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From: Balazs Nemeth <bnemeth@redhat.com>
To: bnemeth@redhat.com, dev@dpdk.org
Cc: dsinghrawat@marvell.com, rmody@marvell.com,
	jerinjacobk@gmail.com, irusskikh@marvell.com
Subject: [dpdk-dev] [PATCH v2 3/7] net/qede: assume mbuf to free is never null
Date: Fri, 26 Mar 2021 12:01:26 +0100
Message-ID: <bf5461283fd76e6b1ef06e9da47d5f1d6f45b17c.1616754844.git.bnemeth@redhat.com> (raw)
In-Reply-To: <cover.1616754844.git.bnemeth@redhat.com>

The ring txq->sw_tx_ring is managed with txq->sw_tx_cons. As long as
txq->sw_tx_cons is correct, there is no need to check if
txq->sw_tx_ring[idx] is null explicitly.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
Reviewed-by: Igor Russkikh <irusskikh@marvell.com>
---
 drivers/net/qede/qede_rxtx.c | 59 +++++++++++++++---------------------
 1 file changed, 25 insertions(+), 34 deletions(-)

diff --git a/drivers/net/qede/qede_rxtx.c b/drivers/net/qede/qede_rxtx.c
index 0002e2c1e..9294f79eb 100644
--- a/drivers/net/qede/qede_rxtx.c
+++ b/drivers/net/qede/qede_rxtx.c
@@ -882,38 +882,6 @@ qede_tx_queue_start(struct rte_eth_dev *eth_dev, uint16_t tx_queue_id)
 	return rc;
 }
 
-static inline uint16_t
-qede_free_tx_pkt(struct qede_tx_queue *txq)
-{
-	struct rte_mbuf *mbuf;
-	uint16_t nb_segs;
-	uint16_t idx;
-	uint16_t ret;
-
-	idx = TX_CONS(txq);
-	mbuf = txq->sw_tx_ring[idx];
-	if (mbuf) {
-		nb_segs = mbuf->nb_segs;
-		PMD_TX_LOG(DEBUG, txq, "nb_segs to free %u\n", nb_segs);
-
-		ret = nb_segs;
-		while (nb_segs) {
-			/* It's like consuming rxbuf in recv() */
-			ecore_chain_consume(&txq->tx_pbl);
-			nb_segs--;
-		}
-
-		rte_pktmbuf_free(mbuf);
-		txq->sw_tx_ring[idx] = NULL;
-		txq->sw_tx_cons++;
-		PMD_TX_LOG(DEBUG, txq, "Freed tx packet\n");
-	} else {
-		ecore_chain_consume(&txq->tx_pbl);
-		ret = 1;
-	}
-	return ret;
-}
-
 static inline void
 qede_process_tx_compl(__rte_unused struct ecore_dev *edev,
 		      struct qede_tx_queue *txq)
@@ -921,6 +889,10 @@ qede_process_tx_compl(__rte_unused struct ecore_dev *edev,
 	uint16_t hw_bd_cons;
 	uint16_t sw_tx_cons;
 	uint16_t remaining;
+	uint16_t mask;
+	struct rte_mbuf *mbuf;
+	uint16_t nb_segs;
+	uint16_t idx;
 
 	rte_compiler_barrier();
 	sw_tx_cons = ecore_chain_get_cons_idx(&txq->tx_pbl);
@@ -930,11 +902,30 @@ qede_process_tx_compl(__rte_unused struct ecore_dev *edev,
 		   abs(hw_bd_cons - sw_tx_cons));
 #endif
 
+	mask = NUM_TX_BDS(txq);
+	idx = txq->sw_tx_cons & mask;
+
 	remaining = hw_bd_cons - sw_tx_cons;
 	txq->nb_tx_avail += remaining;
 
-	while (remaining)
-		remaining -= qede_free_tx_pkt(txq);
+	while (remaining) {
+		mbuf = txq->sw_tx_ring[idx];
+		RTE_ASSERT(mbuf);
+		nb_segs = mbuf->nb_segs;
+		remaining -= nb_segs;
+
+		PMD_TX_LOG(DEBUG, txq, "nb_segs to free %u\n", nb_segs);
+
+		while (nb_segs) {
+			ecore_chain_consume(&txq->tx_pbl);
+			nb_segs--;
+		}
+
+		rte_pktmbuf_free(mbuf);
+		idx = (idx + 1) & mask;
+		PMD_TX_LOG(DEBUG, txq, "Freed tx packet\n");
+	}
+	txq->sw_tx_cons = idx;
 }
 
 static int qede_drain_txq(struct qede_dev *qdev,
-- 
2.30.2


  parent reply	other threads:[~2021-03-26 11:02 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-26 11:01 [dpdk-dev] [PATCH v2 0/7] Optimize qede use of Rx/Tx entries Balazs Nemeth
2021-03-26 11:01 ` [dpdk-dev] [PATCH v2 1/7] net/qede: remove flags from Tx entry Balazs Nemeth
2021-03-26 11:01 ` [dpdk-dev] [PATCH v2 2/7] net/qede: get consumer index once Balazs Nemeth
2021-03-26 11:01 ` Balazs Nemeth [this message]
2021-03-26 11:01 ` [dpdk-dev] [PATCH v2 4/7] net/qede: free packets in bulk instead of one by one Balazs Nemeth
2021-03-26 11:01 ` [dpdk-dev] [PATCH v2 5/7] net/qede: prefetch hardware consumer Balazs Nemeth
2021-03-26 11:01 ` [dpdk-dev] [PATCH v2 6/7] net/qede: prefetch next packet to free Balazs Nemeth
2021-03-26 11:01 ` [dpdk-dev] [PATCH v2 7/7] net/qede: remove unnecessary field in Rx entry and simplify Balazs Nemeth
2021-03-27 14:02 ` [dpdk-dev] [PATCH v2 0/7] Optimize qede use of Rx/Tx entries Jerin Jacob

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