[dpdk-dev] [PATCH 08/38] net/sfc: reserve TxQ and RxQ for port representors

[Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>]

From: Igor Romanov <igor.romanov@oktetlabs.ru>

A Tx/Rx queue pair is required to forward traffic between
port representors and virtual functions.

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/sfc.c            | 51 ++++++++++++++++++++++++++++++--
 drivers/net/sfc/sfc.h            | 15 ++++++++++
 drivers/net/sfc/sfc_ev.h         | 40 ++++++++++++++++++-------
 drivers/net/sfc/sfc_repr_proxy.c | 12 +++++---
 drivers/net/sfc/sfc_repr_proxy.h |  8 +++++
 drivers/net/sfc/sfc_tx.c         | 29 ++++++++++--------
 6 files changed, 124 insertions(+), 31 deletions(-)

diff --git a/drivers/net/sfc/sfc.c b/drivers/net/sfc/sfc.c
index 591b8971b3..9abd6d600b 100644
--- a/drivers/net/sfc/sfc.c
+++ b/drivers/net/sfc/sfc.c
@@ -46,6 +46,12 @@ sfc_repr_supported(const struct sfc_adapter *sa)
 	return true;
 }
 
+bool
+sfc_repr_available(const struct sfc_adapter_shared *sas)
+{
+	return sas->nb_repr_rxq > 0 && sas->nb_repr_txq > 0;
+}
+
 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)
@@ -296,6 +302,41 @@ sfc_estimate_resource_limits(struct sfc_adapter *sa)
 		sas->counters_rxq_allocated = false;
 	}
 
+	if (sfc_repr_supported(sa) &&
+	    evq_allocated >= SFC_REPR_PROXY_NB_RXQ_MIN +
+	    SFC_REPR_PROXY_NB_TXQ_MIN &&
+	    rxq_allocated >= SFC_REPR_PROXY_NB_RXQ_MIN &&
+	    txq_allocated >= SFC_REPR_PROXY_NB_TXQ_MIN) {
+		unsigned int extra;
+
+		txq_allocated -= SFC_REPR_PROXY_NB_TXQ_MIN;
+		rxq_allocated -= SFC_REPR_PROXY_NB_RXQ_MIN;
+		evq_allocated -= SFC_REPR_PROXY_NB_RXQ_MIN +
+			SFC_REPR_PROXY_NB_TXQ_MIN;
+
+		sas->nb_repr_rxq = SFC_REPR_PROXY_NB_RXQ_MIN;
+		sas->nb_repr_txq = SFC_REPR_PROXY_NB_TXQ_MIN;
+
+		/* Allocate extra representor RxQs up to the maximum */
+		extra = MIN(evq_allocated, rxq_allocated);
+		extra = MIN(extra,
+			    SFC_REPR_PROXY_NB_RXQ_MAX - sas->nb_repr_rxq);
+		evq_allocated -= extra;
+		rxq_allocated -= extra;
+		sas->nb_repr_rxq += extra;
+
+		/* Allocate extra representor TxQs up to the maximum */
+		extra = MIN(evq_allocated, txq_allocated);
+		extra = MIN(extra,
+			    SFC_REPR_PROXY_NB_TXQ_MAX - sas->nb_repr_txq);
+		evq_allocated -= extra;
+		txq_allocated -= extra;
+		sas->nb_repr_txq += extra;
+	} else {
+		sas->nb_repr_rxq = 0;
+		sas->nb_repr_txq = 0;
+	}
+
 	/* Add remaining allocated queues */
 	sa->rxq_max += MIN(rxq_allocated, evq_allocated / 2);
 	sa->txq_max += MIN(txq_allocated, evq_allocated - sa->rxq_max);
@@ -313,8 +354,10 @@ sfc_estimate_resource_limits(struct sfc_adapter *sa)
 static int
 sfc_set_drv_limits(struct sfc_adapter *sa)
 {
+	struct sfc_adapter_shared *sas = sfc_sa2shared(sa);
 	const struct rte_eth_dev_data *data = sa->eth_dev->data;
-	uint32_t rxq_reserved = sfc_nb_reserved_rxq(sfc_sa2shared(sa));
+	uint32_t rxq_reserved = sfc_nb_reserved_rxq(sas);
+	uint32_t txq_reserved = sfc_nb_txq_reserved(sas);
 	efx_drv_limits_t lim;
 
