[dpdk-dev] [PATCH v2 4/6] ixgbe: Unify the rx_pkt_bulk callback initialization

[Vlad Zolotarov <vladz@cloudius-systems.com>]

   - Set the callback in a single function (set_rx_function()) that is called from
     ixgbe_dev_rx_init() for a primary process and from eth_ixgbe_dev_init()
     for a secondary processes. This is instead of multiple, hard to track places.
   - Bug fix: rx_pkt_bulk callback setting was done based on the last queue configuration,
              while callback is per-port thus all queues configuration should be taken
              into an account. Therefore added ixgbe_hw.rx_bulk_alloc_allowed to hold
              the appropriate state that is then considered in set_rx_function().
   - Bug fix: vector scattered packets callback was called regardless the appropriate
              preconditions.

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
---
 lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h |   1 +
 lib/librte_pmd_ixgbe/ixgbe_ethdev.c     |  14 ++-
 lib/librte_pmd_ixgbe/ixgbe_rxtx.c       | 158 ++++++++++++++++++++------------
 lib/librte_pmd_ixgbe/ixgbe_rxtx.h       |  20 +++-
 4 files changed, 128 insertions(+), 65 deletions(-)

diff --git a/lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h b/lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h
index c67d462..c60081c 100644
--- a/lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h
+++ b/lib/librte_pmd_ixgbe/ixgbe/ixgbe_type.h
@@ -3657,6 +3657,7 @@ struct ixgbe_hw {
 	bool force_full_reset;
 	bool allow_unsupported_sfp;
 	bool wol_enabled;
+	bool rx_bulk_alloc_allowed;
 };
 
 #define ixgbe_call_func(hw, func, params, error) \
diff --git a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
index 9bdc046..f93dcfc 100644
--- a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
+++ b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
@@ -760,8 +760,8 @@ eth_ixgbe_dev_init(__attribute__((unused)) struct eth_driver *eth_drv,
 			                   "Using default TX function.");
 		}
 
-		if (eth_dev->data->scattered_rx)
-			eth_dev->rx_pkt_burst = ixgbe_recv_scattered_pkts;
+		set_rx_function(eth_dev);
+
 		return 0;
 	}
 	pci_dev = eth_dev->pci_dev;
@@ -771,6 +771,15 @@ eth_ixgbe_dev_init(__attribute__((unused)) struct eth_driver *eth_drv,
 	hw->vendor_id = pci_dev->id.vendor_id;
 	hw->hw_addr = (void *)pci_dev->mem_resource[0].addr;
 	hw->allow_unsupported_sfp = 1;
+#ifdef RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC
+	/*
+	 * Initialize to TRUE. If any of Rx queues doesn't meet the bulk
+	 * allocation preconditions we will reset it.
+	 */
+	hw->rx_bulk_alloc_allowed = true;
+#else
+	hw->rx_bulk_alloc_allowed = false;
+#endif /* RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC */
 
 	/* Initialize the shared code (base driver) */
 #ifdef RTE_NIC_BYPASS
@@ -1641,6 +1650,7 @@ ixgbe_dev_stop(struct rte_eth_dev *dev)
 
 	/* Clear stored conf */
 	dev->data->scattered_rx = 0;
+	hw->rx_bulk_alloc_allowed = false;
 
 	/* Clear recorded link status */
 	memset(&link, 0, sizeof(link));
diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
index 4c67a9e..bdac885 100644
--- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
+++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
@@ -2096,12 +2096,12 @@ check_rx_burst_bulk_alloc_preconditions(__rte_unused struct igb_rx_queue *rxq)
 
 /* Reset dynamic igb_rx_queue fields back to defaults */
 static void
-ixgbe_reset_rx_queue(struct igb_rx_queue *rxq)
+ixgbe_reset_rx_queue(struct ixgbe_hw *hw, struct igb_rx_queue *rxq)
 {
 	static const union ixgbe_adv_rx_desc zeroed_desc = { .read = {
 			.pkt_addr = 0}};
 	unsigned i;
-	uint16_t len;
+	uint16_t len = rxq->nb_rx_desc;
 
