1 files changed, 346 insertions, 0 deletions

diff --git a/lib/libtle_l4p/udp_stream.c b/lib/libtle_l4p/udp_stream.c
new file mode 100644
index 0000000..9f379d9
--- /dev/null
+++ b/lib/libtle_l4p/udp_stream.c
@@ -0,0 +1,346 @@
+/*
+ * Copyright (c) 2016  Intel Corporation.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <string.h>
+#include <rte_malloc.h>
+#include <rte_errno.h>
+#include <rte_ethdev.h>
+#include <rte_ip.h>
+#include <rte_udp.h>
+
+#include "udp_stream.h"
+#include "misc.h"
+
+static void
+unuse_stream(struct tle_udp_stream *s)
+{
+	s->s.type = TLE_VNUM;
+	rte_atomic32_set(&s->rx.use, INT32_MIN);
+	rte_atomic32_set(&s->tx.use, INT32_MIN);
+}
+
+static void
+fini_stream(struct tle_udp_stream *s)
+{
+	if (s != NULL) {
+		rte_free(s->rx.q);
+		rte_free(s->tx.drb.r);
+	}
+}
+
+static void
+udp_fini_streams(struct tle_ctx *ctx)
+{
+	uint32_t i;
+	struct tle_udp_stream *s;
+
+	s = ctx->streams.buf;
+	if (s != NULL) {
+		for (i = 0; i != ctx->prm.max_streams; i++)
+			fini_stream(s + i);
+	}
+
+	rte_free(s);
+	ctx->streams.buf = NULL;
+	STAILQ_INIT(&ctx->streams.free);
+}
+
+static int
+init_stream(struct tle_ctx *ctx, struct tle_udp_stream *s)
+{
+	size_t bsz, rsz, sz;
+	uint32_t i, k, n, nb;
+	struct tle_drb *drb;
+	char name[RTE_RING_NAMESIZE];
+
+	/* init RX part. */
+
+	n = RTE_MAX(ctx->prm.max_stream_rbufs, 1U);
+	n = rte_align32pow2(n);
+	sz = sizeof(*s->rx.q) + n * sizeof(s->rx.q->ring[0]);
+
+	s->rx.q = rte_zmalloc_socket(NULL, sz, RTE_CACHE_LINE_SIZE,
+		ctx->prm.socket_id);
+	if (s->rx.q == NULL) {
+		UDP_LOG(ERR, "%s(%p): allocation of %zu bytes on socket %d "
+			"failed with error code: %d\n",
+			__func__, s, sz, ctx->prm.socket_id, rte_errno);
+		return -ENOMEM;
+	}
+
+	snprintf(name, sizeof(name), "%p@%zu", s, sz);
+	rte_ring_init(s->rx.q, name, n, RING_F_SP_ENQ);
+
+	/* init TX part. */
+
+	nb = drb_nb_elem(ctx);
+	k = calc_stream_drb_num(ctx, nb);
+	n = rte_align32pow2(k);
+
+	/* size of the drbs ring */
+	rsz = sizeof(*s->tx.drb.r) + n * sizeof(s->tx.drb.r->ring[0]);
+	rsz = RTE_ALIGN_CEIL(rsz, RTE_CACHE_LINE_SIZE);
+
+	/* size of the drb. */
+	bsz = tle_drb_calc_size(nb);
+
+	/* total stream drbs size. */
+	sz = rsz + bsz * k;
+
+	s->tx.drb.r = rte_zmalloc_socket(NULL, sz, RTE_CACHE_LINE_SIZE,
+		ctx->prm.socket_id);
+	if (s->tx.drb.r == NULL) {
+		UDP_LOG(ERR, "%s(%p): allocation of %zu bytes on socket %d "
+			"failed with error code: %d\n",
+			__func__, s, sz, ctx->prm.socket_id, rte_errno);
+		return -ENOMEM;
+	}
+
+	snprintf(name, sizeof(name), "%p@%zu", s, sz);
+	rte_ring_init(s->tx.drb.r, name, n, 0);
+
+	for (i = 0; i != k; i++) {
