This gets iscsi_target_tx_thread down to where it fits on a page.
Signed-off-by: Andy Grover <agrover@xxxxxxxxxx>
---
drivers/target/iscsi/iscsi_target.c | 347 +++++++++++++++++++----------------
1 files changed, 191 insertions(+), 156 deletions(-)
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index c0e839a..31e6efe 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -3508,13 +3508,193 @@ static inline void iscsit_thread_check_cpumask(
set_cpus_allowed_ptr(p, conn->conn_cpumask);
}
-int iscsi_target_tx_thread(void *arg)
+static int handle_immediate_queue(struct iscsi_conn *conn)
{
+ struct iscsi_queue_req *qr;
+ struct iscsi_cmd *cmd;
u8 state;
+ int ret;
+
+ while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
+ atomic_set(&conn->check_immediate_queue, 0);
+ cmd = qr->cmd;
+ state = qr->state;
+ kmem_cache_free(lio_qr_cache, qr);
+
+ switch (state) {
+ case ISTATE_SEND_R2T:
+ ret = iscsit_send_r2t(cmd, conn);
+ if (ret < 0)
+ goto err;
+ break;
+ case ISTATE_REMOVE:
+ if (cmd->data_direction == DMA_TO_DEVICE)
+ iscsit_stop_dataout_timer(cmd);
+
+ spin_lock_bh(&conn->cmd_lock);
+ list_del(&cmd->i_conn_node);
+ spin_unlock_bh(&conn->cmd_lock);
+
+ iscsit_free_cmd(cmd);
+ continue;
+ case ISTATE_SEND_NOPIN_WANT_RESPONSE:
+ iscsit_mod_nopin_response_timer(conn);
+ ret = iscsit_send_unsolicited_nopin(cmd,
+ conn, 1);
+ if (ret < 0)
+ goto err;
+ break;
+ case ISTATE_SEND_NOPIN_NO_RESPONSE:
+ ret = iscsit_send_unsolicited_nopin(cmd,
+ conn, 0);
+ if (ret < 0)
+ goto err;
+ break;
+ default:
+ pr_err("Unknown Opcode: 0x%02x ITT:"
+ " 0x%08x, i_state: %d on CID: %hu\n",
+ cmd->iscsi_opcode, cmd->init_task_tag, state,
+ conn->cid);
+ goto err;
+ }
+ }
+
+ return 0;
+
+err:
+ return -1;
+}
+
+static int handle_response_queue(struct iscsi_conn *conn)
+{
+ struct iscsi_queue_req *qr;
+ struct iscsi_cmd *cmd;
+ u8 state;
+ int ret;
+
+ while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
+ cmd = qr->cmd;
+ state = qr->state;
+ kmem_cache_free(lio_qr_cache, qr);
+
+check_rsp_state:
+ switch (state) {
+ case ISTATE_SEND_DATAIN:
+ ret = iscsit_send_data_in(cmd, conn);
+ if (ret < 0)
+ goto err;
+ else if (!ret)
+ /* more drs */
+ goto check_rsp_state;
+ else if (ret == 1) {
+ /* all done */
+ spin_lock_bh(&cmd->istate_lock);
+ cmd->i_state = ISTATE_SENT_STATUS;
+ spin_unlock_bh(&cmd->istate_lock);
+ continue;
+ } else if (ret == 2) {
+ /* Still must send status,
+ SCF_TRANSPORT_TASK_SENSE was set */
+ spin_lock_bh(&cmd->istate_lock);
+ cmd->i_state = ISTATE_SEND_STATUS;
+ spin_unlock_bh(&cmd->istate_lock);
+ state = ISTATE_SEND_STATUS;
+ goto check_rsp_state;
+ }
+
+ break;
+ case ISTATE_SEND_STATUS:
+ case ISTATE_SEND_STATUS_RECOVERY:
+ ret = iscsit_send_status(cmd, conn);
+ break;
+ case ISTATE_SEND_LOGOUTRSP:
+ ret = iscsit_send_logout_response(cmd, conn);
+ break;
+ case ISTATE_SEND_ASYNCMSG:
+ ret = iscsit_send_conn_drop_async_message(
+ cmd, conn);
+ break;
+ case ISTATE_SEND_NOPIN:
+ ret = iscsit_send_nopin_response(cmd, conn);
+ break;
+ case ISTATE_SEND_REJECT:
+ ret = iscsit_send_reject(cmd, conn);
