[PATCH 2/4] net/ark: update ddm code to match current hardware version

[Ed Czeck <ed.czeck@atomicrules.com>]

new version code
remove device-level start, stop, and reset operations
add queue-based start, stop and reset as required by hardware

Signed-off-by: Ed Czeck <ed.czeck@atomicrules.com>
---
 drivers/net/ark/ark_ddm.c       | 80 +++++----------------------------
 drivers/net/ark/ark_ddm.h       | 30 +++++++------
 drivers/net/ark/ark_ethdev.c    | 33 --------------
 drivers/net/ark/ark_ethdev_tx.c | 35 +++------------
 4 files changed, 34 insertions(+), 144 deletions(-)

diff --git a/drivers/net/ark/ark_ddm.c b/drivers/net/ark/ark_ddm.c
index b16c739d50..eb88349b7b 100644
--- a/drivers/net/ark/ark_ddm.c
+++ b/drivers/net/ark/ark_ddm.c
@@ -14,95 +14,45 @@ int
 ark_ddm_verify(struct ark_ddm_t *ddm)
 {
 	uint32_t hw_const;
+	uint32_t hw_ver;
 	if (sizeof(struct ark_ddm_t) != ARK_DDM_EXPECTED_SIZE) {
 		ARK_PMD_LOG(ERR, "DDM structure looks incorrect %d vs %zd\n",
 			    ARK_DDM_EXPECTED_SIZE, sizeof(struct ark_ddm_t));
 		return -1;
 	}
 
-	hw_const = ddm->cfg.const0;
-	if (hw_const == ARK_DDM_CONST3)
+	hw_const = ddm->cfg.idnum;
+	hw_ver = ddm->cfg.vernum;
+	if (hw_const == ARK_DDM_MODID && hw_ver == ARK_DDM_MODVER)
 		return 0;
 
-	if (hw_const == ARK_DDM_CONST1) {
-		ARK_PMD_LOG(ERR,
-			    "ARK: DDM module is version 1, "
-			    "PMD expects version 2\n");
-		return -1;
-	}
-
-	if (hw_const == ARK_DDM_CONST2) {
-		ARK_PMD_LOG(ERR,
-			    "ARK: DDM module is version 2, "
-			    "PMD expects version 3\n");
-		return -1;
-	}
 	ARK_PMD_LOG(ERR,
-		    "ARK: DDM module not found as expected 0x%08x\n",
-		    ddm->cfg.const0);
+		    "ARK: DDM module not found as expected"
+		    " id: %08x ver: %08x\n",
+		    hw_const, hw_ver);
 	return -1;
 }
 
 void
-ark_ddm_start(struct ark_ddm_t *ddm)
-{
-	ddm->cfg.command = 1;
-}
-
-int
-ark_ddm_stop(struct ark_ddm_t *ddm, const int wait)
+ark_ddm_queue_enable(struct ark_ddm_t *ddm, int enable)
 {
-	int cnt = 0;
-
-	ddm->cfg.command = 2;
-	rte_wmb();
-	while (wait && (ddm->cfg.stop_flushed & 0x01) == 0) {
-		if (cnt++ > 1000)
-			return 1;
-
-		usleep(10);
-	}
-	return 0;
+	ddm->setup.qcommand = enable ? 1U : 0U;
 }
 
 void
-ark_ddm_reset(struct ark_ddm_t *ddm)
-{
-	int status;
-
-	/* reset only works if ddm has stopped properly. */
-	status = ark_ddm_stop(ddm, 1);
-
-	if (status != 0) {
-		ARK_PMD_LOG(NOTICE, "%s  stop failed  doing forced reset\n",
-			      __func__);
-		ddm->cfg.command = 4;
-		usleep(10);
-	}
-	ddm->cfg.command = 3;
-}
-
-void
-ark_ddm_setup(struct ark_ddm_t *ddm, rte_iova_t cons_addr, uint32_t interval)
+ark_ddm_queue_setup(struct ark_ddm_t *ddm, rte_iova_t cons_addr)
 {
 	ddm->setup.cons_write_index_addr = cons_addr;
-	ddm->setup.write_index_interval = interval / 4;	/* 4 ns period */
+	ddm->setup.cons_index = 0;
 }
 
+/* Global stats clear */
 void
 ark_ddm_stats_reset(struct ark_ddm_t *ddm)
 {
 	ddm->cfg.tlp_stats_clear = 1;
 }
 
-void
-ark_ddm_dump(struct ark_ddm_t *ddm, const char *msg)
-{
-	ARK_PMD_LOG(DEBUG, "%s Stopped: %d\n", msg,
-		     ark_ddm_is_stopped(ddm)
-		     );
-}
-
 void
 ark_ddm_dump_stats(struct ark_ddm_t *ddm, const char *msg)
 {
@@ -116,12 +66,6 @@ ark_ddm_dump_stats(struct ark_ddm_t *ddm, const char *msg)
 		      "MBufs", stats->tx_mbuf_count);
 }
 
