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lib/iscsi: Unify outstanding_r2t_tasks array and active_r2t_tasks list into the latter

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We have no particular requirement to keep both conn->outstanding_r2t_tasks
array and conn->active_r2t_tasks list now.

To improve readability and maintaineability, unify two into the latter,
conn->outstanding_r2t_tasks list. Update unit test accordingly.

Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Change-Id: I25cf7cffbe39ac66e102eb3052340de6ef65c8f1
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/3115
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Shuhei Matsumoto 2020-06-29 18:11:48 +09:00 committed by Tomasz Zawadzki
parent d5f3f48b60
commit ee7f961655
4 changed files with 29 additions and 70 deletions
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4
lib/iscsi/conn.c
View File

@ -259,10 +259,6 @@ iscsi_conn_construct(struct spdk_iscsi_portal *portal,
conn->sess_param_state_negotiated[i] = false;
}
for (i = 0; i < DEFAULT_MAXR2T; i++) {
conn->outstanding_r2t_tasks[i] = NULL;
}
conn->pdu_recv_state = ISCSI_PDU_RECV_STATE_AWAIT_PDU_READY;
TAILQ_INIT(&conn->write_pdu_list);

1
lib/iscsi/conn.h
View File

@ -138,7 +138,6 @@ struct spdk_iscsi_conn {
TAILQ_HEAD(, spdk_iscsi_pdu) snack_pdu_list;
int pending_r2t;
struct spdk_iscsi_task *outstanding_r2t_tasks[DEFAULT_MAXR2T];
uint16_t cid;

