[dpdk-dev] [PATCH v2] net/i40e: adjust the RSS table

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

When starting the device, the RSS table is initialized. So the RSS
update before device_start would be overwitten. This patch allows users
to update the RSS reta table before device_start and adjusts the order
to set entries sequentially.

Signed-off-by: Xiaoyun Li <xiaoyun.li@intel.com>
---
v2:
 * Adds support to update RSS table before device_start.
 * Simplify the codes with rte_bswap32.
 * Polish the commit log.
---
 drivers/net/i40e/i40e_ethdev.c | 21 ++++++++++++++-------
 drivers/net/i40e/i40e_ethdev.h |  3 +++
 2 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 552a7a5..fea42b0 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -2444,6 +2444,8 @@ i40e_dev_stop(struct rte_eth_dev *dev)
 	pf->tm_conf.committed = false;
 
 	hw->adapter_stopped = 1;
+
+	pf->adapter->is_rss_reta_update = 0;
 }
 
 static void
@@ -4255,6 +4257,8 @@ i40e_dev_rss_reta_update(struct rte_eth_dev *dev,
 	}
 	ret = i40e_set_rss_lut(pf->main_vsi, lut, reta_size);
 
+	pf->adapter->is_rss_reta_update = 1;
+
 out:
 	rte_free(lut);
 
@@ -8492,13 +8496,16 @@ 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;
-		lut = (lut << 8) | (j & ((0x1 <<
-			hw->func_caps.rss_table_entry_width) - 1));
-		if ((i & 3) == 3)
-			I40E_WRITE_REG(hw, I40E_PFQF_HLUT(i >> 2), lut);
+	if (pf->adapter->is_rss_reta_update == 0) {
+		for (i = 0, j = 0; i < hw->func_caps.rss_table_size; i++, j++) {
+			if (j == num)
+				j = 0;
+			lut = (lut << 8) | (j & ((0x1 <<
+				hw->func_caps.rss_table_entry_width) - 1));
+			if ((i & 3) == 3)
+				I40E_WRITE_REG(hw, I40E_PFQF_HLUT(i >> 2),
+					       rte_bswap32(lut));
+		}
 	}
 
 	rss_conf = pf->dev_data->dev_conf.rx_adv_conf.rss_conf;
diff --git a/drivers/net/i40e/i40e_ethdev.h b/drivers/net/i40e/i40e_ethdev.h
index 11ecfc3..854aada 100644
--- a/drivers/net/i40e/i40e_ethdev.h
+++ b/drivers/net/i40e/i40e_ethdev.h
@@ -1081,6 +1081,9 @@ struct i40e_adapter {
 
 	/* For devargs */
 	uint8_t use_latest_vec;
+
+	/* For RSS reta table update */
+	uint8_t is_rss_reta_update;
 };
 
 /**
-- 
2.7.4