Proxmox-Port/linux-loongson
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson synced 2025-09-03 17:51:23 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
loongarch-next
linux-loongson/drivers/net/ethernet/mellanox/mlxsw/spectrum2_mr_tcam.c
Amit Cohen 92953e7aab mlxsw: Edit IPv6 key blocks to use one less block for multicast forwarding 
Two ACL regions that are configured by the driver during initialization are
the ones used for IPv4 and IPv6 multicast forwarding. Entries residing
in these two regions match on the {SIP, DIP, VRID} key elements.

Currently for IPv6 region, 9 key blocks are used:
* 4 for SIP - 'ipv4_1', 'ipv6_{3,4,5}'
* 4 for DIP - 'ipv4_0', 'ipv6_{0,1,2/2b}'
* 1 for VRID - 'ipv4_4b'

This can be improved by reducing the amount key blocks needed for
the IPv6 region to 8. It is possible to use key blocks that mix subsets of
the VRID element with subsets of the DIP element.
The following key blocks can be used:
* 4 for SIP - 'ipv4_1', 'ipv6_{3,4,5}'
* 1 for subset of DIP - 'ipv4_0'
* 3 for the rest of DIP and subsets of VRID - 'ipv6_{0,1,2/2b}'

To make this happen, add VRID sub-elements as part of existing keys -
'ipv6_{0,1,2/2b}'. Note that one of the sub-elements is called
VRID_ROUTER_MSB and does not contain bit numbers like the rest, as for
Spectrum < 4 this element represents bits 8-10 and for Spectrum-4 it
represents bits 8-11.

Breaking VRID into 3 sub-elements makes the driver use one less block in
IPv6 region for multicast forwarding. The sub-elements can be filled in
blocks that are used for destination IP.

The algorithm in the driver that chooses which key blocks will be used is
lazy and not the optimal one. It searches the block that contains the most
elements that are required, chooses it, removes the elements that appear
in the chosen block and starts again searching the block that contains the
most elements.

When key block 'ipv4_4' is defined, the algorithm might choose it, as it
contains 2 sub-elements of VRID, then 8 blocks must be chosen for SIP and
DIP and we get 9 blocks to match on {SIP, DIP, VRID}. That is why we had to
remove key block 'ipv4_4' in a previous patch and use key block that
contains one field for VRID.

This improvement was tested and indeed 8 blocks are used instead of 9.

Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2023-09-22 08:26:30 +01:00

335 lines
9.8 KiB
C
Raw Permalink Blame History

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/* Copyright (c) 2018 Mellanox Technologies. All rights reserved */
#include <linux/kernel.h>
#include "core_acl_flex_actions.h"
#include "spectrum.h"
#include "spectrum_mr.h"
struct mlxsw_sp2_mr_tcam {
struct mlxsw_sp *mlxsw_sp;
struct mlxsw_sp_flow_block *flow_block;
struct mlxsw_sp_acl_ruleset *ruleset4;
struct mlxsw_sp_acl_ruleset *ruleset6;
};
struct mlxsw_sp2_mr_route {
struct mlxsw_sp2_mr_tcam *mr_tcam;
};
static struct mlxsw_sp_acl_ruleset *
mlxsw_sp2_mr_tcam_proto_ruleset(struct mlxsw_sp2_mr_tcam *mr_tcam,
enum mlxsw_sp_l3proto proto)
{
switch (proto) {
case MLXSW_SP_L3_PROTO_IPV4:
return mr_tcam->ruleset4;
case MLXSW_SP_L3_PROTO_IPV6:
return mr_tcam->ruleset6;
}
return NULL;
}
static int mlxsw_sp2_mr_tcam_bind_group(struct mlxsw_sp *mlxsw_sp,
enum mlxsw_reg_pemrbt_protocol protocol,
struct mlxsw_sp_acl_ruleset *ruleset)
{
char pemrbt_pl[MLXSW_REG_PEMRBT_LEN];
u16 group_id;
group_id = mlxsw_sp_acl_ruleset_group_id(ruleset);
mlxsw_reg_pemrbt_pack(pemrbt_pl, protocol, group_id);
return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(pemrbt), pemrbt_pl);
}
static const enum mlxsw_afk_element mlxsw_sp2_mr_tcam_usage_ipv4[] = {
MLXSW_AFK_ELEMENT_VIRT_ROUTER,
MLXSW_AFK_ELEMENT_SRC_IP_0_31,
MLXSW_AFK_ELEMENT_DST_IP_0_31,
};
static int mlxsw_sp2_mr_tcam_ipv4_init(struct mlxsw_sp2_mr_tcam *mr_tcam)
{
struct mlxsw_afk_element_usage elusage;
int err;
/* Initialize IPv4 ACL group. */
mlxsw_afk_element_usage_fill(&elusage,
mlxsw_sp2_mr_tcam_usage_ipv4,
ARRAY_SIZE(mlxsw_sp2_mr_tcam_usage_ipv4));
mr_tcam->ruleset4 = mlxsw_sp_acl_ruleset_get(mr_tcam->mlxsw_sp,
mr_tcam->flow_block,
MLXSW_SP_L3_PROTO_IPV4,
MLXSW_SP_ACL_PROFILE_MR,
&elusage);
if (IS_ERR(mr_tcam->ruleset4))
return PTR_ERR(mr_tcam->ruleset4);
/* MC Router groups should be bound before routes are inserted. */
err = mlxsw_sp2_mr_tcam_bind_group(mr_tcam->mlxsw_sp,
MLXSW_REG_PEMRBT_PROTO_IPV4,
mr_tcam->ruleset4);
if (err)
goto err_bind_group;
return 0;
err_bind_group:
mlxsw_sp_acl_ruleset_put(mr_tcam->mlxsw_sp, mr_tcam->ruleset4);
return err;
}
static void mlxsw_sp2_mr_tcam_ipv4_fini(struct mlxsw_sp2_mr_tcam *mr_tcam)
{
mlxsw_sp_acl_ruleset_put(mr_tcam->mlxsw_sp, mr_tcam->ruleset4);
}
static const enum mlxsw_afk_element mlxsw_sp2_mr_tcam_usage_ipv6[] = {
MLXSW_AFK_ELEMENT_VIRT_ROUTER_0_3,
MLXSW_AFK_ELEMENT_VIRT_ROUTER_4_7,
MLXSW_AFK_ELEMENT_VIRT_ROUTER_MSB,
MLXSW_AFK_ELEMENT_SRC_IP_96_127,
MLXSW_AFK_ELEMENT_SRC_IP_64_95,
MLXSW_AFK_ELEMENT_SRC_IP_32_63,
MLXSW_AFK_ELEMENT_SRC_IP_0_31,
MLXSW_AFK_ELEMENT_DST_IP_96_127,
MLXSW_AFK_ELEMENT_DST_IP_64_95,
MLXSW_AFK_ELEMENT_DST_IP_32_63,
MLXSW_AFK_ELEMENT_DST_IP_0_31,
};
static int mlxsw_sp2_mr_tcam_ipv6_init(struct mlxsw_sp2_mr_tcam *mr_tcam)
{
struct mlxsw_afk_element_usage elusage;
int err;
/* Initialize IPv6 ACL group */
mlxsw_afk_element_usage_fill(&elusage,
mlxsw_sp2_mr_tcam_usage_ipv6,
ARRAY_SIZE(mlxsw_sp2_mr_tcam_usage_ipv6));
mr_tcam->ruleset6 = mlxsw_sp_acl_ruleset_get(mr_tcam->mlxsw_sp,