+		drb = (struct tle_drb *)((uintptr_t)s->tx.drb.r +
+			rsz + bsz * i);
+		drb->udata = s;
+		drb->size = nb;
+		rte_ring_enqueue(s->tx.drb.r, drb);
+	}
+
+	s->tx.drb.nb_elem = nb;
+	s->tx.drb.nb_max = k;
+
+	/* mark stream as avaialble to use. */
+
+	s->s.ctx = ctx;
+	unuse_stream(s);
+	STAILQ_INSERT_TAIL(&ctx->streams.free, &s->s, link);
+
+	return 0;
+}
+
+static void
+udp_free_drbs(struct tle_stream *s, struct tle_drb *drb[], uint32_t nb_drb)
+{
+	struct tle_udp_stream *us;
+
+	us = (struct tle_udp_stream *)s;
+	rte_ring_enqueue_burst(us->tx.drb.r, (void **)drb, nb_drb);
+}
+
+static int
+udp_init_streams(struct tle_ctx *ctx)
+{
+	size_t sz;
+	uint32_t i;
+	int32_t rc;
+	struct tle_udp_stream *s;
+
+	sz = sizeof(*s) * ctx->prm.max_streams;
+	s = rte_zmalloc_socket(NULL, sz, RTE_CACHE_LINE_SIZE,
+		ctx->prm.socket_id);
+	if (s == NULL) {
+		UDP_LOG(ERR, "allocation of %zu bytes on socket %d "
+			"for %u udp_streams failed\n",
+			sz, ctx->prm.socket_id, ctx->prm.max_streams);
+		return -ENOMEM;
+	}
+
+	ctx->streams.buf = s;
+	STAILQ_INIT(&ctx->streams.free);
+
+	for (i = 0; i != ctx->prm.max_streams; i++) {
+		rc = init_stream(ctx, s + i);
+		if (rc != 0) {
+			UDP_LOG(ERR, "initalisation of %u-th stream failed", i);
+			udp_fini_streams(ctx);
+			return rc;
+		}
+	}
+
+	return 0;
+}
+
+static void __attribute__((constructor))
+udp_stream_setup(void)
+{
+	static const struct stream_ops udp_ops = {
+		.init_streams = udp_init_streams,
+		.fini_streams = udp_fini_streams,
+		.free_drbs = udp_free_drbs,
+	};
+
+	tle_stream_ops[TLE_PROTO_UDP] = udp_ops;
+}
+
+static inline void
+stream_down(struct tle_udp_stream *s)
+{
+	rwl_down(&s->rx.use);
+	rwl_down(&s->tx.use);
+}
+
+static inline void
+stream_up(struct tle_udp_stream *s)
+{
+	rwl_up(&s->rx.use);
+	rwl_up(&s->tx.use);
+}
+
+static int
+check_stream_prm(const struct tle_ctx *ctx,
+	const struct tle_udp_stream_param *prm)
+{
+	if ((prm->local_addr.ss_family != AF_INET &&
+			prm->local_addr.ss_family != AF_INET6) ||
+			prm->local_addr.ss_family != prm->remote_addr.ss_family)
+		return -EINVAL;
+
+	/* callback and event notifications mechanisms are mutually exclusive */
+	if ((prm->recv_ev != NULL && prm->recv_cb.func != NULL) ||
+			(prm->send_ev != NULL && prm->send_cb.func != NULL))
+		return -EINVAL;
+
+	/* check does context support desired address family. */
+	if ((prm->local_addr.ss_family == AF_INET &&
+			ctx->prm.lookup4 == NULL) ||
+			(prm->local_addr.ss_family == AF_INET6 &&
+			ctx->prm.lookup6 == NULL))
+		return -EINVAL;
+
+	return 0;
+}
+
+struct tle_stream *
+tle_udp_stream_open(struct tle_ctx *ctx,