 	memset(&lim, 0, sizeof(lim));
@@ -325,10 +368,12 @@ sfc_set_drv_limits(struct sfc_adapter *sa)
 	 * sfc_estimate_resource_limits().
 	 */
 	lim.edl_min_evq_count = lim.edl_max_evq_count =
-		1 + data->nb_rx_queues + data->nb_tx_queues + rxq_reserved;
+		1 + data->nb_rx_queues + data->nb_tx_queues +
+		rxq_reserved + txq_reserved;
 	lim.edl_min_rxq_count = lim.edl_max_rxq_count =
 		data->nb_rx_queues + rxq_reserved;
-	lim.edl_min_txq_count = lim.edl_max_txq_count = data->nb_tx_queues;
+	lim.edl_min_txq_count = lim.edl_max_txq_count =
+		data->nb_tx_queues + txq_reserved;
 
 	return efx_nic_set_drv_limits(sa->nic, &lim);
 }
diff --git a/drivers/net/sfc/sfc.h b/drivers/net/sfc/sfc.h
index 8f65857f65..79f9d7979e 100644
--- a/drivers/net/sfc/sfc.h
+++ b/drivers/net/sfc/sfc.h
@@ -191,6 +191,8 @@ struct sfc_adapter_shared {
 	char				*dp_tx_name;
 
 	bool				counters_rxq_allocated;
+	unsigned int			nb_repr_rxq;
+	unsigned int			nb_repr_txq;
 };
 
 /* Adapter process private data */
@@ -392,6 +394,19 @@ sfc_nb_counter_rxq(const struct sfc_adapter_shared *sas)
 }
 
 bool sfc_repr_supported(const struct sfc_adapter *sa);
+bool sfc_repr_available(const struct sfc_adapter_shared *sas);
+
+static inline unsigned int
+sfc_repr_nb_rxq(const struct sfc_adapter_shared *sas)
+{
+	return sas->nb_repr_rxq;
+}
+
+static inline unsigned int
+sfc_repr_nb_txq(const struct sfc_adapter_shared *sas)
+{
+	return sas->nb_repr_txq;
+}
 
 /** Get the number of milliseconds since boot from the default timer */
 static inline uint64_t
diff --git a/drivers/net/sfc/sfc_ev.h b/drivers/net/sfc/sfc_ev.h
index b2a0380205..590cfb1694 100644
--- a/drivers/net/sfc/sfc_ev.h
+++ b/drivers/net/sfc/sfc_ev.h
@@ -70,14 +70,21 @@ sfc_mgmt_evq_sw_index(__rte_unused const struct sfc_adapter_shared *sas)
 static inline unsigned int
 sfc_nb_reserved_rxq(const struct sfc_adapter_shared *sas)
 {
-	return sfc_nb_counter_rxq(sas);
+	return sfc_nb_counter_rxq(sas) + sfc_repr_nb_rxq(sas);
+}
+
+/* Return the number of Tx queues reserved for driver's internal use */
+static inline unsigned int
+sfc_nb_txq_reserved(const struct sfc_adapter_shared *sas)
+{
+	return sfc_repr_nb_txq(sas);
 }
 
 static inline unsigned int
 sfc_nb_reserved_evq(const struct sfc_adapter_shared *sas)
 {
-	/* An EvQ is required for each reserved RxQ */
-	return 1 + sfc_nb_reserved_rxq(sas);
+	/* An EvQ is required for each reserved Rx/Tx queue */
+	return 1 + sfc_nb_reserved_rxq(sas) + sfc_nb_txq_reserved(sas);
 }
 
 /*
@@ -112,6 +119,7 @@ sfc_counters_rxq_sw_index(const struct sfc_adapter_shared *sas)
  * Own event queue is allocated for management, each Rx and each Tx queue.
  * Zero event queue is used for management events.
  * When counters are supported, one Rx event queue is reserved.
+ * When representors are supported, Rx and Tx event queues are reserved.
  * Rx event queues follow reserved event queues.
  * Tx event queues follow Rx event queues.
  */
@@ -150,27 +158,37 @@ sfc_evq_sw_index_by_rxq_sw_index(struct sfc_adapter *sa,
 }
 
 static inline sfc_ethdev_qid_t
-sfc_ethdev_tx_qid_by_txq_sw_index(__rte_unused struct sfc_adapter_shared *sas,
+sfc_ethdev_tx_qid_by_txq_sw_index(struct sfc_adapter_shared *sas,
 				  sfc_sw_index_t txq_sw_index)
 {
-	/* Only ethdev queues are present for now */
-	return txq_sw_index;
+	if (txq_sw_index < sfc_nb_txq_reserved(sas))
+		return SFC_ETHDEV_QID_INVALID;
+
+	return txq_sw_index - sfc_nb_txq_reserved(sas);
 }
 
 static inline sfc_sw_index_t
-sfc_txq_sw_index_by_ethdev_tx_qid(__rte_unused struct sfc_adapter_shared *sas,
+sfc_txq_sw_index_by_ethdev_tx_qid(struct sfc_adapter_shared *sas,
 				  sfc_ethdev_qid_t ethdev_qid)
 {
-	/* Only ethdev queues are present for now */
-	return ethdev_qid;
+	return sfc_nb_txq_reserved(sas) + ethdev_qid;
 }
 