mr_tcam->flow_block,
MLXSW_SP_L3_PROTO_IPV6,
MLXSW_SP_ACL_PROFILE_MR,
&elusage);
if (IS_ERR(mr_tcam->ruleset6))
return PTR_ERR(mr_tcam->ruleset6);
/* MC Router groups should be bound before routes are inserted. */
err = mlxsw_sp2_mr_tcam_bind_group(mr_tcam->mlxsw_sp,
MLXSW_REG_PEMRBT_PROTO_IPV6,
mr_tcam->ruleset6);
if (err)
goto err_bind_group;
return 0;
err_bind_group:
mlxsw_sp_acl_ruleset_put(mr_tcam->mlxsw_sp, mr_tcam->ruleset6);
return err;
}
static void mlxsw_sp2_mr_tcam_ipv6_fini(struct mlxsw_sp2_mr_tcam *mr_tcam)
{
mlxsw_sp_acl_ruleset_put(mr_tcam->mlxsw_sp, mr_tcam->ruleset6);
}
static void
mlxsw_sp2_mr_tcam_rule_parse4(struct mlxsw_sp_acl_rule_info *rulei,
struct mlxsw_sp_mr_route_key *key)
{
mlxsw_sp_acl_rulei_keymask_u32(rulei, MLXSW_AFK_ELEMENT_VIRT_ROUTER,
key->vrid, GENMASK(11, 0));
mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_SRC_IP_0_31,
(char *) &key->source.addr4,
(char *) &key->source_mask.addr4, 4);
mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_DST_IP_0_31,
(char *) &key->group.addr4,
(char *) &key->group_mask.addr4, 4);
}
static void
mlxsw_sp2_mr_tcam_rule_parse6(struct mlxsw_sp_acl_rule_info *rulei,
struct mlxsw_sp_mr_route_key *key)
{
mlxsw_sp_acl_rulei_keymask_u32(rulei, MLXSW_AFK_ELEMENT_VIRT_ROUTER_0_3,
key->vrid, GENMASK(3, 0));
mlxsw_sp_acl_rulei_keymask_u32(rulei, MLXSW_AFK_ELEMENT_VIRT_ROUTER_4_7,
key->vrid >> 4, GENMASK(3, 0));
mlxsw_sp_acl_rulei_keymask_u32(rulei,
MLXSW_AFK_ELEMENT_VIRT_ROUTER_MSB,
key->vrid >> 8, GENMASK(3, 0));
mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_SRC_IP_96_127,
&key->source.addr6.s6_addr[0x0],
&key->source_mask.addr6.s6_addr[0x0], 4);
mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_SRC_IP_64_95,
&key->source.addr6.s6_addr[0x4],
&key->source_mask.addr6.s6_addr[0x4], 4);
mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_SRC_IP_32_63,
&key->source.addr6.s6_addr[0x8],
&key->source_mask.addr6.s6_addr[0x8], 4);
mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_SRC_IP_0_31,
&key->source.addr6.s6_addr[0xc],
&key->source_mask.addr6.s6_addr[0xc], 4);
mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_DST_IP_96_127,
&key->group.addr6.s6_addr[0x0],
&key->group_mask.addr6.s6_addr[0x0], 4);
mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_DST_IP_64_95,
&key->group.addr6.s6_addr[0x4],
&key->group_mask.addr6.s6_addr[0x4], 4);
mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_DST_IP_32_63,
&key->group.addr6.s6_addr[0x8],
&key->group_mask.addr6.s6_addr[0x8], 4);
mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_DST_IP_0_31,
&key->group.addr6.s6_addr[0xc],
&key->group_mask.addr6.s6_addr[0xc], 4);
}
static void
mlxsw_sp2_mr_tcam_rule_parse(struct mlxsw_sp_acl_rule *rule,
struct mlxsw_sp_mr_route_key *key,
unsigned int priority)
{
struct mlxsw_sp_acl_rule_info *rulei;
rulei = mlxsw_sp_acl_rule_rulei(rule);
rulei->priority = priority;
switch (key->proto) {
case MLXSW_SP_L3_PROTO_IPV4:
return mlxsw_sp2_mr_tcam_rule_parse4(rulei, key);
case MLXSW_SP_L3_PROTO_IPV6:
return mlxsw_sp2_mr_tcam_rule_parse6(rulei, key);
}
}
static int
mlxsw_sp2_mr_tcam_route_create(struct mlxsw_sp *mlxsw_sp, void *priv,
