+/* 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;
+ }
+ }
+ }
+
+ /* replace Rx function with a no-op to avoid getting stale pkts */
+ eth_dev->rx_pkt_burst = enic_dummy_recv_pkts;
+ rte_mb();
+
+ /* Allow time for threads to exit the real Rx function. */
+ usleep(100000);
+
+ /* now it is safe to reconfigure the RQs */
+
+
+ /* free and reallocate RQs with the new MTU */
+ for (rq_idx = 0; rq_idx < enic->rq_count; rq_idx++) {
+ rq = &enic->rq[enic_rte_rq_idx_to_sop_idx(rq_idx)];
+ if (!rq->in_use)
+ continue;
+
+ enic_free_rq(rq);
+ rc = enic_alloc_rq(enic, rq_idx, rq->socket_id, rq->mp,
+ rq->tot_nb_desc, rq->rx_free_thresh);
+ if (rc) {
+ dev_err(enic,
+ "Fatal MTU alloc error- No traffic will pass\n");
+ goto set_mtu_done;
+ }
+
+ rc = enic_reinit_rq(enic, rq_idx);
+ if (rc) {
+ dev_err(enic,
+ "Fatal MTU RQ reinit- No traffic will pass\n");
+ goto set_mtu_done;
+ }
+ }
+
+ /* put back the real receive function */
+ rte_mb();
+ pick_rx_handler(enic);
+ rte_mb();
+
+ /* restart Rx traffic */
+ for (rq_idx = 0; rq_idx < enic->rq_count; rq_idx++) {
+ rq = &enic->rq[enic_rte_rq_idx_to_sop_idx(rq_idx)];
+ if (rq->is_sop && rq->in_use)
+ enic_start_rq(enic, rq_idx);
+ }
+
+set_mtu_done:
+ dev_info(enic, "MTU changed from %u to %u\n", old_mtu, new_mtu);
+ rte_spinlock_unlock(&enic->mtu_lock);
+ return rc;
+}
+