+/*
+ * Find out maximum number of receive and transmit queues which could be
+ * advertised.
+ *
+ * NIC is kept initialized on success to allow other modules acquire
+ * defaults and capabilities.
+ */
+static int
+sfc_estimate_resource_limits(struct sfc_adapter *sa)
+{
+ const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
+ efx_drv_limits_t limits;
+ int rc;
+ uint32_t evq_allocated;
+ uint32_t rxq_allocated;
+ uint32_t txq_allocated;
+
+ memset(&limits, 0, sizeof(limits));
+
+ /* Request at least one Rx and Tx queue */
+ limits.edl_min_rxq_count = 1;
+ limits.edl_min_txq_count = 1;
+ /* Management event queue plus event queue for each Tx and Rx queue */
+ limits.edl_min_evq_count =
+ 1 + limits.edl_min_rxq_count + limits.edl_min_txq_count;
+
+ /* Divide by number of functions to guarantee that all functions
+ * will get promised resources
+ */
+ /* FIXME Divide by number of functions (not 2) below */
+ limits.edl_max_evq_count = encp->enc_evq_limit / 2;
+ SFC_ASSERT(limits.edl_max_evq_count >= limits.edl_min_rxq_count);
+
+ /* Split equally between receive and transmit */
+ limits.edl_max_rxq_count =
+ MIN(encp->enc_rxq_limit, (limits.edl_max_evq_count - 1) / 2);
+ SFC_ASSERT(limits.edl_max_rxq_count >= limits.edl_min_rxq_count);
+
+ limits.edl_max_txq_count =
+ MIN(encp->enc_txq_limit,
+ limits.edl_max_evq_count - 1 - limits.edl_max_rxq_count);
+
+ if (sa->tso)
+ limits.edl_max_txq_count =
+ MIN(limits.edl_max_txq_count,
+ encp->enc_fw_assisted_tso_v2_n_contexts /
+ encp->enc_hw_pf_count);
+
+ SFC_ASSERT(limits.edl_max_txq_count >= limits.edl_min_rxq_count);
+
+ /* Configure the minimum required resources needed for the
+ * driver to operate, and the maximum desired resources that the
+ * driver is capable of using.
+ */
+ efx_nic_set_drv_limits(sa->nic, &limits);
+
+ sfc_log_init(sa, "init nic");
+ rc = efx_nic_init(sa->nic);
+ if (rc != 0)
+ goto fail_nic_init;
+
+ /* Find resource dimensions assigned by firmware to this function */
+ rc = efx_nic_get_vi_pool(sa->nic, &evq_allocated, &rxq_allocated,
+ &txq_allocated);
+ if (rc != 0)
+ goto fail_get_vi_pool;
+
+ /* It still may allocate more than maximum, ensure limit */
+ evq_allocated = MIN(evq_allocated, limits.edl_max_evq_count);
+ rxq_allocated = MIN(rxq_allocated, limits.edl_max_rxq_count);
+ txq_allocated = MIN(txq_allocated, limits.edl_max_txq_count);
+
+ /* Subtract management EVQ not used for traffic */
+ SFC_ASSERT(evq_allocated > 0);
+ evq_allocated--;
+
+ /* Right now we use separate EVQ for Rx and Tx */
+ sa->rxq_max = MIN(rxq_allocated, evq_allocated / 2);
+ sa->txq_max = MIN(txq_allocated, evq_allocated - sa->rxq_max);
+
+ /* Keep NIC initialized */
+ return 0;
+
+fail_get_vi_pool:
+ efx_nic_fini(sa->nic);
+fail_nic_init:
+ return rc;
+}
+
+static int
+sfc_set_drv_limits(struct sfc_adapter *sa)
+{
+ const struct rte_eth_dev_data *data = sa->eth_dev->data;
+ efx_drv_limits_t lim;
+
+ memset(&lim, 0, sizeof(lim));
+
+ /* Limits are strict since take into account initial estimation */
+ lim.edl_min_evq_count = lim.edl_max_evq_count =
+ 1 + data->nb_rx_queues + data->nb_tx_queues;
+ lim.edl_min_rxq_count = lim.edl_max_rxq_count = data->nb_rx_queues;
+ lim.edl_min_txq_count = lim.edl_max_txq_count = data->nb_tx_queues;
+
+ return efx_nic_set_drv_limits(sa->nic, &lim);
+}
+
+static int
+sfc_set_fw_subvariant(struct sfc_adapter *sa)
