From 43ebecdf60f09982ba67af0dd043b697f139972e Mon Sep 17 00:00:00 2001
From: "Chen, You" <you.chen@intel.com>
Date: Fri, 15 Jul 2022 23:56:57 +0800
Subject: [PATCH] lib/idxd: break spdk_idxd_process_events loop after
 processing DESC_PER_BATCH ops

To prevent the processing of outstanding commands from starving the rest of the system

Fixes: #2586

Signed-off-by: Chen, You <you.chen@intel.com>
Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Change-Id: I392db2359408cdef32cc1f46b76ecd94f0c3332c
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/13685
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Dong Yi <dongx.yi@intel.com>
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
---
 lib/idxd/idxd.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/idxd/idxd.c b/lib/idxd/idxd.c
index d94bd39f1..9db2d9723 100644
--- a/lib/idxd/idxd.c
+++ b/lib/idxd/idxd.c
@@ -1397,6 +1397,10 @@ spdk_idxd_process_events(struct spdk_idxd_io_channel *chan)
 
 		/* reset the status */
 		status = 0;
+		/* break the processing loop to prevent from starving the rest of the system */
+		if (rc > DESC_PER_BATCH) {
+			break;
+		}
 	}
 
 	/* Submit any built-up batch */