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net/smc: abnormal termination of SMCD link groups

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A final cleanup due to SMCD device removal means immediate freeing
of all link groups belonging to this device in interrupt context.

This patch introduces a separate SMCD link group termination routine,
which terminates all link groups of an SMCD device.

This new routine smcd_terminate_all ()is reused if the smc module is
unloaded.

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2019-11-14 13:02:42 +01:00 committed by David S. Miller
parent 42bfba9eaa
commit 5421ec281d
6 changed files with 57 additions and 21 deletions
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2
net/smc/smc_clc.c
View File

@ -349,7 +349,7 @@ int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
smc->peer_diagnosis = ntohl(dclc->peer_diagnosis);
if (((struct smc_clc_msg_decline *)buf)->hdr.flag) {
smc->conn.lgr->sync_err = 1;
smc_lgr_terminate(smc->conn.lgr);
smc_lgr_terminate(smc->conn.lgr, true);
}
}

67
net/smc/smc_core.c
View File

@ -224,7 +224,7 @@ static void smc_lgr_terminate_work(struct work_struct *work)
struct smc_link_group *lgr = container_of(work, struct smc_link_group,
terminate_work);
smc_lgr_terminate(lgr);
smc_lgr_terminate(lgr, true);
}
/* create a new SMC link group */
@ -528,7 +528,7 @@ static void smc_sk_wake_ups(struct smc_sock *smc)
}
/* kill a connection */
static void smc_conn_kill(struct smc_connection *conn)
static void smc_conn_kill(struct smc_connection *conn, bool soft)
{
struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
@ -541,7 +541,10 @@ static void smc_conn_kill(struct smc_connection *conn)
smc_sk_wake_ups(smc);
if (conn->lgr->is_smcd) {
smc_ism_unset_conn(conn);
tasklet_kill(&conn->rx_tsklet);
if (soft)
tasklet_kill(&conn->rx_tsklet);
else
tasklet_unlock_wait(&conn->rx_tsklet);
}
smc_lgr_unregister_conn(conn);
smc_close_active_abort(smc);
@ -562,7 +565,7 @@ static void smc_lgr_cleanup(struct smc_link_group *lgr)
}
/* terminate link group */
static void __smc_lgr_terminate(struct smc_link_group *lgr)
static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
{
struct smc_connection *conn;
struct smc_sock *smc;
@ -570,6 +573,8 @@ static void __smc_lgr_terminate(struct smc_link_group *lgr)
if (lgr->terminating)
return; /* lgr already terminating */
if (!soft)
cancel_delayed_work_sync(&lgr->free_work);
lgr->terminating = 1;
if (!lgr->is_smcd)
smc_llc_link_inactive(&lgr->lnk[SMC_SINGLE_LINK]);
@ -583,7 +588,7 @@ static void __smc_lgr_terminate(struct smc_link_group *lgr)
smc = container_of(conn, struct smc_sock, conn);
sock_hold(&smc->sk); /* sock_put below */
lock_sock(&smc->sk);
smc_conn_kill(conn);
smc_conn_kill(conn, soft);
release_sock(&smc->sk);
sock_put(&smc->sk); /* sock_hold above */
read_lock_bh(&lgr->conns_lock);
@ -591,11 +596,17 @@ static void __smc_lgr_terminate(struct smc_link_group *lgr)
}
read_unlock_bh(&lgr->conns_lock);
smc_lgr_cleanup(lgr);
smc_lgr_schedule_free_work_fast(lgr);
if (soft)
smc_lgr_schedule_free_work_fast(lgr);
else
smc_lgr_free(lgr);
}
/* unlink and terminate link group */
void smc_lgr_terminate(struct smc_link_group *lgr)
/* unlink and terminate link group
* @soft: true if link group shutdown can take its time
* false if immediate link group shutdown is required
*/
void smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
{
spinlock_t *lgr_lock;
@ -605,9 +616,11 @@ void smc_lgr_terminate(struct smc_link_group *lgr)
spin_unlock_bh(lgr_lock);
return; /* lgr already terminating */
}
if (!soft)
lgr->freeing = 1;
list_del_init(&lgr->list);
spin_unlock_bh(lgr_lock);
__smc_lgr_terminate(lgr);
__smc_lgr_terminate(lgr, soft);
}
/* Called when IB port is terminated */
@ -627,11 +640,11 @@ void smc_port_terminate(struct smc_ib_device *smcibdev, u8 ibport)
list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
list_del_init(&lgr->list);
__smc_lgr_terminate(lgr);
__smc_lgr_terminate(lgr, true);
}
}
/* Called when SMC-D device is terminated or peer is lost */
/* Called when peer lgr shutdown (regularly or abnormally) is received */
void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
{
struct smc_link_group *lgr, *l;
@ -656,6 +669,24 @@ void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
}
}
/* Called when an SMCD device is removed or the smc module is unloaded */
void smc_smcd_terminate_all(struct smcd_dev *smcd)
{
struct smc_link_group *lgr, *lg;
LIST_HEAD(lgr_free_list);
spin_lock_bh(&smcd->lgr_lock);
list_splice_init(&smcd->lgr_list, &lgr_free_list);
list_for_each_entry(lgr, &lgr_free_list, list)
lgr->freeing = 1;
spin_unlock_bh(&smcd->lgr_lock);
list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
list_del_init(&lgr->list);
__smc_lgr_terminate(lgr, false);
}
}
/* Determine vlan of internal TCP socket.
* @vlan_id: address to store the determined vlan id into
*/
@ -1173,8 +1204,8 @@ static void smc_core_going_away(void)
spin_unlock(&smcd_dev_list.lock);
}
/* Called (from smc_exit) when module is removed */
void smc_core_exit(void)
/* Clean up all SMC link groups */
static void smc_lgrs_shutdown(void)
{
struct smc_link_group *lgr, *lg;
LIST_HEAD(lgr_freeing_list);
@ -1188,7 +1219,7 @@ void smc_core_exit(void)
spin_lock(&smcd_dev_list.lock);
list_for_each_entry(smcd, &smcd_dev_list.list, list)
list_splice_init(&smcd->lgr_list, &lgr_freeing_list);
smc_smcd_terminate_all(smcd);
spin_unlock(&smcd_dev_list.lock);
list_for_each_entry_safe(lgr, lg, &lgr_freeing_list, list) {
@ -1202,8 +1233,12 @@ void smc_core_exit(void)
smc_llc_link_inactive(lnk);
}
cancel_delayed_work_sync(&lgr->free_work);
if (lgr->is_smcd)
smc_ism_signal_shutdown(lgr);
smc_lgr_free(lgr); /* free link group */
}
}
/* Called (from smc_exit) when module is removed */
void smc_core_exit(void)
{
smc_lgrs_shutdown();
}

