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net/smc: add comments for smc_link_{usable|sendable} 

Add comments for both smc_link_sendable() and smc_link_usable()
to help better distinguish and use them.

No function changes.

Signed-off-by: Dust Li <dust.li@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dust Li 2021-12-31 14:08:53 +08:00 committed by David S. Miller
parent c95e078069
commit 1f52a9380f
1 changed files with 16 additions and 1 deletions
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17
net/smc/smc_core.h
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@ -409,7 +409,13 @@ static inline struct smc_connection *smc_lgr_find_conn(
return res;
}
/* returns true if the specified link is usable */
/*
* Returns true if the specified link is usable.
*
* usable means the link is ready to receive RDMA messages, map memory
* on the link, etc. This doesn't ensure we are able to send RDMA messages
* on this link, if sending RDMA messages is needed, use smc_link_sendable()
*/
static inline bool smc_link_usable(struct smc_link *lnk)
{
if (lnk->state == SMC_LNK_UNUSED || lnk->state == SMC_LNK_INACTIVE)
@ -417,6 +423,15 @@ static inline bool smc_link_usable(struct smc_link *lnk)
return true;
}
/*
* Returns true if the specified link is ready to receive AND send RDMA
* messages.
*
* For the client side in first contact, the underlying QP may still in
* RESET or RTR when the link state is ACTIVATING, checks in smc_link_usable()
* is not strong enough. For those places that need to send any CDC or LLC
* messages, use smc_link_sendable(), otherwise, use smc_link_usable() instead
*/
static inline bool smc_link_sendable(struct smc_link *lnk)
{
return smc_link_usable(lnk) &&