90
lib/iscsi/iscsi.c
View File

@ -2734,7 +2734,6 @@ add_transfer_task(struct spdk_iscsi_conn *conn, struct spdk_iscsi_task *task)
size_t segment_len;
size_t data_len;
int len;
int idx;
int rc;
int data_out_req;
@ -2756,9 +2755,8 @@ add_transfer_task(struct spdk_iscsi_conn *conn, struct spdk_iscsi_task *task)
}
conn->data_out_cnt += data_out_req;
idx = conn->pending_r2t++;
conn->pending_r2t++;
conn->outstanding_r2t_tasks[idx] = task;
task->next_expected_r2t_offset = data_len;
task->current_r2t_length = 0;
task->R2TSN = 0;
@ -2813,20 +2811,14 @@ start_queued_transfer_tasks(struct spdk_iscsi_conn *conn)
bool
iscsi_del_transfer_task(struct spdk_iscsi_conn *conn, uint32_t task_tag)
{
struct spdk_iscsi_task *task;
int i;
struct spdk_iscsi_task *task, *tmp;
for (i = 0; i < conn->pending_r2t; i++) {
if (conn->outstanding_r2t_tasks[i]->tag == task_tag) {
task = conn->outstanding_r2t_tasks[i];
TAILQ_FOREACH_SAFE(task, &conn->active_r2t_tasks, link, tmp) {
if (task->tag == task_tag) {
assert(conn->data_out_cnt >= task->data_out_cnt);
conn->data_out_cnt -= task->data_out_cnt;
conn->pending_r2t--;
for (; i < conn->pending_r2t; i++) {
conn->outstanding_r2t_tasks[i] = conn->outstanding_r2t_tasks[i + 1];
}
conn->outstanding_r2t_tasks[conn->pending_r2t] = NULL;
assert(task->is_r2t_active == true);
TAILQ_REMOVE(&conn->active_r2t_tasks, task, link);
@ -2840,26 +2832,25 @@ iscsi_del_transfer_task(struct spdk_iscsi_conn *conn, uint32_t task_tag)
return false;
}
static void
del_connection_queued_task(struct spdk_iscsi_conn *conn, void *tailq,
struct spdk_scsi_lun *lun,
struct spdk_iscsi_pdu *pdu)
void iscsi_clear_all_transfer_task(struct spdk_iscsi_conn *conn,
struct spdk_scsi_lun *lun,
struct spdk_iscsi_pdu *pdu)
{
struct spdk_iscsi_task *task, *task_tmp;
struct spdk_iscsi_pdu *pdu_tmp;
/*
* Temporary used to index spdk_scsi_task related
* queues of the connection.
*/
TAILQ_HEAD(queued_tasks, spdk_iscsi_task) *head;
head = (struct queued_tasks *)tailq;
TAILQ_FOREACH_SAFE(task, head, link, task_tmp) {
TAILQ_FOREACH_SAFE(task, &conn->active_r2t_tasks, link, task_tmp) {
pdu_tmp = iscsi_task_get_pdu(task);
if ((lun == NULL || lun == task->scsi.lun) &&
(pdu == NULL || spdk_sn32_lt(pdu_tmp->cmd_sn, pdu->cmd_sn))) {
TAILQ_REMOVE(head, task, link);
task->outstanding_r2t = 0;
task->next_r2t_offset = 0;
task->next_expected_r2t_offset = 0;
assert(conn->data_out_cnt >= task->data_out_cnt);
conn->data_out_cnt -= task->data_out_cnt;
conn->pending_r2t--;
TAILQ_REMOVE(&conn->active_r2t_tasks, task, link);
task->is_r2t_active = false;
if (lun != NULL && spdk_scsi_lun_is_removing(lun)) {
spdk_scsi_task_process_null_lun(&task->scsi);
@ -2868,59 +2859,32 @@ del_connection_queued_task(struct spdk_iscsi_conn *conn, void *tailq,
iscsi_task_put(task);
}
}
}
void iscsi_clear_all_transfer_task(struct spdk_iscsi_conn *conn,
struct spdk_scsi_lun *lun,
struct spdk_iscsi_pdu *pdu)
{
int i, j, pending_r2t;
struct spdk_iscsi_task *task;
struct spdk_iscsi_pdu *pdu_tmp;
pending_r2t = conn->pending_r2t;
for (i = 0; i < pending_r2t; i++) {
task = conn->outstanding_r2t_tasks[i];
TAILQ_FOREACH_SAFE(task, &conn->queued_r2t_tasks, link, task_tmp) {
pdu_tmp = iscsi_task_get_pdu(task);
if ((lun == NULL || lun == task->scsi.lun) &&
(pdu == NULL || spdk_sn32_lt(pdu_tmp->cmd_sn, pdu->cmd_sn))) {
conn->outstanding_r2t_tasks[i] = NULL;
task->outstanding_r2t = 0;
task->next_r2t_offset = 0;
task->next_expected_r2t_offset = 0;
assert(conn->data_out_cnt >= task->data_out_cnt);
conn->data_out_cnt -= task->data_out_cnt;
conn->pending_r2t--;
}
}
for (i = 0; i < pending_r2t; i++) {
if (conn->outstanding_r2t_tasks[i] != NULL) {
continue;
}
for (j = i + 1; j < pending_r2t; j++) {
if (conn->outstanding_r2t_tasks[j] != NULL) {
conn->outstanding_r2t_tasks[i] = conn->outstanding_r2t_tasks[j];
conn->outstanding_r2t_tasks[j] = NULL;
break;
TAILQ_REMOVE(&conn->queued_r2t_tasks, task, link);
task->is_r2t_active = false;
if (lun != NULL && spdk_scsi_lun_is_removing(lun)) {
spdk_scsi_task_process_null_lun(&task->scsi);
iscsi_task_response(conn, task);
}
iscsi_task_put(task);
}
}
del_connection_queued_task(conn, &conn->active_r2t_tasks, lun, pdu);
del_connection_queued_task(conn, &conn->queued_r2t_tasks, lun, pdu);
start_queued_transfer_tasks(conn);
}
static struct spdk_iscsi_task *
get_transfer_task(struct spdk_iscsi_conn *conn, uint32_t transfer_tag)
{
int i;
struct spdk_iscsi_task *task;
for (i = 0; i < conn->pending_r2t; i++) {
if (conn->outstanding_r2t_tasks[i]->ttt == transfer_tag) {
return (conn->outstanding_r2t_tasks[i]);
TAILQ_FOREACH(task, &conn->active_r2t_tasks, link) {
if (task->ttt == transfer_tag) {
return task;
}
}

4
test/unit/lib/iscsi/iscsi.c/iscsi_ut.c
View File

@ -687,7 +687,6 @@ add_transfer_task_test(void)
CU_ASSERT(conn.data_out_cnt == 255);
CU_ASSERT(conn.pending_r2t == 1);
CU_ASSERT(conn.outstanding_r2t_tasks[0] == &task);
CU_ASSERT(conn.ttt == 1);
CU_ASSERT(task.data_out_cnt == 255);
@ -1871,6 +1870,7 @@ pdu_hdr_op_data_test(void)
conn.sess = &sess;
conn.dev = &dev;
TAILQ_INIT(&conn.active_r2t_tasks);
/* Case 1 - SCSI Data-Out PDU is acceptable only on normal session. */
sess.session_type = SESSION_TYPE_DISCOVERY;
@ -1898,7 +1898,7 @@ pdu_hdr_op_data_test(void)
*/
primary.desired_data_transfer_length = SPDK_ISCSI_MAX_RECV_DATA_SEGMENT_LENGTH - 1;
conn.pending_r2t = 1;
conn.outstanding_r2t_tasks[0] = &primary;
TAILQ_INSERT_TAIL(&conn.active_r2t_tasks, &primary, link);
rc = iscsi_pdu_hdr_op_data(&conn, &pdu);
CU_ASSERT(rc == SPDK_ISCSI_CONNECTION_FATAL);