[dpdk-dev] [PATCH v2 29/57] net/octeontx2: add flow control support

[<jerinj@marvell.com>]

From: Vamsi Attunuru <vattunuru@marvell.com>

Add flow control operations and exposed
otx2_nix_update_flow_ctrl_mode() to enable on the
configured mode in dev_start().

Signed-off-by: Vamsi Attunuru <vattunuru@marvell.com>
Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
---
 doc/guides/nics/features/octeontx2.ini     |   1 +
 doc/guides/nics/features/octeontx2_vec.ini |   1 +
 doc/guides/nics/octeontx2.rst              |   1 +
 drivers/net/octeontx2/Makefile             |   1 +
 drivers/net/octeontx2/meson.build          |   1 +
 drivers/net/octeontx2/otx2_ethdev.c        |  20 ++
 drivers/net/octeontx2/otx2_ethdev.h        |  23 +++
 drivers/net/octeontx2/otx2_flow_ctrl.c     | 220 +++++++++++++++++++++
 8 files changed, 268 insertions(+)
 create mode 100644 drivers/net/octeontx2/otx2_flow_ctrl.c

diff --git a/doc/guides/nics/features/octeontx2.ini b/doc/guides/nics/features/octeontx2.ini
index 87141244a..00feb0cf2 100644
--- a/doc/guides/nics/features/octeontx2.ini
+++ b/doc/guides/nics/features/octeontx2.ini
@@ -21,6 +21,7 @@ RSS hash             = Y
 RSS key update       = Y
 RSS reta update      = Y
 Inner RSS            = Y
+Flow control         = Y
 Packet type parsing  = Y
 Rx descriptor status = Y
 Basic stats          = Y
diff --git a/doc/guides/nics/features/octeontx2_vec.ini b/doc/guides/nics/features/octeontx2_vec.ini
index dafbe003c..f3f812804 100644
--- a/doc/guides/nics/features/octeontx2_vec.ini
+++ b/doc/guides/nics/features/octeontx2_vec.ini
@@ -21,6 +21,7 @@ RSS hash             = Y
 RSS key update       = Y
 RSS reta update      = Y
 Inner RSS            = Y
+Flow control         = Y
 Packet type parsing  = Y
 Rx descriptor status = Y
 Basic stats          = Y
diff --git a/doc/guides/nics/octeontx2.rst b/doc/guides/nics/octeontx2.rst
index 07e44b031..20281b030 100644
--- a/doc/guides/nics/octeontx2.rst
+++ b/doc/guides/nics/octeontx2.rst
@@ -25,6 +25,7 @@ Features of the OCTEON TX2 Ethdev PMD are:
 - MAC filtering
 - Port hardware statistics
 - Link state information
+- Link flow control
 - Debug utilities - Context dump and error interrupt support
 
 Prerequisites
diff --git a/drivers/net/octeontx2/Makefile b/drivers/net/octeontx2/Makefile
index d434b0b9d..4a361846f 100644
--- a/drivers/net/octeontx2/Makefile
+++ b/drivers/net/octeontx2/Makefile
@@ -35,6 +35,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_OCTEONTX2_PMD) += \
 	otx2_stats.c	\
 	otx2_lookup.c	\
 	otx2_ethdev.c	\
+	otx2_flow_ctrl.c \
 	otx2_ethdev_irq.c \
 	otx2_ethdev_ops.c \
 	otx2_ethdev_debug.c \
diff --git a/drivers/net/octeontx2/meson.build b/drivers/net/octeontx2/meson.build
index 3dff3e53d..4b56f4461 100644
--- a/drivers/net/octeontx2/meson.build
+++ b/drivers/net/octeontx2/meson.build
@@ -10,6 +10,7 @@ sources = files(
 		'otx2_stats.c',
 		'otx2_lookup.c',
 		'otx2_ethdev.c',
+		'otx2_flow_ctrl.c',
 		'otx2_ethdev_irq.c',
 		'otx2_ethdev_ops.c',
 		'otx2_ethdev_debug.c',
diff --git a/drivers/net/octeontx2/otx2_ethdev.c b/drivers/net/octeontx2/otx2_ethdev.c
index 58c2f97b5..19b502903 100644
--- a/drivers/net/octeontx2/otx2_ethdev.c
+++ b/drivers/net/octeontx2/otx2_ethdev.c
@@ -216,6 +216,14 @@ nix_cq_rq_init(struct rte_eth_dev *eth_dev, struct otx2_eth_dev *dev,
 	aq->cq.cq_err_int_ena = BIT(NIX_CQERRINT_CQE_FAULT);
 	aq->cq.cq_err_int_ena |= BIT(NIX_CQERRINT_DOOR_ERR);
 
