From: Saeed Mahameed <saeedm@mellanox.com>
Date: Tue, 31 Mar 2020 22:03:00 -0700
Subject: net/mlx5: cmdif, Refactor error handling and reporting of async
commands
Patch-mainline: v5.18-rc1
Git-commit: 0a41527608e7f3da61e76564f5a8749a1fddc7f1
References: jsc#PED-1549
Same as the new mlx5_cmd_do API, report all information to callers and
let them handle the error values and outbox parsing.
The user callback status "work->user_callback(status)" is now similar to
the error rc code returned from the blocking mlx5_cmd_do() version,
and now is defined as follows:
-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 couldn't execute, FW or driver induced error.
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/infiniband/hw/mlx5/mr.c | 15 +++++-
drivers/net/ethernet/mellanox/mlx5/core/cmd.c | 61 +++++++++++++++-----------
include/linux/mlx5/driver.h | 3 -
3 files changed, 52 insertions(+), 27 deletions(-)
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -140,6 +140,19 @@ static int destroy_mkey(struct mlx5_ib_d
return mlx5_core_destroy_mkey(dev->mdev, mr->mmkey.key);
}
+static void create_mkey_warn(struct mlx5_ib_dev *dev, int status, void *out)
+{
+ if (status == -ENXIO) /* core driver is not available */
+ return;
+
+ mlx5_ib_warn(dev, "async reg mr failed. status %d\n", status);
+ if (status != -EREMOTEIO) /* driver specific failure */
+ return;
+
+ /* Failed in FW, print cmd out failure details */
+ mlx5_cmd_out_err(dev->mdev, MLX5_CMD_OP_CREATE_MKEY, 0, out);
+}
+
static void create_mkey_callback(int status, struct mlx5_async_work *context)
{
struct mlx5_ib_mr *mr =
@@ -149,7 +162,7 @@ static void create_mkey_callback(int sta
unsigned long flags;
if (status) {
- mlx5_ib_warn(dev, "async reg mr failed. status %d\n", status);
+ create_mkey_warn(dev, status, mr->out);
kfree(mr);
spin_lock_irqsave(&ent->lock, flags);
ent->pending--;
--- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
@@ -771,6 +771,18 @@ struct mlx5_ifc_mbox_in_bits {
u8 reserved_at_40[0x40];
};
+void mlx5_cmd_out_err(struct mlx5_core_dev *dev, u16 opcode, u16 op_mod, void *out)
+{
+ u32 syndrome = MLX5_GET(mbox_out, out, syndrome);
+ u8 status = MLX5_GET(mbox_out, out, status);
+
+ mlx5_core_err_rl(dev,
+ "%s(0x%x) op_mod(0x%x) failed, status %s(0x%x), syndrome (0x%x), err(%d)\n",
+ mlx5_command_str(opcode), opcode, op_mod,
+ cmd_status_str(status), status, syndrome, cmd_status_to_err(status));
+}
+EXPORT_SYMBOL(mlx5_cmd_out_err);
+
static void cmd_status_print(struct mlx5_core_dev *dev, void *in, void *out)
{
u16 opcode, op_mod;
@@ -789,10 +801,7 @@ static void cmd_status_print(struct mlx5
err = cmd_status_to_err(status);
if (!uid && opcode != MLX5_CMD_OP_DESTROY_MKEY)
- mlx5_core_err_rl(dev,
- "%s(0x%x) op_mod(0x%x) failed, status %s(0x%x), syndrome (0x%x), err(%d)\n",
- mlx5_command_str(opcode), opcode, op_mod,
- cmd_status_str(status), status, syndrome, err);
+ mlx5_cmd_out_err(dev, opcode, op_mod, out);
else
mlx5_core_dbg(dev,
"%s(0x%x) op_mod(0x%x) uid(%d) failed, status %s(0x%x), syndrome (0x%x), err(%d)\n",
@@ -1697,20 +1706,18 @@ static void mlx5_cmd_comp_handler(struct
callback = ent->callback;
context = ent->context;
- err = ent->ret;
- if (!err && !ent->status) {
+ err = ent->ret ? : ent->status;
+ if (err > 0) /* Failed in FW, command didn't execute */
+ err = deliv_status_to_err(err);
+
+ if (!err)
err = mlx5_copy_from_msg(ent->uout,
ent->out,
ent->uout_size);
- err = mlx5_cmd_check(dev, err, ent->in->first.data,
- ent->uout);
- }
-
mlx5_free_cmd_msg(dev, ent->out);
free_msg(dev, ent->in);
- err = err ? err : ent->status;
/* final consumer is done, release ent */
cmd_ent_put(ent);
callback(err, context);
@@ -1881,6 +1888,18 @@ out_in:
return err;
}
+/* preserve -EREMOTEIO for outbox.status != OK, otherwise return err as is */
+static int cmd_status_err(int err, void *out)
+{
+ 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;
+}
+
/**
* mlx5_cmd_do - Executes a fw command, wait for completion.
* Unlike mlx5_cmd_exec, this function will not translate or intercept
@@ -1903,13 +1922,7 @@ int mlx5_cmd_do(struct mlx5_core_dev *de
{
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;
+ return cmd_status_err(err, out);
}
EXPORT_SYMBOL(mlx5_cmd_do);
@@ -1953,12 +1966,7 @@ int mlx5_cmd_exec_polling(struct mlx5_co
{
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;
-
+ err = cmd_status_err(err, out);
return mlx5_cmd_check(dev, err, in, out);
}
EXPORT_SYMBOL(mlx5_cmd_exec_polling);
@@ -1991,8 +1999,10 @@ EXPORT_SYMBOL(mlx5_cmd_cleanup_async_ctx
static void mlx5_cmd_exec_cb_handler(int status, void *_work)
{
struct mlx5_async_work *work = _work;
- struct mlx5_async_ctx *ctx = work->ctx;
+ struct mlx5_async_ctx *ctx;
+ ctx = work->ctx;
+ status = cmd_status_err(status, work->out);
work->user_callback(status, work);
if (atomic_dec_and_test(&ctx->num_inflight))
wake_up(&ctx->wait);
@@ -2006,6 +2016,7 @@ int mlx5_cmd_exec_cb(struct mlx5_async_c
work->ctx = ctx;
work->user_callback = callback;
+ work->out = out;
if (WARN_ON(!atomic_inc_not_zero(&ctx->num_inflight)))
return -EIO;
ret = cmd_exec(ctx->dev, in, in_size, out, out_size,
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -955,6 +955,7 @@ typedef void (*mlx5_async_cbk_t)(int sta
struct mlx5_async_work {
struct mlx5_async_ctx *ctx;
mlx5_async_cbk_t user_callback;
+ void *out; /* pointer to the cmd output buffer */
};
void mlx5_cmd_init_async_ctx(struct mlx5_core_dev *dev,
@@ -963,7 +964,7 @@ void mlx5_cmd_cleanup_async_ctx(struct m
int mlx5_cmd_exec_cb(struct mlx5_async_ctx *ctx, void *in, int in_size,
void *out, int out_size, mlx5_async_cbk_t callback,
struct mlx5_async_work *work);
-
+void mlx5_cmd_out_err(struct mlx5_core_dev *dev, u16 opcode, u16 op_mod, void *out);
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,