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Date: Sun, 20 Jan 2019 12:06:18 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Eran Ben Elisha <eranbe@...lanox.com>
Cc: netdev@...r.kernel.org, Jiri Pirko <jiri@...lanox.com>,
"David S. Miller" <davem@...emloft.net>,
Ariel Almog <ariela@...lanox.com>,
Aya Levin <ayal@...lanox.com>,
Moshe Shemesh <moshe@...lanox.com>
Subject: Re: [PATCH net-next v2 09/11] net/mlx5e: Add TX reporter support
Thu, Jan 17, 2019 at 10:59:18PM CET, eranbe@...lanox.com wrote:
>Add mlx5e tx reporter to devlink health reporters. This reporter will be
>responsible for diagnosing, reporting and recovering of TX errors.
>This patch declares the TX reporter operations and allocate it using the
>devlink health API. Currently, this reporter supports reporting and
>recovering from send error CQE only. In addition, it adds diagnose
>information for the open SQs.
>
>For a local SQ recover (due to driver error report), in case of SQ recover
>failure, the recover operation will be considered as a failure.
>For a full TX recover, an attempt to close and open the channels will be
>done. If this one passed successfully, it will be considered as a
>successful recover.
>
>The SQ recover from error CQE flow is not a new feature in the driver,
>this patch re-organize the functions and adapt them for the devlink
>health API. For this purpose, move code from en_main.c to a new file
>named reporter_tx.c.
>
>Signed-off-by: Eran Ben Elisha <eranbe@...lanox.com>
>Reviewed-by: Saeed Mahameed <saeedm@...lanox.com>
>---
> .../net/ethernet/mellanox/mlx5/core/Makefile | 2 +-
> drivers/net/ethernet/mellanox/mlx5/core/en.h | 18 +-
> .../ethernet/mellanox/mlx5/core/en/reporter.h | 14 +
> .../mellanox/mlx5/core/en/reporter_tx.c | 321 ++++++++++++++++++
> .../net/ethernet/mellanox/mlx5/core/en_main.c | 135 +-------
> .../net/ethernet/mellanox/mlx5/core/en_tx.c | 2 +-
> 6 files changed, 367 insertions(+), 125 deletions(-)
> create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en/reporter.h
> create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
>
>diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Makefile b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
>index 9de9abacf7f6..6bb2a860b15b 100644
>--- a/drivers/net/ethernet/mellanox/mlx5/core/Makefile
>+++ b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
>@@ -22,7 +22,7 @@ mlx5_core-y := main.o cmd.o debugfs.o fw.o eq.o uar.o pagealloc.o \
> #
> mlx5_core-$(CONFIG_MLX5_CORE_EN) += en_main.o en_common.o en_fs.o en_ethtool.o \
> en_tx.o en_rx.o en_dim.o en_txrx.o en/xdp.o en_stats.o \
>- en_selftest.o en/port.o en/monitor_stats.o
>+ en_selftest.o en/port.o en/monitor_stats.o en/reporter_tx.o
>
> #
> # Netdev extra
>diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
>index 8fa8fdd30b85..27e276c9bf84 100644
>--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
>+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
>@@ -388,10 +388,7 @@ struct mlx5e_txqsq {
> struct mlx5e_channel *channel;
> int txq_ix;
> u32 rate_limit;
>- struct mlx5e_txqsq_recover {
>- struct work_struct recover_work;
>- u64 last_recover;
>- } recover;
>+ struct work_struct recover_work;
> } ____cacheline_aligned_in_smp;
>
> struct mlx5e_dma_info {
>@@ -682,6 +679,13 @@ struct mlx5e_rss_params {
> u8 hfunc;
> };
>
>+struct mlx5e_modify_sq_param {
>+ int curr_state;
>+ int next_state;
>+ int rl_update;
>+ int rl_index;
>+};
>+
> struct mlx5e_priv {
> /* priv data path fields - start */
> struct mlx5e_txqsq *txq2sq[MLX5E_MAX_NUM_CHANNELS * MLX5E_MAX_NUM_TC];
