		unsigned int worker_id, struct rte_mbuf **pkts,
+		struct rte_mbuf **oldpkt, unsigned int return_count)
+{
+	int count;
+
+	if (unlikely(d->alg_type == RTE_DIST_ALG_SINGLE)) {
+		if (return_count <= 1) {
+			pkts[0] = rte_distributor_get_pkt(d->d_v20,
+				worker_id, oldpkt[0]);
+			return (pkts[0]) ? 1 : 0;
+		} else
+			return -EINVAL;
+	}
+
+	rte_distributor_request_pkt_v1705(d, worker_id, oldpkt, return_count);
+
+	count = rte_distributor_poll_pkt_v1705(d, worker_id, pkts);
+	while (count == -1) {
+		uint64_t t = rte_rdtsc() + 100;
+
+		while (rte_rdtsc() < t)
+			rte_pause();
+
+		count = rte_distributor_poll_pkt_v1705(d, worker_id, pkts);
+	}
+	return count;
+}
+
+int
+rte_distributor_return_pkt_v1705(struct rte_distributor_v1705 *d,
+		unsigned int worker_id, struct rte_mbuf **oldpkt, int num)
+{
+	struct rte_distributor_buffer_v1705 *buf = &d->bufs[worker_id];
+	unsigned int i;
+
+	if (unlikely(d->alg_type == RTE_DIST_ALG_SINGLE)) {
+		if (num == 1)
+			return rte_distributor_return_pkt(d->d_v20,
+				worker_id, oldpkt[0]);
+		else
+			return -EINVAL;
+	}
+
+	for (i = 0; i < RTE_DIST_BURST_SIZE; i++)
+		/* Switch off the return bit first */
+		buf->retptr64[i] &= ~RTE_DISTRIB_RETURN_BUF;
+
+	for (i = num; i-- > 0; )
+		buf->retptr64[i] = (((int64_t)(uintptr_t)oldpkt[i]) <<
+			RTE_DISTRIB_FLAG_BITS) | RTE_DISTRIB_RETURN_BUF;
+
+	/* set the GET_BUF but even if we got no returns */
+	buf->retptr64[0] |= RTE_DISTRIB_GET_BUF;
+
+	return 0;
+}
+
+/**** APIs called on distributor core ***/
+
+/* stores a packet returned from a worker inside the returns array */
+static inline void
+store_return(uintptr_t oldbuf, struct rte_distributor_v1705 *d,
+		unsigned int *ret_start, unsigned int *ret_count)
+{
+	if (!oldbuf)
+		return;
+	/* store returns in a circular buffer */
+	d->returns.mbufs[(*ret_start + *ret_count) & RTE_DISTRIB_RETURNS_MASK]
+			= (void *)oldbuf;
+	*ret_start += (*ret_count == RTE_DISTRIB_RETURNS_MASK);
+	*ret_count += (*ret_count != RTE_DISTRIB_RETURNS_MASK);
+}
+
+/*
+ * Match then flow_ids (tags) of the incoming packets to the flow_ids
+ * of the inflight packets (both inflight on the workers and in each worker
+ * backlog). This will then allow us to pin those packets to the relevant
+ * workers to give us our atomic flow pinning.
+ */
+void
+find_match_scalar(struct rte_distributor_v1705 *d,
+			uint16_t *data_ptr,
+			uint16_t *output_ptr)
+{
+	struct rte_distributor_backlog *bl;
+	uint16_t i, j, w;
+
+	/*
+	 * Function overview:
+	 * 1. Loop through all worker ID's
+	 * 2. Compare the current inflights to the incoming tags
+	 * 3. Compare the current backlog to the incoming tags
+	 * 4. Add any matches to the output
+	 */
+
+	for (j = 0 ; j < RTE_DIST_BURST_SIZE; j++)
+		output_ptr[j] = 0;
+
+	for (i = 0; i < d->num_workers; i++) {
+		bl = &d->backlog[i];
+
+		for (j = 0; j < RTE_DIST_BURST_SIZE ; j++)
+			for (w = 0; w < RTE_DIST_BURST_SIZE; w++)
+				if (d->in_flight_tags[i][j] == data_ptr[w]) {
+					output_ptr[j] = i+1;
+					break;
+				}
+		for (j = 0; j < RTE_DIST_BURST_SIZE; j++)
+			for (w = 0; w < RTE_DIST_BURST_SIZE; w++)
+				if (bl->tags[j] == data_ptr[w]) {
+					output_ptr[j] = i+1;
+					break;
+				}
+	}
+
+	/*
+	 * At this stage, the output contains 8 16-bit values, with
+	 * each non-zero value containing the worker ID on which the
+	 * corresponding flow is pinned to.
