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Subject[PATCH net-next RFC v2 repost 3/3] net/mlx5e: Add devlink
Date
From: Aya Levin <ayal@mellanox.com>

Register MTU error trap to allow visibility of oversize packets. Display
a naive use of devlink trap in devlink port context.

Signed-off-by: Aya Levin <ayal@mellanox.com>
---
Changelog:
v1->v2:
-Minor changes in trap's definition
-Adjustments to trap API and ops

drivers/net/ethernet/mellanox/mlx5/core/Makefile | 2 +-
drivers/net/ethernet/mellanox/mlx5/core/en.h | 2 +
drivers/net/ethernet/mellanox/mlx5/core/en/traps.c | 38 +++++++++++++++++
drivers/net/ethernet/mellanox/mlx5/core/en/traps.h | 14 +++++++
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 48 ++++++++++++++++++++++
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 11 ++++-
6 files changed, 112 insertions(+), 3 deletions(-)
create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en/traps.c
create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en/traps.h

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Makefile b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
index 9826a041e407..32436325725c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/Makefile
+++ b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
@@ -25,7 +25,7 @@ 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/health.o \
en/reporter_tx.o en/reporter_rx.o en/params.o en/xsk/pool.o \
- en/xsk/setup.o en/xsk/rx.o en/xsk/tx.o en/devlink.o
+ en/xsk/setup.o en/xsk/rx.o en/xsk/tx.o en/devlink.o en/traps.o

#
# Netdev extra
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index 0df40d24acb0..6e652a513a84 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -824,6 +824,8 @@ struct mlx5e_priv {
struct mlx5e_hv_vhca_stats_agent stats_agent;
#endif
struct mlx5e_scratchpad scratchpad;
+ bool trap_oversize;
+ void *trap_mtu;
};

struct mlx5e_rx_handlers {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/traps.c b/drivers/net/ethernet/mellanox/mlx5/core/en/traps.c
new file mode 100644
index 000000000000..211407666c3a
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/traps.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2020 Mellanox Technologies.
+#include "traps.h"
+
+#define MLX5E_TRAP(_id, _type, _group_id) \
+ DEVLINK_TRAP_GENERIC(_type, DROP, _id, \
+ DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id, \
+ DEVLINK_TRAP_METADATA_TYPE_F_IN_PORT)
+static struct devlink_trap mlx5e_traps_arr[] = {
+ MLX5E_TRAP(MTU_ERROR, EXCEPTION, L2_DROPS),
+};
+
+int mlx5e_devlink_traps_create(struct mlx5e_priv *priv)
+{
+ struct devlink_port *dl_port = &priv->dl_port;
+
+ return devlink_port_traps_register(dl_port, mlx5e_traps_arr,
+ ARRAY_SIZE(mlx5e_traps_arr),
+ priv);
+}
+
+void mlx5e_devlink_traps_destroy(struct mlx5e_priv *priv)
+{
+ struct devlink_port *dl_port = &priv->dl_port;
+
+ devlink_port_traps_unregister(dl_port, mlx5e_traps_arr,
+ ARRAY_SIZE(mlx5e_traps_arr));
+}
+
+struct devlink_trap *mlx5e_trap_lookup(u16 id)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(mlx5e_traps_arr); i++)
+ if (mlx5e_traps_arr[i].id == id)
+ return &mlx5e_traps_arr[i];
+ return NULL;
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/traps.h b/drivers/net/ethernet/mellanox/mlx5/core/en/traps.h
new file mode 100644
index 000000000000..7d95cd4b571c
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/traps.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2020 Mellanox Technologies.*/
+
+#ifndef __MLX5E_EN_TRAPS_H
+#define __MLX5E_EN_TRAPS_H
+
+#include "en.h"
+
+int mlx5e_devlink_traps_create(struct mlx5e_priv *priv);
+void mlx5e_devlink_traps_destroy(struct mlx5e_priv *priv);
+struct devlink_trap *mlx5e_trap_lookup(u16 id);
+
+#endif
+
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 472252ea67a1..81d1e6186bb8 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -64,6 +64,7 @@
#include "en/hv_vhca_stats.h"
#include "en/devlink.h"
#include "lib/mlx5.h"
+#include "en/traps.h"

bool mlx5e_check_fragmented_striding_rq_cap(struct mlx5_core_dev *mdev)
{
@@ -5003,6 +5004,50 @@ void mlx5e_destroy_q_counters(struct mlx5e_priv *priv)
}
}

