-/* ena_com_calculate_interrupt_delay - Calculate new interrupt delay
- * @ena_dev: ENA communication layer struct
- * @pkts: Number of packets since the last update
- * @bytes: Number of bytes received since the last update.
- * @smoothed_interval: Returned interval
- * @moder_tbl_idx: Current table level as input update new level as return
- * value.
- */
-static inline void ena_com_calculate_interrupt_delay(struct ena_com_dev *ena_dev,
- unsigned int pkts,
- unsigned int bytes,
- unsigned int *smoothed_interval,
- unsigned int *moder_tbl_idx)
-{
- enum ena_intr_moder_level curr_moder_idx, new_moder_idx;
- struct ena_intr_moder_entry *curr_moder_entry;
- struct ena_intr_moder_entry *pred_moder_entry;
- struct ena_intr_moder_entry *new_moder_entry;
- struct ena_intr_moder_entry *intr_moder_tbl = ena_dev->intr_moder_tbl;
- unsigned int interval;
-
- /* We apply adaptive moderation on Rx path only.
- * Tx uses static interrupt moderation.
- */
- if (!pkts || !bytes)
- /* Tx interrupt, or spurious interrupt,
- * in both cases we just use same delay values
- */
- return;
-
- curr_moder_idx = (enum ena_intr_moder_level)(*moder_tbl_idx);
- if (unlikely(curr_moder_idx >= ENA_INTR_MAX_NUM_OF_LEVELS)) {
- ena_trc_err("Wrong moderation index %u\n", curr_moder_idx);
- return;
- }
-
- curr_moder_entry = &intr_moder_tbl[curr_moder_idx];
- new_moder_idx = curr_moder_idx;
-
- if (curr_moder_idx == ENA_INTR_MODER_LOWEST) {
- if ((pkts > curr_moder_entry->pkts_per_interval) ||
- (bytes > curr_moder_entry->bytes_per_interval))
- new_moder_idx =
- (enum ena_intr_moder_level)(curr_moder_idx + ENA_INTR_MODER_LEVEL_STRIDE);
- } else {
- pred_moder_entry = &intr_moder_tbl[curr_moder_idx - ENA_INTR_MODER_LEVEL_STRIDE];
-
- if ((pkts <= pred_moder_entry->pkts_per_interval) ||
- (bytes <= pred_moder_entry->bytes_per_interval))
- new_moder_idx =
- (enum ena_intr_moder_level)(curr_moder_idx - ENA_INTR_MODER_LEVEL_STRIDE);
- else if ((pkts > curr_moder_entry->pkts_per_interval) ||
- (bytes > curr_moder_entry->bytes_per_interval)) {
- if (curr_moder_idx != ENA_INTR_MODER_HIGHEST)
- new_moder_idx =
- (enum ena_intr_moder_level)(curr_moder_idx + ENA_INTR_MODER_LEVEL_STRIDE);
- }
- }
- new_moder_entry = &intr_moder_tbl[new_moder_idx];
-
- interval = new_moder_entry->intr_moder_interval;
- *smoothed_interval = (
- (interval * ENA_INTR_DELAY_NEW_VALUE_WEIGHT +
- ENA_INTR_DELAY_OLD_VALUE_WEIGHT * (*smoothed_interval)) + 5) /
- 10;
-
- *moder_tbl_idx = new_moder_idx;
-}
-