// SPDX-License-Identifier: GPL-2.0-only
/****************************************************************************
* Driver for Solarflare network controllers and boards
* Copyright 2023, Advanced Micro Devices, 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 "tc_encap_actions.h"
#include "tc.h"
#include "mae.h"
#include <net/vxlan.h>
#include <net/geneve.h>
#include <net/netevent.h>
#include <net/arp.h>
static const struct rhashtable_params efx_neigh_ht_params = {
.key_len = offsetof(struct efx_neigh_binder, ha),
.key_offset = 0,
.head_offset = offsetof(struct efx_neigh_binder, linkage),
};
static const struct rhashtable_params efx_tc_encap_ht_params = {
.key_len = offsetofend(struct efx_tc_encap_action, key),
.key_offset = 0,
.head_offset = offsetof(struct efx_tc_encap_action, linkage),
};
static void efx_tc_encap_free(void *ptr, void *__unused)
{
struct efx_tc_encap_action *enc = ptr;
WARN_ON(refcount_read(&enc->ref));
kfree(enc);
}
static void efx_neigh_free(void *ptr, void *__unused)
{
struct efx_neigh_binder *neigh = ptr;
WARN_ON(refcount_read(&neigh->ref));
WARN_ON(!list_empty(&neigh->users));
put_net_track(neigh->net, &neigh->ns_tracker);
netdev_put(neigh->egdev, &neigh->dev_tracker);
kfree(neigh);
}
int efx_tc_init_encap_actions(struct efx_nic *efx)
{
int rc;
rc = rhashtable_init(&efx->tc->neigh_ht, &efx_neigh_ht_params);
if (rc < 0)
goto fail_neigh_ht;
rc = rhashtable_init(&efx->tc->encap_ht, &efx_tc_encap_ht_params);
if (rc < 0)
goto fail_encap_ht;
return 0;
fail_encap_ht:
rhashtable_destroy(&efx->tc->neigh_ht);
fail_neigh_ht:
return rc;
}
/* Only call this in init failure teardown.
* Normal exit should fini instead as there may be entries in the table.
*/
void efx_tc_destroy_encap_actions(struct efx_nic *efx)
{
rhashtable_destroy(&efx->tc->encap_ht);
rhashtable_destroy(&efx->tc->neigh_ht);
}
void efx_tc_fini_encap_actions(struct efx_nic *efx)
{
rhashtable_free_and_destroy(&efx->tc->encap_ht, efx_tc_encap_free, NULL);
rhashtable_free_and_destroy(&efx->tc->neigh_ht, efx_neigh_free, NULL);
}
static void efx_neigh_update(struct work_struct *work);
static int efx_bind_neigh(struct efx_nic *efx,
struct efx_tc_encap_action *encap, struct net *net,
struct netlink_ext_ack *extack)
{
struct efx_neigh_binder *neigh, *old;
struct flowi6 flow6 = {};
struct flowi4 flow4 = {};
int rc;
/* GCC stupidly thinks that only values explicitly listed in the enum
* definition can _possibly_ be sensible case values, so without this
* cast it complains about the IPv6 versions.