void *route_priv,
struct mlxsw_sp_mr_route_key *key,
struct mlxsw_afa_block *afa_block,
enum mlxsw_sp_mr_route_prio prio)
{
struct mlxsw_sp2_mr_route *mr_route = route_priv;
struct mlxsw_sp2_mr_tcam *mr_tcam = priv;
struct mlxsw_sp_acl_ruleset *ruleset;
struct mlxsw_sp_acl_rule *rule;
int err;
mr_route->mr_tcam = mr_tcam;
ruleset = mlxsw_sp2_mr_tcam_proto_ruleset(mr_tcam, key->proto);
if (WARN_ON(!ruleset))
return -EINVAL;
rule = mlxsw_sp_acl_rule_create(mlxsw_sp, ruleset,
(unsigned long) route_priv, afa_block,
NULL);
if (IS_ERR(rule))
return PTR_ERR(rule);
mlxsw_sp2_mr_tcam_rule_parse(rule, key, prio);
err = mlxsw_sp_acl_rule_add(mlxsw_sp, rule);
if (err)
goto err_rule_add;
return 0;
err_rule_add:
mlxsw_sp_acl_rule_destroy(mlxsw_sp, rule);
return err;
}
static void
mlxsw_sp2_mr_tcam_route_destroy(struct mlxsw_sp *mlxsw_sp, void *priv,
void *route_priv,
struct mlxsw_sp_mr_route_key *key)
{
struct mlxsw_sp2_mr_tcam *mr_tcam = priv;
struct mlxsw_sp_acl_ruleset *ruleset;
struct mlxsw_sp_acl_rule *rule;
ruleset = mlxsw_sp2_mr_tcam_proto_ruleset(mr_tcam, key->proto);
if (WARN_ON(!ruleset))
return;
rule = mlxsw_sp_acl_rule_lookup(mlxsw_sp, ruleset,
(unsigned long) route_priv);
if (WARN_ON(!rule))
return;
mlxsw_sp_acl_rule_del(mlxsw_sp, rule);
mlxsw_sp_acl_rule_destroy(mlxsw_sp, rule);
}
static int
mlxsw_sp2_mr_tcam_route_update(struct mlxsw_sp *mlxsw_sp,
void *route_priv,
struct mlxsw_sp_mr_route_key *key,
struct mlxsw_afa_block *afa_block)
{
struct mlxsw_sp2_mr_route *mr_route = route_priv;
struct mlxsw_sp2_mr_tcam *mr_tcam = mr_route->mr_tcam;
struct mlxsw_sp_acl_ruleset *ruleset;
struct mlxsw_sp_acl_rule *rule;
ruleset = mlxsw_sp2_mr_tcam_proto_ruleset(mr_tcam, key->proto);
if (WARN_ON(!ruleset))
return -EINVAL;
rule = mlxsw_sp_acl_rule_lookup(mlxsw_sp, ruleset,
(unsigned long) route_priv);
if (WARN_ON(!rule))
return -EINVAL;
return mlxsw_sp_acl_rule_action_replace(mlxsw_sp, rule, afa_block);
}
static int mlxsw_sp2_mr_tcam_init(struct mlxsw_sp *mlxsw_sp, void *priv)
{
struct mlxsw_sp2_mr_tcam *mr_tcam = priv;
int err;
mr_tcam->mlxsw_sp = mlxsw_sp;
mr_tcam->flow_block = mlxsw_sp_flow_block_create(mlxsw_sp, NULL);
if (!mr_tcam->flow_block)
return -ENOMEM;
err = mlxsw_sp2_mr_tcam_ipv4_init(mr_tcam);
if (err)
goto err_ipv4_init;
err = mlxsw_sp2_mr_tcam_ipv6_init(mr_tcam);
if (err)
goto err_ipv6_init;
return 0;
err_ipv6_init:
mlxsw_sp2_mr_tcam_ipv4_fini(mr_tcam);
err_ipv4_init:
mlxsw_sp_flow_block_destroy(mr_tcam->flow_block);
return err;
}
static void mlxsw_sp2_mr_tcam_fini(void *priv)
{
struct mlxsw_sp2_mr_tcam *mr_tcam = priv;
mlxsw_sp2_mr_tcam_ipv6_fini(mr_tcam);
mlxsw_sp2_mr_tcam_ipv4_fini(mr_tcam);
mlxsw_sp_flow_block_destroy(mr_tcam->flow_block);
}
const struct mlxsw_sp_mr_tcam_ops mlxsw_sp2_mr_tcam_ops = {
.priv_size = sizeof(struct mlxsw_sp2_mr_tcam),
.init = mlxsw_sp2_mr_tcam_init,
.fini = mlxsw_sp2_mr_tcam_fini,
.route_priv_size = sizeof(struct mlxsw_sp2_mr_route),
.route_create = mlxsw_sp2_mr_tcam_route_create,
.route_destroy = mlxsw_sp2_mr_tcam_route_destroy,
.route_update = mlxsw_sp2_mr_tcam_route_update,
};
Reference in New Issue View Git Blame Copy Permalink