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Message-ID: <20240518124234.2671651-10-s-vadapalli@ti.com>
Date: Sat, 18 May 2024 18:12:15 +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 09/28] net: ethernet: ti: cpsw-proxy-client: add helper to init TX DMA Channels
Add the "init_tx_chans()" function to initialize the TX DMA Channels.
With the knowledge of the PSI-L Thread IDs allocated to the Client for
each Virtual Port, the TX DMA Channels can be setup using the DMA APIs.
Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---
drivers/net/ethernet/ti/cpsw-proxy-client.c | 115 ++++++++++++++++++++
1 file changed, 115 insertions(+)
diff --git a/drivers/net/ethernet/ti/cpsw-proxy-client.c b/drivers/net/ethernet/ti/cpsw-proxy-client.c
index b057cf4b7bea..efb44ff04b6a 100644
--- a/drivers/net/ethernet/ti/cpsw-proxy-client.c
+++ b/drivers/net/ethernet/ti/cpsw-proxy-client.c
@@ -9,11 +9,20 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rpmsg.h>
+#include <linux/dma/k3-udma-glue.h>
#include "ethfw_abi.h"
+#include "k3-cppi-desc-pool.h"
#define ETHFW_RESPONSE_TIMEOUT_MS 500
+#define PS_DATA_SIZE 16
+#define SW_DATA_SIZE 16
+
+#define MAX_TX_DESC 500
+
+#define CHAN_NAME_LEN 128
+
enum virtual_port_type {
VIRT_SWITCH_PORT,
VIRT_MAC_ONLY_PORT,
@@ -46,8 +55,14 @@ struct rx_dma_chan {
struct tx_dma_chan {
struct virtual_port *vport;
+ struct device *dev;
+ struct k3_cppi_desc_pool *desc_pool;
+ struct k3_udma_glue_tx_channel *tx_chan;
u32 rel_chan_idx;
u32 thread_id;
+ u32 num_descs;
+ unsigned int irq;
+ char tx_chan_name[CHAN_NAME_LEN];
bool in_use;
};
@@ -68,6 +83,7 @@ struct virtual_port {
struct cpsw_proxy_priv {
struct rpmsg_device *rpdev;
struct device *dev;
+ struct device_node *dma_node;
struct virtual_port *virt_ports;
struct cpsw_proxy_req_params req_params;
struct mutex req_params_mutex; /* Request params mutex */
@@ -79,6 +95,7 @@ struct cpsw_proxy_priv {
u32 num_switch_ports;
u32 num_mac_ports;
u32 num_virt_ports;
+ u32 num_active_tx_chans;
};
static int cpsw_proxy_client_cb(struct rpmsg_device *rpdev, void *data,
@@ -605,6 +622,104 @@ static int allocate_port_resources(struct cpsw_proxy_priv *proxy_priv)
return -EIO;
}
+static void free_tx_chns(void *data)
+{
+ struct cpsw_proxy_priv *proxy_priv = data;
+ struct tx_dma_chan *tx_chn;
+ struct virtual_port *vport;
+ u32 i, j;
+
+ for (i = 0; i < proxy_priv->num_virt_ports; i++) {
+ vport = &proxy_priv->virt_ports[i];
+ for (j = 0; j < vport->num_tx_chan; j++) {
+ tx_chn = &vport->tx_chans[j];
+
+ if (!IS_ERR_OR_NULL(tx_chn->desc_pool))
+ k3_cppi_desc_pool_destroy(tx_chn->desc_pool);
+
+ if (!IS_ERR_OR_NULL(tx_chn->tx_chan))
+ k3_udma_glue_release_tx_chn(tx_chn->tx_chan);
+
+ memset(tx_chn, 0, sizeof(*tx_chn));
+ }
+ }
+}
+
+static int init_tx_chans(struct cpsw_proxy_priv *proxy_priv)
+{
+ u32 max_desc_num = ALIGN(MAX_TX_DESC, MAX_SKB_FRAGS);
+ struct k3_udma_glue_tx_channel_cfg tx_cfg = { 0 };
+ struct device *dev = proxy_priv->dev;
+ u32 hdesc_size, tx_chn_num, i, j;
+ char tx_chn_name[CHAN_NAME_LEN];
+ struct k3_ring_cfg ring_cfg = {
+ .elm_size = K3_RINGACC_RING_ELSIZE_8,
+ .mode = K3_RINGACC_RING_MODE_RING,
+ .flags = 0
+ };
+ struct tx_dma_chan *tx_chn;
+ struct virtual_port *vport;
+ int ret = 0, ret1;
+
+ for (i = 0; i < proxy_priv->num_virt_ports; i++) {
+ vport = &proxy_priv->virt_ports[i];
+
+ for (j = 0; j < vport->num_tx_chan; j++) {
+ tx_chn = &vport->tx_chans[j];
+
+ tx_chn_num = proxy_priv->num_active_tx_chans++;
+ snprintf(tx_chn_name, sizeof(tx_chn_name), "tx%u-virt-port-%u",
+ tx_chn_num, vport->port_id);
+ strscpy(tx_chn->tx_chan_name, tx_chn_name, sizeof(tx_chn->tx_chan_name));
+
+ hdesc_size = cppi5_hdesc_calc_size(true, PS_DATA_SIZE, SW_DATA_SIZE);
+
+ tx_cfg.swdata_size = SW_DATA_SIZE;
+ tx_cfg.tx_cfg = ring_cfg;
+ tx_cfg.txcq_cfg = ring_cfg;
+ tx_cfg.tx_cfg.size = max_desc_num;
+ tx_cfg.txcq_cfg.size = max_desc_num;
+
+ tx_chn->dev = dev;
+ tx_chn->num_descs = max_desc_num;
+ tx_chn->desc_pool = k3_cppi_desc_pool_create_name(dev,
+ tx_chn->num_descs,
+ hdesc_size,
+ tx_chn_name);
+ if (IS_ERR(tx_chn->desc_pool)) {
+ ret = PTR_ERR(tx_chn->desc_pool);
+ dev_err(dev, "failed to create tx pool %d\n", ret);
+ goto err;
+ }
+
+ tx_chn->tx_chan =
+ k3_udma_glue_request_tx_chn_for_thread_id(dev, &tx_cfg,
+ proxy_priv->dma_node,
+ tx_chn->thread_id);
+ if (IS_ERR(tx_chn->tx_chan)) {
+ ret = PTR_ERR(tx_chn->tx_chan);
+ dev_err(dev, "Failed to request tx dma channel %d\n", ret);
+ goto err;
+ }
+
+ tx_chn->irq = k3_udma_glue_tx_get_irq(tx_chn->tx_chan);
+ if (tx_chn->irq <= 0) {
+ dev_err(dev, "Failed to get tx dma irq %d\n", tx_chn->irq);
+ ret = -ENXIO;
+ }
+ }
+ }
+
+err:
+ ret1 = devm_add_action(dev, free_tx_chns, proxy_priv);
+ if (ret1) {
+ dev_err(dev, "failed to add free_tx_chns action %d", ret1);
+ return ret1;
+ }
+
+ return ret;
+}
+
static int cpsw_proxy_client_probe(struct rpmsg_device *rpdev)
{
struct cpsw_proxy_priv *proxy_priv;
--
2.40.1
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