On Tue, 2012-04-03 at 15:51 -0700, Andy Grover wrote:
> 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(-)
>
Nice cleanup work here btw to logically split up existing immediate and
response and queue processing.
--nab
> 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:
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