diff options
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx5/core/en/params.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/en/params.c | 1240 |
1 files changed, 1240 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c new file mode 100644 index 000000000..d3de1b7a8 --- /dev/null +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c @@ -0,0 +1,1240 @@ +// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB +/* Copyright (c) 2019 Mellanox Technologies. */ + +#include "en/params.h" +#include "en/txrx.h" +#include "en/port.h" +#include "en_accel/en_accel.h" +#include "en_accel/ipsec.h" +#include <net/xdp_sock_drv.h> + +static u8 mlx5e_mpwrq_min_page_shift(struct mlx5_core_dev *mdev) +{ + u8 min_page_shift = MLX5_CAP_GEN_2(mdev, log_min_mkey_entity_size); + + return min_page_shift ? : 12; +} + +u8 mlx5e_mpwrq_page_shift(struct mlx5_core_dev *mdev, struct mlx5e_xsk_param *xsk) +{ + u8 req_page_shift = xsk ? order_base_2(xsk->chunk_size) : PAGE_SHIFT; + u8 min_page_shift = mlx5e_mpwrq_min_page_shift(mdev); + + /* Regular RQ uses order-0 pages, the NIC must be able to map them. */ + if (WARN_ON_ONCE(!xsk && req_page_shift < min_page_shift)) + min_page_shift = req_page_shift; + + return max(req_page_shift, min_page_shift); +} + +enum mlx5e_mpwrq_umr_mode +mlx5e_mpwrq_umr_mode(struct mlx5_core_dev *mdev, struct mlx5e_xsk_param *xsk) +{ + /* Different memory management schemes use different mechanisms to map + * user-mode memory. The stricter guarantees we have, the faster + * mechanisms we use: + * 1. MTT - direct mapping in page granularity. + * 2. KSM - indirect mapping to another MKey to arbitrary addresses, but + * all mappings have the same size. + * 3. KLM - indirect mapping to another MKey to arbitrary addresses, and + * mappings can have different sizes. + */ + u8 page_shift = mlx5e_mpwrq_page_shift(mdev, xsk); + bool unaligned = xsk ? xsk->unaligned : false; + bool oversized = false; + + if (xsk) { + oversized = xsk->chunk_size < (1 << page_shift); + WARN_ON_ONCE(xsk->chunk_size > (1 << page_shift)); + } + + /* XSK frame size doesn't match the UMR page size, either because the + * frame size is not a power of two, or it's smaller than the minimal + * page size supported by the firmware. + * It's possible to receive packets bigger than MTU in certain setups. + * To avoid writing over the XSK frame boundary, the top region of each + * stride is mapped to a garbage page, resulting in two mappings of + * different sizes per frame. + */ + if (oversized) { + /* An optimization for frame sizes equal to 3 * power_of_two. + * 3 KSMs point to the frame, and one KSM points to the garbage + * page, which works faster than KLM. + */ + if (xsk->chunk_size % 3 == 0 && is_power_of_2(xsk->chunk_size / 3)) + return MLX5E_MPWRQ_UMR_MODE_TRIPLE; + + return MLX5E_MPWRQ_UMR_MODE_OVERSIZED; + } + + /* XSK frames can start at arbitrary unaligned locations, but they all + * have the same size which is a power of two. It allows to optimize to + * one KSM per frame. + */ + if (unaligned) + return MLX5E_MPWRQ_UMR_MODE_UNALIGNED; + + /* XSK: frames are naturally aligned, MTT can be used. + * Non-XSK: Allocations happen in units of CPU pages, therefore, the + * mappings are naturally aligned. + */ + return MLX5E_MPWRQ_UMR_MODE_ALIGNED; +} + +u8 mlx5e_mpwrq_umr_entry_size(enum mlx5e_mpwrq_umr_mode mode) +{ + switch (mode) { + case MLX5E_MPWRQ_UMR_MODE_ALIGNED: + return sizeof(struct mlx5_mtt); + case MLX5E_MPWRQ_UMR_MODE_UNALIGNED: + return sizeof(struct mlx5_ksm); + case MLX5E_MPWRQ_UMR_MODE_OVERSIZED: + return sizeof(struct mlx5_klm) * 2; + case MLX5E_MPWRQ_UMR_MODE_TRIPLE: + return sizeof(struct mlx5_ksm) * 4; + } + WARN_ONCE(1, "MPWRQ UMR mode %d is not known\n", mode); + return 0; +} + +u8 mlx5e_mpwrq_log_wqe_sz(struct mlx5_core_dev *mdev, u8 page_shift, + enum mlx5e_mpwrq_umr_mode umr_mode) +{ + u8 umr_entry_size = mlx5e_mpwrq_umr_entry_size(umr_mode); + u8 max_pages_per_wqe, max_log_mpwqe_size; + u16 max_wqe_size; + + /* Keep in sync with MLX5_MPWRQ_MAX_PAGES_PER_WQE. */ + max_wqe_size = mlx5e_get_max_sq_aligned_wqebbs(mdev) * MLX5_SEND_WQE_BB; + max_pages_per_wqe = ALIGN_DOWN(max_wqe_size - sizeof(struct mlx5e_umr_wqe), + MLX5_UMR_MTT_ALIGNMENT) / umr_entry_size; + max_log_mpwqe_size = ilog2(max_pages_per_wqe) + page_shift; + + WARN_ON_ONCE(max_log_mpwqe_size < MLX5E_ORDER2_MAX_PACKET_MTU); + + return min_t(u8, max_log_mpwqe_size, MLX5_MPWRQ_MAX_LOG_WQE_SZ); +} + +u8 mlx5e_mpwrq_pages_per_wqe(struct mlx5_core_dev *mdev, u8 page_shift, + enum mlx5e_mpwrq_umr_mode umr_mode) +{ + u8 log_wqe_sz = mlx5e_mpwrq_log_wqe_sz(mdev, page_shift, umr_mode); + u8 pages_per_wqe; + + pages_per_wqe = log_wqe_sz > page_shift ? (1 << (log_wqe_sz - page_shift)) : 1; + + /* Two MTTs are needed to form an octword. The number of MTTs is encoded + * in octwords in a UMR WQE, so we need at least two to avoid mapping + * garbage addresses. + */ + if (WARN_ON_ONCE(pages_per_wqe < 2 && umr_mode == MLX5E_MPWRQ_UMR_MODE_ALIGNED)) + pages_per_wqe = 2; + + /* Sanity check for further calculations to succeed. */ + BUILD_BUG_ON(MLX5_MPWRQ_MAX_PAGES_PER_WQE > 64); + if (WARN_ON_ONCE(pages_per_wqe > MLX5_MPWRQ_MAX_PAGES_PER_WQE)) + return MLX5_MPWRQ_MAX_PAGES_PER_WQE; + + return pages_per_wqe; +} + +u16 mlx5e_mpwrq_umr_wqe_sz(struct mlx5_core_dev *mdev, u8 page_shift, + enum mlx5e_mpwrq_umr_mode umr_mode) +{ + u8 pages_per_wqe = mlx5e_mpwrq_pages_per_wqe(mdev, page_shift, umr_mode); + u8 umr_entry_size = mlx5e_mpwrq_umr_entry_size(umr_mode); + u16 umr_wqe_sz; + + umr_wqe_sz = sizeof(struct mlx5e_umr_wqe) + + ALIGN(pages_per_wqe * umr_entry_size, MLX5_UMR_MTT_ALIGNMENT); + + WARN_ON_ONCE(DIV_ROUND_UP(umr_wqe_sz, MLX5_SEND_WQE_DS) > MLX5_WQE_CTRL_DS_MASK); + + return umr_wqe_sz; +} + +u8 mlx5e_mpwrq_umr_wqebbs(struct mlx5_core_dev *mdev, u8 page_shift, + enum mlx5e_mpwrq_umr_mode umr_mode) +{ + return DIV_ROUND_UP(mlx5e_mpwrq_umr_wqe_sz(mdev, page_shift, umr_mode), + MLX5_SEND_WQE_BB); +} + +u8 mlx5e_mpwrq_mtts_per_wqe(struct mlx5_core_dev *mdev, u8 page_shift, + enum mlx5e_mpwrq_umr_mode umr_mode) +{ + u8 pages_per_wqe = mlx5e_mpwrq_pages_per_wqe(mdev, page_shift, umr_mode); + + /* Add another page as a buffer between WQEs. This page will absorb + * write overflow by the hardware, when receiving packets larger than + * MTU. These oversize packets are dropped by the driver at a later + * stage. + */ + return ALIGN(pages_per_wqe + 1, + MLX5_SEND_WQE_BB / mlx5e_mpwrq_umr_entry_size(umr_mode)); +} + +u32 mlx5e_mpwrq_max_num_entries(struct mlx5_core_dev *mdev, + enum mlx5e_mpwrq_umr_mode umr_mode) +{ + /* Same limits apply to KSMs and KLMs. */ + u32 klm_limit = min(MLX5E_MAX_RQ_NUM_KSMS, + 1 << MLX5_CAP_GEN(mdev, log_max_klm_list_size)); + + switch (umr_mode) { + case MLX5E_MPWRQ_UMR_MODE_ALIGNED: + return MLX5E_MAX_RQ_NUM_MTTS; + case MLX5E_MPWRQ_UMR_MODE_UNALIGNED: + return klm_limit; + case MLX5E_MPWRQ_UMR_MODE_OVERSIZED: + /* Each entry is two KLMs. */ + return klm_limit / 2; + case MLX5E_MPWRQ_UMR_MODE_TRIPLE: + /* Each entry is four KSMs. */ + return klm_limit / 4; + } + WARN_ONCE(1, "MPWRQ UMR mode %d is not known\n", umr_mode); + return 0; +} + +static u8 mlx5e_mpwrq_max_log_rq_size(struct mlx5_core_dev *mdev, u8 page_shift, + enum mlx5e_mpwrq_umr_mode umr_mode) +{ + u8 mtts_per_wqe = mlx5e_mpwrq_mtts_per_wqe(mdev, page_shift, umr_mode); + u32 max_entries = mlx5e_mpwrq_max_num_entries(mdev, umr_mode); + + return ilog2(max_entries / mtts_per_wqe); +} + +u8 mlx5e_mpwrq_max_log_rq_pkts(struct mlx5_core_dev *mdev, u8 page_shift, + enum mlx5e_mpwrq_umr_mode umr_mode) +{ + return mlx5e_mpwrq_max_log_rq_size(mdev, page_shift, umr_mode) + + mlx5e_mpwrq_log_wqe_sz(mdev, page_shift, umr_mode) - + MLX5E_ORDER2_MAX_PACKET_MTU; +} + +u16 mlx5e_get_linear_rq_headroom(struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk) +{ + u16 headroom; + + if (xsk) + return xsk->headroom; + + headroom = NET_IP_ALIGN; + if (params->xdp_prog) + headroom += XDP_PACKET_HEADROOM; + else + headroom += MLX5_RX_HEADROOM; + + return headroom; +} + +static u32 mlx5e_rx_get_linear_sz_xsk(struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk) +{ + u32 hw_mtu = MLX5E_SW2HW_MTU(params, params->sw_mtu); + + return xsk->headroom + hw_mtu; +} + +static u32 mlx5e_rx_get_linear_sz_skb(struct mlx5e_params *params, bool xsk) +{ + /* SKBs built on XDP_PASS on XSK RQs don't have headroom. */ + u16 headroom = xsk ? 0 : mlx5e_get_linear_rq_headroom(params, NULL); + u32 hw_mtu = MLX5E_SW2HW_MTU(params, params->sw_mtu); + + return MLX5_SKB_FRAG_SZ(headroom + hw_mtu); +} + +static u32 mlx5e_rx_get_linear_stride_sz(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk, + bool mpwqe) +{ + /* XSK frames are mapped as individual pages, because frames may come in + * an arbitrary order from random locations in the UMEM. + */ + if (xsk) + return mpwqe ? 1 << mlx5e_mpwrq_page_shift(mdev, xsk) : PAGE_SIZE; + + /* XDP in mlx5e doesn't support multiple packets per page. */ + if (params->xdp_prog) + return PAGE_SIZE; + + return roundup_pow_of_two(mlx5e_rx_get_linear_sz_skb(params, false)); +} + +static u8 mlx5e_mpwqe_log_pkts_per_wqe(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk) +{ + u32 linear_stride_sz = mlx5e_rx_get_linear_stride_sz(mdev, params, xsk, true); + enum mlx5e_mpwrq_umr_mode umr_mode = mlx5e_mpwrq_umr_mode(mdev, xsk); + u8 page_shift = mlx5e_mpwrq_page_shift(mdev, xsk); + + return mlx5e_mpwrq_log_wqe_sz(mdev, page_shift, umr_mode) - + order_base_2(linear_stride_sz); +} + +bool mlx5e_rx_is_linear_skb(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk) +{ + if (params->packet_merge.type != MLX5E_PACKET_MERGE_NONE) + return false; + + /* Both XSK and non-XSK cases allocate an SKB on XDP_PASS. Packet data + * must fit into a CPU page. + */ + if (mlx5e_rx_get_linear_sz_skb(params, xsk) > PAGE_SIZE) + return false; + + /* XSK frames must be big enough to hold the packet data. */ + if (xsk && mlx5e_rx_get_linear_sz_xsk(params, xsk) > xsk->chunk_size) + return false; + + return true; +} + +static bool mlx5e_verify_rx_mpwqe_strides(struct mlx5_core_dev *mdev, + u8 log_stride_sz, u8 log_num_strides, + u8 page_shift, + enum mlx5e_mpwrq_umr_mode umr_mode) +{ + if (log_stride_sz + log_num_strides != + mlx5e_mpwrq_log_wqe_sz(mdev, page_shift, umr_mode)) + return false; + + if (log_stride_sz < MLX5_MPWQE_LOG_STRIDE_SZ_BASE || + log_stride_sz > MLX5_MPWQE_LOG_STRIDE_SZ_MAX) + return false; + + if (log_num_strides > MLX5_MPWQE_LOG_NUM_STRIDES_MAX) + return false; + + if (MLX5_CAP_GEN(mdev, ext_stride_num_range)) + return log_num_strides >= MLX5_MPWQE_LOG_NUM_STRIDES_EXT_BASE; + + return log_num_strides >= MLX5_MPWQE_LOG_NUM_STRIDES_BASE; +} + +bool mlx5e_rx_mpwqe_is_linear_skb(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk) +{ + enum mlx5e_mpwrq_umr_mode umr_mode = mlx5e_mpwrq_umr_mode(mdev, xsk); + u8 page_shift = mlx5e_mpwrq_page_shift(mdev, xsk); + u8 log_num_strides; + u8 log_stride_sz; + u8 log_wqe_sz; + + if (!mlx5e_rx_is_linear_skb(mdev, params, xsk)) + return false; + + log_stride_sz = order_base_2(mlx5e_rx_get_linear_stride_sz(mdev, params, xsk, true)); + log_wqe_sz = mlx5e_mpwrq_log_wqe_sz(mdev, page_shift, umr_mode); + + if (log_wqe_sz < log_stride_sz) + return false; + + log_num_strides = log_wqe_sz - log_stride_sz; + + return mlx5e_verify_rx_mpwqe_strides(mdev, log_stride_sz, + log_num_strides, page_shift, + umr_mode); +} + +u8 mlx5e_mpwqe_get_log_rq_size(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk) +{ + enum mlx5e_mpwrq_umr_mode umr_mode = mlx5e_mpwrq_umr_mode(mdev, xsk); + u8 log_pkts_per_wqe, page_shift, max_log_rq_size; + + log_pkts_per_wqe = mlx5e_mpwqe_log_pkts_per_wqe(mdev, params, xsk); + page_shift = mlx5e_mpwrq_page_shift(mdev, xsk); + max_log_rq_size = mlx5e_mpwrq_max_log_rq_size(mdev, page_shift, umr_mode); + + /* Numbers are unsigned, don't subtract to avoid underflow. */ + if (params->log_rq_mtu_frames < + log_pkts_per_wqe + MLX5E_PARAMS_MINIMUM_LOG_RQ_SIZE_MPW) + return MLX5E_PARAMS_MINIMUM_LOG_RQ_SIZE_MPW; + + /* Ethtool's rx_max_pending is calculated for regular RQ, that uses + * pages of PAGE_SIZE. Max length of an XSK RQ might differ if it uses a + * frame size not equal to PAGE_SIZE. + * A stricter condition is checked in mlx5e_mpwrq_validate_xsk, WARN on + * unexpected failure. + */ + if (WARN_ON_ONCE(params->log_rq_mtu_frames > log_pkts_per_wqe + max_log_rq_size)) + return max_log_rq_size; + + return params->log_rq_mtu_frames - log_pkts_per_wqe; +} + +u8 mlx5e_shampo_get_log_hd_entry_size(struct mlx5_core_dev *mdev, + struct mlx5e_params *params) +{ + return order_base_2(DIV_ROUND_UP(MLX5E_RX_MAX_HEAD, MLX5E_SHAMPO_WQ_BASE_HEAD_ENTRY_SIZE)); +} + +u8 mlx5e_shampo_get_log_rsrv_size(struct mlx5_core_dev *mdev, + struct mlx5e_params *params) +{ + return order_base_2(MLX5E_SHAMPO_WQ_RESRV_SIZE / MLX5E_SHAMPO_WQ_BASE_RESRV_SIZE); +} + +u8 mlx5e_shampo_get_log_pkt_per_rsrv(struct mlx5_core_dev *mdev, + struct mlx5e_params *params) +{ + u32 resrv_size = BIT(mlx5e_shampo_get_log_rsrv_size(mdev, params)) * + PAGE_SIZE; + + return order_base_2(DIV_ROUND_UP(resrv_size, params->sw_mtu)); +} + +u8 mlx5e_mpwqe_get_log_stride_size(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk) +{ + if (mlx5e_rx_mpwqe_is_linear_skb(mdev, params, xsk)) + return order_base_2(mlx5e_rx_get_linear_stride_sz(mdev, params, xsk, true)); + + return MLX5_MPWRQ_DEF_LOG_STRIDE_SZ(mdev); +} + +u8 mlx5e_mpwqe_get_log_num_strides(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk) +{ + enum mlx5e_mpwrq_umr_mode umr_mode = mlx5e_mpwrq_umr_mode(mdev, xsk); + u8 page_shift = mlx5e_mpwrq_page_shift(mdev, xsk); + + return mlx5e_mpwrq_log_wqe_sz(mdev, page_shift, umr_mode) - + mlx5e_mpwqe_get_log_stride_size(mdev, params, xsk); +} + +u8 mlx5e_mpwqe_get_min_wqe_bulk(unsigned int wq_sz) +{ +#define UMR_WQE_BULK (2) + return min_t(unsigned int, UMR_WQE_BULK, wq_sz / 2 - 1); +} + +u16 mlx5e_get_rq_headroom(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk) +{ + u16 linear_headroom = mlx5e_get_linear_rq_headroom(params, xsk); + + if (params->rq_wq_type == MLX5_WQ_TYPE_CYCLIC) + return linear_headroom; + + if (mlx5e_rx_mpwqe_is_linear_skb(mdev, params, xsk)) + return linear_headroom; + + if (params->packet_merge.type == MLX5E_PACKET_MERGE_SHAMPO) + return linear_headroom; + + return 0; +} + +u16 mlx5e_calc_sq_stop_room(struct mlx5_core_dev *mdev, struct mlx5e_params *params) +{ + bool is_mpwqe = MLX5E_GET_PFLAG(params, MLX5E_PFLAG_SKB_TX_MPWQE); + u16 stop_room; + + stop_room = mlx5e_ktls_get_stop_room(mdev, params); + stop_room += mlx5e_stop_room_for_max_wqe(mdev); + if (is_mpwqe) + /* A MPWQE can take up to the maximum cacheline-aligned WQE + + * all the normal stop room can be taken if a new packet breaks + * the active MPWQE session and allocates its WQEs right away. + */ + stop_room += mlx5e_stop_room_for_mpwqe(mdev); + + return stop_room; +} + +int mlx5e_validate_params(struct mlx5_core_dev *mdev, struct mlx5e_params *params) +{ + size_t sq_size = 1 << params->log_sq_size; + u16 stop_room; + + stop_room = mlx5e_calc_sq_stop_room(mdev, params); + if (stop_room >= sq_size) { + mlx5_core_err(mdev, "Stop room %u is bigger than the SQ size %zu\n", + stop_room, sq_size); + return -EINVAL; + } + + return 0; +} + +static struct dim_cq_moder mlx5e_get_def_tx_moderation(u8 cq_period_mode) +{ + struct dim_cq_moder moder = {}; + + moder.cq_period_mode = cq_period_mode; + moder.pkts = MLX5E_PARAMS_DEFAULT_TX_CQ_MODERATION_PKTS; + moder.usec = MLX5E_PARAMS_DEFAULT_TX_CQ_MODERATION_USEC; + if (cq_period_mode == MLX5_CQ_PERIOD_MODE_START_FROM_CQE) + moder.usec = MLX5E_PARAMS_DEFAULT_TX_CQ_MODERATION_USEC_FROM_CQE; + + return moder; +} + +static struct dim_cq_moder mlx5e_get_def_rx_moderation(u8 cq_period_mode) +{ + struct dim_cq_moder moder = {}; + + moder.cq_period_mode = cq_period_mode; + moder.pkts = MLX5E_PARAMS_DEFAULT_RX_CQ_MODERATION_PKTS; + moder.usec = MLX5E_PARAMS_DEFAULT_RX_CQ_MODERATION_USEC; + if (cq_period_mode == MLX5_CQ_PERIOD_MODE_START_FROM_CQE) + moder.usec = MLX5E_PARAMS_DEFAULT_RX_CQ_MODERATION_USEC_FROM_CQE; + + return moder; +} + +static u8 mlx5_to_net_dim_cq_period_mode(u8 cq_period_mode) +{ + return cq_period_mode == MLX5_CQ_PERIOD_MODE_START_FROM_CQE ? + DIM_CQ_PERIOD_MODE_START_FROM_CQE : + DIM_CQ_PERIOD_MODE_START_FROM_EQE; +} + +void mlx5e_reset_tx_moderation(struct mlx5e_params *params, u8 cq_period_mode) +{ + if (params->tx_dim_enabled) { + u8 dim_period_mode = mlx5_to_net_dim_cq_period_mode(cq_period_mode); + + params->tx_cq_moderation = net_dim_get_def_tx_moderation(dim_period_mode); + } else { + params->tx_cq_moderation = mlx5e_get_def_tx_moderation(cq_period_mode); + } +} + +void mlx5e_reset_rx_moderation(struct mlx5e_params *params, u8 cq_period_mode) +{ + if (params->rx_dim_enabled) { + u8 dim_period_mode = mlx5_to_net_dim_cq_period_mode(cq_period_mode); + + params->rx_cq_moderation = net_dim_get_def_rx_moderation(dim_period_mode); + } else { + params->rx_cq_moderation = mlx5e_get_def_rx_moderation(cq_period_mode); + } +} + +void mlx5e_set_tx_cq_mode_params(struct mlx5e_params *params, u8 cq_period_mode) +{ + mlx5e_reset_tx_moderation(params, cq_period_mode); + MLX5E_SET_PFLAG(params, MLX5E_PFLAG_TX_CQE_BASED_MODER, + params->tx_cq_moderation.cq_period_mode == + MLX5_CQ_PERIOD_MODE_START_FROM_CQE); +} + +void mlx5e_set_rx_cq_mode_params(struct mlx5e_params *params, u8 cq_period_mode) +{ + mlx5e_reset_rx_moderation(params, cq_period_mode); + MLX5E_SET_PFLAG(params, MLX5E_PFLAG_RX_CQE_BASED_MODER, + params->rx_cq_moderation.cq_period_mode == + MLX5_CQ_PERIOD_MODE_START_FROM_CQE); +} + +bool slow_pci_heuristic(struct mlx5_core_dev *mdev) +{ + u32 link_speed = 0; + u32 pci_bw = 0; + + mlx5e_port_max_linkspeed(mdev, &link_speed); + pci_bw = pcie_bandwidth_available(mdev->pdev, NULL, NULL, NULL); + mlx5_core_dbg_once(mdev, "Max link speed = %d, PCI BW = %d\n", + link_speed, pci_bw); + +#define MLX5E_SLOW_PCI_RATIO (2) + + return link_speed && pci_bw && + link_speed > MLX5E_SLOW_PCI_RATIO * pci_bw; +} + +int mlx5e_mpwrq_validate_regular(struct mlx5_core_dev *mdev, struct mlx5e_params *params) +{ + enum mlx5e_mpwrq_umr_mode umr_mode = mlx5e_mpwrq_umr_mode(mdev, NULL); + u8 page_shift = mlx5e_mpwrq_page_shift(mdev, NULL); + + if (!mlx5e_check_fragmented_striding_rq_cap(mdev, page_shift, umr_mode)) + return -EOPNOTSUPP; + + if (params->xdp_prog && !mlx5e_rx_mpwqe_is_linear_skb(mdev, params, NULL)) + return -EINVAL; + + return 0; +} + +int mlx5e_mpwrq_validate_xsk(struct mlx5_core_dev *mdev, struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk) +{ + enum mlx5e_mpwrq_umr_mode umr_mode = mlx5e_mpwrq_umr_mode(mdev, xsk); + u8 page_shift = mlx5e_mpwrq_page_shift(mdev, xsk); + bool unaligned = xsk ? xsk->unaligned : false; + u16 max_mtu_pkts; + + if (!mlx5e_check_fragmented_striding_rq_cap(mdev, page_shift, umr_mode)) + return -EOPNOTSUPP; + + if (!mlx5e_rx_mpwqe_is_linear_skb(mdev, params, xsk)) + return -EINVAL; + + /* Current RQ length is too big for the given frame size, the + * needed number of WQEs exceeds the maximum. + */ + max_mtu_pkts = min_t(u8, MLX5E_PARAMS_MAXIMUM_LOG_RQ_SIZE, + mlx5e_mpwrq_max_log_rq_pkts(mdev, page_shift, unaligned)); + if (params->log_rq_mtu_frames > max_mtu_pkts) { + mlx5_core_err(mdev, "Current RQ length %d is too big for XSK with given frame size %u\n", + 1 << params->log_rq_mtu_frames, xsk->chunk_size); + return -EINVAL; + } + + return 0; +} + +void mlx5e_init_rq_type_params(struct mlx5_core_dev *mdev, + struct mlx5e_params *params) +{ + params->log_rq_mtu_frames = is_kdump_kernel() ? + MLX5E_PARAMS_MINIMUM_LOG_RQ_SIZE : + MLX5E_PARAMS_DEFAULT_LOG_RQ_SIZE; + + mlx5_core_info(mdev, "MLX5E: StrdRq(%d) RqSz(%ld) StrdSz(%ld) RxCqeCmprss(%d)\n", + params->rq_wq_type == MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ, + params->rq_wq_type == MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ ? + BIT(mlx5e_mpwqe_get_log_rq_size(mdev, params, NULL)) : + BIT(params->log_rq_mtu_frames), + BIT(mlx5e_mpwqe_get_log_stride_size(mdev, params, NULL)), + MLX5E_GET_PFLAG(params, MLX5E_PFLAG_RX_CQE_COMPRESS)); +} + +void mlx5e_set_rq_type(struct mlx5_core_dev *mdev, struct mlx5e_params *params) +{ + params->rq_wq_type = MLX5E_GET_PFLAG(params, MLX5E_PFLAG_RX_STRIDING_RQ) ? + MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ : + MLX5_WQ_TYPE_CYCLIC; +} + +void mlx5e_build_rq_params(struct mlx5_core_dev *mdev, + struct mlx5e_params *params) +{ + /* Prefer Striding RQ, unless any of the following holds: + * - Striding RQ configuration is not possible/supported. + * - CQE compression is ON, and stride_index mini_cqe layout is