// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2018 Netronome Systems, Inc. */
#include <linux/bitfield.h>
#include <net/pkt_cls.h>
#include "../nfpcore/nfp_cpp.h"
#include "../nfp_app.h"
#include "../nfp_net_repr.h"
#include "main.h"
struct nfp_abm_u32_match {
u32 handle;
u32 band;
u8 mask;
u8 val;
struct list_head list;
};
static bool
nfp_abm_u32_check_knode(struct nfp_abm *abm, struct tc_cls_u32_knode *knode,
__be16 proto, struct netlink_ext_ack *extack)
{
struct tc_u32_key *k;
unsigned int tos_off;
if (knode->exts && tcf_exts_has_actions(knode->exts)) {
NL_SET_ERR_MSG_MOD(extack, "action offload not supported");
return false;
}
if (knode->link_handle) {
NL_SET_ERR_MSG_MOD(extack, "linking not supported");
return false;
}
if (knode->sel->flags != TC_U32_TERMINAL) {
NL_SET_ERR_MSG_MOD(extack,
"flags must be equal to TC_U32_TERMINAL");
return false;
}
if (knode->sel->off || knode->sel->offshift || knode->sel->offmask ||
knode->sel->offoff || knode->fshift) {
NL_SET_ERR_MSG_MOD(extack, "variable offsetting not supported");
return false;
}
if (knode->sel->hoff || knode->sel->hmask) {
NL_SET_ERR_MSG_MOD(extack, "hashing not supported");
return false;
}
if (knode->val || knode->mask) {
NL_SET_ERR_MSG_MOD(extack, "matching on mark not supported");
return false;
}
if (knode->res && knode->res->class) {
NL_SET_ERR_MSG_MOD(extack, "setting non-0 class not supported");
return false;
}
if (knode->res && knode->res->classid >= abm->num_bands) {
NL_SET_ERR_MSG_MOD(extack,
"classid higher than number of bands");
return false;
}
if (knode->sel->nkeys != 1) {
NL_SET_ERR_MSG_MOD(extack, "exactly one key required");
return false;
}
switch (proto) {
case htons(ETH_P_IP):
tos_off = 16;
break;
case htons(ETH_P_IPV6):
tos_off = 20;
break;
default:
NL_SET_ERR_MSG_MOD(extack, "only IP and IPv6 supported as filter protocol");
return false;
}
k = &knode->sel->keys[0];
if (k->offmask) {
NL_SET_ERR_MSG_MOD(extack, "offset mask - variable offsetting not supported");
return false;
}
if (k->off) {
NL_SET_ERR_MSG_MOD(extack, "only DSCP fields can be matched");
return false;
}
if (k->val & ~k->mask) {
NL_SET_ERR_MSG_MOD(extack, "mask does not cover the key");
return false;
}
if (be32_to_cpu(k->mask) >> tos_off & ~abm->dscp_mask) {
NL_SET_ERR_MSG_MOD(extack, "only high DSCP class selector bits can be used");
nfp_err(abm->app->cpp,
"u32 offload: requested mask %x FW can support only %x\n",
be32_to_cpu(k->mask) >> tos_off, abm->dscp_mask);
return false;
}
return true;
}
/* This filter list -> map conversion is O(n * m), we expect single digit or
* low double digit number of prios and likewise for the filters. Also u32
* doesn't report stats, so it's really only setup time cost.
