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iscsi: use temporary poller when PDUs cannot all be flushed

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This removes PDU flushing from the main connection poller -
all PDU flushing is now done inline when the PDU is completed,
or from the context of the new flush poller.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I703cb451d4b548e7f75892e31a7927b511fb4f55

Reviewed-on: https://review.gerrithub.io/395543
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-by: <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Ziye Yang <optimistyzy@gmail.com>
This commit is contained in:
Jim Harris 2018-01-19 10:22:41 -07:00 committed by Daniel Verkamp
parent a1bbed818e
commit 89859d3118
2 changed files with 17 additions and 17 deletions
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33
lib/iscsi/conn.c
View File

@ -693,6 +693,7 @@ void spdk_iscsi_conn_destruct(struct spdk_iscsi_conn *conn)
spdk_clear_all_transfer_task(conn, NULL);
spdk_sock_close(conn->sock);
spdk_poller_unregister(&conn->logout_timer);
spdk_poller_unregister(&conn->flush_poller);
rc = spdk_iscsi_conn_free_tasks(conn);
if (rc < 0) {
@ -1218,13 +1219,19 @@ spdk_iscsi_conn_flush_pdus_internal(struct spdk_iscsi_conn *conn)
* Returns -1 for an exceptional error indicating the TCP connection
* should be closed.
*/
static int
spdk_iscsi_conn_flush_pdus(struct spdk_iscsi_conn *conn)
static void
spdk_iscsi_conn_flush_pdus(void *_conn)
{
struct spdk_iscsi_conn *conn = _conn;
int rc;
if (conn->state == ISCSI_CONN_STATE_RUNNING) {
rc = spdk_iscsi_conn_flush_pdus_internal(conn);
if (rc == 0 && conn->flush_poller != NULL) {
spdk_poller_unregister(&conn->flush_poller);
} else if (rc == 1 && conn->flush_poller == NULL) {
conn->flush_poller = spdk_poller_register(spdk_iscsi_conn_flush_pdus, conn, 50);
}
} else {
/*
* If the connection state is not RUNNING, then
@ -1237,16 +1244,6 @@ spdk_iscsi_conn_flush_pdus(struct spdk_iscsi_conn *conn)
} while (rc == 1);
}
return rc;
}
void
spdk_iscsi_conn_write_pdu(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu *pdu)
{
int rc;
TAILQ_INSERT_TAIL(&conn->write_pdu_list, pdu, tailq);
rc = spdk_iscsi_conn_flush_pdus(conn);
if (rc < 0 && conn->state < ISCSI_CONN_STATE_EXITING) {
/*
* If the poller has already started destruction of the connection,
@ -1257,6 +1254,13 @@ spdk_iscsi_conn_write_pdu(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu *p
}
}
void
spdk_iscsi_conn_write_pdu(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu *pdu)
{
TAILQ_INSERT_TAIL(&conn->write_pdu_list, pdu, tailq);
spdk_iscsi_conn_flush_pdus(conn);
}
#define GET_PDU_LOOP_COUNT 16
static int
@ -1323,11 +1327,6 @@ spdk_iscsi_conn_execute(struct spdk_iscsi_conn *conn)
conn_active = true;
}
if (spdk_iscsi_conn_flush_pdus(conn) < 0) {
conn->state = ISCSI_CONN_STATE_EXITING;
goto conn_exit;
}
spdk_iscsi_conn_handle_queued_datain_tasks(conn);
if (conn_active) {

1
lib/iscsi/conn.h
View File

@ -160,6 +160,7 @@ struct spdk_iscsi_conn {
STAILQ_ENTRY(spdk_iscsi_conn) link;
struct spdk_poller *poller;
struct spdk_poller *flush_poller;
TAILQ_HEAD(queued_r2t_tasks, spdk_iscsi_task) queued_r2t_tasks;
TAILQ_HEAD(active_r2t_tasks, spdk_iscsi_task) active_r2t_tasks;
TAILQ_HEAD(queued_datain_tasks, spdk_iscsi_task) queued_datain_tasks;