+	 */
+}
+
+
+/*
+ * When the handshake bits indicate that there are packets coming
+ * back from the worker, this function is called to copy and store
+ * the valid returned pointers (store_return).
+ */
+static unsigned int
+handle_returns(struct rte_distributor_v1705 *d, unsigned int wkr)
+{
+	struct rte_distributor_buffer_v1705 *buf = &(d->bufs[wkr]);
+	uintptr_t oldbuf;
+	unsigned int ret_start = d->returns.start,
+			ret_count = d->returns.count;
+	unsigned int count = 0;
+	unsigned int i;
+
+	if (buf->retptr64[0] & RTE_DISTRIB_GET_BUF) {
+		for (i = 0; i < RTE_DIST_BURST_SIZE; i++) {
+			if (buf->retptr64[i] & RTE_DISTRIB_RETURN_BUF) {
+				oldbuf = ((uintptr_t)(buf->retptr64[i] >>
+					RTE_DISTRIB_FLAG_BITS));
+				/* store returns in a circular buffer */
+				store_return(oldbuf, d, &ret_start, &ret_count);
+				count++;
+				buf->retptr64[i] &= ~RTE_DISTRIB_RETURN_BUF;
+			}
+		}
+		d->returns.start = ret_start;
+		d->returns.count = ret_count;
+		/* Clear for the worker to populate with more returns */
+		buf->retptr64[0] = 0;
+	}
+	return count;
+}
+
+/*
+ * This function releases a burst (cache line) to a worker.
+ * It is called from the process function when a cacheline is
+ * full to make room for more packets for that worker, or when
+ * all packets have been assigned to bursts and need to be flushed
+ * to the workers.
+ * It also needs to wait for any outstanding packets from the worker
+ * before sending out new packets.
+ */
+static unsigned int
+release(struct rte_distributor_v1705 *d, unsigned int wkr)
+{
+	struct rte_distributor_buffer_v1705 *buf = &(d->bufs[wkr]);
+	unsigned int i;
+
+	while (!(d->bufs[wkr].bufptr64[0] & RTE_DISTRIB_GET_BUF))
+		rte_pause();
+
+	handle_returns(d, wkr);
+
+	buf->count = 0;
+
+	for (i = 0; i < d->backlog[wkr].count; i++) {
+		d->bufs[wkr].bufptr64[i] = d->backlog[wkr].pkts[i] |
+				RTE_DISTRIB_GET_BUF | RTE_DISTRIB_VALID_BUF;
+		d->in_flight_tags[wkr][i] = d->backlog[wkr].tags[i];
+	}
+	buf->count = i;
+	for ( ; i < RTE_DIST_BURST_SIZE ; i++) {
+		buf->bufptr64[i] = RTE_DISTRIB_GET_BUF;
+		d->in_flight_tags[wkr][i] = 0;
+	}
+
+	d->backlog[wkr].count = 0;
+
+	/* Clear the GET bit */
+	buf->bufptr64[0] &= ~RTE_DISTRIB_GET_BUF;
+	return  buf->count;
+
+}
+
+
+/* process a set of packets to distribute them to workers */
+int
+rte_distributor_process_v1705(struct rte_distributor_v1705 *d,
+		struct rte_mbuf **mbufs, unsigned int num_mbufs)
+{
+	unsigned int next_idx = 0;
+	static unsigned int wkr;
+	struct rte_mbuf *next_mb = NULL;
+	int64_t next_value = 0;
+	uint16_t new_tag = 0;
+	uint16_t flows[RTE_DIST_BURST_SIZE] __rte_cache_aligned;
+	unsigned int i, j, w, wid;
+
+	if (d->alg_type == RTE_DIST_ALG_SINGLE) {
+		/* Call the old API */
+		return rte_distributor_process(d->d_v20, mbufs, num_mbufs);
+	}
+
+	if (unlikely(num_mbufs == 0)) {
+		/* Flush out all non-full cache-lines to workers. */
+		for (wid = 0 ; wid < d->num_workers; wid++) {
+			if ((d->bufs[wid].bufptr64[0] & RTE_DISTRIB_GET_BUF)) {
