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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2015-2018 Netronome Systems, Inc. */
#include <linux/bitfield.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/workqueue.h>
#include <net/dst_metadata.h>
#include "main.h"
#include "../nfp_net.h"
#include "../nfp_net_repr.h"
#include "./cmsg.h"
static struct nfp_flower_cmsg_hdr *
nfp_flower_cmsg_get_hdr(struct sk_buff *skb)
{
return (struct nfp_flower_cmsg_hdr *)skb->data;
}
struct sk_buff *
nfp_flower_cmsg_alloc(struct nfp_app *app, unsigned int size,
enum nfp_flower_cmsg_type_port type, gfp_t flag)
{
struct nfp_flower_cmsg_hdr *ch;
struct sk_buff *skb;
size += NFP_FLOWER_CMSG_HLEN;
skb = nfp_app_ctrl_msg_alloc(app, size, flag);
if (!skb)
return NULL;
ch = nfp_flower_cmsg_get_hdr(skb);
ch->pad = 0;
ch->version = NFP_FLOWER_CMSG_VER1;
ch->type = type;
skb_put(skb, size);
return skb;
}
struct sk_buff *
nfp_flower_cmsg_mac_repr_start(struct nfp_app *app, unsigned int num_ports)
{
struct nfp_flower_cmsg_mac_repr *msg;
struct sk_buff *skb;
skb = nfp_flower_cmsg_alloc(app, struct_size(msg, ports, num_ports),
NFP_FLOWER_CMSG_TYPE_MAC_REPR, GFP_KERNEL);
if (!skb)
return NULL;
msg = nfp_flower_cmsg_get_data(skb);
memset(msg->reserved, 0, sizeof(msg->reserved));
msg->num_ports = num_ports;
return skb;
}
void
nfp_flower_cmsg_mac_repr_add(struct sk_buff *skb, unsigned int idx,
unsigned int nbi, unsigned int nbi_port,
unsigned int phys_port)
{
struct nfp_flower_cmsg_mac_repr *msg;
msg = nfp_flower_cmsg_get_data(skb);
msg->ports[idx].idx = idx;
msg->ports[idx].info = nbi & NFP_FLOWER_CMSG_MAC_REPR_NBI;
msg->ports[idx].nbi_port = nbi_port;
msg->ports[idx].phys_port = phys_port;
}
int nfp_flower_cmsg_portmod(struct nfp_repr *repr, bool carrier_ok,
unsigned int mtu, bool mtu_only)
{
struct nfp_flower_cmsg_portmod *msg;
struct sk_buff *skb;
skb = nfp_flower_cmsg_alloc(repr->app, sizeof(*msg),
NFP_FLOWER_CMSG_TYPE_PORT_MOD, GFP_KERNEL);
if (!skb)
return -ENOMEM;
msg = nfp_flower_cmsg_get_data(skb);
msg->portnum = cpu_to_be32(repr->dst->u.port_info.port_id);
msg->reserved = 0;
msg->info = carrier_ok;
if (mtu_only)
msg->info |= NFP_FLOWER_CMSG_PORTMOD_MTU_CHANGE_ONLY;
msg->mtu = cpu_to_be16(mtu);
nfp_ctrl_tx(repr->app->ctrl, skb);
return 0;
}
int nfp_flower_cmsg_portreify(struct nfp_repr *repr, bool exists)
{
struct nfp_flower_cmsg_portreify *msg;
struct sk_buff *skb;
skb = nfp_flower_cmsg_alloc(repr->app, sizeof(*msg),
NFP_FLOWER_CMSG_TYPE_PORT_REIFY,
GFP_KERNEL);
if (!skb)
return -ENOMEM;
msg = nfp_flower_cmsg_get_data(skb);
msg->portnum = cpu_to_be32(repr->dst->u.port_info.port_id);
msg->reserved = 0;
msg->info = cpu_to_be16(exists);
nfp_ctrl_tx(repr->app->ctrl, skb);
return 0;
}
static bool
nfp_flower_process_mtu_ack(struct nfp_app *app, struct sk_buff *skb)
{
struct nfp_flower_priv *app_priv = app->priv;
struct nfp_flower_cmsg_portmod *msg;
msg = nfp_flower_cmsg_get_data(skb);
if (!(msg->info & NFP_FLOWER_CMSG_PORTMOD_MTU_CHANGE_ONLY))
return false;
spin_lock_bh(&app_priv->mtu_conf.lock);
if (!app_priv->mtu_conf.requested_val ||
app_priv->mtu_conf.portnum != be32_to_cpu(msg->portnum) ||
be16_to_cpu(msg->mtu) != app_priv->mtu_conf.requested_val) {
/* Not an ack for requested MTU change. */
spin_unlock_bh(&app_priv->mtu_conf.lock);
return false;
}
app_priv->mtu_conf.ack = true;
app_priv->mtu_conf.requested_val = 0;
wake_up(&app_priv->mtu_conf.wait_q);
spin_unlock_bh(&app_priv->mtu_conf.lock);
return true;
}
static void
nfp_flower_cmsg_portmod_rx(struct nfp_app *app, struct sk_buff *skb)
{
struct nfp_flower_cmsg_portmod *msg;
struct net_device *netdev;
bool link;
msg = nfp_flower_cmsg_get_data(skb);
link = msg->info & NFP_FLOWER_CMSG_PORTMOD_INFO_LINK;
rtnl_lock();
rcu_read_lock();
netdev = nfp_app_repr_get(app, be32_to_cpu(msg->portnum));
rcu_read_unlock();
if (!netdev) {
nfp_flower_cmsg_warn(app, "ctrl msg for unknown port 0x%08x\n",
