[v6] net/i40e: fix vf runtime queues rss config

  I40evf queue can not work properly with kernel pf driver for X722 vf. 
Eg. when configure 8 queues pair, only 4 queues can receive packets, 
and half packets will be lost if using 2 queues pair.
This issue is caused by misconfiguration of look up table, the original
code of LUT configuration did not work for X722 vf, use aq command to 
setup the LUT to make it work properly.

Fixes: cea7a51c1750 ("i40evf: support RSS")
Cc: stable@dpdk.org

Signed-off-by: Xiao Zhang <xiao.zhang@intel.com>
---
v6 update commit message
v5 fix compile issue
v4 move local variable definition to the begin of the function
v3 move LUT configuration in to i40evf_configure_rss
v2 change for loop format to avoid build patch issue
---
 drivers/net/i40e/i40e_ethdev_vf.c | 32 ++++++++++++++++++++++++++------
 1 file changed, 26 insertions(+), 6 deletions(-)
  

On 08/14, Xiao Zhang wrote:
>I40evf queue can not work properly with kernel pf driver for X722 vf. 
>Eg. when configure 8 queues pair, only 4 queues can receive packets, 
>and half packets will be lost if using 2 queues pair.
>This issue is caused by misconfiguration of look up table, the original
>code of LUT configuration did not work for X722 vf, use aq command to 
>setup the LUT to make it work properly.
>
>Fixes: cea7a51c1750 ("i40evf: support RSS")
>Cc: stable@dpdk.org
>
>Signed-off-by: Xiao Zhang <xiao.zhang@intel.com>
>---
>v6 update commit message
>v5 fix compile issue
>v4 move local variable definition to the begin of the function
>v3 move LUT configuration in to i40evf_configure_rss
>v2 change for loop format to avoid build patch issue
>---
> drivers/net/i40e/i40e_ethdev_vf.c | 32 ++++++++++++++++++++++++++------
> 1 file changed, 26 insertions(+), 6 deletions(-)
>
>diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
>index 308fb98..c77b30c 100644
>--- a/drivers/net/i40e/i40e_ethdev_vf.c
>+++ b/drivers/net/i40e/i40e_ethdev_vf.c
>@@ -2598,7 +2598,10 @@ i40evf_config_rss(struct i40e_vf *vf)
> 	struct i40e_hw *hw = I40E_VF_TO_HW(vf);
> 	struct rte_eth_rss_conf rss_conf;
> 	uint32_t i, j, lut = 0, nb_q = (I40E_VFQF_HLUT_MAX_INDEX + 1) * 4;
>+	uint32_t rss_lut_size = (I40E_VFQF_HLUT1_MAX_INDEX + 1) * 4;
> 	uint16_t num;
>+	uint8_t *lut_info;
>+	int ret;
> 
> 	if (vf->dev_data->dev_conf.rxmode.mq_mode != ETH_MQ_RX_RSS) {
> 		i40evf_disable_rss(vf);
>@@ -2608,12 +2611,29 @@ i40evf_config_rss(struct i40e_vf *vf)
> 
> 	num = RTE_MIN(vf->dev_data->nb_rx_queues, I40E_MAX_QP_NUM_PER_VF);
> 	/* Fill out the look up table */
>-	for (i = 0, j = 0; i < nb_q; i++, j++) {
>-		if (j >= num)
>-			j = 0;
>-		lut = (lut << 8) | j;
>-		if ((i & 3) == 3)
>-			I40E_WRITE_REG(hw, I40E_VFQF_HLUT(i >> 2), lut);
>+	if (!(vf->flags & I40E_FLAG_RSS_AQ_CAPABLE)) {
>+		for (i = 0, j = 0; i < nb_q; i++, j++) {
>+			if (j >= num)
>+				j = 0;
>+			lut = (lut << 8) | j;
>+			if ((i & 3) == 3)
>+				I40E_WRITE_REG(hw, I40E_VFQF_HLUT(i >> 2), lut);
>+		}
>+	} else {
>+		lut_info = rte_zmalloc("i40e_rss_lut", rss_lut_size, 0);
>+		if (!lut_info) {
>+			PMD_DRV_LOG(ERR, "No memory can be allocated");
>+			return -ENOMEM;
>+		}
>+
>+		for (i = 0; i < rss_lut_size; i++)
>+			lut_info[i] = i % vf->num_queue_pairs;
>+
>+		ret = i40evf_set_rss_lut(&vf->vsi, lut_info,
>+					 rss_lut_size);
>+		rte_free(lut_info);
>+		if (ret)
>+			return ret;
> 	}
> 
> 	rss_conf = vf->dev_data->dev_conf.rx_adv_conf.rss_conf;
>-- 
>2.7.4
>

Applied to dpdk-next-net-intel with Beilei's ack.