From 44af95718fed5f24a0036b3e270dbc854005beee Mon Sep 17 00:00:00 2001 From: Maksym Glubokiy Date: Tue, 23 Aug 2022 14:39:58 +0300 Subject: [PATCH] net: prestera: manage matchall and flower priorities matchall rules can be added only to chain 0 and their priorities have limitations: - new matchall ingress rule's priority must be higher (lower value) than any existing flower rule; - new matchall egress rule's priority must be lower (higher value) than any existing flower rule. The opposite works for flower rule adding: - new flower ingress rule's priority must be lower (higher value) than any existing matchall rule; - new flower egress rule's priority must be higher (lower value) than any existing matchall rule. This is a hardware limitation and thus must be properly handled in driver by reporting errors to the user when newly added rule has such a priority that cannot be installed into the hardware. To achieve this, the driver must maintain both min/max matchall priorities for every flower block when user adds/deletes a matchall rule, as well as both min/max flower priorities for chain 0 for every adding/deletion of flower rules for chain 0. Cc: Serhiy Boiko Signed-off-by: Maksym Glubokiy Signed-off-by: David S. Miller --- .../net/ethernet/marvell/prestera/prestera_acl.c | 43 ++++++++++++++++ .../net/ethernet/marvell/prestera/prestera_acl.h | 2 + .../net/ethernet/marvell/prestera/prestera_flow.c | 3 ++ .../net/ethernet/marvell/prestera/prestera_flow.h | 5 ++ .../ethernet/marvell/prestera/prestera_flower.c | 48 ++++++++++++++++++ .../ethernet/marvell/prestera/prestera_flower.h | 2 + .../ethernet/marvell/prestera/prestera_matchall.c | 58 ++++++++++++++++++++++ .../ethernet/marvell/prestera/prestera_matchall.h | 2 + 8 files changed, 163 insertions(+) diff --git a/drivers/net/ethernet/marvell/prestera/prestera_acl.c b/drivers/net/ethernet/marvell/prestera/prestera_acl.c index 3d4b85f..0fa7541 100644 --- a/drivers/net/ethernet/marvell/prestera/prestera_acl.c +++ b/drivers/net/ethernet/marvell/prestera/prestera_acl.c @@ -54,6 +54,10 @@ struct prestera_acl_ruleset { struct prestera_acl_ruleset_ht_key ht_key; struct rhashtable rule_ht; struct prestera_acl *acl; + struct { + u32 min; + u32 max; + } prio; unsigned long rule_count; refcount_t refcount; void *keymask; @@ -162,6 +166,9 @@ prestera_acl_ruleset_create(struct prestera_acl *acl, ruleset->pcl_id = PRESTERA_ACL_PCL_ID_MAKE((u8)uid, chain_index); ruleset->index = uid; + ruleset->prio.min = UINT_MAX; + ruleset->prio.max = 0; + err = rhashtable_insert_fast(&acl->ruleset_ht, &ruleset->ht_node, prestera_acl_ruleset_ht_params); if (err) @@ -365,6 +372,26 @@ prestera_acl_ruleset_block_unbind(struct prestera_acl_ruleset *ruleset, block->ruleset_zero = NULL; } +static void +prestera_acl_ruleset_prio_refresh(struct prestera_acl *acl, + struct prestera_acl_ruleset *ruleset) +{ + struct prestera_acl_rule *rule; + + ruleset->prio.min = UINT_MAX; + ruleset->prio.max = 0; + + list_for_each_entry(rule, &acl->rules, list) { + if (ruleset->ingress != rule->ruleset->ingress) + continue; + if (ruleset->ht_key.chain_index != rule->chain_index) + continue; + + ruleset->prio.min = min(ruleset->prio.min, rule->priority); + ruleset->prio.max = max(ruleset->prio.max, rule->priority); + } +} + void prestera_acl_rule_keymask_pcl_id_set(struct prestera_acl_rule *rule, u16 pcl_id) { @@ -389,6 +416,13 @@ u32 prestera_acl_ruleset_index_get(const struct prestera_acl_ruleset *ruleset) return ruleset->index; } +void prestera_acl_ruleset_prio_get(struct prestera_acl_ruleset *ruleset, + u32 *prio_min, u32 *prio_max) +{ + *prio_min = ruleset->prio.min; + *prio_max = ruleset->prio.max; +} + bool prestera_acl_ruleset_is_offload(struct prestera_acl_ruleset *ruleset) { return ruleset->offload; @@ -429,6 +463,13 @@ void prestera_acl_rule_destroy(struct prestera_acl_rule *rule) kfree(rule); } +static void prestera_acl_ruleset_prio_update(struct prestera_acl_ruleset *ruleset, + u32 prio) +{ + ruleset->prio.min = min(ruleset->prio.min, prio); + ruleset->prio.max = max(ruleset->prio.max, prio); +} + int prestera_acl_rule_add(struct prestera_switch *sw, struct prestera_acl_rule *rule) { @@ -468,6 +509,7 @@ int prestera_acl_rule_add(struct prestera_switch *sw, list_add_tail(&rule->list, &sw->acl->rules); ruleset->rule_count++; + prestera_acl_ruleset_prio_update(ruleset, rule->priority); return 0; err_acl_block_bind: @@ -492,6 +534,7 @@ void prestera_acl_rule_del(struct prestera_switch *sw, list_del(&rule->list); prestera_acl_rule_entry_destroy(sw->acl, rule->re); + prestera_acl_ruleset_prio_refresh(sw->acl, ruleset); /* unbind block (all ports) */ if (!ruleset->ht_key.chain_index && !ruleset->rule_count) diff --git a/drivers/net/ethernet/marvell/prestera/prestera_acl.h b/drivers/net/ethernet/marvell/prestera/prestera_acl.h index 03fc5b9..d45ee88 100644 --- a/drivers/net/ethernet/marvell/prestera/prestera_acl.h +++ b/drivers/net/ethernet/marvell/prestera/prestera_acl.h @@ -195,6 +195,8 @@ int prestera_acl_ruleset_bind(struct prestera_acl_ruleset *ruleset, int prestera_acl_ruleset_unbind(struct prestera_acl_ruleset *ruleset, struct prestera_port *port); u32 prestera_acl_ruleset_index_get(const struct prestera_acl_ruleset *ruleset); +void prestera_acl_ruleset_prio_get(struct prestera_acl_ruleset *ruleset, + u32 *prio_min, u32 *prio_max); void prestera_acl_rule_keymask_pcl_id_set(struct prestera_acl_rule *rule, u16 pcl_id); diff --git a/drivers/net/ethernet/marvell/prestera/prestera_flow.c b/drivers/net/ethernet/marvell/prestera/prestera_flow.c index 3f81eef..9f4267f 100644 --- a/drivers/net/ethernet/marvell/prestera/prestera_flow.c +++ b/drivers/net/ethernet/marvell/prestera/prestera_flow.c @@ -90,6 +90,9 @@ prestera_flow_block_create(struct prestera_switch *sw, INIT_LIST_HEAD(&block->template_list); block->net = net; block->sw = sw; + block->mall.prio_min = UINT_MAX; + block->mall.prio_max = 0; + block->mall.bound = false; block->ingress = ingress; return block; diff --git a/drivers/net/ethernet/marvell/prestera/prestera_flow.h b/drivers/net/ethernet/marvell/prestera/prestera_flow.h index 0c9e132..a85a3eb 100644 --- a/drivers/net/ethernet/marvell/prestera/prestera_flow.h +++ b/drivers/net/ethernet/marvell/prestera/prestera_flow.h @@ -22,6 +22,11 @@ struct prestera_flow_block { struct prestera_acl_ruleset *ruleset_zero; struct flow_block_cb *block_cb; struct list_head template_list; + struct { + u32 prio_min; + u32 prio_max; + bool bound; + } mall; unsigned int rule_count; bool ingress; }; diff --git a/drivers/net/ethernet/marvell/prestera/prestera_flower.c b/drivers/net/ethernet/marvell/prestera/prestera_flower.c index 19d3b55..f38e8b3 100644 --- a/drivers/net/ethernet/marvell/prestera/prestera_flower.c +++ b/drivers/net/ethernet/marvell/prestera/prestera_flower.c @@ -5,6 +5,7 @@ #include "prestera_acl.h" #include "prestera_flow.h" #include "prestera_flower.h" +#include "prestera_matchall.h" struct prestera_flower_template { struct prestera_acl_ruleset *ruleset; @@ -360,6 +361,49 @@ static int prestera_flower_parse(struct prestera_flow_block *block, f->common.extack); } +static int prestera_flower_prio_check(struct prestera_flow_block *block, + struct flow_cls_offload *f) +{ + u32 mall_prio_min; + u32 mall_prio_max; + int err; + + err = prestera_mall_prio_get(block, &mall_prio_min, &mall_prio_max); + if (err == -ENOENT) + /* No matchall filters installed on this chain. */ + return 0; + + if (err) { + NL_SET_ERR_MSG(f->common.extack, "Failed to get matchall priorities"); + return err; + } + + if (f->common.prio <= mall_prio_max && block->ingress) { + NL_SET_ERR_MSG(f->common.extack, + "Failed to add in front of existing matchall rules"); + return -EOPNOTSUPP; + } + if (f->common.prio >= mall_prio_min && !block->ingress) { + NL_SET_ERR_MSG(f->common.extack, "Failed to add behind of existing matchall rules"); + return -EOPNOTSUPP; + } + + return 0; +} + +int prestera_flower_prio_get(struct prestera_flow_block *block, u32 chain_index, + u32 *prio_min, u32 *prio_max) +{ + struct prestera_acl_ruleset *ruleset; + + ruleset = prestera_acl_ruleset_lookup(block->sw->acl, block, chain_index); + if (IS_ERR(ruleset)) + return PTR_ERR(ruleset); + + prestera_acl_ruleset_prio_get(ruleset, prio_min, prio_max); + return 0; +} + int prestera_flower_replace(struct prestera_flow_block *block, struct flow_cls_offload *f) { @@ -368,6 +412,10 @@ int prestera_flower_replace(struct prestera_flow_block *block, struct prestera_acl_rule *rule; int err; + err = prestera_flower_prio_check(block, f); + if (err) + return err; + ruleset = prestera_acl_ruleset_get(acl, block, f->common.chain_index); if (IS_ERR(ruleset)) return PTR_ERR(ruleset); diff --git a/drivers/net/ethernet/marvell/prestera/prestera_flower.h b/drivers/net/ethernet/marvell/prestera/prestera_flower.h index 495f151..1181115 100644 --- a/drivers/net/ethernet/marvell/prestera/prestera_flower.h +++ b/drivers/net/ethernet/marvell/prestera/prestera_flower.h @@ -19,5 +19,7 @@ int prestera_flower_tmplt_create(struct prestera_flow_block *block, void prestera_flower_tmplt_destroy(struct prestera_flow_block *block, struct flow_cls_offload *f); void prestera_flower_template_cleanup(struct prestera_flow_block *block); +int prestera_flower_prio_get(struct prestera_flow_block *block, u32 chain_index, + u32 *prio_min, u32 *prio_max); #endif /* _PRESTERA_FLOWER_H_ */ diff --git a/drivers/net/ethernet/marvell/prestera/prestera_matchall.c b/drivers/net/ethernet/marvell/prestera/prestera_matchall.c index 3fc1317..6f2b95a 100644 --- a/drivers/net/ethernet/marvell/prestera/prestera_matchall.c +++ b/drivers/net/ethernet/marvell/prestera/prestera_matchall.c @@ -11,6 +11,54 @@ #include "prestera_matchall.h" #include "prestera_span.h" +static int prestera_mall_prio_check(struct prestera_flow_block *block, + struct tc_cls_matchall_offload *f) +{ + u32 flower_prio_min; + u32 flower_prio_max; + int err; + + err = prestera_flower_prio_get(block, f->common.chain_index, + &flower_prio_min, &flower_prio_max); + if (err == -ENOENT) + /* No flower filters installed on this chain. */ + return 0; + + if (err) { + NL_SET_ERR_MSG(f->common.extack, "Failed to get flower priorities"); + return err; + } + + if (f->common.prio <= flower_prio_max && !block->ingress) { + NL_SET_ERR_MSG(f->common.extack, "Failed to add in front of existing flower rules"); + return -EOPNOTSUPP; + } + if (f->common.prio >= flower_prio_min && block->ingress) { + NL_SET_ERR_MSG(f->common.extack, "Failed to add behind of existing flower rules"); + return -EOPNOTSUPP; + } + + return 0; +} + +int prestera_mall_prio_get(struct prestera_flow_block *block, + u32 *prio_min, u32 *prio_max) +{ + if (!block->mall.bound) + return -ENOENT; + + *prio_min = block->mall.prio_min; + *prio_max = block->mall.prio_max; + return 0; +} + +static void prestera_mall_prio_update(struct prestera_flow_block *block, + struct tc_cls_matchall_offload *f) +{ + block->mall.prio_min = min(block->mall.prio_min, f->common.prio); + block->mall.prio_max = max(block->mall.prio_max, f->common.prio); +} + int prestera_mall_replace(struct prestera_flow_block *block, struct tc_cls_matchall_offload *f) { @@ -40,6 +88,10 @@ int prestera_mall_replace(struct prestera_flow_block *block, if (protocol != htons(ETH_P_ALL)) return -EOPNOTSUPP; + err = prestera_mall_prio_check(block, f); + if (err) + return err; + port = netdev_priv(act->dev); list_for_each_entry(binding, &block->binding_list, list) { @@ -48,6 +100,9 @@ int prestera_mall_replace(struct prestera_flow_block *block, goto rollback; } + prestera_mall_prio_update(block, f); + + block->mall.bound = true; return 0; rollback: @@ -64,4 +119,7 @@ void prestera_mall_destroy(struct prestera_flow_block *block) list_for_each_entry(binding, &block->binding_list, list) prestera_span_rule_del(binding, block->ingress); + block->mall.prio_min = UINT_MAX; + block->mall.prio_max = 0; + block->mall.bound = false; } diff --git a/drivers/net/ethernet/marvell/prestera/prestera_matchall.h b/drivers/net/ethernet/marvell/prestera/prestera_matchall.h index 31ad4d0..fed08be 100644 --- a/drivers/net/ethernet/marvell/prestera/prestera_matchall.h +++ b/drivers/net/ethernet/marvell/prestera/prestera_matchall.h @@ -11,5 +11,7 @@ struct prestera_flow_block; int prestera_mall_replace(struct prestera_flow_block *block, struct tc_cls_matchall_offload *f); void prestera_mall_destroy(struct prestera_flow_block *block); +int prestera_mall_prio_get(struct prestera_flow_block *block, + u32 *prio_min, u32 *prio_max); #endif /* _PRESTERA_MATCHALL_H_ */ -- 2.7.4