net/sfc: add representors proxy infrastructure

Representor proxy is a mediator between virtual functions and port
representors. It forwards traffic between virtual functions and port
representors performing base PF ethdev + VF's representor traffic
(de-)multiplexing. The implementation will be provided by later patches.

Signed-off-by: Igor Romanov <igor.romanov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Reviewed-by: Andy Moreton <amoreton@xilinx.com>
Reviewed-by: Ivan Malov <ivan.malov@oktetlabs.ru>

drivers/net/sfc/meson.build

@@ -97,4 +97,5 @@ sources = files(
         'sfc_ef100_rx.c',
         'sfc_ef100_tx.c',
         'sfc_service.c',
+        'sfc_repr_proxy.c',
 )

drivers/net/sfc/sfc.c

@@ -27,6 +27,25 @@
 #include "sfc_sw_stats.h"
 
 
+bool
+sfc_repr_supported(const struct sfc_adapter *sa)
+{
+	if (!sa->switchdev)
+		return false;
+
+	/*
+	 * Representor proxy should use service lcore on PF's socket
+	 * (sa->socket_id) to be efficient. But the proxy will fall back
+	 * to any socket if it is not possible to get the service core
+	 * on the same socket. Check that at least service core on any
+	 * socket is available.
+	 */
+	if (sfc_get_service_lcore(SOCKET_ID_ANY) == RTE_MAX_LCORE)
+		return false;
+
+	return true;
+}
+
 int
 sfc_dma_alloc(const struct sfc_adapter *sa, const char *name, uint16_t id,
 	      size_t len, int socket_id, efsys_mem_t *esmp)
@@ -434,9 +453,16 @@ sfc_try_start(struct sfc_adapter *sa)
 	if (rc != 0)
 		goto fail_flows_insert;
 
+	rc = sfc_repr_proxy_start(sa);
+	if (rc != 0)
+		goto fail_repr_proxy_start;
+
 	sfc_log_init(sa, "done");
 	return 0;
 
+fail_repr_proxy_start:
+	sfc_flow_stop(sa);
+
 fail_flows_insert:
 	sfc_tx_stop(sa);
 
@@ -540,6 +566,7 @@ sfc_stop(struct sfc_adapter *sa)
 
 	sa->state = SFC_ADAPTER_STOPPING;
 
+	sfc_repr_proxy_stop(sa);
 	sfc_flow_stop(sa);
 	sfc_tx_stop(sa);
 	sfc_rx_stop(sa);
@@ -899,6 +926,10 @@ sfc_attach(struct sfc_adapter *sa)
 	if (rc != 0)
 		goto fail_mae_switchdev_init;
 
+	rc = sfc_repr_proxy_attach(sa);
+	if (rc != 0)
+		goto fail_repr_proxy_attach;
+
 	sfc_log_init(sa, "fini nic");
 	efx_nic_fini(enp);
 
@@ -927,6 +958,9 @@ sfc_attach(struct sfc_adapter *sa)
 
 fail_sw_xstats_init:
 	sfc_flow_fini(sa);
+	sfc_repr_proxy_detach(sa);
+
+fail_repr_proxy_attach:
 	sfc_mae_switchdev_fini(sa);
 
 fail_mae_switchdev_init:
@@ -976,6 +1010,7 @@ sfc_detach(struct sfc_adapter *sa)
 
 	sfc_flow_fini(sa);
 
+	sfc_repr_proxy_detach(sa);
 	sfc_mae_switchdev_fini(sa);
 	sfc_mae_detach(sa);
 	sfc_mae_counter_rxq_detach(sa);

drivers/net/sfc/sfc.h

@@ -31,6 +31,8 @@
 #include "sfc_mae.h"
 #include "sfc_dp.h"
 #include "sfc_sw_stats.h"
+#include "sfc_repr_proxy.h"
+#include "sfc_service.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -282,6 +284,7 @@ struct sfc_adapter {
 	struct sfc_sw_stats		sw_stats;
 	struct sfc_filter		filter;
 	struct sfc_mae			mae;
+	struct sfc_repr_proxy		repr_proxy;
 
 	struct sfc_flow_list		flow_list;
 