 	/*
 	 * By default, the Rx queue setup function allocates enough memory for
@@ -2113,14 +2113,9 @@ ixgbe_reset_rx_queue(struct igb_rx_queue *rxq)
 	 * constraints here to see if we need to zero out memory after the end
 	 * of the H/W descriptor ring.
 	 */
-#ifdef RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC
-	if (check_rx_burst_bulk_alloc_preconditions(rxq) == 0)
+	if (hw->rx_bulk_alloc_allowed)
 		/* zero out extra memory */
-		len = (uint16_t)(rxq->nb_rx_desc + RTE_PMD_IXGBE_RX_MAX_BURST);
-	else
-#endif
-		/* do not zero out extra memory */
-		len = rxq->nb_rx_desc;
+		len += RTE_PMD_IXGBE_RX_MAX_BURST;
 
 	/*
 	 * Zero out HW ring memory. Zero out extra memory at the end of
@@ -2162,7 +2157,6 @@ ixgbe_dev_rx_queue_setup(struct rte_eth_dev *dev,
 	const struct rte_memzone *rz;
 	struct igb_rx_queue *rxq;
 	struct ixgbe_hw     *hw;
-	int use_def_burst_func = 1;
 	uint16_t len;
 
 	PMD_INIT_FUNC_TRACE();
@@ -2247,11 +2241,10 @@ ixgbe_dev_rx_queue_setup(struct rte_eth_dev *dev,
 	 * S/W ring to make sure look-ahead logic in bulk alloc Rx burst
 	 * function does not access an invalid memory region.
 	 */
-#ifdef RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC
-	len = (uint16_t)(nb_desc + RTE_PMD_IXGBE_RX_MAX_BURST);
-#else
 	len = nb_desc;
-#endif
+	if (hw->rx_bulk_alloc_allowed)
+		len += RTE_PMD_IXGBE_RX_MAX_BURST;
+
 	rxq->sw_ring = rte_zmalloc_socket("rxq->sw_ring",
 					  sizeof(struct igb_rx_entry) * len,
 					  RTE_CACHE_LINE_SIZE, socket_id);
@@ -2264,45 +2257,24 @@ ixgbe_dev_rx_queue_setup(struct rte_eth_dev *dev,
 
 	/*
 	 * Certain constraints must be met in order to use the bulk buffer
-	 * allocation Rx burst function.
+	 * allocation Rx burst function. If any of Rx queues doesn't meet them
+	 * the feature should be disabled for the whole port.
 	 */
-	use_def_burst_func = check_rx_burst_bulk_alloc_preconditions(rxq);
+	if (check_rx_burst_bulk_alloc_preconditions(rxq)) {
+		PMD_INIT_LOG(DEBUG, "queue[%d] doesn't meet Rx Bulk Alloc "
+				    "preconditions - canceling the feature for "
+				    "the whole port[%d]",
+			     rxq->queue_id, rxq->port_id);
+		hw->rx_bulk_alloc_allowed = false;
+	}
 
 #ifdef RTE_IXGBE_INC_VECTOR
 	ixgbe_rxq_vec_setup(rxq);
 #endif
-	/*
-	 * TODO: This must be moved to ixgbe_dev_rx_init() since rx_pkt_burst
-	 * is a global per-device callback thus bulk allocation may be used
-	 * only if all queues meet the above preconditions.
-	 */
 
-	/* Check if pre-conditions are satisfied, and no Scattered Rx */
-	if (!use_def_burst_func && !dev->data->scattered_rx) {
-#ifdef RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC
-		PMD_INIT_LOG(DEBUG, "Rx Burst Bulk Alloc Preconditions are "
-			     "satisfied. Rx Burst Bulk Alloc function will be "
-			     "used on port=%d, queue=%d.",
-			     rxq->port_id, rxq->queue_id);
-		dev->rx_pkt_burst = ixgbe_recv_pkts_bulk_alloc;
-#ifdef RTE_IXGBE_INC_VECTOR
-		if (!ixgbe_rx_vec_condition_check(dev)) {
-			PMD_INIT_LOG(INFO, "Vector rx enabled, please make "
-				     "sure RX burst size no less than 32.");
-			dev->rx_pkt_burst = ixgbe_recv_pkts_vec;
-		}
-#endif
-#endif
-	} else {
-		PMD_INIT_LOG(DEBUG, "Rx Burst Bulk Alloc Preconditions "
-			     "are not satisfied, Scattered Rx is requested, "
-			     "or RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC is not "
-			     "enabled (port=%d, queue=%d).",
-			     rxq->port_id, rxq->queue_id);
-	}
 	dev->data->rx_queues[queue_idx] = rxq;
 
