lib/iscsi: Remove unnecessary declarations about task queueing functions
We can remove unnecessary function declarations and make the structure of the source code top-down. Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com> Change-Id: I8d00c6cec0c0d05a6cd3b70e92062ce9c315ff3b Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/470261 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Ben Walker <benjamin.walker@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Shuhei Matsumoto
Changpeng Liu
parent
d8fa5bc145
commit
fd6efc7f4a
@ -76,9 +76,6 @@ struct spdk_iscsi_globals g_spdk_iscsi = {
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.poll_group_head = TAILQ_HEAD_INITIALIZER(g_spdk_iscsi.poll_group_head),
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};
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static int add_transfer_task(struct spdk_iscsi_conn *conn,
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struct spdk_iscsi_task *task);
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static int iscsi_send_r2t(struct spdk_iscsi_conn *conn,
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struct spdk_iscsi_task *task, int offset,
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int len, uint32_t transfer_tag, uint32_t *R2TSN);
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@ -2557,6 +2554,182 @@ iscsi_op_logout(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu *pdu)
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return 0;
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}
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static int
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add_transfer_task(struct spdk_iscsi_conn *conn, struct spdk_iscsi_task *task)
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{
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uint32_t transfer_len;
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size_t max_burst_len;
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size_t segment_len;
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size_t data_len;
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int len;
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int idx;
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int rc;
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int data_out_req;
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transfer_len = task->scsi.transfer_len;
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data_len = spdk_iscsi_task_get_pdu(task)->data_segment_len;
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max_burst_len = conn->sess->MaxBurstLength;
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segment_len = SPDK_ISCSI_MAX_RECV_DATA_SEGMENT_LENGTH;
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data_out_req = 1 + (transfer_len - data_len - 1) / segment_len;
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task->data_out_cnt = data_out_req;
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/*
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* If we already have too many tasks using R2T, then queue this task
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* and start sending R2T for it after some of the tasks using R2T/data
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* out buffers complete.
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*/
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if (conn->pending_r2t >= DEFAULT_MAXR2T) {
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TAILQ_INSERT_TAIL(&conn->queued_r2t_tasks, task, link);
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return 0;
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}
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conn->data_out_cnt += data_out_req;
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idx = conn->pending_r2t++;
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conn->outstanding_r2t_tasks[idx] = task;
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task->next_expected_r2t_offset = data_len;
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task->current_r2t_length = 0;
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task->R2TSN = 0;
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/* According to RFC3720 10.8.5, 0xffffffff is
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* reserved for TTT in R2T.
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*/
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if (++conn->ttt == 0xffffffffu) {
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conn->ttt = 0;
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}
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task->ttt = conn->ttt;
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while (data_len != transfer_len) {
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len = DMIN32(max_burst_len, (transfer_len - data_len));
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rc = iscsi_send_r2t(conn, task, data_len, len,
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task->ttt, &task->R2TSN);
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if (rc < 0) {
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SPDK_ERRLOG("iscsi_send_r2t() failed\n");
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return rc;
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}
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data_len += len;
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task->next_r2t_offset = data_len;
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task->outstanding_r2t++;
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if (conn->sess->MaxOutstandingR2T == task->outstanding_r2t) {
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break;
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}
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}
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TAILQ_INSERT_TAIL(&conn->active_r2t_tasks, task, link);
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return 0;
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}
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/* If there are additional large writes queued for R2Ts, start them now.
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* This is called when a large write is just completed or when multiple LUNs
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* are attached and large write tasks for the specific LUN are cleared.
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*/
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static void
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start_queued_transfer_tasks(struct spdk_iscsi_conn *conn)
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{
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struct spdk_iscsi_task *task, *tmp;
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TAILQ_FOREACH_SAFE(task, &conn->queued_r2t_tasks, link, tmp) {
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if (conn->pending_r2t < DEFAULT_MAXR2T) {
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TAILQ_REMOVE(&conn->queued_r2t_tasks, task, link);
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add_transfer_task(conn, task);
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} else {
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break;
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}
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}
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}
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void spdk_del_transfer_task(struct spdk_iscsi_conn *conn, uint32_t task_tag)
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{
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struct spdk_iscsi_task *task;
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int i;
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for (i = 0; i < conn->pending_r2t; i++) {
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if (conn->outstanding_r2t_tasks[i]->tag == task_tag) {
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task = conn->outstanding_r2t_tasks[i];
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conn->data_out_cnt -= task->data_out_cnt;
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conn->pending_r2t--;
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for (; i < conn->pending_r2t; i++) {
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conn->outstanding_r2t_tasks[i] = conn->outstanding_r2t_tasks[i + 1];
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}
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conn->outstanding_r2t_tasks[conn->pending_r2t] = NULL;
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break;
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}
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}
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start_queued_transfer_tasks(conn);
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}
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static void
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del_connection_queued_task(struct spdk_iscsi_conn *conn, void *tailq,
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struct spdk_scsi_lun *lun,
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struct spdk_iscsi_pdu *pdu)
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{
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struct spdk_iscsi_task *task, *task_tmp;
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struct spdk_iscsi_pdu *pdu_tmp;
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/*
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* Temporary used to index spdk_scsi_task related
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* queues of the connection.
