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android-kvm / linux / e5d7c1916562f0e856eb3d6f569629fcd535fed2 / . / drivers / net / ethernet / sfc / tc.c
blob: 82e8891a619a201c310a36bf69b6e4a94b2323fc [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/****************************************************************************
* Driver for Solarflare network controllers and boards
* Copyright 2019 Solarflare Communications Inc.
* Copyright 2020-2022 Xilinx Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, incorporated herein by reference.
*/
#include <net/pkt_cls.h>
#include <net/vxlan.h>
#include <net/geneve.h>
#include <net/tc_act/tc_ct.h>
#include "tc.h"
#include "tc_bindings.h"
#include "tc_encap_actions.h"
#include "tc_conntrack.h"
#include "mae.h"
#include "ef100_rep.h"
#include "efx.h"
enum efx_encap_type efx_tc_indr_netdev_type(struct net_device *net_dev)
{
if (netif_is_vxlan(net_dev))
return EFX_ENCAP_TYPE_VXLAN;
if (netif_is_geneve(net_dev))
return EFX_ENCAP_TYPE_GENEVE;
return EFX_ENCAP_TYPE_NONE;
}
#define EFX_TC_HDR_TYPE_TTL_MASK ((u32)0xff)
/* Hoplimit is stored in the most significant byte in the pedit ipv6 header action */
#define EFX_TC_HDR_TYPE_HLIMIT_MASK ~((u32)0xff000000)
#define EFX_EFV_PF NULL
/* Look up the representor information (efv) for a device.
* May return NULL for the PF (us), or an error pointer for a device that
* isn't supported as a TC offload endpoint
*/
struct efx_rep *efx_tc_flower_lookup_efv(struct efx_nic *efx,
struct net_device *dev)
{
struct efx_rep *efv;
if (!dev)
return ERR_PTR(-EOPNOTSUPP);
/* Is it us (the PF)? */
if (dev == efx->net_dev)
return EFX_EFV_PF;
/* Is it an efx vfrep at all? */
if (dev->netdev_ops != &efx_ef100_rep_netdev_ops)
return ERR_PTR(-EOPNOTSUPP);
/* Is it ours? We don't support TC rules that include another
* EF100's netdevices (not even on another port of the same NIC).
*/
efv = netdev_priv(dev);
if (efv->parent != efx)
return ERR_PTR(-EOPNOTSUPP);
return efv;
}
/* Convert a driver-internal vport ID into an internal device (PF or VF) */
static s64 efx_tc_flower_internal_mport(struct efx_nic *efx, struct efx_rep *efv)
{
u32 mport;
if (IS_ERR(efv))
return PTR_ERR(efv);
if (!efv) /* device is PF (us) */
efx_mae_mport_uplink(efx, &mport);
else /* device is repr */
efx_mae_mport_mport(efx, efv->mport, &mport);
return mport;
}
/* Convert a driver-internal vport ID into an external device (wire or VF) */
s64 efx_tc_flower_external_mport(struct efx_nic *efx, struct efx_rep *efv)
{
u32 mport;
if (IS_ERR(efv))
return PTR_ERR(efv);
if (!efv) /* device is PF (us) */
efx_mae_mport_wire(efx, &mport);
else /* device is repr */
efx_mae_mport_mport(efx, efv->mport, &mport);
return mport;
}
static const struct rhashtable_params efx_tc_mac_ht_params = {
.key_len = offsetofend(struct efx_tc_mac_pedit_action, h_addr),
.key_offset = 0,
.head_offset = offsetof(struct efx_tc_mac_pedit_action, linkage),
};
static const struct rhashtable_params efx_tc_encap_match_ht_params = {
.key_len = offsetof(struct efx_tc_encap_match, linkage),
.key_offset = 0,
.head_offset = offsetof(struct efx_tc_encap_match, linkage),
};
static const struct rhashtable_params efx_tc_match_action_ht_params = {
.key_len = sizeof(unsigned long),
.key_offset = offsetof(struct efx_tc_flow_rule, cookie),
.head_offset = offsetof(struct efx_tc_flow_rule, linkage),
};
static const struct rhashtable_params efx_tc_lhs_rule_ht_params = {
.key_len = sizeof(unsigned long),
.key_offset = offsetof(struct efx_tc_lhs_rule, cookie),
.head_offset = offsetof(struct efx_tc_lhs_rule, linkage),
};
static const struct rhashtable_params efx_tc_recirc_ht_params = {
.key_len = offsetof(struct efx_tc_recirc_id, linkage),
.key_offset = 0,
.head_offset = offsetof(struct efx_tc_recirc_id, linkage),
};
static struct efx_tc_mac_pedit_action *efx_tc_flower_get_mac(struct efx_nic *efx,
unsigned char h_addr[ETH_ALEN],
struct netlink_ext_ack *extack)
{
struct efx_tc_mac_pedit_action *ped, *old;
int rc;
ped = kzalloc(sizeof(*ped), GFP_USER);
if (!ped)
return ERR_PTR(-ENOMEM);
memcpy(ped->h_addr, h_addr, ETH_ALEN);
old = rhashtable_lookup_get_insert_fast(&efx->tc->mac_ht,
&ped->linkage,
efx_tc_mac_ht_params);
if (old) {
/* don't need our new entry */
kfree(ped);
if (IS_ERR(old)) /* oh dear, it's actually an error */
return ERR_CAST(old);
if (!refcount_inc_not_zero(&old->ref))
return ERR_PTR(-EAGAIN);
/* existing entry found, ref taken */
return old;
}
rc = efx_mae_allocate_pedit_mac(efx, ped);
if (rc < 0) {
NL_SET_ERR_MSG_MOD(extack, "Failed to store pedit MAC address in hw");
goto out_remove;
}
/* ref and return */
refcount_set(&ped->ref, 1);
return ped;
out_remove:
rhashtable_remove_fast(&efx->tc->mac_ht, &ped->linkage,
efx_tc_mac_ht_params);
kfree(ped);
return ERR_PTR(rc);
}
static void efx_tc_flower_put_mac(struct efx_nic *efx,
struct efx_tc_mac_pedit_action *ped)
{
if (!refcount_dec_and_test(&ped->ref))
return; /* still in use */
rhashtable_remove_fast(&efx->tc->mac_ht, &ped->linkage,
efx_tc_mac_ht_params);
efx_mae_free_pedit_mac(efx, ped);
kfree(ped);
}
static void efx_tc_free_action_set(struct efx_nic *efx,
struct efx_tc_action_set *act, bool in_hw)
{
/* Failure paths calling this on the 'cursor' action set in_hw=false,
* because if the alloc had succeeded we'd've put it in acts.list and
* not still have it in act.
*/
if (in_hw) {
efx_mae_free_action_set(efx, act->fw_id);
/* in_hw is true iff we are on an acts.list; make sure to
* remove ourselves from that list before we are freed.
*/
list_del(&act->list);
}
if (act->count) {
spin_lock_bh(&act->count->cnt->lock);
if (!list_empty(&act->count_user))
list_del(&act->count_user);
spin_unlock_bh(&act->count->cnt->lock);
efx_tc_flower_put_counter_index(efx, act->count);
}
if (act->encap_md) {
list_del(&act->encap_user);
efx_tc_flower_release_encap_md(efx, act->encap_md);
}
if (act->src_mac)
efx_tc_flower_put_mac(efx, act->src_mac);
if (act->dst_mac)
efx_tc_flower_put_mac(efx, act->dst_mac);
kfree(act);
}
static void efx_tc_free_action_set_list(struct efx_nic *efx,
struct efx_tc_action_set_list *acts,
bool in_hw)
{
struct efx_tc_action_set *act, *next;
/* Failure paths set in_hw=false, because usually the acts didn't get
* to efx_mae_alloc_action_set_list(); if they did, the failure tree
* has a separate efx_mae_free_action_set_list() before calling us.
*/
if (in_hw)
efx_mae_free_action_set_list(efx, acts);
/* Any act that's on the list will be in_hw even if the list isn't */
list_for_each_entry_safe(act, next, &acts->list, list)
efx_tc_free_action_set(efx, act, true);
/* Don't kfree, as acts is embedded inside a struct efx_tc_flow_rule */
}
/* Boilerplate for the simple 'copy a field' cases */
#define _MAP_KEY_AND_MASK(_name, _type, _tcget, _tcfield, _field) \
if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_##_name)) { \
struct flow_match_##_type fm; \
\
flow_rule_match_##_tcget(rule, &fm); \
match->value._field = fm.key->_tcfield; \
match->mask._field = fm.mask->_tcfield; \
}
#define MAP_KEY_AND_MASK(_name, _type, _tcfield, _field) \
_MAP_KEY_AND_MASK(_name, _type, _type, _tcfield, _field)
#define MAP_ENC_KEY_AND_MASK(_name, _type, _tcget, _tcfield, _field) \
_MAP_KEY_AND_MASK(ENC_##_name, _type, _tcget, _tcfield, _field)
static int efx_tc_flower_parse_match(struct efx_nic *efx,
struct flow_rule *rule,
struct efx_tc_match *match,
struct netlink_ext_ack *extack)
{
struct flow_dissector *dissector = rule->match.dissector;
unsigned char ipv = 0;
/* Owing to internal TC infelicities, the IPV6_ADDRS key might be set
* even on IPv4 filters; so rather than relying on dissector->used_keys
* we check the addr_type in the CONTROL key. If we don't find it (or
* it's masked, which should never happen), we treat both IPV4_ADDRS
* and IPV6_ADDRS as absent.
*/
if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
struct flow_match_control fm;
flow_rule_match_control(rule, &fm);
if (IS_ALL_ONES(fm.mask->addr_type))
switch (fm.key->addr_type) {
case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
ipv = 4;
break;
case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
ipv = 6;
break;
default:
break;
}
if (fm.mask->flags & FLOW_DIS_IS_FRAGMENT) {
match->value.ip_frag = fm.key->flags & FLOW_DIS_IS_FRAGMENT;
match->mask.ip_frag = true;
}
if (fm.mask->flags & FLOW_DIS_FIRST_FRAG) {
match->value.ip_firstfrag = fm.key->flags & FLOW_DIS_FIRST_FRAG;
match->mask.ip_firstfrag = true;
}
if (fm.mask->flags & ~(FLOW_DIS_IS_FRAGMENT | FLOW_DIS_FIRST_FRAG)) {
NL_SET_ERR_MSG_FMT_MOD(extack, "Unsupported match on control.flags %#x",
fm.mask->flags);
return -EOPNOTSUPP;
}
}
if (dissector->used_keys &
~(BIT_ULL(FLOW_DISSECTOR_KEY_CONTROL) |
BIT_ULL(FLOW_DISSECTOR_KEY_BASIC) |
BIT_ULL(FLOW_DISSECTOR_KEY_ETH_ADDRS) |
BIT_ULL(FLOW_DISSECTOR_KEY_VLAN) |
BIT_ULL(FLOW_DISSECTOR_KEY_CVLAN) |
BIT_ULL(FLOW_DISSECTOR_KEY_IPV4_ADDRS) |
BIT_ULL(FLOW_DISSECTOR_KEY_IPV6_ADDRS) |
BIT_ULL(FLOW_DISSECTOR_KEY_PORTS) |
BIT_ULL(FLOW_DISSECTOR_KEY_ENC_KEYID) |
BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) |
BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) |
BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IP) |
BIT_ULL(FLOW_DISSECTOR_KEY_ENC_PORTS) |
BIT_ULL(FLOW_DISSECTOR_KEY_ENC_CONTROL) |
BIT_ULL(FLOW_DISSECTOR_KEY_CT) |
BIT_ULL(FLOW_DISSECTOR_KEY_TCP) |
BIT_ULL(FLOW_DISSECTOR_KEY_IP))) {
NL_SET_ERR_MSG_FMT_MOD(extack, "Unsupported flower keys %#llx",
dissector->used_keys);
return -EOPNOTSUPP;
}
MAP_KEY_AND_MASK(BASIC, basic, n_proto, eth_proto);
/* Make sure we're IP if any L3/L4 keys used. */
if (!IS_ALL_ONES(match->mask.eth_proto) ||
!(match->value.eth_proto == htons(ETH_P_IP) ||
match->value.eth_proto == htons(ETH_P_IPV6)))
if (dissector->used_keys &
(BIT_ULL(FLOW_DISSECTOR_KEY_IPV4_ADDRS) |
BIT_ULL(FLOW_DISSECTOR_KEY_IPV6_ADDRS) |
BIT_ULL(FLOW_DISSECTOR_KEY_PORTS) |
BIT_ULL(FLOW_DISSECTOR_KEY_IP) |
BIT_ULL(FLOW_DISSECTOR_KEY_TCP))) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"L3/L4 flower keys %#llx require protocol ipv[46]",
dissector->used_keys);
return -EINVAL;
}
if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
struct flow_match_vlan fm;
flow_rule_match_vlan(rule, &fm);
if (fm.mask->vlan_id || fm.mask->vlan_priority || fm.mask->vlan_tpid) {
match->value.vlan_proto[0] = fm.key->vlan_tpid;
match->mask.vlan_proto[0] = fm.mask->vlan_tpid;
match->value.vlan_tci[0] = cpu_to_be16(fm.key->vlan_priority << 13 |
fm.key->vlan_id);
match->mask.vlan_tci[0] = cpu_to_be16(fm.mask->vlan_priority << 13 |
fm.mask->vlan_id);
}
}
if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CVLAN)) {
struct flow_match_vlan fm;
flow_rule_match_cvlan(rule, &fm);
if (fm.mask->vlan_id || fm.mask->vlan_priority || fm.mask->vlan_tpid) {
match->value.vlan_proto[1] = fm.key->vlan_tpid;
match->mask.vlan_proto[1] = fm.mask->vlan_tpid;
match->value.vlan_tci[1] = cpu_to_be16(fm.key->vlan_priority << 13 |
fm.key->vlan_id);
match->mask.vlan_tci[1] = cpu_to_be16(fm.mask->vlan_priority << 13 |
fm.mask->vlan_id);
}
}
if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
struct flow_match_eth_addrs fm;
flow_rule_match_eth_addrs(rule, &fm);
ether_addr_copy(match->value.eth_saddr, fm.key->src);