+				release(d, wid);
+				handle_returns(d, wid);
+			}
+		}
+		return 0;
+	}
+
+	while (next_idx < num_mbufs) {
+		uint16_t matches[RTE_DIST_BURST_SIZE];
+		unsigned int pkts;
+
+		if (d->bufs[wkr].bufptr64[0] & RTE_DISTRIB_GET_BUF)
+			d->bufs[wkr].count = 0;
+
+		if ((num_mbufs - next_idx) < RTE_DIST_BURST_SIZE)
+			pkts = num_mbufs - next_idx;
+		else
+			pkts = RTE_DIST_BURST_SIZE;
+
+		for (i = 0; i < pkts; i++) {
+			if (mbufs[next_idx + i]) {
+				/* flows have to be non-zero */
+				flows[i] = mbufs[next_idx + i]->hash.usr | 1;
+			} else
+				flows[i] = 0;
+		}
+		for (; i < RTE_DIST_BURST_SIZE; i++)
+			flows[i] = 0;
+
+		find_match_scalar(d, &flows[0], &matches[0]);
+
+		/*
+		 * Matches array now contain the intended worker ID (+1) of
+		 * the incoming packets. Any zeroes need to be assigned
+		 * workers.
+		 */
+
+		for (j = 0; j < pkts; j++) {
+
+			next_mb = mbufs[next_idx++];
+			next_value = (((int64_t)(uintptr_t)next_mb) <<
+					RTE_DISTRIB_FLAG_BITS);
+			/*
+			 * User is advocated to set tag vaue for each
+			 * mbuf before calling rte_distributor_process.
+			 * User defined tags are used to identify flows,
+			 * or sessions.
+			 */
+			/* flows MUST be non-zero */
+			new_tag = (uint16_t)(next_mb->hash.usr) | 1;
+
+			/*
+			 * Uncommenting the next line will cause the find_match
+			 * function to be optimised out, making this function
+			 * do parallel (non-atomic) distribution
+			 */
+			/* matches[j] = 0; */
+
+			if (matches[j]) {
+				struct rte_distributor_backlog *bl =
+						&d->backlog[matches[j]-1];
+				if (unlikely(bl->count ==
+						RTE_DIST_BURST_SIZE)) {
+					release(d, matches[j]-1);
+				}
+
+				/* Add to worker that already has flow */
+				unsigned int idx = bl->count++;
+
+				bl->tags[idx] = new_tag;
+				bl->pkts[idx] = next_value;
+
+			} else {
+				struct rte_distributor_backlog *bl =
+						&d->backlog[wkr];
+				if (unlikely(bl->count ==
+						RTE_DIST_BURST_SIZE)) {
+					release(d, wkr);
+				}
+
+				/* Add to current worker worker */
+				unsigned int idx = bl->count++;
+
+				bl->tags[idx] = new_tag;
+				bl->pkts[idx] = next_value;
+				/*
+				 * Now that we've just added an unpinned flow
+				 * to a worker, we need to ensure that all
+				 * other packets with that same flow will go
+				 * to the same worker in this burst.
+				 */
+				for (w = j; w < pkts; w++)
+					if (flows[w] == new_tag)
+						matches[w] = wkr+1;
+			}
+		}
+		wkr++;
+		if (wkr >= d->num_workers)
+			wkr = 0;
+	}
+
+	/* Flush out all non-full cache-lines to workers. */
+	for (wid = 0 ; wid < d->num_workers; wid++)
+		if ((d->bufs[wid].bufptr64[0] & RTE_DISTRIB_GET_BUF))
+			release(d, wid);
+
+	return num_mbufs;
+}
+
+/* return to the caller, packets returned from workers */
+int
+rte_distributor_returned_pkts_v1705(struct rte_distributor_v1705 *d,
+		struct rte_mbuf **mbufs, unsigned int max_mbufs)
+{
+	struct rte_distributor_returned_pkts *returns = &d->returns;
+	unsigned int retval = (max_mbufs < returns->count) ?