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*/
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TAILQ_HEAD(queued_tasks, spdk_iscsi_task) *head;
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head = (struct queued_tasks *)tailq;
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TAILQ_FOREACH_SAFE(task, head, link, task_tmp) {
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pdu_tmp = spdk_iscsi_task_get_pdu(task);
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if ((lun == NULL || lun == task->scsi.lun) &&
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(pdu == NULL || SN32_LT(pdu_tmp->cmd_sn, pdu->cmd_sn))) {
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TAILQ_REMOVE(head, task, link);
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if (lun != NULL && spdk_scsi_lun_is_removing(lun)) {
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spdk_scsi_task_process_null_lun(&task->scsi);
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spdk_iscsi_task_response(conn, task);
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}
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spdk_iscsi_task_put(task);
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}
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}
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}
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void spdk_clear_all_transfer_task(struct spdk_iscsi_conn *conn,
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struct spdk_scsi_lun *lun,
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struct spdk_iscsi_pdu *pdu)
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{
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int i, j, pending_r2t;
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struct spdk_iscsi_task *task;
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struct spdk_iscsi_pdu *pdu_tmp;
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pending_r2t = conn->pending_r2t;
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for (i = 0; i < pending_r2t; i++) {
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task = conn->outstanding_r2t_tasks[i];
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pdu_tmp = spdk_iscsi_task_get_pdu(task);
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if ((lun == NULL || lun == task->scsi.lun) &&
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(pdu == NULL || SN32_LT(pdu_tmp->cmd_sn, pdu->cmd_sn))) {
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conn->outstanding_r2t_tasks[i] = NULL;
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task->outstanding_r2t = 0;
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task->next_r2t_offset = 0;
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task->next_expected_r2t_offset = 0;
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conn->data_out_cnt -= task->data_out_cnt;
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conn->pending_r2t--;
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}
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}
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for (i = 0; i < pending_r2t; i++) {
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if (conn->outstanding_r2t_tasks[i] != NULL) {
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continue;
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}
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for (j = i + 1; j < pending_r2t; j++) {
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if (conn->outstanding_r2t_tasks[j] != NULL) {
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conn->outstanding_r2t_tasks[i] = conn->outstanding_r2t_tasks[j];
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conn->outstanding_r2t_tasks[j] = NULL;
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break;
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}
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}
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}
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del_connection_queued_task(conn, &conn->active_r2t_tasks, lun, pdu);
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del_connection_queued_task(conn, &conn->queued_r2t_tasks, lun, pdu);
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start_queued_transfer_tasks(conn);
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}
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/* This function returns the spdk_scsi_task by searching the snack list via
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* task transfertag and the pdu's opcode
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*/
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@ -3637,182 +3810,6 @@ iscsi_op_nopout(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu *pdu)
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return 0;
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}
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static int
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add_transfer_task(struct spdk_iscsi_conn *conn, struct spdk_iscsi_task *task)
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{
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uint32_t transfer_len;
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size_t max_burst_len;
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size_t segment_len;
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size_t data_len;
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int len;
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int idx;
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int rc;
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int data_out_req;
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transfer_len = task->scsi.transfer_len;
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data_len = spdk_iscsi_task_get_pdu(task)->data_segment_len;
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max_burst_len = conn->sess->MaxBurstLength;
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segment_len = SPDK_ISCSI_MAX_RECV_DATA_SEGMENT_LENGTH;
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data_out_req = 1 + (transfer_len - data_len - 1) / segment_len;
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task->data_out_cnt = data_out_req;
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/*
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* If we already have too many tasks using R2T, then queue this task
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* and start sending R2T for it after some of the tasks using R2T/data
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* out buffers complete.
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*/
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if (conn->pending_r2t >= DEFAULT_MAXR2T) {
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TAILQ_INSERT_TAIL(&conn->queued_r2t_tasks, task, link);
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return 0;
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}
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conn->data_out_cnt += data_out_req;
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idx = conn->pending_r2t++;
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conn->outstanding_r2t_tasks[idx] = task;
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task->next_expected_r2t_offset = data_len;
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task->current_r2t_length = 0;
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task->R2TSN = 0;
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/* According to RFC3720 10.8.5, 0xffffffff is
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* reserved for TTT in R2T.
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*/
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if (++conn->ttt == 0xffffffffu) {
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conn->ttt = 0;
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}
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task->ttt = conn->ttt;
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while (data_len != transfer_len) {
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len = DMIN32(max_burst_len, (transfer_len - data_len));
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rc = iscsi_send_r2t(conn, task, data_len, len,
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task->ttt, &task->R2TSN);
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if (rc < 0) {
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SPDK_ERRLOG("iscsi_send_r2t() failed\n");
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return rc;
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}
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data_len += len;
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task->next_r2t_offset = data_len;
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task->outstanding_r2t++;
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if (conn->sess->MaxOutstandingR2T == task->outstanding_r2t) {
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break;
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}
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}
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TAILQ_INSERT_TAIL(&conn->active_r2t_tasks, task, link);
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return 0;
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}
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/* If there are additional large writes queued for R2Ts, start them now.