*/
switch ((int)encap->type) {
case EFX_ENCAP_TYPE_VXLAN:
case EFX_ENCAP_TYPE_GENEVE:
flow4.flowi4_proto = IPPROTO_UDP;
flow4.fl4_dport = encap->key.tp_dst;
flow4.flowi4_tos = encap->key.tos;
flow4.daddr = encap->key.u.ipv4.dst;
flow4.saddr = encap->key.u.ipv4.src;
break;
case EFX_ENCAP_TYPE_VXLAN | EFX_ENCAP_FLAG_IPV6:
case EFX_ENCAP_TYPE_GENEVE | EFX_ENCAP_FLAG_IPV6:
flow6.flowi6_proto = IPPROTO_UDP;
flow6.fl6_dport = encap->key.tp_dst;
flow6.flowlabel = ip6_make_flowinfo(encap->key.tos,
encap->key.label);
flow6.daddr = encap->key.u.ipv6.dst;
flow6.saddr = encap->key.u.ipv6.src;
break;
default:
NL_SET_ERR_MSG_FMT_MOD(extack, "Unsupported encap type %d",
(int)encap->type);
return -EOPNOTSUPP;
}
neigh = kzalloc(sizeof(*neigh), GFP_KERNEL_ACCOUNT);
if (!neigh)
return -ENOMEM;
neigh->net = get_net_track(net, &neigh->ns_tracker, GFP_KERNEL_ACCOUNT);
neigh->dst_ip = flow4.daddr;
neigh->dst_ip6 = flow6.daddr;
old = rhashtable_lookup_get_insert_fast(&efx->tc->neigh_ht,
&neigh->linkage,
efx_neigh_ht_params);
if (old) {
/* don't need our new entry */
put_net_track(neigh->net, &neigh->ns_tracker);
kfree(neigh);
if (IS_ERR(old)) /* oh dear, it's actually an error */
return PTR_ERR(old);
if (!refcount_inc_not_zero(&old->ref))
return -EAGAIN;
/* existing entry found, ref taken */
neigh = old;
} else {
/* New entry. We need to initiate a lookup */
struct neighbour *n;
struct rtable *rt;
if (encap->type & EFX_ENCAP_FLAG_IPV6) {
#if IS_ENABLED(CONFIG_IPV6)
struct dst_entry *dst;
dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &flow6,
NULL);
rc = PTR_ERR_OR_ZERO(dst);
if (rc) {
NL_SET_ERR_MSG_MOD(extack, "Failed to lookup route for IPv6 encap");
goto out_free;
}
neigh->egdev = dst->dev;
netdev_hold(neigh->egdev, &neigh->dev_tracker,
GFP_KERNEL_ACCOUNT);
neigh->ttl = ip6_dst_hoplimit(dst);
n = dst_neigh_lookup(dst, &flow6.daddr);
dst_release(dst);
#else
/* We shouldn't ever get here, because if IPv6 isn't
* enabled how did someone create an IPv6 tunnel_key?
*/
rc = -EOPNOTSUPP;
NL_SET_ERR_MSG_MOD(extack, "No IPv6 support (neigh bind)");
goto out_free;
#endif
} else {
rt = ip_route_output_key(net, &flow4);
if (IS_ERR_OR_NULL(rt)) {
rc = PTR_ERR_OR_ZERO(rt);
if (!rc)
rc = -EIO;
NL_SET_ERR_MSG_MOD(extack, "Failed to lookup route for encap");
goto out_free;
}
neigh->egdev = rt->dst.dev;
netdev_hold(neigh->egdev, &neigh->dev_tracker,
GFP_KERNEL_ACCOUNT);
neigh->ttl = ip4_dst_hoplimit(&rt->dst);
n = dst_neigh_lookup(&rt->dst, &flow4.daddr);
ip_rt_put(rt);
}
if (!n) {
rc = -ENETUNREACH;
NL_SET_ERR_MSG_MOD(extack, "Failed to lookup neighbour for encap");
netdev_put(neigh->egdev, &neigh->dev_tracker);
goto out_free;
}
refcount_set(&neigh->ref, 1);
INIT_LIST_HEAD(&neigh->users);
read_lock_bh(&n->lock);
ether_addr_copy(neigh->ha, n->ha);
neigh->n_valid = n->nud_state & NUD_VALID;
read_unlock_bh(&n->lock);
rwlock_init(&neigh->lock);
INIT_WORK(&neigh->work, efx_neigh_update);
neigh->efx = efx;
neigh->used = jiffies;
if (!neigh->n_valid)
/* Prod ARP to find us a neighbour */
neigh_event_send(n, NULL);
neigh_release(n);
}
/* Add us to this neigh */
encap->neigh = neigh;
list_add_tail(&encap->list, &neigh->users);
return 0;
out_free:
/* cleanup common to several error paths */
rhashtable_remove_fast(&efx->tc->neigh_ht, &neigh->linkage,