+			max_mbufs : returns->count;
+	unsigned int i;
+
+	if (d->alg_type == RTE_DIST_ALG_SINGLE) {
+		/* Call the old API */
+		return rte_distributor_returned_pkts(d->d_v20,
+				mbufs, max_mbufs);
+	}
+
+	for (i = 0; i < retval; i++) {
+		unsigned int idx = (returns->start + i) &
+				RTE_DISTRIB_RETURNS_MASK;
+
+		mbufs[i] = returns->mbufs[idx];
+	}
+	returns->start += i;
+	returns->count -= i;
+
+	return retval;
+}
+
+/*
+ * Return the number of packets in-flight in a distributor, i.e. packets
+ * being workered on or queued up in a backlog.
+ */
+static inline unsigned int
+total_outstanding(const struct rte_distributor_v1705 *d)
+{
+	unsigned int wkr, total_outstanding = 0;
+
+	for (wkr = 0; wkr < d->num_workers; wkr++)
+		total_outstanding += d->backlog[wkr].count;
+
+	return total_outstanding;
+}
+
+/*
+ * Flush the distributor, so that there are no outstanding packets in flight or
+ * queued up.
+ */
+int
+rte_distributor_flush_v1705(struct rte_distributor_v1705 *d)
+{
+	const unsigned int flushed = total_outstanding(d);
+	unsigned int wkr;
+
+	if (d->alg_type == RTE_DIST_ALG_SINGLE) {
+		/* Call the old API */
+		return rte_distributor_flush(d->d_v20);
+	}
+
+	while (total_outstanding(d) > 0)
+		rte_distributor_process_v1705(d, NULL, 0);
+
+	/*
+	 * Send empty burst to all workers to allow them to exit
+	 * gracefully, should they need to.
+	 */
+	rte_distributor_process_v1705(d, NULL, 0);
+
+	for (wkr = 0; wkr < d->num_workers; wkr++)
+		handle_returns(d, wkr);
+
+	return flushed;
+}
+
+/* clears the internal returns array in the distributor */
+void
+rte_distributor_clear_returns_v1705(struct rte_distributor_v1705 *d)
+{
+	unsigned int wkr;
+
+	if (d->alg_type == RTE_DIST_ALG_SINGLE) {
+		/* Call the old API */
+		rte_distributor_clear_returns(d->d_v20);
+	}
+
+	/* throw away returns, so workers can exit */
+	for (wkr = 0; wkr < d->num_workers; wkr++)
+		d->bufs[wkr].retptr64[0] = 0;
+}
+
+/* creates a distributor instance */
+struct rte_distributor_v1705 *
+rte_distributor_create_v1705(const char *name,
+		unsigned int socket_id,
+		unsigned int num_workers,
+		unsigned int alg_type)
+{
+	struct rte_distributor_v1705 *d;
+	struct rte_dist_burst_list *dist_burst_list;
+	char mz_name[RTE_MEMZONE_NAMESIZE];
+	const struct rte_memzone *mz;
+	unsigned int i;
+
+	/* TODO Reorganise function properly around RTE_DIST_ALG_SINGLE/BURST */
+
+	/* compilation-time checks */
+	RTE_BUILD_BUG_ON((sizeof(*d) & RTE_CACHE_LINE_MASK) != 0);
+	RTE_BUILD_BUG_ON((RTE_DISTRIB_MAX_WORKERS & 7) != 0);
+
+	if (alg_type == RTE_DIST_ALG_SINGLE) {
+		d = malloc(sizeof(struct rte_distributor_v1705));
+		d->d_v20 = rte_distributor_create(name,
+				socket_id, num_workers);
+		if (d->d_v20 == NULL) {
+			/* rte_errno will have been set */
+			return NULL;
+		}
+		d->alg_type = alg_type;
+		return d;
+	}
+
+	if (name == NULL || num_workers >= RTE_DISTRIB_MAX_WORKERS) {
+		rte_errno = EINVAL;
+		return NULL;
+	}
+
+	snprintf(mz_name, sizeof(mz_name), RTE_DISTRIB_PREFIX"%s", name);
+	mz = rte_memzone_reserve(mz_name, sizeof(*d), socket_id, NO_FLAGS);
+	if (mz == NULL) {
+		rte_errno = ENOMEM;
+		return NULL;
+	}
+
+	d = mz->addr;
+	snprintf(d->name, sizeof(d->name), "%s", name);
+	d->num_workers = num_workers;
+	d->alg_type = alg_type;
+	d->dist_match_fn = RTE_DIST_MATCH_SCALAR;
+
+	/*
+	 * Set up the backog tags so they're pointing at the second cache
+	 * line for performance during flow matching
+	 */
