[dpdk-dev] [PATCH v4 16/29] node: add ethdev Rx node

[<jerinj@marvell.com>]

From: Nithin Dabilpuram <ndabilpuram@marvell.com>

Add source rte_node ethdev_rx process function and register
it. This node is a source node that will be called periodically
and when called, performs rte_eth_rx_burst() on a specific
(port, queue) pair and enqueue them as stream of objects to
next node.

Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
Signed-off-by: Kiran Kumar K <kirankumark@marvell.com>
---
 lib/librte_node/Makefile         |   3 +-
 lib/librte_node/ethdev_rx.c      | 221 +++++++++++++++++++++++++++++++
 lib/librte_node/ethdev_rx_priv.h |  81 +++++++++++
 lib/librte_node/meson.build      |   4 +-
 4 files changed, 306 insertions(+), 3 deletions(-)
 create mode 100644 lib/librte_node/ethdev_rx.c
 create mode 100644 lib/librte_node/ethdev_rx_priv.h

diff --git a/lib/librte_node/Makefile b/lib/librte_node/Makefile
index dbc8e1d44..314149385 100644
--- a/lib/librte_node/Makefile
+++ b/lib/librte_node/Makefile
@@ -11,12 +11,13 @@ CFLAGS += -O3 -DALLOW_EXPERIMENTAL_API
 CFLAGS += $(WERROR_FLAGS)
 # Strict-aliasing rules are violated by uint8_t[] to context size casts.
 CFLAGS += -fno-strict-aliasing
-LDLIBS += -lrte_eal -lrte_graph
+LDLIBS += -lrte_eal -lrte_graph -lrte_ethdev
 
 EXPORT_MAP := rte_node_version.map
 
 # all source are stored in SRCS-y
 SRCS-$(CONFIG_RTE_LIBRTE_NODE) += null.c
 SRCS-$(CONFIG_RTE_LIBRTE_NODE) += log.c
+SRCS-$(CONFIG_RTE_LIBRTE_NODE) += ethdev_rx.c
 
