net/smc: switch connections to alternate link
Add smc_switch_conns() to switch all connections from a link that is
going down. Find an other link to switch the connections to, and
switch each connection to the new link. smc_switch_cursor() updates the
cursors of a connection to the state of the last successfully sent CDC
message. When there is no link to switch to, terminate the link group.
Call smc_switch_conns() when a link is going down.
And with the possibility that links of connections can switch adapt CDC
and TX functions to detect and handle link switches.
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>
diff --git a/net/smc/smc_llc.c b/net/smc/smc_llc.c
index 7675ccd..8d2368a 100644
--- a/net/smc/smc_llc.c
+++ b/net/smc/smc_llc.c
@@ -933,7 +933,7 @@ static void smc_llc_delete_asym_link(struct smc_link_group *lgr)
return; /* no asymmetric link */
if (!smc_link_downing(&lnk_asym->state))
return;
- /* tbd: lnk_new = smc_switch_conns(lgr, lnk_asym, false); */
+ lnk_new = smc_switch_conns(lgr, lnk_asym, false);
smc_wr_tx_wait_no_pending_sends(lnk_asym);
if (!lnk_new)
goto out_free;
@@ -1195,7 +1195,7 @@ static void smc_llc_process_cli_delete_link(struct smc_link_group *lgr)
smc_llc_send_message(lnk, &qentry->msg); /* response */
if (smc_link_downing(&lnk_del->state)) {
- /* tbd: call smc_switch_conns(lgr, lnk_del, false); */
+ smc_switch_conns(lgr, lnk_del, false);
smc_wr_tx_wait_no_pending_sends(lnk_del);
}
smcr_link_clear(lnk_del);
@@ -1245,7 +1245,7 @@ static void smc_llc_process_srv_delete_link(struct smc_link_group *lgr)
goto out; /* asymmetric link already deleted */
if (smc_link_downing(&lnk_del->state)) {
- /* tbd: call smc_switch_conns(lgr, lnk_del, false); */
+ smc_switch_conns(lgr, lnk_del, false);
smc_wr_tx_wait_no_pending_sends(lnk_del);
}
if (!list_empty(&lgr->list)) {