+{
+ struct sfc_adapter_shared *sas = sfc_sa2shared(sa);
+ const efx_nic_cfg_t *encp = efx_nic_cfg_get(sa->nic);
+ uint64_t tx_offloads = sa->eth_dev->data->dev_conf.txmode.offloads;
+ unsigned int txq_index;
+ efx_nic_fw_subvariant_t req_fw_subvariant;
+ efx_nic_fw_subvariant_t cur_fw_subvariant;
+ int rc;
+
+ if (!encp->enc_fw_subvariant_no_tx_csum_supported) {
+ sfc_info(sa, "no-Tx-checksum subvariant not supported");
+ return 0;
+ }
+
+ for (txq_index = 0; txq_index < sas->txq_count; ++txq_index) {
+ struct sfc_txq_info *txq_info = &sas->txq_info[txq_index];
+
+ if (txq_info->state & SFC_TXQ_INITIALIZED)
+ tx_offloads |= txq_info->offloads;
+ }
+
+ if (tx_offloads & (DEV_TX_OFFLOAD_IPV4_CKSUM |
+ DEV_TX_OFFLOAD_TCP_CKSUM |
+ DEV_TX_OFFLOAD_UDP_CKSUM |
+ DEV_TX_OFFLOAD_OUTER_IPV4_CKSUM))
+ req_fw_subvariant = EFX_NIC_FW_SUBVARIANT_DEFAULT;
+ else
+ req_fw_subvariant = EFX_NIC_FW_SUBVARIANT_NO_TX_CSUM;
+
+ rc = efx_nic_get_fw_subvariant(sa->nic, &cur_fw_subvariant);
+ if (rc != 0) {
+ sfc_err(sa, "failed to get FW subvariant: %d", rc);
+ return rc;
+ }
+ sfc_info(sa, "FW subvariant is %u vs required %u",
+ cur_fw_subvariant, req_fw_subvariant);
+
+ if (cur_fw_subvariant == req_fw_subvariant)
+ return 0;
+
+ rc = efx_nic_set_fw_subvariant(sa->nic, req_fw_subvariant);
+ if (rc != 0) {
+ sfc_err(sa, "failed to set FW subvariant %u: %d",
+ req_fw_subvariant, rc);
+ return rc;
+ }
+ sfc_info(sa, "FW subvariant set to %u", req_fw_subvariant);
+
+ return 0;
+}
+
+static int
+sfc_try_start(struct sfc_adapter *sa)
+{
+ const efx_nic_cfg_t *encp;
+ int rc;
+
+ sfc_log_init(sa, "entry");
+
+ SFC_ASSERT(sfc_adapter_is_locked(sa));
+ SFC_ASSERT(sa->state == SFC_ADAPTER_STARTING);
+
+ sfc_log_init(sa, "set FW subvariant");
+ rc = sfc_set_fw_subvariant(sa);
+ if (rc != 0)
+ goto fail_set_fw_subvariant;
+
+ sfc_log_init(sa, "set resource limits");
+ rc = sfc_set_drv_limits(sa);
+ if (rc != 0)
+ goto fail_set_drv_limits;
+
+ sfc_log_init(sa, "init nic");
+ rc = efx_nic_init(sa->nic);
+ if (rc != 0)
+ goto fail_nic_init;
+
+ encp = efx_nic_cfg_get(sa->nic);
+
+ /*
+ * Refresh (since it may change on NIC reset/restart) a copy of
+ * supported tunnel encapsulations in shared memory to be used
+ * on supported Rx packet type classes get.
+ */
+ sa->priv.shared->tunnel_encaps =
+ encp->enc_tunnel_encapsulations_supported;
+
+ if (encp->enc_tunnel_encapsulations_supported != 0) {
+ sfc_log_init(sa, "apply tunnel config");
+ rc = efx_tunnel_reconfigure(sa->nic);
+ if (rc != 0)
+ goto fail_tunnel_reconfigure;
+ }
+
+ rc = sfc_intr_start(sa);
+ if (rc != 0)
+ goto fail_intr_start;
+
+ rc = sfc_ev_start(sa);
+ if (rc != 0)
+ goto fail_ev_start;
+
+ rc = sfc_port_start(sa);
+ if (rc != 0)
+ goto fail_port_start;
+
+ rc = sfc_rx_start(sa);
+ if (rc != 0)
+ goto fail_rx_start;
+
+ rc = sfc_tx_start(sa);
+ if (rc != 0)
+ goto fail_tx_start;
+
+ rc = sfc_flow_start(sa);
+ if (rc != 0)
+ goto fail_flows_insert;
+
+ sfc_log_init(sa, "done");
+ return 0;
+
+fail_flows_insert:
+ sfc_tx_stop(sa);
+
+fail_tx_start:
+ sfc_rx_stop(sa);
+
+fail_rx_start:
+ sfc_port_stop(sa);
+
+fail_port_start:
+ sfc_ev_stop(sa);
+
+fail_ev_start:
+ sfc_intr_stop(sa);
+
+fail_intr_start:
+fail_tunnel_reconfigure:
+ efx_nic_fini(sa->nic);
+
+fail_nic_init:
+fail_set_drv_limits:
+fail_set_fw_subvariant:
+ sfc_log_init(sa, "failed %d", rc);
+ return rc;
+}
+