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linux-stable/drivers/net/ethernet/mellanox/mlx5/core/en/params.c

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// 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_FLEX_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_FLEX_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)
{
u32 sz;
/* 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;
sz = roundup_pow_of_two(mlx5e_rx_get_linear_sz_skb(params, false));
/* XDP in mlx5e doesn't support multiple packets per page.
* Do not assume sz <= PAGE_SIZE if params->xdp_prog is set.
*/
return params->xdp_prog && sz < PAGE_SIZE ? PAGE_SIZE : sz;
}
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_verify_params_rx_mpwqe_strides(struct mlx5_core_dev *mdev,
struct mlx5e_params *params,
struct mlx5e_xsk_param *xsk)
{
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);
return mlx5e_verify_rx_mpwqe_strides(mdev, log_wqe_stride_size,
log_wqe_num_of_strides,
page_shift, umr_mode);
}
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));
/* XDP in mlx5e doesn't support multiple packets per page. */
if (params->xdp_prog)
return PAGE_SHIFT;
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);
u8 log_wqe_size, log_stride_size;
log_wqe_size = mlx5e_mpwrq_log_wqe_sz(mdev, page_shift, umr_mode);
log_stride_size = mlx5e_mpwqe_get_log_stride_size(mdev, params, xsk);
WARN(log_wqe_size < log_stride_size,
"Log WQE size %u < log stride size %u (page shift %u, umr mode %d, xsk on? %d)\n",
log_wqe_size, log_stride_size, page_shift, umr_mode, !!xsk);
return log_wqe_size - log_stride_size;
}
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;
mlx5_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;
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);
u16 max_mtu_pkts;
if (!mlx5e_check_fragmented_striding_rq_cap(mdev, page_shift, umr_mode)) {
mlx5_core_err(mdev, "Striding RQ for XSK can't be activated with page_shift %u and umr_mode %d\n",
page_shift, umr_mode);
return -EOPNOTSUPP;
}
if (!mlx5e_rx_mpwqe_is_linear_skb(mdev, params, xsk)) {
mlx5_core_err(mdev, "Striding RQ linear mode for XSK can't be activated with current params\n");
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, xsk->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;
}
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;
}
static void mlx5e_rx_compute_wqe_bulk_params(struct mlx5e_params *params,
struct mlx5e_rq_frags_info *info)
{
u16 bulk_bound_rq_size = (1 << params->log_rq_mtu_frames) / 4;
u32 bulk_bound_rq_size_in_bytes;
u32 sum_frag_strides = 0;
u32 wqe_bulk_in_bytes;
u16 split_factor;
u32 wqe_bulk;
int i;
for (i = 0; i < info->num_frags; i++)
sum_frag_strides += info->arr[i].frag_stride;
/* For MTUs larger than PAGE_SIZE, align to PAGE_SIZE to reflect
* amount of consumed pages per wqe in bytes.
*/
if (sum_frag_strides > PAGE_SIZE)
sum_frag_strides = ALIGN(sum_frag_strides, PAGE_SIZE);
bulk_bound_rq_size_in_bytes = bulk_bound_rq_size * sum_frag_strides;
#define MAX_WQE_BULK_BYTES(xdp) ((xdp ? 256 : 512) * 1024)
/* A WQE bulk should not exceed min(512KB, 1/4 of rq size). For XDP
* keep bulk size smaller to avoid filling the page_pool cache on
* every bulk refill.
*/
wqe_bulk_in_bytes = min_t(u32, MAX_WQE_BULK_BYTES(params->xdp_prog),
bulk_bound_rq_size_in_bytes);
wqe_bulk = DIV_ROUND_UP(wqe_bulk_in_bytes, sum_frag_strides);
/* Make sure that allocations don't start when the page is still used
* by older WQEs.
*/
info->wqe_bulk = max_t(u16, info->wqe_index_mask + 1, wqe_bulk);
split_factor = DIV_ROUND_UP(MAX_WQE_BULK_BYTES(params->xdp_prog),
PP_ALLOC_CACHE_REFILL * PAGE_SIZE);
info->refill_unit = DIV_ROUND_UP(info->wqe_bulk, split_factor);
}
#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 *xdp_frag_size)
{
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 a large enough number
* of WQEs can be allocated in a row. Bulking also influences how well
* deferred page release works.
*/
mlx5e_rx_compute_wqe_bulk_params(params, info);
mlx5_core_dbg(mdev, "%s: wqe_bulk = %u, wqe_bulk_refill_unit = %u\n",
__func__, info->wqe_bulk, info->refill_unit);
info->log_num_frags = order_base_2(info->num_frags);
*xdp_frag_size = info->num_frags > 1 && params->xdp_prog ? PAGE_SIZE : 0;
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_compression_layout,
MLX5_CAP_GEN(mdev, enhanced_cqe_compression) ?
MLX5_CQE_COMPRESS_LAYOUT_ENHANCED :
MLX5_CQE_COMPRESS_LAYOUT_BASIC);
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 = 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, &param->frags_info,
&param->xdp_frag_size);
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, &param->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);
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, &param->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, &param->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, &param->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, &param->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;
}
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