-int
-ark_ddm_is_stopped(struct ark_ddm_t *ddm)
-{
-	return (ddm->cfg.stop_flushed & 0x01) != 0;
-}
-
 uint64_t
 ark_ddm_queue_byte_count(struct ark_ddm_t *ddm)
 {
diff --git a/drivers/net/ark/ark_ddm.h b/drivers/net/ark/ark_ddm.h
index 687ff2519a..886bb088ce 100644
--- a/drivers/net/ark/ark_ddm.h
+++ b/drivers/net/ark/ark_ddm.h
@@ -40,17 +40,24 @@ union ark_tx_meta {
  */
 #define ARK_DDM_CFG 0x0000
 /* Set unique HW ID for hardware version */
-#define ARK_DDM_CONST3 (0x334d4444)
-#define ARK_DDM_CONST2 (0x324d4444)
-#define ARK_DDM_CONST1 (0xfacecafe)
+#define ARK_DDM_MODID 0x204d4444
+#define ARK_DDM_MODVER 0x37313232
 
 struct ark_ddm_cfg_t {
+	union {
+		char id[4];
+		uint32_t idnum;
+	};
+	union {
+		char ver[4];
+		uint32_t vernum;
+		volatile uint32_t tlp_stats_clear;
+	};
 	uint32_t r0;
-	volatile uint32_t tlp_stats_clear;
-	uint32_t const0;
 	volatile uint32_t tag_max;
 	volatile uint32_t command;
-	volatile uint32_t stop_flushed;
+	uint32_t write_index_interval;	/* 4ns each */
+	volatile uint64_t qflow;
 };
 
 #define ARK_DDM_STATS 0x0020
@@ -108,7 +115,7 @@ struct ark_ddm_cpld_ps_t {
 #define ARK_DDM_SETUP  0x00e0
 struct ark_ddm_setup_t {
 	rte_iova_t cons_write_index_addr;
-	uint32_t write_index_interval;	/* 4ns each */
+	volatile uint32_t qcommand;
 	volatile uint32_t cons_index;
 };
 
@@ -141,17 +148,12 @@ struct ark_ddm_t {
 
 /* DDM function prototype */
 int ark_ddm_verify(struct ark_ddm_t *ddm);
-void ark_ddm_start(struct ark_ddm_t *ddm);
-int ark_ddm_stop(struct ark_ddm_t *ddm, const int wait);
-void ark_ddm_reset(struct ark_ddm_t *ddm);
 void ark_ddm_stats_reset(struct ark_ddm_t *ddm);
-void ark_ddm_setup(struct ark_ddm_t *ddm, rte_iova_t cons_addr,
-		   uint32_t interval);
+void ark_ddm_queue_setup(struct ark_ddm_t *ddm, rte_iova_t cons_addr);
 void ark_ddm_dump_stats(struct ark_ddm_t *ddm, const char *msg);
-void ark_ddm_dump(struct ark_ddm_t *ddm, const char *msg);
-int ark_ddm_is_stopped(struct ark_ddm_t *ddm);
 uint64_t ark_ddm_queue_byte_count(struct ark_ddm_t *ddm);
 uint64_t ark_ddm_queue_pkt_count(struct ark_ddm_t *ddm);
 void ark_ddm_queue_reset_stats(struct ark_ddm_t *ddm);
+void ark_ddm_queue_enable(struct ark_ddm_t *ddm, int enable);
 
 #endif
diff --git a/drivers/net/ark/ark_ethdev.c b/drivers/net/ark/ark_ethdev.c
index c0578b85ce..07d1d2178d 100644
--- a/drivers/net/ark/ark_ethdev.c
+++ b/drivers/net/ark/ark_ethdev.c
@@ -527,10 +527,6 @@ ark_config_device(struct rte_eth_dev *dev)
 		mpu = RTE_PTR_ADD(mpu, ARK_MPU_QOFFSET);
 	}
 
-	/* TX -- DDM */
-	if (ark_ddm_stop(ark->ddm.v, 1))
-		ARK_PMD_LOG(ERR, "Unable to stop DDM\n");
-
 	mpu = ark->mputx.v;
 	num_q = ark_api_num_queues(mpu);
 	ark->tx_queues = num_q;
@@ -538,10 +534,6 @@ ark_config_device(struct rte_eth_dev *dev)
 		mpu = RTE_PTR_ADD(mpu, ARK_MPU_QOFFSET);
 	}
 
-	ark_ddm_reset(ark->ddm.v);
-	ark_ddm_stats_reset(ark->ddm.v);
-
-	ark_ddm_stop(ark->ddm.v, 0);
 	if (ark->rqpacing)
 		ark_rqp_stats_reset(ark->rqpacing);
 
@@ -595,9 +587,6 @@ eth_ark_dev_start(struct rte_eth_dev *dev)
 	for (i = 0; i < dev->data->nb_tx_queues; i++)
 		eth_ark_tx_queue_start(dev, i);
 
