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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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4
net/smc/smc_llc.c
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@@ -372,7 +372,7 @@ static void smc_llc_send_message_work(struct work_struct *work)
struct smc_wr_buf *wr_buf;
int rc;
if (llcwrk->link->state == SMC_LNK_INACTIVE)
if (!smc_link_usable(llcwrk->link))
goto out;
rc = smc_llc_add_pending_send(llcwrk->link, &wr_buf, &pend);
if (rc)
@@ -562,7 +562,7 @@ static void smc_llc_rx_handler(struct ib_wc *wc, void *buf)
return; /* short message */
if (llc->raw.hdr.length != sizeof(*llc))
return; /* invalid message */
if (link->state == SMC_LNK_INACTIVE)
if (!smc_link_usable(link))
return; /* link not active, drop msg */
switch (llc->raw.hdr.common.type) {