-	ixgbe_reset_rx_queue(rxq);
+	ixgbe_reset_rx_queue(hw, rxq);
 
 	return 0;
 }
@@ -2356,6 +2328,7 @@ void
 ixgbe_dev_clear_queues(struct rte_eth_dev *dev)
 {
 	unsigned i;
+	struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 
 	PMD_INIT_FUNC_TRACE();
 
@@ -2371,7 +2344,7 @@ ixgbe_dev_clear_queues(struct rte_eth_dev *dev)
 		struct igb_rx_queue *rxq = dev->data->rx_queues[i];
 		if (rxq != NULL) {
 			ixgbe_rx_queue_release_mbufs(rxq);
-			ixgbe_reset_rx_queue(rxq);
+			ixgbe_reset_rx_queue(hw, rxq);
 		}
 	}
 }
@@ -3533,6 +3506,57 @@ ixgbe_dev_mq_tx_configure(struct rte_eth_dev *dev)
 	return 0;
 }
 
+void set_rx_function(struct rte_eth_dev *dev)
+{
+	struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	bool vec_is_allowed = !ixgbe_rx_vec_condition_check(dev);
+
+	if (!vec_is_allowed)
+		PMD_INIT_LOG(DEBUG, "Port[%d] doesn't meet Vector Rx "
+				    "preconditions or RTE_IXGBE_INC_VECTOR is "
+				    "not enabled",
+			     dev->data->port_id);
+
+	/* Check if bulk alloc is allowed and no Scattered Rx */
+	if (hw->rx_bulk_alloc_allowed && !dev->data->scattered_rx) {
+		PMD_INIT_LOG(DEBUG, "Rx Burst Bulk Alloc Preconditions are "
+				    "satisfied. Rx Burst Bulk Alloc function "
+				    "will be used on port=%d.",
+			     dev->data->port_id);
+		dev->rx_pkt_burst = ixgbe_recv_pkts_bulk_alloc;
+
+		if (vec_is_allowed) {
+			PMD_INIT_LOG(INFO, "Vector rx enabled, please make "
+					   "sure RX burst size no less "
+					   "than 32.");
+			dev->rx_pkt_burst = ixgbe_recv_pkts_vec;
+		}
+	} else {
+		dev->rx_pkt_burst = ixgbe_recv_pkts;
+
+		PMD_INIT_LOG(DEBUG, "Rx Burst Bulk Alloc Preconditions are not "
+				    "satisfied, or Scattered Rx is requested, "
+				    "or RTE_LIBRTE_IXGBE_RX_ALLOW_BULK_ALLOC "
+				    "is not enabled (port=%d).",
+			     dev->data->port_id);
+	}
+
+	if (dev->data->scattered_rx) {
+		if (vec_is_allowed) {
+			PMD_INIT_LOG(DEBUG, "Using Vector Scattered Rx Bulk "
+					    "callback (port=%d).",
+				     dev->data->port_id);
+			dev->rx_pkt_burst = ixgbe_recv_scattered_pkts_vec;
+		} else {
+			PMD_INIT_LOG(DEBUG, "Using Regualr (non-vector) "
+					    "Scattered Rx Bulk callback "
+					    "(port=%d).",
+				     dev->data->port_id);
+			dev->rx_pkt_burst = ixgbe_recv_scattered_pkts;
+		}
+	}
+}
+
 /*
  * Initializes Receive Unit.
  */
@@ -3673,24 +3697,13 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 			if (!dev->data->scattered_rx)
 				PMD_INIT_LOG(DEBUG, "forcing scatter mode");
 			dev->data->scattered_rx = 1;
-#ifdef RTE_IXGBE_INC_VECTOR
-			dev->rx_pkt_burst = ixgbe_recv_scattered_pkts_vec;
-#else
-			dev->rx_pkt_burst = ixgbe_recv_scattered_pkts;
-#endif
 		}
 	}
 
