net/hns3: fix RSS indirection table configuration

For the current hns3 PMD driver, there are some RSS related bugs at
the following scenes:
1. Start the application with the number of Rx queues equals 1(--rxq=1),
   modify the number of Rx queue to some number greater than 1 during
   normal operation. As a result, upper application can't receive packets
   from multiple rx queues.
2. Start testpmd application with the option disable-rss and the number
   of Rx queue is greater than 1(--disable-rss --rxq=N, N>1). As a result,
   upper application still can receive packets from multiple rx queues.

The root cause as below:
There are some error configuration in the RSS indirection table of hns3
network engine.

This patch fixes them with the following modification.
1. When RSS size is changed, we need to update RSS redirection table
   maintained by driver and configure them to hardware. Besides, during
   the entire reset process, we need to ensure that the RSS table
   information are not overwritten and configured directly to the hardware
   in the RESET_STAGE_RESTORE stage of the reset process.
2. When sarting testpmd application with the options disable-rss, it
   doesn't need to configure RSS redirection table to hardware.

Fixes: c37ca66 ("net/hns3: support RSS")
Cc: stable@dpdk.org

Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>

drivers/net/hns3/hns3_dcb.c

@@ -580,7 +580,9 @@ hns3_dcb_pri_shaper_cfg(struct hns3_hw *hw)
 void
 hns3_set_rss_size(struct hns3_hw *hw, uint16_t nb_rx_q)
 {
+	struct hns3_rss_conf *rss_cfg = &hw->rss_info;
 	uint16_t rx_qnum_per_tc;
+	int i;
 
 	rx_qnum_per_tc = nb_rx_q / hw->num_tc;
 	rx_qnum_per_tc = RTE_MIN(hw->rss_size_max, rx_qnum_per_tc);
@@ -590,6 +592,19 @@ hns3_set_rss_size(struct hns3_hw *hw, uint16_t nb_rx_q)
 		hw->alloc_rss_size = rx_qnum_per_tc;
 	}
 	hw->used_rx_queues = hw->num_tc * hw->alloc_rss_size;
+
+	/*
+	 * When rss size is changed, we need to update rss redirection table
+	 * maintained by driver. Besides, during the entire reset process, we
+	 * need to ensure that the rss table information are not overwritten
+	 * and configured directly to the hardware in the RESET_STAGE_RESTORE
+	 * stage of the reset process.
+	 */
+	if (rte_atomic16_read(&hw->reset.resetting) == 0) {
+		for (i = 0; i < HNS3_RSS_IND_TBL_SIZE; i++)
+			rss_cfg->rss_indirection_tbl[i] =
+							i % hw->alloc_rss_size;
+	}
 }
 
 void

drivers/net/hns3/hns3_ethdev.c

@@ -4258,6 +4258,12 @@ hns3_map_rx_interrupt(struct rte_eth_dev *dev)
 	return ret;
 }
 
+static void
+hns3_restore_filter(struct rte_eth_dev *dev)
+{
+	hns3_restore_rss_filter(dev);
+}
+
 static int
 hns3_dev_start(struct rte_eth_dev *dev)
 {
@@ -4289,6 +4295,8 @@ hns3_dev_start(struct rte_eth_dev *dev)
 	hns3_mp_req_start_rxtx(dev);
 	rte_eal_alarm_set(HNS3_SERVICE_INTERVAL, hns3_service_handler, dev);
 
+	hns3_restore_filter(dev);
+
 	hns3_info(hw, "hns3 dev start successful!");
 	return 0;
 }

drivers/net/hns3/hns3_ethdev_vf.c

@@ -1744,6 +1744,12 @@ hns3vf_map_rx_interrupt(struct rte_eth_dev *dev)
 	return ret;
 }
 
+static void
+hns3vf_restore_filter(struct rte_eth_dev *dev)
+{
+	hns3_restore_rss_filter(dev);
+}
+
 static int
 hns3vf_dev_start(struct rte_eth_dev *dev)
 {
@@ -1773,6 +1779,8 @@ hns3vf_dev_start(struct rte_eth_dev *dev)
 	hns3_mp_req_start_rxtx(dev);
 	rte_eal_alarm_set(HNS3VF_SERVICE_INTERVAL, hns3vf_service_handler, dev);
 
+	hns3vf_restore_filter(dev);
+
 	return ret;
 }
 

drivers/net/hns3/hns3_flow.c

@@ -1546,6 +1546,19 @@ hns3_clear_rss_filter(struct rte_eth_dev *dev)
 	return hns3_config_rss_filter(dev, &hw->rss_info, false);
 }
 
