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/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
/* Copyright (C) 2018 Netronome Systems, Inc. */
#ifndef __NFP_ABM_H__
#define __NFP_ABM_H__ 1
#include <linux/bits.h>
#include <linux/list.h>
#include <linux/radix-tree.h>
#include <net/devlink.h>
#include <net/pkt_cls.h>
#include <net/pkt_sched.h>
/* Dump of 64 PRIOs and 256 REDs seems to take 850us on Xeon v4 @ 2.20GHz;
* 2.5ms / 400Hz seems more than sufficient for stats resolution.
*/
#define NFP_ABM_STATS_REFRESH_IVAL (2500 * 1000) /* ns */
#define NFP_ABM_LVL_INFINITY S32_MAX
struct nfp_app;
struct nfp_net;
#define NFP_ABM_PORTID_TYPE GENMASK(23, 16)
#define NFP_ABM_PORTID_ID GENMASK(7, 0)
/* The possible actions if thresholds are exceeded */
enum nfp_abm_q_action {
/* mark if ECN capable, otherwise drop */
NFP_ABM_ACT_MARK_DROP = 0,
/* mark if ECN capable, otherwise goto QM */
NFP_ABM_ACT_MARK_QUEUE = 1,
NFP_ABM_ACT_DROP = 2,
NFP_ABM_ACT_QUEUE = 3,
NFP_ABM_ACT_NOQUEUE = 4,
};
/**
* struct nfp_abm - ABM NIC app structure
* @app: back pointer to nfp_app
* @pf_id: ID of our PF link
*
* @red_support: is RED offload supported
* @num_prios: number of supported DSCP priorities
* @num_bands: number of supported DSCP priority bands
* @action_mask: bitmask of supported actions
*
* @thresholds: current threshold configuration
* @threshold_undef: bitmap of thresholds which have not been set
* @actions: current FW action configuration
* @num_thresholds: number of @thresholds and bits in @threshold_undef
*
* @prio_map_len: computed length of FW priority map (in bytes)
* @dscp_mask: mask FW will apply on DSCP field
*
* @eswitch_mode: devlink eswitch mode, advanced functions only visible
* in switchdev mode
*
* @q_lvls: queue level control area
* @qm_stats: queue statistics symbol
* @q_stats: basic queue statistics (only in per-band case)
*/
struct nfp_abm {
struct nfp_app *app;
unsigned int pf_id;
unsigned int red_support;
unsigned int num_prios;
unsigned int num_bands;
unsigned int action_mask;
u32 *thresholds;
unsigned long *threshold_undef;
u8 *actions;
size_t num_thresholds;
unsigned int prio_map_len;
u8 dscp_mask;
enum devlink_eswitch_mode eswitch_mode;
const struct nfp_rtsym *q_lvls;
const struct nfp_rtsym *qm_stats;
const struct nfp_rtsym *q_stats;
};
/**
* struct nfp_alink_stats - ABM NIC statistics
* @tx_pkts: number of TXed packets
* @tx_bytes: number of TXed bytes
* @backlog_pkts: momentary backlog length (packets)
* @backlog_bytes: momentary backlog length (bytes)
* @overlimits: number of ECN marked TXed packets (accumulative)
* @drops: number of tail-dropped packets (accumulative)
*/
struct nfp_alink_stats {
u64 tx_pkts;
u64 tx_bytes;
u64 backlog_pkts;
u64 backlog_bytes;
u64 overlimits;
u64 drops;
};
/**
* struct nfp_alink_xstats - extended ABM NIC statistics
* @ecn_marked: number of ECN marked TXed packets
* @pdrop: number of hard drops due to queue limit
*/
struct nfp_alink_xstats {
u64 ecn_marked;
u64 pdrop;
};
enum nfp_qdisc_type {
NFP_QDISC_NONE = 0,
NFP_QDISC_MQ,
NFP_QDISC_RED,
NFP_QDISC_GRED,
};
#define NFP_QDISC_UNTRACKED ((struct nfp_qdisc *)1UL)
/**
* struct nfp_qdisc - tracked TC Qdisc
* @netdev: netdev on which Qdisc was created
* @type: Qdisc type
* @handle: handle of this Qdisc
* @parent_handle: handle of the parent (unreliable if Qdisc was grafted)
* @use_cnt: number of attachment points in the hierarchy
* @num_children: current size of the @children array
* @children: pointers to children
*
* @params_ok: parameters of this Qdisc are OK for offload
* @offload_mark: offload refresh state - selected for offload
* @offloaded: Qdisc is currently offloaded to the HW
*
* @mq: MQ Qdisc specific parameters and state
* @mq.stats: current stats of the MQ Qdisc
* @mq.prev_stats: previously reported @mq.stats
*
* @red: RED Qdisc specific parameters and state
* @red.num_bands: Number of valid entries in the @red.band table
* @red.band: Per-band array of RED instances
