net: hns3: fix RSS config lost after VF reset.

Currently, VF's RSS configuration would be set to default
after VF reset, the the user's one will loss.

To fix it, this patch separates hclgevf_rss_init_hw() into
two parts, one sets up the default RSS configuration and
just be called when driver loading, one configures the hardware
and be called by driver loading or reset.

Fixes: d97b307 ("net: hns3: Add RSS tuples support for VF")
Signed-off-by: Guojia Liao <liaoguojia@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Guojia Liao

drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c

@@ -2124,50 +2124,51 @@ static int hclgevf_config_gro(struct hclgevf_dev *hdev, bool en)
 	return ret;
 }
 
-static int hclgevf_rss_init_hw(struct hclgevf_dev *hdev)
+static void hclgevf_rss_init_cfg(struct hclgevf_dev *hdev)
 {
 	struct hclgevf_rss_cfg *rss_cfg = &hdev->rss_cfg;
-	int ret;
+	struct hclgevf_rss_tuple_cfg *tuple_sets;
 	u32 i;
 
+	rss_cfg->hash_algo = HCLGEVF_RSS_HASH_ALGO_TOEPLITZ;
 	rss_cfg->rss_size = hdev->nic.kinfo.rss_size;
-
+	tuple_sets = &rss_cfg->rss_tuple_sets;
 	if (hdev->pdev->revision >= 0x21) {
 		rss_cfg->hash_algo = HCLGEVF_RSS_HASH_ALGO_SIMPLE;
 		memcpy(rss_cfg->rss_hash_key, hclgevf_hash_key,
 		       HCLGEVF_RSS_KEY_SIZE);
 
+		tuple_sets->ipv4_tcp_en = HCLGEVF_RSS_INPUT_TUPLE_OTHER;
+		tuple_sets->ipv4_udp_en = HCLGEVF_RSS_INPUT_TUPLE_OTHER;
+		tuple_sets->ipv4_sctp_en = HCLGEVF_RSS_INPUT_TUPLE_SCTP;
+		tuple_sets->ipv4_fragment_en = HCLGEVF_RSS_INPUT_TUPLE_OTHER;
+		tuple_sets->ipv6_tcp_en = HCLGEVF_RSS_INPUT_TUPLE_OTHER;
+		tuple_sets->ipv6_udp_en = HCLGEVF_RSS_INPUT_TUPLE_OTHER;
+		tuple_sets->ipv6_sctp_en = HCLGEVF_RSS_INPUT_TUPLE_SCTP;
+		tuple_sets->ipv6_fragment_en = HCLGEVF_RSS_INPUT_TUPLE_OTHER;
+	}
+
+	/* Initialize RSS indirect table */
+	for (i = 0; i < HCLGEVF_RSS_IND_TBL_SIZE; i++)
+		rss_cfg->rss_indirection_tbl[i] = i % rss_cfg->rss_size;
+}
+
+static int hclgevf_rss_init_hw(struct hclgevf_dev *hdev)
+{
+	struct hclgevf_rss_cfg *rss_cfg = &hdev->rss_cfg;
+	int ret;
+
+	if (hdev->pdev->revision >= 0x21) {
 		ret = hclgevf_set_rss_algo_key(hdev, rss_cfg->hash_algo,
 					       rss_cfg->rss_hash_key);
 		if (ret)
 			return ret;
 
-		rss_cfg->rss_tuple_sets.ipv4_tcp_en =
-					HCLGEVF_RSS_INPUT_TUPLE_OTHER;
-		rss_cfg->rss_tuple_sets.ipv4_udp_en =
-					HCLGEVF_RSS_INPUT_TUPLE_OTHER;
-		rss_cfg->rss_tuple_sets.ipv4_sctp_en =
-					HCLGEVF_RSS_INPUT_TUPLE_SCTP;
-		rss_cfg->rss_tuple_sets.ipv4_fragment_en =
-					HCLGEVF_RSS_INPUT_TUPLE_OTHER;
-		rss_cfg->rss_tuple_sets.ipv6_tcp_en =
-					HCLGEVF_RSS_INPUT_TUPLE_OTHER;
-		rss_cfg->rss_tuple_sets.ipv6_udp_en =
-					HCLGEVF_RSS_INPUT_TUPLE_OTHER;
-		rss_cfg->rss_tuple_sets.ipv6_sctp_en =
-					HCLGEVF_RSS_INPUT_TUPLE_SCTP;
-		rss_cfg->rss_tuple_sets.ipv6_fragment_en =
-					HCLGEVF_RSS_INPUT_TUPLE_OTHER;
-
 		ret = hclgevf_set_rss_input_tuple(hdev, rss_cfg);
 		if (ret)
 			return ret;
 	}
 
-	/* Initialize RSS indirect table */
-	for (i = 0; i < HCLGEVF_RSS_IND_TBL_SIZE; i++)
-		rss_cfg->rss_indirection_tbl[i] = i % rss_cfg->rss_size;
-
 	ret = hclgevf_set_rss_indir_table(hdev);
 	if (ret)
 		return ret;
@@ -2764,6 +2765,7 @@ static int hclgevf_init_hdev(struct hclgevf_dev *hdev)
 		goto err_config;
 
 	/* Initialize RSS for this VF */
+	hclgevf_rss_init_cfg(hdev);
 	ret = hclgevf_rss_init_hw(hdev);
 	if (ret) {
 		dev_err(&hdev->pdev->dev,
@@ -2936,6 +2938,8 @@ static int hclgevf_set_channels(struct hnae3_handle *handle, u32 new_tqps_num,
 	for (i = 0; i < HCLGEVF_RSS_IND_TBL_SIZE; i++)
 		rss_indir[i] = i % kinfo->rss_size;
 
+	hdev->rss_cfg.rss_size = kinfo->rss_size;
+
 	ret = hclgevf_set_rss(handle, rss_indir, NULL, 0);
 	if (ret)
 		dev_err(&hdev->pdev->dev, "set rss indir table fail, ret=%d\n",