diff options
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx5/core/lib/port_tun.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/lib/port_tun.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/port_tun.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/port_tun.c new file mode 100644 index 000000000000..40f4a19b1ce1 --- /dev/null +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/port_tun.c @@ -0,0 +1,205 @@ +/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */ +/* Copyright (c) 2019 Mellanox Technologies. */ + +#include <linux/module.h> +#include <linux/mlx5/driver.h> +#include <linux/mlx5/port.h> +#include <linux/mlx5/cmd.h> +#include "mlx5_core.h" +#include "lib/port_tun.h" + +struct mlx5_port_tun_entropy_flags { + bool force_supported, force_enabled; + bool calc_supported, calc_enabled; + bool gre_calc_supported, gre_calc_enabled; +}; + +static void mlx5_query_port_tun_entropy(struct mlx5_core_dev *mdev, + struct mlx5_port_tun_entropy_flags *entropy_flags) +{ + u32 out[MLX5_ST_SZ_DW(pcmr_reg)]; + /* Default values for FW which do not support MLX5_REG_PCMR */ + entropy_flags->force_supported = false; + entropy_flags->calc_supported = false; + entropy_flags->gre_calc_supported = false; + entropy_flags->force_enabled = false; + entropy_flags->calc_enabled = true; + entropy_flags->gre_calc_enabled = true; + + if (!MLX5_CAP_GEN(mdev, ports_check)) + return; + + if (mlx5_query_ports_check(mdev, out, sizeof(out))) + return; + + entropy_flags->force_supported = !!(MLX5_GET(pcmr_reg, out, entropy_force_cap)); + entropy_flags->calc_supported = !!(MLX5_GET(pcmr_reg, out, entropy_calc_cap)); + entropy_flags->gre_calc_supported = !!(MLX5_GET(pcmr_reg, out, entropy_gre_calc_cap)); + entropy_flags->force_enabled = !!(MLX5_GET(pcmr_reg, out, entropy_force)); + entropy_flags->calc_enabled = !!(MLX5_GET(pcmr_reg, out, entropy_calc)); + entropy_flags->gre_calc_enabled = !!(MLX5_GET(pcmr_reg, out, entropy_gre_calc)); +} + +static int mlx5_set_port_tun_entropy_calc(struct mlx5_core_dev *mdev, u8 enable, + u8 force) +{ + u32 in[MLX5_ST_SZ_DW(pcmr_reg)] = {0}; + int err; + + err = mlx5_query_ports_check(mdev, in, sizeof(in)); + if (err) + return err; + MLX5_SET(pcmr_reg, in, local_port, 1); + MLX5_SET(pcmr_reg, in, entropy_force, force); + MLX5_SET(pcmr_reg, in, entropy_calc, enable); + return mlx5_set_ports_check(mdev, in, sizeof(in)); +} + +static int mlx5_set_port_gre_tun_entropy_calc(struct mlx5_core_dev *mdev, + u8 enable, u8 force) +{ + u32 in[MLX5_ST_SZ_DW(pcmr_reg)] = {0}; + int err; + + err = mlx5_query_ports_check(mdev, in, sizeof(in)); + if (err) + return err; + MLX5_SET(pcmr_reg, in, local_port, 1); + MLX5_SET(pcmr_reg, in, entropy_force, force); + MLX5_SET(pcmr_reg, in, entropy_gre_calc, enable); + return mlx5_set_ports_check(mdev, in, sizeof(in)); +} + +void mlx5_init_port_tun_entropy(struct mlx5_tun_entropy *tun_entropy, + struct mlx5_core_dev *mdev) +{ + struct mlx5_port_tun_entropy_flags entropy_flags; + + tun_entropy->mdev = mdev; + mutex_init(&tun_entropy->lock); + mlx5_query_port_tun_entropy(mdev, &entropy_flags); + tun_entropy->num_enabling_entries = 0; + tun_entropy->num_disabling_entries = 0; + tun_entropy->enabled = entropy_flags.calc_enabled; + tun_entropy->enabled = + (entropy_flags.calc_supported) ? + entropy_flags.calc_enabled : true; +} + +static int mlx5_set_entropy(struct mlx5_tun_entropy *tun_entropy, + int reformat_type, bool enable) +{ + struct mlx5_port_tun_entropy_flags entropy_flags; + int err; + + mlx5_query_port_tun_entropy(tun_entropy->mdev, &entropy_flags); + /* Tunnel entropy calculation may be controlled either