+/* Restore the rss filter */
+int
+hns3_restore_rss_filter(struct rte_eth_dev *dev)
+{
+	struct hns3_adapter *hns = dev->data->dev_private;
+	struct hns3_hw *hw = &hns->hw;
+
+	if (hw->rss_info.conf.queue_num == 0)
+		return 0;
+
+	return hns3_config_rss_filter(dev, &hw->rss_info, true);
+}
+
 static int
 hns3_flow_parse_rss(struct rte_eth_dev *dev,
 		    const struct hns3_rss_conf *conf, bool add)

drivers/net/hns3/hns3_rss.c

@@ -127,7 +127,7 @@ hns3_set_rss_indir_table(struct hns3_hw *hw, uint8_t *indir, uint16_t size)
 		req->rss_set_bitmap = rte_cpu_to_le_16(HNS3_RSS_SET_BITMAP_MSK);
 		for (j = 0; j < HNS3_RSS_CFG_TBL_SIZE; j++) {
 			num = i * HNS3_RSS_CFG_TBL_SIZE + j;
-			req->rss_result[j] = indir[num] % hw->alloc_rss_size;
+			req->rss_result[j] = indir[num];
 		}
 		ret = hns3_cmd_send(hw, &desc, 1);
 		if (ret) {
@@ -423,7 +423,7 @@ hns3_dev_rss_reta_query(struct rte_eth_dev *dev,
 		shift = i % RTE_RETA_GROUP_SIZE;
 		if (reta_conf[idx].mask & (1ULL << shift))
 			reta_conf[idx].reta[shift] =
-			  rss_cfg->rss_indirection_tbl[i] % hw->alloc_rss_size;
+						rss_cfg->rss_indirection_tbl[i];
 	}
 	rte_spinlock_unlock(&hw->lock);
 	return 0;
@@ -532,7 +532,7 @@ hns3_config_rss(struct hns3_adapter *hns)
 
 	enum rte_eth_rx_mq_mode mq_mode = hw->data->dev_conf.rxmode.mq_mode;
 
-	/* When there is no open RSS, redirect the packet queue 0 */
+	/* When RSS is off, redirect the packet queue 0 */
 	if (((uint32_t)mq_mode & ETH_MQ_RX_RSS_FLAG) == 0)
 		hns3_rss_uninit(hns);
 
@@ -546,10 +546,16 @@ hns3_config_rss(struct hns3_adapter *hns)
 	if (ret)
 		return ret;
 
-	ret = hns3_set_rss_indir_table(hw, rss_cfg->rss_indirection_tbl,
-				       HNS3_RSS_IND_TBL_SIZE);
-	if (ret)
-		goto rss_tuple_uninit;
+	/*
+	 * When RSS is off, it doesn't need to configure rss redirection table
+	 * to hardware.
+	 */
+	if (((uint32_t)mq_mode & ETH_MQ_RX_RSS_FLAG)) {
+		ret = hns3_set_rss_indir_table(hw, rss_cfg->rss_indirection_tbl,
+					       HNS3_RSS_IND_TBL_SIZE);
+		if (ret)
+			goto rss_tuple_uninit;
+	}
 
 	ret = hns3_set_rss_tc_mode(hw);
 	if (ret)
@@ -558,9 +564,11 @@ hns3_config_rss(struct hns3_adapter *hns)
 	return ret;
 
 rss_indir_table_uninit:
-	ret1 = hns3_rss_reset_indir_table(hw);
-	if (ret1 != 0)
-		return ret;
+	if (((uint32_t)mq_mode & ETH_MQ_RX_RSS_FLAG)) {
+		ret1 = hns3_rss_reset_indir_table(hw);
+		if (ret1 != 0)
+			return ret;
+	}
 
 rss_tuple_uninit:
 	hns3_rss_tuple_uninit(hw);

drivers/net/hns3/hns3_rss.h

@@ -111,4 +111,6 @@ int hns3_set_rss_tuple_by_rss_hf(struct hns3_hw *hw,
 				 uint64_t rss_hf);
 int hns3_set_rss_algo_key(struct hns3_hw *hw, uint8_t hash_algo,
 			  const uint8_t *key);
+int hns3_restore_rss_filter(struct rte_eth_dev *dev);
+
 #endif /* _HNS3_RSS_H_ */