efx_neigh_ht_params);
synchronize_rcu();
put_net_track(net, &neigh->ns_tracker);
kfree(neigh);
return rc;
}
static void efx_free_neigh(struct efx_neigh_binder *neigh)
{
struct efx_nic *efx = neigh->efx;
rhashtable_remove_fast(&efx->tc->neigh_ht, &neigh->linkage,
efx_neigh_ht_params);
synchronize_rcu();
netdev_put(neigh->egdev, &neigh->dev_tracker);
put_net_track(neigh->net, &neigh->ns_tracker);
kfree(neigh);
}
static void efx_release_neigh(struct efx_nic *efx,
struct efx_tc_encap_action *encap)
{
struct efx_neigh_binder *neigh = encap->neigh;
if (!neigh)
return;
list_del(&encap->list);
encap->neigh = NULL;
if (!refcount_dec_and_test(&neigh->ref))
return; /* still in use */
efx_free_neigh(neigh);
}
static void efx_gen_tun_header_eth(struct efx_tc_encap_action *encap, u16 proto)
{
struct efx_neigh_binder *neigh = encap->neigh;
struct ethhdr *eth;
encap->encap_hdr_len = sizeof(*eth);
eth = (struct ethhdr *)encap->encap_hdr;
if (encap->neigh->n_valid)
ether_addr_copy(eth->h_dest, neigh->ha);
else
eth_zero_addr(eth->h_dest);
ether_addr_copy(eth->h_source, neigh->egdev->dev_addr);
eth->h_proto = htons(proto);
}
static void efx_gen_tun_header_ipv4(struct efx_tc_encap_action *encap, u8 ipproto, u8 len)
{
struct efx_neigh_binder *neigh = encap->neigh;
struct ip_tunnel_key *key = &encap->key;
struct iphdr *ip;
ip = (struct iphdr *)(encap->encap_hdr + encap->encap_hdr_len);
encap->encap_hdr_len += sizeof(*ip);
ip->daddr = key->u.ipv4.dst;
ip->saddr = key->u.ipv4.src;
ip->ttl = neigh->ttl;
ip->protocol = ipproto;
ip->version = 0x4;
ip->ihl = 0x5;
ip->tot_len = cpu_to_be16(ip->ihl * 4 + len);
ip_send_check(ip);
}
#ifdef CONFIG_IPV6
static void efx_gen_tun_header_ipv6(struct efx_tc_encap_action *encap, u8 ipproto, u8 len)
{
struct efx_neigh_binder *neigh = encap->neigh;
struct ip_tunnel_key *key = &encap->key;
struct ipv6hdr *ip;
ip = (struct ipv6hdr *)(encap->encap_hdr + encap->encap_hdr_len);
encap->encap_hdr_len += sizeof(*ip);
ip6_flow_hdr(ip, key->tos, key->label);
ip->daddr = key->u.ipv6.dst;
ip->saddr = key->u.ipv6.src;
ip->hop_limit = neigh->ttl;
ip->nexthdr = ipproto;
ip->version = 0x6;
ip->payload_len = cpu_to_be16(len);
}
#endif
static void efx_gen_tun_header_udp(struct efx_tc_encap_action *encap, u8 len)
{
struct ip_tunnel_key *key = &encap->key;
struct udphdr *udp;
udp = (struct udphdr *)(encap->encap_hdr + encap->encap_hdr_len);
encap->encap_hdr_len += sizeof(*udp);
udp->dest = key->tp_dst;
udp->len = cpu_to_be16(sizeof(*udp) + len);
}
static void efx_gen_tun_header_vxlan(struct efx_tc_encap_action *encap)
{
struct ip_tunnel_key *key = &encap->key;
struct vxlanhdr *vxlan;
vxlan = (struct vxlanhdr *)(encap->encap_hdr + encap->encap_hdr_len);
encap->encap_hdr_len += sizeof(*vxlan);
vxlan->vx_flags = VXLAN_HF_VNI;
vxlan->vx_vni = vxlan_vni_field(tunnel_id_to_key32(key->tun_id));
}
static void efx_gen_tun_header_geneve(struct efx_tc_encap_action *encap)
{
struct ip_tunnel_key *key = &encap->key;
struct genevehdr *geneve;
u32 vni;
geneve = (struct genevehdr *)(encap->encap_hdr + encap->encap_hdr_len);
encap->encap_hdr_len += sizeof(*geneve);
geneve->proto_type = htons(ETH_P_TEB);
/* convert tun_id to host-endian so we can use host arithmetic to
* extract individual bytes.
