From: Wenjun Wu <wenjun1.wu@intel.com>
Date: Mon, 15 Mar 2021 00:59:53 +0000 (+0800)
Subject: net/iavf: fix RSS hash update
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=e1a803ba43b99f4fb4e3f6212aea7b46c4ebf3e8;p=dpdk.git

net/iavf: fix RSS hash update

This patch change judgment statements to disable RSS for vf
when users need to disable RSS or RSS hash function configured
is not supported.

Fixes: 95f2f0e9fc2a ("net/iavf: improve default RSS")
Cc: stable@dpdk.org

Signed-off-by: Wenjun Wu <wenjun1.wu@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>
---

diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c
index 4d37722022..8610efba6d 100644
--- a/drivers/net/iavf/iavf_ethdev.c
+++ b/drivers/net/iavf/iavf_ethdev.c
@@ -1250,8 +1250,17 @@ iavf_dev_rss_hash_update(struct rte_eth_dev *dev,
 	if (ret)
 		return ret;
 
-	if (rss_conf->rss_hf == 0)
+	if (rss_conf->rss_hf == 0) {
+		vf->rss_hf = 0;
+		ret = iavf_set_hena(adapter, 0);
+
+		/* It is a workaround, temporarily allow error to be returned
+		 * due to possible lack of PF handling for hena = 0.
+		 */
+		if (ret)
+			PMD_DRV_LOG(WARNING, "fail to clean existing RSS, lack PF support");
 		return 0;
+	}
 
 	if (vf->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_ADV_RSS_PF) {
 		/* Clear existing RSS. */