ether_addr_copy(match->value.eth_daddr, fm.key->dst);
ether_addr_copy(match->mask.eth_saddr, fm.mask->src);
ether_addr_copy(match->mask.eth_daddr, fm.mask->dst);
}
MAP_KEY_AND_MASK(BASIC, basic, ip_proto, ip_proto);
/* Make sure we're TCP/UDP if any L4 keys used. */
if ((match->value.ip_proto != IPPROTO_UDP &&
match->value.ip_proto != IPPROTO_TCP) || !IS_ALL_ONES(match->mask.ip_proto))
if (dissector->used_keys &
(BIT_ULL(FLOW_DISSECTOR_KEY_PORTS) |
BIT_ULL(FLOW_DISSECTOR_KEY_TCP))) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"L4 flower keys %#llx require ipproto udp or tcp",
dissector->used_keys);
return -EINVAL;
}
MAP_KEY_AND_MASK(IP, ip, tos, ip_tos);
MAP_KEY_AND_MASK(IP, ip, ttl, ip_ttl);
if (ipv == 4) {
MAP_KEY_AND_MASK(IPV4_ADDRS, ipv4_addrs, src, src_ip);
MAP_KEY_AND_MASK(IPV4_ADDRS, ipv4_addrs, dst, dst_ip);
}
#ifdef CONFIG_IPV6
else if (ipv == 6) {
MAP_KEY_AND_MASK(IPV6_ADDRS, ipv6_addrs, src, src_ip6);
MAP_KEY_AND_MASK(IPV6_ADDRS, ipv6_addrs, dst, dst_ip6);
}
#endif
MAP_KEY_AND_MASK(PORTS, ports, src, l4_sport);
MAP_KEY_AND_MASK(PORTS, ports, dst, l4_dport);
MAP_KEY_AND_MASK(TCP, tcp, flags, tcp_flags);
if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL)) {
struct flow_match_control fm;
flow_rule_match_enc_control(rule, &fm);
if (fm.mask->flags) {
NL_SET_ERR_MSG_FMT_MOD(extack, "Unsupported match on enc_control.flags %#x",
fm.mask->flags);
return -EOPNOTSUPP;
}
if (!IS_ALL_ONES(fm.mask->addr_type)) {
NL_SET_ERR_MSG_FMT_MOD(extack, "Unsupported enc addr_type mask %u (key %u)",
fm.mask->addr_type,
fm.key->addr_type);
return -EOPNOTSUPP;
}
switch (fm.key->addr_type) {
case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
MAP_ENC_KEY_AND_MASK(IPV4_ADDRS, ipv4_addrs, enc_ipv4_addrs,
src, enc_src_ip);
MAP_ENC_KEY_AND_MASK(IPV4_ADDRS, ipv4_addrs, enc_ipv4_addrs,
dst, enc_dst_ip);
break;
#ifdef CONFIG_IPV6
case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
MAP_ENC_KEY_AND_MASK(IPV6_ADDRS, ipv6_addrs, enc_ipv6_addrs,
src, enc_src_ip6);
MAP_ENC_KEY_AND_MASK(IPV6_ADDRS, ipv6_addrs, enc_ipv6_addrs,
dst, enc_dst_ip6);
break;
#endif
default:
NL_SET_ERR_MSG_FMT_MOD(extack,
"Unsupported enc addr_type %u (supported are IPv4, IPv6)",
fm.key->addr_type);
return -EOPNOTSUPP;
}
MAP_ENC_KEY_AND_MASK(IP, ip, enc_ip, tos, enc_ip_tos);
MAP_ENC_KEY_AND_MASK(IP, ip, enc_ip, ttl, enc_ip_ttl);
MAP_ENC_KEY_AND_MASK(PORTS, ports, enc_ports, src, enc_sport);
MAP_ENC_KEY_AND_MASK(PORTS, ports, enc_ports, dst, enc_dport);
MAP_ENC_KEY_AND_MASK(KEYID, enc_keyid, enc_keyid, keyid, enc_keyid);
} else if (dissector->used_keys &
(BIT_ULL(FLOW_DISSECTOR_KEY_ENC_KEYID) |
BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS) |
BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS) |
BIT_ULL(FLOW_DISSECTOR_KEY_ENC_IP) |
BIT_ULL(FLOW_DISSECTOR_KEY_ENC_PORTS))) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"Flower enc keys require enc_control (keys: %#llx)",
dissector->used_keys);
return -EOPNOTSUPP;
}
if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CT)) {
struct flow_match_ct fm;
flow_rule_match_ct(rule, &fm);
match->value.ct_state_trk = !!(fm.key->ct_state & TCA_FLOWER_KEY_CT_FLAGS_TRACKED);
match->mask.ct_state_trk = !!(fm.mask->ct_state & TCA_FLOWER_KEY_CT_FLAGS_TRACKED);
match->value.ct_state_est = !!(fm.key->ct_state & TCA_FLOWER_KEY_CT_FLAGS_ESTABLISHED);
match->mask.ct_state_est = !!(fm.mask->ct_state & TCA_FLOWER_KEY_CT_FLAGS_ESTABLISHED);
if (fm.mask->ct_state & ~(TCA_FLOWER_KEY_CT_FLAGS_TRACKED |
TCA_FLOWER_KEY_CT_FLAGS_ESTABLISHED)) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"Unsupported ct_state match %#x",
fm.mask->ct_state);
return -EOPNOTSUPP;
}
match->value.ct_mark = fm.key->ct_mark;
match->mask.ct_mark = fm.mask->ct_mark;
match->value.ct_zone = fm.key->ct_zone;
match->mask.ct_zone = fm.mask->ct_zone;
if (memchr_inv(fm.mask->ct_labels, 0, sizeof(fm.mask->ct_labels))) {
NL_SET_ERR_MSG_MOD(extack, "Matching on ct_label not supported");
return -EOPNOTSUPP;
}
}
return 0;
}
static void efx_tc_flower_release_encap_match(struct efx_nic *efx,
struct efx_tc_encap_match *encap)
{
int rc;
if (!refcount_dec_and_test(&encap->ref))
return; /* still in use */
if (encap->type == EFX_TC_EM_DIRECT) {
rc = efx_mae_unregister_encap_match(efx, encap);
if (rc)
/* Display message but carry on and remove entry from our
* SW tables, because there's not much we can do about it.
*/
netif_err(efx, drv, efx->net_dev,
"Failed to release encap match %#x, rc %d\n",
encap->fw_id, rc);
}
rhashtable_remove_fast(&efx->tc->encap_match_ht, &encap->linkage,
efx_tc_encap_match_ht_params);
if (encap->pseudo)
efx_tc_flower_release_encap_match(efx, encap->pseudo);
kfree(encap);
}
static int efx_tc_flower_record_encap_match(struct efx_nic *efx,
struct efx_tc_match *match,
enum efx_encap_type type,
enum efx_tc_em_pseudo_type em_type,
u8 child_ip_tos_mask,
__be16 child_udp_sport_mask,
struct netlink_ext_ack *extack)
{
struct efx_tc_encap_match *encap, *old, *pseudo = NULL;
bool ipv6 = false;
int rc;
/* We require that the socket-defining fields (IP addrs and UDP dest
* port) are present and exact-match. Other fields may only be used
* if the field-set (and any masks) are the same for all encap
* matches on the same <sip,dip,dport> tuple; this is enforced by
* pseudo encap matches.
*/
if (match->mask.enc_dst_ip | match->mask.enc_src_ip) {
if (!IS_ALL_ONES(match->mask.enc_dst_ip)) {
NL_SET_ERR_MSG_MOD(extack,
"Egress encap match is not exact on dst IP address");
return -EOPNOTSUPP;
}
if (!IS_ALL_ONES(match->mask.enc_src_ip)) {
NL_SET_ERR_MSG_MOD(extack,
"Egress encap match is not exact on src IP address");
return -EOPNOTSUPP;
}
#ifdef CONFIG_IPV6
if (!ipv6_addr_any(&match->mask.enc_dst_ip6) ||
!ipv6_addr_any(&match->mask.enc_src_ip6)) {
NL_SET_ERR_MSG_MOD(extack,
"Egress encap match on both IPv4 and IPv6, don't understand");
return -EOPNOTSUPP;
}
} else {
ipv6 = true;
if (!efx_ipv6_addr_all_ones(&match->mask.enc_dst_ip6)) {
NL_SET_ERR_MSG_MOD(extack,
"Egress encap match is not exact on dst IP address");
return -EOPNOTSUPP;
}
if (!efx_ipv6_addr_all_ones(&match->mask.enc_src_ip6)) {
NL_SET_ERR_MSG_MOD(extack,
"Egress encap match is not exact on src IP address");
return -EOPNOTSUPP;
}
#endif
}
if (!IS_ALL_ONES(match->mask.enc_dport)) {
NL_SET_ERR_MSG_MOD(extack, "Egress encap match is not exact on dst UDP port");
return -EOPNOTSUPP;
}
if (match->mask.enc_sport || match->mask.enc_ip_tos) {
struct efx_tc_match pmatch = *match;
if (em_type == EFX_TC_EM_PSEUDO_MASK) { /* can't happen */
NL_SET_ERR_MSG_MOD(extack, "Bad recursion in egress encap match handler");
return -EOPNOTSUPP;
}
pmatch.value.enc_ip_tos = 0;
pmatch.mask.enc_ip_tos = 0;
pmatch.value.enc_sport = 0;
pmatch.mask.enc_sport = 0;
rc = efx_tc_flower_record_encap_match(efx, &pmatch, type,
EFX_TC_EM_PSEUDO_MASK,
match->mask.enc_ip_tos,
match->mask.enc_sport,
extack);
if (rc)
return rc;
pseudo = pmatch.encap;
}
if (match->mask.enc_ip_ttl) {
NL_SET_ERR_MSG_MOD(extack, "Egress encap match on IP TTL not supported");
rc = -EOPNOTSUPP;
goto fail_pseudo;
}
rc = efx_mae_check_encap_match_caps(efx, ipv6, match->mask.enc_ip_tos,
match->mask.enc_sport, extack);
if (rc)
goto fail_pseudo;
encap = kzalloc(sizeof(*encap), GFP_USER);
if (!encap) {
rc = -ENOMEM;
goto fail_pseudo;
}
encap->src_ip = match->value.enc_src_ip;
encap->dst_ip = match->value.enc_dst_ip;
#ifdef CONFIG_IPV6
encap->src_ip6 = match->value.enc_src_ip6;
encap->dst_ip6 = match->value.enc_dst_ip6;
#endif
encap->udp_dport = match->value.enc_dport;
encap->tun_type = type;
encap->ip_tos = match->value.enc_ip_tos;
encap->ip_tos_mask = match->mask.enc_ip_tos;
encap->child_ip_tos_mask = child_ip_tos_mask;
encap->udp_sport = match->value.enc_sport;
encap->udp_sport_mask = match->mask.enc_sport;
encap->child_udp_sport_mask = child_udp_sport_mask;
encap->type = em_type;
encap->pseudo = pseudo;
old = rhashtable_lookup_get_insert_fast(&efx->tc->encap_match_ht,
&encap->linkage,
efx_tc_encap_match_ht_params);
if (old) {
/* don't need our new entry */
kfree(encap);
if (pseudo) /* don't need our new pseudo either */
efx_tc_flower_release_encap_match(efx, pseudo);
if (IS_ERR(old)) /* oh dear, it's actually an error */
return PTR_ERR(old);
/* check old and new em_types are compatible */
switch (old->type) {
case EFX_TC_EM_DIRECT:
/* old EM is in hardware, so mustn't overlap with a
* pseudo, but may be shared with another direct EM
*/
if (em_type == EFX_TC_EM_DIRECT)
break;
NL_SET_ERR_MSG_MOD(extack, "Pseudo encap match conflicts with existing direct entry");
return -EEXIST;
case EFX_TC_EM_PSEUDO_MASK:
/* old EM is protecting a ToS- or src port-qualified
* filter, so may only be shared with another pseudo
* for the same ToS and src port masks.
*/
if (em_type != EFX_TC_EM_PSEUDO_MASK) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"%s encap match conflicts with existing pseudo(MASK) entry",
em_type ? "Pseudo" : "Direct");
return -EEXIST;
}
if (child_ip_tos_mask != old->child_ip_tos_mask) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"Pseudo encap match for TOS mask %#04x conflicts with existing mask %#04x",
child_ip_tos_mask,
old->child_ip_tos_mask);
return -EEXIST;
}
if (child_udp_sport_mask != old->child_udp_sport_mask) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"Pseudo encap match for UDP src port mask %#x conflicts with existing mask %#x",
child_udp_sport_mask,
old->child_udp_sport_mask);
return -EEXIST;
}
break;
case EFX_TC_EM_PSEUDO_OR:
/* old EM corresponds to an OR that has to be unique
* (it must not overlap with any other OR, whether
* direct-EM or pseudo).
*/
NL_SET_ERR_MSG_FMT_MOD(extack,
"%s encap match conflicts with existing pseudo(OR) entry",
em_type ? "Pseudo" : "Direct");
return -EEXIST;
default: /* Unrecognised pseudo-type. Just say no */
NL_SET_ERR_MSG_FMT_MOD(extack,
"%s encap match conflicts with existing pseudo(%d) entry",
em_type ? "Pseudo" : "Direct",
old->type);
return -EEXIST;
}
/* check old and new tun_types are compatible */
if (old->tun_type != type) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"Egress encap match with conflicting tun_type %u != %u",
old->tun_type, type);
return -EEXIST;
}
if (!refcount_inc_not_zero(&old->ref))
return -EAGAIN;
/* existing entry found */
encap = old;
} else {
if (em_type == EFX_TC_EM_DIRECT) {
rc = efx_mae_register_encap_match(efx, encap);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to record egress encap match in HW");
goto fail;
}
}
refcount_set(&encap->ref, 1);
}
match->encap = encap;
return 0;
fail:
rhashtable_remove_fast(&efx->tc->encap_match_ht, &encap->linkage,
efx_tc_encap_match_ht_params);
kfree(encap);
fail_pseudo:
if (pseudo)
efx_tc_flower_release_encap_match(efx, pseudo);
return rc;
}
static struct efx_tc_recirc_id *efx_tc_get_recirc_id(struct efx_nic *efx,
u32 chain_index,
struct net_device *net_dev)
{
struct efx_tc_recirc_id *rid, *old;
int rc;
rid = kzalloc(sizeof(*rid), GFP_USER);
if (!rid)
return ERR_PTR(-ENOMEM);
rid->chain_index = chain_index;
/* We don't take a reference here, because it's implied - if there's
* a rule on the net_dev that's been offloaded to us, then the net_dev
* can't go away until the rule has been deoffloaded.