-	/* start DDM */
-	ark_ddm_start(ark->ddm.v);
-
 	ark->started = 1;
 	/* set xmit and receive function */
 	dev->rx_pkt_burst = &eth_ark_recv_pkts;
@@ -671,28 +660,6 @@ eth_ark_dev_stop(struct rte_eth_dev *dev)
 		}
 	}
 
-	/* Stop DDM */
-	/* Wait up to 0.1 second.  each stop is up to 1000 * 10 useconds */
-	for (i = 0; i < 10; i++) {
-		status = ark_ddm_stop(ark->ddm.v, 1);
-		if (status == 0)
-			break;
-	}
-	if (status || i != 0) {
-		ARK_PMD_LOG(ERR, "DDM stop anomaly. status:"
-			    " %d iter: %u. (%s)\n",
-			    status,
-			    i,
-			    __func__);
-		ark_ddm_dump(ark->ddm.v, "Stop anomaly");
-
-		mpu = ark->mputx.v;
-		for (i = 0; i < ark->tx_queues; i++) {
-			ark_mpu_dump(mpu, "DDM failure dump", i);
-			mpu = RTE_PTR_ADD(mpu, ARK_MPU_QOFFSET);
-		}
-	}
-
 	/* STOP RX Side */
 	/* Stop UDM  multiple tries attempted */
 	for (i = 0; i < 10; i++) {
diff --git a/drivers/net/ark/ark_ethdev_tx.c b/drivers/net/ark/ark_ethdev_tx.c
index abdce6a8cc..5940a592a2 100644
--- a/drivers/net/ark/ark_ethdev_tx.c
+++ b/drivers/net/ark/ark_ethdev_tx.c
@@ -59,12 +59,6 @@ static int eth_ark_tx_jumbo(struct ark_tx_queue *queue,
 static int eth_ark_tx_hw_queue_config(struct ark_tx_queue *queue);
 static void free_completed_tx(struct ark_tx_queue *queue);
 
-static inline void
-ark_tx_hw_queue_stop(struct ark_tx_queue *queue)
-{
-	ark_mpu_stop(queue->mpu);
-}
-
 /* ************************************************************************* */
 static inline void
 eth_ark_tx_desc_fill(struct ark_tx_queue *queue,
@@ -309,7 +303,6 @@ static int
 eth_ark_tx_hw_queue_config(struct ark_tx_queue *queue)
 {
 	rte_iova_t queue_base, ring_base, cons_index_addr;
-	uint32_t write_interval_ns;
 
 	/* Verify HW -- MPU */
 	if (ark_mpu_verify(queue->mpu, sizeof(union ark_tx_meta)))
@@ -326,28 +319,9 @@ eth_ark_tx_hw_queue_config(struct ark_tx_queue *queue)
 	/* Stop and Reset and configure MPU */
 	ark_mpu_configure(queue->mpu, ring_base, queue->queue_size, 1);
 
-	/*
-	 * Adjust the write interval based on queue size --
-	 * increase pcie traffic  when low mbuf count
-	 * Queue sizes less than 128 are not allowed
-	 */
-	switch (queue->queue_size) {
-	case 128:
-		write_interval_ns = 500;
-		break;
-	case 256:
-		write_interval_ns = 500;
-		break;
-	case 512:
-		write_interval_ns = 1000;
-		break;
-	default:
-		write_interval_ns = 2000;
-		break;
-	}
-
 	/* Completion address in UDM */
-	ark_ddm_setup(queue->ddm, cons_index_addr, write_interval_ns);
+	ark_ddm_queue_setup(queue->ddm, cons_index_addr);
+	ark_ddm_queue_reset_stats(queue->ddm);
 
 	return 0;
 }
@@ -360,7 +334,8 @@ eth_ark_tx_queue_release(void *vtx_queue)
 
 	queue = (struct ark_tx_queue *)vtx_queue;
 
-	ark_tx_hw_queue_stop(queue);
+	ark_ddm_queue_enable(queue->ddm, 0);
+	ark_mpu_stop(queue->mpu);
 
 	queue->cons_index = queue->prod_index;
 	free_completed_tx(queue);
@@ -386,6 +361,7 @@ eth_ark_tx_queue_stop(struct rte_eth_dev *dev, uint16_t queue_id)
 			return -1;
 	}
 
+	ark_ddm_queue_enable(queue->ddm, 0);
 	ark_mpu_stop(queue->mpu);
 	free_completed_tx(queue);
 
@@ -404,6 +380,7 @@ eth_ark_tx_queue_start(struct rte_eth_dev *dev, uint16_t queue_id)
 		return 0;
 
 	ark_mpu_start(queue->mpu);
+	ark_ddm_queue_enable(queue->ddm, 1);
 	dev->data->tx_queue_state[queue_id] = RTE_ETH_QUEUE_STATE_STARTED;
 
 	return 0;
-- 
2.17.1