[dpdk-dev] [PATCH v1 1/4] net/ixgbe: maximize vector rx burst for ixgbe

[Jeff Guo <jia.guo@intel.com>]

The limitation of burst size in vector rx was removed, since it should
retrieve as much received packets as possible. And also the scattered
receive path should use a wrapper function to achieve the goal of
burst maximizing.

Signed-off-by: Jeff Guo <jia.guo@intel.com>
---
 drivers/net/ixgbe/ixgbe_rxtx_vec_neon.c | 51 ++++++++++++++++++++-----
 drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c  | 48 ++++++++++++++++-------
 2 files changed, 76 insertions(+), 23 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_rxtx_vec_neon.c b/drivers/net/ixgbe/ixgbe_rxtx_vec_neon.c
index aa27ee177..95e40aa13 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx_vec_neon.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx_vec_neon.c
@@ -206,6 +206,13 @@ desc_to_ptype_v(uint64x2_t descs[4], uint16_t pkt_type_mask,
 				vgetq_lane_u32(tunnel_check, 3));
 }
 
+/**
+ * vPMD raw receive routine, only accept(nb_pkts >= RTE_IXGBE_DESCS_PER_LOOP)
+ *
+ * Notice:
+ * - nb_pkts < RTE_IXGBE_DESCS_PER_LOOP, just return no packet
+ * - floor align nb_pkts to a RTE_IXGBE_DESC_PER_LOOP power-of-two
+ */
 static inline uint16_t
 _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts,
 		   uint16_t nb_pkts, uint8_t *split_packet)
@@ -226,9 +233,6 @@ _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts,
 	uint16x8_t crc_adjust = {0, 0, rxq->crc_len, 0,
 				 rxq->crc_len, 0, 0, 0};
 
-	/* nb_pkts shall be less equal than RTE_IXGBE_MAX_RX_BURST */
-	nb_pkts = RTE_MIN(nb_pkts, RTE_IXGBE_MAX_RX_BURST);
-
 	/* nb_pkts has to be floor-aligned to RTE_IXGBE_DESCS_PER_LOOP */
 	nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_IXGBE_DESCS_PER_LOOP);
 
@@ -382,7 +386,7 @@ _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts,
 	return nb_pkts_recd;
 }
 
-/*
+/**
  * vPMD receive routine, only accept(nb_pkts >= RTE_IXGBE_DESCS_PER_LOOP)
  *
  * Notice:
@@ -399,19 +403,17 @@ ixgbe_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
 	return _recv_raw_pkts_vec(rx_queue, rx_pkts, nb_pkts, NULL);
 }
 
-/*
+/**
  * vPMD receive routine that reassembles scattered packets
  *
  * Notice:
  * - don't support ol_flags for rss and csum err
  * - nb_pkts < RTE_IXGBE_DESCS_PER_LOOP, just return no packet
- * - nb_pkts > RTE_IXGBE_MAX_RX_BURST, only scan RTE_IXGBE_MAX_RX_BURST
- *   numbers of DD bit
  * - floor align nb_pkts to a RTE_IXGBE_DESC_PER_LOOP power-of-two
  */
-uint16_t
-ixgbe_recv_scattered_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
-		uint16_t nb_pkts)
+static uint16_t
+ixgbe_recv_scattered_burst_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
+			       uint16_t nb_pkts)
 {
 	struct ixgbe_rx_queue *rxq = rx_queue;
 	uint8_t split_flags[RTE_IXGBE_MAX_RX_BURST] = {0};
@@ -443,6 +445,35 @@ ixgbe_recv_scattered_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
 		&split_flags[i]);
 }
 
+/**
+ * vPMD receive routine that reassembles scattered packets.
+ * Main receive routine that can handle arbitrary burst sizes
+ * Notice:
+ * - nb_pkts < RTE_IXGBE_DESCS_PER_LOOP, just return no packet
+ */
+uint16_t
+ixgbe_recv_scattered_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
+			      uint16_t nb_pkts)
+{
+	uint16_t retval = 0;
+
+	while (nb_pkts > RTE_IXGBE_MAX_RX_BURST) {
+		uint16_t burst;
+
+		burst = ixgbe_recv_scattered_burst_vec(rx_queue,
+						       rx_pkts + retval,
+						       RTE_IXGBE_MAX_RX_BURST);
+		retval += burst;
+		nb_pkts -= burst;
+		if (burst < RTE_IXGBE_MAX_RX_BURST)
+			return retval;
+	}
+
+	return retval + ixgbe_recv_scattered_burst_vec(rx_queue,
+						       rx_pkts + retval,
+						       nb_pkts);
+}
+
 static inline void
 vtx1(volatile union ixgbe_adv_tx_desc *txdp,
 		struct rte_mbuf *pkt, uint64_t flags)
diff --git a/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c b/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c
index 517ca3166..96b207f94 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c
@@ -302,13 +302,11 @@ desc_to_ptype_v(__m128i descs[4], uint16_t pkt_type_mask,
 		get_packet_type(3, pkt_info, etqf_check, tunnel_check);
 }
 
