RDMA/ocrdma: Add support for interrupt moderation
Add support for interrupt moderation for ocrdma device. Thresholds
for high interrupt rates are static values derived based on experimental
results.
Signed-off-by: Mitesh Ahuja <mitesh.ahuja@emulex.com>
Signed-off-by: Devesh Sharma <devesh.sharma@emulex.com>
Signed-off-by: Selvin Xavier <selvin.xavier@emulex.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
index 6e9680d..189ebc7 100644
--- a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
+++ b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
@@ -960,6 +960,7 @@
} while (budget);
+ eq->aic_obj.eq_intr_cnt++;
ocrdma_ring_eq_db(dev, eq->q.id, true, true, 0);
return IRQ_HANDLED;
}
@@ -3016,6 +3017,82 @@
return status;
}
+static int ocrdma_mbx_modify_eqd(struct ocrdma_dev *dev, struct ocrdma_eq *eq,
+ int num)
+{
+ int i, status = -ENOMEM;
+ struct ocrdma_modify_eqd_req *cmd;
+
+ cmd = ocrdma_init_emb_mqe(OCRDMA_CMD_MODIFY_EQ_DELAY, sizeof(*cmd));
+ if (!cmd)
+ return status;
+
+ ocrdma_init_mch(&cmd->cmd.req, OCRDMA_CMD_MODIFY_EQ_DELAY,
+ OCRDMA_SUBSYS_COMMON, sizeof(*cmd));
+
+ cmd->cmd.num_eq = num;
+ for (i = 0; i < num; i++) {
+ cmd->cmd.set_eqd[i].eq_id = eq[i].q.id;
+ cmd->cmd.set_eqd[i].phase = 0;
+ cmd->cmd.set_eqd[i].delay_multiplier =
+ (eq[i].aic_obj.prev_eqd * 65)/100;
+ }
+ status = ocrdma_mbx_cmd(dev, (struct ocrdma_mqe *)cmd);
+ if (status)
+ goto mbx_err;
+mbx_err:
+ kfree(cmd);
+ return status;
+}
+
+static int ocrdma_modify_eqd(struct ocrdma_dev *dev, struct ocrdma_eq *eq,
+ int num)
+{
+ int num_eqs, i = 0;
+ if (num > 8) {
+ while (num) {
+ num_eqs = min(num, 8);
+ ocrdma_mbx_modify_eqd(dev, &eq[i], num_eqs);
+ i += num_eqs;
+ num -= num_eqs;
+ }
+ } else {
+ ocrdma_mbx_modify_eqd(dev, eq, num);
+ }
+ return 0;
+}
+
+void ocrdma_eqd_set_task(struct work_struct *work)
+{
+ struct ocrdma_dev *dev =
+ container_of(work, struct ocrdma_dev, eqd_work.work);
+ struct ocrdma_eq *eq = 0;
+ int i, num = 0, status = -EINVAL;
+ u64 eq_intr;
+
+ for (i = 0; i < dev->eq_cnt; i++) {
+ eq = &dev->eq_tbl[i];
+ if (eq->aic_obj.eq_intr_cnt > eq->aic_obj.prev_eq_intr_cnt) {
+ eq_intr = eq->aic_obj.eq_intr_cnt -
+ eq->aic_obj.prev_eq_intr_cnt;
+ if ((eq_intr > EQ_INTR_PER_SEC_THRSH_HI) &&
+ (eq->aic_obj.prev_eqd == EQ_AIC_MIN_EQD)) {
+ eq->aic_obj.prev_eqd = EQ_AIC_MAX_EQD;
+ num++;
+ } else if ((eq_intr < EQ_INTR_PER_SEC_THRSH_LOW) &&
+ (eq->aic_obj.prev_eqd == EQ_AIC_MAX_EQD)) {
+ eq->aic_obj.prev_eqd = EQ_AIC_MIN_EQD;
+ num++;
+ }
+ }
+ eq->aic_obj.prev_eq_intr_cnt = eq->aic_obj.eq_intr_cnt;
+ }
+
+ if (num)
+ status = ocrdma_modify_eqd(dev, &dev->eq_tbl[0], num);
+ schedule_delayed_work(&dev->eqd_work, msecs_to_jiffies(1000));
+}
+
int ocrdma_init_hw(struct ocrdma_dev *dev)
{
int status;