[dpdk-dev] [PATCH 02/11] net/bnxt: compute and store scattered RX status

[Ajit Khaparde]

From: Lance Richardson <lance.richard...@broadcom.com>

In preparation for a bnxt vector-mode driver, compute and store
scattered_rx status for the device when started.

Signed-off-by: Lance Richardson <lance.richard...@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khapa...@broadcom.com>
---
 drivers/net/bnxt/bnxt_ethdev.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/net/bnxt/bnxt_ethdev.c b/drivers/net/bnxt/bnxt_ethdev.c
index da0de211d..e0e0b72c6 100644
--- a/drivers/net/bnxt/bnxt_ethdev.c
+++ b/drivers/net/bnxt/bnxt_ethdev.c
@@ -624,6 +624,27 @@ static int bnxt_dev_lsc_intr_setup(struct rte_eth_dev 
*eth_dev)
        return 0;
 }
 
+/*
+ * Determine whether the current configuration requires support for scattered
+ * receive; return 1 if scattered receive is required and 0 if not.
+ */
+static int bnxt_scattered_rx(struct rte_eth_dev *eth_dev)
+{
+       uint16_t buf_size;
+       int i;
+
+       for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
+               struct bnxt_rx_queue *rxq = eth_dev->data->rx_queues[i];
+
+               buf_size = (uint16_t)(rte_pktmbuf_data_room_size(rxq->mb_pool) -
+                                     RTE_PKTMBUF_HEADROOM);
+               if (eth_dev->data->dev_conf.rxmode.max_rx_pkt_len +
+                   VLAN_TAG_SIZE * BNXT_NUM_VLANS > buf_size)
+                       return 1;
+       }
+       return 0;
+}
+
 static int bnxt_dev_start_op(struct rte_eth_dev *eth_dev)
 {
        struct bnxt *bp = (struct bnxt *)eth_dev->data->dev_private;
@@ -642,6 +663,8 @@ static int bnxt_dev_start_op(struct rte_eth_dev *eth_dev)
        if (rc)
                goto error;
 
+       eth_dev->data->scattered_rx = bnxt_scattered_rx(eth_dev);
+
        bnxt_link_update_op(eth_dev, 1);
 
        if (rx_offloads & DEV_RX_OFFLOAD_VLAN_FILTER)
-- 
2.20.1 (Apple Git-117)