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/*
* Copyright (C) 2017 Netronome Systems, Inc.
*
* This software is dual licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
* source tree or the BSD 2-Clause License provided below. You have the
* option to license this software under the complete terms of either license.
*
* The BSD 2-Clause License:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/hash.h>
#include <linux/hashtable.h>
#include <linux/jhash.h>
#include <linux/vmalloc.h>
#include <net/pkt_cls.h>
#include "cmsg.h"
#include "main.h"
#include "../nfp_app.h"
struct nfp_mask_id_table {
struct hlist_node link;
u32 hash_key;
u32 ref_cnt;
u8 mask_id;
};
static int nfp_release_stats_entry(struct nfp_app *app, u32 stats_context_id)
{
struct nfp_flower_priv *priv = app->priv;
struct circ_buf *ring;
ring = &priv->stats_ids.free_list;
/* Check if buffer is full. */
if (!CIRC_SPACE(ring->head, ring->tail, NFP_FL_STATS_ENTRY_RS *
NFP_FL_STATS_ELEM_RS -
NFP_FL_STATS_ELEM_RS + 1))
return -ENOBUFS;
memcpy(&ring->buf[ring->head], &stats_context_id, NFP_FL_STATS_ELEM_RS);
ring->head = (ring->head + NFP_FL_STATS_ELEM_RS) %
(NFP_FL_STATS_ENTRY_RS * NFP_FL_STATS_ELEM_RS);
return 0;
}
static int nfp_get_stats_entry(struct nfp_app *app, u32 *stats_context_id)
{
struct nfp_flower_priv *priv = app->priv;
u32 freed_stats_id, temp_stats_id;
struct circ_buf *ring;
ring = &priv->stats_ids.free_list;
freed_stats_id = NFP_FL_STATS_ENTRY_RS;
/* Check for unallocated entries first. */
if (priv->stats_ids.init_unalloc > 0) {
*stats_context_id = priv->stats_ids.init_unalloc - 1;
priv->stats_ids.init_unalloc--;
return 0;
}
/* Check if buffer is empty. */
if (ring->head == ring->tail) {
*stats_context_id = freed_stats_id;
return -ENOENT;
}
memcpy(&temp_stats_id, &ring->buf[ring->tail], NFP_FL_STATS_ELEM_RS);
*stats_context_id = temp_stats_id;
memcpy(&ring->buf[ring->tail], &freed_stats_id, NFP_FL_STATS_ELEM_RS);
ring->tail = (ring->tail + NFP_FL_STATS_ELEM_RS) %
(NFP_FL_STATS_ENTRY_RS * NFP_FL_STATS_ELEM_RS);
return 0;
}
/* Must be called with either RTNL or rcu_read_lock */
struct nfp_fl_payload *
nfp_flower_search_fl_table(struct nfp_app *app, unsigned long tc_flower_cookie)
{
struct nfp_flower_priv *priv = app->priv;
struct nfp_fl_payload *flower_entry;
hash_for_each_possible_rcu(priv->flow_table, flower_entry, link,
tc_flower_cookie)
if (flower_entry->tc_flower_cookie == tc_flower_cookie)
return flower_entry;
return NULL;
}
static void
nfp_flower_update_stats(struct nfp_app *app, struct nfp_fl_stats_frame *stats)
{
struct nfp_fl_payload *nfp_flow;
unsigned long flower_cookie;
flower_cookie = be64_to_cpu(stats->stats_cookie);
rcu_read_lock();
nfp_flow = nfp_flower_search_fl_table(app, flower_cookie);
if (!nfp_flow)
goto exit_rcu_unlock;
if (nfp_flow->meta.host_ctx_id != stats->stats_con_id)
goto exit_rcu_unlock;
spin_lock(&nfp_flow->lock);
nfp_flow->stats.pkts += be32_to_cpu(stats->pkt_count);
nfp_flow->stats.bytes += be64_to_cpu(stats->byte_count);
nfp_flow->stats.used = jiffies;
spin_unlock(&nfp_flow->lock);
exit_rcu_unlock:
rcu_read_unlock();
}
void nfp_flower_rx_flow_stats(struct nfp_app *app, struct sk_buff *skb)
{
unsigned int msg_len = skb->len - NFP_FLOWER_CMSG_HLEN;
struct nfp_fl_stats_frame *stats_frame;
unsigned char *msg;
int i;
msg = nfp_flower_cmsg_get_data(skb);
stats_frame = (struct nfp_fl_stats_frame *)msg;
for (i = 0; i < msg_len / sizeof(*stats_frame); i++)
nfp_flower_update_stats(app, stats_frame + i);