* @red.band.ecn: ECN marking is enabled (rather than drop)
* @red.band.threshold: ECN marking threshold
* @red.band.stats: current stats of the RED Qdisc
* @red.band.prev_stats: previously reported @red.stats
* @red.band.xstats: extended stats for RED - current
* @red.band.prev_xstats: extended stats for RED - previously reported
*/
struct nfp_qdisc {
struct net_device *netdev;
enum nfp_qdisc_type type;
u32 handle;
u32 parent_handle;
unsigned int use_cnt;
unsigned int num_children;
struct nfp_qdisc **children;
bool params_ok;
bool offload_mark;
bool offloaded;
union {
/* NFP_QDISC_MQ */
struct {
struct nfp_alink_stats stats;
struct nfp_alink_stats prev_stats;
} mq;
/* TC_SETUP_QDISC_RED, TC_SETUP_QDISC_GRED */
struct {
unsigned int num_bands;
struct {
bool ecn;
u32 threshold;
struct nfp_alink_stats stats;
struct nfp_alink_stats prev_stats;
struct nfp_alink_xstats xstats;
struct nfp_alink_xstats prev_xstats;
} band[MAX_DPs];
} red;
};
};
/**
* struct nfp_abm_link - port tuple of a ABM NIC
* @abm: back pointer to nfp_abm
* @vnic: data vNIC
* @id: id of the data vNIC
* @queue_base: id of base to host queue within PCIe (not QC idx)
* @total_queues: number of PF queues
*
* @last_stats_update: ktime of last stats update
*
* @prio_map: current map of priorities
* @has_prio: @prio_map is valid
*
* @def_band: default band to use
* @dscp_map: list of DSCP to band mappings
*
* @root_qdisc: pointer to the current root of the Qdisc hierarchy
* @qdiscs: all qdiscs recorded by major part of the handle
*/
struct nfp_abm_link {
struct nfp_abm *abm;
struct nfp_net *vnic;
unsigned int id;
unsigned int queue_base;
unsigned int total_queues;
u64 last_stats_update;
u32 *prio_map;
bool has_prio;
u8 def_band;
struct list_head dscp_map;
struct nfp_qdisc *root_qdisc;
struct radix_tree_root qdiscs;
};
static inline bool nfp_abm_has_prio(struct nfp_abm *abm)
{
return abm->num_bands > 1;
}
static inline bool nfp_abm_has_drop(struct nfp_abm *abm)
{
return abm->action_mask & BIT(NFP_ABM_ACT_DROP);
}
static inline bool nfp_abm_has_mark(struct nfp_abm *abm)
{
return abm->action_mask & BIT(NFP_ABM_ACT_MARK_DROP);
}
void nfp_abm_qdisc_offload_update(struct nfp_abm_link *alink);
int nfp_abm_setup_root(struct net_device *netdev, struct nfp_abm_link *alink,
struct tc_root_qopt_offload *opt);
int nfp_abm_setup_tc_red(struct net_device *netdev, struct nfp_abm_link *alink,
struct tc_red_qopt_offload *opt);
int nfp_abm_setup_tc_mq(struct net_device *netdev, struct nfp_abm_link *alink,
struct tc_mq_qopt_offload *opt);
int nfp_abm_setup_tc_gred(struct net_device *netdev, struct nfp_abm_link *alink,
struct tc_gred_qopt_offload *opt);
int nfp_abm_setup_cls_block(struct net_device *netdev, struct nfp_repr *repr,
struct tc_block_offload *opt);
int nfp_abm_ctrl_read_params(struct nfp_abm_link *alink);
int nfp_abm_ctrl_find_addrs(struct nfp_abm *abm);
int __nfp_abm_ctrl_set_q_lvl(struct nfp_abm *abm, unsigned int id, u32 val);
int nfp_abm_ctrl_set_q_lvl(struct nfp_abm_link *alink, unsigned int band,
unsigned int queue, u32 val);
int __nfp_abm_ctrl_set_q_act(struct nfp_abm *abm, unsigned int id,
enum nfp_abm_q_action act);
int nfp_abm_ctrl_set_q_act(struct nfp_abm_link *alink, unsigned int band,
unsigned int queue, enum nfp_abm_q_action act);
int nfp_abm_ctrl_read_q_stats(struct nfp_abm_link *alink,
unsigned int band, unsigned int queue,
struct nfp_alink_stats *stats);
int nfp_abm_ctrl_read_q_xstats(struct nfp_abm_link *alink,
unsigned int band, unsigned int queue,
struct nfp_alink_xstats *xstats);
u64 nfp_abm_ctrl_stat_non_sto(struct nfp_abm_link *alink, unsigned int i);
u64 nfp_abm_ctrl_stat_sto(struct nfp_abm_link *alink, unsigned int i);
int nfp_abm_ctrl_qm_enable(struct nfp_abm *abm);
int nfp_abm_ctrl_qm_disable(struct nfp_abm *abm);
void nfp_abm_prio_map_update(struct nfp_abm *abm);
int nfp_abm_ctrl_prio_map_update(struct nfp_abm_link *alink, u32 *packed);
#endif
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