[PATCH net-next 02/16] bnxt_en: Adjust default rings for multi-port NICs.

[Michael Chan]

Change the default ring logic to select default number of rings to be up to
8 per port if the default rings x NIC ports <= total CPUs.

Signed-off-by: Michael Chan <michael.c...@broadcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c 
b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 45d4532..82a3aad 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -8393,9 +8393,15 @@ static int bnxt_set_dflt_rings(struct bnxt *bp, bool sh)
        if (sh)
                bp->flags |= BNXT_FLAG_SHARED_RINGS;
        dflt_rings = netif_get_num_default_rss_queues();
-       /* Reduce default rings to reduce memory usage on multi-port cards */
-       if (bp->port_count > 1)
-               dflt_rings = min_t(int, dflt_rings, 4);
+       /* Reduce default rings on multi-port cards so that total default
+        * rings do not exceed CPU count.
+        */
+       if (bp->port_count > 1) {
+               int max_rings =
+                       max_t(int, num_online_cpus() / bp->port_count, 1);
+
+               dflt_rings = min_t(int, dflt_rings, max_rings);
+       }
        rc = bnxt_get_dflt_rings(bp, &max_rx_rings, &max_tx_rings, sh);
        if (rc)
                return rc;
-- 
1.8.3.1