ice: report correct max number of TCs

stable inclusion
from stable-5.10.20
commit 4bee367264f126c47bfe19b0a8c58f543472ef6b
bugzilla: 50608

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

[ Upstream commit 7dcf7aa0 ]

In the driver currently, we are reporting max number of TCs
to the DCBNL callback as a kernel define set to 8.  This is
preventing userspace applications performing DCBx to correctly
down map the TCs from requested to actual values.

Report the actual max TC value to userspace from the capability
struct.

Fixes: b94b013e ("ice: Implement DCBNL support")
Signed-off-by: NDave Ertman <david.m.ertman@intel.com>
Tested-by: NTony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: NTony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/net/ethernet/intel/ice/ice_dcb_nl.c

@@ -136,7 +136,7 @@ ice_dcbnl_getnumtcs(struct net_device *dev, int __always_unused tcid, u8 *num)
 	if (!test_bit(ICE_FLAG_DCB_CAPABLE, pf->flags))
 		return -EINVAL;
 
-	*num = IEEE_8021QAZ_MAX_TCS;
+	*num = pf->hw.func_caps.common_cap.maxtc;
 	return 0;
 }