From e9ff78f09278b62f184277357777ebec6b7ac0f2 Mon Sep 17 00:00:00 2001
From: Huisong Li <lihuisong@huawei.com>
Date: Fri, 10 Mar 2023 17:35:08 +0800
Subject: net/hns3: separate setting hash algorithm

[ upstream commit 1fcbef5ccb993b6028a3f8a68a7b01f9b8c67413 ]

Currently, the setting of hash algorithm comes from the
default configuration in driver and the rte_flow interface.
The hash algorithm that is set to hardware in both ways is
saved in hw->rss_info.conf.func.

But the 'func' in struct rte_flow_action_rss is usually used
in rte flow interface. And the ethdev ops interface may also
set hash algorithm in the future. It is not appropriate and
is a little messy for ethdev ops interface and driver default
configuration to use struct rte_flow_action_rss. So we have
to separate the RSS configuration from ethdev ops and rte
flow interface to make codes more easier to maintain.

This patch separates hash algorithm by following ways:
1) 'hash_algo' in struct hns3_rss_conf is used for ethdev ops
   interface or default configuration in driver.
2) Add a 'rte_flow_hash_algo' field in struct hns3_rss_conf
   to save algorithm from rte flow interface. The main reasons
   are as follows:
   Currently, only the last rule is used to restore the rte
   flow rule. If 'func' in RSS action is 'DEFAULT', it means
   that this rule doesn't modify algorithm and driver need to
   save current algorithm for restoring algorithm during reset
   phase.

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

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Signed-off-by: Dongdong Liu <liudongdong3@huawei.com>
---
 drivers/net/hns3/hns3_flow.c | 60 +++++++++++++++++++++---------------
 drivers/net/hns3/hns3_rss.c  | 14 +--------
 drivers/net/hns3/hns3_rss.h  |  1 +
 3 files changed, 37 insertions(+), 38 deletions(-)

diff --git a/drivers/net/hns3/hns3_flow.c b/drivers/net/hns3/hns3_flow.c
index e80ec0f053..0cb6914982 100644
--- a/drivers/net/hns3/hns3_flow.c
+++ b/drivers/net/hns3/hns3_flow.c
@@ -1438,30 +1438,40 @@ hns3_disable_rss(struct hns3_hw *hw)
 }
 
 static int
-hns3_parse_rss_algorithm(struct hns3_hw *hw, enum rte_eth_hash_function *func,
+hns3_parse_rss_algorithm(struct hns3_hw *hw, enum rte_eth_hash_function func,
 			 uint8_t *hash_algo)
 {
-	enum rte_eth_hash_function algo_func = *func;
-	switch (algo_func) {
-	case RTE_ETH_HASH_FUNCTION_DEFAULT:
-		/* Keep *hash_algo as what it used to be */
-		algo_func = hw->rss_info.conf.func;
-		break;
-	case RTE_ETH_HASH_FUNCTION_TOEPLITZ:
-		*hash_algo = HNS3_RSS_HASH_ALGO_TOEPLITZ;
-		break;
-	case RTE_ETH_HASH_FUNCTION_SIMPLE_XOR:
-		*hash_algo = HNS3_RSS_HASH_ALGO_SIMPLE;
-		break;
-	case RTE_ETH_HASH_FUNCTION_SYMMETRIC_TOEPLITZ:
-		*hash_algo = HNS3_RSS_HASH_ALGO_SYMMETRIC_TOEP;
-		break;
-	default:
-		hns3_err(hw, "Invalid RSS algorithm configuration(%d)",
-			 algo_func);
-		return -EINVAL;
+	const uint8_t hash_func_map[] = {
+		[RTE_ETH_HASH_FUNCTION_DEFAULT] = HNS3_RSS_HASH_ALGO_TOEPLITZ,
+		[RTE_ETH_HASH_FUNCTION_TOEPLITZ] = HNS3_RSS_HASH_ALGO_TOEPLITZ,
+		[RTE_ETH_HASH_FUNCTION_SIMPLE_XOR] = HNS3_RSS_HASH_ALGO_SIMPLE,
+		[RTE_ETH_HASH_FUNCTION_SYMMETRIC_TOEPLITZ] = HNS3_RSS_HASH_ALGO_SYMMETRIC_TOEP,
+	};
+	uint8_t key[HNS3_RSS_KEY_SIZE_MAX] = {0};
+	int ret;
+
+	if (func == RTE_ETH_HASH_FUNCTION_DEFAULT) {
+		ret = hns3_rss_get_algo_key(hw, hash_algo, key,
+					    hw->rss_key_size);
+		if (ret != 0) {
+			hns3_err(hw, "fail to get current RSS hash algorithm, ret = %d",
+				 ret);
+			return ret;
+		}
+
+		/*
+		 * During the phase of reset recovery, the hash algorithm
+		 * obtained from hardware may not be the one used(saved in
+		 * rte_flow_hash_algo) when this rule is delivered.
+		 */
+		if (__atomic_load_n(&hw->reset.resetting, __ATOMIC_RELAXED) &&
+		    *hash_algo != hw->rss_info.rte_flow_hash_algo)
+			*hash_algo = hw->rss_info.rte_flow_hash_algo;
+
+		return 0;
 	}
-	*func = algo_func;
+
+	*hash_algo = hash_func_map[func];
 
