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tipc: add tipc_bearer_min_mtu to calculate min mtu
[ Upstream commit 3ae6d66 ] As different media may requires different min mtu, and even the same media with different net family requires different min mtu, add tipc_bearer_min_mtu() to calculate min mtu accordingly. This API will be used to check the new mtu when doing the link mtu negotiation in the next patch. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Stable-dep-of: 56077b5 ("tipc: do not update mtu if msg_max is too small in mtu negotiation") Signed-off-by: Sasha Levin <sashal@kernel.org>
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