-	if (rx_conf->enable_scatter) {
-		if (!dev->data->scattered_rx)
-			PMD_INIT_LOG(DEBUG, "forcing scatter mode");
-#ifdef RTE_IXGBE_INC_VECTOR
-		dev->rx_pkt_burst = ixgbe_recv_scattered_pkts_vec;
-#else
-		dev->rx_pkt_burst = ixgbe_recv_scattered_pkts;
-#endif
+	if (rx_conf->enable_scatter)
 		dev->data->scattered_rx = 1;
-	}
+
+	set_rx_function(dev);
 
 	/*
 	 * Device configured with multiple RX queues.
@@ -3967,7 +3980,7 @@ ixgbe_dev_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id)
 		rte_delay_us(RTE_IXGBE_WAIT_100_US);
 
 		ixgbe_rx_queue_release_mbufs(rxq);
-		ixgbe_reset_rx_queue(rxq);
+		ixgbe_reset_rx_queue(hw, rxq);
 	} else
 		return -1;
 
@@ -4331,3 +4344,26 @@ ixgbevf_dev_rxtx_start(struct rte_eth_dev *dev)
 
 	}
 }
+
+/* Stubs needed for linkage when CONFIG_RTE_IXGBE_INC_VECTOR is set to 'n' */
+#ifndef RTE_IXGBE_INC_VECTOR
+int ixgbe_rx_vec_condition_check(
+	struct rte_eth_dev __rte_unused *dev)
+{
+	return -1;
+}
+
+uint16_t
+ixgbe_recv_pkts_vec(void __rte_unused *rx_queue,
+		    struct rte_mbuf __rte_unused **rx_pkts,
+		    uint16_t __rte_unused nb_pkts)
+{
+	return 0;
+}
+
+uint16_t ixgbe_recv_scattered_pkts_vec(void __rte_unused *rx_queue,
+	struct rte_mbuf __rte_unused **rx_pkts, uint16_t __rte_unused nb_pkts)
+{
+	return 0;
+}
+#endif
diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.h b/lib/librte_pmd_ixgbe/ixgbe_rxtx.h
index 329007c..18c9154 100644
--- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.h
+++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.h
@@ -255,16 +255,32 @@ struct ixgbe_txq_ops {
  */
 void set_tx_function(struct rte_eth_dev *dev, struct igb_tx_queue *txq);
 
-#ifdef RTE_IXGBE_INC_VECTOR
+/**
+ * Sets the rx_pkt_burst callback in the ixgbe rte_eth_dev instance.
+ *
+ * Sets the callback based on the device parameters:
+ *  - ixgbe_hw.rx_bulk_alloc_allowed
+ *  - rte_eth_dev_data.scattered_rx
+ *  - rte_eth_dev_data.lro
+ *  - conditions checked in ixgbe_rx_vec_condition_check()
+ *
+ *  This means that the parameters above have to be configured prior to calling
+ *  to this function.
+ *
+ * @dev rte_eth_dev handle
+ */
+void set_rx_function(struct rte_eth_dev *dev);
+
 uint16_t ixgbe_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
 		uint16_t nb_pkts);
 uint16_t ixgbe_recv_scattered_pkts_vec(void *rx_queue,
 		struct rte_mbuf **rx_pkts, uint16_t nb_pkts);
+int ixgbe_rx_vec_condition_check(struct rte_eth_dev *dev);
+#ifdef RTE_IXGBE_INC_VECTOR
 uint16_t ixgbe_xmit_pkts_vec(void *tx_queue, struct rte_mbuf **tx_pkts,
 		uint16_t nb_pkts);
 int ixgbe_txq_vec_setup(struct igb_tx_queue *txq);
 int ixgbe_rxq_vec_setup(struct igb_rx_queue *rxq);
-int ixgbe_rx_vec_condition_check(struct rte_eth_dev *dev);
 #endif
 
 #endif
-- 
2.1.0