[dpdk-dev] [PATCH v8 08/11] net/failsafe: add fast burst functions

[Gaetan Rivet <gaetan.rivet@6wind.com>]

Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
Acked-by: Olga Shern <olgas@mellanox.com>
---
 drivers/net/failsafe/failsafe_private.h |   8 +++
 drivers/net/failsafe/failsafe_rxtx.c    | 124 ++++++++++++++++++++++++++------
 2 files changed, 112 insertions(+), 20 deletions(-)

diff --git a/drivers/net/failsafe/failsafe_private.h b/drivers/net/failsafe/failsafe_private.h
index f40ea2f..25a4dac 100644
--- a/drivers/net/failsafe/failsafe_private.h
+++ b/drivers/net/failsafe/failsafe_private.h
@@ -141,11 +141,18 @@ int failsafe_hotplug_alarm_cancel(struct rte_eth_dev *dev);
 
 /* RX / TX */
 
+void set_burst_fn(struct rte_eth_dev *dev, int force_safe);
+
 uint16_t failsafe_rx_burst(void *rxq,
 		struct rte_mbuf **rx_pkts, uint16_t nb_pkts);
 uint16_t failsafe_tx_burst(void *txq,
 		struct rte_mbuf **tx_pkts, uint16_t nb_pkts);
 
+uint16_t failsafe_rx_burst_fast(void *rxq,
+		struct rte_mbuf **rx_pkts, uint16_t nb_pkts);
+uint16_t failsafe_tx_burst_fast(void *txq,
+		struct rte_mbuf **tx_pkts, uint16_t nb_pkts);
+
 /* ARGS */
 
 int failsafe_args_parse(struct rte_eth_dev *dev, const char *params);
@@ -299,6 +306,7 @@ fs_switch_dev(struct rte_eth_dev *dev)
 	} else {
 		return;
 	}
+	set_burst_fn(dev, 0);
 	rte_wmb();
 }
 
diff --git a/drivers/net/failsafe/failsafe_rxtx.c b/drivers/net/failsafe/failsafe_rxtx.c
index a45b4e5..c15025f 100644
--- a/drivers/net/failsafe/failsafe_rxtx.c
+++ b/drivers/net/failsafe/failsafe_rxtx.c
@@ -31,16 +31,63 @@
  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <assert.h>
+
 #include <rte_mbuf.h>
 #include <rte_ethdev.h>
 
 #include "failsafe_private.h"
 
-/*
- * TODO: write fast version,
- * without additional checks, to be activated once
- * everything has been verified to comply.
- */
+static inline int
+fs_rx_unsafe(struct sub_device *sdev)
+{
+	return (ETH(sdev) == NULL) ||
+		(ETH(sdev)->rx_pkt_burst == NULL) ||
+		(sdev->state != DEV_STARTED);
+}
+
+static inline int
+fs_tx_unsafe(struct sub_device *sdev)
+{
+	return (sdev == NULL) ||
+		(ETH(sdev) == NULL) ||
+		(ETH(sdev)->tx_pkt_burst == NULL) ||
+		(sdev->state != DEV_STARTED);
+}
+
+void
+set_burst_fn(struct rte_eth_dev *dev, int force_safe)
+{
+	struct sub_device *sdev;
+	uint8_t i;
+	int need_safe;
+	int safe_set;
+
+	need_safe = force_safe;
+	FOREACH_SUBDEV(sdev, i, dev)
+		need_safe |= fs_rx_unsafe(sdev);
+	safe_set = (dev->rx_pkt_burst == &failsafe_rx_burst);
+	if (need_safe && !safe_set) {
+		DEBUG("Using safe RX bursts%s",
+		      (force_safe ? " (forced)" : ""));
+		dev->rx_pkt_burst = &failsafe_rx_burst;
+	} else if (!need_safe && safe_set) {
+		DEBUG("Using fast RX bursts");
+		dev->rx_pkt_burst = &failsafe_rx_burst_fast;
+	}
+	need_safe = force_safe || fs_tx_unsafe(TX_SUBDEV(dev));
+	safe_set = (dev->tx_pkt_burst == &failsafe_tx_burst);
+	if (need_safe && !safe_set) {
+		DEBUG("Using safe TX bursts%s",
+		      (force_safe ? " (forced)" : ""));
+		dev->tx_pkt_burst = &failsafe_tx_burst;
+	} else if (!need_safe && safe_set) {
+		DEBUG("Using fast TX bursts");
+		dev->tx_pkt_burst = &failsafe_tx_burst_fast;
+	}
+	rte_wmb();
+}
+
 uint16_t
 failsafe_rx_burst(void *queue,
 		  struct rte_mbuf **rx_pkts,
@@ -63,11 +110,7 @@ failsafe_rx_burst(void *queue,
 		if (i == priv->subs_tail)
 			i = priv->subs_head;
 		sdev = &priv->subs[i];
-		if (unlikely(ETH(sdev) == NULL))
-			continue;
-		if (unlikely(ETH(sdev)->rx_pkt_burst == NULL))
-			continue;
-		if (unlikely(sdev->state != DEV_STARTED))
+		if (unlikely(fs_rx_unsafe(sdev)))
 			continue;
 		sub_rxq = ETH(sdev)->data->rx_queues[rxq->qid];
 		nb_rx = ETH(sdev)->
@@ -80,11 +123,40 @@ failsafe_rx_burst(void *queue,
 	return 0;
 }
 