+	for (i = 0 ; i < num_workers ; i++)
+		d->backlog[i].tags = &d->in_flight_tags[i][RTE_DIST_BURST_SIZE];
+
+	dist_burst_list = RTE_TAILQ_CAST(rte_dist_burst_tailq.head,
+					  rte_dist_burst_list);
+
+
+	rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
+	TAILQ_INSERT_TAIL(dist_burst_list, d, next);
+	rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+
+	return d;
+}
diff --git a/lib/librte_distributor/rte_distributor_next.h b/lib/librte_distributor/rte_distributor_next.h
new file mode 100644
index 0000000..0034020
--- /dev/null
+++ b/lib/librte_distributor/rte_distributor_next.h
@@ -0,0 +1,269 @@ 
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2017 Intel Corporation. All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RTE_DISTRIBUTOR_H_
+#define _RTE_DISTRIBUTOR_H_
+
+/**
+ * @file
+ * RTE distributor
+ *
+ * The distributor is a component which is designed to pass packets
+ * one-at-a-time to workers, with dynamic load balancing.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Type of distribution (burst/single) */
+enum rte_distributor_alg_type {
+	RTE_DIST_ALG_BURST = 0,
+	RTE_DIST_ALG_SINGLE,
+	RTE_DIST_NUM_ALG_TYPES
+};
+
+struct rte_distributor_v1705;
+struct rte_mbuf;
+
+/**
+ * Function to create a new distributor instance
+ *
+ * Reserves the memory needed for the distributor operation and
+ * initializes the distributor to work with the configured number of workers.
+ *
+ * @param name
+ *   The name to be given to the distributor instance.
+ * @param socket_id
+ *   The NUMA node on which the memory is to be allocated
+ * @param num_workers
+ *   The maximum number of workers that will request packets from this
+ *   distributor
+ * @param alg_type
+ *   Call the legacy API, or use the new burst API. legacy uses 32-bit
+ *   flow ID, and works on a single packet at a time. Latest uses 15-
+ *   bit flow ID and works on up to 8 packets at a time to worers.
+ * @return
+ *   The newly created distributor instance
+ */
+struct rte_distributor_v1705 *
+rte_distributor_create_v1705(const char *name, unsigned int socket_id,
+		unsigned int num_workers,
+		unsigned int alg_type);
+
+/*  *** APIS to be called on the distributor lcore ***  */
+/*
+ * The following APIs are the public APIs which are designed for use on a
+ * single lcore which acts as the distributor lcore for a given distributor
+ * instance. These functions cannot be called on multiple cores simultaneously
+ * without using locking to protect access to the internals of the distributor.
+ *
+ * NOTE: a given lcore cannot act as both a distributor lcore and a worker lcore
+ * for the same distributor instance, otherwise deadlock will result.
+ */
+
+/**
+ * Process a set of packets by distributing them among workers that request
+ * packets. The distributor will ensure that no two packets that have the
+ * same flow id, or tag, in the mbuf will be processed on different cores at
+ * the same time.
+ *
+ * The user is advocated to set tag for each mbuf before calling this function.
+ * If user doesn't set the tag, the tag value can be various values depending on
+ * driver implementation and configuration.
+ *
+ * This is not multi-thread safe and should only be called on a single lcore.
+ *
+ * @param d
+ *   The distributor instance to be used
+ * @param mbufs
+ *   The mbufs to be distributed
+ * @param num_mbufs
+ *   The number of mbufs in the mbufs array
+ * @return
+ *   The number of mbufs processed.