not supported. + * - Legacy RQ would use linear SKB while Striding RQ would use non-linear. + * + * No XSK params: checking the availability of striding RQ in general. + */ + if ((!MLX5E_GET_PFLAG(params, MLX5E_PFLAG_RX_CQE_COMPRESS) || + MLX5_CAP_GEN(mdev, mini_cqe_resp_stride_index)) && + !mlx5e_mpwrq_validate_regular(mdev, params) && + (mlx5e_rx_mpwqe_is_linear_skb(mdev, params, NULL) || + !mlx5e_rx_is_linear_skb(mdev, params, NULL))) + MLX5E_SET_PFLAG(params, MLX5E_PFLAG_RX_STRIDING_RQ, true); + mlx5e_set_rq_type(mdev, params); + mlx5e_init_rq_type_params(mdev, params); +} + +/* Build queue parameters */ + +void mlx5e_build_create_cq_param(struct mlx5e_create_cq_param *ccp, struct mlx5e_channel *c) +{ + *ccp = (struct mlx5e_create_cq_param) { + .napi = &c->napi, + .ch_stats = c->stats, + .node = cpu_to_node(c->cpu), + .ix = c->ix, + }; +} + +static int mlx5e_max_nonlinear_mtu(int first_frag_size, int frag_size, bool xdp) +{ + if (xdp) + /* XDP requires all fragments to be of the same size. */ + return first_frag_size + (MLX5E_MAX_RX_FRAGS - 1) * frag_size; + + /* Optimization for small packets: the last fragment is bigger than the others. */ + return first_frag_size + (MLX5E_MAX_RX_FRAGS - 2) * frag_size + PAGE_SIZE; +} + +#define DEFAULT_FRAG_SIZE (2048) + +static int mlx5e_build_rq_frags_info(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk, + struct mlx5e_rq_frags_info *info) +{ + u32 byte_count = MLX5E_SW2HW_MTU(params, params->sw_mtu); + int frag_size_max = DEFAULT_FRAG_SIZE; + int first_frag_size_max; + u32 buf_size = 0; + u16 headroom; + int max_mtu; + int i; + + if (mlx5e_rx_is_linear_skb(mdev, params, xsk)) { + int frag_stride; + + frag_stride = mlx5e_rx_get_linear_stride_sz(mdev, params, xsk, false); + + info->arr[0].frag_size = byte_count; + info->arr[0].frag_stride = frag_stride; + info->num_frags = 1; + + /* N WQEs share the same page, N = PAGE_SIZE / frag_stride. The + * first WQE in the page is responsible for allocation of this + * page, this WQE's index is k*N. If WQEs [k*N+1; k*N+N-1] are + * still not completed, the allocation must stop before k*N. + */ + info->wqe_index_mask = (PAGE_SIZE / frag_stride) - 1; + + goto out; + } + + headroom = mlx5e_get_linear_rq_headroom(params, xsk); + first_frag_size_max = SKB_WITH_OVERHEAD(frag_size_max - headroom); + + max_mtu = mlx5e_max_nonlinear_mtu(first_frag_size_max, frag_size_max, + params->xdp_prog); + if (byte_count > max_mtu || params->xdp_prog) { + frag_size_max = PAGE_SIZE; + first_frag_size_max = SKB_WITH_OVERHEAD(frag_size_max - headroom); + + max_mtu = mlx5e_max_nonlinear_mtu(first_frag_size_max, frag_size_max, + params->xdp_prog); + if (byte_count > max_mtu) { + mlx5_core_err(mdev, "MTU %u is too big for non-linear legacy RQ (max %d)\n", + params->sw_mtu, max_mtu); + return -EINVAL; + } + } + + i = 0; + while (buf_size < byte_count) { + int frag_size = byte_count - buf_size; + + if (i == 0) + frag_size = min(frag_size, first_frag_size_max); + else if (i < MLX5E_MAX_RX_FRAGS - 1) + frag_size = min(frag_size, frag_size_max); + + info->arr[i].frag_size = frag_size; + buf_size += frag_size; + + if (params->xdp_prog) { + /* XDP multi buffer expects fragments of the same size. */ + info->arr[i].frag_stride = frag_size_max; + } else { + if (i == 0) { + /* Ensure that headroom and tailroom are included. */ + frag_size += headroom; + frag_size += SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); + } + info->arr[i].frag_stride = roundup_pow_of_two(frag_size); + } + + i++; + } + info->num_frags = i; + + /* The last fragment of WQE with index 2*N may share the page with the + * first fragment of WQE with index 2*N+1 in certain cases. If WQE 2*N+1 + * is not completed yet, WQE 2*N must not be allocated, as it's + * responsible for allocating a new page. + */ + if (frag_size_max == PAGE_SIZE) { + /* No WQE can start in the middle of a page. */ + info->wqe_index_mask = 0; + } else { + /* PAGE_SIZEs starting from 8192 don't use 2K-sized fragments, + * because there would be more than MLX5E_MAX_RX_FRAGS of them. + */ + WARN_ON(PAGE_SIZE != 2 * DEFAULT_FRAG_SIZE); + + /* Odd number of fragments allows to pack the last fragment of + * the previous WQE and the first fragment of the next WQE into + * the same page. + * As long as DEFAULT_FRAG_SIZE is 2048, and MLX5E_MAX_RX_FRAGS + * is 4, the last fragment can be bigger than the rest only if + * it's the fourth one, so WQEs consisting of 3 fragments will + * always share a page. + * When a page is shared, WQE bulk size is 2, otherwise just 1. + */ + info->wqe_index_mask = info->num_frags % 2; + } + +out: + /* Bulking optimization to skip allocation until at least 8 WQEs can be + * allocated in a row. At the same time, never start allocation when + * the page is still used by older WQEs. + */ + info->wqe_bulk = max_t(u8, info->wqe_index_mask + 1, 8); + + info->log_num_frags = order_base_2(info->num_frags); + + return 0; +} + +static u8 mlx5e_get_rqwq_log_stride(u8 wq_type, int ndsegs) +{ + int sz = sizeof(struct mlx5_wqe_data_seg) * ndsegs; + + switch (wq_type) { + case MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ: + sz += sizeof(struct