diff options
| author | Dust Li <dust.li@linux.alibaba.com> | 2021-12-31 14:08:53 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-01-02 16:08:38 +0000 |
| commit | 1f52a9380ff19b6fc00c1614488d5940773ba3ab (patch) | |
| tree | c16273c298548134fac3831d82f4433dd3eae4a3 | |
| parent | c95e078069bf9bfcb66272fac162c79be6c9170b (diff) | |
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>
| -rw-r--r-- | net/smc/smc_core.h | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h index 1e4e90faf657..e778f97da700 100644 --- a/net/smc/smc_core.h +++ b/net/smc/smc_core.h @@ -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) && |