>@@ -737,6 +741,7 @@ struct mlx5e_priv {
> #ifdef CONFIG_MLX5_EN_TLS
> struct mlx5e_tls *tls;
> #endif
>+ struct devlink_health_reporter *tx_reporter;
> };
>
> struct mlx5e_profile {
>@@ -866,6 +871,11 @@ void mlx5e_set_rq_type(struct mlx5_core_dev *mdev, struct mlx5e_params *params);
> void mlx5e_init_rq_type_params(struct mlx5_core_dev *mdev,
> struct mlx5e_params *params);
>
>+int mlx5e_modify_sq(struct mlx5_core_dev *mdev, u32 sqn,
>+ struct mlx5e_modify_sq_param *p);
>+void mlx5e_activate_txqsq(struct mlx5e_txqsq *sq);
>+void mlx5e_tx_disable_queue(struct netdev_queue *txq);
>+
> static inline bool mlx5e_tunnel_inner_ft_supported(struct mlx5_core_dev *mdev)
> {
> return (MLX5_CAP_ETH(mdev, tunnel_stateless_gre) &&
>diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter.h b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter.h
>new file mode 100644
>index 000000000000..74083e120ab3
>--- /dev/null
>+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter.h
>@@ -0,0 +1,14 @@
>+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
>+/* Copyright (c) 2018 Mellanox Technologies. */
>+
>+#ifndef __MLX5E_EN_REPORTER_H
>+#define __MLX5E_EN_REPORTER_H
>+
>+#include <linux/mlx5/driver.h>
>+#include "en.h"
>+
>+int mlx5e_tx_reporter_create(struct mlx5e_priv *priv);
>+void mlx5e_tx_reporter_destroy(struct mlx5e_priv *priv);
>+void mlx5e_tx_reporter_err_cqe(struct mlx5e_txqsq *sq);
>+
>+#endif
>diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
>new file mode 100644
>index 000000000000..9800df4909c2
>--- /dev/null
>+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
>@@ -0,0 +1,321 @@
>+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
>+/* Copyright (c) 2018 Mellanox Technologies. */
>+
>+#include <net/devlink.h>
>+#include "reporter.h"
>+#include "lib/eq.h"
>+
>+#define MLX5E_TX_REPORTER_PER_SQ_MAX_LEN 256
Some made-up number. I don't like how this whole thing is do. I will
comment on it in the devlink part.
[...]
>+static int
>+mlx5e_tx_reporter_build_diagnose_output(struct devlink_health_buffer *buffer,
>+ u32 sqn, u8 state, u8 stopped)
>+{
>+ int err, i;
>+ int nest = 0;
>+ char name[20];
>+
>+ err = devlink_health_buffer_nest_start(buffer,
>+ DEVLINK_ATTR_HEALTH_BUFFER_OBJECT);
>+ if (err)
>+ goto buffer_error;
>+ nest++;
>+
>+ err = devlink_health_buffer_nest_start(buffer,
>+ DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_PAIR);
>+ if (err)
>+ goto buffer_error;
>+ nest++;
>+
>+ sprintf(name, "SQ 0x%x", sqn);
No. The whole idea of having the message build up with nested attributes
(json-like) was to avoid things like this. No sprintfs please. If you
want to do sprintf, most of the time you are doing something wrong.
>+ err = devlink_health_buffer_put_object_name(buffer, name);
>+ if (err)
>+ goto buffer_error;
>+
>+ err = devlink_health_buffer_nest_start(buffer,
>+ DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_VALUE);
>+ if (err)
>+ goto buffer_error;
>+ nest++;
>+
>+ err = devlink_health_buffer_nest_start(buffer,
>+ DEVLINK_ATTR_HEALTH_BUFFER_OBJECT);
>+ if (err)
>+ goto buffer_error;
>+ nest++;
>+
>+ err = devlink_health_buffer_nest_start(buffer,
>+ DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_PAIR);
>+ if (err)
>+ goto buffer_error;
>+ nest++;
>+
>+ err = devlink_health_buffer_put_object_name(buffer, "HW state");
>+ if (err)
>+ goto buffer_error;
>+
>+ err = devlink_health_buffer_nest_start(buffer,
>+ DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_VALUE);
How could you put an object name and don't start nesting? It looks
implicit to me.