*/
rid->net_dev = net_dev;
old = rhashtable_lookup_get_insert_fast(&efx->tc->recirc_ht,
&rid->linkage,
efx_tc_recirc_ht_params);
if (old) {
/* don't need our new entry */
kfree(rid);
if (IS_ERR(old)) /* oh dear, it's actually an error */
return ERR_CAST(old);
if (!refcount_inc_not_zero(&old->ref))
return ERR_PTR(-EAGAIN);
/* existing entry found */
rid = old;
} else {
rc = ida_alloc_range(&efx->tc->recirc_ida, 1, U8_MAX, GFP_USER);
if (rc < 0) {
rhashtable_remove_fast(&efx->tc->recirc_ht,
&rid->linkage,
efx_tc_recirc_ht_params);
kfree(rid);
return ERR_PTR(rc);
}
rid->fw_id = rc;
refcount_set(&rid->ref, 1);
}
return rid;
}
static void efx_tc_put_recirc_id(struct efx_nic *efx, struct efx_tc_recirc_id *rid)
{
if (!refcount_dec_and_test(&rid->ref))
return; /* still in use */
rhashtable_remove_fast(&efx->tc->recirc_ht, &rid->linkage,
efx_tc_recirc_ht_params);
ida_free(&efx->tc->recirc_ida, rid->fw_id);
kfree(rid);
}
static void efx_tc_delete_rule(struct efx_nic *efx, struct efx_tc_flow_rule *rule)
{
efx_mae_delete_rule(efx, rule->fw_id);
/* Release entries in subsidiary tables */
efx_tc_free_action_set_list(efx, &rule->acts, true);
if (rule->match.rid)
efx_tc_put_recirc_id(efx, rule->match.rid);
if (rule->match.encap)
efx_tc_flower_release_encap_match(efx, rule->match.encap);
rule->fw_id = MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL;
}
static const char *efx_tc_encap_type_name(enum efx_encap_type typ)
{
switch (typ) {
case EFX_ENCAP_TYPE_NONE:
return "none";
case EFX_ENCAP_TYPE_VXLAN:
return "vxlan";
case EFX_ENCAP_TYPE_GENEVE:
return "geneve";
default:
pr_warn_once("Unknown efx_encap_type %d encountered\n", typ);
return "unknown";
}
}
/* For details of action order constraints refer to SF-123102-TC-1§12.6.1 */
enum efx_tc_action_order {
EFX_TC_AO_DECAP,
EFX_TC_AO_DEC_TTL,
EFX_TC_AO_PEDIT_MAC_ADDRS,
EFX_TC_AO_VLAN_POP,
EFX_TC_AO_VLAN_PUSH,
EFX_TC_AO_COUNT,
EFX_TC_AO_ENCAP,
EFX_TC_AO_DELIVER
};
/* Determine whether we can add @new action without violating order */
static bool efx_tc_flower_action_order_ok(const struct efx_tc_action_set *act,
enum efx_tc_action_order new)
{
switch (new) {
case EFX_TC_AO_DECAP:
if (act->decap)
return false;
/* PEDIT_MAC_ADDRS must not happen before DECAP, though it
* can wait until much later
*/
if (act->dst_mac || act->src_mac)
return false;
/* Decrementing ttl must not happen before DECAP */
if (act->do_ttl_dec)
return false;
fallthrough;
case EFX_TC_AO_VLAN_POP:
if (act->vlan_pop >= 2)
return false;
/* If we've already pushed a VLAN, we can't then pop it;
* the hardware would instead try to pop an existing VLAN
* before pushing the new one.
*/
if (act->vlan_push)
return false;
fallthrough;
case EFX_TC_AO_VLAN_PUSH:
if (act->vlan_push >= 2)
return false;
fallthrough;
case EFX_TC_AO_COUNT:
if (act->count)
return false;
fallthrough;
case EFX_TC_AO_PEDIT_MAC_ADDRS:
case EFX_TC_AO_ENCAP:
if (act->encap_md)
return false;
fallthrough;
case EFX_TC_AO_DELIVER:
return !act->deliver;
case EFX_TC_AO_DEC_TTL:
if (act->encap_md)
return false;
return !act->do_ttl_dec;
default:
/* Bad caller. Whatever they wanted to do, say they can't. */
WARN_ON_ONCE(1);
return false;
}
}
/**
* DOC: TC conntrack sequences
*
* The MAE hardware can handle at most two rounds of action rule matching,
* consequently we support conntrack through the notion of a "left-hand side
* rule". This is a rule which typically contains only the actions "ct" and
* "goto chain N", and corresponds to one or more "right-hand side rules" in
* chain N, which typically match on +trk+est, and may perform ct(nat) actions.
* RHS rules go in the Action Rule table as normal but with a nonzero recirc_id
* (the hardware equivalent of chain_index), while LHS rules may go in either
* the Action Rule or the Outer Rule table, the latter being preferred for
* performance reasons, and set both DO_CT and a recirc_id in their response.
*
* Besides the RHS rules, there are often also similar rules matching on
* +trk+new which perform the ct(commit) action. These are not offloaded.
*/
static bool efx_tc_rule_is_lhs_rule(struct flow_rule *fr,
struct efx_tc_match *match)
{
const struct flow_action_entry *fa;
int i;
flow_action_for_each(i, fa, &fr->action) {
switch (fa->id) {
case FLOW_ACTION_GOTO:
return true;
case FLOW_ACTION_CT:
/* If rule is -trk, or doesn't mention trk at all, then
* a CT action implies a conntrack lookup (hence it's an
* LHS rule). If rule is +trk, then a CT action could
* just be ct(nat) or even ct(commit) (though the latter
* can't be offloaded).
*/
if (!match->mask.ct_state_trk || !match->value.ct_state_trk)
return true;
break;
default:
break;
}
}
return false;
}
/* A foreign LHS rule has matches on enc_ keys at the TC layer (including an
* implied match on enc_ip_proto UDP). Translate these into non-enc_ keys,
* so that we can use the same MAE machinery as local LHS rules (and so that
* the lhs_rules entries have uniform semantics). It may seem odd to do it
* this way round, given that the corresponding fields in the MAE MCDIs are
* all ENC_, but (a) we don't have enc_L2 or enc_ip_proto in struct
* efx_tc_match_fields and (b) semantically an LHS rule doesn't have inner
* fields so it's just matching on *the* header rather than the outer header.
* Make sure that the non-enc_ keys were not already being matched on, as that
* would imply a rule that needed a triple lookup. (Hardware can do that,
* with OR-AR-CT-AR, but it halves packet rate so we avoid it where possible;
* see efx_tc_flower_flhs_needs_ar().)
*/
static int efx_tc_flower_translate_flhs_match(struct efx_tc_match *match)
{
int rc = 0;
#define COPY_MASK_AND_VALUE(_key, _ekey) ({ \
if (match->mask._key) { \
rc = -EOPNOTSUPP; \
} else { \
match->mask._key = match->mask._ekey; \
match->mask._ekey = 0; \
match->value._key = match->value._ekey; \
match->value._ekey = 0; \
} \
rc; \
})
#define COPY_FROM_ENC(_key) COPY_MASK_AND_VALUE(_key, enc_##_key)
if (match->mask.ip_proto)
return -EOPNOTSUPP;
match->mask.ip_proto = ~0;
match->value.ip_proto = IPPROTO_UDP;
if (COPY_FROM_ENC(src_ip) || COPY_FROM_ENC(dst_ip))
return rc;
#ifdef CONFIG_IPV6
if (!ipv6_addr_any(&match->mask.src_ip6))
return -EOPNOTSUPP;
match->mask.src_ip6 = match->mask.enc_src_ip6;
memset(&match->mask.enc_src_ip6, 0, sizeof(struct in6_addr));
if (!ipv6_addr_any(&match->mask.dst_ip6))
return -EOPNOTSUPP;
match->mask.dst_ip6 = match->mask.enc_dst_ip6;
memset(&match->mask.enc_dst_ip6, 0, sizeof(struct in6_addr));
#endif
if (COPY_FROM_ENC(ip_tos) || COPY_FROM_ENC(ip_ttl))
return rc;
/* should really copy enc_ip_frag but we don't have that in
* parse_match yet
*/
if (COPY_MASK_AND_VALUE(l4_sport, enc_sport) ||
COPY_MASK_AND_VALUE(l4_dport, enc_dport))
return rc;
return 0;
#undef COPY_FROM_ENC
#undef COPY_MASK_AND_VALUE
}
/* If a foreign LHS rule wants to match on keys that are only available after
* encap header identification and parsing, then it can't be done in the Outer
* Rule lookup, because that lookup determines the encap type used to parse
* beyond the outer headers. Thus, such rules must use the OR-AR-CT-AR lookup
* sequence, with an EM (struct efx_tc_encap_match) in the OR step.
* Return true iff the passed match requires this.
*/
static bool efx_tc_flower_flhs_needs_ar(struct efx_tc_match *match)
{
/* matches on inner-header keys can't be done in OR */
return match->mask.eth_proto ||
match->mask.vlan_tci[0] || match->mask.vlan_tci[1] ||
match->mask.vlan_proto[0] || match->mask.vlan_proto[1] ||
memchr_inv(match->mask.eth_saddr, 0, ETH_ALEN) ||
memchr_inv(match->mask.eth_daddr, 0, ETH_ALEN) ||
match->mask.ip_proto ||
match->mask.ip_tos || match->mask.ip_ttl ||
match->mask.src_ip || match->mask.dst_ip ||
#ifdef CONFIG_IPV6
!ipv6_addr_any(&match->mask.src_ip6) ||
!ipv6_addr_any(&match->mask.dst_ip6) ||
#endif
match->mask.ip_frag || match->mask.ip_firstfrag ||
match->mask.l4_sport || match->mask.l4_dport ||
match->mask.tcp_flags ||
/* nor can VNI */
match->mask.enc_keyid;
}
static int efx_tc_flower_handle_lhs_actions(struct efx_nic *efx,
struct flow_cls_offload *tc,
struct flow_rule *fr,
struct net_device *net_dev,
struct efx_tc_lhs_rule *rule)
{
struct netlink_ext_ack *extack = tc->common.extack;
struct efx_tc_lhs_action *act = &rule->lhs_act;
const struct flow_action_entry *fa;
enum efx_tc_counter_type ctype;
bool pipe = true;
int i;
ctype = rule->is_ar ? EFX_TC_COUNTER_TYPE_AR : EFX_TC_COUNTER_TYPE_OR;
flow_action_for_each(i, fa, &fr->action) {
struct efx_tc_ct_zone *ct_zone;
struct efx_tc_recirc_id *rid;
if (!pipe) {
/* more actions after a non-pipe action */
NL_SET_ERR_MSG_MOD(extack, "Action follows non-pipe action");
return -EINVAL;
}
switch (fa->id) {
case FLOW_ACTION_GOTO:
if (!fa->chain_index) {
NL_SET_ERR_MSG_MOD(extack, "Can't goto chain 0, no looping in hw");
return -EOPNOTSUPP;
}
rid = efx_tc_get_recirc_id(efx, fa->chain_index,
net_dev);
if (IS_ERR(rid)) {
NL_SET_ERR_MSG_MOD(extack, "Failed to allocate a hardware recirculation ID for this chain_index");
return PTR_ERR(rid);
}
act->rid = rid;
if (fa->hw_stats) {
struct efx_tc_counter_index *cnt;
if (!(fa->hw_stats & FLOW_ACTION_HW_STATS_DELAYED)) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"hw_stats_type %u not supported (only 'delayed')",
fa->hw_stats);
return -EOPNOTSUPP;
}
cnt = efx_tc_flower_get_counter_index(efx, tc->cookie,
ctype);
if (IS_ERR(cnt)) {
NL_SET_ERR_MSG_MOD(extack, "Failed to obtain a counter");
return PTR_ERR(cnt);
}
WARN_ON(act->count); /* can't happen */
act->count = cnt;
}
pipe = false;
break;
case FLOW_ACTION_CT:
if (act->zone) {
NL_SET_ERR_MSG_MOD(extack, "Can't offload multiple ct actions");
return -EOPNOTSUPP;
}
if (fa->ct.action & (TCA_CT_ACT_COMMIT |
TCA_CT_ACT_FORCE)) {
NL_SET_ERR_MSG_MOD(extack, "Can't offload ct commit/force");
return -EOPNOTSUPP;
}
if (fa->ct.action & TCA_CT_ACT_CLEAR) {
NL_SET_ERR_MSG_MOD(extack, "Can't clear ct in LHS rule");
return -EOPNOTSUPP;
}
if (fa->ct.action & (TCA_CT_ACT_NAT |
TCA_CT_ACT_NAT_SRC |
TCA_CT_ACT_NAT_DST)) {
NL_SET_ERR_MSG_MOD(extack, "Can't perform NAT in LHS rule - packet isn't conntracked yet");
return -EOPNOTSUPP;
}
if (fa->ct.action) {
NL_SET_ERR_MSG_FMT_MOD(extack, "Unhandled ct.action %u for LHS rule\n",
fa->ct.action);
return -EOPNOTSUPP;
}
ct_zone = efx_tc_ct_register_zone(efx, fa->ct.zone,
fa->ct.flow_table);
if (IS_ERR(ct_zone)) {
NL_SET_ERR_MSG_MOD(extack, "Failed to register for CT updates");
return PTR_ERR(ct_zone);
}
act->zone = ct_zone;
break;
default:
NL_SET_ERR_MSG_FMT_MOD(extack, "Unhandled action %u for LHS rule\n",
fa->id);
return -EOPNOTSUPP;
}
}
if (pipe) {
NL_SET_ERR_MSG_MOD(extack, "Missing goto chain in LHS rule");
return -EOPNOTSUPP;
}
return 0;
}
static void efx_tc_flower_release_lhs_actions(struct efx_nic *efx,
struct efx_tc_lhs_action *act)
{
if (act->rid)
efx_tc_put_recirc_id(efx, act->rid);
if (act->zone)
efx_tc_ct_unregister_zone(efx, act->zone);
if (act->count)
efx_tc_flower_put_counter_index(efx, act->count);
}
/**
* struct efx_tc_mangler_state - accumulates 32-bit pedits into fields
*
* @dst_mac_32: dst_mac[0:3] has been populated
* @dst_mac_16: dst_mac[4:5] has been populated
* @src_mac_16: src_mac[0:1] has been populated
* @src_mac_32: src_mac[2:5] has been populated
* @dst_mac: h_dest field of ethhdr
* @src_mac: h_source field of ethhdr
*
* Since FLOW_ACTION_MANGLE comes in 32-bit chunks that do not
* necessarily equate to whole fields of the packet header, this
* structure is used to hold the cumulative effect of the partial
* field pedits that have been processed so far.
