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 <serhiy.boiko@plvision.eu>
Signed-off-by: Maksym Glubokiy <maksym.glubokiy@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Maksym Glubokiy 2022-08-23 14:39:58 +03:00 committed by David S. Miller
parent 8c448c2b5f
commit 44af95718f
8 changed files with 163 additions and 0 deletions

View File

@ -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)

View File

@ -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);

View File

@ -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;

View File

@ -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;
};

View File

@ -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);

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@ -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_ */

View File

@ -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;
}

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@ -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_ */