[RFC 2/9] staging: dpaa2-switch: setup buffer pool for control traffic

Ioana Ciornei
2020-11-04T16:57:35Z

Allocate and setup a buffer pool, needed on the Rx path of the control
interface. Also, define the Rx buffer size seen by the WRIOP from the
PAGE_SIZE buffers seeded.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
---
drivers/staging/fsl-dpaa2/ethsw/dpsw-cmd.h | 12 +++
drivers/staging/fsl-dpaa2/ethsw/dpsw.c | 31 ++++++++
drivers/staging/fsl-dpaa2/ethsw/dpsw.h | 26 +++++++
drivers/staging/fsl-dpaa2/ethsw/ethsw.c | 90 ++++++++++++++++++++++
drivers/staging/fsl-dpaa2/ethsw/ethsw.h | 10 +++
5 files changed, 169 insertions(+)

diff --git a/drivers/staging/fsl-dpaa2/ethsw/dpsw-cmd.h b/drivers/staging/fsl-dpaa2/ethsw/dpsw-cmd.h
index 24c902eb63e3..e27e86d5d4fb 100644
--- a/drivers/staging/fsl-dpaa2/ethsw/dpsw-cmd.h
+++ b/drivers/staging/fsl-dpaa2/ethsw/dpsw-cmd.h
@@ -8,6 +8,8 @@
#ifndef __FSL_DPSW_CMD_H
#define __FSL_DPSW_CMD_H

+#include "dpsw.h"
+
/* DPSW Version */
#define DPSW_VER_MAJOR 8
#define DPSW_VER_MINOR 1
@@ -74,6 +76,7 @@
#define DPSW_CMDID_IF_SET_PRIMARY_MAC_ADDR DPSW_CMD_ID(0x0A9)

#define DPSW_CMDID_CTRL_IF_GET_ATTR DPSW_CMD_ID(0x0A0)
+#define DPSW_CMDID_CTRL_IF_SET_POOLS DPSW_CMD_ID(0x0A1)

/* Macros for accessing command fields smaller than 1byte */
#define DPSW_MASK(field) \
@@ -377,6 +380,15 @@ struct dpsw_rsp_ctrl_if_get_attr {
__le32 tx_err_conf_fqid;
};

+#define DPSW_BACKUP_POOL(val, order) (((val) & 0x1) << (order))
+struct dpsw_cmd_ctrl_if_set_pools {
+ u8 num_dpbp;
+ u8 backup_pool_mask;
+ __le16 pad;
+ __le32 dpbp_id[DPSW_MAX_DPBP];
+ __le16 buffer_size[DPSW_MAX_DPBP];
+};
+
struct dpsw_rsp_get_api_version {
__le16 version_major;
__le16 version_minor;
diff --git a/drivers/staging/fsl-dpaa2/ethsw/dpsw.c b/drivers/staging/fsl-dpaa2/ethsw/dpsw.c
index 996f13abfb1b..01ebdb12adec 100644
--- a/drivers/staging/fsl-dpaa2/ethsw/dpsw.c
+++ b/drivers/staging/fsl-dpaa2/ethsw/dpsw.c
@@ -1213,6 +1213,37 @@ int dpsw_ctrl_if_get_attributes(struct fsl_mc_io *mc_io, u32 cmd_flags,
return 0;
}

+/**
+ * dpsw_ctrl_if_set_pools() - Set control interface buffer pools
+ * @mc_io: Pointer to MC portal's I/O object
+ * @cmd_flags: Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token: Token of DPSW object
+ * @cfg: Buffer pools configuration
+ *
+ * Return: '0' on Success; Error code otherwise.
+ */
+int dpsw_ctrl_if_set_pools(struct fsl_mc_io *mc_io, u32 cmd_flags, u16 token,
+ const struct dpsw_ctrl_if_pools_cfg *cfg)
+{
+ struct dpsw_cmd_ctrl_if_set_pools *cmd_params;
+ struct fsl_mc_command cmd = { 0 };
+ int i;
+
+ cmd.header = mc_encode_cmd_header(DPSW_CMDID_CTRL_IF_SET_POOLS,
+ cmd_flags, token);
+ cmd_params = (struct dpsw_cmd_ctrl_if_set_pools *)cmd.params;
+ cmd_params->num_dpbp = cfg->num_dpbp;
+ for (i = 0; i < DPSW_MAX_DPBP; i++) {
+ cmd_params->dpbp_id[i] = cpu_to_le32(cfg->pools[i].dpbp_id);
+ cmd_params->buffer_size[i] =
+ cpu_to_le16(cfg->pools[i].buffer_size);
+ cmd_params->backup_pool_mask |=
+ DPSW_BACKUP_POOL(cfg->pools[i].backup_pool, i);
+ }
+
+ return mc_send_command(mc_io, &cmd);
+}
+
/**
* dpsw_get_api_version() - Get Data Path Switch API version
* @mc_io: Pointer to MC portal's I/O object
diff --git a/drivers/staging/fsl-dpaa2/ethsw/dpsw.h b/drivers/staging/fsl-dpaa2/ethsw/dpsw.h
index fcc07991119d..5ad7c0634992 100644
--- a/drivers/staging/fsl-dpaa2/ethsw/dpsw.h
+++ b/drivers/staging/fsl-dpaa2/ethsw/dpsw.h
@@ -196,6 +196,32 @@ enum dpsw_queue_type {
DPSW_QUEUE_RX_ERR,
};

