[PATCH net-next v2 04/15] ibmveth: Refactor TX resource allocation in open/close paths

[Mingming Cao <mmc@linux.ibm.com>]

Same story as the RX refactor: pull TX LTB alloc out of open/close.

ibmveth_alloc_tx_resources() / ibmveth_free_tx_resources() walk
real_num_tx_queues so ethtool TX channel changes keep working. Hooked
into open/close in the next patch.

No MQ RX behaviour change — TX was already multi-queue capable via
ethtool -L. This patch only tidies the open/close path ahead of the
RX helper wiring in the next patch.

Signed-off-by: Mingming Cao <mmc@linux.ibm.com>
Reviewed-by: Dave Marquardt <davemarq@linux.ibm.com>
---
 drivers/net/ethernet/ibm/ibmveth.c | 43 ++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c
index b5ae979c1f82..63b0184c622a 100644
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c
@@ -1038,6 +1038,49 @@ static int ibmveth_allocate_tx_ltb(struct ibmveth_adapter *adapter, int idx)
 	return 0;
 }
 
+/**
+ * ibmveth_alloc_tx_resources - Allocate TX resources for all queues
+ * @adapter: ibmveth adapter structure
+ *
+ * Allocates TX Long Term Buffers (LTBs) for all TX queues.
+ *
+ * Return: 0 on success, -ENOMEM on failure
+ */
+static int __maybe_unused
+ibmveth_alloc_tx_resources(struct ibmveth_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+	int i;
+
+	for (i = 0; i < netdev->real_num_tx_queues; i++) {
+		if (ibmveth_allocate_tx_ltb(adapter, i))
+			goto err_free_ltbs;
+	}
+
+	return 0;
+
+err_free_ltbs:
+	while (--i >= 0)
+		ibmveth_free_tx_ltb(adapter, i);
+	return -ENOMEM;
+}
+
+/**
+ * ibmveth_free_tx_resources - Free TX resources for all queues
+ * @adapter: ibmveth adapter structure
+ *
+ * Frees TX Long Term Buffers (LTBs) for all TX queues.
+ */
+static void __maybe_unused
+ibmveth_free_tx_resources(struct ibmveth_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+	int i;
+
+	for (i = 0; i < netdev->real_num_tx_queues; i++)
+		ibmveth_free_tx_ltb(adapter, i);
+}
+
 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
 				   union ibmveth_buf_desc rxq_desc,
 				   u64 mac_address)
-- 
2.39.3 (Apple Git-146)