 include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/lib/librte_node/ethdev_rx.c b/lib/librte_node/ethdev_rx.c
new file mode 100644
index 000000000..5cc736598
--- /dev/null
+++ b/lib/librte_node/ethdev_rx.c
@@ -0,0 +1,221 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(C) 2020 Marvell International Ltd.
+ */
+
+#include <rte_debug.h>
+#include <rte_ethdev.h>
+#include <rte_ether.h>
+#include <rte_graph.h>
+#include <rte_graph_worker.h>
+#include <rte_mbuf.h>
+
+#include "ethdev_rx_priv.h"
+#include "node_private.h"
+
+static struct ethdev_rx_node_main ethdev_rx_main;
+
+static __rte_always_inline uint16_t
+ethdev_rx_node_process_inline(struct rte_graph *graph, struct rte_node *node,
+			      uint16_t port, uint16_t queue)
+{
+	uint16_t count, next_index = ETHDEV_RX_NEXT_IP4_LOOKUP;
+
+	/* Get pkts from port */
+	count = rte_eth_rx_burst(port, queue, (struct rte_mbuf **)node->objs,
+				 RTE_GRAPH_BURST_SIZE);
+
+	if (!count)
+		return 0;
+	node->idx = count;
+	/* Enqueue to next node */
+	rte_node_next_stream_move(graph, node, next_index);
+
+	return count;
+}
+
+static __rte_always_inline uint16_t
+ethdev_rx_node_process(struct rte_graph *graph, struct rte_node *node,
+		       void **objs, uint16_t cnt)
+{
+	ethdev_rx_node_ctx_t *ctx = (ethdev_rx_node_ctx_t *)node->ctx;
+	uint16_t n_pkts = 0;
+
+	RTE_SET_USED(objs);
+	RTE_SET_USED(cnt);
+
+	n_pkts = ethdev_rx_node_process_inline(graph, node, ctx->port_id,
+					       ctx->queue_id);
+	return n_pkts;
+}
+
+static inline uint32_t
+l3_ptype(uint16_t etype, uint32_t ptype)
+{
+	ptype = ptype & ~RTE_PTYPE_L3_MASK;
+	if (etype == rte_cpu_to_be_16(RTE_ETHER_TYPE_IPV4))
+		ptype |= RTE_PTYPE_L3_IPV4_EXT_UNKNOWN;
+	else if (etype == rte_cpu_to_be_16(RTE_ETHER_TYPE_IPV6))
+		ptype |= RTE_PTYPE_L3_IPV6_EXT_UNKNOWN;
+	return ptype;
+}
+
+/* Callback for soft ptype parsing */
+static uint16_t
+eth_pkt_parse_cb(uint16_t port, uint16_t queue, struct rte_mbuf **mbufs,
+		 uint16_t nb_pkts, uint16_t max_pkts, void *user_param)
+{
+	struct rte_mbuf *mbuf0, *mbuf1, *mbuf2, *mbuf3;
+	struct rte_ether_hdr *eth_hdr;
+	uint16_t etype, n_left;
+	struct rte_mbuf **pkts;
+
+	RTE_SET_USED(port);
+	RTE_SET_USED(queue);
+	RTE_SET_USED(max_pkts);
+	RTE_SET_USED(user_param);
+
+	pkts = mbufs;
+	n_left = nb_pkts;
+	while (n_left >= 12) {
+
+		/* Prefetch next-next mbufs */
+		rte_prefetch0(pkts[8]);
+		rte_prefetch0(pkts[9]);
+		rte_prefetch0(pkts[10]);
+		rte_prefetch0(pkts[11]);
+
+		/* Prefetch next mbuf data */
+		rte_prefetch0(
+			rte_pktmbuf_mtod(pkts[4], struct rte_ether_hdr *));
+		rte_prefetch0(
+			rte_pktmbuf_mtod(pkts[5], struct rte_ether_hdr *));
+		rte_prefetch0(
+			rte_pktmbuf_mtod(pkts[6], struct rte_ether_hdr *));
+		rte_prefetch0(
+			rte_pktmbuf_mtod(pkts[7], struct rte_ether_hdr *));
+
+		mbuf0 = pkts[0];
+		mbuf1 = pkts[1];
+		mbuf2 = pkts[2];
+		mbuf3 = pkts[3];
+		pkts += 4;
+		n_left -= 4;
+
+		/* Extract ptype of mbuf0 */
+		eth_hdr = rte_pktmbuf_mtod(mbuf0, struct rte_ether_hdr *);
+		etype = eth_hdr->ether_type;
+		mbuf0->packet_type = l3_ptype(etype, 0);
+
+		/* Extract ptype of mbuf1 */
+		eth_hdr = rte_pktmbuf_mtod(mbuf1, struct rte_ether_hdr *);
+		etype = eth_hdr->ether_type;
+		mbuf1->packet_type = l3_ptype(etype, 0);
+
+		/* Extract ptype of mbuf2 */
+		eth_hdr = rte_pktmbuf_mtod(mbuf2, struct rte_ether_hdr *);
+		etype = eth_hdr->ether_type;
+		mbuf2->packet_type = l3_ptype(etype, 0);
+
+		/* Extract ptype of mbuf3 */
+		eth_hdr = rte_pktmbuf_mtod(mbuf3, struct rte_ether_hdr *);
+		etype = eth_hdr->ether_type;
+		mbuf3->packet_type = l3_ptype(etype, 0);
+	}
+
+	while (n_left > 0) {
+		mbuf0 = pkts[0];
+
+		pkts += 1;
+		n_left -= 1;
+
+		/* Extract ptype of mbuf0 */
+		eth_hdr = rte_pktmbuf_mtod(mbuf0, struct rte_ether_hdr *);
+		etype = eth_hdr->ether_type;
+		mbuf0->packet_type = l3_ptype(etype, 0);
+	}
+
+	return nb_pkts;
+}
+
+#define MAX_PTYPES 16
+static int
+ethdev_ptype_setup(uint16_t port, uint16_t queue)
+{
+	uint8_t l3_ipv4 = 0, l3_ipv6 = 0;
+	uint32_t ptypes[MAX_PTYPES];
+	int i, rc;
+
+	/* Check IPv4 & IPv6 ptype support */
