[PATCH 02/16] net/hns3: fix possible truncation of redirection table

[Dongdong Liu <liudongdong3@huawei.com>]

From: Huisong Li <lihuisong@huawei.com>

The size of the redirection table is obtained from firmware. If the size
isn't a multiple of HNS3_RSS_CFG_TBL_SIZE, the redirection table from
user will be truncated.

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_rss.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/net/hns3/hns3_rss.c b/drivers/net/hns3/hns3_rss.c
index 2011c18b9b..f6d677ade8 100644
--- a/drivers/net/hns3/hns3_rss.c
+++ b/drivers/net/hns3/hns3_rss.c
@@ -329,22 +329,28 @@ int
 hns3_set_rss_indir_table(struct hns3_hw *hw, uint16_t *indir, uint16_t size)
 {
 	struct hns3_rss_indirection_table_cmd *req;
+	uint16_t max_bd_num, cfg_tbl_size;
+	uint8_t qid_msb_off, qid_msb_val;
 	struct hns3_cmd_desc desc;
-	uint8_t qid_msb_off;
-	uint8_t qid_msb_val;
 	uint16_t q_id;
 	uint16_t i, j;
 	int ret;
 
 	req = (struct hns3_rss_indirection_table_cmd *)desc.data;
-
-	for (i = 0; i < size / HNS3_RSS_CFG_TBL_SIZE; i++) {
+	max_bd_num = DIV_ROUND_UP(size, HNS3_RSS_CFG_TBL_SIZE);
+	for (i = 0; i < max_bd_num; i++) {
 		hns3_cmd_setup_basic_desc(&desc, HNS3_OPC_RSS_INDIR_TABLE,
 					  false);
 		req->start_table_index =
 				rte_cpu_to_le_16(i * HNS3_RSS_CFG_TBL_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++) {
+
+		if (i == max_bd_num - 1 && (size % HNS3_RSS_CFG_TBL_SIZE) != 0)
+			cfg_tbl_size = size % HNS3_RSS_CFG_TBL_SIZE;
+		else
+			cfg_tbl_size = HNS3_RSS_CFG_TBL_SIZE;
+
+		for (j = 0; j < cfg_tbl_size; j++) {
 			q_id = indir[i * HNS3_RSS_CFG_TBL_SIZE + j];
 			req->rss_result_l[j] = q_id & 0xff;
 
-- 
2.22.0