>+ if (err)
>+ goto buffer_error;
>+ nest++;
>+
>+ err = devlink_health_buffer_put_value_u8(buffer, state);
>+ if (err)
>+ goto buffer_error;
>+
>+ devlink_health_buffer_nest_end(buffer); /* DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_VALUE */
>+ nest--;
>+
>+ devlink_health_buffer_nest_end(buffer); /* DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_PAIR */
>+ nest--;
>+
>+ err = devlink_health_buffer_nest_start(buffer,
>+ DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_PAIR);
>+ if (err)
>+ goto buffer_error;
>+ nest++;
>+
>+ err = devlink_health_buffer_put_object_name(buffer, "stopped");
>+ if (err)
>+ goto buffer_error;
>+
>+ err = devlink_health_buffer_nest_start(buffer,
>+ DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_VALUE);
>+ if (err)
>+ goto buffer_error;
>+ nest++;
What's up with this nest++ nest--?
When you open a nest, you should have an error path inten to close the
nest and jump there in case of an error. This is hard to read and
understand.
>+
>+ err = devlink_health_buffer_put_value_u8(buffer, stopped);
>+ if (err)
>+ goto buffer_error;
>+
>+ for (i = 0; i < nest; i++)
>+ devlink_health_buffer_nest_end(buffer);
>+
>+ return 0;
>+
>+buffer_error:
>+ for (i = 0; i < nest; i++)
>+ devlink_health_buffer_nest_cancel(buffer);
>+ return err;
>+}
>+
>+static int mlx5e_tx_reporter_diagnose(struct devlink_health_reporter *reporter,
>+ struct devlink_health_buffer **buffers_array,
>+ unsigned int buffer_size,
>+ unsigned int num_buffers)
>+{
>+ struct mlx5e_priv *priv = devlink_health_reporter_priv(reporter);
>+ unsigned int buff = 0;
>+ int i = 0, err = 0;
>+
>+ if (buffer_size < MLX5E_TX_REPORTER_PER_SQ_MAX_LEN)
>+ return -ENOMEM;
>+
>+ mutex_lock(&priv->state_lock);
>+
>+ if (!test_bit(MLX5E_STATE_OPENED, &priv->state)) {
>+ mutex_unlock(&priv->state_lock);
>+ return 0;
>+ }
>+
>+ while (i < priv->channels.num * priv->channels.params.num_tc) {
>+ struct mlx5e_txqsq *sq = priv->txq2sq[i];
>+ u8 state;
>+
>+ err = mlx5_core_query_sq_state(priv->mdev, sq->sqn, &state);
>+ if (err)
>+ break;
>+
>+ err = mlx5e_tx_reporter_build_diagnose_output(buffers_array[buff],
>+ sq->sqn, state,
>+ netif_xmit_stopped(sq->txq));
>+ if (err) {
>+ if (++buff == num_buffers)
>+ break;
>+ } else {
>+ i++;
>+ }
>+ }
>+
>+ mutex_unlock(&priv->state_lock);
>+ return err;
>+}
>+
>+static const struct devlink_health_reporter_ops mlx5_tx_reporter_ops = {
>+ .name = "TX",
>+ .recover = mlx5e_tx_reporter_recover,
>+ .diagnose_size = MLX5E_MAX_NUM_CHANNELS * MLX5E_MAX_NUM_TC *
>+ MLX5E_TX_REPORTER_PER_SQ_MAX_LEN,
>+ .diagnose = mlx5e_tx_reporter_diagnose,
>+ .dump_size = 0,
>+ .dump = NULL,
Don't initialize 0 and NULL in static const.
[...]
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