*/
struct efx_tc_mangler_state {
u8 dst_mac_32:1; /* eth->h_dest[0:3] */
u8 dst_mac_16:1; /* eth->h_dest[4:5] */
u8 src_mac_16:1; /* eth->h_source[0:1] */
u8 src_mac_32:1; /* eth->h_source[2:5] */
unsigned char dst_mac[ETH_ALEN];
unsigned char src_mac[ETH_ALEN];
};
/** efx_tc_complete_mac_mangle() - pull complete field pedits out of @mung
* @efx: NIC we're installing a flow rule on
* @act: action set (cursor) to update
* @mung: accumulated partial mangles
* @extack: netlink extended ack for reporting errors
*
* Check @mung to find any combinations of partial mangles that can be
* combined into a complete packet field edit, add that edit to @act,
* and consume the partial mangles from @mung.
*/
static int efx_tc_complete_mac_mangle(struct efx_nic *efx,
struct efx_tc_action_set *act,
struct efx_tc_mangler_state *mung,
struct netlink_ext_ack *extack)
{
struct efx_tc_mac_pedit_action *ped;
if (mung->dst_mac_32 && mung->dst_mac_16) {
ped = efx_tc_flower_get_mac(efx, mung->dst_mac, extack);
if (IS_ERR(ped))
return PTR_ERR(ped);
/* Check that we have not already populated dst_mac */
if (act->dst_mac)
efx_tc_flower_put_mac(efx, act->dst_mac);
act->dst_mac = ped;
/* consume the incomplete state */
mung->dst_mac_32 = 0;
mung->dst_mac_16 = 0;
}
if (mung->src_mac_16 && mung->src_mac_32) {
ped = efx_tc_flower_get_mac(efx, mung->src_mac, extack);
if (IS_ERR(ped))
return PTR_ERR(ped);
/* Check that we have not already populated src_mac */
if (act->src_mac)
efx_tc_flower_put_mac(efx, act->src_mac);
act->src_mac = ped;
/* consume the incomplete state */
mung->src_mac_32 = 0;
mung->src_mac_16 = 0;
}
return 0;
}
static int efx_tc_pedit_add(struct efx_nic *efx, struct efx_tc_action_set *act,
const struct flow_action_entry *fa,
struct netlink_ext_ack *extack)
{
switch (fa->mangle.htype) {
case FLOW_ACT_MANGLE_HDR_TYPE_IP4:
switch (fa->mangle.offset) {
case offsetof(struct iphdr, ttl):
/* check that pedit applies to ttl only */
if (fa->mangle.mask != ~EFX_TC_HDR_TYPE_TTL_MASK)
break;
/* Adding 0xff is equivalent to decrementing the ttl.
* Other added values are not supported.
*/
if ((fa->mangle.val & EFX_TC_HDR_TYPE_TTL_MASK) != U8_MAX)
break;
/* check that we do not decrement ttl twice */
if (!efx_tc_flower_action_order_ok(act,
EFX_TC_AO_DEC_TTL)) {
NL_SET_ERR_MSG_MOD(extack, "multiple dec ttl are not supported");
return -EOPNOTSUPP;
}
act->do_ttl_dec = 1;
return 0;
default:
break;
}
break;
case FLOW_ACT_MANGLE_HDR_TYPE_IP6:
switch (fa->mangle.offset) {
case round_down(offsetof(struct ipv6hdr, hop_limit), 4):
/* check that pedit applies to hoplimit only */
if (fa->mangle.mask != EFX_TC_HDR_TYPE_HLIMIT_MASK)
break;
/* Adding 0xff is equivalent to decrementing the hoplimit.
* Other added values are not supported.
*/
if ((fa->mangle.val >> 24) != U8_MAX)
break;
/* check that we do not decrement hoplimit twice */
if (!efx_tc_flower_action_order_ok(act,
EFX_TC_AO_DEC_TTL)) {
NL_SET_ERR_MSG_MOD(extack, "multiple dec ttl are not supported");
return -EOPNOTSUPP;
}
act->do_ttl_dec = 1;
return 0;
default:
break;
}
break;
default:
break;
}
NL_SET_ERR_MSG_FMT_MOD(extack,
"ttl add action type %x %x %x/%x is not supported",
fa->mangle.htype, fa->mangle.offset,
fa->mangle.val, fa->mangle.mask);
return -EOPNOTSUPP;
}
/**
* efx_tc_mangle() - handle a single 32-bit (or less) pedit
* @efx: NIC we're installing a flow rule on
* @act: action set (cursor) to update
* @fa: FLOW_ACTION_MANGLE action metadata
* @mung: accumulator for partial mangles
* @extack: netlink extended ack for reporting errors
* @match: original match used along with the mangle action
*
* Identify the fields written by a FLOW_ACTION_MANGLE, and record
* the partial mangle state in @mung. If this mangle completes an
* earlier partial mangle, consume and apply to @act by calling
* efx_tc_complete_mac_mangle().
*/
static int efx_tc_mangle(struct efx_nic *efx, struct efx_tc_action_set *act,
const struct flow_action_entry *fa,
struct efx_tc_mangler_state *mung,
struct netlink_ext_ack *extack,
struct efx_tc_match *match)
{
__le32 mac32;
__le16 mac16;
u8 tr_ttl;
switch (fa->mangle.htype) {
case FLOW_ACT_MANGLE_HDR_TYPE_ETH:
BUILD_BUG_ON(offsetof(struct ethhdr, h_dest) != 0);
BUILD_BUG_ON(offsetof(struct ethhdr, h_source) != 6);
if (!efx_tc_flower_action_order_ok(act, EFX_TC_AO_PEDIT_MAC_ADDRS)) {
NL_SET_ERR_MSG_MOD(extack,
"Pedit mangle mac action violates action order");
return -EOPNOTSUPP;
}
switch (fa->mangle.offset) {
case 0:
if (fa->mangle.mask) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"mask (%#x) of eth.dst32 mangle is not supported",
fa->mangle.mask);
return -EOPNOTSUPP;
}
/* Ethernet address is little-endian */
mac32 = cpu_to_le32(fa->mangle.val);
memcpy(mung->dst_mac, &mac32, sizeof(mac32));
mung->dst_mac_32 = 1;
return efx_tc_complete_mac_mangle(efx, act, mung, extack);
case 4:
if (fa->mangle.mask == 0xffff) {
mac16 = cpu_to_le16(fa->mangle.val >> 16);
memcpy(mung->src_mac, &mac16, sizeof(mac16));
mung->src_mac_16 = 1;
} else if (fa->mangle.mask == 0xffff0000) {
mac16 = cpu_to_le16((u16)fa->mangle.val);
memcpy(mung->dst_mac + 4, &mac16, sizeof(mac16));
mung->dst_mac_16 = 1;
} else {
NL_SET_ERR_MSG_FMT_MOD(extack,
"mask (%#x) of eth+4 mangle is not high or low 16b",
fa->mangle.mask);
return -EOPNOTSUPP;
}
return efx_tc_complete_mac_mangle(efx, act, mung, extack);
case 8:
if (fa->mangle.mask) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"mask (%#x) of eth.src32 mangle is not supported",
fa->mangle.mask);
return -EOPNOTSUPP;
}
mac32 = cpu_to_le32(fa->mangle.val);
memcpy(mung->src_mac + 2, &mac32, sizeof(mac32));
mung->src_mac_32 = 1;
return efx_tc_complete_mac_mangle(efx, act, mung, extack);
default:
NL_SET_ERR_MSG_FMT_MOD(extack, "mangle eth+%u %x/%x is not supported",
fa->mangle.offset, fa->mangle.val, fa->mangle.mask);
return -EOPNOTSUPP;
}
break;
case FLOW_ACT_MANGLE_HDR_TYPE_IP4:
switch (fa->mangle.offset) {
case offsetof(struct iphdr, ttl):
/* we currently only support pedit IP4 when it applies
* to TTL and then only when it can be achieved with a
* decrement ttl action
*/
/* check that pedit applies to ttl only */
if (fa->mangle.mask != ~EFX_TC_HDR_TYPE_TTL_MASK) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"mask (%#x) out of range, only support mangle action on ipv4.ttl",
fa->mangle.mask);
return -EOPNOTSUPP;
}
/* we can only convert to a dec ttl when we have an
* exact match on the ttl field
*/
if (match->mask.ip_ttl != U8_MAX) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"only support mangle ttl when we have an exact match, current mask (%#x)",
match->mask.ip_ttl);
return -EOPNOTSUPP;
}
/* check that we don't try to decrement 0, which equates
* to setting the ttl to 0xff
*/
if (match->value.ip_ttl == 0) {
NL_SET_ERR_MSG_MOD(extack,
"decrement ttl past 0 is not supported");
return -EOPNOTSUPP;
}
/* check that we do not decrement ttl twice */
if (!efx_tc_flower_action_order_ok(act,
EFX_TC_AO_DEC_TTL)) {
NL_SET_ERR_MSG_MOD(extack,
"multiple dec ttl is not supported");
return -EOPNOTSUPP;
}
/* check pedit can be achieved with decrement action */
tr_ttl = match->value.ip_ttl - 1;
if ((fa->mangle.val & EFX_TC_HDR_TYPE_TTL_MASK) == tr_ttl) {
act->do_ttl_dec = 1;
return 0;
}
fallthrough;
default:
NL_SET_ERR_MSG_FMT_MOD(extack,
"only support mangle on the ttl field (offset is %u)",
fa->mangle.offset);
return -EOPNOTSUPP;
}
break;
case FLOW_ACT_MANGLE_HDR_TYPE_IP6:
switch (fa->mangle.offset) {
case round_down(offsetof(struct ipv6hdr, hop_limit), 4):
/* we currently only support pedit IP6 when it applies
* to the hoplimit and then only when it can be achieved
* with a decrement hoplimit action
*/
/* check that pedit applies to ttl only */
if (fa->mangle.mask != EFX_TC_HDR_TYPE_HLIMIT_MASK) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"mask (%#x) out of range, only support mangle action on ipv6.hop_limit",
fa->mangle.mask);
return -EOPNOTSUPP;
}
/* we can only convert to a dec ttl when we have an
* exact match on the ttl field
*/
if (match->mask.ip_ttl != U8_MAX) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"only support hop_limit when we have an exact match, current mask (%#x)",
match->mask.ip_ttl);
return -EOPNOTSUPP;
}
/* check that we don't try to decrement 0, which equates
* to setting the ttl to 0xff
*/
if (match->value.ip_ttl == 0) {
NL_SET_ERR_MSG_MOD(extack,
"decrementing hop_limit past 0 is not supported");
return -EOPNOTSUPP;
}
/* check that we do not decrement hoplimit twice */
if (!efx_tc_flower_action_order_ok(act,
EFX_TC_AO_DEC_TTL)) {
NL_SET_ERR_MSG_MOD(extack,
"multiple dec ttl is not supported");
return -EOPNOTSUPP;
}
/* check pedit can be achieved with decrement action */
tr_ttl = match->value.ip_ttl - 1;
if ((fa->mangle.val >> 24) == tr_ttl) {
act->do_ttl_dec = 1;
return 0;
}
fallthrough;
default:
NL_SET_ERR_MSG_FMT_MOD(extack,
"only support mangle on the hop_limit field");
return -EOPNOTSUPP;
}
default:
NL_SET_ERR_MSG_FMT_MOD(extack, "Unhandled mangle htype %u for action rule",
fa->mangle.htype);
return -EOPNOTSUPP;
}
return 0;
}
/**
* efx_tc_incomplete_mangle() - check for leftover partial pedits
* @mung: accumulator for partial mangles
* @extack: netlink extended ack for reporting errors
*
* Since the MAE can only overwrite whole fields, any partial
* field mangle left over on reaching packet delivery (mirred or
* end of TC actions) cannot be offloaded. Check for any such
* and reject them with -%EOPNOTSUPP.
*/
static int efx_tc_incomplete_mangle(struct efx_tc_mangler_state *mung,
struct netlink_ext_ack *extack)
{
if (mung->dst_mac_32 || mung->dst_mac_16) {
NL_SET_ERR_MSG_MOD(extack, "Incomplete pedit of destination MAC address");
return -EOPNOTSUPP;
}
if (mung->src_mac_16 || mung->src_mac_32) {
NL_SET_ERR_MSG_MOD(extack, "Incomplete pedit of source MAC address");
return -EOPNOTSUPP;
}
return 0;
}
static int efx_tc_flower_replace_foreign_lhs_ar(struct efx_nic *efx,
struct flow_cls_offload *tc,
struct flow_rule *fr,
struct efx_tc_match *match,
struct net_device *net_dev)
{
struct netlink_ext_ack *extack = tc->common.extack;
struct efx_tc_lhs_rule *rule, *old;
enum efx_encap_type type;
int rc;
type = efx_tc_indr_netdev_type(net_dev);
if (type == EFX_ENCAP_TYPE_NONE) {
NL_SET_ERR_MSG_MOD(extack, "Egress encap match on unsupported tunnel device");
return -EOPNOTSUPP;
}
rc = efx_mae_check_encap_type_supported(efx, type);
if (rc) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"Firmware reports no support for %s encap match",
efx_tc_encap_type_name(type));
return rc;
}
/* This is an Action Rule, so it needs a separate Encap Match in the
* Outer Rule table. Insert that now.
