Re: [PATCH net-next 1/2] octeontx2-af: Knobs for NPC default rule counters

From: Linu Cherian
Date: Thu Sep 12 2024 - 11:34:29 EST

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In reply to: Vadim Fedorenko: "Re: [PATCH net-next 1/2] octeontx2-af: Knobs for NPC default rule counters"
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Hi Vadim,

On 2024-09-11 at 21:26:03, Vadim Fedorenko (vadim.fedorenko@xxxxxxxxx) wrote:
> 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@xxxxxxxxxxx>
> > ---
> > .../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)

Ack. Will fix in v2

>
> > 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..

Ack. Thanks for pointing out, somehow missed the error paths.

>
> > @@ -3077,10 +3135,66 @@ int rvu_mbox_handler_npc_mcam_free_counter(struct rvu *rvu,
> > index, req->cntr);
> > }
> > - mutex_unlock(&mcam->lock);
> > return 0;
> > }
>

Linu Cherian.

Next message: Usama Arif: "Re: [RFC] efi/tpm: add efi.tpm_log as a reserved region in 820_table_firmware"
Previous message: Jon Kohler: "Re: [PATCH] vfio-mdev: reinstate VFIO_MDEV Kconfig"
In reply to: Vadim Fedorenko: "Re: [PATCH net-next 1/2] octeontx2-af: Knobs for NPC default rule counters"
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