[SCSI] be2iscsi: Enable async mode for mcc rings
This patches enables async mode for mcc rings so that
multiple requests can be queued.
Signed-off-by: Jayamohan Kallickal <jayamohank@serverengines.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/be2iscsi/be_cmds.c b/drivers/scsi/be2iscsi/be_cmds.c
index f008708..d4a0d1d 100644
--- a/drivers/scsi/be2iscsi/be_cmds.c
+++ b/drivers/scsi/be2iscsi/be_cmds.c
@@ -19,7 +19,7 @@
#include "be_mgmt.h"
#include "be_main.h"
-static void be_mcc_notify(struct beiscsi_hba *phba)
+void be_mcc_notify(struct beiscsi_hba *phba)
{
struct be_queue_info *mccq = &phba->ctrl.mcc_obj.q;
u32 val = 0;
@@ -29,6 +29,52 @@
iowrite32(val, phba->db_va + DB_MCCQ_OFFSET);
}
+unsigned int alloc_mcc_tag(struct beiscsi_hba *phba)
+{
+ unsigned int tag = 0;
+ unsigned int num = 0;
+
+mcc_tag_rdy:
+ if (phba->ctrl.mcc_tag_available) {
+ tag = phba->ctrl.mcc_tag[phba->ctrl.mcc_alloc_index];
+ phba->ctrl.mcc_tag[phba->ctrl.mcc_alloc_index] = 0;
+ phba->ctrl.mcc_numtag[tag] = 0;
+ } else {
+ udelay(100);
+ num++;
+ if (num < mcc_timeout)
+ goto mcc_tag_rdy;
+ }
+ if (tag) {
+ phba->ctrl.mcc_tag_available--;
+ if (phba->ctrl.mcc_alloc_index == (MAX_MCC_CMD - 1))
+ phba->ctrl.mcc_alloc_index = 0;
+ else
+ phba->ctrl.mcc_alloc_index++;
+ }
+ return tag;
+}
+
+void free_mcc_tag(struct be_ctrl_info *ctrl, unsigned int tag)
+{
+ spin_lock(&ctrl->mbox_lock);
+ tag = tag & 0x000000FF;
+ 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->mbox_lock);
+}
+
+bool is_link_state_evt(u32 trailer)
+{
+ return (((trailer >> ASYNC_TRAILER_EVENT_CODE_SHIFT) &
+ ASYNC_TRAILER_EVENT_CODE_MASK) ==
+ ASYNC_EVENT_CODE_LINK_STATE);
+}
+
static inline bool be_mcc_compl_is_new(struct be_mcc_compl *compl)
{
if (compl->flags != 0) {
@@ -64,12 +110,30 @@
return 0;
}
-
-static inline bool is_link_state_evt(u32 trailer)
+int be_mcc_compl_process_isr(struct be_ctrl_info *ctrl,
+ struct be_mcc_compl *compl)
{
- return (((trailer >> ASYNC_TRAILER_EVENT_CODE_SHIFT) &
- ASYNC_TRAILER_EVENT_CODE_MASK) ==
- ASYNC_EVENT_CODE_LINK_STATE);
+ u16 compl_status, extd_status;
+ unsigned short tag;
+
+ be_dws_le_to_cpu(compl, 4);
+
+ compl_status = (compl->status >> CQE_STATUS_COMPL_SHIFT) &
+ CQE_STATUS_COMPL_MASK;
+ /* The ctrl.mcc_numtag[tag] is filled with
+ * [31] = valid, [30:24] = Rsvd, [23:16] = wrb, [15:8] = extd_status,
+ * [7:0] = compl_status
+ */
+ tag = (compl->tag0 & 0x000000FF);
+ extd_status = (compl->status >> CQE_STATUS_EXTD_SHIFT) &
+ CQE_STATUS_EXTD_MASK;
+
+ ctrl->mcc_numtag[tag] = 0x80000000;
+ ctrl->mcc_numtag[tag] |= (compl->tag0 & 0x00FF0000);
+ ctrl->mcc_numtag[tag] |= (extd_status & 0x000000FF) << 8;
+ ctrl->mcc_numtag[tag] |= (compl_status & 0x000000FF);
+ wake_up_interruptible(&ctrl->mcc_wait[tag]);
+ return 0;
}
static struct be_mcc_compl *be_mcc_compl_get(struct beiscsi_hba *phba)
@@ -89,7 +153,7 @@
iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_CONN_FAILED);
}
-static void beiscsi_async_link_state_process(struct beiscsi_hba *phba,
+void beiscsi_async_link_state_process(struct beiscsi_hba *phba,
struct be_async_event_link_state *evt)
{
switch (evt->port_link_status) {
@@ -162,7 +226,6 @@
/* Wait till no more pending mcc requests are present */
static int be_mcc_wait_compl(struct beiscsi_hba *phba)
{
-#define mcc_timeout 120000 /* 5s timeout */
int i, status;
for (i = 0; i < mcc_timeout; i++) {
status = beiscsi_process_mcc(phba);
@@ -372,9 +435,10 @@
BUG_ON(atomic_read(&mccq->used) >= mccq->len);
wrb = queue_head_node(mccq);
+ memset(wrb, 0, sizeof(*wrb));
+ wrb->tag0 = (mccq->head & 0x000000FF) << 16;
queue_head_inc(mccq);
atomic_inc(&mccq->used);
- memset(wrb, 0, sizeof(*wrb));
return wrb;
}