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* This is called when a large write is just completed or when multiple LUNs
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* are attached and large write tasks for the specific LUN are cleared.
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*/
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static void
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start_queued_transfer_tasks(struct spdk_iscsi_conn *conn)
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{
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struct spdk_iscsi_task *task, *tmp;
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TAILQ_FOREACH_SAFE(task, &conn->queued_r2t_tasks, link, tmp) {
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if (conn->pending_r2t < DEFAULT_MAXR2T) {
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TAILQ_REMOVE(&conn->queued_r2t_tasks, task, link);
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add_transfer_task(conn, task);
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} else {
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break;
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}
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}
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}
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void spdk_del_transfer_task(struct spdk_iscsi_conn *conn, uint32_t task_tag)
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{
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struct spdk_iscsi_task *task;
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int i;
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for (i = 0; i < conn->pending_r2t; i++) {
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if (conn->outstanding_r2t_tasks[i]->tag == task_tag) {
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task = conn->outstanding_r2t_tasks[i];
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conn->data_out_cnt -= task->data_out_cnt;
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conn->pending_r2t--;
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for (; i < conn->pending_r2t; i++) {
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conn->outstanding_r2t_tasks[i] = conn->outstanding_r2t_tasks[i + 1];
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}
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conn->outstanding_r2t_tasks[conn->pending_r2t] = NULL;
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break;
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}
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}
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start_queued_transfer_tasks(conn);
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}
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static void
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del_connection_queued_task(struct spdk_iscsi_conn *conn, void *tailq,
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struct spdk_scsi_lun *lun,
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struct spdk_iscsi_pdu *pdu)
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{
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struct spdk_iscsi_task *task, *task_tmp;
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struct spdk_iscsi_pdu *pdu_tmp;
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/*
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* Temporary used to index spdk_scsi_task related
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* queues of the connection.
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*/
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TAILQ_HEAD(queued_tasks, spdk_iscsi_task) *head;
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head = (struct queued_tasks *)tailq;
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TAILQ_FOREACH_SAFE(task, head, link, task_tmp) {
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pdu_tmp = spdk_iscsi_task_get_pdu(task);
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if ((lun == NULL || lun == task->scsi.lun) &&
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(pdu == NULL || SN32_LT(pdu_tmp->cmd_sn, pdu->cmd_sn))) {
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TAILQ_REMOVE(head, task, link);
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if (lun != NULL && spdk_scsi_lun_is_removing(lun)) {
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spdk_scsi_task_process_null_lun(&task->scsi);
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spdk_iscsi_task_response(conn, task);
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}
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spdk_iscsi_task_put(task);
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}
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}
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}
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void spdk_clear_all_transfer_task(struct spdk_iscsi_conn *conn,
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struct spdk_scsi_lun *lun,
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struct spdk_iscsi_pdu *pdu)
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{
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int i, j, pending_r2t;
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struct spdk_iscsi_task *task;
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struct spdk_iscsi_pdu *pdu_tmp;
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pending_r2t = conn->pending_r2t;
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for (i = 0; i < pending_r2t; i++) {
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task = conn->outstanding_r2t_tasks[i];
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pdu_tmp = spdk_iscsi_task_get_pdu(task);
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if ((lun == NULL || lun == task->scsi.lun) &&
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(pdu == NULL || SN32_LT(pdu_tmp->cmd_sn, pdu->cmd_sn))) {
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conn->outstanding_r2t_tasks[i] = NULL;
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task->outstanding_r2t = 0;
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task->next_r2t_offset = 0;
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task->next_expected_r2t_offset = 0;
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conn->data_out_cnt -= task->data_out_cnt;
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conn->pending_r2t--;
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}
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}
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for (i = 0; i < pending_r2t; i++) {
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if (conn->outstanding_r2t_tasks[i] != NULL) {
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continue;
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}
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for (j = i + 1; j < pending_r2t; j++) {
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if (conn->outstanding_r2t_tasks[j] != NULL) {
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conn->outstanding_r2t_tasks[i] = conn->outstanding_r2t_tasks[j];
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conn->outstanding_r2t_tasks[j] = NULL;
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break;
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}
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}
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}
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del_connection_queued_task(conn, &conn->active_r2t_tasks, lun, pdu);
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del_connection_queued_task(conn, &conn->queued_r2t_tasks, lun, pdu);
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start_queued_transfer_tasks(conn);
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}
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/* This function is used to handle the r2t snack */
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static int
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iscsi_handle_r2t_snack(struct spdk_iscsi_conn *conn,
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