+	/* TX pause frames enable flowctrl on RX side */
+	if (dev->fc_info.tx_pause) {
+		/* Single bpid is allocated for all rx channels for now */
+		aq->cq.bpid = dev->fc_info.bpid[0];
+		aq->cq.bp = NIX_CQ_BP_LEVEL;
+		aq->cq.bp_ena = 1;
+	}
+
 	/* Many to one reduction */
 	aq->cq.qint_idx = qid % dev->qints;
 
@@ -1073,6 +1081,7 @@ otx2_nix_configure(struct rte_eth_dev *eth_dev)
 
 	/* Free the resources allocated from the previous configure */
 	if (dev->configured == 1) {
+		otx2_nix_rxchan_bpid_cfg(eth_dev, false);
 		oxt2_nix_unregister_queue_irqs(eth_dev);
 		nix_set_nop_rxtx_function(eth_dev);
 		rc = nix_store_queue_cfg_and_then_release(eth_dev);
@@ -1126,6 +1135,12 @@ otx2_nix_configure(struct rte_eth_dev *eth_dev)
 		goto free_nix_lf;
 	}
 
+	rc = otx2_nix_rxchan_bpid_cfg(eth_dev, true);
+	if (rc) {
+		otx2_err("Failed to configure nix rx chan bpid cfg rc=%d", rc);
+		goto free_nix_lf;
+	}
+
 	/*
 	 * Restore queue config when reconfigure followed by
 	 * reconfigure and no queue configure invoked from application case.
@@ -1302,6 +1317,8 @@ static const struct eth_dev_ops otx2_eth_dev_ops = {
 	.pool_ops_supported       = otx2_nix_pool_ops_supported,
 	.get_module_info          = otx2_nix_get_module_info,
 	.get_module_eeprom        = otx2_nix_get_module_eeprom,
+	.flow_ctrl_get            = otx2_nix_flow_ctrl_get,
+	.flow_ctrl_set            = otx2_nix_flow_ctrl_set,
 };
 
 static inline int
@@ -1503,6 +1520,9 @@ otx2_eth_dev_uninit(struct rte_eth_dev *eth_dev, bool mbox_close)
 	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
 		return 0;
 
+	/* Disable nix bpid config */
+	otx2_nix_rxchan_bpid_cfg(eth_dev, false);
+
 	/* Free up SQs */
 	for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
 		otx2_nix_tx_queue_release(eth_dev->data->tx_queues[i]);
diff --git a/drivers/net/octeontx2/otx2_ethdev.h b/drivers/net/octeontx2/otx2_ethdev.h
index 5dd5d8c8b..03ecd32ec 100644
--- a/drivers/net/octeontx2/otx2_ethdev.h
+++ b/drivers/net/octeontx2/otx2_ethdev.h
@@ -87,6 +87,9 @@
 #define NIX_TX_NB_SEG_MAX		9
 #endif
 
+/* Apply BP when CQ is 75% full */
+#define NIX_CQ_BP_LEVEL (25 * 256 / 100)
+
 #define CQ_OP_STAT_OP_ERR	63
 #define CQ_OP_STAT_CQ_ERR	46
 
@@ -169,6 +172,14 @@ struct otx2_npc_flow_info {
 	uint16_t flow_max_priority;
 };
 
+struct otx2_fc_info {
+	enum rte_eth_fc_mode mode;  /**< Link flow control mode */
+	uint8_t rx_pause;
+	uint8_t tx_pause;
+	uint8_t chan_cnt;
+	uint16_t bpid[NIX_MAX_CHAN];
+};
+
 struct otx2_eth_dev {
 	OTX2_DEV; /* Base class */
 	MARKER otx2_eth_dev_data_start;
@@ -216,6 +227,7 @@ struct otx2_eth_dev {
 	struct otx2_nix_tm_node_list node_list;
 	struct otx2_nix_tm_shaper_profile_list shaper_profile_list;
 	struct otx2_rss_info rss_info;
+	struct otx2_fc_info fc_info;
 	uint32_t txmap[RTE_ETHDEV_QUEUE_STAT_CNTRS];
 	uint32_t rxmap[RTE_ETHDEV_QUEUE_STAT_CNTRS];
 	struct otx2_npc_flow_info npc_flow;
@@ -368,6 +380,17 @@ int otx2_cgx_rxtx_stop(struct otx2_eth_dev *dev);
 int otx2_cgx_mac_addr_set(struct rte_eth_dev *eth_dev,
 			  struct rte_ether_addr *addr);
 