*/
rc = efx_tc_flower_record_encap_match(efx, match, type,
EFX_TC_EM_DIRECT, 0, 0, extack);
if (rc)
return rc;
match->mask.recirc_id = 0xff;
if (match->mask.ct_state_trk && match->value.ct_state_trk) {
NL_SET_ERR_MSG_MOD(extack, "LHS rule can never match +trk");
rc = -EOPNOTSUPP;
goto release_encap_match;
}
/* LHS rules are always -trk, so we don't need to match on that */
match->mask.ct_state_trk = 0;
match->value.ct_state_trk = 0;
/* We must inhibit match on TCP SYN/FIN/RST, so that SW can see
* the packet and update the conntrack table.
* Outer Rules will do that with CT_TCP_FLAGS_INHIBIT, but Action
* Rules don't have that; instead they support matching on
* TCP_SYN_FIN_RST (aka TCP_INTERESTING_FLAGS), so use that.
* This is only strictly needed if there will be a DO_CT action,
* which we don't know yet, but typically there will be and it's
* simpler not to bother checking here.
*/
match->mask.tcp_syn_fin_rst = true;
rc = efx_mae_match_check_caps(efx, &match->mask, extack);
if (rc)
goto release_encap_match;
rule = kzalloc(sizeof(*rule), GFP_USER);
if (!rule) {
rc = -ENOMEM;
goto release_encap_match;
}
rule->cookie = tc->cookie;
rule->is_ar = true;
old = rhashtable_lookup_get_insert_fast(&efx->tc->lhs_rule_ht,
&rule->linkage,
efx_tc_lhs_rule_ht_params);
if (old) {
netif_dbg(efx, drv, efx->net_dev,
"Already offloaded rule (cookie %lx)\n", tc->cookie);
rc = -EEXIST;
NL_SET_ERR_MSG_MOD(extack, "Rule already offloaded");
goto release;
}
/* Parse actions */
rc = efx_tc_flower_handle_lhs_actions(efx, tc, fr, net_dev, rule);
if (rc)
goto release;
rule->match = *match;
rule->lhs_act.tun_type = type;
rc = efx_mae_insert_lhs_rule(efx, rule, EFX_TC_PRIO_TC);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to insert rule in hw");
goto release;
}
netif_dbg(efx, drv, efx->net_dev,
"Successfully parsed lhs rule (cookie %lx)\n",
tc->cookie);
return 0;
release:
efx_tc_flower_release_lhs_actions(efx, &rule->lhs_act);
if (!old)
rhashtable_remove_fast(&efx->tc->lhs_rule_ht, &rule->linkage,
efx_tc_lhs_rule_ht_params);
kfree(rule);
release_encap_match:
if (match->encap)
efx_tc_flower_release_encap_match(efx, match->encap);
return rc;
}
static int efx_tc_flower_replace_foreign_lhs(struct efx_nic *efx,
struct flow_cls_offload *tc,
struct flow_rule *fr,
struct efx_tc_match *match,
struct net_device *net_dev)
{
struct netlink_ext_ack *extack = tc->common.extack;
struct efx_tc_lhs_rule *rule, *old;
enum efx_encap_type type;
int rc;
if (tc->common.chain_index) {
NL_SET_ERR_MSG_MOD(extack, "LHS rule only allowed in chain 0");
return -EOPNOTSUPP;
}
if (!efx_tc_match_is_encap(&match->mask)) {
/* This is not a tunnel decap rule, ignore it */
netif_dbg(efx, drv, efx->net_dev, "Ignoring foreign LHS filter without encap match\n");
return -EOPNOTSUPP;
}
if (efx_tc_flower_flhs_needs_ar(match))
return efx_tc_flower_replace_foreign_lhs_ar(efx, tc, fr, match,
net_dev);
type = efx_tc_indr_netdev_type(net_dev);
if (type == EFX_ENCAP_TYPE_NONE) {
NL_SET_ERR_MSG_MOD(extack, "Egress encap match on unsupported tunnel device\n");
return -EOPNOTSUPP;
}
rc = efx_mae_check_encap_type_supported(efx, type);
if (rc) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"Firmware reports no support for %s encap match",
efx_tc_encap_type_name(type));
return rc;
}
/* Reserve the outer tuple with a pseudo Encap Match */
rc = efx_tc_flower_record_encap_match(efx, match, type,
EFX_TC_EM_PSEUDO_OR, 0, 0,
extack);
if (rc)
return rc;
if (match->mask.ct_state_trk && match->value.ct_state_trk) {
NL_SET_ERR_MSG_MOD(extack, "LHS rule can never match +trk");
rc = -EOPNOTSUPP;
goto release_encap_match;
}
/* LHS rules are always -trk, so we don't need to match on that */
match->mask.ct_state_trk = 0;
match->value.ct_state_trk = 0;
rc = efx_tc_flower_translate_flhs_match(match);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "LHS rule cannot match on inner fields");
goto release_encap_match;
}
rc = efx_mae_match_check_caps_lhs(efx, &match->mask, extack);
if (rc)
goto release_encap_match;
rule = kzalloc(sizeof(*rule), GFP_USER);
if (!rule) {
rc = -ENOMEM;
goto release_encap_match;
}
rule->cookie = tc->cookie;
old = rhashtable_lookup_get_insert_fast(&efx->tc->lhs_rule_ht,
&rule->linkage,
efx_tc_lhs_rule_ht_params);
if (old) {
netif_dbg(efx, drv, efx->net_dev,
"Already offloaded rule (cookie %lx)\n", tc->cookie);
rc = -EEXIST;
NL_SET_ERR_MSG_MOD(extack, "Rule already offloaded");
goto release;
}
/* Parse actions */
rc = efx_tc_flower_handle_lhs_actions(efx, tc, fr, net_dev, rule);
if (rc)
goto release;
rule->match = *match;
rule->lhs_act.tun_type = type;
rc = efx_mae_insert_lhs_rule(efx, rule, EFX_TC_PRIO_TC);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to insert rule in hw");
goto release;
}
netif_dbg(efx, drv, efx->net_dev,
"Successfully parsed lhs rule (cookie %lx)\n",
tc->cookie);
return 0;
release:
efx_tc_flower_release_lhs_actions(efx, &rule->lhs_act);
if (!old)
rhashtable_remove_fast(&efx->tc->lhs_rule_ht, &rule->linkage,
efx_tc_lhs_rule_ht_params);
kfree(rule);
release_encap_match:
if (match->encap)
efx_tc_flower_release_encap_match(efx, match->encap);
return rc;
}
static int efx_tc_flower_replace_foreign(struct efx_nic *efx,
struct net_device *net_dev,
struct flow_cls_offload *tc)
{
struct flow_rule *fr = flow_cls_offload_flow_rule(tc);
struct netlink_ext_ack *extack = tc->common.extack;
struct efx_tc_flow_rule *rule = NULL, *old = NULL;
struct efx_tc_action_set *act = NULL;
bool found = false, uplinked = false;
const struct flow_action_entry *fa;
struct efx_tc_match match;
struct efx_rep *to_efv;
s64 rc;
int i;
/* Parse match */
memset(&match, 0, sizeof(match));
rc = efx_tc_flower_parse_match(efx, fr, &match, extack);
if (rc)
return rc;
/* The rule as given to us doesn't specify a source netdevice.
* But, determining whether packets from a VF should match it is
* complicated, so leave those to the software slowpath: qualify
* the filter with source m-port == wire.
*/
rc = efx_tc_flower_external_mport(efx, EFX_EFV_PF);
if (rc < 0) {
NL_SET_ERR_MSG_MOD(extack, "Failed to identify ingress m-port for foreign filter");
return rc;
}
match.value.ingress_port = rc;
match.mask.ingress_port = ~0;
if (efx_tc_rule_is_lhs_rule(fr, &match))
return efx_tc_flower_replace_foreign_lhs(efx, tc, fr, &match,
net_dev);
if (tc->common.chain_index) {
struct efx_tc_recirc_id *rid;
rid = efx_tc_get_recirc_id(efx, tc->common.chain_index, net_dev);
if (IS_ERR(rid)) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"Failed to allocate a hardware recirculation ID for chain_index %u",
tc->common.chain_index);
return PTR_ERR(rid);
}
match.rid = rid;
match.value.recirc_id = rid->fw_id;
}
match.mask.recirc_id = 0xff;
/* AR table can't match on DO_CT (+trk). But a commonly used pattern is
* +trk+est, which is strictly implied by +est, so rewrite it to that.
*/
if (match.mask.ct_state_trk && match.value.ct_state_trk &&
match.mask.ct_state_est && match.value.ct_state_est)
match.mask.ct_state_trk = 0;
/* Thanks to CT_TCP_FLAGS_INHIBIT, packets with interesting flags could
* match +trk-est (CT_HIT=0) despite being on an established connection.
* So make -est imply -tcp_syn_fin_rst match to ensure these packets
* still hit the software path.
*/
if (match.mask.ct_state_est && !match.value.ct_state_est) {
if (match.value.tcp_syn_fin_rst) {
/* Can't offload this combination */
NL_SET_ERR_MSG_MOD(extack, "TCP flags and -est conflict for offload");
rc = -EOPNOTSUPP;
goto release;
}
match.mask.tcp_syn_fin_rst = true;
}
flow_action_for_each(i, fa, &fr->action) {
switch (fa->id) {
case FLOW_ACTION_REDIRECT:
case FLOW_ACTION_MIRRED: /* mirred means mirror here */
to_efv = efx_tc_flower_lookup_efv(efx, fa->dev);
if (IS_ERR(to_efv))
continue;
found = true;
break;
default:
break;
}
}
if (!found) { /* We don't care. */
netif_dbg(efx, drv, efx->net_dev,
"Ignoring foreign filter that doesn't egdev us\n");
rc = -EOPNOTSUPP;
goto release;
}
rc = efx_mae_match_check_caps(efx, &match.mask, extack);
if (rc)
goto release;
if (efx_tc_match_is_encap(&match.mask)) {
enum efx_encap_type type;
type = efx_tc_indr_netdev_type(net_dev);
if (type == EFX_ENCAP_TYPE_NONE) {
NL_SET_ERR_MSG_MOD(extack,
"Egress encap match on unsupported tunnel device");
rc = -EOPNOTSUPP;
goto release;
}
rc = efx_mae_check_encap_type_supported(efx, type);
if (rc) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"Firmware reports no support for %s encap match",
efx_tc_encap_type_name(type));
goto release;
}
rc = efx_tc_flower_record_encap_match(efx, &match, type,
EFX_TC_EM_DIRECT, 0, 0,
extack);
if (rc)
goto release;
} else if (!tc->common.chain_index) {
/* This is not a tunnel decap rule, ignore it */
netif_dbg(efx, drv, efx->net_dev,
"Ignoring foreign filter without encap match\n");
rc = -EOPNOTSUPP;
goto release;
}
rule = kzalloc(sizeof(*rule), GFP_USER);
if (!rule) {
rc = -ENOMEM;
goto release;
}
INIT_LIST_HEAD(&rule->acts.list);
rule->cookie = tc->cookie;
old = rhashtable_lookup_get_insert_fast(&efx->tc->match_action_ht,
&rule->linkage,
efx_tc_match_action_ht_params);
if (IS_ERR(old)) {
rc = PTR_ERR(old);
goto release;
} else if (old) {
netif_dbg(efx, drv, efx->net_dev,
"Ignoring already-offloaded rule (cookie %lx)\n",
tc->cookie);
rc = -EEXIST;
goto release;
}
act = kzalloc(sizeof(*act), GFP_USER);
if (!act) {
rc = -ENOMEM;
goto release;
}
/* Parse actions. For foreign rules we only support decap & redirect.
* See corresponding code in efx_tc_flower_replace() for theory of
* operation & how 'act' cursor is used.
*/
flow_action_for_each(i, fa, &fr->action) {
struct efx_tc_action_set save;
switch (fa->id) {
case FLOW_ACTION_REDIRECT:
case FLOW_ACTION_MIRRED:
/* See corresponding code in efx_tc_flower_replace() for
* long explanations of what's going on here.
*/
save = *act;
if (fa->hw_stats) {
struct efx_tc_counter_index *ctr;
if (!(fa->hw_stats & FLOW_ACTION_HW_STATS_DELAYED)) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"hw_stats_type %u not supported (only 'delayed')",
fa->hw_stats);
rc = -EOPNOTSUPP;
goto release;
}
if (!efx_tc_flower_action_order_ok(act, EFX_TC_AO_COUNT)) {
NL_SET_ERR_MSG_MOD(extack, "Count action violates action order (can't happen)");
rc = -EOPNOTSUPP;
goto release;
}
ctr = efx_tc_flower_get_counter_index(efx,
tc->cookie,
EFX_TC_COUNTER_TYPE_AR);
if (IS_ERR(ctr)) {
rc = PTR_ERR(ctr);
NL_SET_ERR_MSG_MOD(extack, "Failed to obtain a counter");
goto release;
}
act->count = ctr;
INIT_LIST_HEAD(&act->count_user);
}
if (!efx_tc_flower_action_order_ok(act, EFX_TC_AO_DELIVER)) {
/* can't happen */
rc = -EOPNOTSUPP;
NL_SET_ERR_MSG_MOD(extack,
"Deliver action violates action order (can't happen)");
goto release;
}
to_efv = efx_tc_flower_lookup_efv(efx, fa->dev);
/* PF implies egdev is us, in which case we really
* want to deliver to the uplink (because this is an
* ingress filter). If we don't recognise the egdev
* at all, then we'd better trap so SW can handle it.
