[dpdk-dev] [PATCH] net/iavf: fix virtual channel RSS command error handling

[Alvin Zhang <alvinx.zhang@intel.com>]

Kernel PF may not respond to virtual channel commands
VIRTCHNL_OP_GET_RSS_HENA_CAPS and VIRTCHNL_OP_SET_RSS_HENA, which
will cause VF to fail to start.

RSS offload type configuration is not a necessary feature for VF,
so in order to improve VF compatibility, in this patch the PMD will
ignore the error result of above two commands and will print warnings
instead.

Fixes: 5a038d19962d ("net/iavf: fix RSS configuration on i40e VF")
Cc: stable@dpdk.org

Signed-off-by: Alvin Zhang <alvinx.zhang@intel.com>
---
 drivers/net/iavf/iavf_ethdev.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c
index 41382c6..162f55d 100644
--- a/drivers/net/iavf/iavf_ethdev.c
+++ b/drivers/net/iavf/iavf_ethdev.c
@@ -259,7 +259,7 @@ struct rte_iavf_xstats_name_off {
 	return err;
 }
 
-static int
+static void
 iavf_config_rss_hf(struct iavf_adapter *adapter, uint64_t rss_hf)
 {
 	static const uint64_t map_hena_rss[] = {
@@ -319,8 +319,12 @@ struct rte_iavf_xstats_name_off {
 	int ret;
 
 	ret = iavf_get_hena_caps(adapter, &caps);
-	if (ret)
-		return ret;
+	if (ret) {
+		PMD_DRV_LOG(WARNING,
+			    "fail to get supported RSS caps, lack PF support");
+		return;
+	}
+
 	/**
 	 * ETH_RSS_IPV4 and ETH_RSS_IPV6 can be considered as 2
 	 * generalizations of all other IPv4 and IPv6 RSS types.
@@ -343,8 +347,11 @@ struct rte_iavf_xstats_name_off {
 	}
 
 	ret = iavf_set_hena(adapter, hena);
-	if (ret)
-		return ret;
+	if (ret) {
+		PMD_DRV_LOG(WARNING,
+			    "fail to clean existing RSS, lack PF support");
+		return;
+	}
 
 	if (valid_rss_hf & ipv4_rss)
 		valid_rss_hf |= rss_hf & ETH_RSS_IPV4;
@@ -357,7 +364,6 @@ struct rte_iavf_xstats_name_off {
 			    rss_hf & ~valid_rss_hf);
 
 	vf->rss_hf = valid_rss_hf;
-	return 0;
 }
 
 static int
@@ -409,9 +415,7 @@ struct rte_iavf_xstats_name_off {
 			return ret;
 		}
 	} else {
-		ret = iavf_config_rss_hf(adapter, rss_conf->rss_hf);
-		if (ret != -ENOTSUP)
-			return ret;
+		iavf_config_rss_hf(adapter, rss_conf->rss_hf);
 	}
 
 	return 0;
@@ -1400,9 +1404,7 @@ static int iavf_config_rx_queues_irqs(struct rte_eth_dev *dev,
 			return ret;
 		}
 	} else {
-		ret = iavf_config_rss_hf(adapter, rss_conf->rss_hf);
-		if (ret != -ENOTSUP)
-			return ret;
+		iavf_config_rss_hf(adapter, rss_conf->rss_hf);
 	}
 
 	return 0;
-- 
1.8.3.1