+/* Flow Control */
+int otx2_nix_flow_ctrl_get(struct rte_eth_dev *eth_dev,
+			   struct rte_eth_fc_conf *fc_conf);
+
+int otx2_nix_flow_ctrl_set(struct rte_eth_dev *eth_dev,
+			   struct rte_eth_fc_conf *fc_conf);
+
+int otx2_nix_rxchan_bpid_cfg(struct rte_eth_dev *eth_dev, bool enb);
+
+int otx2_nix_update_flow_ctrl_mode(struct rte_eth_dev *eth_dev);
+
 /* Lookup configuration */
 void *otx2_nix_fastpath_lookup_mem_get(void);
 
diff --git a/drivers/net/octeontx2/otx2_flow_ctrl.c b/drivers/net/octeontx2/otx2_flow_ctrl.c
new file mode 100644
index 000000000..0392086d8
--- /dev/null
+++ b/drivers/net/octeontx2/otx2_flow_ctrl.c
@@ -0,0 +1,220 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(C) 2019 Marvell International Ltd.
+ */
+
+#include "otx2_ethdev.h"
+
+int
+otx2_nix_rxchan_bpid_cfg(struct rte_eth_dev *eth_dev, bool enb)
+{
+	struct otx2_eth_dev *dev = otx2_eth_pmd_priv(eth_dev);
+	struct otx2_fc_info *fc = &dev->fc_info;
+	struct otx2_mbox *mbox = dev->mbox;
+	struct nix_bp_cfg_req *req;
+	struct nix_bp_cfg_rsp *rsp;
+	int rc;
+
+	if (otx2_dev_is_vf(dev))
+		return 0;
+
+	if (enb) {
+		req = otx2_mbox_alloc_msg_nix_bp_enable(mbox);
+		req->chan_base = 0;
+		req->chan_cnt = 1;
+		req->bpid_per_chan = 0;
+
+		rc = otx2_mbox_process_msg(mbox, (void *)&rsp);
+		if (rc || req->chan_cnt != rsp->chan_cnt) {
+			otx2_err("Insufficient BPIDs, alloc=%u < req=%u rc=%d",
+				 rsp->chan_cnt, req->chan_cnt, rc);
+			return rc;
+		}
+
+		fc->bpid[0] = rsp->chan_bpid[0];
+	} else {
+		req = otx2_mbox_alloc_msg_nix_bp_disable(mbox);
+		req->chan_base = 0;
+		req->chan_cnt = 1;
+
+		rc = otx2_mbox_process(mbox);
+
+		memset(fc->bpid, 0, sizeof(uint16_t) * NIX_MAX_CHAN);
+	}
+
+	return rc;
+}
+
+int
+otx2_nix_flow_ctrl_get(struct rte_eth_dev *eth_dev,
+		       struct rte_eth_fc_conf *fc_conf)
+{
+	struct otx2_eth_dev *dev = otx2_eth_pmd_priv(eth_dev);
+	struct cgx_pause_frm_cfg *req, *rsp;
+	struct otx2_mbox *mbox = dev->mbox;
+	int rc;
+
+	if (otx2_dev_is_vf(dev))
+		return -ENOTSUP;
+
+	req = otx2_mbox_alloc_msg_cgx_cfg_pause_frm(mbox);
+	req->set = 0;
+
+	rc = otx2_mbox_process_msg(mbox, (void *)&rsp);
+	if (rc)
+		goto done;
+
+	if (rsp->rx_pause && rsp->tx_pause)
+		fc_conf->mode = RTE_FC_FULL;
+	else if (rsp->rx_pause)
+		fc_conf->mode = RTE_FC_RX_PAUSE;
+	else if (rsp->tx_pause)
+		fc_conf->mode = RTE_FC_TX_PAUSE;
+	else
+		fc_conf->mode = RTE_FC_NONE;
+
+done:
+	return rc;
+}
+
+static int
+otx2_nix_cq_bp_cfg(struct rte_eth_dev *eth_dev, bool enb)
+{
+	struct otx2_eth_dev *dev = otx2_eth_pmd_priv(eth_dev);
+	struct otx2_fc_info *fc = &dev->fc_info;
+	struct otx2_mbox *mbox = dev->mbox;
+	struct nix_aq_enq_req *aq;
+	struct otx2_eth_rxq *rxq;
+	int i, rc;
+
+	for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
+		rxq = eth_dev->data->rx_queues[i];
+
+		aq = otx2_mbox_alloc_msg_nix_aq_enq(mbox);
+		if (!aq) {
+			/* The shared memory buffer can be full.
+			 * flush it and retry
+			 */
+			otx2_mbox_msg_send(mbox, 0);
+			rc = otx2_mbox_wait_for_rsp(mbox, 0);
+			if (rc < 0)
+				return rc;
+