+static int mlx5e_devlink_trap_init(struct devlink_port *devlink_port,
+ const struct devlink_trap *trap,
+ void *trap_ctx)
+{
+ struct mlx5e_priv *priv = (struct mlx5e_priv *)devlink_trap_ctx_priv(trap_ctx);
+
+ if (!mlx5e_trap_lookup(trap->id))
+ return -EINVAL;
+ priv->trap_oversize = false;
+ priv->trap_mtu = trap_ctx;
+ return 0;
+}
+
+static void mlx5e_devlink_trap_fini(struct devlink_port *devlink_port,
+ const struct devlink_trap *trap,
+ void *trap_ctx)
+{
+ struct mlx5e_priv *priv = (struct mlx5e_priv *)devlink_trap_ctx_priv(trap_ctx);
+
+ if (!mlx5e_trap_lookup(trap->id))
+ return;
+ priv->trap_oversize = false;
+ priv->trap_mtu = NULL;
+}
+
+static int mlx5e_devlink_trap_action_set(struct devlink_port *devlink_port,
+ const struct devlink_trap *trap,
+ enum devlink_trap_action action,
+ struct netlink_ext_ack *extack)
+{
+ struct mlx5e_priv *priv = container_of(devlink_port, struct mlx5e_priv, dl_port);
+
+ if (!mlx5e_trap_lookup(trap->id))
+ return -EINVAL;
+ priv->trap_oversize = !!action;
+ return 0;
+}
+
+static const struct devlink_port_ops mlx5e_devlink_port_ops = {
+ .trap_init = mlx5e_devlink_trap_init,
+ .trap_fini = mlx5e_devlink_trap_fini,
+ .trap_action_set = mlx5e_devlink_trap_action_set,
+};
+
static int mlx5e_nic_init(struct mlx5_core_dev *mdev,
struct net_device *netdev,
const struct mlx5e_profile *profile,
@@ -5032,12 +5077,15 @@ static int mlx5e_nic_init(struct mlx5_core_dev *mdev,
if (err)
mlx5_core_err(mdev, "mlx5e_devlink_port_register failed, %d\n", err);
mlx5e_health_create_reporters(priv);
+ devlink_port_set_ops(&priv->dl_port, &mlx5e_devlink_port_ops);
+ mlx5e_devlink_traps_create(priv);

return 0;
}

static void mlx5e_nic_cleanup(struct mlx5e_priv *priv)
{
+ mlx5e_devlink_traps_destroy(priv);
mlx5e_health_destroy_reporters(priv);
mlx5e_devlink_port_unregister(priv);
mlx5e_tls_cleanup(priv);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index 85d545bb47be..ec2fd39a57d5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -1445,6 +1445,7 @@ mlx5e_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi,
u16 cqe_bcnt, u32 head_offset, u32 page_idx)
{
struct mlx5e_dma_info *di = &wi->umr.dma_info[page_idx];
+ struct mlx5e_priv *priv = rq->channel->priv;
u16 rx_headroom = rq->buff.headroom;
u32 cqe_bcnt32 = cqe_bcnt;
struct xdp_buff xdp;
@@ -1452,11 +1453,14 @@ mlx5e_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi,
void *va, *data;
u32 frag_size;
bool consumed;
+ bool trap;

/* Check packet size. Note LRO doesn't use linear SKB */
if (unlikely(cqe_bcnt > rq->hw_mtu)) {
rq->stats->oversize_pkts_sw_drop++;
- return NULL;
+ if (!priv->trap_oversize)
+ return NULL;
+ trap = true;
}

va = page_address(di->page) + head_offset;
@@ -1483,7 +1487,10 @@ mlx5e_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi,
skb = mlx5e_build_linear_skb(rq, va, frag_size, rx_headroom, cqe_bcnt32);
if (unlikely(!skb))
return NULL;
-
+ if (trap) {
+ devlink_port_trap_report(&priv->dl_port, skb, priv->trap_mtu, NULL);
+ return NULL;
+ }
/* queue up for recycling/reuse */
page_ref_inc(di->page);

--
2.14.1
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