net: hns3: fix VF RSS failed problem after PF enable multi-TCs

mainline inclusion
from mainline-v5.16-rc3
commit 8d2ad993
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4M1HB
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8d2ad993aa05

----------------------------------------------------------------------

When PF is set to multi-TCs and configured mapping relationship between
priorities and TCs, the hardware will active these settings for this PF
and its VFs.

In this case when VF just uses one TC and its rx packets contain priority,
and if the priority is not mapped to TC0, as other TCs of VF is not valid,
hardware always put this kind of packets to the queue 0. It cause this kind
of packets of VF can not be used RSS function.

To fix this problem, set tc mode of all unused TCs of VF to the setting of
TC0, then rx packet with priority which map to unused TC will be direct to
TC0.

Fixes: e2cb1dec ("net: hns3: Add HNS3 VF HCL(Hardware Compatibility Layer) Support")
Signed-off-by: NGuangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>
Reviewed-by: NYongxin Li <liyongxin1@huawei.com>
Signed-off-by: NJunxin Chen <chenjunxin1@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

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

@@ -703,9 +703,9 @@ static int hclgevf_set_rss_tc_mode(struct hclgevf_dev *hdev,  u16 rss_size)
 	roundup_size = ilog2(roundup_size);
 
 	for (i = 0; i < HCLGEVF_MAX_TC_NUM; i++) {
-		tc_valid[i] = !!(hdev->hw_tc_map & BIT(i));
+		tc_valid[i] = 1;
 		tc_size[i] = roundup_size;
-		tc_offset[i] = rss_size * i;
+		tc_offset[i] = (hdev->hw_tc_map & BIT(i)) ? rss_size * i : 0;
 	}
 
 	hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_RSS_TC_MODE, false);