From: Magnus Karlsson <magnus.karlsson@intel.com>
Date: Mon, 28 Mar 2022 16:21:21 +0200
Subject: ice: xsk: Eliminate unnecessary loop iteration
Patch-mainline: v5.18-rc1
Git-commit: 30d19d57d513821c58de4556e7445982ed22b923
References: jsc#PED-376

The NIC Tx ring completion routine cleans entries from the ring in
batches. However, it processes one more batch than it is supposed
to. Note that this does not matter from a functionality point of view
since it will not find a set DD bit for the next batch and just exit
the loop. But from a performance perspective, it is faster to
terminate the loop before and not issue an expensive read over PCIe to
get the DD bit.

Fixes: 126cdfe1007a ("ice: xsk: Improve AF_XDP ZC Tx and use batching API")
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220328142123.170157-3-maciej.fijalkowski@intel.com
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/ice/ice_xsk.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -754,7 +754,7 @@ skip:
 		next_dd = next_dd + tx_thresh;
 		if (next_dd >= desc_cnt)
 			next_dd = tx_thresh - 1;
-	} while (budget--);
+	} while (--budget);
 
 	xdp_ring->next_dd = next_dd;