On Mon, Feb 01, 2016 at 03:42:45PM +0530, Jitendra Bhivare wrote:
> be_mcc_compl_poll waits till 'used' count of MCC WRBQ is zero. This is to
> determine the completion of an MCC sent.
>
> Change function to poll for the tag of MCC sent, instead, and wait till
> its tag_state is cleared.
>
> Signed-off-by: Jitendra Bhivare <jitendra.bhiv...@avagotech.com>
> ---
> drivers/scsi/be2iscsi/be_cmds.c | 92
> +++++++++++++++++++++--------------------
> 1 file changed, 47 insertions(+), 45 deletions(-)
>
> diff --git a/drivers/scsi/be2iscsi/be_cmds.c b/drivers/scsi/be2iscsi/be_cmds.c
> index 12b60dd..60db2de 100644
> --- a/drivers/scsi/be2iscsi/be_cmds.c
> +++ b/drivers/scsi/be2iscsi/be_cmds.c
> @@ -104,19 +104,6 @@ int be_chk_reset_complete(struct beiscsi_hba *phba)
> return 0;
> }
>
> -void be_mcc_notify(struct beiscsi_hba *phba, unsigned int tag)
> -{
> - struct be_queue_info *mccq = &phba->ctrl.mcc_obj.q;
> - u32 val = 0;
> -
> - set_bit(MCC_TAG_STATE_RUNNING, &phba->ctrl.ptag_state[tag].tag_state);
> - val |= mccq->id & DB_MCCQ_RING_ID_MASK;
> - val |= 1 << DB_MCCQ_NUM_POSTED_SHIFT;
> - /* ring doorbell after all of request and state is written */
> - wmb();
> - iowrite32(val, phba->db_va + DB_MCCQ_OFFSET);
> -}
> -
> unsigned int alloc_mcc_tag(struct beiscsi_hba *phba)
> {
> unsigned int tag = 0;
> @@ -139,6 +126,28 @@ unsigned int alloc_mcc_tag(struct beiscsi_hba *phba)
> return tag;
> }
>
> +void free_mcc_tag(struct be_ctrl_info *ctrl, unsigned int tag)
> +{
> + spin_lock_bh(&ctrl->mcc_lock);
> + tag = tag & MCC_Q_CMD_TAG_MASK;
> + ctrl->mcc_tag[ctrl->mcc_free_index] = tag;
> + if (ctrl->mcc_free_index == (MAX_MCC_CMD - 1))
> + ctrl->mcc_free_index = 0;
> + else
> + ctrl->mcc_free_index++;
> + ctrl->mcc_tag_available++;
> + spin_unlock_bh(&ctrl->mcc_lock);
> +}
> +
> +/**
> + * beiscsi_fail_session(): Closing session with appropriate error
> + * @cls_session: ptr to session
> + **/
> +void beiscsi_fail_session(struct iscsi_cls_session *cls_session)
> +{
> + iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_CONN_FAILED);
> +}
> +
> /*
> * beiscsi_mccq_compl_wait()- Process completion in MCC CQ
> * @phba: Driver private structure
> @@ -254,19 +263,6 @@ int beiscsi_mccq_compl_wait(struct beiscsi_hba *phba,
> return rc;
> }
>
> -void free_mcc_tag(struct be_ctrl_info *ctrl, unsigned int tag)
> -{
> - spin_lock(&ctrl->mcc_lock);
> - tag = tag & MCC_Q_CMD_TAG_MASK;
> - ctrl->mcc_tag[ctrl->mcc_free_index] = tag;
> - if (ctrl->mcc_free_index == (MAX_MCC_CMD - 1))
> - ctrl->mcc_free_index = 0;
> - else
> - ctrl->mcc_free_index++;
> - ctrl->mcc_tag_available++;
> - spin_unlock(&ctrl->mcc_lock);
> -}
> -
> static inline bool be_mcc_compl_is_new(struct be_mcc_compl *compl)
> {
> if (compl->flags != 0) {
> @@ -328,15 +324,6 @@ static int beiscsi_process_mbox_compl(struct
> be_ctrl_info *ctrl,
> return 0;
> }
>
> -/**
> - * beiscsi_fail_session(): Closing session with appropriate error
> - * @cls_session: ptr to session
> - **/
> -void beiscsi_fail_session(struct iscsi_cls_session *cls_session)
> -{
> - iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_CONN_FAILED);
> -}
> -
> static void beiscsi_process_async_link(struct beiscsi_hba *phba,
> struct be_mcc_compl *compl)
> {
> @@ -532,6 +519,7 @@ int beiscsi_process_mcc_compl(struct be_ctrl_info *ctrl,
> **/
> int be_mcc_compl_poll(struct beiscsi_hba *phba, unsigned int tag)
> {
> + struct be_ctrl_info *ctrl = &phba->ctrl;
> int i;
>
> for (i = 0; i < mcc_timeout; i++) {
> @@ -540,19 +528,33 @@ int be_mcc_compl_poll(struct beiscsi_hba *phba,
> unsigned int tag)
>
> beiscsi_process_mcc_cq(phba);
>
> - if (atomic_read(&phba->ctrl.mcc_obj.q.used) == 0)
> + if (!test_bit(MCC_TAG_STATE_RUNNING,
> + &ctrl->ptag_state[tag].tag_state))
> break;
> udelay(100);
> }
> - if (i == mcc_timeout) {
> - beiscsi_log(phba, KERN_ERR,
> - BEISCSI_LOG_CONFIG | BEISCSI_LOG_MBOX,
> - "BC_%d : FW Timed Out\n");
> - phba->fw_timeout = true;
> - beiscsi_ue_detect(phba);
> - return -EBUSY;
> - }
> - return 0;
> +
> + if (i < mcc_timeout)
> + return 0;
> +
> + beiscsi_log(phba, KERN_ERR, BEISCSI_LOG_CONFIG | BEISCSI_LOG_MBOX,
> + "BC_%d : FW Timed Out\n");
> + phba->fw_timeout = true;
> + beiscsi_ue_detect(phba);
> + return -EBUSY;
> +}
> +
> +void be_mcc_notify(struct beiscsi_hba *phba, unsigned int tag)
> +{
> + struct be_queue_info *mccq = &phba->ctrl.mcc_obj.q;
> + u32 val = 0;
> +
> + set_bit(MCC_TAG_STATE_RUNNING, &phba->ctrl.ptag_state[tag].tag_state);
> + val |= mccq->id & DB_MCCQ_RING_ID_MASK;
> + val |= 1 << DB_MCCQ_NUM_POSTED_SHIFT;
> + /* make request available for DMA */
> + wmb();
> + iowrite32(val, phba->db_va + DB_MCCQ_OFFSET);
> }
>
> /*
> --
> 2.5.0
>
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Reviewed-by: Johannes Thumshirn <jthumsh...@suse.de>
--
Johannes Thumshirn Storage
jthumsh...@suse.de +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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