*/
vni = ntohl(tunnel_id_to_key32(key->tun_id));
geneve->vni[0] = vni >> 16;
geneve->vni[1] = vni >> 8;
geneve->vni[2] = vni;
}
#define vxlan_header_l4_len (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
#define vxlan4_header_len (sizeof(struct ethhdr) + sizeof(struct iphdr) + vxlan_header_l4_len)
static void efx_gen_vxlan_header_ipv4(struct efx_tc_encap_action *encap)
{
BUILD_BUG_ON(sizeof(encap->encap_hdr) < vxlan4_header_len);
efx_gen_tun_header_eth(encap, ETH_P_IP);
efx_gen_tun_header_ipv4(encap, IPPROTO_UDP, vxlan_header_l4_len);
efx_gen_tun_header_udp(encap, sizeof(struct vxlanhdr));
efx_gen_tun_header_vxlan(encap);
}
#define geneve_header_l4_len (sizeof(struct udphdr) + sizeof(struct genevehdr))
#define geneve4_header_len (sizeof(struct ethhdr) + sizeof(struct iphdr) + geneve_header_l4_len)
static void efx_gen_geneve_header_ipv4(struct efx_tc_encap_action *encap)
{
BUILD_BUG_ON(sizeof(encap->encap_hdr) < geneve4_header_len);
efx_gen_tun_header_eth(encap, ETH_P_IP);
efx_gen_tun_header_ipv4(encap, IPPROTO_UDP, geneve_header_l4_len);
efx_gen_tun_header_udp(encap, sizeof(struct genevehdr));
efx_gen_tun_header_geneve(encap);
}
#ifdef CONFIG_IPV6
#define vxlan6_header_len (sizeof(struct ethhdr) + sizeof(struct ipv6hdr) + vxlan_header_l4_len)
static void efx_gen_vxlan_header_ipv6(struct efx_tc_encap_action *encap)
{
BUILD_BUG_ON(sizeof(encap->encap_hdr) < vxlan6_header_len);
efx_gen_tun_header_eth(encap, ETH_P_IPV6);
efx_gen_tun_header_ipv6(encap, IPPROTO_UDP, vxlan_header_l4_len);
efx_gen_tun_header_udp(encap, sizeof(struct vxlanhdr));
efx_gen_tun_header_vxlan(encap);
}
#define geneve6_header_len (sizeof(struct ethhdr) + sizeof(struct ipv6hdr) + geneve_header_l4_len)
static void efx_gen_geneve_header_ipv6(struct efx_tc_encap_action *encap)
{
BUILD_BUG_ON(sizeof(encap->encap_hdr) < geneve6_header_len);
efx_gen_tun_header_eth(encap, ETH_P_IPV6);
efx_gen_tun_header_ipv6(encap, IPPROTO_UDP, geneve_header_l4_len);
efx_gen_tun_header_udp(encap, sizeof(struct genevehdr));
efx_gen_tun_header_geneve(encap);
}
#endif
static void efx_gen_encap_header(struct efx_nic *efx,
struct efx_tc_encap_action *encap)
{
encap->n_valid = encap->neigh->n_valid;
/* GCC stupidly thinks that only values explicitly listed in the enum
* definition can _possibly_ be sensible case values, so without this
* cast it complains about the IPv6 versions.
