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Message-ID: <ceb00673-8151-49b0-b36b-75b5dc402041@linux.dev>
Date: Wed, 11 Sep 2024 16:56:03 +0100
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Linu Cherian <lcherian@...vell.com>, davem@...emloft.net,
sgoutham@...vell.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: gakula@...vell.com, hkelam@...vell.com, sbhatta@...vell.com,
edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Subject: Re: [PATCH net-next 1/2] octeontx2-af: Knobs for NPC default rule
counters
On 11/09/2024 15:33, Linu Cherian wrote:
> Add devlink knobs to enable/disable counters on NPC
> default rule entries.
>
> Introduce lowlevel variant of rvu_mcam_remove/add_counter_from/to_rule
> for better code reuse, which assumes necessary locks are taken at
> higher level.
>
> Sample command to enable default rule counters:
> devlink dev param set <dev> name npc_def_rule_cntr value true cmode runtime
>
> Sample command to read the counter:
> cat /sys/kernel/debug/cn10k/npc/mcam_rules
>
> Signed-off-by: Linu Cherian <lcherian@...vell.com>
> ---
> .../net/ethernet/marvell/octeontx2/af/rvu.h | 8 +-
> .../marvell/octeontx2/af/rvu_devlink.c | 32 +++++
> .../ethernet/marvell/octeontx2/af/rvu_npc.c | 132 ++++++++++++++++--
> .../marvell/octeontx2/af/rvu_npc_fs.c | 36 ++---
> 4 files changed, 171 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu.h b/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
> index 43b1d83686d1..fb4b88e94649 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
> +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
> @@ -526,6 +526,7 @@ struct rvu {
> struct mutex alias_lock; /* Serialize bar2 alias access */
> int vfs; /* Number of VFs attached to RVU */
> u16 vf_devid; /* VF devices id */
> + bool def_rule_cntr_en;
> int nix_blkaddr[MAX_NIX_BLKS];
>
> /* Mbox */
> @@ -961,7 +962,11 @@ void rvu_npc_disable_default_entries(struct rvu *rvu, u16 pcifunc, int nixlf);
> void rvu_npc_enable_default_entries(struct rvu *rvu, u16 pcifunc, int nixlf);
> void rvu_npc_update_flowkey_alg_idx(struct rvu *rvu, u16 pcifunc, int nixlf,
> int group, int alg_idx, int mcam_index);
> -
> +void __rvu_mcam_remove_counter_from_rule(struct rvu *rvu, u16 pcifunc,
> + struct rvu_npc_mcam_rule *rule);
> +void __rvu_mcam_add_counter_to_rule(struct rvu *rvu, u16 pcifunc,
> + struct rvu_npc_mcam_rule *rule,
> + struct npc_install_flow_rsp *rsp);
> void rvu_npc_get_mcam_entry_alloc_info(struct rvu *rvu, u16 pcifunc,
> int blkaddr, int *alloc_cnt,
> int *enable_cnt);
> @@ -986,6 +991,7 @@ void npc_set_mcam_action(struct rvu *rvu, struct npc_mcam *mcam,
> void npc_read_mcam_entry(struct rvu *rvu, struct npc_mcam *mcam,
> int blkaddr, u16 src, struct mcam_entry *entry,
> u8 *intf, u8 *ena);
> +int npc_config_cntr_default_entries(struct rvu *rvu, bool enable);
> bool is_cgx_config_permitted(struct rvu *rvu, u16 pcifunc);
> bool is_mac_feature_supported(struct rvu *rvu, int pf, int feature);