-/*
- * TODO: write fast version,
- * without additional checks, to be activated once
- * everything has been verified to comply.
- */
+uint16_t
+failsafe_rx_burst_fast(void *queue,
+			 struct rte_mbuf **rx_pkts,
+			 uint16_t nb_pkts)
+{
+	struct fs_priv *priv;
+	struct sub_device *sdev;
+	struct rxq *rxq;
+	void *sub_rxq;
+	uint16_t nb_rx;
+	uint8_t nb_polled, nb_subs;
+	uint8_t i;
+
+	rxq = queue;
+	priv = rxq->priv;
+	nb_subs = priv->subs_tail - priv->subs_head;
+	nb_polled = 0;
+	for (i = rxq->last_polled; nb_polled < nb_subs; nb_polled++) {
+		i++;
+		if (i == priv->subs_tail)
+			i = priv->subs_head;
+		sdev = &priv->subs[i];
+		assert(!fs_rx_unsafe(sdev));
+		sub_rxq = ETH(sdev)->data->rx_queues[rxq->qid];
+		nb_rx = ETH(sdev)->
+			rx_pkt_burst(sub_rxq, rx_pkts, nb_pkts);
+		if (nb_rx) {
+			rxq->last_polled = i;
+			return nb_rx;
+		}
+	}
+	return 0;
+}
+
 uint16_t
 failsafe_tx_burst(void *queue,
 		  struct rte_mbuf **tx_pkts,
@@ -96,12 +168,24 @@ failsafe_tx_burst(void *queue,
 
 	txq = queue;
 	sdev = TX_SUBDEV(txq->priv->dev);
-	if (unlikely(sdev == NULL))
-		return 0;
-	if (unlikely(ETH(sdev) == NULL))
-		return 0;
-	if (unlikely(ETH(sdev)->tx_pkt_burst == NULL))
+	if (unlikely(fs_tx_unsafe(sdev)))
 		return 0;
 	sub_txq = ETH(sdev)->data->tx_queues[txq->qid];
 	return ETH(sdev)->tx_pkt_burst(sub_txq, tx_pkts, nb_pkts);
 }
+
+uint16_t
+failsafe_tx_burst_fast(void *queue,
+			 struct rte_mbuf **tx_pkts,
+			 uint16_t nb_pkts)
+{
+	struct sub_device *sdev;
+	struct txq *txq;
+	void *sub_txq;
+
+	txq = queue;
+	sdev = TX_SUBDEV(txq->priv->dev);
+	assert(!fs_tx_unsafe(sdev));
+	sub_txq = ETH(sdev)->data->tx_queues[txq->qid];
+	return ETH(sdev)->tx_pkt_burst(sub_txq, tx_pkts, nb_pkts);
+}
-- 
2.1.4