*/
switch ((int)encap->type) {
case EFX_ENCAP_TYPE_VXLAN:
efx_gen_vxlan_header_ipv4(encap);
break;
case EFX_ENCAP_TYPE_GENEVE:
efx_gen_geneve_header_ipv4(encap);
break;
#ifdef CONFIG_IPV6
case EFX_ENCAP_TYPE_VXLAN | EFX_ENCAP_FLAG_IPV6:
efx_gen_vxlan_header_ipv6(encap);
break;
case EFX_ENCAP_TYPE_GENEVE | EFX_ENCAP_FLAG_IPV6:
efx_gen_geneve_header_ipv6(encap);
break;
#endif
default:
/* unhandled encap type, can't happen */
if (net_ratelimit())
netif_err(efx, drv, efx->net_dev,
"Bogus encap type %d, can't generate\n",
encap->type);
/* Use fallback action. */
encap->n_valid = false;
break;
}
}
static void efx_tc_update_encap(struct efx_nic *efx,
struct efx_tc_encap_action *encap)
{
struct efx_tc_action_set_list *acts, *fallback;
struct efx_tc_flow_rule *rule;
struct efx_tc_action_set *act;
int rc;
if (encap->n_valid) {
/* Make sure no rules are using this encap while we change it */
list_for_each_entry(act, &encap->users, encap_user) {
acts = act->user;
if (WARN_ON(!acts)) /* can't happen */
continue;
rule = container_of(acts, struct efx_tc_flow_rule, acts);
if (rule->fallback)
fallback = rule->fallback;
else /* fallback fallback: deliver to PF */
fallback = &efx->tc->facts.pf;
rc = efx_mae_update_rule(efx, fallback->fw_id,
rule->fw_id);
if (rc)
netif_err(efx, drv, efx->net_dev,
"Failed to update (f) rule %08x rc %d\n",
rule->fw_id, rc);
else
netif_dbg(efx, drv, efx->net_dev, "Updated (f) rule %08x\n",
rule->fw_id);
}
}
/* Make sure we don't leak arbitrary bytes on the wire;
* set an all-0s ethernet header. A successful call to
* efx_gen_encap_header() will overwrite this.
*/
memset(encap->encap_hdr, 0, sizeof(encap->encap_hdr));
encap->encap_hdr_len = ETH_HLEN;
if (encap->neigh) {
read_lock_bh(&encap->neigh->lock);
efx_gen_encap_header(efx, encap);
read_unlock_bh(&encap->neigh->lock);
} else {
encap->n_valid = false;
}
rc = efx_mae_update_encap_md(efx, encap);
if (rc) {
netif_err(efx, drv, efx->net_dev,
"Failed to update encap hdr %08x rc %d\n",
encap->fw_id, rc);
return;
}
netif_dbg(efx, drv, efx->net_dev, "Updated encap hdr %08x\n",
encap->fw_id);
if (!encap->n_valid)
return;
/* Update rule users: use the action if they are now ready */
list_for_each_entry(act, &encap->users, encap_user) {
acts = act->user;
if (WARN_ON(!acts)) /* can't happen */
continue;
rule = container_of(acts, struct efx_tc_flow_rule, acts);
if (!efx_tc_check_ready(efx, rule))
continue;
rc = efx_mae_update_rule(efx, acts->fw_id, rule->fw_id);
if (rc)
netif_err(efx, drv, efx->net_dev,
"Failed to update rule %08x rc %d\n",
rule->fw_id, rc);
else
netif_dbg(efx, drv, efx->net_dev, "Updated rule %08x\n",
rule->fw_id);
}
}
static void efx_neigh_update(struct work_struct *work)
{
struct efx_neigh_binder *neigh = container_of(work, struct efx_neigh_binder, work);
struct efx_tc_encap_action *encap;
struct efx_nic *efx = neigh->efx;
mutex_lock(&efx->tc->mutex);
list_for_each_entry(encap, &neigh->users, list)
efx_tc_update_encap(neigh->efx, encap);
/* release ref taken in efx_neigh_event() */
if (refcount_dec_and_test(&neigh->ref))
efx_free_neigh(neigh);
mutex_unlock(&efx->tc->mutex);
