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net/smc: prevent new connections on link group

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When the processing of a DELETE LINK message has started,
new connections should not be added to the link group that
is about to terminate.

Signed-off-by: Karsten Graul <kgraul@linux.vnet.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Graul 2018-03-01 13:51:33 +01:00 committed by David S. Miller
parent 52bedf37ba
commit 9651b9346f
4 changed files with 12 additions and 18 deletions
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9
net/smc/af_smc.c
View File

@ -356,15 +356,6 @@ static void smc_link_save_peer_info(struct smc_link *link,
link->peer_mtu = clc->qp_mtu;
}
static void smc_lgr_forget(struct smc_link_group *lgr)
{
spin_lock_bh(&smc_lgr_list.lock);
/* do not use this link group for new connections */
if (!list_empty(&lgr->list))
list_del_init(&lgr->list);
spin_unlock_bh(&smc_lgr_list.lock);
}
/* setup for RDMA connection of client */
static int smc_connect_rdma(struct smc_sock *smc)
{

19
net/smc/smc_core.c
View File

@ -308,6 +308,15 @@ void smc_lgr_free(struct smc_link_group *lgr)
kfree(lgr);
}
void smc_lgr_forget(struct smc_link_group *lgr)
{
spin_lock_bh(&smc_lgr_list.lock);
/* do not use this link group for new connections */
if (!list_empty(&lgr->list))
list_del_init(&lgr->list);
spin_unlock_bh(&smc_lgr_list.lock);
}
/* terminate linkgroup abnormally */
void smc_lgr_terminate(struct smc_link_group *lgr)
{
@ -315,15 +324,7 @@ void smc_lgr_terminate(struct smc_link_group *lgr)
struct smc_sock *smc;
struct rb_node *node;
spin_lock_bh(&smc_lgr_list.lock);
if (list_empty(&lgr->list)) {
/* termination already triggered */
spin_unlock_bh(&smc_lgr_list.lock);
return;
}
/* do not use this link group for new connections */
list_del_init(&lgr->list);
spin_unlock_bh(&smc_lgr_list.lock);
smc_lgr_forget(lgr);
write_lock_bh(&lgr->conns_lock);
node = rb_first(&lgr->conns_all);

1
net/smc/smc_core.h
View File

@ -197,6 +197,7 @@ struct smc_sock;
struct smc_clc_msg_accept_confirm;
void smc_lgr_free(struct smc_link_group *lgr);
void smc_lgr_forget(struct smc_link_group *lgr);
void smc_lgr_terminate(struct smc_link_group *lgr);
int smc_buf_create(struct smc_sock *smc);
int smc_rmb_rtoken_handling(struct smc_connection *conn,

1
net/smc/smc_llc.c
View File

@ -384,6 +384,7 @@ static void smc_llc_rx_delete_link(struct smc_link *link,
smc_lgr_terminate(lgr);
} else {
if (lgr->role == SMC_SERV) {
smc_lgr_forget(lgr);
smc_llc_send_delete_link(link, SMC_LLC_REQ);
} else {
smc_llc_send_delete_link(link, SMC_LLC_RESP);