+			aq = otx2_mbox_alloc_msg_nix_aq_enq(mbox);
+			if (!aq)
+				return -ENOMEM;
+		}
+		aq->qidx = rxq->rq;
+		aq->ctype = NIX_AQ_CTYPE_CQ;
+		aq->op = NIX_AQ_INSTOP_WRITE;
+
+		if (enb) {
+			aq->cq.bpid = fc->bpid[0];
+			aq->cq_mask.bpid = ~(aq->cq_mask.bpid);
+			aq->cq.bp = NIX_CQ_BP_LEVEL;
+			aq->cq_mask.bp = ~(aq->cq_mask.bp);
+		}
+
+		aq->cq.bp_ena = !!enb;
+		aq->cq_mask.bp_ena = ~(aq->cq_mask.bp_ena);
+	}
+
+	otx2_mbox_msg_send(mbox, 0);
+	rc = otx2_mbox_wait_for_rsp(mbox, 0);
+	if (rc < 0)
+		return rc;
+
+	return 0;
+}
+
+static int
+otx2_nix_rx_fc_cfg(struct rte_eth_dev *eth_dev, bool enb)
+{
+	return otx2_nix_cq_bp_cfg(eth_dev, enb);
+}
+
+int
+otx2_nix_flow_ctrl_set(struct rte_eth_dev *eth_dev,
+		       struct rte_eth_fc_conf *fc_conf)
+{
+	struct otx2_eth_dev *dev = otx2_eth_pmd_priv(eth_dev);
+	struct otx2_fc_info *fc = &dev->fc_info;
+	struct otx2_mbox *mbox = dev->mbox;
+	struct cgx_pause_frm_cfg *req;
+	uint8_t tx_pause, rx_pause;
+	int rc = 0;
+
+	if (otx2_dev_is_vf(dev))
+		return -ENOTSUP;
+
+	if (fc_conf->high_water || fc_conf->low_water || fc_conf->pause_time ||
+	    fc_conf->mac_ctrl_frame_fwd || fc_conf->autoneg) {
+		otx2_info("Flowctrl parameter is not supported");
+		return -EINVAL;
+	}
+
+	if (fc_conf->mode == fc->mode)
+		return 0;
+
+	rx_pause = (fc_conf->mode == RTE_FC_FULL) ||
+		    (fc_conf->mode == RTE_FC_RX_PAUSE);
+	tx_pause = (fc_conf->mode == RTE_FC_FULL) ||
+		    (fc_conf->mode == RTE_FC_TX_PAUSE);
+
+	/* Check if TX pause frame is already enabled or not */
+	if (fc->tx_pause ^ tx_pause) {
+		if (otx2_dev_is_A0(dev) && eth_dev->data->dev_started) {
+			/* on A0, CQ should be in disabled state
+			 * while setting flow control configuration.
+			 */
+			otx2_info("Stop the port=%d for setting flow control\n",
+				  eth_dev->data->port_id);
+				return 0;
+		}
+		/* TX pause frames, enable/disable flowctrl on RX side. */
+		rc = otx2_nix_rx_fc_cfg(eth_dev, tx_pause);
+		if (rc)
+			return rc;
+	}
+
+	req = otx2_mbox_alloc_msg_cgx_cfg_pause_frm(mbox);
+	req->set = 1;
+	req->rx_pause = rx_pause;
+	req->tx_pause = tx_pause;
+
+	rc = otx2_mbox_process(mbox);
+	if (rc)
+		return rc;
+
+	fc->tx_pause = tx_pause;
+	fc->rx_pause = rx_pause;
+	fc->mode = fc_conf->mode;
+
+	return rc;
+}
+
+int
+otx2_nix_update_flow_ctrl_mode(struct rte_eth_dev *eth_dev)
+{
+	struct otx2_eth_dev *dev = otx2_eth_pmd_priv(eth_dev);
+	struct rte_eth_fc_conf fc_conf;
+
+	if (otx2_dev_is_vf(dev))
+		return 0;
+
+	memset(&fc_conf, 0, sizeof(struct rte_eth_fc_conf));
+	/* Both Rx & Tx flow ctrl get enabled(RTE_FC_FULL) in HW
+	 * by AF driver, update those info in PMD structure.
+	 */
+	otx2_nix_flow_ctrl_get(eth_dev, &fc_conf);
+
+	/* To avoid Link credit deadlock on A0, disable Tx FC if it's enabled */
+	if (otx2_dev_is_A0(dev) &&
+	    (fc_conf.mode == RTE_FC_FULL || fc_conf.mode == RTE_FC_RX_PAUSE)) {
+		fc_conf.mode =
+				(fc_conf.mode == RTE_FC_FULL ||
+				fc_conf.mode == RTE_FC_TX_PAUSE) ?
+				RTE_FC_TX_PAUSE : RTE_FC_NONE;
+	}
+
+	return otx2_nix_flow_ctrl_set(eth_dev, &fc_conf);
+}
-- 
2.21.0