linux-kernel - [RFC PATCH net-next 07/28] net: ethernet: ti: cpsw-proxy-client: add helper to attach virtual ports

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Date: Sat, 18 May 2024 18:12:13 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <corbet@....net>, <rogerq@...nel.org>,
        <danishanwar@...com>, <vladimir.oltean@....com>
CC: <netdev@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <vigneshr@...com>, <misael.lopez@...com>, <srk@...com>,
        <s-vadapalli@...com>
Subject: [RFC PATCH net-next 07/28] net: ethernet: ti: cpsw-proxy-client: add helper to attach virtual ports

Add the helper function "attach_virtual_ports()" to send the
ETHFW_ATTACH_VIRT_PORT request for each virtual port and store details
of features corresponding to the virtual port, the number of TX DMA
Channels allocated to the virtual port and the number of RX DMA Channels
allocated to the virtual port. If attaching any of the virtual ports
fails, detach all previously attached virtual ports.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---
 drivers/net/ethernet/ti/cpsw-proxy-client.c | 90 +++++++++++++++++++++
 1 file changed, 90 insertions(+)

diff --git a/drivers/net/ethernet/ti/cpsw-proxy-client.c b/drivers/net/ethernet/ti/cpsw-proxy-client.c
index 262fbf59ac72..691b36bc3715 100644
--- a/drivers/net/ethernet/ti/cpsw-proxy-client.c
+++ b/drivers/net/ethernet/ti/cpsw-proxy-client.c
@@ -35,10 +35,26 @@ struct cpsw_proxy_req_params {
 	u8		ipv4_addr[ETHFW_IPV4ADDRLEN];
 };
 
+struct rx_dma_chan {
+	struct virtual_port		*vport;
+	u32				rel_chan_idx;
+};
+
+struct tx_dma_chan {
+	struct virtual_port		*vport;
+	u32				rel_chan_idx;
+};
+
 struct virtual_port {
 	struct cpsw_proxy_priv		*proxy_priv;
+	struct rx_dma_chan		*rx_chans;
+	struct tx_dma_chan		*tx_chans;
 	enum virtual_port_type		port_type;
 	u32				port_id;
+	u32				port_token;
+	u32				port_features;
+	u32				num_rx_chan;
+	u32				num_tx_chan;
 };
 
 struct cpsw_proxy_priv {
@@ -350,6 +366,80 @@ static int get_virtual_port_info(struct cpsw_proxy_priv *proxy_priv)
 	return 0;
 }
 
+static int attach_virtual_ports(struct cpsw_proxy_priv *proxy_priv)
+{
+	struct cpsw_proxy_req_params *req_p;
+	struct attach_response *att_resp;
+	struct rx_dma_chan *rx_chn;
+	struct tx_dma_chan *tx_chn;
+	struct virtual_port *vport;
+	struct message resp_msg;
+	unsigned int i, j;
+	u32 port_id;
+	int ret;
+
+	for (i = 0; i < proxy_priv->num_virt_ports; i++) {
+		vport = &proxy_priv->virt_ports[i];
+		port_id = vport->port_id;
+
+		mutex_lock(&proxy_priv->req_params_mutex);
+		req_p = &proxy_priv->req_params;
+		req_p->port_id = port_id;
+		req_p->request_type = ETHFW_VIRT_PORT_ATTACH;
+		ret = send_request_get_response(proxy_priv, &resp_msg);
+		mutex_unlock(&proxy_priv->req_params_mutex);
+
+		if (ret) {
+			dev_err(proxy_priv->dev, "attaching virtual port failed\n");
+			goto err;
+		}
+
+		att_resp = (struct attach_response *)&resp_msg;
+		vport->port_token = att_resp->response_msg_hdr.msg_hdr.token;
+		vport->port_features = att_resp->features;
+		vport->num_tx_chan = att_resp->num_tx_chan;
+		vport->num_rx_chan = att_resp->num_rx_flow;
+
+		vport->rx_chans = devm_kcalloc(proxy_priv->dev,
+					       vport->num_rx_chan,
+					       sizeof(*vport->rx_chans),
+					       GFP_KERNEL);
+		for (j = 0; j < vport->num_rx_chan; j++) {
+			rx_chn = &vport->rx_chans[j];
+			rx_chn->vport = vport;
+			rx_chn->rel_chan_idx = j;
+		}
+
+		vport->tx_chans = devm_kcalloc(proxy_priv->dev,
+					       vport->num_tx_chan,
+					       sizeof(*vport->tx_chans),
+					       GFP_KERNEL);
+		for (j = 0; j < vport->num_tx_chan; j++) {
+			tx_chn = &vport->tx_chans[j];
+			tx_chn->vport = vport;
+			tx_chn->rel_chan_idx = j;
+		}
+	}
+
+	return 0;
+
+err:
+	/* Detach virtual ports which were successfully attached */
+	while (i--) {
+		vport = &proxy_priv->virt_ports[i];
+		port_id = vport->port_id;
+		mutex_lock(&proxy_priv->req_params_mutex);
+		req_p = &proxy_priv->req_params;
+		req_p->request_type = ETHFW_VIRT_PORT_DETACH;
+		req_p->token = vport->port_token;
+		ret = send_request_get_response(proxy_priv, &resp_msg);
+		mutex_unlock(&proxy_priv->req_params_mutex);
+		if (ret)
+			dev_err(proxy_priv->dev, "detaching virtual port %u failed\n", port_id);
+	}
+	return -EIO;
+}
+
 static int cpsw_proxy_client_probe(struct rpmsg_device *rpdev)
 {
 	struct cpsw_proxy_priv *proxy_priv;
-- 
2.40.1