*/
if (IS_ERR(to_efv))
to_efv = EFX_EFV_PF;
if (to_efv == EFX_EFV_PF) {
if (uplinked)
break;
uplinked = true;
}
rc = efx_tc_flower_internal_mport(efx, to_efv);
if (rc < 0) {
NL_SET_ERR_MSG_MOD(extack, "Failed to identify egress m-port");
goto release;
}
act->dest_mport = rc;
act->deliver = 1;
rc = efx_mae_alloc_action_set(efx, act);
if (rc) {
NL_SET_ERR_MSG_MOD(extack,
"Failed to write action set to hw (mirred)");
goto release;
}
list_add_tail(&act->list, &rule->acts.list);
act = NULL;
if (fa->id == FLOW_ACTION_REDIRECT)
break; /* end of the line */
/* Mirror, so continue on with saved act */
act = kzalloc(sizeof(*act), GFP_USER);
if (!act) {
rc = -ENOMEM;
goto release;
}
*act = save;
break;
case FLOW_ACTION_TUNNEL_DECAP:
if (!efx_tc_flower_action_order_ok(act, EFX_TC_AO_DECAP)) {
rc = -EINVAL;
NL_SET_ERR_MSG_MOD(extack, "Decap action violates action order");
goto release;
}
act->decap = 1;
/* If we previously delivered/trapped to uplink, now
* that we've decapped we'll want another copy if we
* try to deliver/trap to uplink again.
*/
uplinked = false;
break;
default:
NL_SET_ERR_MSG_FMT_MOD(extack, "Unhandled action %u",
fa->id);
rc = -EOPNOTSUPP;
goto release;
}
}
if (act) {
if (!uplinked) {
/* Not shot/redirected, so deliver to default dest (which is
* the uplink, as this is an ingress filter)
*/
efx_mae_mport_uplink(efx, &act->dest_mport);
act->deliver = 1;
}
rc = efx_mae_alloc_action_set(efx, act);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to write action set to hw (deliver)");
goto release;
}
list_add_tail(&act->list, &rule->acts.list);
act = NULL; /* Prevent double-free in error path */
}
rule->match = match;
netif_dbg(efx, drv, efx->net_dev,
"Successfully parsed foreign filter (cookie %lx)\n",
tc->cookie);
rc = efx_mae_alloc_action_set_list(efx, &rule->acts);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to write action set list to hw");
goto release;
}
rc = efx_mae_insert_rule(efx, &rule->match, EFX_TC_PRIO_TC,
rule->acts.fw_id, &rule->fw_id);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to insert rule in hw");
goto release_acts;
}
return 0;
release_acts:
efx_mae_free_action_set_list(efx, &rule->acts);
release:
/* We failed to insert the rule, so free up any entries we created in
* subsidiary tables.
*/
if (match.rid)
efx_tc_put_recirc_id(efx, match.rid);
if (act)
efx_tc_free_action_set(efx, act, false);
if (rule) {
if (!old)
rhashtable_remove_fast(&efx->tc->match_action_ht,
&rule->linkage,
efx_tc_match_action_ht_params);
efx_tc_free_action_set_list(efx, &rule->acts, false);
}
kfree(rule);
if (match.encap)
efx_tc_flower_release_encap_match(efx, match.encap);
return rc;
}
static int efx_tc_flower_replace_lhs(struct efx_nic *efx,
struct flow_cls_offload *tc,
struct flow_rule *fr,
struct efx_tc_match *match,
struct efx_rep *efv,
struct net_device *net_dev)
{
struct netlink_ext_ack *extack = tc->common.extack;
struct efx_tc_lhs_rule *rule, *old;
int rc;
if (tc->common.chain_index) {
NL_SET_ERR_MSG_MOD(extack, "LHS rule only allowed in chain 0");
return -EOPNOTSUPP;
}
if (match->mask.ct_state_trk && match->value.ct_state_trk) {
NL_SET_ERR_MSG_MOD(extack, "LHS rule can never match +trk");
return -EOPNOTSUPP;
}
/* LHS rules are always -trk, so we don't need to match on that */
match->mask.ct_state_trk = 0;
match->value.ct_state_trk = 0;
rc = efx_mae_match_check_caps_lhs(efx, &match->mask, extack);
if (rc)
return rc;
rule = kzalloc(sizeof(*rule), GFP_USER);
if (!rule)
return -ENOMEM;
rule->cookie = tc->cookie;
old = rhashtable_lookup_get_insert_fast(&efx->tc->lhs_rule_ht,
&rule->linkage,
efx_tc_lhs_rule_ht_params);
if (IS_ERR(old)) {
rc = PTR_ERR(old);
goto release;
} else if (old) {
netif_dbg(efx, drv, efx->net_dev,
"Already offloaded rule (cookie %lx)\n", tc->cookie);
rc = -EEXIST;
NL_SET_ERR_MSG_MOD(extack, "Rule already offloaded");
goto release;
}
/* Parse actions */
/* See note in efx_tc_flower_replace() regarding passed net_dev
* (used for efx_tc_get_recirc_id()).
*/
rc = efx_tc_flower_handle_lhs_actions(efx, tc, fr, efx->net_dev, rule);
if (rc)
goto release;
rule->match = *match;
rc = efx_mae_insert_lhs_rule(efx, rule, EFX_TC_PRIO_TC);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to insert rule in hw");
goto release;
}
netif_dbg(efx, drv, efx->net_dev,
"Successfully parsed lhs rule (cookie %lx)\n",
tc->cookie);
return 0;
release:
efx_tc_flower_release_lhs_actions(efx, &rule->lhs_act);
if (!old)
rhashtable_remove_fast(&efx->tc->lhs_rule_ht, &rule->linkage,
efx_tc_lhs_rule_ht_params);
kfree(rule);
return rc;
}
static int efx_tc_flower_replace(struct efx_nic *efx,
struct net_device *net_dev,
struct flow_cls_offload *tc,
struct efx_rep *efv)
{
struct flow_rule *fr = flow_cls_offload_flow_rule(tc);
struct netlink_ext_ack *extack = tc->common.extack;
const struct ip_tunnel_info *encap_info = NULL;
struct efx_tc_flow_rule *rule = NULL, *old;
struct efx_tc_mangler_state mung = {};
struct efx_tc_action_set *act = NULL;
const struct flow_action_entry *fa;
struct efx_rep *from_efv, *to_efv;
struct efx_tc_match match;
u32 acts_id;
s64 rc;
int i;
if (!tc_can_offload_extack(efx->net_dev, extack))
return -EOPNOTSUPP;
if (WARN_ON(!efx->tc))
return -ENETDOWN;
if (WARN_ON(!efx->tc->up))
return -ENETDOWN;
from_efv = efx_tc_flower_lookup_efv(efx, net_dev);
if (IS_ERR(from_efv)) {
/* Not from our PF or representors, so probably a tunnel dev */
return efx_tc_flower_replace_foreign(efx, net_dev, tc);
}
if (efv != from_efv) {
/* can't happen */
NL_SET_ERR_MSG_FMT_MOD(extack, "for %s efv is %snull but from_efv is %snull (can't happen)",
netdev_name(net_dev), efv ? "non-" : "",
from_efv ? "non-" : "");
return -EINVAL;
}
/* Parse match */
memset(&match, 0, sizeof(match));
rc = efx_tc_flower_external_mport(efx, from_efv);
if (rc < 0) {
NL_SET_ERR_MSG_MOD(extack, "Failed to identify ingress m-port");
return rc;
}
match.value.ingress_port = rc;
match.mask.ingress_port = ~0;
rc = efx_tc_flower_parse_match(efx, fr, &match, extack);
if (rc)
return rc;
if (efx_tc_match_is_encap(&match.mask)) {
NL_SET_ERR_MSG_MOD(extack, "Ingress enc_key matches not supported");
return -EOPNOTSUPP;
}
if (efx_tc_rule_is_lhs_rule(fr, &match))
return efx_tc_flower_replace_lhs(efx, tc, fr, &match, efv,
net_dev);
/* chain_index 0 is always recirc_id 0 (and does not appear in recirc_ht).
* Conveniently, match.rid == NULL and match.value.recirc_id == 0 owing
* to the initial memset(), so we don't need to do anything in that case.
*/
if (tc->common.chain_index) {
struct efx_tc_recirc_id *rid;
/* Note regarding passed net_dev:
* VFreps and PF can share chain namespace, as they have
* distinct ingress_mports. So we don't need to burn an
* extra recirc_id if both use the same chain_index.
* (Strictly speaking, we could give each VFrep its own
* recirc_id namespace that doesn't take IDs away from the
* PF, but that would require a bunch of additional IDAs -
* one for each representor - and that's not likely to be
* the main cause of recirc_id exhaustion anyway.)
*/
rid = efx_tc_get_recirc_id(efx, tc->common.chain_index,
efx->net_dev);
if (IS_ERR(rid)) {
NL_SET_ERR_MSG_FMT_MOD(extack,
"Failed to allocate a hardware recirculation ID for chain_index %u",
tc->common.chain_index);
return PTR_ERR(rid);
}
match.rid = rid;
match.value.recirc_id = rid->fw_id;
}
match.mask.recirc_id = 0xff;
/* AR table can't match on DO_CT (+trk). But a commonly used pattern is
* +trk+est, which is strictly implied by +est, so rewrite it to that.
*/
if (match.mask.ct_state_trk && match.value.ct_state_trk &&
match.mask.ct_state_est && match.value.ct_state_est)
match.mask.ct_state_trk = 0;
/* Thanks to CT_TCP_FLAGS_INHIBIT, packets with interesting flags could
* match +trk-est (CT_HIT=0) despite being on an established connection.
* So make -est imply -tcp_syn_fin_rst match to ensure these packets
* still hit the software path.
*/
if (match.mask.ct_state_est && !match.value.ct_state_est) {
if (match.value.tcp_syn_fin_rst) {
/* Can't offload this combination */
rc = -EOPNOTSUPP;
goto release;
}
match.mask.tcp_syn_fin_rst = true;
}
rc = efx_mae_match_check_caps(efx, &match.mask, extack);
if (rc)
goto release;
rule = kzalloc(sizeof(*rule), GFP_USER);
if (!rule) {
rc = -ENOMEM;
goto release;
}
INIT_LIST_HEAD(&rule->acts.list);
rule->cookie = tc->cookie;
old = rhashtable_lookup_get_insert_fast(&efx->tc->match_action_ht,
&rule->linkage,
efx_tc_match_action_ht_params);
if (IS_ERR(old)) {
rc = PTR_ERR(old);
goto release;
} else if (old) {
netif_dbg(efx, drv, efx->net_dev,
"Already offloaded rule (cookie %lx)\n", tc->cookie);
NL_SET_ERR_MSG_MOD(extack, "Rule already offloaded");
rc = -EEXIST;
goto release;
}
/* Parse actions */
act = kzalloc(sizeof(*act), GFP_USER);
if (!act) {
rc = -ENOMEM;
goto release;
}
/**
* DOC: TC action translation
*
* Actions in TC are sequential and cumulative, with delivery actions
* potentially anywhere in the order. The EF100 MAE, however, takes
* an 'action set list' consisting of 'action sets', each of which is
* applied to the _original_ packet, and consists of a set of optional
* actions in a fixed order with delivery at the end.
* To translate between these two models, we maintain a 'cursor', @act,
* which describes the cumulative effect of all the packet-mutating
* actions encountered so far; on handling a delivery (mirred or drop)
* action, once the action-set has been inserted into hardware, we
* append @act to the action-set list (@rule->acts); if this is a pipe
* action (mirred mirror) we then allocate a new @act with a copy of
* the cursor state _before_ the delivery action, otherwise we set @act
* to %NULL.
* This ensures that every allocated action-set is either attached to
* @rule->acts or pointed to by @act (and never both), and that only
* those action-sets in @rule->acts exist in hardware. Consequently,
* in the failure path, @act only needs to be freed in memory, whereas
* for @rule->acts we remove each action-set from hardware before
* freeing it (efx_tc_free_action_set_list()), even if the action-set
* list itself is not in hardware.
*/
flow_action_for_each(i, fa, &fr->action) {
struct efx_tc_action_set save;
u16 tci;
if (!act) {
/* more actions after a non-pipe action */
NL_SET_ERR_MSG_MOD(extack, "Action follows non-pipe action");
rc = -EINVAL;
goto release;
}
if ((fa->id == FLOW_ACTION_REDIRECT ||
fa->id == FLOW_ACTION_MIRRED ||
fa->id == FLOW_ACTION_DROP) && fa->hw_stats) {
struct efx_tc_counter_index *ctr;
/* Currently the only actions that want stats are
* mirred and gact (ok, shot, trap, goto-chain), which
* means we want stats just before delivery. Also,
* note that tunnel_key set shouldn't change the length
* — it's only the subsequent mirred that does that,
* and the stats are taken _before_ the mirred action
* happens.
*/
if (!efx_tc_flower_action_order_ok(act, EFX_TC_AO_COUNT)) {
/* All supported actions that count either steal
* (gact shot, mirred redirect) or clone act
* (mirred mirror), so we should never get two
* count actions on one action_set.
*/
NL_SET_ERR_MSG_MOD(extack, "Count-action conflict (can't happen)");
rc = -EOPNOTSUPP;
goto release;
}
if (!(fa->hw_stats & FLOW_ACTION_HW_STATS_DELAYED)) {
NL_SET_ERR_MSG_FMT_MOD(extack, "hw_stats_type %u not supported (only 'delayed')",
fa->hw_stats);
rc = -EOPNOTSUPP;
goto release;
}
ctr = efx_tc_flower_get_counter_index(efx, tc->cookie,
EFX_TC_COUNTER_TYPE_AR);
if (IS_ERR(ctr)) {
rc = PTR_ERR(ctr);
NL_SET_ERR_MSG_MOD(extack, "Failed to obtain a counter");
goto release;
}
act->count = ctr;
INIT_LIST_HEAD(&act->count_user);
}
switch (fa->id) {
case FLOW_ACTION_DROP:
rc = efx_mae_alloc_action_set(efx, act);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to write action set to hw (drop)");
goto release;
}
list_add_tail(&act->list, &rule->acts.list);
act = NULL; /* end of the line */
break;
case FLOW_ACTION_REDIRECT:
case FLOW_ACTION_MIRRED:
save = *act;
if (encap_info) {
struct efx_tc_encap_action *encap;
if (!efx_tc_flower_action_order_ok(act,
EFX_TC_AO_ENCAP)) {
rc = -EOPNOTSUPP;
NL_SET_ERR_MSG_MOD(extack, "Encap action violates action order");
goto release;
}
encap = efx_tc_flower_create_encap_md(
efx, encap_info, fa->dev, extack);
if (IS_ERR_OR_NULL(encap)) {
rc = PTR_ERR(encap);
if (!rc)
rc = -EIO; /* arbitrary */
goto release;
}
act->encap_md = encap;
list_add_tail(&act->encap_user, &encap->users);
act->dest_mport = encap->dest_mport;
act->deliver = 1;
if (act->count && !WARN_ON(!act->count->cnt)) {
/* This counter is used by an encap
* action, which needs a reference back
* so it can prod neighbouring whenever
* traffic is seen.
