[dpdk-dev] [PATCH v5 4/5] net/fm10k: fix vector rx burst for fm10k

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

The scattered receive path should use a wrapper function to achieve the
goal of burst maximizing.

Bugzilla ID: 516
Fixes: fe65e1e1ce61 ("fm10k: add vector scatter Rx")

Signed-off-by: Jeff Guo <jia.guo@intel.com>
Acked-by: Morten Brørup <mb@smartsharesystems.com>
---
 drivers/net/fm10k/fm10k_rxtx_vec.c | 39 ++++++++++++++++++++++++------
 1 file changed, 31 insertions(+), 8 deletions(-)

diff --git a/drivers/net/fm10k/fm10k_rxtx_vec.c b/drivers/net/fm10k/fm10k_rxtx_vec.c
index eff3933b5c..6fcc939ad9 100644
--- a/drivers/net/fm10k/fm10k_rxtx_vec.c
+++ b/drivers/net/fm10k/fm10k_rxtx_vec.c
@@ -645,18 +645,15 @@ fm10k_reassemble_packets(struct fm10k_rx_queue *rxq,
 	return pkt_idx;
 }
 
-/*
- * vPMD receive routine that reassembles scattered packets
+/**
+ * vPMD receive routine that reassembles single burst of 32 scattered packets
  *
  * Notice:
  * - don't support ol_flags for rss and csum err
- * - nb_pkts > RTE_FM10K_MAX_RX_BURST, only scan RTE_FM10K_MAX_RX_BURST
- *   numbers of DD bit
  */
-uint16_t
-fm10k_recv_scattered_pkts_vec(void *rx_queue,
-				struct rte_mbuf **rx_pkts,
-				uint16_t nb_pkts)
+static uint16_t
+fm10k_recv_scattered_burst_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
+			       uint16_t nb_pkts)
 {
 	struct fm10k_rx_queue *rxq = rx_queue;
 	uint8_t split_flags[RTE_FM10K_MAX_RX_BURST] = {0};
@@ -691,6 +688,32 @@ fm10k_recv_scattered_pkts_vec(void *rx_queue,
 		&split_flags[i]);
 }
 
+/**
+ * vPMD receive routine that reassembles scattered packets.
+ */
+uint16_t
+fm10k_recv_scattered_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
+			      uint16_t nb_pkts)
+{
+	uint16_t retval = 0;
+
+	while (nb_pkts > RTE_FM10K_MAX_RX_BURST) {
+		uint16_t burst;
+
+		burst = fm10k_recv_scattered_burst_vec(rx_queue,
+						       rx_pkts + retval,
+						       RTE_FM10K_MAX_RX_BURST);
+		retval += burst;
+		nb_pkts -= burst;
+		if (burst < RTE_FM10K_MAX_RX_BURST)
+			return retval;
+	}
+
+	return retval + fm10k_recv_scattered_burst_vec(rx_queue,
+						       rx_pkts + retval,
+						       nb_pkts);
+}
+
 static const struct fm10k_txq_ops vec_txq_ops = {
 	.reset = fm10k_reset_tx_queue,
 };
-- 
2.20.1