From: Saeed Mahameed <saeedm@mellanox.com>
Date: Sat, 17 Aug 2019 03:05:10 -0700
Subject: net/mlx5: cmdif, Add new api for command execution
Patch-mainline: v5.18-rc1
Git-commit: f23519e542e51c19ab3081deb089bb3f8fec7bb9
References: jsc#PED-1549
Add mlx5_cmd_do. Unlike mlx5_cmd_exec, this function will not modify
or translate outbox.status.
The function will return:
return = 0: Command was executed, outbox.status == MLX5_CMD_STAT_OK.
return = -EREMOTEIO: Executed, outbox.status != MLX5_CMD_STAT_OK.
return < 0: Command execution couldn't be performed by FW or driver.
And document other mlx5_cmd_exec functions.
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/mellanox/mlx5/core/cmd.c | 79 +++++++++++++++++++++-----
include/linux/mlx5/driver.h | 2
2 files changed, 68 insertions(+), 13 deletions(-)
--- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
@@ -800,7 +800,7 @@ static void cmd_status_print(struct mlx5
cmd_status_str(status), status, syndrome, err);
}
-static int mlx5_cmd_check(struct mlx5_core_dev *dev, int err, void *in, void *out)
+int mlx5_cmd_check(struct mlx5_core_dev *dev, int err, void *in, void *out)
{
/* aborted due to PCI error or via reset flow mlx5_cmd_trigger_completions() */
if (err == -ENXIO) {
@@ -817,7 +817,7 @@ static int mlx5_cmd_check(struct mlx5_co
}
/* driver or FW delivery error */
- if (err)
+ if (err != -EREMOTEIO && err)
return err;
/* check outbox status */
@@ -827,6 +827,7 @@ static int mlx5_cmd_check(struct mlx5_co
return err;
}
+EXPORT_SYMBOL(mlx5_cmd_check);
static void dump_command(struct mlx5_core_dev *dev,
struct mlx5_cmd_work_ent *ent, int input)
@@ -1881,6 +1882,38 @@ out_in:
}
/**
+ * mlx5_cmd_do - Executes a fw command, wait for completion.
+ * Unlike mlx5_cmd_exec, this function will not translate or intercept
+ * outbox.status and will return -EREMOTEIO when
+ * outbox.status != MLX5_CMD_STAT_OK
+ *
+ * @dev: mlx5 core device
+ * @in: inbox mlx5_ifc command buffer
+ * @in_size: inbox buffer size
+ * @out: outbox mlx5_ifc buffer
+ * @out_size: outbox size
+ *
+ * @return:
+ * -EREMOTEIO : Command executed by FW, outbox.status != MLX5_CMD_STAT_OK.
+ * Caller must check FW outbox status.
+ * 0 : Command execution successful, outbox.status == MLX5_CMD_STAT_OK.
+ * < 0 : Command execution couldn't be performed by firmware or driver
+ */
+int mlx5_cmd_do(struct mlx5_core_dev *dev, void *in, int in_size, void *out, int out_size)
+{
+ int err = cmd_exec(dev, in, in_size, out, out_size, NULL, NULL, false);
+
+ if (err) /* -EREMOTEIO is preserved */
+ return err == -EREMOTEIO ? -EIO : err;
+
+ if (MLX5_GET(mbox_out, out, status) != MLX5_CMD_STAT_OK)
+ return -EREMOTEIO;
+
+ return 0;
+}
+EXPORT_SYMBOL(mlx5_cmd_do);
+
+/**
* mlx5_cmd_exec - Executes a fw command, wait for completion
*
* @dev: mlx5 core device
@@ -1889,18 +1922,47 @@ out_in:
* @out: outbox mlx5_ifc buffer
* @out_size: outbox size
*
- * @return: 0 if no error, FW command execution was successful,
+ * @return: 0 if no error, FW command execution was successful
* and outbox status is ok.
*/
int mlx5_cmd_exec(struct mlx5_core_dev *dev, void *in, int in_size, void *out,
int out_size)
{
- int err = cmd_exec(dev, in, in_size, out, out_size, NULL, NULL, false);
+ int err = mlx5_cmd_do(dev, in, in_size, out, out_size);
return mlx5_cmd_check(dev, err, in, out);
}
EXPORT_SYMBOL(mlx5_cmd_exec);
+/**
+ * mlx5_cmd_exec_polling - Executes a fw command, poll for completion
+ * Needed for driver force teardown, when command completion EQ
+ * will not be available to complete the command
+ *
+ * @dev: mlx5 core device
+ * @in: inbox mlx5_ifc command buffer
+ * @in_size: inbox buffer size
+ * @out: outbox mlx5_ifc buffer
+ * @out_size: outbox size
+ *
+ * @return: 0 if no error, FW command execution was successful
+ * and outbox status is ok.
+ */
+int mlx5_cmd_exec_polling(struct mlx5_core_dev *dev, void *in, int in_size,
+ void *out, int out_size)
+{
+ int err = cmd_exec(dev, in, in_size, out, out_size, NULL, NULL, true);
+
+ if (err) /* -EREMOTEIO is preserved */
+ return err == -EREMOTEIO ? -EIO : err;
+
+ if (MLX5_GET(mbox_out, out, status) != MLX5_CMD_STAT_OK)
+ err = -EREMOTEIO;
+
+ return mlx5_cmd_check(dev, err, in, out);
+}
+EXPORT_SYMBOL(mlx5_cmd_exec_polling);
+
void mlx5_cmd_init_async_ctx(struct mlx5_core_dev *dev,
struct mlx5_async_ctx *ctx)
{
@@ -1955,15 +2017,6 @@ int mlx5_cmd_exec_cb(struct mlx5_async_c
}
EXPORT_SYMBOL(mlx5_cmd_exec_cb);
-int mlx5_cmd_exec_polling(struct mlx5_core_dev *dev, void *in, int in_size,
- void *out, int out_size)
-{
- int err = cmd_exec(dev, in, in_size, out, out_size, NULL, NULL, true);
-
- return mlx5_cmd_check(dev, err, in, out);
-}
-EXPORT_SYMBOL(mlx5_cmd_exec_polling);
-
static void destroy_msg_cache(struct mlx5_core_dev *dev)
{
struct cmd_msg_cache *ch;
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -964,6 +964,8 @@ int mlx5_cmd_exec_cb(struct mlx5_async_c
void *out, int out_size, mlx5_async_cbk_t callback,
struct mlx5_async_work *work);
+int mlx5_cmd_do(struct mlx5_core_dev *dev, void *in, int in_size, void *out, int out_size);
+int mlx5_cmd_check(struct mlx5_core_dev *dev, int err, void *in, void *out);
int mlx5_cmd_exec(struct mlx5_core_dev *dev, void *in, int in_size, void *out,
int out_size);