*/
spin_lock_bh(&act->count->cnt->lock);
list_add_tail(&act->count_user,
&act->count->cnt->users);
spin_unlock_bh(&act->count->cnt->lock);
}
rc = efx_mae_alloc_action_set(efx, act);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to write action set to hw (encap)");
goto release;
}
list_add_tail(&act->list, &rule->acts.list);
act->user = &rule->acts;
act = NULL;
if (fa->id == FLOW_ACTION_REDIRECT)
break; /* end of the line */
/* Mirror, so continue on with saved act */
save.count = NULL;
act = kzalloc(sizeof(*act), GFP_USER);
if (!act) {
rc = -ENOMEM;
goto release;
}
*act = save;
break;
}
if (!efx_tc_flower_action_order_ok(act, EFX_TC_AO_DELIVER)) {
/* can't happen */
rc = -EOPNOTSUPP;
NL_SET_ERR_MSG_MOD(extack, "Deliver action violates action order (can't happen)");
goto release;
}
to_efv = efx_tc_flower_lookup_efv(efx, fa->dev);
if (IS_ERR(to_efv)) {
NL_SET_ERR_MSG_MOD(extack, "Mirred egress device not on switch");
rc = PTR_ERR(to_efv);
goto release;
}
rc = efx_tc_flower_external_mport(efx, to_efv);
if (rc < 0) {
NL_SET_ERR_MSG_MOD(extack, "Failed to identify egress m-port");
goto release;
}
act->dest_mport = rc;
act->deliver = 1;
rc = efx_mae_alloc_action_set(efx, act);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to write action set to hw (mirred)");
goto release;
}
list_add_tail(&act->list, &rule->acts.list);
act = NULL;
if (fa->id == FLOW_ACTION_REDIRECT)
break; /* end of the line */
/* Mirror, so continue on with saved act */
save.count = NULL;
act = kzalloc(sizeof(*act), GFP_USER);
if (!act) {
rc = -ENOMEM;
goto release;
}
*act = save;
break;
case FLOW_ACTION_VLAN_POP:
if (act->vlan_push) {
act->vlan_push--;
} else if (efx_tc_flower_action_order_ok(act, EFX_TC_AO_VLAN_POP)) {
act->vlan_pop++;
} else {
NL_SET_ERR_MSG_MOD(extack,
"More than two VLAN pops, or action order violated");
rc = -EINVAL;
goto release;
}
break;
case FLOW_ACTION_VLAN_PUSH:
if (!efx_tc_flower_action_order_ok(act, EFX_TC_AO_VLAN_PUSH)) {
rc = -EINVAL;
NL_SET_ERR_MSG_MOD(extack,
"More than two VLAN pushes, or action order violated");
goto release;
}
tci = fa->vlan.vid & VLAN_VID_MASK;
tci |= fa->vlan.prio << VLAN_PRIO_SHIFT;
act->vlan_tci[act->vlan_push] = cpu_to_be16(tci);
act->vlan_proto[act->vlan_push] = fa->vlan.proto;
act->vlan_push++;
break;
case FLOW_ACTION_ADD:
rc = efx_tc_pedit_add(efx, act, fa, extack);
if (rc < 0)
goto release;
break;
case FLOW_ACTION_MANGLE:
rc = efx_tc_mangle(efx, act, fa, &mung, extack, &match);
if (rc < 0)
goto release;
break;
case FLOW_ACTION_TUNNEL_ENCAP:
if (encap_info) {
/* Can't specify encap multiple times.
* If you want to overwrite an existing
* encap_info, use an intervening
* FLOW_ACTION_TUNNEL_DECAP to clear it.
*/
NL_SET_ERR_MSG_MOD(extack, "Tunnel key set when already set");
rc = -EINVAL;
goto release;
}
if (!fa->tunnel) {
NL_SET_ERR_MSG_MOD(extack, "Tunnel key set is missing key");
rc = -EOPNOTSUPP;
goto release;
}
encap_info = fa->tunnel;
break;
case FLOW_ACTION_TUNNEL_DECAP:
if (encap_info) {
encap_info = NULL;
break;
}
/* Since we don't support enc_key matches on ingress
* (and if we did there'd be no tunnel-device to give
* us a type), we can't offload a decap that's not
* just undoing a previous encap action.
*/
NL_SET_ERR_MSG_MOD(extack, "Cannot offload tunnel decap action without tunnel device");
rc = -EOPNOTSUPP;
goto release;
case FLOW_ACTION_CT:
if (fa->ct.action != TCA_CT_ACT_NAT) {
rc = -EOPNOTSUPP;
NL_SET_ERR_MSG_FMT_MOD(extack, "Can only offload CT 'nat' action in RHS rules, not %d", fa->ct.action);
goto release;
}
act->do_nat = 1;
break;
default:
NL_SET_ERR_MSG_FMT_MOD(extack, "Unhandled action %u",
fa->id);
rc = -EOPNOTSUPP;
goto release;
}
}
rc = efx_tc_incomplete_mangle(&mung, extack);
if (rc < 0)
goto release;
if (act) {
/* Not shot/redirected, so deliver to default dest */
if (from_efv == EFX_EFV_PF)
/* Rule applies to traffic from the wire,
* and default dest is thus the PF
*/
efx_mae_mport_uplink(efx, &act->dest_mport);
else
/* Representor, so rule applies to traffic from
* representee, and default dest is thus the rep.
* All reps use the same mport for delivery
*/
efx_mae_mport_mport(efx, efx->tc->reps_mport_id,
&act->dest_mport);
act->deliver = 1;
rc = efx_mae_alloc_action_set(efx, act);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to write action set to hw (deliver)");
goto release;
}
list_add_tail(&act->list, &rule->acts.list);
act = NULL; /* Prevent double-free in error path */
}
netif_dbg(efx, drv, efx->net_dev,
"Successfully parsed filter (cookie %lx)\n",
tc->cookie);
rule->match = match;
rc = efx_mae_alloc_action_set_list(efx, &rule->acts);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to write action set list to hw");
goto release;
}
if (from_efv == EFX_EFV_PF)
/* PF netdev, so rule applies to traffic from wire */
rule->fallback = &efx->tc->facts.pf;
else
/* repdev, so rule applies to traffic from representee */
rule->fallback = &efx->tc->facts.reps;
if (!efx_tc_check_ready(efx, rule)) {
netif_dbg(efx, drv, efx->net_dev, "action not ready for hw\n");
acts_id = rule->fallback->fw_id;
} else {
netif_dbg(efx, drv, efx->net_dev, "ready for hw\n");
acts_id = rule->acts.fw_id;
}
rc = efx_mae_insert_rule(efx, &rule->match, EFX_TC_PRIO_TC,
acts_id, &rule->fw_id);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to insert rule in hw");
goto release_acts;
}
return 0;
release_acts:
efx_mae_free_action_set_list(efx, &rule->acts);
release:
/* We failed to insert the rule, so free up any entries we created in
* subsidiary tables.
*/
if (match.rid)
efx_tc_put_recirc_id(efx, match.rid);
if (act)
efx_tc_free_action_set(efx, act, false);
if (rule) {
if (!old)
rhashtable_remove_fast(&efx->tc->match_action_ht,
&rule->linkage,
efx_tc_match_action_ht_params);
efx_tc_free_action_set_list(efx, &rule->acts, false);
}
kfree(rule);
return rc;
}
static int efx_tc_flower_destroy(struct efx_nic *efx,
struct net_device *net_dev,
struct flow_cls_offload *tc)
{
struct netlink_ext_ack *extack = tc->common.extack;
struct efx_tc_lhs_rule *lhs_rule;
struct efx_tc_flow_rule *rule;
lhs_rule = rhashtable_lookup_fast(&efx->tc->lhs_rule_ht, &tc->cookie,
efx_tc_lhs_rule_ht_params);
if (lhs_rule) {
/* Remove it from HW */
efx_mae_remove_lhs_rule(efx, lhs_rule);
/* Delete it from SW */
efx_tc_flower_release_lhs_actions(efx, &lhs_rule->lhs_act);
rhashtable_remove_fast(&efx->tc->lhs_rule_ht, &lhs_rule->linkage,
efx_tc_lhs_rule_ht_params);
if (lhs_rule->match.encap)
efx_tc_flower_release_encap_match(efx, lhs_rule->match.encap);
netif_dbg(efx, drv, efx->net_dev, "Removed (lhs) filter %lx\n",
lhs_rule->cookie);
kfree(lhs_rule);
return 0;
}
rule = rhashtable_lookup_fast(&efx->tc->match_action_ht, &tc->cookie,
efx_tc_match_action_ht_params);
if (!rule) {
/* Only log a message if we're the ingress device. Otherwise
* it's a foreign filter and we might just not have been
* interested (e.g. we might not have been the egress device
* either).
*/
if (!IS_ERR(efx_tc_flower_lookup_efv(efx, net_dev)))
netif_warn(efx, drv, efx->net_dev,
"Filter %lx not found to remove\n", tc->cookie);
NL_SET_ERR_MSG_MOD(extack, "Flow cookie not found in offloaded rules");
return -ENOENT;
}
/* Remove it from HW */
efx_tc_delete_rule(efx, rule);
/* Delete it from SW */
rhashtable_remove_fast(&efx->tc->match_action_ht, &rule->linkage,
efx_tc_match_action_ht_params);
netif_dbg(efx, drv, efx->net_dev, "Removed filter %lx\n", rule->cookie);
kfree(rule);
return 0;
}
static int efx_tc_flower_stats(struct efx_nic *efx, struct net_device *net_dev,
struct flow_cls_offload *tc)
{
struct netlink_ext_ack *extack = tc->common.extack;
struct efx_tc_counter_index *ctr;
struct efx_tc_counter *cnt;
u64 packets, bytes;
ctr = efx_tc_flower_find_counter_index(efx, tc->cookie);
if (!ctr) {
/* See comment in efx_tc_flower_destroy() */
if (!IS_ERR(efx_tc_flower_lookup_efv(efx, net_dev)))
if (net_ratelimit())
netif_warn(efx, drv, efx->net_dev,
"Filter %lx not found for stats\n",
tc->cookie);
NL_SET_ERR_MSG_MOD(extack, "Flow cookie not found in offloaded rules");
return -ENOENT;
}
if (WARN_ON(!ctr->cnt)) /* can't happen */
return -EIO;
cnt = ctr->cnt;
spin_lock_bh(&cnt->lock);
/* Report only new pkts/bytes since last time TC asked */
packets = cnt->packets;
bytes = cnt->bytes;
flow_stats_update(&tc->stats, bytes - cnt->old_bytes,
packets - cnt->old_packets, 0, cnt->touched,
FLOW_ACTION_HW_STATS_DELAYED);
cnt->old_packets = packets;
cnt->old_bytes = bytes;
spin_unlock_bh(&cnt->lock);
return 0;
}
int efx_tc_flower(struct efx_nic *efx, struct net_device *net_dev,
struct flow_cls_offload *tc, struct efx_rep *efv)
{
int rc;
if (!efx->tc)
return -EOPNOTSUPP;
mutex_lock(&efx->tc->mutex);
switch (tc->command) {
case FLOW_CLS_REPLACE:
rc = efx_tc_flower_replace(efx, net_dev, tc, efv);
break;
case FLOW_CLS_DESTROY:
rc = efx_tc_flower_destroy(efx, net_dev, tc);
break;
case FLOW_CLS_STATS:
rc = efx_tc_flower_stats(efx, net_dev, tc);
break;
default:
rc = -EOPNOTSUPP;
break;
}
mutex_unlock(&efx->tc->mutex);
return rc;
}
static int efx_tc_configure_default_rule(struct efx_nic *efx, u32 ing_port,
u32 eg_port, struct efx_tc_flow_rule *rule)
{
struct efx_tc_action_set_list *acts = &rule->acts;
struct efx_tc_match *match = &rule->match;
struct efx_tc_action_set *act;
int rc;
match->value.ingress_port = ing_port;
match->mask.ingress_port = ~0;
act = kzalloc(sizeof(*act), GFP_KERNEL);
if (!act)
return -ENOMEM;
act->deliver = 1;
act->dest_mport = eg_port;
rc = efx_mae_alloc_action_set(efx, act);
if (rc)
goto fail1;
EFX_WARN_ON_PARANOID(!list_empty(&acts->list));
list_add_tail(&act->list, &acts->list);
rc = efx_mae_alloc_action_set_list(efx, acts);
if (rc)
goto fail2;
rc = efx_mae_insert_rule(efx, match, EFX_TC_PRIO_DFLT,
acts->fw_id, &rule->fw_id);
if (rc)
goto fail3;
return 0;
fail3:
efx_mae_free_action_set_list(efx, acts);
fail2:
list_del(&act->list);
efx_mae_free_action_set(efx, act->fw_id);
fail1:
kfree(act);
return rc;
}
static int efx_tc_configure_default_rule_pf(struct efx_nic *efx)
{
struct efx_tc_flow_rule *rule = &efx->tc->dflt.pf;
u32 ing_port, eg_port;
efx_mae_mport_uplink(efx, &ing_port);
efx_mae_mport_wire(efx, &eg_port);
return efx_tc_configure_default_rule(efx, ing_port, eg_port, rule);
}
static int efx_tc_configure_default_rule_wire(struct efx_nic *efx)
{
struct efx_tc_flow_rule *rule = &efx->tc->dflt.wire;
u32 ing_port, eg_port;
efx_mae_mport_wire(efx, &ing_port);
efx_mae_mport_uplink(efx, &eg_port);
