bus/dpaa: make vdqcr configurable

[dpdk.git] / drivers / crypto / dpaa_sec / dpaa_sec.c

diff --git a/drivers/crypto/dpaa_sec/dpaa_sec.c b/drivers/crypto/dpaa_sec/dpaa_sec.c
index f8536b9..f571050 100644 (file)
--- a/drivers/crypto/dpaa_sec/dpaa_sec.c
+++ b/drivers/crypto/dpaa_sec/dpaa_sec.c
@@ -526,12 +526,25 @@ dpaa_sec_deq(struct dpaa_sec_qp *qp, struct rte_crypto_op **ops, int nb_ops)
 {
        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;