}
static int nfp_release_mask_id(struct nfp_app *app, u8 mask_id)
{
struct nfp_flower_priv *priv = app->priv;
struct circ_buf *ring;
struct timespec64 now;
ring = &priv->mask_ids.mask_id_free_list;
/* Checking if buffer is full. */
if (CIRC_SPACE(ring->head, ring->tail, NFP_FLOWER_MASK_ENTRY_RS) == 0)
return -ENOBUFS;
memcpy(&ring->buf[ring->head], &mask_id, NFP_FLOWER_MASK_ELEMENT_RS);
ring->head = (ring->head + NFP_FLOWER_MASK_ELEMENT_RS) %
(NFP_FLOWER_MASK_ENTRY_RS * NFP_FLOWER_MASK_ELEMENT_RS);
getnstimeofday64(&now);
priv->mask_ids.last_used[mask_id] = now;
return 0;
}
static int nfp_mask_alloc(struct nfp_app *app, u8 *mask_id)
{
struct nfp_flower_priv *priv = app->priv;
struct timespec64 delta, now;
struct circ_buf *ring;
u8 temp_id, freed_id;
ring = &priv->mask_ids.mask_id_free_list;
freed_id = NFP_FLOWER_MASK_ENTRY_RS - 1;
/* Checking for unallocated entries first. */
if (priv->mask_ids.init_unallocated > 0) {
*mask_id = priv->mask_ids.init_unallocated;
priv->mask_ids.init_unallocated--;
return 0;
}
/* Checking if buffer is empty. */
if (ring->head == ring->tail)
goto err_not_found;
memcpy(&temp_id, &ring->buf[ring->tail], NFP_FLOWER_MASK_ELEMENT_RS);
*mask_id = temp_id;
getnstimeofday64(&now);
delta = timespec64_sub(now, priv->mask_ids.last_used[*mask_id]);
if (timespec64_to_ns(&delta) < NFP_FL_MASK_REUSE_TIME_NS)
goto err_not_found;
memcpy(&ring->buf[ring->tail], &freed_id, NFP_FLOWER_MASK_ELEMENT_RS);
ring->tail = (ring->tail + NFP_FLOWER_MASK_ELEMENT_RS) %
(NFP_FLOWER_MASK_ENTRY_RS * NFP_FLOWER_MASK_ELEMENT_RS);
return 0;
err_not_found:
*mask_id = freed_id;
return -ENOENT;
}
static int
nfp_add_mask_table(struct nfp_app *app, char *mask_data, u32 mask_len)
{
struct nfp_flower_priv *priv = app->priv;
struct nfp_mask_id_table *mask_entry;
unsigned long hash_key;
u8 mask_id;
if (nfp_mask_alloc(app, &mask_id))
return -ENOENT;
mask_entry = kmalloc(sizeof(*mask_entry), GFP_KERNEL);
if (!mask_entry) {
nfp_release_mask_id(app, mask_id);
return -ENOMEM;
}
INIT_HLIST_NODE(&mask_entry->link);
mask_entry->mask_id = mask_id;
hash_key = jhash(mask_data, mask_len, priv->mask_id_seed);
mask_entry->hash_key = hash_key;
mask_entry->ref_cnt = 1;
hash_add(priv->mask_table, &mask_entry->link, hash_key);
return mask_id;
}
static struct nfp_mask_id_table *
nfp_search_mask_table(struct nfp_app *app, char *mask_data, u32 mask_len)
{
struct nfp_flower_priv *priv = app->priv;
struct nfp_mask_id_table *mask_entry;
unsigned long hash_key;
hash_key = jhash(mask_data, mask_len, priv->mask_id_seed);
hash_for_each_possible(priv->mask_table, mask_entry, link, hash_key)
if (mask_entry->hash_key == hash_key)
return mask_entry;
return NULL;
}
static int
nfp_find_in_mask_table(struct nfp_app *app, char *mask_data, u32 mask_len)
{
struct nfp_mask_id_table *mask_entry;
mask_entry = nfp_search_mask_table(app, mask_data, mask_len);
if (!mask_entry)
return -ENOENT;
mask_entry->ref_cnt++;
/* Casting u8 to int for later use. */
return mask_entry->mask_id;
}
static bool
nfp_check_mask_add(struct nfp_app *app, char *mask_data, u32 mask_len,
u8 *meta_flags, u8 *mask_id)
{
int id;
id = nfp_find_in_mask_table(app, mask_data, mask_len);
if (id < 0) {
id = nfp_add_mask_table(app, mask_data, mask_len);
if (id < 0)
return false;
*meta_flags |= NFP_FL_META_FLAG_NEW_MASK;
}
*mask_id = id;
return true;
}
static bool
nfp_check_mask_remove(struct nfp_app *app, char *mask_data, u32 mask_len,
u8 *meta_flags, u8 *mask_id)
{
struct nfp_mask_id_table *mask_entry;