+	const struct tle_udp_stream_param *prm)
+{
+	struct tle_udp_stream *s;
+	int32_t rc;
+
+	if (ctx == NULL || prm == NULL || check_stream_prm(ctx, prm) != 0) {
+		rte_errno = EINVAL;
+		return NULL;
+	}
+
+	s = (struct tle_udp_stream *)get_stream(ctx);
+	if (s == NULL)	{
+		rte_errno = ENFILE;
+		return NULL;
+
+	/* some TX still pending for that stream. */
+	} else if (UDP_STREAM_TX_PENDING(s)) {
+		put_stream(ctx, &s->s, 0);
+		rte_errno = EAGAIN;
+		return NULL;
+	}
+
+	/* copy input parameters. */
+	s->prm = *prm;
+
+	/* setup L4 ports and L3 addresses fields. */
+	rc = stream_fill_ctx(ctx, &s->s,
+		(const struct sockaddr *)&prm->local_addr,
+		(const struct sockaddr *)&prm->remote_addr);
+
+	if (rc != 0) {
+		put_stream(ctx, &s->s, 1);
+		s = NULL;
+		rte_errno = rc;
+	} else {
+		/* setup stream notification menchanism */
+		s->rx.ev = prm->recv_ev;
+		s->rx.cb = prm->recv_cb;
+		s->tx.ev = prm->send_ev;
+		s->tx.cb = prm->send_cb;
+
+		/* mark stream as avaialbe for RX/TX */
+		if (s->tx.ev != NULL)
+			tle_event_raise(s->tx.ev);
+		stream_up(s);
+	}
+
+	return &s->s;
+}
+
+int
+tle_udp_stream_close(struct tle_stream *us)
+{
+	int32_t rc;
+	struct tle_ctx *ctx;
+	struct tle_udp_stream *s;
+
+	static const struct tle_stream_cb zcb;
+
+	s = UDP_STREAM(us);
+	if (us == NULL || s->s.type >= TLE_VNUM)
+		return -EINVAL;
+
+	ctx = s->s.ctx;
+
+	/* mark stream as unavaialbe for RX/TX. */
+	stream_down(s);
+
+	/* reset stream events if any. */
+	if (s->rx.ev != NULL) {
+		tle_event_idle(s->rx.ev);
+		s->rx.ev = NULL;
+	}
+	if (s->tx.ev != NULL) {
+		tle_event_idle(s->tx.ev);
+		s->tx.ev = NULL;
+	}
+
+	s->rx.cb = zcb;
+	s->tx.cb = zcb;
+
+	/* free stream's destination port */
+	rc = stream_clear_ctx(ctx, &s->s);
+
+	/* empty stream's RX queue */
+	empty_mbuf_ring(s->rx.q);
+
+	/*
+	 * mark the stream as free again.
+	 * if there still are pkts queued for TX,
+	 * then put this stream to the tail of free list.
+	 */
+	put_stream(ctx, &s->s, UDP_STREAM_TX_FINISHED(s));
+	return rc;
+}
+
+int
+tle_udp_stream_get_param(const struct tle_stream *us,
+	struct tle_udp_stream_param *prm)
+{
+	struct sockaddr_in *lin4;
+	struct sockaddr_in6 *lin6;
+	const struct tle_udp_stream *s;
+
+	s = UDP_STREAM(us);
+	if (prm == NULL || us == NULL || s->s.type >= TLE_VNUM)
+		return -EINVAL;
+
+	prm[0] = s->prm;
+	if (prm->local_addr.ss_family == AF_INET) {
+		lin4 = (struct sockaddr_in *)&prm->local_addr;
+		lin4->sin_port = s->s.port.dst;
+	} else if (s->prm.local_addr.ss_family == AF_INET6) {
+		lin6 = (struct sockaddr_in6 *)&prm->local_addr;
+		lin6->sin6_port = s->s.port.dst;
+	}
+
+	return 0;
+}