 	return 0;
 }
@@ -1471,6 +1481,7 @@ hns3_hw_rss_hash_set(struct hns3_hw *hw, struct rte_flow_action_rss *rss_config)
 {
 	uint8_t rss_key[HNS3_RSS_KEY_SIZE_MAX] = {0};
 	bool use_default_key = false;
+	uint8_t hash_algo;
 	int ret;
 
 	if (rss_config->key == NULL || rss_config->key_len != hw->rss_key_size) {
@@ -1480,18 +1491,17 @@ hns3_hw_rss_hash_set(struct hns3_hw *hw, struct rte_flow_action_rss *rss_config)
 		use_default_key = true;
 	}
 
-	ret = hns3_parse_rss_algorithm(hw, &rss_config->func,
-				       &hw->rss_info.hash_algo);
+	ret = hns3_parse_rss_algorithm(hw, rss_config->func, &hash_algo);
 	if (ret)
 		return ret;
 
-	ret = hns3_rss_set_algo_key(hw, hw->rss_info.hash_algo,
+	ret = hns3_rss_set_algo_key(hw, hash_algo,
 				    use_default_key ? rss_key : rss_config->key,
 				    hw->rss_key_size);
 	if (ret)
 		return ret;
 
-	hw->rss_info.conf.func = rss_config->func;
+	hw->rss_info.rte_flow_hash_algo = hash_algo;
 
 	ret = hns3_set_rss_tuple_by_rss_hf(hw, rss_config->types);
 	if (ret)
diff --git a/drivers/net/hns3/hns3_rss.c b/drivers/net/hns3/hns3_rss.c
index 7dc4e03d83..dcd42b554a 100644
--- a/drivers/net/hns3/hns3_rss.c
+++ b/drivers/net/hns3/hns3_rss.c
@@ -1022,7 +1022,7 @@ hns3_rss_set_default_args(struct hns3_hw *hw)
 	uint16_t i;
 
 	/* Default hash algorithm */
-	rss_cfg->conf.func = RTE_ETH_HASH_FUNCTION_TOEPLITZ;
+	rss_cfg->hash_algo = HNS3_RSS_HASH_ALGO_TOEPLITZ;
 
 	memcpy(rss_cfg->key, hns3_hash_key,
 		RTE_MIN(sizeof(hns3_hash_key), hw->rss_key_size));
@@ -1046,18 +1046,6 @@ hns3_config_rss(struct hns3_adapter *hns)
 
 	enum rte_eth_rx_mq_mode mq_mode = hw->data->dev_conf.rxmode.mq_mode;
 
-	switch (hw->rss_info.conf.func) {
-	case RTE_ETH_HASH_FUNCTION_SIMPLE_XOR:
-		hw->rss_info.hash_algo = HNS3_RSS_HASH_ALGO_SIMPLE;
-		break;
-	case RTE_ETH_HASH_FUNCTION_SYMMETRIC_TOEPLITZ:
-		hw->rss_info.hash_algo = HNS3_RSS_HASH_ALGO_SYMMETRIC_TOEP;
-		break;
-	default:
-		hw->rss_info.hash_algo = HNS3_RSS_HASH_ALGO_TOEPLITZ;
-		break;
-	}
-
 	ret = hns3_rss_set_algo_key(hw, rss_cfg->hash_algo,
 				    hash_key, hw->rss_key_size);
 	if (ret)
diff --git a/drivers/net/hns3/hns3_rss.h b/drivers/net/hns3/hns3_rss.h
index 17473e70e2..6e679b709b 100644
--- a/drivers/net/hns3/hns3_rss.h
+++ b/drivers/net/hns3/hns3_rss.h
@@ -42,6 +42,7 @@ struct hns3_rss_conf {
 	/* RSS parameters :algorithm, flow_types,  key, queue */
 	struct rte_flow_action_rss conf;
 	uint8_t hash_algo; /* hash function type defined by hardware */
+	uint8_t rte_flow_hash_algo;
 	uint8_t key[HNS3_RSS_KEY_SIZE_MAX];  /* Hash key */
 	uint16_t rss_indirection_tbl[HNS3_RSS_IND_TBL_SIZE_MAX];
 	uint16_t queue[HNS3_RSS_QUEUES_BUFFER_NUM]; /* Queues indices to use */
-- 
2.23.0