@@ -410,6 +413,8 @@ sfc_nb_counter_rxq(const struct sfc_adapter_shared *sas)
 	return sas->counters_rxq_allocated ? 1 : 0;
 }
 
+bool sfc_repr_supported(const struct sfc_adapter *sa);
+
 /** Get the number of milliseconds since boot from the default timer */
 static inline uint64_t
 sfc_get_system_msecs(void)

drivers/net/sfc/sfc_repr_proxy.c

@@ -0,0 +1,210 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright(c) 2019-2021 Xilinx, Inc.
+ * Copyright(c) 2019 Solarflare Communications Inc.
+ *
+ * This software was jointly developed between OKTET Labs (under contract
+ * for Solarflare) and Solarflare Communications, Inc.
+ */
+
+#include <rte_service.h>
+#include <rte_service_component.h>
+
+#include "sfc_log.h"
+#include "sfc_service.h"
+#include "sfc_repr_proxy.h"
+#include "sfc.h"
+
+static int32_t
+sfc_repr_proxy_routine(void *arg)
+{
+	struct sfc_repr_proxy *rp = arg;
+
+	/* Representor proxy boilerplate will be here */
+	RTE_SET_USED(rp);
+
+	return 0;
+}
+
+int
+sfc_repr_proxy_attach(struct sfc_adapter *sa)
+{
+	struct sfc_repr_proxy *rp = &sa->repr_proxy;
+	struct rte_service_spec service;
+	uint32_t cid;
+	uint32_t sid;
+	int rc;
+
+	sfc_log_init(sa, "entry");
+
+	if (!sfc_repr_supported(sa)) {
+		sfc_log_init(sa, "representors not supported - skip");
+		return 0;
+	}
+
+	cid = sfc_get_service_lcore(sa->socket_id);
+	if (cid == RTE_MAX_LCORE && sa->socket_id != SOCKET_ID_ANY) {
+		/* Warn and try to allocate on any NUMA node */
+		sfc_warn(sa,
+			"repr proxy: unable to get service lcore at socket %d",
+			sa->socket_id);
+
+		cid = sfc_get_service_lcore(SOCKET_ID_ANY);
+	}
+	if (cid == RTE_MAX_LCORE) {
+		rc = ENOTSUP;
+		sfc_err(sa, "repr proxy: failed to get service lcore");
+		goto fail_get_service_lcore;
+	}
+
+	memset(&service, 0, sizeof(service));
+	snprintf(service.name, sizeof(service.name),
+		 "net_sfc_%hu_repr_proxy", sfc_sa2shared(sa)->port_id);
+	service.socket_id = rte_lcore_to_socket_id(cid);
+	service.callback = sfc_repr_proxy_routine;
+	service.callback_userdata = rp;
+
+	rc = rte_service_component_register(&service, &sid);
+	if (rc != 0) {
+		rc = ENOEXEC;
+		sfc_err(sa, "repr proxy: failed to register service component");
+		goto fail_register;
+	}
+
+	rc = rte_service_map_lcore_set(sid, cid, 1);
+	if (rc != 0) {
+		rc = -rc;
+		sfc_err(sa, "repr proxy: failed to map lcore");
+		goto fail_map_lcore;
+	}
+
+	rp->service_core_id = cid;
+	rp->service_id = sid;
+
+	sfc_log_init(sa, "done");
+
+	return 0;
+
+fail_map_lcore:
+	rte_service_component_unregister(sid);
+
+fail_register:
+	/*
+	 * No need to rollback service lcore get since
+	 * it just makes socket_id based search and remembers it.
+	 */
+
+fail_get_service_lcore:
+	sfc_log_init(sa, "failed: %s", rte_strerror(rc));
+	return rc;
+}
+
+void
+sfc_repr_proxy_detach(struct sfc_adapter *sa)
+{
+	struct sfc_repr_proxy *rp = &sa->repr_proxy;
+
+	sfc_log_init(sa, "entry");
+
+	if (!sfc_repr_supported(sa)) {
+		sfc_log_init(sa, "representors not supported - skip");
+		return;
+	}
+
+	rte_service_map_lcore_set(rp->service_id, rp->service_core_id, 0);
