{
struct qman_fq *fq;
unsigned int pkts = 0;
- int ret;
+ int num_rx_bufs, ret;
struct qm_dqrr_entry *dq;
+ uint32_t vdqcr_flags = 0;
fq = &qp->outq;
- ret = qman_set_vdq(fq, (nb_ops > DPAA_MAX_DEQUEUE_NUM_FRAMES) ?
- DPAA_MAX_DEQUEUE_NUM_FRAMES : nb_ops);
+ /*
+ * Until request for four buffers, we provide exact number of buffers.
+ * Otherwise we do not set the QM_VDQCR_EXACT flag.
+ * Not setting QM_VDQCR_EXACT flag can provide two more buffers than
+ * requested, so we request two less in this case.
+ */
+ if (nb_ops < 4) {
+ vdqcr_flags = QM_VDQCR_EXACT;
+ num_rx_bufs = nb_ops;
+ } else {
+ num_rx_bufs = nb_ops > DPAA_MAX_DEQUEUE_NUM_FRAMES ?
+ (DPAA_MAX_DEQUEUE_NUM_FRAMES - 2) : (nb_ops - 2);
+ }
+ ret = qman_set_vdq(fq, num_rx_bufs, vdqcr_flags);
if (ret)
return 0;