net/sched: mqprio: refactor nlattr parsing to a separate function

stable inclusion
from stable-v5.10.190
commit 6227b461542f19a21d78605e687f43a5f2477851
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I928UI

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=6227b461542f19a21d78605e687f43a5f2477851



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[ Upstream commit feb2cf3d ]

mqprio_init() is quite large and unwieldy to add more code to.
Split the netlink attribute parsing to a dedicated function.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 6c58c881 ("net/sched: mqprio: Add length check for TCA_MQPRIO_{MAX/MIN}_RATE64")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>