+ */
+int
+rte_distributor_process_v1705(struct rte_distributor_v1705 *d,
+		struct rte_mbuf **mbufs, unsigned int num_mbufs);
+
+/**
+ * Get a set of mbufs that have been returned to the distributor by workers
+ *
+ * This should only be called on the same lcore as rte_distributor_process()
+ *
+ * @param d
+ *   The distributor instance to be used
+ * @param mbufs
+ *   The mbufs pointer array to be filled in
+ * @param max_mbufs
+ *   The size of the mbufs array
+ * @return
+ *   The number of mbufs returned in the mbufs array.
+ */
+int
+rte_distributor_returned_pkts_v1705(struct rte_distributor_v1705 *d,
+		struct rte_mbuf **mbufs, unsigned int max_mbufs);
+
+/**
+ * Flush the distributor component, so that there are no in-flight or
+ * backlogged packets awaiting processing
+ *
+ * This should only be called on the same lcore as rte_distributor_process()
+ *
+ * @param d
+ *   The distributor instance to be used
+ * @return
+ *   The number of queued/in-flight packets that were completed by this call.
+ */
+int
+rte_distributor_flush_v1705(struct rte_distributor_v1705 *d);
+
+/**
+ * Clears the array of returned packets used as the source for the
+ * rte_distributor_returned_pkts() API call.
+ *
+ * This should only be called on the same lcore as rte_distributor_process()
+ *
+ * @param d
+ *   The distributor instance to be used
+ */
+void
+rte_distributor_clear_returns_v1705(struct rte_distributor_v1705 *d);
+
+/*  *** APIS to be called on the worker lcores ***  */
+/*
+ * The following APIs are the public APIs which are designed for use on
+ * multiple lcores which act as workers for a distributor. Each lcore should use
+ * a unique worker id when requesting packets.
+ *
+ * NOTE: a given lcore cannot act as both a distributor lcore and a worker lcore
+ * for the same distributor instance, otherwise deadlock will result.
+ */
+
+/**
+ * API called by a worker to get new packets to process. Any previous packets
+ * given to the worker is assumed to have completed processing, and may be
+ * optionally returned to the distributor via the oldpkt parameter.
+ *
+ * @param d
+ *   The distributor instance to be used
+ * @param worker_id
+ *   The worker instance number to use - must be less that num_workers passed
+ *   at distributor creation time.
+ * @param pkts
+ *   The mbufs pointer array to be filled in (up to 8 packets)
+ * @param oldpkt
+ *   The previous packet, if any, being processed by the worker
+ * @param retcount
+ *   The number of packets being returned
+ *
+ * @return
+ *   The number of packets in the pkts array
+ */
+int
+rte_distributor_get_pkt_v1705(struct rte_distributor_v1705 *d,
+	unsigned int worker_id, struct rte_mbuf **pkts,
+	struct rte_mbuf **oldpkt, unsigned int retcount);
+
+/**
+ * API called by a worker to return a completed packet without requesting a
+ * new packet, for example, because a worker thread is shutting down
+ *
+ * @param d
+ *   The distributor instance to be used
+ * @param worker_id
+ *   The worker instance number to use - must be less that num_workers passed
+ *   at distributor creation time.
+ * @param oldpkt
+ *   The previous packets being processed by the worker
+ * @param num
+ *   The number of packets in the oldpkt array
+ */
+int
+rte_distributor_return_pkt_v1705(struct rte_distributor_v1705 *d,
+	unsigned int worker_id, struct rte_mbuf **oldpkt, int num);
+
+/**
+ * API called by a worker to request a new packet to process.
+ * Any previous packet given to the worker is assumed to have completed
+ * processing, and may be optionally returned to the distributor via
+ * the oldpkt parameter.
+ * Unlike rte_distributor_get_pkt_burst(), this function does not wait for a
+ * new packet to be provided by the distributor.
+ *
+ * NOTE: after calling this function, rte_distributor_poll_pkt_burst() should
+ * be used to poll for the packet requested. The rte_distributor_get_pkt_burst()
+ * API should *not* be used to try and retrieve the new packet.
+ *
+ * @param d
+ *   The distributor instance to be used
+ * @param worker_id
+ *   The worker instance number to use - must be less that num_workers passed
+ *   at distributor creation time.