}
static int efx_neigh_event(struct efx_nic *efx, struct neighbour *n)
{
struct efx_neigh_binder keys = {NULL}, *neigh;
bool n_valid, ipv6 = false;
char ha[ETH_ALEN];
size_t keysize;
if (WARN_ON(!efx->tc))
return NOTIFY_DONE;
if (n->tbl == &arp_tbl) {
keysize = sizeof(keys.dst_ip);
#if IS_ENABLED(CONFIG_IPV6)
} else if (n->tbl == ipv6_stub->nd_tbl) {
ipv6 = true;
keysize = sizeof(keys.dst_ip6);
#endif
} else {
return NOTIFY_DONE;
}
if (!n->parms) {
netif_warn(efx, drv, efx->net_dev, "neigh_event with no parms!\n");
return NOTIFY_DONE;
}
keys.net = read_pnet(&n->parms->net);
if (n->tbl->key_len != keysize) {
netif_warn(efx, drv, efx->net_dev, "neigh_event with bad key_len %u\n",
n->tbl->key_len);
return NOTIFY_DONE;
}
read_lock_bh(&n->lock); /* Get a consistent view */
memcpy(ha, n->ha, ETH_ALEN);
n_valid = (n->nud_state & NUD_VALID) && !n->dead;
read_unlock_bh(&n->lock);
if (ipv6)
memcpy(&keys.dst_ip6, n->primary_key, n->tbl->key_len);
else
memcpy(&keys.dst_ip, n->primary_key, n->tbl->key_len);
rcu_read_lock();
neigh = rhashtable_lookup_fast(&efx->tc->neigh_ht, &keys,
efx_neigh_ht_params);
if (!neigh || neigh->dying)
/* We're not interested in this neighbour */
goto done;
write_lock_bh(&neigh->lock);
if (n_valid == neigh->n_valid && !memcmp(ha, neigh->ha, ETH_ALEN)) {
write_unlock_bh(&neigh->lock);
/* Nothing has changed; no work to do */
goto done;
}
neigh->n_valid = n_valid;
memcpy(neigh->ha, ha, ETH_ALEN);
write_unlock_bh(&neigh->lock);
if (refcount_inc_not_zero(&neigh->ref)) {
rcu_read_unlock();
if (!schedule_work(&neigh->work))
/* failed to schedule, release the ref we just took */
if (refcount_dec_and_test(&neigh->ref))
efx_free_neigh(neigh);
} else {
done:
rcu_read_unlock();
}
return NOTIFY_DONE;
}
bool efx_tc_check_ready(struct efx_nic *efx, struct efx_tc_flow_rule *rule)
{
struct efx_tc_action_set *act;
/* Encap actions can only be offloaded if they have valid
* neighbour info for the outer Ethernet header.
*/
list_for_each_entry(act, &rule->acts.list, list)
if (act->encap_md && !act->encap_md->n_valid)
return false;
return true;
}
struct efx_tc_encap_action *efx_tc_flower_create_encap_md(
struct efx_nic *efx, const struct ip_tunnel_info *info,
struct net_device *egdev, struct netlink_ext_ack *extack)
{
enum efx_encap_type type = efx_tc_indr_netdev_type(egdev);
struct efx_tc_encap_action *encap, *old;
struct efx_rep *to_efv;
s64 rc;
if (type == EFX_ENCAP_TYPE_NONE) {
/* dest is not an encap device */
NL_SET_ERR_MSG_MOD(extack, "Not a (supported) tunnel device but tunnel_key is set");
return ERR_PTR(-EOPNOTSUPP);
}
rc = efx_mae_check_encap_type_supported(efx, type);
if (rc < 0) {
NL_SET_ERR_MSG_MOD(extack, "Firmware reports no support for this tunnel type");
return ERR_PTR(rc);
}
/* No support yet for Geneve options */
if (info->options_len) {
NL_SET_ERR_MSG_MOD(extack, "Unsupported tunnel options");
return ERR_PTR(-EOPNOTSUPP);
}
switch (info->mode) {
case IP_TUNNEL_INFO_TX:
break;
case IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6:
type |= EFX_ENCAP_FLAG_IPV6;
break;
default:
