On Wed, 14 Apr 2021 22:45:19 -0700 Dexuan Cui wrote:

+	buf = dma_alloc_coherent(gmi->dev, length, &dma_handle,
+				 GFP_KERNEL | __GFP_ZERO);

No need for GFP_ZERO, dma_alloc_coherent() zeroes the memory these days.

+static int mana_gd_register_irq(struct gdma_queue *queue,
+				const struct gdma_queue_spec *spec)
...
+	struct gdma_irq_context *gic;
+
+	struct gdma_context *gc;

Why the empty line?

+	queue = kzalloc(sizeof(*queue), GFP_KERNEL);
+	if (!queue)
+		return -ENOMEM;
+
+	gmi = &queue->mem_info;
+	err = mana_gd_alloc_memory(gc, spec->queue_size, gmi);
+	if (err)
+		return err;

Leaks the memory from 'queue'?

Same code in mana_gd_create_mana_eq(), ...wq_cq(), etc.

+int mana_do_attach(struct net_device *ndev, enum mana_attach_caller caller)
+{
+	struct mana_port_context *apc = netdev_priv(ndev);
+	struct gdma_dev *gd = apc->ac->gdma_dev;
+	u32 max_txq, max_rxq, max_queues;
+	int port_idx = apc->port_idx;
+	u32 num_indirect_entries;
+	int err;
+
+	if (caller == MANA_OPEN)
+		goto start_open;
+
+	err = mana_init_port_context(apc);
+	if (err)
+		return err;
+
+	err = mana_query_vport_cfg(apc, port_idx, &max_txq, &max_rxq,
+				   &num_indirect_entries);
+	if (err) {
+		netdev_err(ndev, "Failed to query info for vPort 0\n");
+		goto reset_apc;
+	}
+
+	max_queues = min_t(u32, max_txq, max_rxq);
+	if (apc->max_queues > max_queues)
+		apc->max_queues = max_queues;
+
+	if (apc->num_queues > apc->max_queues)
+		apc->num_queues = apc->max_queues;
+
+	memcpy(ndev->dev_addr, apc->mac_addr, ETH_ALEN);
+
+	if (caller == MANA_PROBE)
+		return 0;
+
+start_open:

Why keep this as a single function, there is no overlap between what's
done for OPEN and PROBE, it seems.

Similarly detach should probably be split into clearly distinct parts.

+	err = mana_create_eq(apc);
+	if (err)
+		goto reset_apc;
+
+	err = mana_create_vport(apc, ndev);
+	if (err)
+		goto destroy_eq;
+
+	err = netif_set_real_num_tx_queues(ndev, apc->num_queues);
+	if (err)
+		goto destroy_vport;
+
+	err = mana_add_rx_queues(apc, ndev);
+	if (err)
+		goto destroy_vport;
+
+	apc->rss_state = apc->num_queues > 1 ? TRI_STATE_TRUE : TRI_STATE_FALSE;
+
+	err = netif_set_real_num_rx_queues(ndev, apc->num_queues);
+	if (err)
+		goto destroy_vport;
+
+	mana_rss_table_init(apc);
+
+	err = mana_config_rss(apc, TRI_STATE_TRUE, true, true);
+	if (err)
+		goto destroy_vport;
+
+	return 0;
+
+destroy_vport:
+	mana_destroy_vport(apc);
+destroy_eq:
+	mana_destroy_eq(gd->gdma_context, apc);
+reset_apc:
+	if (caller == MANA_OPEN)
+		return err;
+	kfree(apc->rxqs);
+	apc->rxqs = NULL;
+	return err;
+}
+
+int mana_attach(struct net_device *ndev)
+{
+	struct mana_port_context *apc = netdev_priv(ndev);
+	int err;
+
+	ASSERT_RTNL();
+
+	err = mana_do_attach(ndev, MANA_ATTACH);
+	if (err)
+		return err;
+
+	netif_device_attach(ndev);
+
+	apc->port_is_up = apc->port_st_save;
+
+	/* Ensure port state updated before txq state */
+	smp_wmb();
+
+	if (apc->port_is_up) {
+		netif_carrier_on(ndev);
+		netif_tx_wake_all_queues(ndev);
+	}
+
+	return 0;
+}