+ * @param oldpkt
+ *   The returning packets, if any, processed by the worker
+ * @param count
+ *   The number of returning packets
+ */
+void
+rte_distributor_request_pkt_v1705(struct rte_distributor_v1705 *d,
+		unsigned int worker_id, struct rte_mbuf **oldpkt,
+		unsigned int count);
+
+/**
+ * API called by a worker to check for a new packet that was previously
+ * requested by a call to rte_distributor_request_pkt(). It does not wait
+ * for the new packet to be available, but returns NULL if the request has
+ * not yet been fulfilled by the distributor.
+ *
+ * @param d
+ *   The distributor instance to be used
+ * @param worker_id
+ *   The worker instance number to use - must be less that num_workers passed
+ *   at distributor creation time.
+ * @param mbufs
+ *   The array of mbufs being given to the worker
+ *
+ * @return
+ *   The number of packets being given to the worker thread, zero if no
+ *   packet is yet available.
+ */
+int
+rte_distributor_poll_pkt_v1705(struct rte_distributor_v1705 *d,
+		unsigned int worker_id, struct rte_mbuf **mbufs);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/lib/librte_distributor/rte_distributor_private.h b/lib/librte_distributor/rte_distributor_private.h
index b1c0f66..82b0daf 100644
--- a/lib/librte_distributor/rte_distributor_private.h
+++ b/lib/librte_distributor/rte_distributor_private.h
@@ -129,6 +129,67 @@  struct rte_distributor {
 	struct rte_distributor_returned_pkts returns;
 };
 
+/* All different signature compare functions */
+enum rte_distributor_match_function {
+	RTE_DIST_MATCH_SCALAR = 0,
+	RTE_DIST_MATCH_VECTOR,
+	RTE_DIST_NUM_MATCH_FNS
+};
+
+/**
+ * Buffer structure used to pass the pointer data between cores. This is cache
+ * line aligned, but to improve performance and prevent adjacent cache-line
+ * prefetches of buffers for other workers, e.g. when worker 1's buffer is on
+ * the next cache line to worker 0, we pad this out to two cache lines.
+ * We can pass up to 8 mbufs at a time in one cacheline.
+ * There is a separate cacheline for returns in the burst API.
+ */
+struct rte_distributor_buffer_v1705 {
+	volatile int64_t bufptr64[RTE_DIST_BURST_SIZE]
+		__rte_cache_aligned; /* <= outgoing to worker */
+
+	int64_t pad1 __rte_cache_aligned;    /* <= one cache line  */
+
+	volatile int64_t retptr64[RTE_DIST_BURST_SIZE]
+		__rte_cache_aligned; /* <= incoming from worker */
+
+	int64_t pad2 __rte_cache_aligned;    /* <= one cache line  */
+
+	int count __rte_cache_aligned;       /* <= number of current mbufs */
+};
+
+struct rte_distributor_v1705 {
+	TAILQ_ENTRY(rte_distributor_v1705) next;    /**< Next in list. */
+
+	char name[RTE_DISTRIBUTOR_NAMESIZE];  /**< Name of the ring. */
+	unsigned int num_workers;             /**< Number of workers polling */
+	unsigned int alg_type;                /**< Number of alg types */
+
+	/**>
+	 * First cache line in the this array are the tags inflight
+	 * on the worker core. Second cache line are the backlog
+	 * that are going to go to the worker core.
+	 */
+	uint16_t in_flight_tags[RTE_DISTRIB_MAX_WORKERS][RTE_DIST_BURST_SIZE*2]
+			__rte_cache_aligned;
+
+	struct rte_distributor_backlog backlog[RTE_DISTRIB_MAX_WORKERS]
+			__rte_cache_aligned;
+
+	struct rte_distributor_buffer_v1705 bufs[RTE_DISTRIB_MAX_WORKERS];
+
+	struct rte_distributor_returned_pkts returns;
+
+	enum rte_distributor_match_function dist_match_fn;
+
+	struct rte_distributor *d_v20;
+};
+
+void
+find_match_scalar(struct rte_distributor_v1705 *d,
+			uint16_t *data_ptr,
+			uint16_t *output_ptr);
+
 #ifdef __cplusplus
 }
 #endif