3
net/smc/smc_core.h
View File

@ -296,10 +296,11 @@ struct smc_clc_msg_accept_confirm;
struct smc_clc_msg_local;
void smc_lgr_forget(struct smc_link_group *lgr);
void smc_lgr_terminate(struct smc_link_group *lgr);
void smc_lgr_terminate(struct smc_link_group *lgr, bool soft);
void smc_port_terminate(struct smc_ib_device *smcibdev, u8 ibport);
void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid,
unsigned short vlan);
void smc_smcd_terminate_all(struct smcd_dev *dev);
int smc_buf_create(struct smc_sock *smc, bool is_smcd);
int smc_uncompress_bufsize(u8 compressed);
int smc_rmb_rtoken_handling(struct smc_connection *conn,

2
net/smc/smc_ism.c
View File

@ -329,7 +329,7 @@ void smcd_unregister_dev(struct smcd_dev *smcd)
list_del_init(&smcd->list);
spin_unlock(&smcd_dev_list.lock);
smcd->going_away = 1;
smc_smcd_terminate(smcd, 0, VLAN_VID_MASK);
smc_smcd_terminate_all(smcd);
flush_workqueue(smcd->event_wq);
destroy_workqueue(smcd->event_wq);

2
net/smc/smc_llc.c
View File

@ -614,7 +614,7 @@ static void smc_llc_testlink_work(struct work_struct *work)
rc = wait_for_completion_interruptible_timeout(&link->llc_testlink_resp,
SMC_LLC_WAIT_TIME);
if (rc <= 0) {
smc_lgr_terminate(smc_get_lgr(link));
smc_lgr_terminate(smc_get_lgr(link), true);
return;
}
next_interval = link->llc_testlink_time;

2
net/smc/smc_tx.c
View File

@ -284,7 +284,7 @@ static int smc_tx_rdma_write(struct smc_connection *conn, int peer_rmbe_offset,
rdma_wr->rkey = lgr->rtokens[conn->rtoken_idx][SMC_SINGLE_LINK].rkey;
rc = ib_post_send(link->roce_qp, &rdma_wr->wr, NULL);
if (rc)
smc_lgr_terminate(lgr);
smc_lgr_terminate(lgr, true);
return rc;
}