mlx5e_rx_wqe_ll); + break; + default: /* MLX5_WQ_TYPE_CYCLIC */ + sz += sizeof(struct mlx5e_rx_wqe_cyc); + } + + return order_base_2(sz); +} + +static void mlx5e_build_common_cq_param(struct mlx5_core_dev *mdev, + struct mlx5e_cq_param *param) +{ + void *cqc = param->cqc; + + MLX5_SET(cqc, cqc, uar_page, mdev->priv.uar->index); + if (MLX5_CAP_GEN(mdev, cqe_128_always) && cache_line_size() >= 128) + MLX5_SET(cqc, cqc, cqe_sz, CQE_STRIDE_128_PAD); +} + +static u32 mlx5e_shampo_get_log_cq_size(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk) +{ + int rsrv_size = BIT(mlx5e_shampo_get_log_rsrv_size(mdev, params)) * PAGE_SIZE; + u16 num_strides = BIT(mlx5e_mpwqe_get_log_num_strides(mdev, params, xsk)); + int pkt_per_rsrv = BIT(mlx5e_shampo_get_log_pkt_per_rsrv(mdev, params)); + u8 log_stride_sz = mlx5e_mpwqe_get_log_stride_size(mdev, params, xsk); + int wq_size = BIT(mlx5e_mpwqe_get_log_rq_size(mdev, params, xsk)); + int wqe_size = BIT(log_stride_sz) * num_strides; + + /* +1 is for the case that the pkt_per_rsrv dont consume the reservation + * so we get a filler cqe for the rest of the reservation. + */ + return order_base_2((wqe_size / rsrv_size) * wq_size * (pkt_per_rsrv + 1)); +} + +static void mlx5e_build_rx_cq_param(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk, + struct mlx5e_cq_param *param) +{ + bool hw_stridx = false; + void *cqc = param->cqc; + u8 log_cq_size; + + switch (params->rq_wq_type) { + case MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ: + hw_stridx = MLX5_CAP_GEN(mdev, mini_cqe_resp_stride_index); + if (params->packet_merge.type == MLX5E_PACKET_MERGE_SHAMPO) + log_cq_size = mlx5e_shampo_get_log_cq_size(mdev, params, xsk); + else + log_cq_size = mlx5e_mpwqe_get_log_rq_size(mdev, params, xsk) + + mlx5e_mpwqe_get_log_num_strides(mdev, params, xsk); + break; + default: /* MLX5_WQ_TYPE_CYCLIC */ + log_cq_size = params->log_rq_mtu_frames; + } + + MLX5_SET(cqc, cqc, log_cq_size, log_cq_size); + if (MLX5E_GET_PFLAG(params, MLX5E_PFLAG_RX_CQE_COMPRESS)) { + MLX5_SET(cqc, cqc, mini_cqe_res_format, hw_stridx ? + MLX5_CQE_FORMAT_CSUM_STRIDX : MLX5_CQE_FORMAT_CSUM); + MLX5_SET(cqc, cqc, cqe_comp_en, 1); + } + + mlx5e_build_common_cq_param(mdev, param); + param->cq_period_mode = params->rx_cq_moderation.cq_period_mode; +} + +static u8 rq_end_pad_mode(struct mlx5_core_dev *mdev, struct mlx5e_params *params) +{ + bool lro_en = params->packet_merge.type == MLX5E_PACKET_MERGE_LRO; + bool ro = pcie_relaxed_ordering_enabled(mdev->pdev) && + MLX5_CAP_GEN(mdev, relaxed_ordering_write); + + return ro && lro_en ? + MLX5_WQ_END_PAD_MODE_NONE : MLX5_WQ_END_PAD_MODE_ALIGN; +} + +int mlx5e_build_rq_param(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk, + u16 q_counter, + struct mlx5e_rq_param *param) +{ + void *rqc = param->rqc; + void *wq = MLX5_ADDR_OF(rqc, rqc, wq); + int ndsegs = 1; + int err; + + switch (params->rq_wq_type) { + case MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ: { + u8 log_wqe_num_of_strides = mlx5e_mpwqe_get_log_num_strides(mdev, params, xsk); + u8 log_wqe_stride_size = mlx5e_mpwqe_get_log_stride_size(mdev, params, xsk); + enum mlx5e_mpwrq_umr_mode umr_mode = mlx5e_mpwrq_umr_mode(mdev, xsk); + u8 page_shift = mlx5e_mpwrq_page_shift(mdev, xsk); + + if (!mlx5e_verify_rx_mpwqe_strides(mdev, log_wqe_stride_size, + log_wqe_num_of_strides, + page_shift, umr_mode)) { + mlx5_core_err(mdev, + "Bad RX MPWQE params: log_stride_size %u, log_num_strides %u, umr_mode %d\n", + log_wqe_stride_size, log_wqe_num_of_strides, + umr_mode); + return -EINVAL; + } + + MLX5_SET(wq, wq, log_wqe_num_of_strides, + log_wqe_num_of_strides - MLX5_MPWQE_LOG_NUM_STRIDES_BASE); + MLX5_SET(wq, wq, log_wqe_stride_size, + log_wqe_stride_size - MLX5_MPWQE_LOG_STRIDE_SZ_BASE); + MLX5_SET(wq, wq, log_wq_sz, mlx5e_mpwqe_get_log_rq_size(mdev, params, xsk)); + if (params->packet_merge.type == MLX5E_PACKET_MERGE_SHAMPO) { + MLX5_SET(wq, wq, shampo_enable, true); + MLX5_SET(wq, wq, log_reservation_size, + mlx5e_shampo_get_log_rsrv_size(mdev, params)); + MLX5_SET(wq, wq, + log_max_num_of_packets_per_reservation, + mlx5e_shampo_get_log_pkt_per_rsrv(mdev, params)); + MLX5_SET(wq, wq, log_headers_entry_size, + mlx5e_shampo_get_log_hd_entry_size(mdev, params)); + MLX5_SET(rqc, rqc, reservation_timeout, + params->packet_merge.timeout); + MLX5_SET(rqc, rqc, shampo_match_criteria_type, + params->packet_merge.shampo.match_criteria_type); + MLX5_SET(rqc, rqc, shampo_no_match_alignment_granularity, + params->packet_merge.shampo.alignment_granularity); + } + break; + } + default: /* MLX5_WQ_TYPE_CYCLIC */ + MLX5_SET(wq, wq, log_wq_sz, params->log_rq_mtu_frames); + err = mlx5e_build_rq_frags_info(mdev, params, xsk, ¶m->frags_info); + if (err) + return err; + ndsegs = param->frags_info.num_frags; + } + + MLX5_SET(wq, wq, wq_type, params->rq_wq_type); + MLX5_SET(wq, wq, end_padding_mode, rq_end_pad_mode(mdev, params)); + MLX5_SET(wq, wq, log_wq_stride, + mlx5e_get_rqwq_log_stride(params->rq_wq_type, ndsegs)); + MLX5_SET(wq, wq, pd, mdev->mlx5e_res.hw_objs.pdn); + MLX5_SET(rqc, rqc, counter_set_id, q_counter); + MLX5_SET(rqc, rqc, vsd, params->vlan_strip_disable); + MLX5_SET(rqc, rqc, scatter_fcs, params->scatter_fcs_en); + + param->wq.buf_numa_node = dev_to_node(mlx5_core_dma_dev(mdev)); + mlx5e_build_rx_cq_param(mdev, params, xsk, ¶m->cqp); + + return 0; +} + +void mlx5e_build_drop_rq_param(struct mlx5_core_dev *mdev, + u16 q_counter, + struct mlx5e_rq_param *param) +{ + void *rqc = param->rqc; + void *wq = MLX5_ADDR_OF(rqc, rqc, wq); + + MLX5_SET(wq, wq, wq_type, MLX5_WQ_TYPE_CYCLIC); + MLX5_SET(wq, wq, log_wq_stride, + mlx5e_get_rqwq_log_stride(MLX5_WQ_TYPE_CYCLIC, 1)); + MLX5_SET(rqc, rqc, counter_set_id, q_counter); + + param->wq.buf_numa_node = dev_to_node(mlx5_core_dma_dev(mdev)); +} + +void mlx5e_build_tx_cq_param(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_cq_param *param) +{ + void *cqc = param->cqc; + + MLX5_SET(cqc, cqc, log_cq_size, params->log_sq_size); + + mlx5e_build_common_cq_param(mdev, param); + param->cq_period_mode = params->tx_cq_moderation.cq_period_mode; +} + +void mlx5e_build_sq_param_common(struct mlx5_core_dev *mdev, + struct mlx5e_sq_param *param) +{ + void *sqc = param->sqc; + void *wq = MLX5_ADDR_OF(sqc, sqc, wq); + + MLX5_SET(wq, wq, log_wq_stride, ilog2(MLX5_SEND_WQE_BB)); + MLX5_SET(wq, wq, pd, mdev->mlx5e_res.hw_objs.pdn); + + param->wq.buf_numa_node = dev_to_node(mlx5_core_dma_dev(mdev)); +} + +void mlx5e_build_sq_param(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_sq_param *param) +{ + void *sqc = param->sqc; + void *wq = MLX5_ADDR_OF(sqc, sqc, wq); + bool allow_swp; + + allow_swp = mlx5_geneve_tx_allowed(mdev) || + (mlx5_ipsec_device_caps(mdev) & MLX5_IPSEC_CAP_CRYPTO); + mlx5e_build_sq_param_common(mdev, param); + MLX5_SET(wq, wq, log_wq_sz, params->log_sq_size); + MLX5_SET(sqc, sqc, allow_swp, allow_swp); + param->is_mpw = MLX5E_GET_PFLAG(params, MLX5E_PFLAG_SKB_TX_MPWQE); + param->stop_room = mlx5e_calc_sq_stop_room(mdev, params); + mlx5e_build_tx_cq_param(mdev, params, ¶m->cqp); +} + +static void mlx5e_build_ico_cq_param(struct mlx5_core_dev *mdev, + u8 log_wq_size, + struct mlx5e_cq_param *param) +{ + void *cqc = param->cqc; + + MLX5_SET(cqc, cqc, log_cq_size, log_wq_size); + + mlx5e_build_common_cq_param(mdev, param); + + param->cq_period_mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE; +} + +/* This function calculates the maximum number of headers entries that are needed + * per WQE, the formula is based on the size of the reservations and the + * restriction we have about max packets for reservation that is equal to max + * headers per reservation. + */ +u32 mlx5e_shampo_hd_per_wqe(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_rq_param *rq_param) +{ + int resv_size = BIT(mlx5e_shampo_get_log_rsrv_size(mdev, params)) * PAGE_SIZE; + u16 num_strides = BIT(mlx5e_mpwqe_get_log_num_strides(mdev, params, NULL)); + int pkt_per_resv = BIT(mlx5e_shampo_get_log_pkt_per_rsrv(mdev, params)); + u8 log_stride_sz = mlx5e_mpwqe_get_log_stride_size(mdev, params, NULL); + int wqe_size = BIT(log_stride_sz) * num_strides; + u32 hd_per_wqe; + + /* Assumption: hd_per_wqe % 8 == 0. */ + hd_per_wqe = (wqe_size / resv_size) * pkt_per_resv; + mlx5_core_dbg(mdev, "%s hd_per_wqe = %d rsrv_size = %d wqe_size = %d pkt_per_resv = %d\n", + __func__, hd_per_wqe, resv_size, wqe_size, pkt_per_resv); + return hd_per_wqe; +} + +/* This function calculates the maximum number of headers entries that are needed + * for the WQ, this value is uesed to allocate the header buffer in HW, thus + * must be a pow of 2. + */ +u32 mlx5e_shampo_hd_per_wq(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_rq_param *rq_param) +{ + void *wqc = MLX5_ADDR_OF(rqc, rq_param->rqc, wq); + int wq_size = BIT(MLX5_GET(wq, wqc, log_wq_sz)); + u32 hd_per_wqe, hd_per_wq; + + hd_per_wqe = mlx5e_shampo_hd_per_wqe(mdev, params, rq_param); + hd_per_wq = roundup_pow_of_two(hd_per_wqe * wq_size); + return hd_per_wq; +} + +static u32 mlx5e_shampo_icosq_sz(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_rq_param *rq_param) +{ + int max_num_of_umr_per_wqe, max_hd_per_wqe, max_klm_per_umr, rest; + void *wqc = MLX5_ADDR_OF(rqc, rq_param->rqc, wq); + int wq_size = BIT(MLX5_GET(wq, wqc, log_wq_sz)); + u32 wqebbs; + + max_klm_per_umr = MLX5E_MAX_KLM_PER_WQE(mdev); + max_hd_per_wqe = mlx5e_shampo_hd_per_wqe(mdev, params, rq_param); + max_num_of_umr_per_wqe = max_hd_per_wqe / max_klm_per_umr; + rest = max_hd_per_wqe % max_klm_per_umr; + wqebbs = MLX5E_KLM_UMR_WQEBBS(max_klm_per_umr) * max_num_of_umr_per_wqe; + if (rest) + wqebbs += MLX5E_KLM_UMR_WQEBBS(rest); + wqebbs *= wq_size; + return wqebbs; +} + +static u32 mlx5e_mpwrq_total_umr_wqebbs(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk) +{ + enum mlx5e_mpwrq_umr_mode umr_mode = mlx5e_mpwrq_umr_mode(mdev, xsk); + u8 page_shift = mlx5e_mpwrq_page_shift(mdev, xsk); + u8 umr_wqebbs; + + umr_wqebbs = mlx5e_mpwrq_umr_wqebbs(mdev, page_shift, umr_mode); + + return umr_wqebbs * (1 << mlx5e_mpwqe_get_log_rq_size(mdev, params, xsk)); +} + +static u8 mlx5e_build_icosq_log_wq_sz(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_rq_param *rqp) +{ + u32 wqebbs, total_pages, useful_space; + + /* MLX5_WQ_TYPE_CYCLIC */ + if (params->rq_wq_type != MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ) + return MLX5E_PARAMS_MINIMUM_LOG_SQ_SIZE; + + /* UMR WQEs for the regular RQ. */ + wqebbs = mlx5e_mpwrq_total_umr_wqebbs(mdev, params, NULL); + + /* If XDP program is attached, XSK may be turned on at any time without + * restarting the channel. ICOSQ must be big enough to fit UMR WQEs of + * both regular RQ and XSK RQ. + * + * XSK uses different values of page_shift, and the total number of UMR + * WQEBBs depends on it. This dependency is complex and not monotonic, + * especially taking into consideration that some of the parameters come + * from capabilities. Hence, we have to try all valid values of XSK + * frame size (and page_shift) to find the maximum. + */ + if (params->xdp_prog) { + u32 max_xsk_wqebbs = 0; + u8 frame_shift; + + for (frame_shift = XDP_UMEM_MIN_CHUNK_SHIFT; + frame_shift <= PAGE_SHIFT; frame_shift++) { + /* The headroom doesn't affect the calculation. */ + struct mlx5e_xsk_param xsk = { + .chunk_size = 1 << frame_shift, + .unaligned = false, + }; + + /* XSK aligned mode. */ + max_xsk_wqebbs = max(max_xsk_wqebbs, + mlx5e_mpwrq_total_umr_wqebbs(mdev, params, &xsk)); + + /* XSK unaligned mode, frame size is a power of two. */ + xsk.unaligned = true; + max_xsk_wqebbs = max(max_xsk_wqebbs, + mlx5e_mpwrq_total_umr_wqebbs(mdev, params, &xsk)); + + /* XSK unaligned mode, frame size is not equal to stride size. */ + xsk.chunk_size -= 1; + max_xsk_wqebbs = max(max_xsk_wqebbs, + mlx5e_mpwrq_total_umr_wqebbs(mdev, params, &xsk)); + + /* XSK unaligned mode, frame size is a triple power of two. */ + xsk.chunk_size = (1 << frame_shift) / 4 * 3; + max_xsk_wqebbs = max(max_xsk_wqebbs, + mlx5e_mpwrq_total_umr_wqebbs(mdev, params, &xsk)); + } + + wqebbs += max_xsk_wqebbs; + } + + if (params->packet_merge.type == MLX5E_PACKET_MERGE_SHAMPO) + wqebbs += mlx5e_shampo_icosq_sz(mdev, params, rqp); + + /* UMR WQEs don't cross the page boundary, they are padded with NOPs. + * This padding is always smaller than the max WQE size. That gives us + * at least (PAGE_SIZE - (max WQE size - MLX5_SEND_WQE_BB)) useful bytes + * per page. The number of pages is estimated as the total size of WQEs + * divided by the useful space in page, rounding up. If some WQEs don't + * fully fit into the useful space, they can occupy part of the padding, + * which proves this estimation to be correct (reserve enough space). + */ + useful_space = PAGE_SIZE - mlx5e_get_max_sq_wqebbs(mdev) + MLX5_SEND_WQE_BB; + total_pages = DIV_ROUND_UP(wqebbs * MLX5_SEND_WQE_BB, useful_space); + wqebbs = total_pages * (PAGE_SIZE / MLX5_SEND_WQE_BB); + + return max_t(u8, MLX5E_PARAMS_MINIMUM_LOG_SQ_SIZE, order_base_2(wqebbs)); +} + +static u8 mlx5e_build_async_icosq_log_wq_sz(struct mlx5_core_dev *mdev) +{ + if (mlx5e_is_ktls_rx(mdev)) + return MLX5E_PARAMS_DEFAULT_LOG_SQ_SIZE; + + return MLX5E_PARAMS_MINIMUM_LOG_SQ_SIZE; +} + +static void mlx5e_build_icosq_param(struct mlx5_core_dev *mdev, + u8 log_wq_size, + struct mlx5e_sq_param *param) +{ + void *sqc = param->sqc; + void *wq = MLX5_ADDR_OF(sqc, sqc, wq); + + mlx5e_build_sq_param_common(mdev, param); + + MLX5_SET(wq, wq, log_wq_sz, log_wq_size); + MLX5_SET(sqc, sqc, reg_umr, MLX5_CAP_ETH(mdev, reg_umr_sq)); + mlx5e_build_ico_cq_param(mdev, log_wq_size, ¶m->cqp); +} + +static void mlx5e_build_async_icosq_param(struct mlx5_core_dev *mdev, + u8 log_wq_size, + struct mlx5e_sq_param *param) +{ + void *sqc = param->sqc; + void *wq = MLX5_ADDR_OF(sqc, sqc, wq); + + mlx5e_build_sq_param_common(mdev, param); + param->stop_room = mlx5e_stop_room_for_wqe(mdev, 1); /* for XSK NOP */ + param->is_tls = mlx5e_is_ktls_rx(mdev); + if (param->is_tls) + param->stop_room += mlx5e_stop_room_for_wqe(mdev, 1); /* for TLS RX resync NOP */ + MLX5_SET(sqc, sqc, reg_umr, MLX5_CAP_ETH(mdev, reg_umr_sq)); + MLX5_SET(wq, wq, log_wq_sz, log_wq_size); + mlx5e_build_ico_cq_param(mdev, log_wq_size, ¶m->cqp); +} + +void mlx5e_build_xdpsq_param(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + struct mlx5e_xsk_param *xsk, + struct mlx5e_sq_param *param) +{ + void *sqc = param->sqc; + void *wq = MLX5_ADDR_OF(sqc, sqc, wq); + + mlx5e_build_sq_param_common(mdev, param); + MLX5_SET(wq, wq, log_wq_sz, params->log_sq_size); + param->is_mpw = MLX5E_GET_PFLAG(params, MLX5E_PFLAG_XDP_TX_MPWQE); + param->is_xdp_mb = !mlx5e_rx_is_linear_skb(mdev, params, xsk); + mlx5e_build_tx_cq_param(mdev, params, ¶m->cqp); +} + +int mlx5e_build_channel_param(struct mlx5_core_dev *mdev, + struct mlx5e_params *params, + u16 q_counter, + struct mlx5e_channel_param *cparam) +{ + u8 icosq_log_wq_sz, async_icosq_log_wq_sz; + int err; + + err = mlx5e_build_rq_param(mdev, params, NULL, q_counter, &cparam->rq); + if (err) + return err; + + icosq_log_wq_sz = mlx5e_build_icosq_log_wq_sz(mdev, params, &cparam->rq); + async_icosq_log_wq_sz = mlx5e_build_async_icosq_log_wq_sz(mdev); + + mlx5e_build_sq_param(mdev, params, &cparam->txq_sq); + mlx5e_build_xdpsq_param(mdev, params, NULL, &cparam->xdp_sq); + mlx5e_build_icosq_param(mdev, icosq_log_wq_sz, &cparam->icosq); + mlx5e_build_async_icosq_param(mdev, async_icosq_log_wq_sz, &cparam->async_icosq); + + return 0; +} |