mask_entry = nfp_search_mask_table(app, mask_data, mask_len);
if (!mask_entry)
return false;
*mask_id = mask_entry->mask_id;
mask_entry->ref_cnt--;
if (!mask_entry->ref_cnt) {
hash_del(&mask_entry->link);
nfp_release_mask_id(app, *mask_id);
kfree(mask_entry);
if (meta_flags)
*meta_flags |= NFP_FL_META_FLAG_LAST_MASK;
}
return true;
}
int nfp_compile_flow_metadata(struct nfp_app *app,
struct tc_cls_flower_offload *flow,
struct nfp_fl_payload *nfp_flow)
{
struct nfp_flower_priv *priv = app->priv;
struct nfp_fl_payload *check_entry;
u8 new_mask_id;
u32 stats_cxt;
if (nfp_get_stats_entry(app, &stats_cxt))
return -ENOENT;
nfp_flow->meta.host_ctx_id = cpu_to_be32(stats_cxt);
nfp_flow->meta.host_cookie = cpu_to_be64(flow->cookie);
new_mask_id = 0;
if (!nfp_check_mask_add(app, nfp_flow->mask_data,
nfp_flow->meta.mask_len,
&nfp_flow->meta.flags, &new_mask_id)) {
if (nfp_release_stats_entry(app, stats_cxt))
return -EINVAL;
return -ENOENT;
}
nfp_flow->meta.flow_version = cpu_to_be64(priv->flower_version);
priv->flower_version++;
/* Update flow payload with mask ids. */
nfp_flow->unmasked_data[NFP_FL_MASK_ID_LOCATION] = new_mask_id;
nfp_flow->stats.pkts = 0;
nfp_flow->stats.bytes = 0;
nfp_flow->stats.used = jiffies;
check_entry = nfp_flower_search_fl_table(app, flow->cookie);
if (check_entry) {
if (nfp_release_stats_entry(app, stats_cxt))
return -EINVAL;
if (!nfp_check_mask_remove(app, nfp_flow->mask_data,
nfp_flow->meta.mask_len,
NULL, &new_mask_id))
return -EINVAL;
return -EEXIST;
}
return 0;
}
int nfp_modify_flow_metadata(struct nfp_app *app,
struct nfp_fl_payload *nfp_flow)
{
struct nfp_flower_priv *priv = app->priv;
u8 new_mask_id = 0;
u32 temp_ctx_id;
nfp_check_mask_remove(app, nfp_flow->mask_data,
nfp_flow->meta.mask_len, &nfp_flow->meta.flags,
&new_mask_id);
nfp_flow->meta.flow_version = cpu_to_be64(priv->flower_version);
priv->flower_version++;
/* Update flow payload with mask ids. */
nfp_flow->unmasked_data[NFP_FL_MASK_ID_LOCATION] = new_mask_id;
/* Release the stats ctx id. */
temp_ctx_id = be32_to_cpu(nfp_flow->meta.host_ctx_id);
return nfp_release_stats_entry(app, temp_ctx_id);
}
int nfp_flower_metadata_init(struct nfp_app *app)
{
struct nfp_flower_priv *priv = app->priv;
hash_init(priv->mask_table);
hash_init(priv->flow_table);
get_random_bytes(&priv->mask_id_seed, sizeof(priv->mask_id_seed));
/* Init ring buffer and unallocated mask_ids. */
priv->mask_ids.mask_id_free_list.buf =
kmalloc_array(NFP_FLOWER_MASK_ENTRY_RS,
NFP_FLOWER_MASK_ELEMENT_RS, GFP_KERNEL);
if (!priv->mask_ids.mask_id_free_list.buf)
return -ENOMEM;
priv->mask_ids.init_unallocated = NFP_FLOWER_MASK_ENTRY_RS - 1;
/* Init timestamps for mask id*/
priv->mask_ids.last_used =
kmalloc_array(NFP_FLOWER_MASK_ENTRY_RS,
sizeof(*priv->mask_ids.last_used), GFP_KERNEL);
if (!priv->mask_ids.last_used)
goto err_free_mask_id;
/* Init ring buffer and unallocated stats_ids. */
priv->stats_ids.free_list.buf =
vmalloc(NFP_FL_STATS_ENTRY_RS * NFP_FL_STATS_ELEM_RS);
if (!priv->stats_ids.free_list.buf)
goto err_free_last_used;
priv->stats_ids.init_unalloc = NFP_FL_REPEATED_HASH_MAX;
return 0;
err_free_last_used:
kfree(priv->mask_ids.last_used);
err_free_mask_id:
kfree(priv->mask_ids.mask_id_free_list.buf);
return -ENOMEM;
}
void nfp_flower_metadata_cleanup(struct nfp_app *app)
{
struct nfp_flower_priv *priv = app->priv;
if (!priv)
return;
kfree(priv->mask_ids.mask_id_free_list.buf);
kfree(priv->mask_ids.last_used);
vfree(priv->stats_ids.free_list.buf);
}