on port basis + * for all tunneling protocols or specifically for GRE protocol. + * Prioritize GRE protocol control (if capable) over global port + * configuration. + */ + if (entropy_flags.gre_calc_supported && + reformat_type == MLX5_REFORMAT_TYPE_L2_TO_NVGRE) { + /* Other applications may change the global FW entropy + * calculations settings. Check that the current entropy value + * is the negative of the updated value. + */ + if (entropy_flags.force_enabled && + enable == entropy_flags.gre_calc_enabled) { + mlx5_core_warn(tun_entropy->mdev, + "Unexpected GRE entropy calc setting - expected %d", + !entropy_flags.gre_calc_enabled); + return -EOPNOTSUPP; + } + err = mlx5_set_port_gre_tun_entropy_calc(tun_entropy->mdev, enable, + entropy_flags.force_supported); + if (err) + return err; + /* if we turn on the entropy we don't need to force it anymore */ + if (entropy_flags.force_supported && enable) { + err = mlx5_set_port_gre_tun_entropy_calc(tun_entropy->mdev, 1, 0); + if (err) + return err; + } + } else if (entropy_flags.calc_supported) { + /* Other applications may change the global FW entropy + * calculations settings. Check that the current entropy value + * is the negative of the updated value. + */ + if (entropy_flags.force_enabled && + enable == entropy_flags.calc_enabled) { + mlx5_core_warn(tun_entropy->mdev, + "Unexpected entropy calc setting - expected %d", + !entropy_flags.calc_enabled); + return -EOPNOTSUPP; + } + /* GRE requires disabling entropy calculation. if there are + * enabling entries (i.e VXLAN) we cannot turn it off for them, + * thus fail. + */ + if (tun_entropy->num_enabling_entries) + return -EOPNOTSUPP; + err = mlx5_set_port_tun_entropy_calc(tun_entropy->mdev, enable, + entropy_flags.force_supported); + if (err) + return err; + tun_entropy->enabled = enable; + /* if we turn on the entropy we don't need to force it anymore */ + if (entropy_flags.force_supported && enable) { + err = mlx5_set_port_tun_entropy_calc(tun_entropy->mdev, 1, 0); + if (err) + return err; + } + } + + return 0; +} + +/* the function manages the refcount for enabling/disabling tunnel types. + * the return value indicates if the inc is successful or not, depending on + * entropy capabilities and configuration. + */ +int mlx5_tun_entropy_refcount_inc(struct mlx5_tun_entropy *tun_entropy, + int reformat_type) +{ + /* the default is error for unknown (non VXLAN/GRE tunnel types) */ + int err = -EOPNOTSUPP; + + mutex_lock(&tun_entropy->lock); + if (reformat_type == MLX5_REFORMAT_TYPE_L2_TO_VXLAN && + tun_entropy->enabled) { + /* in case entropy calculation is enabled for all tunneling + * types, it is ok for VXLAN, so approve. + * otherwise keep the error default. + */ + tun_entropy->num_enabling_entries++; + err = 0; + } else if (reformat_type == MLX5_REFORMAT_TYPE_L2_TO_NVGRE) { + /* turn off the entropy only for the first GRE rule. + * for the next rules the entropy was already disabled + * successfully. + */ + if (tun_entropy->num_disabling_entries == 0) + err = mlx5_set_entropy(tun_entropy, reformat_type, 0); + else + err = 0; + if (!err) + tun_entropy->num_disabling_entries++; + } + mutex_unlock(&tun_entropy->lock); + + return err; +} + +void mlx5_tun_entropy_refcount_dec(struct mlx5_tun_entropy *tun_entropy, + int reformat_type) +{ + mutex_lock(&tun_entropy->lock); + if (reformat_type == MLX5_REFORMAT_TYPE_L2_TO_VXLAN) + tun_entropy->num_enabling_entries--; + else if (reformat_type == MLX5_REFORMAT_TYPE_L2_TO_NVGRE && + --tun_entropy->num_disabling_entries == 0) + mlx5_set_entropy(tun_entropy, reformat_type, 1); + mutex_unlock(&tun_entropy->lock); +} + |