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Miller" , Jakub Kicinski , Jiri Pirko , netdev@vger.kernel.org Cc: Moshe Shemesh , Eran Ben Elisha , Ido Schimmel , linux-kernel@vger.kernel.org, Aya Levin Subject: [PATCH net-next RFC v1 4/4] net/mlx5e: Add devlink trap to catch oversize packets Date: Wed, 2 Sep 2020 18:32:14 +0300 Message-Id: <1599060734-26617-5-git-send-email-ayal@mellanox.com> X-Mailer: git-send-email 1.8.4.3 In-Reply-To: <1599060734-26617-1-git-send-email-ayal@mellanox.com> References: <1599060734-26617-1-git-send-email-ayal@mellanox.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org 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 --- 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 | 32 +++++++++++++++++ drivers/net/ethernet/mellanox/mlx5/core/en/traps.h | 13 +++++++ drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 41 ++++++++++++++++++++++ drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 11 ++++-- 6 files changed, 98 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 94268a697e1c..78e2e9107986 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/umem.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 0cc2080fd847..7e5581ed9311 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en.h +++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h @@ -814,6 +814,8 @@ struct mlx5e_priv { struct mlx5e_hv_vhca_stats_agent stats_agent; #endif struct mlx5e_scratchpad scratchpad; + void *trap_mtu; + bool trap_oversize; }; 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..e365e8dbd6ff --- /dev/null +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/traps.c @@ -0,0 +1,32 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2020 Mellanox Technologies. +#include "en.h" +#include "traps.h" +#include +#include + +#define MLX5E_TRAP(_id, _group_id) \ + DEVLINK_TRAP_GENERIC(DROP, 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, 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)); +} + 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..14a32b6968ee --- /dev/null +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/traps.h @@ -0,0 +1,13 @@ +/* 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); + +#endif + diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c index aebcf73f8546..056f34326b3d 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) { @@ -4976,6 +4977,43 @@ void mlx5e_destroy_q_counters(struct mlx5e_priv *priv) } } +static int mlx5e_devlink_trap_init(struct devlink *devlink, + const struct devlink_trap *trap, + void *trap_ctx) +{ + struct mlx5e_priv *priv = (struct mlx5e_priv *)devlink_trap_ctx_priv(trap_ctx); + + priv->trap_mtu = trap_ctx; + return 0; +} + +static void mlx5e_devlink_trap_fini(struct devlink *devlink, + const struct devlink_trap *trap, + void *trap_ctx) +{ + struct mlx5e_priv *priv = (struct mlx5e_priv *)devlink_trap_ctx_priv(trap_ctx); + + priv->trap_mtu = NULL; +} + +static int mlx5e_devlink_trap_action_set(struct devlink *devlink, + const struct devlink_trap *trap, + enum devlink_trap_action action, + void *trap_ctx, + struct netlink_ext_ack *extack) +{ + struct mlx5e_priv *priv = (struct mlx5e_priv *)devlink_trap_ctx_priv(trap_ctx); + + priv->trap_oversize = !!action; + return 0; +} + +static const struct devlink_trap_ops mlx5e_devlink_traps_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, @@ -5005,12 +5043,15 @@ 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_traps_ops(&priv->dl_port, &mlx5e_devlink_traps_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 1e42e27eae26..4fe20a6e6d6d 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c @@ -1437,6 +1437,7 @@ 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; @@ -1444,11 +1445,14 @@ 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; @@ -1475,7 +1479,10 @@ 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);