net/smc: add SMC-D shutdown signal
When a SMC-D link group is freed, a shutdown signal should be sent to the peer to indicate that the link group is invalid. This patch adds the shutdown signal to the SMC code. Signed-off-by: Hans Wippel <hwippel@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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