*/
static unsigned int
nfp_abm_find_band_for_prio(struct nfp_abm_link *alink, unsigned int prio)
{
struct nfp_abm_u32_match *iter;
list_for_each_entry(iter, &alink->dscp_map, list)
if ((prio & iter->mask) == iter->val)
return iter->band;
return alink->def_band;
}
static int nfp_abm_update_band_map(struct nfp_abm_link *alink)
{
unsigned int i, bits_per_prio, prios_per_word, base_shift;
struct nfp_abm *abm = alink->abm;
u32 field_mask;
alink->has_prio = !list_empty(&alink->dscp_map);
bits_per_prio = roundup_pow_of_two(order_base_2(abm->num_bands));
field_mask = (1 << bits_per_prio) - 1;
prios_per_word = sizeof(u32) * BITS_PER_BYTE / bits_per_prio;
/* FW mask applies from top bits */
base_shift = 8 - order_base_2(abm->num_prios);
for (i = 0; i < abm->num_prios; i++) {
unsigned int offset;
u32 *word;
u8 band;
word = &alink->prio_map[i / prios_per_word];
offset = (i % prios_per_word) * bits_per_prio;
band = nfp_abm_find_band_for_prio(alink, i << base_shift);
*word &= ~(field_mask << offset);
*word |= band << offset;
}
/* Qdisc offload status may change if has_prio changed */
nfp_abm_qdisc_offload_update(alink);
return nfp_abm_ctrl_prio_map_update(alink, alink->prio_map);
}
static void
nfp_abm_u32_knode_delete(struct nfp_abm_link *alink,
struct tc_cls_u32_knode *knode)
{
struct nfp_abm_u32_match *iter;
list_for_each_entry(iter, &alink->dscp_map, list)
if (iter->handle == knode->handle) {
list_del(&iter->list);
kfree(iter);
nfp_abm_update_band_map(alink);
return;
}
}
static int
nfp_abm_u32_knode_replace(struct nfp_abm_link *alink,
struct tc_cls_u32_knode *knode,
__be16 proto, struct netlink_ext_ack *extack)
{
struct nfp_abm_u32_match *match = NULL, *iter;
unsigned int tos_off;
u8 mask, val;
int err;
if (!nfp_abm_u32_check_knode(alink->abm, knode, proto, extack))
goto err_delete;
tos_off = proto == htons(ETH_P_IP) ? 16 : 20;
/* Extract the DSCP Class Selector bits */
val = be32_to_cpu(knode->sel->keys[0].val) >> tos_off & 0xff;
mask = be32_to_cpu(knode->sel->keys[0].mask) >> tos_off & 0xff;
/* Check if there is no conflicting mapping and find match by handle */
list_for_each_entry(iter, &alink->dscp_map, list) {
u32 cmask;
if (iter->handle == knode->handle) {
match = iter;
continue;
}
cmask = iter->mask & mask;
if ((iter->val & cmask) == (val & cmask) &&
iter->band != knode->res->classid) {
NL_SET_ERR_MSG_MOD(extack, "conflict with already offloaded filter");
goto err_delete;
}
}
if (!match) {
match = kzalloc(sizeof(*match), GFP_KERNEL);
if (!match)
return -ENOMEM;
list_add(&match->list, &alink->dscp_map);
}
match->handle = knode->handle;
match->band = knode->res->classid;
match->mask = mask;
match->val = val;
err = nfp_abm_update_band_map(alink);
if (err)
goto err_delete;
return 0;
err_delete:
nfp_abm_u32_knode_delete(alink, knode);
return -EOPNOTSUPP;
}
static int nfp_abm_setup_tc_block_cb(enum tc_setup_type type,
void *type_data, void *cb_priv)
{
struct tc_cls_u32_offload *cls_u32 = type_data;
struct nfp_repr *repr = cb_priv;
struct nfp_abm_link *alink;
alink = repr->app_priv;
if (type != TC_SETUP_CLSU32) {
NL_SET_ERR_MSG_MOD(cls_u32->common.extack,
"only offload of u32 classifier supported");
return -EOPNOTSUPP;
}
if (!tc_cls_can_offload_and_chain0(repr->netdev, &cls_u32->common))
return -EOPNOTSUPP;
if (cls_u32->common.protocol != htons(ETH_P_IP) &&
cls_u32->common.protocol != htons(ETH_P_IPV6)) {
NL_SET_ERR_MSG_MOD(cls_u32->common.extack,
"only IP and IPv6 supported as filter protocol");
return -EOPNOTSUPP;
}
switch (cls_u32->command) {
case TC_CLSU32_NEW_KNODE:
case TC_CLSU32_REPLACE_KNODE:
return nfp_abm_u32_knode_replace(alink, &cls_u32->knode,
cls_u32->common.protocol,
cls_u32->common.extack);
case TC_CLSU32_DELETE_KNODE:
nfp_abm_u32_knode_delete(alink, &cls_u32->knode);
return 0;
default:
return -EOPNOTSUPP;
}
}
static LIST_HEAD(nfp_abm_block_cb_list);
int nfp_abm_setup_cls_block(struct net_device *netdev, struct nfp_repr *repr,
struct flow_block_offload *f)
{
return flow_block_cb_setup_simple(f, &nfp_abm_block_cb_list,
nfp_abm_setup_tc_block_cb,
repr, repr, true);
}
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