be32_to_cpu(msg->portnum));
rtnl_unlock();
return;
}
if (link) {
u16 mtu = be16_to_cpu(msg->mtu);
netif_carrier_on(netdev);
/* An MTU of 0 from the firmware should be ignored */
if (mtu)
dev_set_mtu(netdev, mtu);
} else {
netif_carrier_off(netdev);
}
rtnl_unlock();
}
static void
nfp_flower_cmsg_portreify_rx(struct nfp_app *app, struct sk_buff *skb)
{
struct nfp_flower_priv *priv = app->priv;
struct nfp_flower_cmsg_portreify *msg;
bool exists;
msg = nfp_flower_cmsg_get_data(skb);
rcu_read_lock();
exists = !!nfp_app_repr_get(app, be32_to_cpu(msg->portnum));
rcu_read_unlock();
if (!exists) {
nfp_flower_cmsg_warn(app, "ctrl msg for unknown port 0x%08x\n",
be32_to_cpu(msg->portnum));
return;
}
atomic_inc(&priv->reify_replies);
wake_up(&priv->reify_wait_queue);
}
static void
nfp_flower_cmsg_process_one_rx(struct nfp_app *app, struct sk_buff *skb)
{
struct nfp_flower_priv *app_priv = app->priv;
struct nfp_flower_cmsg_hdr *cmsg_hdr;
enum nfp_flower_cmsg_type_port type;
bool skb_stored = false;
cmsg_hdr = nfp_flower_cmsg_get_hdr(skb);
type = cmsg_hdr->type;
switch (type) {
case NFP_FLOWER_CMSG_TYPE_PORT_REIFY:
nfp_flower_cmsg_portreify_rx(app, skb);
break;
case NFP_FLOWER_CMSG_TYPE_PORT_MOD:
nfp_flower_cmsg_portmod_rx(app, skb);
break;
case NFP_FLOWER_CMSG_TYPE_NO_NEIGH:
nfp_tunnel_request_route(app, skb);
break;
case NFP_FLOWER_CMSG_TYPE_ACTIVE_TUNS:
nfp_tunnel_keep_alive(app, skb);
break;
case NFP_FLOWER_CMSG_TYPE_LAG_CONFIG:
if (app_priv->flower_ext_feats & NFP_FL_FEATS_LAG) {
skb_stored = nfp_flower_lag_unprocessed_msg(app, skb);
break;
}
/* fall through */
default:
nfp_flower_cmsg_warn(app, "Cannot handle invalid repr control type %u\n",
type);
goto out;
}
if (!skb_stored)
dev_consume_skb_any(skb);
return;
out:
dev_kfree_skb_any(skb);
}
void nfp_flower_cmsg_process_rx(struct work_struct *work)
{
struct sk_buff_head cmsg_joined;
struct nfp_flower_priv *priv;
struct sk_buff *skb;
priv = container_of(work, struct nfp_flower_priv, cmsg_work);
skb_queue_head_init(&cmsg_joined);
spin_lock_bh(&priv->cmsg_skbs_high.lock);
skb_queue_splice_tail_init(&priv->cmsg_skbs_high, &cmsg_joined);
spin_unlock_bh(&priv->cmsg_skbs_high.lock);
spin_lock_bh(&priv->cmsg_skbs_low.lock);
skb_queue_splice_tail_init(&priv->cmsg_skbs_low, &cmsg_joined);
spin_unlock_bh(&priv->cmsg_skbs_low.lock);
while ((skb = __skb_dequeue(&cmsg_joined)))
nfp_flower_cmsg_process_one_rx(priv->app, skb);
}
static void
nfp_flower_queue_ctl_msg(struct nfp_app *app, struct sk_buff *skb, int type)
{
struct nfp_flower_priv *priv = app->priv;
struct sk_buff_head *skb_head;
if (type == NFP_FLOWER_CMSG_TYPE_PORT_REIFY ||
type == NFP_FLOWER_CMSG_TYPE_PORT_MOD)
skb_head = &priv->cmsg_skbs_high;
else
skb_head = &priv->cmsg_skbs_low;
if (skb_queue_len(skb_head) >= NFP_FLOWER_WORKQ_MAX_SKBS) {
nfp_flower_cmsg_warn(app, "Dropping queued control messages\n");
dev_kfree_skb_any(skb);
return;
}
skb_queue_tail(skb_head, skb);
schedule_work(&priv->cmsg_work);
}
void nfp_flower_cmsg_rx(struct nfp_app *app, struct sk_buff *skb)
{
struct nfp_flower_cmsg_hdr *cmsg_hdr;
cmsg_hdr = nfp_flower_cmsg_get_hdr(skb);
if (unlikely(cmsg_hdr->version != NFP_FLOWER_CMSG_VER1)) {
nfp_flower_cmsg_warn(app, "Cannot handle repr control version %u\n",
cmsg_hdr->version);
dev_kfree_skb_any(skb);
return;
}
if (cmsg_hdr->type == NFP_FLOWER_CMSG_TYPE_FLOW_STATS) {
/* We need to deal with stats updates from HW asap */
nfp_flower_rx_flow_stats(app, skb);
dev_consume_skb_any(skb);
} else if (cmsg_hdr->type == NFP_FLOWER_CMSG_TYPE_PORT_MOD &&
nfp_flower_process_mtu_ack(app, skb)) {
/* Handle MTU acks outside wq to prevent RTNL conflict. */
dev_consume_skb_any(skb);
} else if (cmsg_hdr->type == NFP_FLOWER_CMSG_TYPE_TUN_NEIGH) {
/* Acks from the NFP that the route is added - ignore. */
dev_consume_skb_any(skb);
} else {
nfp_flower_queue_ctl_msg(app, skb, cmsg_hdr->type);
}
}
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