+/**
+ * Maximum number of DPBP
+ */
+#define DPSW_MAX_DPBP 8
+
+/**
+ * struct dpsw_ctrl_if_pools_cfg - Control interface buffer pools configuration
+ * @num_dpbp: Number of DPBPs
+ * @pools: Array of buffer pools parameters; The number of valid entries
+ * must match 'num_dpbp' value
+ * @pools.dpbp_id: DPBP object ID
+ * @pools.buffer_size: Buffer size
+ * @pools.backup_pool: Backup pool
+ */
+struct dpsw_ctrl_if_pools_cfg {
+ u8 num_dpbp;
+ struct {
+ int dpbp_id;
+ u16 buffer_size;
+ int backup_pool;
+ } pools[DPSW_MAX_DPBP];
+};
+
+int dpsw_ctrl_if_set_pools(struct fsl_mc_io *mc_io, u32 cmd_flags, u16 token,
+ const struct dpsw_ctrl_if_pools_cfg *cfg);
+
/**
* enum dpsw_action - Action selection for special/control frames
* @DPSW_ACTION_DROP: Drop frame
diff --git a/drivers/staging/fsl-dpaa2/ethsw/ethsw.c b/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
index c22b9ad558c8..21d3ff6b9f55 100644
--- a/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
+++ b/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
@@ -1503,6 +1503,83 @@ static int dpaa2_switch_setup_fqs(struct ethsw_core *ethsw)
return 0;
}

+static int dpaa2_switch_setup_dpbp(struct ethsw_core *ethsw)
+{
+ struct dpsw_ctrl_if_pools_cfg dpsw_ctrl_if_pools_cfg = { 0 };
+ struct device *dev = ethsw->dev;
+ struct fsl_mc_device *dpbp_dev;
+ struct dpbp_attr dpbp_attrs;
+ int err;
+
+ err = fsl_mc_object_allocate(to_fsl_mc_device(dev), FSL_MC_POOL_DPBP,
+ &dpbp_dev);
+ if (err) {
+ if (err == -ENXIO)
+ err = -EPROBE_DEFER;
+ else
+ dev_err(dev, "DPBP device allocation failed\n");
+ return err;
+ }
+ ethsw->dpbp_dev = dpbp_dev;
+
+ err = dpbp_open(ethsw->mc_io, 0, dpbp_dev->obj_desc.id,
+ &dpbp_dev->mc_handle);
+ if (err) {
+ dev_err(dev, "dpbp_open() failed\n");
+ goto err_open;
+ }
+
+ err = dpbp_reset(ethsw->mc_io, 0, dpbp_dev->mc_handle);
+ if (err) {
+ dev_err(dev, "dpbp_reset() failed\n");
+ goto err_reset;
+ }
+
+ err = dpbp_enable(ethsw->mc_io, 0, dpbp_dev->mc_handle);
+ if (err) {
+ dev_err(dev, "dpbp_enable() failed\n");
+ goto err_enable;
+ }
+
+ err = dpbp_get_attributes(ethsw->mc_io, 0, dpbp_dev->mc_handle,
+ &dpbp_attrs);
+ if (err) {
+ dev_err(dev, "dpbp_get_attributes() failed\n");
+ goto err_get_attr;
+ }
+
+ dpsw_ctrl_if_pools_cfg.num_dpbp = 1;
+ dpsw_ctrl_if_pools_cfg.pools[0].dpbp_id = dpbp_attrs.id;
+ dpsw_ctrl_if_pools_cfg.pools[0].buffer_size = DPAA2_SWITCH_RX_BUF_SIZE;
+ dpsw_ctrl_if_pools_cfg.pools[0].backup_pool = 0;
+
+ err = dpsw_ctrl_if_set_pools(ethsw->mc_io, 0, ethsw->dpsw_handle,
+ &dpsw_ctrl_if_pools_cfg);
+ if (err) {
+ dev_err(dev, "dpsw_ctrl_if_set_pools() failed\n");
+ goto err_get_attr;
+ }
+ ethsw->bpid = dpbp_attrs.id;
+
+ return 0;
+
+err_get_attr:
+ dpbp_disable(ethsw->mc_io, 0, dpbp_dev->mc_handle);
+err_enable:
+err_reset:
+ dpbp_close(ethsw->mc_io, 0, dpbp_dev->mc_handle);
+err_open:
+ fsl_mc_object_free(dpbp_dev);
+ return err;
+}
+
+static void dpaa2_switch_free_dpbp(struct ethsw_core *ethsw)
+{
+ dpbp_disable(ethsw->mc_io, 0, ethsw->dpbp_dev->mc_handle);
+ dpbp_close(ethsw->mc_io, 0, ethsw->dpbp_dev->mc_handle);
+ fsl_mc_object_free(ethsw->dpbp_dev);
+}
+
static int dpaa2_switch_ctrl_if_setup(struct ethsw_core *ethsw)
{
int err;
@@ -1512,6 +1589,11 @@ static int dpaa2_switch_ctrl_if_setup(struct ethsw_core *ethsw)
if (err)
return err;