+ break;
+ case ISTATE_SEND_TASKMGTRSP:
+ ret = iscsit_send_task_mgt_rsp(cmd, conn);
+ if (ret != 0)
+ break;
+ ret = iscsit_tmr_post_handler(cmd, conn);
+ if (ret != 0)
+ iscsit_fall_back_to_erl0(conn->sess);
+ break;
+ case ISTATE_SEND_TEXTRSP:
+ ret = iscsit_send_text_rsp(cmd, conn);
+ break;
+ default:
+ pr_err("Unknown Opcode: 0x%02x ITT:"
+ " 0x%08x, i_state: %d on CID: %hu\n",
+ cmd->iscsi_opcode, cmd->init_task_tag,
+ state, conn->cid);
+ goto err;
+ }
+ if (ret < 0)
+ goto err;
+
+ if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
+ iscsit_tx_thread_wait_for_tcp(conn);
+ iscsit_unmap_iovec(cmd);
+ goto err;
+ }
+ iscsit_unmap_iovec(cmd);
+
+ switch (state) {
+ case ISTATE_SEND_LOGOUTRSP:
+ if (!iscsit_logout_post_handler(cmd, conn))
+ goto restart;
+ /* fall through */
+ case ISTATE_SEND_STATUS:
+ case ISTATE_SEND_ASYNCMSG:
+ case ISTATE_SEND_NOPIN:
+ case ISTATE_SEND_STATUS_RECOVERY:
+ case ISTATE_SEND_TEXTRSP:
+ case ISTATE_SEND_TASKMGTRSP:
+ spin_lock_bh(&cmd->istate_lock);
+ cmd->i_state = ISTATE_SENT_STATUS;
+ spin_unlock_bh(&cmd->istate_lock);
+ break;
+ case ISTATE_SEND_REJECT:
+ if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
+ cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
+ complete(&cmd->reject_comp);
+ goto err;
+ }
+ complete(&cmd->reject_comp);
+ break;
+ default:
+ pr_err("Unknown Opcode: 0x%02x ITT:"
+ " 0x%08x, i_state: %d on CID: %hu\n",
+ cmd->iscsi_opcode, cmd->init_task_tag,
+ cmd->i_state, conn->cid);
+ goto err;
+ }
+
+ if (atomic_read(&conn->check_immediate_queue))
+ break;
+ }
+
+ return 0;
+
+err:
+ return -1;
+restart:
+ return -EAGAIN;
+}
+
+int iscsi_target_tx_thread(void *arg)
+{
int ret = 0;
- struct iscsi_cmd *cmd = NULL;
struct iscsi_conn *conn;
- struct iscsi_queue_req *qr = NULL;
struct iscsi_thread_set *ts = arg;
/*
* Allow ourselves to be interrupted by SIGINT so that a
@@ -3542,160 +3722,15 @@ restart:
signal_pending(current))
goto transport_err;
- while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
- atomic_set(&conn->check_immediate_queue, 0);
- cmd = qr->cmd;
- state = qr->state;
- kmem_cache_free(lio_qr_cache, qr);
-
- switch (state) {
- case ISTATE_SEND_R2T:
- ret = iscsit_send_r2t(cmd, conn);
- if (ret < 0)
- goto transport_err;
- break;
- case ISTATE_REMOVE:
- if (cmd->data_direction == DMA_TO_DEVICE)
- iscsit_stop_dataout_timer(cmd);
-
- spin_lock_bh(&conn->cmd_lock);
- list_del(&cmd->i_conn_node);
- spin_unlock_bh(&conn->cmd_lock);
-
- iscsit_free_cmd(cmd);
- continue;
- case ISTATE_SEND_NOPIN_WANT_RESPONSE:
- iscsit_mod_nopin_response_timer(conn);
- ret = iscsit_send_unsolicited_nopin(cmd,
- conn, 1);
- if (ret < 0)
- goto transport_err;
- break;
- case ISTATE_SEND_NOPIN_NO_RESPONSE:
- ret = iscsit_send_unsolicited_nopin(cmd,
- conn, 0);
- if (ret < 0)
- goto transport_err;
- break;
- default:
- pr_err("Unknown Opcode: 0x%02x ITT:"
- " 0x%08x, i_state: %d on CID: %hu\n",
- cmd->iscsi_opcode, cmd->init_task_tag, state,
- conn->cid);
- goto transport_err;
- }
- }
-
- while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
