[dpdk-dev] [PATCH v2] net/i40e: fix Tx fn selection when using new ethdev offloads

[Bruce Richardson <bruce.richardson@intel.com>]

The Tx function selection code in the driver only used the older txq
flags values to check whether the scalar or vector functions should be
used. This caused performance regressions with testpmd io-fwd as the
scalar path rather than the vector one was being used in the default
case. Fix this by changing the code to take account of new offloads and
deleting the defines used for the old ones.

Fixes: 7497d3e2f777 ("net/i40e: convert to new Tx offloads API")

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 drivers/net/i40e/i40e_rxtx.c | 39 ++++++++++++++++++---------------------
 1 file changed, 18 insertions(+), 21 deletions(-)

diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
index ec1ce54ca..006f5b846 100644
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c
@@ -40,9 +40,6 @@
 /* Base address of the HW descriptor ring should be 128B aligned. */
 #define I40E_RING_BASE_ALIGN	128
 
-#define I40E_SIMPLE_FLAGS ((uint32_t)ETH_TXQ_FLAGS_NOMULTSEGS | \
-					ETH_TXQ_FLAGS_NOOFFLOADS)
-
 #define I40E_TXD_CMD (I40E_TX_DESC_CMD_EOP | I40E_TX_DESC_CMD_RS)
 
 #ifdef RTE_LIBRTE_IEEE1588
@@ -2108,11 +2105,9 @@ i40e_dev_tx_queue_setup_runtime(struct rte_eth_dev *dev,
 				 dev->data->nb_tx_queues)) {
 		/**
 		 * If it is the first queue to setup,
-		 * set all flags to default and call
+		 * set all flags and call
 		 * i40e_set_tx_function.
 		 */
-		ad->tx_simple_allowed = true;
-		ad->tx_vec_allowed = true;
 		i40e_set_tx_function_flag(dev, txq);
 		i40e_set_tx_function(dev);
 		return 0;
@@ -2128,9 +2123,8 @@ i40e_dev_tx_queue_setup_runtime(struct rte_eth_dev *dev,
 	}
 	/* check simple tx conflict */
 	if (ad->tx_simple_allowed) {
-		if (((txq->txq_flags & I40E_SIMPLE_FLAGS) !=
-		     I40E_SIMPLE_FLAGS) ||
-		    txq->tx_rs_thresh < RTE_PMD_I40E_TX_MAX_BURST) {
+		if (txq->offloads != 0 ||
+				txq->tx_rs_thresh < RTE_PMD_I40E_TX_MAX_BURST) {
 			PMD_DRV_LOG(ERR, "No-simple tx is required.");
 			return -EINVAL;
 		}
@@ -3080,18 +3074,21 @@ i40e_set_tx_function_flag(struct rte_eth_dev *dev, struct i40e_tx_queue *txq)
 		I40E_DEV_PRIVATE_TO_ADAPTER(dev->data->dev_private);
 
 	/* Use a simple Tx queue (no offloads, no multi segs) if possible */
-	if (((txq->txq_flags & I40E_SIMPLE_FLAGS) == I40E_SIMPLE_FLAGS)
-			&& (txq->tx_rs_thresh >= RTE_PMD_I40E_TX_MAX_BURST)) {
-		if (txq->tx_rs_thresh <= RTE_I40E_TX_MAX_FREE_BUF_SZ) {
-			PMD_INIT_LOG(DEBUG, "Vector tx"
-				     " can be enabled on this txq.");
-
-		} else {
-			ad->tx_vec_allowed = false;
-		}
-	} else {
-		ad->tx_simple_allowed = false;
-	}
+	ad->tx_simple_allowed = (txq->offloads == 0 &&
+			txq->tx_rs_thresh >= RTE_PMD_I40E_TX_MAX_BURST);
+	ad->tx_vec_allowed = (ad->tx_simple_allowed &&
+			txq->tx_rs_thresh <= RTE_I40E_TX_MAX_FREE_BUF_SZ);
+
+	if (ad->tx_vec_allowed)
+		PMD_INIT_LOG(DEBUG, "Vector Tx can be enabled on Tx queue %u.",
+				txq->queue_id);
+	else if (ad->tx_simple_allowed)
+		PMD_INIT_LOG(DEBUG, "Simple Tx can be enabled on Tx queue %u.",
+				txq->queue_id);
+	else
+		PMD_INIT_LOG(DEBUG,
+				"Neither simple nor vector Tx enabled on Tx queue %u\n",
+				txq->queue_id);
 }
 
 void __attribute__((cold))
-- 
2.14.3