[dpdk-dev] [PATCH] net/i40e: adjust the RSS table

[Xiaoyun Li <xiaoyun.li@intel.com>]

When starting the device, the RSS table is set. For 8 queues, the RSS hash
table would be like | 3,2,1,0,7,6,5,4 | 3,2,1,0,7,6,5,4 |... This patch
adjusts this table to set entries sequentially. Then for 8 queues, the
RSS table would be like | 0,1,2,3,4,5,6,7 | 0,1,2,3,4,5,6,7 |...

Signed-off-by: Xiaoyun Li <xiaoyun.li@intel.com>
---
 drivers/net/i40e/i40e_ethdev.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 790ecc3..031eba0 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -8468,6 +8468,7 @@ i40e_pf_config_rss(struct i40e_pf *pf)
 {
 	struct i40e_hw *hw = I40E_PF_TO_HW(pf);
 	struct rte_eth_rss_conf rss_conf;
+	uint32_t size = hw->func_caps.rss_table_size;
 	uint32_t i, lut = 0;
 	uint16_t j, num;
 
@@ -8489,13 +8490,17 @@ i40e_pf_config_rss(struct i40e_pf *pf)
 		return -ENOTSUP;
 	}
 
-	for (i = 0, j = 0; i < hw->func_caps.rss_table_size; i++, j++) {
-		if (j == num)
-			j = 0;
+	for (i = size - 1, j = (size - 1) % num;; i--, j--) {
 		lut = (lut << 8) | (j & ((0x1 <<
-			hw->func_caps.rss_table_entry_width) - 1));
-		if ((i & 3) == 3)
+		      hw->func_caps.rss_table_entry_width) - 1));
+
+		if (j == 0)
+			j = num;
+
+		if ((i & 3) == 0)
 			I40E_WRITE_REG(hw, I40E_PFQF_HLUT(i >> 2), lut);
+		if (i == 0)
+			break;
 	}
 
 	rss_conf = pf->dev_data->dev_conf.rx_adv_conf.rss_conf;
-- 
2.7.4