+	rte_service_component_unregister(rp->service_id);
+
+	sfc_log_init(sa, "done");
+}
+
+int
+sfc_repr_proxy_start(struct sfc_adapter *sa)
+{
+	struct sfc_repr_proxy *rp = &sa->repr_proxy;
+	int rc;
+
+	sfc_log_init(sa, "entry");
+
+	/*
+	 * The condition to start the proxy is insufficient. It will be
+	 * complemented with representor port start/stop support.
+	 */
+	if (!sfc_repr_supported(sa)) {
+		sfc_log_init(sa, "representors not supported - skip");
+		return 0;
+	}
+
+	/* Service core may be in "stopped" state, start it */
+	rc = rte_service_lcore_start(rp->service_core_id);
+	if (rc != 0 && rc != -EALREADY) {
+		rc = -rc;
+		sfc_err(sa, "failed to start service core for %s: %s",
+			rte_service_get_name(rp->service_id),
+			rte_strerror(rc));
+		goto fail_start_core;
+	}
+
+	/* Run the service */
+	rc = rte_service_component_runstate_set(rp->service_id, 1);
+	if (rc < 0) {
+		rc = -rc;
+		sfc_err(sa, "failed to run %s component: %s",
+			rte_service_get_name(rp->service_id),
+			rte_strerror(rc));
+		goto fail_component_runstate_set;
+	}
+	rc = rte_service_runstate_set(rp->service_id, 1);
+	if (rc < 0) {
+		rc = -rc;
+		sfc_err(sa, "failed to run %s: %s",
+			rte_service_get_name(rp->service_id),
+			rte_strerror(rc));
+		goto fail_runstate_set;
+	}
+
+	sfc_log_init(sa, "done");
+
+	return 0;
+
+fail_runstate_set:
+	rte_service_component_runstate_set(rp->service_id, 0);
+
+fail_component_runstate_set:
+	/* Service lcore may be shared and we never stop it */
+
+fail_start_core:
+	sfc_log_init(sa, "failed: %s", rte_strerror(rc));
+	return rc;
+}
+
+void
+sfc_repr_proxy_stop(struct sfc_adapter *sa)
+{
+	struct sfc_repr_proxy *rp = &sa->repr_proxy;
+	int rc;
+
+	sfc_log_init(sa, "entry");
+
+	if (!sfc_repr_supported(sa)) {
+		sfc_log_init(sa, "representors not supported - skip");
+		return;
+	}
+
+	rc = rte_service_runstate_set(rp->service_id, 0);
+	if (rc < 0) {
+		sfc_err(sa, "failed to stop %s: %s",
+			rte_service_get_name(rp->service_id),
+			rte_strerror(-rc));
+	}
+
+	rc = rte_service_component_runstate_set(rp->service_id, 0);
+	if (rc < 0) {
+		sfc_err(sa, "failed to stop %s component: %s",
+			rte_service_get_name(rp->service_id),
+			rte_strerror(-rc));
+	}
+
+	/* Service lcore may be shared and we never stop it */
+
+	sfc_log_init(sa, "done");
+}

drivers/net/sfc/sfc_repr_proxy.h

@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright(c) 2019-2021 Xilinx, Inc.
+ * Copyright(c) 2019 Solarflare Communications Inc.
+ *
+ * This software was jointly developed between OKTET Labs (under contract
+ * for Solarflare) and Solarflare Communications, Inc.
+ */
+
+#ifndef _SFC_REPR_PROXY_H
+#define _SFC_REPR_PROXY_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct sfc_repr_proxy {
+	uint32_t			service_core_id;
+	uint32_t			service_id;
+};
+
+struct sfc_adapter;
+
+int sfc_repr_proxy_attach(struct sfc_adapter *sa);
+void sfc_repr_proxy_detach(struct sfc_adapter *sa);
+int sfc_repr_proxy_start(struct sfc_adapter *sa);
+void sfc_repr_proxy_stop(struct sfc_adapter *sa);
+
+#ifdef __cplusplus
+}
+#endif
+#endif  /* _SFC_REPR_PROXY_H */