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scsi: iscsi: Add recv workqueue helpers 

Add helpers to allow the drivers to run their recv paths from libiscsi's
workqueue.

Link: https://lore.kernel.org/r/20220616224557.115234-3-michael.christie@oracle.com
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2022-06-16 17:45:50 -05:00 committed by Martin K. Petersen
parent 4b9f8ce4d5
commit 8af809966c
2 changed files with 31 additions and 2 deletions
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29
drivers/scsi/libiscsi.c
View File

@ -93,6 +93,16 @@ inline void iscsi_conn_queue_xmit(struct iscsi_conn *conn)
}
EXPORT_SYMBOL_GPL(iscsi_conn_queue_xmit);
inline void iscsi_conn_queue_recv(struct iscsi_conn *conn)
{
struct Scsi_Host *shost = conn->session->host;
struct iscsi_host *ihost = shost_priv(shost);
if (ihost->workq && !test_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags))
queue_work(ihost->workq, &conn->recvwork);
}
EXPORT_SYMBOL_GPL(iscsi_conn_queue_recv);
static void __iscsi_update_cmdsn(struct iscsi_session *session,
uint32_t exp_cmdsn, uint32_t max_cmdsn)
{
@ -1947,7 +1957,7 @@ EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
/**
* iscsi_suspend_tx - suspend iscsi_data_xmit
* @conn: iscsi conn tp stop processing IO on.
* @conn: iscsi conn to stop processing IO on.
*
* This function sets the suspend bit to prevent iscsi_data_xmit
* from sending new IO, and if work is queued on the xmit thread
@ -1960,7 +1970,7 @@ void iscsi_suspend_tx(struct iscsi_conn *conn)
set_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags);
if (ihost->workq)
flush_workqueue(ihost->workq);
flush_work(&conn->xmitwork);
}
EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
@ -1970,6 +1980,21 @@ static void iscsi_start_tx(struct iscsi_conn *conn)
iscsi_conn_queue_xmit(conn);
}
/**
* iscsi_suspend_rx - Prevent recvwork from running again.
* @conn: iscsi conn to stop.
*/
void iscsi_suspend_rx(struct iscsi_conn *conn)
{
struct Scsi_Host *shost = conn->session->host;
struct iscsi_host *ihost = shost_priv(shost);
set_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags);
if (ihost->workq)
flush_work(&conn->recvwork);
}
EXPORT_SYMBOL_GPL(iscsi_suspend_rx);
/*
* We want to make sure a ping is in flight. It has timed out.
* And we are not busy processing a pdu that is making

4
include/scsi/libiscsi.h
View File

@ -213,6 +213,8 @@ struct iscsi_conn {
struct list_head cmdqueue; /* data-path cmd queue */
struct list_head requeue; /* tasks needing another run */
struct work_struct xmitwork; /* per-conn. xmit workqueue */
/* recv */
struct work_struct recvwork;
unsigned long flags; /* ISCSI_CONN_FLAGs */
/* negotiated params */
@ -452,8 +454,10 @@ extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
extern int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
enum iscsi_param param, char *buf);
extern void iscsi_suspend_tx(struct iscsi_conn *conn);
extern void iscsi_suspend_rx(struct iscsi_conn *conn);
extern void iscsi_suspend_queue(struct iscsi_conn *conn);
extern void iscsi_conn_queue_xmit(struct iscsi_conn *conn);
extern void iscsi_conn_queue_recv(struct iscsi_conn *conn);
#define iscsi_conn_printk(prefix, _c, fmt, a...) \
iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \