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Date: Fri, 16 Jun 2017 00:42:51 +0300
From: Saeed Mahameed <saeedm@...lanox.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: netdev@...r.kernel.org, Majd Dibbiny <majd@...lanox.com>,
Maor Gottlieb <maorg@...lanox.com>,
Saeed Mahameed <saeedm@...lanox.com>
Subject: [net-next 14/15] net/mlx5: Expose command polling interface
From: Majd Dibbiny <majd@...lanox.com>
Add a new interface for commands execution that allows the
caller to wait for the command's completion in a busy-wait
loop (polling mode).
This is useful if we want to execute a command in a polling mode
while the driver is working in events mode for the rest of
the commands.
This interface will be used in the downstream patches.
Signed-off-by: Majd Dibbiny <majd@...lanox.com>
Signed-off-by: Maor Gottlieb <maorg@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
drivers/net/ethernet/mellanox/mlx5/core/cmd.c | 30 ++++++++++++++++++++-------
include/linux/mlx5/driver.h | 3 +++
2 files changed, 26 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
index c1d8b0bcde75..4d5bd01f1ebb 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
@@ -785,6 +785,8 @@ static void cmd_work_handler(struct work_struct *work)
struct mlx5_cmd_layout *lay;
struct semaphore *sem;
unsigned long flags;
+ bool poll_cmd = ent->polling;
+
sem = ent->page_queue ? &cmd->pages_sem : &cmd->sem;
down(sem);
@@ -845,7 +847,7 @@ static void cmd_work_handler(struct work_struct *work)
iowrite32be(1 << ent->idx, &dev->iseg->cmd_dbell);
mmiowb();
/* if not in polling don't use ent after this point */
- if (cmd->mode == CMD_MODE_POLLING) {
+ if (cmd->mode == CMD_MODE_POLLING || poll_cmd) {
poll_timeout(ent);
/* make sure we read the descriptor after ownership is SW */
rmb();
@@ -889,7 +891,7 @@ static int wait_func(struct mlx5_core_dev *dev, struct mlx5_cmd_work_ent *ent)
struct mlx5_cmd *cmd = &dev->cmd;
int err;
- if (cmd->mode == CMD_MODE_POLLING) {
+ if (cmd->mode == CMD_MODE_POLLING || ent->polling) {
wait_for_completion(&ent->done);
} else if (!wait_for_completion_timeout(&ent->done, timeout)) {
ent->ret = -ETIMEDOUT;
@@ -917,7 +919,7 @@ static int mlx5_cmd_invoke(struct mlx5_core_dev *dev, struct mlx5_cmd_msg *in,
struct mlx5_cmd_msg *out, void *uout, int uout_size,
mlx5_cmd_cbk_t callback,
void *context, int page_queue, u8 *status,
- u8 token)
+ u8 token, bool force_polling)
{
struct mlx5_cmd *cmd = &dev->cmd;
struct mlx5_cmd_work_ent *ent;
@@ -935,6 +937,7 @@ static int mlx5_cmd_invoke(struct mlx5_core_dev *dev, struct mlx5_cmd_msg *in,
return PTR_ERR(ent);
ent->token = token;
+ ent->polling = force_polling;
if (!callback)
init_completion(&ent->done);
@@ -1535,7 +1538,8 @@ static int is_manage_pages(void *in)
}
static int cmd_exec(struct mlx5_core_dev *dev, void *in, int in_size, void *out,
- int out_size, mlx5_cmd_cbk_t callback, void *context)
+ int out_size, mlx5_cmd_cbk_t callback, void *context,
+ bool force_polling)
{
struct mlx5_cmd_msg *inb;
struct mlx5_cmd_msg *outb;
@@ -1580,7 +1584,7 @@ static int cmd_exec(struct mlx5_core_dev *dev, void *in, int in_size, void *out,
}
err = mlx5_cmd_invoke(dev, inb, outb, out, out_size, callback, context,
- pages_queue, &status, token);
+ pages_queue, &status, token, force_polling);
if (err)
goto out_out;
@@ -1608,7 +1612,7 @@ int mlx5_cmd_exec(struct mlx5_core_dev *dev, void *in, int in_size, void *out,
{
int err;
- err = cmd_exec(dev, in, in_size, out, out_size, NULL, NULL);
+ err = cmd_exec(dev, in, in_size, out, out_size, NULL, NULL, false);
return err ? : mlx5_cmd_check(dev, in, out);
}
EXPORT_SYMBOL(mlx5_cmd_exec);
@@ -1617,10 +1621,22 @@ int mlx5_cmd_exec_cb(struct mlx5_core_dev *dev, void *in, int in_size,
void *out, int out_size, mlx5_cmd_cbk_t callback,
void *context)
{
- return cmd_exec(dev, in, in_size, out, out_size, callback, context);
+ return cmd_exec(dev, in, in_size, out, out_size, callback, context,
+ false);
}
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;
+
+ err = cmd_exec(dev, in, in_size, out, out_size, NULL, NULL, true);
+
+ return err ? : mlx5_cmd_check(dev, in, out);
+}
+EXPORT_SYMBOL(mlx5_cmd_exec_polling);
+
static void destroy_msg_cache(struct mlx5_core_dev *dev)
{
struct cmd_msg_cache *ch;
diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index 6ea2f5734e37..bf15e87da8fa 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -817,6 +817,7 @@ struct mlx5_cmd_work_ent {
u64 ts1;
u64 ts2;
u16 op;
+ bool polling;
};
struct mlx5_pas {
@@ -915,6 +916,8 @@ int mlx5_cmd_exec(struct mlx5_core_dev *dev, void *in, int in_size, void *out,
int mlx5_cmd_exec_cb(struct mlx5_core_dev *dev, void *in, int in_size,
void *out, int out_size, mlx5_cmd_cbk_t callback,
void *context);
+int mlx5_cmd_exec_polling(struct mlx5_core_dev *dev, void *in, int in_size,
+ void *out, int out_size);
void mlx5_cmd_mbox_status(void *out, u8 *status, u32 *syndrome);
int mlx5_core_get_caps(struct mlx5_core_dev *dev, enum mlx5_cap_type cap_type);
--
2.11.0
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