[dpdk-dev] [PATCH v2 5/5] net/fm10k: maximize vector rx burst for fm10k

[Jeff Guo]

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....@intel.com>
---
 drivers/net/fm10k/fm10k_rxtx_vec.c | 39 +++++++++++++++++++++++-------
 1 file changed, 30 insertions(+), 9 deletions(-)

diff --git a/drivers/net/fm10k/fm10k_rxtx_vec.c 
b/drivers/net/fm10k/fm10k_rxtx_vec.c
index eff3933b5..8d413b542 100644
--- a/drivers/net/fm10k/fm10k_rxtx_vec.c
+++ b/drivers/net/fm10k/fm10k_rxtx_vec.c
@@ -645,25 +645,20 @@ fm10k_reassemble_packets(struct fm10k_rx_queue *rxq,
        return pkt_idx;
 }
 
-/*
+/**
  * vPMD receive routine that reassembles 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};
        unsigned i = 0;
 
-       /* Split_flags only can support max of RTE_FM10K_MAX_RX_BURST */
-       nb_pkts = RTE_MIN(nb_pkts, RTE_FM10K_MAX_RX_BURST);
        /* get some new buffers */
        uint16_t nb_bufs = fm10k_recv_raw_pkts_vec(rxq, rx_pkts, nb_pkts,
                        split_flags);
@@ -691,6 +686,32 @@ 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