+	rc = rte_eth_dev_get_supported_ptypes(port, RTE_PTYPE_L3_MASK, ptypes,
+					      MAX_PTYPES);
+	for (i = 0; i < rc; i++) {
+		if (ptypes[i] & RTE_PTYPE_L3_IPV4)
+			l3_ipv4 = 1;
+		if (ptypes[i] & RTE_PTYPE_L3_IPV6)
+			l3_ipv6 = 1;
+	}
+
+	if (!l3_ipv4 || !l3_ipv6) {
+		node_info("ethdev_rx",
+			  "Enabling ptype callback for required ptypes on port %u\n",
+			  port);
+
+		if (!rte_eth_add_rx_callback(port, queue, eth_pkt_parse_cb,
+					     NULL)) {
+			node_err("ethdev_rx",
+				 "Failed to add rx ptype cb: port=%d, queue=%d\n",
+				 port, queue);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static int
+ethdev_rx_node_init(const struct rte_graph *graph, struct rte_node *node)
+{
+	ethdev_rx_node_ctx_t *ctx = (ethdev_rx_node_ctx_t *)node->ctx;
+	ethdev_rx_node_elem_t *elem = ethdev_rx_main.head;
+
+	RTE_SET_USED(graph);
+
+	while (elem) {
+		if (elem->nid == node->id) {
+			/* Update node specific context */
+			memcpy(ctx, &elem->ctx, sizeof(ethdev_rx_node_ctx_t));
+			break;
+		}
+		elem = elem->next;
+	}
+
+	RTE_VERIFY(elem != NULL);
+
+	/* Check and setup ptype */
+	return ethdev_ptype_setup(ctx->port_id, ctx->queue_id);
+}
+
+struct ethdev_rx_node_main *
+ethdev_rx_get_node_data_get(void)
+{
+	return &ethdev_rx_main;
+}
+
+static struct rte_node_register ethdev_rx_node_base = {
+	.process = ethdev_rx_node_process,
+	.flags = RTE_NODE_SOURCE_F,
+	.name = "ethdev_rx",
+
+	.init = ethdev_rx_node_init,
+
+	.nb_edges = ETHDEV_RX_NEXT_MAX,
+	.next_nodes = {[ETHDEV_RX_NEXT_IP4_LOOKUP] = "ip4_lookup"},
+};
+
+struct rte_node_register *
+ethdev_rx_node_get(void)
+{
+	return &ethdev_rx_node_base;
+}
+
+RTE_NODE_REGISTER(ethdev_rx_node_base);
diff --git a/lib/librte_node/ethdev_rx_priv.h b/lib/librte_node/ethdev_rx_priv.h
new file mode 100644
index 000000000..2d7195a36
--- /dev/null
+++ b/lib/librte_node/ethdev_rx_priv.h
@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(C) 2020 Marvell International Ltd.
+ */
+#ifndef __INCLUDE_ETHDEV_RX_PRIV_H__
+#define __INCLUDE_ETHDEV_RX_PRIV_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rte_common.h>
+
+struct ethdev_rx_node_elem;
+struct ethdev_rx_node_ctx;
+typedef struct ethdev_rx_node_elem ethdev_rx_node_elem_t;
+typedef struct ethdev_rx_node_ctx ethdev_rx_node_ctx_t;
+
+/**
+ * @internal
+ *
+ * Ethernet device Rx node context structure.
+ */
+struct ethdev_rx_node_ctx {
+	uint16_t port_id;  /**< Port identifier of the Rx node. */
+	uint16_t queue_id; /**< Queue identifier of the Rx node. */
+};
+
+/**
+ * @internal
+ *
+ * Ethernet device Rx node list element structure.
+ */
+struct ethdev_rx_node_elem {
+	struct ethdev_rx_node_elem *next;
+	/**< Pointer to the next Rx node element. */
+	struct ethdev_rx_node_ctx ctx;
+	/**< Rx node context. */
+	rte_node_t nid;
+	/**< Node identifier of the Rx node. */
+};
+
+enum ethdev_rx_next_nodes {
+	ETHDEV_RX_NEXT_IP4_LOOKUP,
+	ETHDEV_RX_NEXT_MAX,
+};
+
+/**
+ * @internal
+ *
+ * Ethernet Rx node main structure.
+ */
+struct ethdev_rx_node_main {
+	ethdev_rx_node_elem_t *head;
+	/**< Pointer to the head Rx node element. */
+};
+
+/**
+ * @internal
+ *
+ * Get the Ethernet Rx node data.
+ *
+ * @return
+ *   Pointer to Ethernet Rx node data.
+ */
+struct ethdev_rx_node_main *ethdev_rx_get_node_data_get(void);
+
+/**
+ * @internal
+ *
+ * Get the Ethernet Rx node.
+ *
+ * @retrun
+ *   Pointer to the Ethernet Rx node.
+ */
+struct rte_node_register *ethdev_rx_node_get(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __INCLUDE_ETHDEV_RX_PRIV_H__ */
diff --git a/lib/librte_node/meson.build b/lib/librte_node/meson.build
index a97813ad4..94caa6c23 100644
--- a/lib/librte_node/meson.build
+++ b/lib/librte_node/meson.build
@@ -1,8 +1,8 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(C) 2020 Marvell International Ltd.
 
-sources = files('null.c', 'log.c')
+sources = files('null.c', 'log.c', 'ethdev_rx.c')
 allow_experimental_apis = true
 # Strict-aliasing rules are violated by uint8_t[] to context size casts.
 cflags += '-fno-strict-aliasing'
-deps += ['graph']
+deps += ['graph', 'ethdev']
-- 
2.25.1