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net/smc: add new link state and related helpers

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Before a link can be reused it must have been cleared. Lowest current
link state is INACTIVE, which does not mean that the link is already
cleared.
Add a new state UNUSED that is set when the link is cleared and can be
reused.
Add helper smc_llc_usable_link() to find an active link in a link group,
and smc_link_usable() to determine if a link is usable.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Graul
2020-04-29 17:10:43 +02:00
committed by David S. Miller
parent e07d31dc16
commit d854fcbfae
5 changed files with 42 additions and 20 deletions
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9
net/smc/smc_core.h
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@@ -32,6 +32,7 @@ enum smc_lgr_role { /* possible roles of a link group */
};
enum smc_link_state { /* possible states of a link */
SMC_LNK_UNUSED, /* link is unused */
SMC_LNK_INACTIVE, /* link is inactive */
SMC_LNK_ACTIVATING, /* link is being activated */
SMC_LNK_ACTIVE, /* link is active */
@@ -295,6 +296,14 @@ static inline struct smc_connection *smc_lgr_find_conn(
return res;
}
/* returns true if the specified link is usable */
static inline bool smc_link_usable(struct smc_link *lnk)
{
if (lnk->state == SMC_LNK_UNUSED || lnk->state == SMC_LNK_INACTIVE)
return false;
return true;
}
struct smc_sock;
struct smc_clc_msg_accept_confirm;
struct smc_clc_msg_local;