return efx_tc_configure_default_rule(efx, ing_port, eg_port, rule);
}
int efx_tc_configure_default_rule_rep(struct efx_rep *efv)
{
struct efx_tc_flow_rule *rule = &efv->dflt;
struct efx_nic *efx = efv->parent;
u32 ing_port, eg_port;
efx_mae_mport_mport(efx, efv->mport, &ing_port);
efx_mae_mport_mport(efx, efx->tc->reps_mport_id, &eg_port);
return efx_tc_configure_default_rule(efx, ing_port, eg_port, rule);
}
void efx_tc_deconfigure_default_rule(struct efx_nic *efx,
struct efx_tc_flow_rule *rule)
{
if (rule->fw_id != MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL)
efx_tc_delete_rule(efx, rule);
rule->fw_id = MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL;
}
static int efx_tc_configure_fallback_acts(struct efx_nic *efx, u32 eg_port,
struct efx_tc_action_set_list *acts)
{
struct efx_tc_action_set *act;
int rc;
act = kzalloc(sizeof(*act), GFP_KERNEL);
if (!act)
return -ENOMEM;
act->deliver = 1;
act->dest_mport = eg_port;
rc = efx_mae_alloc_action_set(efx, act);
if (rc)
goto fail1;
EFX_WARN_ON_PARANOID(!list_empty(&acts->list));
list_add_tail(&act->list, &acts->list);
rc = efx_mae_alloc_action_set_list(efx, acts);
if (rc)
goto fail2;
return 0;
fail2:
list_del(&act->list);
efx_mae_free_action_set(efx, act->fw_id);
fail1:
kfree(act);
return rc;
}
static int efx_tc_configure_fallback_acts_pf(struct efx_nic *efx)
{
struct efx_tc_action_set_list *acts = &efx->tc->facts.pf;
u32 eg_port;
efx_mae_mport_uplink(efx, &eg_port);
return efx_tc_configure_fallback_acts(efx, eg_port, acts);
}
static int efx_tc_configure_fallback_acts_reps(struct efx_nic *efx)
{
struct efx_tc_action_set_list *acts = &efx->tc->facts.reps;
u32 eg_port;
efx_mae_mport_mport(efx, efx->tc->reps_mport_id, &eg_port);
return efx_tc_configure_fallback_acts(efx, eg_port, acts);
}
static void efx_tc_deconfigure_fallback_acts(struct efx_nic *efx,
struct efx_tc_action_set_list *acts)
{
efx_tc_free_action_set_list(efx, acts, true);
}
static int efx_tc_configure_rep_mport(struct efx_nic *efx)
{
u32 rep_mport_label;
int rc;
rc = efx_mae_allocate_mport(efx, &efx->tc->reps_mport_id, &rep_mport_label);
if (rc)
return rc;
pci_dbg(efx->pci_dev, "created rep mport 0x%08x (0x%04x)\n",
efx->tc->reps_mport_id, rep_mport_label);
/* Use mport *selector* as vport ID */
efx_mae_mport_mport(efx, efx->tc->reps_mport_id,
&efx->tc->reps_mport_vport_id);
return 0;
}
static void efx_tc_deconfigure_rep_mport(struct efx_nic *efx)
{
efx_mae_free_mport(efx, efx->tc->reps_mport_id);
efx->tc->reps_mport_id = MAE_MPORT_SELECTOR_NULL;
}
int efx_tc_insert_rep_filters(struct efx_nic *efx)
{
struct efx_filter_spec promisc, allmulti;
int rc;
if (efx->type->is_vf)
return 0;
if (!efx->tc)
return 0;
efx_filter_init_rx(&promisc, EFX_FILTER_PRI_REQUIRED, 0, 0);
efx_filter_set_uc_def(&promisc);
efx_filter_set_vport_id(&promisc, efx->tc->reps_mport_vport_id);
rc = efx_filter_insert_filter(efx, &promisc, false);
if (rc < 0)
return rc;
efx->tc->reps_filter_uc = rc;
efx_filter_init_rx(&allmulti, EFX_FILTER_PRI_REQUIRED, 0, 0);
efx_filter_set_mc_def(&allmulti);
efx_filter_set_vport_id(&allmulti, efx->tc->reps_mport_vport_id);
rc = efx_filter_insert_filter(efx, &allmulti, false);
if (rc < 0)
return rc;
efx->tc->reps_filter_mc = rc;
return 0;
}
void efx_tc_remove_rep_filters(struct efx_nic *efx)
{
if (efx->type->is_vf)
return;
if (!efx->tc)
return;
if (efx->tc->reps_filter_mc >= 0)
efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, efx->tc->reps_filter_mc);
efx->tc->reps_filter_mc = -1;
if (efx->tc->reps_filter_uc >= 0)
efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, efx->tc->reps_filter_uc);
efx->tc->reps_filter_uc = -1;
}
int efx_init_tc(struct efx_nic *efx)
{
int rc;
rc = efx_mae_get_caps(efx, efx->tc->caps);
if (rc)
return rc;
if (efx->tc->caps->match_field_count > MAE_NUM_FIELDS)
/* Firmware supports some match fields the driver doesn't know
* about. Not fatal, unless any of those fields are required
* (MAE_FIELD_SUPPORTED_MATCH_ALWAYS) but if so we don't know.
*/
netif_warn(efx, probe, efx->net_dev,
"FW reports additional match fields %u\n",
efx->tc->caps->match_field_count);
if (efx->tc->caps->action_prios < EFX_TC_PRIO__NUM) {
netif_err(efx, probe, efx->net_dev,
"Too few action prios supported (have %u, need %u)\n",
efx->tc->caps->action_prios, EFX_TC_PRIO__NUM);
return -EIO;
}
rc = efx_tc_configure_default_rule_pf(efx);
if (rc)
return rc;
rc = efx_tc_configure_default_rule_wire(efx);
if (rc)
return rc;
rc = efx_tc_configure_rep_mport(efx);
if (rc)
return rc;
rc = efx_tc_configure_fallback_acts_pf(efx);
if (rc)
return rc;
rc = efx_tc_configure_fallback_acts_reps(efx);
if (rc)
return rc;
rc = efx_mae_get_tables(efx);
if (rc)
return rc;
rc = flow_indr_dev_register(efx_tc_indr_setup_cb, efx);
if (rc)
goto out_free;
efx->tc->up = true;
return 0;
out_free:
efx_mae_free_tables(efx);
return rc;
}
void efx_fini_tc(struct efx_nic *efx)
{
/* We can get called even if efx_init_struct_tc() failed */
if (!efx->tc)
return;
if (efx->tc->up)
flow_indr_dev_unregister(efx_tc_indr_setup_cb, efx, efx_tc_block_unbind);
efx_tc_deconfigure_rep_mport(efx);
efx_tc_deconfigure_default_rule(efx, &efx->tc->dflt.pf);
efx_tc_deconfigure_default_rule(efx, &efx->tc->dflt.wire);
efx_tc_deconfigure_fallback_acts(efx, &efx->tc->facts.pf);
efx_tc_deconfigure_fallback_acts(efx, &efx->tc->facts.reps);
efx->tc->up = false;
efx_mae_free_tables(efx);
}
/* At teardown time, all TC filter rules (and thus all resources they created)
* should already have been removed. If we find any in our hashtables, make a
* cursory attempt to clean up the software side.
*/
static void efx_tc_encap_match_free(void *ptr, void *__unused)
{
struct efx_tc_encap_match *encap = ptr;
WARN_ON(refcount_read(&encap->ref));
kfree(encap);
}
static void efx_tc_recirc_free(void *ptr, void *arg)
{
struct efx_tc_recirc_id *rid = ptr;
struct efx_nic *efx = arg;
WARN_ON(refcount_read(&rid->ref));
ida_free(&efx->tc->recirc_ida, rid->fw_id);
kfree(rid);
}
static void efx_tc_lhs_free(void *ptr, void *arg)
{
struct efx_tc_lhs_rule *rule = ptr;
struct efx_nic *efx = arg;
netif_err(efx, drv, efx->net_dev,
"tc lhs_rule %lx still present at teardown, removing\n",
rule->cookie);
if (rule->lhs_act.zone)
efx_tc_ct_unregister_zone(efx, rule->lhs_act.zone);
if (rule->lhs_act.count)
efx_tc_flower_put_counter_index(efx, rule->lhs_act.count);
efx_mae_remove_lhs_rule(efx, rule);
kfree(rule);
}
static void efx_tc_mac_free(void *ptr, void *__unused)
{
struct efx_tc_mac_pedit_action *ped = ptr;
WARN_ON(refcount_read(&ped->ref));
kfree(ped);
}
static void efx_tc_flow_free(void *ptr, void *arg)
{
struct efx_tc_flow_rule *rule = ptr;
struct efx_nic *efx = arg;
netif_err(efx, drv, efx->net_dev,
"tc rule %lx still present at teardown, removing\n",
rule->cookie);
/* Also releases entries in subsidiary tables */
efx_tc_delete_rule(efx, rule);
kfree(rule);
}
int efx_init_struct_tc(struct efx_nic *efx)
{
int rc;
if (efx->type->is_vf)
return 0;
efx->tc = kzalloc(sizeof(*efx->tc), GFP_KERNEL);
if (!efx->tc)
return -ENOMEM;
efx->tc->caps = kzalloc(sizeof(struct mae_caps), GFP_KERNEL);
if (!efx->tc->caps) {
rc = -ENOMEM;
goto fail_alloc_caps;
}
INIT_LIST_HEAD(&efx->tc->block_list);
mutex_init(&efx->tc->mutex);
init_waitqueue_head(&efx->tc->flush_wq);
rc = efx_tc_init_encap_actions(efx);
if (rc < 0)
goto fail_encap_actions;
rc = efx_tc_init_counters(efx);
if (rc < 0)
goto fail_counters;
rc = rhashtable_init(&efx->tc->mac_ht, &efx_tc_mac_ht_params);
if (rc < 0)
goto fail_mac_ht;
rc = rhashtable_init(&efx->tc->encap_match_ht, &efx_tc_encap_match_ht_params);
if (rc < 0)
goto fail_encap_match_ht;
rc = rhashtable_init(&efx->tc->match_action_ht, &efx_tc_match_action_ht_params);
if (rc < 0)
goto fail_match_action_ht;
rc = rhashtable_init(&efx->tc->lhs_rule_ht, &efx_tc_lhs_rule_ht_params);
if (rc < 0)
goto fail_lhs_rule_ht;
rc = efx_tc_init_conntrack(efx);
if (rc < 0)
goto fail_conntrack;
rc = rhashtable_init(&efx->tc->recirc_ht, &efx_tc_recirc_ht_params);
if (rc < 0)
goto fail_recirc_ht;
ida_init(&efx->tc->recirc_ida);
efx->tc->reps_filter_uc = -1;
efx->tc->reps_filter_mc = -1;
INIT_LIST_HEAD(&efx->tc->dflt.pf.acts.list);
efx->tc->dflt.pf.fw_id = MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL;
INIT_LIST_HEAD(&efx->tc->dflt.wire.acts.list);
efx->tc->dflt.wire.fw_id = MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL;
INIT_LIST_HEAD(&efx->tc->facts.pf.list);
efx->tc->facts.pf.fw_id = MC_CMD_MAE_ACTION_SET_ALLOC_OUT_ACTION_SET_ID_NULL;
INIT_LIST_HEAD(&efx->tc->facts.reps.list);
efx->tc->facts.reps.fw_id = MC_CMD_MAE_ACTION_SET_ALLOC_OUT_ACTION_SET_ID_NULL;
efx->extra_channel_type[EFX_EXTRA_CHANNEL_TC] = &efx_tc_channel_type;
return 0;
fail_recirc_ht:
efx_tc_destroy_conntrack(efx);
fail_conntrack:
rhashtable_destroy(&efx->tc->lhs_rule_ht);
fail_lhs_rule_ht:
rhashtable_destroy(&efx->tc->match_action_ht);
fail_match_action_ht:
rhashtable_destroy(&efx->tc->encap_match_ht);
fail_encap_match_ht:
rhashtable_destroy(&efx->tc->mac_ht);
fail_mac_ht:
efx_tc_destroy_counters(efx);
fail_counters:
efx_tc_destroy_encap_actions(efx);
fail_encap_actions:
mutex_destroy(&efx->tc->mutex);
kfree(efx->tc->caps);
fail_alloc_caps:
kfree(efx->tc);
efx->tc = NULL;
return rc;
}
void efx_fini_struct_tc(struct efx_nic *efx)
{
if (!efx->tc)
return;
mutex_lock(&efx->tc->mutex);
EFX_WARN_ON_PARANOID(efx->tc->dflt.pf.fw_id !=
MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL);
EFX_WARN_ON_PARANOID(efx->tc->dflt.wire.fw_id !=
MC_CMD_MAE_ACTION_RULE_INSERT_OUT_ACTION_RULE_ID_NULL);
EFX_WARN_ON_PARANOID(efx->tc->facts.pf.fw_id !=
MC_CMD_MAE_ACTION_SET_LIST_ALLOC_OUT_ACTION_SET_LIST_ID_NULL);
EFX_WARN_ON_PARANOID(efx->tc->facts.reps.fw_id !=
MC_CMD_MAE_ACTION_SET_LIST_ALLOC_OUT_ACTION_SET_LIST_ID_NULL);
rhashtable_free_and_destroy(&efx->tc->lhs_rule_ht, efx_tc_lhs_free, efx);
rhashtable_free_and_destroy(&efx->tc->match_action_ht, efx_tc_flow_free,
efx);
rhashtable_free_and_destroy(&efx->tc->encap_match_ht,
efx_tc_encap_match_free, NULL);
efx_tc_fini_conntrack(efx);
rhashtable_free_and_destroy(&efx->tc->recirc_ht, efx_tc_recirc_free, efx);
WARN_ON(!ida_is_empty(&efx->tc->recirc_ida));
ida_destroy(&efx->tc->recirc_ida);
rhashtable_free_and_destroy(&efx->tc->mac_ht, efx_tc_mac_free, NULL);
efx_tc_fini_counters(efx);
efx_tc_fini_encap_actions(efx);
mutex_unlock(&efx->tc->mutex);
mutex_destroy(&efx->tc->mutex);
kfree(efx->tc->caps);
kfree(efx->tc);
efx->tc = NULL;
}