 static inline sfc_sw_index_t
 sfc_evq_sw_index_by_txq_sw_index(struct sfc_adapter *sa,
 				 sfc_sw_index_t txq_sw_index)
 {
-	return sfc_nb_reserved_evq(sfc_sa2shared(sa)) +
-		sa->eth_dev->data->nb_rx_queues + txq_sw_index;
+	struct sfc_adapter_shared *sas = sfc_sa2shared(sa);
+	sfc_ethdev_qid_t ethdev_qid;
+
+	ethdev_qid = sfc_ethdev_tx_qid_by_txq_sw_index(sas, txq_sw_index);
+	if (ethdev_qid == SFC_ETHDEV_QID_INVALID) {
+		return sfc_nb_reserved_evq(sas) - sfc_nb_txq_reserved(sas) +
+			txq_sw_index;
+	}
+
+	return sfc_nb_reserved_evq(sas) + sa->eth_dev->data->nb_rx_queues +
+		ethdev_qid;
 }
 
 int sfc_ev_attach(struct sfc_adapter *sa);
diff --git a/drivers/net/sfc/sfc_repr_proxy.c b/drivers/net/sfc/sfc_repr_proxy.c
index eb29376988..6d3962304f 100644
--- a/drivers/net/sfc/sfc_repr_proxy.c
+++ b/drivers/net/sfc/sfc_repr_proxy.c
@@ -29,6 +29,7 @@ sfc_repr_proxy_routine(void *arg)
 int
 sfc_repr_proxy_attach(struct sfc_adapter *sa)
 {
+	struct sfc_adapter_shared * const sas = sfc_sa2shared(sa);
 	struct sfc_repr_proxy *rp = &sa->repr_proxy;
 	struct rte_service_spec service;
 	uint32_t cid;
@@ -37,7 +38,7 @@ sfc_repr_proxy_attach(struct sfc_adapter *sa)
 
 	sfc_log_init(sa, "entry");
 
-	if (!sfc_repr_supported(sa)) {
+	if (!sfc_repr_available(sas)) {
 		sfc_log_init(sa, "representors not supported - skip");
 		return 0;
 	}
@@ -102,11 +103,12 @@ sfc_repr_proxy_attach(struct sfc_adapter *sa)
 void
 sfc_repr_proxy_detach(struct sfc_adapter *sa)
 {
+	struct sfc_adapter_shared * const sas = sfc_sa2shared(sa);
 	struct sfc_repr_proxy *rp = &sa->repr_proxy;
 
 	sfc_log_init(sa, "entry");
 
-	if (!sfc_repr_supported(sa)) {
+	if (!sfc_repr_available(sas)) {
 		sfc_log_init(sa, "representors not supported - skip");
 		return;
 	}
@@ -120,6 +122,7 @@ sfc_repr_proxy_detach(struct sfc_adapter *sa)
 int
 sfc_repr_proxy_start(struct sfc_adapter *sa)
 {
+	struct sfc_adapter_shared * const sas = sfc_sa2shared(sa);
 	struct sfc_repr_proxy *rp = &sa->repr_proxy;
 	int rc;
 
@@ -129,7 +132,7 @@ sfc_repr_proxy_start(struct sfc_adapter *sa)
 	 * The condition to start the proxy is insufficient. It will be
 	 * complemented with representor port start/stop support.
 	 */
-	if (!sfc_repr_supported(sa)) {
+	if (!sfc_repr_available(sas)) {
 		sfc_log_init(sa, "representors not supported - skip");
 		return 0;
 	}
@@ -180,12 +183,13 @@ sfc_repr_proxy_start(struct sfc_adapter *sa)
 void
 sfc_repr_proxy_stop(struct sfc_adapter *sa)
 {
+	struct sfc_adapter_shared * const sas = sfc_sa2shared(sa);
 	struct sfc_repr_proxy *rp = &sa->repr_proxy;
 	int rc;
 
 	sfc_log_init(sa, "entry");
 
-	if (!sfc_repr_supported(sa)) {
+	if (!sfc_repr_available(sas)) {
 		sfc_log_init(sa, "representors not supported - skip");
 		return;
 	}
diff --git a/drivers/net/sfc/sfc_repr_proxy.h b/drivers/net/sfc/sfc_repr_proxy.h
index 40ce352335..953b9922c8 100644
--- a/drivers/net/sfc/sfc_repr_proxy.h
+++ b/drivers/net/sfc/sfc_repr_proxy.h
@@ -16,6 +16,14 @@
 extern "C" {
 #endif
 
