From 87f9628e2c786dff500139baf59720693e46b0bc Mon Sep 17 00:00:00 2001
From: Huisong Li <lihuisong@huawei.com>
Date: Mon, 28 Feb 2022 11:21:46 +0800
Subject: [PATCH] net/hns3: fix VF RSS TC mode entry

For packets with VLAN priorities destined for the VF, hardware still
assign Rx queue based on the Up-to-TC mapping PF configured. But VF has
only one TC. If other TC don't enable, it causes that the priority
packets that aren't destined for TC0 aren't received by RSS hash but is
destined for queue 0. So driver has to enable the unused TC by using TC0
queue mapping configuration.

Fixes: c37ca66f2b27 ("net/hns3: support RSS")
Cc: stable@dpdk.org

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Acked-by: Min Hu (Connor) <humin29@huawei.com>
---
 drivers/net/hns3/hns3_rss.c | 56 +++++++++++++++++++++++++++----------
 1 file changed, 41 insertions(+), 15 deletions(-)

diff --git a/drivers/net/hns3/hns3_rss.c b/drivers/net/hns3/hns3_rss.c
index ebf3c60f07..1493b10f96 100644
--- a/drivers/net/hns3/hns3_rss.c
+++ b/drivers/net/hns3/hns3_rss.c
@@ -578,33 +578,59 @@ hns3_dev_rss_reta_query(struct rte_eth_dev *dev,
 	return 0;
 }
 
-/*
- * Used to configure the tc_size and tc_offset.
- */
+static void
+hns3_set_rss_tc_mode_entry(struct hns3_hw *hw, uint8_t *tc_valid,
+			   uint16_t *tc_size, uint16_t *tc_offset,
+			   uint8_t tc_num)
+{
+	struct hns3_adapter *hns = HNS3_DEV_HW_TO_ADAPTER(hw);
+	uint16_t rss_size = hw->alloc_rss_size;
+	uint16_t roundup_size;
+	uint16_t i;
+
+	roundup_size = roundup_pow_of_two(rss_size);
+	roundup_size = ilog2(roundup_size);
+
+	for (i = 0; i < tc_num; i++) {
+		if (hns->is_vf) {
+			/*
+			 * For packets with VLAN priorities destined for the VF,
+			 * hardware still assign Rx queue based on the Up-to-TC
+			 * mapping PF configured. But VF has only one TC. If
+			 * other TC don't enable, it causes that the priority
+			 * packets that aren't destined for TC0 aren't received
+			 * by RSS hash but is destined for queue 0. So driver
+			 * has to enable the unused TC by using TC0 queue
+			 * mapping configuration.
+			 */
+			tc_valid[i] = (hw->hw_tc_map & BIT(i)) ?
+					!!(hw->hw_tc_map & BIT(i)) : 1;
+			tc_size[i] = roundup_size;
+			tc_offset[i] = (hw->hw_tc_map & BIT(i)) ?
+					rss_size * i : 0;
+		} else {
+			tc_valid[i] = !!(hw->hw_tc_map & BIT(i));
+			tc_size[i] = tc_valid[i] ? roundup_size : 0;
+			tc_offset[i] = tc_valid[i] ? rss_size * i : 0;
+		}
+	}
+}
+
 static int
 hns3_set_rss_tc_mode(struct hns3_hw *hw)
 {
-	uint16_t rss_size = hw->alloc_rss_size;
 	struct hns3_rss_tc_mode_cmd *req;
 	uint16_t tc_offset[HNS3_MAX_TC_NUM];
 	uint8_t tc_valid[HNS3_MAX_TC_NUM];
 	uint16_t tc_size[HNS3_MAX_TC_NUM];
 	struct hns3_cmd_desc desc;
-	uint16_t roundup_size;
 	uint16_t i;
 	int ret;
 
-	req = (struct hns3_rss_tc_mode_cmd *)desc.data;
-
-	roundup_size = roundup_pow_of_two(rss_size);
-	roundup_size = ilog2(roundup_size);
-
-	for (i = 0; i < HNS3_MAX_TC_NUM; i++) {
-		tc_valid[i] = !!(hw->hw_tc_map & BIT(i));
-		tc_size[i] = tc_valid[i] ? roundup_size : 0;
-		tc_offset[i] = tc_valid[i] ? rss_size * i : 0;
-	}
+	hns3_set_rss_tc_mode_entry(hw, tc_valid, tc_size,
+				   tc_offset, HNS3_MAX_TC_NUM);
 
+	req = (struct hns3_rss_tc_mode_cmd *)desc.data;
 	hns3_cmd_setup_basic_desc(&desc, HNS3_OPC_RSS_TC_MODE, false);
 	for (i = 0; i < HNS3_MAX_TC_NUM; i++) {
 		uint16_t mode = 0;
-- 
2.33.0