NL_SET_ERR_MSG_FMT_MOD(extack, "Unsupported tunnel mode %u",
info->mode);
return ERR_PTR(-EOPNOTSUPP);
}
encap = kzalloc(sizeof(*encap), GFP_KERNEL_ACCOUNT);
if (!encap)
return ERR_PTR(-ENOMEM);
encap->type = type;
encap->key = info->key;
INIT_LIST_HEAD(&encap->users);
old = rhashtable_lookup_get_insert_fast(&efx->tc->encap_ht,
&encap->linkage,
efx_tc_encap_ht_params);
if (old) {
/* don't need our new entry */
kfree(encap);
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_bind_neigh(efx, encap, dev_net(egdev), extack);
if (rc < 0)
goto out_remove;
to_efv = efx_tc_flower_lookup_efv(efx, encap->neigh->egdev);
if (IS_ERR(to_efv)) {
/* neigh->egdev isn't ours */
NL_SET_ERR_MSG_MOD(extack, "Tunnel egress device not on switch");
rc = PTR_ERR(to_efv);
goto out_release;
}
rc = efx_tc_flower_external_mport(efx, to_efv);
if (rc < 0) {
NL_SET_ERR_MSG_MOD(extack, "Failed to identify tunnel egress m-port");
goto out_release;
}
encap->dest_mport = rc;
read_lock_bh(&encap->neigh->lock);
efx_gen_encap_header(efx, encap);
read_unlock_bh(&encap->neigh->lock);
rc = efx_mae_allocate_encap_md(efx, encap);
if (rc < 0) {
NL_SET_ERR_MSG_MOD(extack, "Failed to write tunnel header to hw");
goto out_release;
}
/* ref and return */
refcount_set(&encap->ref, 1);
return encap;
out_release:
efx_release_neigh(efx, encap);
out_remove:
rhashtable_remove_fast(&efx->tc->encap_ht, &encap->linkage,
efx_tc_encap_ht_params);
kfree(encap);
return ERR_PTR(rc);
}
void efx_tc_flower_release_encap_md(struct efx_nic *efx,
struct efx_tc_encap_action *encap)
{
if (!refcount_dec_and_test(&encap->ref))
return; /* still in use */
efx_release_neigh(efx, encap);
rhashtable_remove_fast(&efx->tc->encap_ht, &encap->linkage,
efx_tc_encap_ht_params);
efx_mae_free_encap_md(efx, encap);
kfree(encap);
}
static void efx_tc_remove_neigh_users(struct efx_nic *efx, struct efx_neigh_binder *neigh)
{
struct efx_tc_encap_action *encap, *next;
list_for_each_entry_safe(encap, next, &neigh->users, list) {
/* Should cause neigh usage count to fall to zero, freeing it */
efx_release_neigh(efx, encap);
/* The encap has lost its neigh, so it's now unready */
efx_tc_update_encap(efx, encap);
}
}
void efx_tc_unregister_egdev(struct efx_nic *efx, struct net_device *net_dev)
{
struct efx_neigh_binder *neigh;
struct rhashtable_iter walk;
mutex_lock(&efx->tc->mutex);
rhashtable_walk_enter(&efx->tc->neigh_ht, &walk);
rhashtable_walk_start(&walk);
while ((neigh = rhashtable_walk_next(&walk)) != NULL) {
if (IS_ERR(neigh))
continue;
if (neigh->egdev != net_dev)
continue;
neigh->dying = true;
rhashtable_walk_stop(&walk);
synchronize_rcu(); /* Make sure any updates see dying flag */
efx_tc_remove_neigh_users(efx, neigh); /* might sleep */
rhashtable_walk_start(&walk);
}
rhashtable_walk_stop(&walk);
rhashtable_walk_exit(&walk);
mutex_unlock(&efx->tc->mutex);
}
int efx_tc_netevent_event(struct efx_nic *efx, unsigned long event,
void *ptr)
{
if (efx->type->is_vf)
return NOTIFY_DONE;
switch (event) {
case NETEVENT_NEIGH_UPDATE:
return efx_neigh_event(efx, ptr);
default:
return NOTIFY_DONE;
}
}
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