+/* Number of supported RxQs with different mbuf memory pools */
+#define SFC_REPR_PROXY_NB_RXQ_MIN	(1)
+#define SFC_REPR_PROXY_NB_RXQ_MAX	(1)
+
+/* One TxQ is required and sufficient for port representors support */
+#define SFC_REPR_PROXY_NB_TXQ_MIN	(1)
+#define SFC_REPR_PROXY_NB_TXQ_MAX	(1)
+
 struct sfc_repr_proxy {
 	uint32_t			service_core_id;
 	uint32_t			service_id;
diff --git a/drivers/net/sfc/sfc_tx.c b/drivers/net/sfc/sfc_tx.c
index 49b239f4d2..c1b2e964f8 100644
--- a/drivers/net/sfc/sfc_tx.c
+++ b/drivers/net/sfc/sfc_tx.c
@@ -376,6 +376,8 @@ sfc_tx_configure(struct sfc_adapter *sa)
 	const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
 	const struct rte_eth_conf *dev_conf = &sa->eth_dev->data->dev_conf;
 	const unsigned int nb_tx_queues = sa->eth_dev->data->nb_tx_queues;
+	const unsigned int nb_rsvd_tx_queues = sfc_nb_txq_reserved(sas);
+	const unsigned int nb_txq_total = nb_tx_queues + nb_rsvd_tx_queues;
 	int rc = 0;
 
 	sfc_log_init(sa, "nb_tx_queues=%u (old %u)",
@@ -395,11 +397,11 @@ sfc_tx_configure(struct sfc_adapter *sa)
 	if (rc != 0)
 		goto fail_check_mode;
 
-	if (nb_tx_queues == sas->txq_count)
+	if (nb_txq_total == sas->txq_count)
 		goto done;
 
 	if (sas->txq_info == NULL) {
-		sas->txq_info = rte_calloc_socket("sfc-txqs", nb_tx_queues,
+		sas->txq_info = rte_calloc_socket("sfc-txqs", nb_txq_total,
 						  sizeof(sas->txq_info[0]), 0,
 						  sa->socket_id);
 		if (sas->txq_info == NULL)
@@ -410,7 +412,7 @@ sfc_tx_configure(struct sfc_adapter *sa)
 		 * since it should not be shared.
 		 */
 		rc = ENOMEM;
-		sa->txq_ctrl = calloc(nb_tx_queues, sizeof(sa->txq_ctrl[0]));
+		sa->txq_ctrl = calloc(nb_txq_total, sizeof(sa->txq_ctrl[0]));
 		if (sa->txq_ctrl == NULL)
 			goto fail_txqs_ctrl_alloc;
 	} else {
@@ -422,23 +424,23 @@ sfc_tx_configure(struct sfc_adapter *sa)
 
 		new_txq_info =
 			rte_realloc(sas->txq_info,
-				    nb_tx_queues * sizeof(sas->txq_info[0]), 0);
-		if (new_txq_info == NULL && nb_tx_queues > 0)
+				    nb_txq_total * sizeof(sas->txq_info[0]), 0);
+		if (new_txq_info == NULL && nb_txq_total > 0)
 			goto fail_txqs_realloc;
 
 		new_txq_ctrl = realloc(sa->txq_ctrl,
-				       nb_tx_queues * sizeof(sa->txq_ctrl[0]));
-		if (new_txq_ctrl == NULL && nb_tx_queues > 0)
+				       nb_txq_total * sizeof(sa->txq_ctrl[0]));
+		if (new_txq_ctrl == NULL && nb_txq_total > 0)
 			goto fail_txqs_ctrl_realloc;
 
 		sas->txq_info = new_txq_info;
 		sa->txq_ctrl = new_txq_ctrl;
-		if (nb_tx_queues > sas->ethdev_txq_count) {
-			memset(&sas->txq_info[sas->ethdev_txq_count], 0,
-			       (nb_tx_queues - sas->ethdev_txq_count) *
+		if (nb_txq_total > sas->txq_count) {
+			memset(&sas->txq_info[sas->txq_count], 0,
+			       (nb_txq_total - sas->txq_count) *
 			       sizeof(sas->txq_info[0]));
-			memset(&sa->txq_ctrl[sas->ethdev_txq_count], 0,
-			       (nb_tx_queues - sas->ethdev_txq_count) *
+			memset(&sa->txq_ctrl[sas->txq_count], 0,
+			       (nb_txq_total - sas->txq_count) *
 			       sizeof(sa->txq_ctrl[0]));
 		}
 	}
@@ -455,7 +457,8 @@ sfc_tx_configure(struct sfc_adapter *sa)
 		sas->ethdev_txq_count++;
 	}
 
-	sas->txq_count = sas->ethdev_txq_count;
+	/* TODO: initialize reserved queues when supported. */
+	sas->txq_count = sas->ethdev_txq_count + nb_rsvd_tx_queues;
 
 done:
 	return 0;
-- 
2.30.2