+ /* setup the buffer poll needed on the Rx path */
+ err = dpaa2_switch_setup_dpbp(ethsw);
+ if (err)
+ return err;
+
return 0;
}

@@ -1693,6 +1775,11 @@ static void dpaa2_switch_takedown(struct fsl_mc_device *sw_dev)
dev_warn(dev, "dpsw_close err %d\n", err);
}

+static void dpaa2_switch_ctrl_if_teardown(struct ethsw_core *ethsw)
+{
+ dpaa2_switch_free_dpbp(ethsw);
+}
+
static int dpaa2_switch_remove(struct fsl_mc_device *sw_dev)
{
struct ethsw_port_priv *port_priv;
@@ -1703,6 +1790,9 @@ static int dpaa2_switch_remove(struct fsl_mc_device *sw_dev)
dev = &sw_dev->dev;
ethsw = dev_get_drvdata(dev);

+ if (dpaa2_switch_has_ctrl_if(ethsw))
+ dpaa2_switch_ctrl_if_teardown(ethsw);
+
dpaa2_switch_teardown_irqs(sw_dev);

dpsw_disable(ethsw->mc_io, 0, ethsw->dpsw_handle);
diff --git a/drivers/staging/fsl-dpaa2/ethsw/ethsw.h b/drivers/staging/fsl-dpaa2/ethsw/ethsw.h
index 3189dd72a51b..84130134aa67 100644
--- a/drivers/staging/fsl-dpaa2/ethsw/ethsw.h
+++ b/drivers/staging/fsl-dpaa2/ethsw/ethsw.h
@@ -17,6 +17,7 @@
#include <uapi/linux/if_bridge.h>
#include <net/switchdev.h>
#include <linux/if_bridge.h>
+#include <linux/fsl/mc.h>

#include "dpsw.h"

@@ -42,6 +43,13 @@
/* Number of receive queues (one RX and one TX_CONF) */
#define DPAA2_SWITCH_RX_NUM_FQS 2

+/* Hardware requires alignment for ingress/egress buffer addresses */
+#define DPAA2_SWITCH_RX_BUF_RAW_SIZE PAGE_SIZE
+#define DPAA2_SWITCH_RX_BUF_TAILROOM \
+ SKB_DATA_ALIGN(sizeof(struct skb_shared_info))
+#define DPAA2_SWITCH_RX_BUF_SIZE \
+ (DPAA2_SWITCH_RX_BUF_RAW_SIZE - DPAA2_SWITCH_RX_BUF_TAILROOM)
+
extern const struct ethtool_ops dpaa2_switch_port_ethtool_ops;

struct ethsw_core;
@@ -86,6 +94,8 @@ struct ethsw_core {
struct workqueue_struct *workqueue;

struct dpaa2_switch_fq fq[DPAA2_SWITCH_RX_NUM_FQS];
+ struct fsl_mc_device *dpbp_dev;
+ u16 bpid;
};

static inline bool dpaa2_switch_has_ctrl_if(struct ethsw_core *ethsw)
--
2.28.0