net/sfc: support more options for a number of Rx descriptors

[dpdk.git] / drivers / net / sfc / sfc_ef10_rx.c

diff --git a/drivers/net/sfc/sfc_ef10_rx.c b/drivers/net/sfc/sfc_ef10_rx.c
index ad84629..b651bd7 100644 (file)
--- a/drivers/net/sfc/sfc_ef10_rx.c
+++ b/drivers/net/sfc/sfc_ef10_rx.c
@@ -638,6 +638,19 @@ sfc_ef10_rx_qdesc_status(__rte_unused struct sfc_dp_rxq *dp_rxq,
 }
 
 
+static sfc_dp_rx_get_dev_info_t sfc_ef10_rx_get_dev_info;
+static void
+sfc_ef10_rx_get_dev_info(struct rte_eth_dev_info *dev_info)
+{
+       /*
+        * Number of descriptors just defines maximum number of pushed
+        * descriptors (fill level).
+        */
+       dev_info->rx_desc_lim.nb_min = SFC_RX_REFILL_BULK;
+       dev_info->rx_desc_lim.nb_align = SFC_RX_REFILL_BULK;
+}
+
+
 static sfc_dp_rx_qsize_up_rings_t sfc_ef10_rx_qsize_up_rings;
 static int
 sfc_ef10_rx_qsize_up_rings(uint16_t nb_rx_desc,
@@ -645,9 +658,19 @@ sfc_ef10_rx_qsize_up_rings(uint16_t nb_rx_desc,
                           unsigned int *evq_entries,
                           unsigned int *rxq_max_fill_level)
 {
-       *rxq_entries = nb_rx_desc;
-       *evq_entries = nb_rx_desc;
-       *rxq_max_fill_level = SFC_EF10_RXQ_LIMIT(*rxq_entries);
+       /*
+        * rte_ethdev API guarantees that the number meets min, max and
+        * alignment requirements.
+        */
+       if (nb_rx_desc <= EFX_RXQ_MINNDESCS)
+               *rxq_entries = EFX_RXQ_MINNDESCS;
+       else
+               *rxq_entries = rte_align32pow2(nb_rx_desc);
+
+       *evq_entries = *rxq_entries;
+
+       *rxq_max_fill_level = RTE_MIN(nb_rx_desc,
+                                     SFC_EF10_RXQ_LIMIT(*evq_entries));
        return 0;
 }
 
@@ -809,6 +832,7 @@ struct sfc_dp_rx sfc_ef10_rx = {
        },
        .features               = SFC_DP_RX_FEAT_MULTI_PROCESS |
                                  SFC_DP_RX_FEAT_TUNNELS,
+       .get_dev_info           = sfc_ef10_rx_get_dev_info,
        .qsize_up_rings         = sfc_ef10_rx_qsize_up_rings,
        .qcreate                = sfc_ef10_rx_qcreate,
        .qdestroy               = sfc_ef10_rx_qdestroy,