-/*
+/**
  * vPMD raw receive routine, only accept(nb_pkts >= RTE_IXGBE_DESCS_PER_LOOP)
  *
  * Notice:
  * - nb_pkts < RTE_IXGBE_DESCS_PER_LOOP, just return no packet
- * - nb_pkts > RTE_IXGBE_MAX_RX_BURST, only scan RTE_IXGBE_MAX_RX_BURST
- *   numbers of DD bit
  * - floor align nb_pkts to a RTE_IXGBE_DESC_PER_LOOP power-of-two
  */
 static inline uint16_t
@@ -344,9 +342,6 @@ _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts,
 	__m128i mbuf_init;
 	uint8_t vlan_flags;
 
-	/* nb_pkts shall be less equal than RTE_IXGBE_MAX_RX_BURST */
-	nb_pkts = RTE_MIN(nb_pkts, RTE_IXGBE_MAX_RX_BURST);
-
 	/* nb_pkts has to be floor-aligned to RTE_IXGBE_DESCS_PER_LOOP */
 	nb_pkts = RTE_ALIGN_FLOOR(nb_pkts, RTE_IXGBE_DESCS_PER_LOOP);
 
@@ -556,7 +551,7 @@ _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, struct rte_mbuf **rx_pkts,
 	return nb_pkts_recd;
 }
 
-/*
+/**
  * vPMD receive routine, only accept(nb_pkts >= RTE_IXGBE_DESCS_PER_LOOP)
  *
  * Notice:
@@ -572,18 +567,16 @@ ixgbe_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
 	return _recv_raw_pkts_vec(rx_queue, rx_pkts, nb_pkts, NULL);
 }
 
-/*
+/**
  * vPMD receive routine that reassembles scattered packets
  *
  * Notice:
  * - nb_pkts < RTE_IXGBE_DESCS_PER_LOOP, just return no packet
- * - nb_pkts > RTE_IXGBE_MAX_RX_BURST, only scan RTE_IXGBE_MAX_RX_BURST
- *   numbers of DD bit
  * - floor align nb_pkts to a RTE_IXGBE_DESC_PER_LOOP power-of-two
  */
-uint16_t
-ixgbe_recv_scattered_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
-		uint16_t nb_pkts)
+static uint16_t
+ixgbe_recv_scattered_burst_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
+			       uint16_t nb_pkts)
 {
 	struct ixgbe_rx_queue *rxq = rx_queue;
 	uint8_t split_flags[RTE_IXGBE_MAX_RX_BURST] = {0};
@@ -615,6 +608,35 @@ ixgbe_recv_scattered_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
 		&split_flags[i]);
 }
 
+/**
+ * vPMD receive routine that reassembles scattered packets.
+ * Main receive routine that can handle arbitrary burst sizes
+ * Notice:
+ * - nb_pkts < RTE_IXGBE_DESCS_PER_LOOP, just return no packet
+ */
+uint16_t
+ixgbe_recv_scattered_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
+			      uint16_t nb_pkts)
+{
+	uint16_t retval = 0;
+
+	while (nb_pkts > RTE_IXGBE_MAX_RX_BURST) {
+		uint16_t burst;
+
+		burst = ixgbe_recv_scattered_burst_vec(rx_queue,
+						       rx_pkts + retval,
+						       RTE_IXGBE_MAX_RX_BURST);
+		retval += burst;
+		nb_pkts -= burst;
+		if (burst < RTE_IXGBE_MAX_RX_BURST)
+			return retval;
+	}
+
+	return retval + ixgbe_recv_scattered_burst_vec(rx_queue,
+						       rx_pkts + retval,
+						       nb_pkts);
+}
+
 static inline void
 vtx1(volatile union ixgbe_adv_tx_desc *txdp,
 		struct rte_mbuf *pkt, uint64_t flags)
-- 
2.20.1