> u32 rvu_cgx_get_fifolen(struct rvu *rvu);
> diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
> index 7498ab429963..9c26e19a860b 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
> @@ -1238,6 +1238,7 @@ enum rvu_af_dl_param_id {
> RVU_AF_DEVLINK_PARAM_ID_DWRR_MTU,
> RVU_AF_DEVLINK_PARAM_ID_NPC_MCAM_ZONE_PERCENT,
> RVU_AF_DEVLINK_PARAM_ID_NPC_EXACT_FEATURE_DISABLE,
> + RVU_AF_DEVLINK_PARAM_ID_NPC_DEF_RULE_CNTR_ENABLE,
> RVU_AF_DEVLINK_PARAM_ID_NIX_MAXLF,
> };
>
> @@ -1358,6 +1359,32 @@ static int rvu_af_dl_npc_mcam_high_zone_percent_validate(struct devlink *devlink
> return 0;
> }
>
> +static int rvu_af_dl_npc_def_rule_cntr_get(struct devlink *devlink, u32 id,
> + struct devlink_param_gset_ctx *ctx)
> +{
> + struct rvu_devlink *rvu_dl = devlink_priv(devlink);
> + struct rvu *rvu = rvu_dl->rvu;
> +
> + ctx->val.vbool = rvu->def_rule_cntr_en;
> +
> + return 0;
> +}
> +
> +static int rvu_af_dl_npc_def_rule_cntr_set(struct devlink *devlink, u32 id,
> + struct devlink_param_gset_ctx *ctx,
> + struct netlink_ext_ack *extack)
> +{
> + struct rvu_devlink *rvu_dl = devlink_priv(devlink);
> + struct rvu *rvu = rvu_dl->rvu;
> + int err;
> +
> + err = npc_config_cntr_default_entries(rvu, ctx->val.vbool);
> + if (!err)
> + rvu->def_rule_cntr_en = ctx->val.vbool;
> +
> + return err;
> +}
> +
> static int rvu_af_dl_nix_maxlf_get(struct devlink *devlink, u32 id,
> struct devlink_param_gset_ctx *ctx)
> {
> @@ -1444,6 +1471,11 @@ static const struct devlink_param rvu_af_dl_params[] = {
> rvu_af_dl_npc_mcam_high_zone_percent_get,
> rvu_af_dl_npc_mcam_high_zone_percent_set,
> rvu_af_dl_npc_mcam_high_zone_percent_validate),
> + DEVLINK_PARAM_DRIVER(RVU_AF_DEVLINK_PARAM_ID_NPC_DEF_RULE_CNTR_ENABLE,
> + "npc_def_rule_cntr", DEVLINK_PARAM_TYPE_BOOL,
> + BIT(DEVLINK_PARAM_CMODE_RUNTIME),
> + rvu_af_dl_npc_def_rule_cntr_get,
> + rvu_af_dl_npc_def_rule_cntr_set, NULL),
> DEVLINK_PARAM_DRIVER(RVU_AF_DEVLINK_PARAM_ID_NIX_MAXLF,
> "nix_maxlf", DEVLINK_PARAM_TYPE_U16,
> BIT(DEVLINK_PARAM_CMODE_RUNTIME),
> diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
> index 97722ce8c4cb..a766870520b3 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
> @@ -2691,6 +2691,51 @@ void npc_mcam_rsrcs_reserve(struct rvu *rvu, int blkaddr, int entry_idx)
> npc_mcam_set_bit(mcam, entry_idx);
> }
>
> +int npc_config_cntr_default_entries(struct rvu *rvu, bool enable)
> +{
> + struct npc_install_flow_rsp rsp = { 0 };
> + struct npc_mcam *mcam = &rvu->hw->mcam;
> + struct rvu_npc_mcam_rule *rule;
> + int blkaddr;
> +
> + blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
> + if (blkaddr < 0)
> + return -EINVAL;
> +
> + mutex_lock(&mcam->lock);
> + list_for_each_entry(rule, &mcam->mcam_rules, list) {
> + if (!is_mcam_entry_enabled(rvu, mcam, blkaddr, rule->entry))
> + continue;
> + if (!rule->default_rule)
> + continue;
> + if (enable && !rule->has_cntr) { /* Alloc and map new counter */
> + __rvu_mcam_add_counter_to_rule(rvu, rule->owner,
> + rule, &rsp);
> + if (rsp.counter < 0) {