- cmd = qr->cmd;
- state = qr->state;
- kmem_cache_free(lio_qr_cache, qr);
-
-check_rsp_state:
- switch (state) {
- case ISTATE_SEND_DATAIN:
- ret = iscsit_send_data_in(cmd, conn);
- if (ret < 0)
- goto transport_err;
- else if (!ret)
- /* more drs */
- goto check_rsp_state;
- else if (ret == 1) {
- /* all done */
- spin_lock_bh(&cmd->istate_lock);
- cmd->i_state = ISTATE_SENT_STATUS;
- spin_unlock_bh(&cmd->istate_lock);
- continue;
- } else if (ret == 2) {
- /* Still must send status,
- SCF_TRANSPORT_TASK_SENSE was set */
- spin_lock_bh(&cmd->istate_lock);
- cmd->i_state = ISTATE_SEND_STATUS;
- spin_unlock_bh(&cmd->istate_lock);
- state = ISTATE_SEND_STATUS;
- goto check_rsp_state;
- }
-
- break;
- case ISTATE_SEND_STATUS:
- case ISTATE_SEND_STATUS_RECOVERY:
- ret = iscsit_send_status(cmd, conn);
- break;
- case ISTATE_SEND_LOGOUTRSP:
- ret = iscsit_send_logout_response(cmd, conn);
- break;
- case ISTATE_SEND_ASYNCMSG:
- ret = iscsit_send_conn_drop_async_message(
- cmd, conn);
- break;
- case ISTATE_SEND_NOPIN:
- ret = iscsit_send_nopin_response(cmd, conn);
- break;
- case ISTATE_SEND_REJECT:
- ret = iscsit_send_reject(cmd, conn);
- break;
- case ISTATE_SEND_TASKMGTRSP:
- ret = iscsit_send_task_mgt_rsp(cmd, conn);
- if (ret != 0)
- break;
- ret = iscsit_tmr_post_handler(cmd, conn);
- if (ret != 0)
- iscsit_fall_back_to_erl0(conn->sess);
- break;
- case ISTATE_SEND_TEXTRSP:
- ret = iscsit_send_text_rsp(cmd, conn);
- break;
- default:
- pr_err("Unknown Opcode: 0x%02x ITT:"
- " 0x%08x, i_state: %d on CID: %hu\n",
- cmd->iscsi_opcode, cmd->init_task_tag,
- state, conn->cid);
- goto transport_err;
- }
- if (ret < 0)
- goto transport_err;
-
- if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
- iscsit_tx_thread_wait_for_tcp(conn);
- iscsit_unmap_iovec(cmd);
- goto transport_err;
- }
- iscsit_unmap_iovec(cmd);
-
- switch (state) {
- case ISTATE_SEND_LOGOUTRSP:
- if (!iscsit_logout_post_handler(cmd, conn))
- goto restart;
- /* fall through */
- case ISTATE_SEND_STATUS:
- case ISTATE_SEND_ASYNCMSG:
- case ISTATE_SEND_NOPIN:
- case ISTATE_SEND_STATUS_RECOVERY:
- case ISTATE_SEND_TEXTRSP:
- case ISTATE_SEND_TASKMGTRSP:
- spin_lock_bh(&cmd->istate_lock);
- cmd->i_state = ISTATE_SENT_STATUS;
- spin_unlock_bh(&cmd->istate_lock);
- break;
- case ISTATE_SEND_REJECT:
- if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
- cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
- complete(&cmd->reject_comp);
- goto transport_err;
- }
- complete(&cmd->reject_comp);
- break;
- default:
- pr_err("Unknown Opcode: 0x%02x ITT:"
- " 0x%08x, i_state: %d on CID: %hu\n",
- cmd->iscsi_opcode, cmd->init_task_tag,
- cmd->i_state, conn->cid);
- goto transport_err;
- }
+ ret = handle_immediate_queue(conn);
+ if (ret < 0)
+ goto transport_err;
- if (atomic_read(&conn->check_immediate_queue))
- break;
- }
+ ret = handle_response_queue(conn);
+ if (ret == -EAGAIN)
+ goto restart;
+ else if (ret < 0)
+ goto transport_err;
}
transport_err:
--
1.7.1
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