+ enic->intr_count = required_intr;
+ }
+
+ return rc;
+}
+
+/* Initialize the completion queue for an RQ */
+static int
+enic_reinit_rq(struct enic *enic, unsigned int rq_idx)
+{
+ struct vnic_rq *sop_rq, *data_rq;
+ unsigned int cq_idx;
+ int rc = 0;
+
+ sop_rq = &enic->rq[enic_rte_rq_idx_to_sop_idx(rq_idx)];
+ data_rq = &enic->rq[enic_rte_rq_idx_to_data_idx(rq_idx, enic)];
+ cq_idx = enic_cq_rq(enic, rq_idx);
+
+ vnic_cq_clean(&enic->cq[cq_idx]);
+ vnic_cq_init(&enic->cq[cq_idx],
+ 0 /* flow_control_enable */,
+ 1 /* color_enable */,
+ 0 /* cq_head */,
+ 0 /* cq_tail */,
+ 1 /* cq_tail_color */,
+ 0 /* interrupt_enable */,
+ 1 /* cq_entry_enable */,
+ 0 /* cq_message_enable */,
+ 0 /* interrupt offset */,
+ 0 /* cq_message_addr */);
+
+
+ vnic_rq_init_start(sop_rq, enic_cq_rq(enic,
+ enic_rte_rq_idx_to_sop_idx(rq_idx)), 0,
+ sop_rq->ring.desc_count - 1, 1, 0);
+ if (data_rq->in_use) {
+ vnic_rq_init_start(data_rq,
+ enic_cq_rq(enic,
+ enic_rte_rq_idx_to_data_idx(rq_idx, enic)),
+ 0, data_rq->ring.desc_count - 1, 1, 0);
+ }
+
+ rc = enic_alloc_rx_queue_mbufs(enic, sop_rq);
+ if (rc)
+ return rc;
+
+ if (data_rq->in_use) {
+ rc = enic_alloc_rx_queue_mbufs(enic, data_rq);
+ if (rc) {
+ enic_rxmbuf_queue_release(enic, sop_rq);
+ return rc;
+ }
+ }
+
+ return 0;
+}
+
+/* The Cisco NIC can send and receive packets up to a max packet size
+ * determined by the NIC type and firmware. There is also an MTU
+ * configured into the NIC via the CIMC/UCSM management interface
+ * which can be overridden by this function (up to the max packet size).
+ * Depending on the network setup, doing so may cause packet drops
+ * and unexpected behavior.
+ */
+int enic_set_mtu(struct enic *enic, uint16_t new_mtu)
+{
+ unsigned int rq_idx;
+ struct vnic_rq *rq;
+ int rc = 0;
+ uint16_t old_mtu; /* previous setting */
+ uint16_t config_mtu; /* Value configured into NIC via CIMC/UCSM */
+ struct rte_eth_dev *eth_dev = enic->rte_dev;
+
+ old_mtu = eth_dev->data->mtu;
+ config_mtu = enic->config.mtu;
+
+ if (rte_eal_process_type() != RTE_PROC_PRIMARY)
+ return -E_RTE_SECONDARY;
+
+ if (new_mtu > enic->max_mtu) {
+ dev_err(enic,
+ "MTU not updated: requested (%u) greater than max (%u)\n",
+ new_mtu, enic->max_mtu);
+ return -EINVAL;
+ }
+ if (new_mtu < ENIC_MIN_MTU) {
+ dev_info(enic,
+ "MTU not updated: requested (%u) less than min (%u)\n",
+ new_mtu, ENIC_MIN_MTU);
+ return -EINVAL;
+ }
+ if (new_mtu > config_mtu)
+ dev_warning(enic,
+ "MTU (%u) is greater than value configured in NIC (%u)\n",
+ new_mtu, config_mtu);
+
+ /* Update the MTU and maximum packet length */
+ eth_dev->data->mtu = new_mtu;
+ eth_dev->data->dev_conf.rxmode.max_rx_pkt_len =
+ enic_mtu_to_max_rx_pktlen(new_mtu);
+
+ /*
+ * If the device has not started (enic_enable), nothing to do.
+ * Later, enic_enable() will set up RQs reflecting the new maximum
+ * packet length.
+ */
+ if (!eth_dev->data->dev_started)
+ goto set_mtu_done;
+
+ /*
+ * The device has started, re-do RQs on the fly. In the process, we
+ * pick up the new maximum packet length.
+ *
+ * Some applications rely on the ability to change MTU without stopping
+ * the device. So keep this behavior for now.
+ */
+ rte_spinlock_lock(&enic->mtu_lock);
+
+ /* Stop traffic on all RQs */
+ for (rq_idx = 0; rq_idx < enic->rq_count * 2; rq_idx++) {
+ rq = &enic->rq[rq_idx];
+ if (rq->is_sop && rq->in_use) {
+ rc = enic_stop_rq(enic,
+ enic_sop_rq_idx_to_rte_idx(rq_idx));
+ if (rc) {
+ dev_err(enic, "Failed to stop Rq %u\n", rq_idx);
+ goto set_mtu_done;
+ }
+ }