> + dev_err(rvu->dev, "%s: Err to allocate cntr for default rule (err=%d)\n",
> + __func__, rsp.counter);
> + break;
> + }
> + npc_map_mcam_entry_and_cntr(rvu, mcam, blkaddr,
> + rule->entry, rsp.counter);
> + }
> +
> + if (enable && rule->has_cntr) /* Reset counter before use */ {
> + rvu_write64(rvu, blkaddr,
> + NPC_AF_MATCH_STATX(rule->cntr), 0x0);
> + continue;
> + }
> +
> + if (!enable && rule->has_cntr) /* Free and unmap counter */ {
> + __rvu_mcam_remove_counter_from_rule(rvu, rule->owner,
> + rule);
> + }
> + }
> + mutex_unlock(&mcam->lock);
> +
> + return 0;
> +}
> +
> int rvu_mbox_handler_npc_mcam_alloc_entry(struct rvu *rvu,
> struct npc_mcam_alloc_entry_req *req,
> struct npc_mcam_alloc_entry_rsp *rsp)
> @@ -2975,9 +3020,9 @@ int rvu_mbox_handler_npc_mcam_shift_entry(struct rvu *rvu,
> return rc;
> }
>
> -int rvu_mbox_handler_npc_mcam_alloc_counter(struct rvu *rvu,
> - struct npc_mcam_alloc_counter_req *req,
> - struct npc_mcam_alloc_counter_rsp *rsp)
> +static int __npc_mcam_alloc_counter(struct rvu *rvu,
> + struct npc_mcam_alloc_counter_req *req,
> + struct npc_mcam_alloc_counter_rsp *rsp)
> {
> struct npc_mcam *mcam = &rvu->hw->mcam;
> u16 pcifunc = req->hdr.pcifunc;
> @@ -2998,7 +3043,6 @@ int rvu_mbox_handler_npc_mcam_alloc_counter(struct rvu *rvu,
> if (!req->contig && req->count > NPC_MAX_NONCONTIG_COUNTERS)
> return NPC_MCAM_INVALID_REQ;
>
> - mutex_lock(&mcam->lock);
>
> /* Check if unused counters are available or not */
> if (!rvu_rsrc_free_count(&mcam->counters)) {
> @@ -3035,12 +3079,27 @@ int rvu_mbox_handler_npc_mcam_alloc_counter(struct rvu *rvu,
> }
> }
>
> - mutex_unlock(&mcam->lock);
There is mutex_unlock() left in this function in error path of
rvu_rsrc_free_count(&mcam->counters)
> return 0;
> }
>
> -int rvu_mbox_handler_npc_mcam_free_counter(struct rvu *rvu,
> - struct npc_mcam_oper_counter_req *req, struct msg_rsp *rsp)
> +int rvu_mbox_handler_npc_mcam_alloc_counter(struct rvu *rvu,
> + struct npc_mcam_alloc_counter_req *req,
> + struct npc_mcam_alloc_counter_rsp *rsp)
> +{
> + struct npc_mcam *mcam = &rvu->hw->mcam;
> + int err;
> +
> + mutex_lock(&mcam->lock);
> +
> + err = __npc_mcam_alloc_counter(rvu, req, rsp);
> +
> + mutex_unlock(&mcam->lock);
> + return err;
> +}
> +
> +static int __npc_mcam_free_counter(struct rvu *rvu,
> + struct npc_mcam_oper_counter_req *req,
> + struct msg_rsp *rsp)
> {
> struct npc_mcam *mcam = &rvu->hw->mcam;
> u16 index, entry = 0;
> @@ -3050,7 +3109,6 @@ int rvu_mbox_handler_npc_mcam_free_counter(struct rvu *rvu,
> if (blkaddr < 0)
> return NPC_MCAM_INVALID_REQ;
>
> - mutex_lock(&mcam->lock);
> err = npc_mcam_verify_counter(mcam, req->hdr.pcifunc, req->cntr);
> if (err) {
> mutex_unlock(&mcam->lock);
And here it's even visible in the chunk..
> @@ -3077,10 +3135,66 @@ int rvu_mbox_handler_npc_mcam_free_counter(struct rvu *rvu,
> index, req->cntr);
> }
>
> - mutex_unlock(&mcam->lock);
> return 0;
> }
>
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