blob: 2258cd8cc84413f22c19a9339a3b6193427c464e [file] [log] [blame]
// SPDX-License-Identifier: (GPL-2.0 OR MIT)
/*
* Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.
* stmmac TC Handling (HW only)
*/
#include <net/pkt_cls.h>
#include <net/tc_act/tc_gact.h>
#include "common.h"
#include "dwmac4.h"
#include "dwmac5.h"
#include "stmmac.h"
static void tc_fill_all_pass_entry(struct stmmac_tc_entry *entry)
{
memset(entry, 0, sizeof(*entry));
entry->in_use = true;
entry->is_last = true;
entry->is_frag = false;
entry->prio = ~0x0;
entry->handle = 0;
entry->val.match_data = 0x0;
entry->val.match_en = 0x0;
entry->val.af = 1;
entry->val.dma_ch_no = 0x0;
}
static struct stmmac_tc_entry *tc_find_entry(struct stmmac_priv *priv,
struct tc_cls_u32_offload *cls,
bool free)
{
struct stmmac_tc_entry *entry, *first = NULL, *dup = NULL;
u32 loc = cls->knode.handle;
int i;
for (i = 0; i < priv->tc_entries_max; i++) {
entry = &priv->tc_entries[i];
if (!entry->in_use && !first && free)
first = entry;
if (entry->handle == loc && !free)
dup = entry;
}
if (dup)
return dup;
if (first) {
first->handle = loc;
first->in_use = true;
/* Reset HW values */
memset(&first->val, 0, sizeof(first->val));
}
return first;
}
static int tc_fill_actions(struct stmmac_tc_entry *entry,
struct stmmac_tc_entry *frag,
struct tc_cls_u32_offload *cls)
{
struct stmmac_tc_entry *action_entry = entry;
const struct tc_action *act;
struct tcf_exts *exts;
LIST_HEAD(actions);
exts = cls->knode.exts;
if (!tcf_exts_has_actions(exts))
return -EINVAL;
if (frag)
action_entry = frag;
tcf_exts_to_list(exts, &actions);
list_for_each_entry(act, &actions, list) {
/* Accept */
if (is_tcf_gact_ok(act)) {
action_entry->val.af = 1;
break;
}
/* Drop */
if (is_tcf_gact_shot(act)) {
action_entry->val.rf = 1;
break;
}
/* Unsupported */
return -EINVAL;
}
return 0;
}
static int tc_fill_entry(struct stmmac_priv *priv,
struct tc_cls_u32_offload *cls)
{
struct stmmac_tc_entry *entry, *frag = NULL;
struct tc_u32_sel *sel = cls->knode.sel;
u32 off, data, mask, real_off, rem;
u32 prio = cls->common.prio;
int ret;
/* Only 1 match per entry */
if (sel->nkeys <= 0 || sel->nkeys > 1)
return -EINVAL;
off = sel->keys[0].off << sel->offshift;
data = sel->keys[0].val;
mask = sel->keys[0].mask;
switch (ntohs(cls->common.protocol)) {
case ETH_P_ALL:
break;
case ETH_P_IP:
off += ETH_HLEN;
break;
default:
return -EINVAL;
}
if (off > priv->tc_off_max)
return -EINVAL;
real_off = off / 4;
rem = off % 4;
entry = tc_find_entry(priv, cls, true);
if (!entry)
return -EINVAL;
if (rem) {
frag = tc_find_entry(priv, cls, true);
if (!frag) {
ret = -EINVAL;
goto err_unuse;
}
entry->frag_ptr = frag;
entry->val.match_en = (mask << (rem * 8)) &
GENMASK(31, rem * 8);
entry->val.match_data = (data << (rem * 8)) &
GENMASK(31, rem * 8);
entry->val.frame_offset = real_off;
entry->prio = prio;
frag->val.match_en = (mask >> (rem * 8)) &
GENMASK(rem * 8 - 1, 0);
frag->val.match_data = (data >> (rem * 8)) &
GENMASK(rem * 8 - 1, 0);
frag->val.frame_offset = real_off + 1;
frag->prio = prio;
frag->is_frag = true;
} else {
entry->frag_ptr = NULL;
entry->val.match_en = mask;
entry->val.match_data = data;
entry->val.frame_offset = real_off;
entry->prio = prio;
}
ret = tc_fill_actions(entry, frag, cls);
if (ret)
goto err_unuse;
return 0;
err_unuse:
if (frag)
frag->in_use = false;
entry->in_use = false;
return ret;
}
static void tc_unfill_entry(struct stmmac_priv *priv,
struct tc_cls_u32_offload *cls)
{
struct stmmac_tc_entry *entry;
entry = tc_find_entry(priv, cls, false);
if (!entry)
return;
entry->in_use = false;
if (entry->frag_ptr) {
entry = entry->frag_ptr;
entry->is_frag = false;
entry->in_use = false;
}
}
static int tc_config_knode(struct stmmac_priv *priv,
struct tc_cls_u32_offload *cls)
{
int ret;
ret = tc_fill_entry(priv, cls);
if (ret)
return ret;
ret = stmmac_rxp_config(priv, priv->hw->pcsr, priv->tc_entries,
priv->tc_entries_max);
if (ret)
goto err_unfill;
return 0;
err_unfill:
tc_unfill_entry(priv, cls);
return ret;
}
static int tc_delete_knode(struct stmmac_priv *priv,
struct tc_cls_u32_offload *cls)
{
int ret;
/* Set entry and fragments as not used */
tc_unfill_entry(priv, cls);
ret = stmmac_rxp_config(priv, priv->hw->pcsr, priv->tc_entries,
priv->tc_entries_max);
if (ret)
return ret;
return 0;
}
static int tc_setup_cls_u32(struct stmmac_priv *priv,
struct tc_cls_u32_offload *cls)
{
switch (cls->command) {
case TC_CLSU32_REPLACE_KNODE:
tc_unfill_entry(priv, cls);
/* Fall through */
case TC_CLSU32_NEW_KNODE:
return tc_config_knode(priv, cls);
case TC_CLSU32_DELETE_KNODE:
return tc_delete_knode(priv, cls);
default:
return -EOPNOTSUPP;
}
}
static int tc_init(struct stmmac_priv *priv)
{
struct dma_features *dma_cap = &priv->dma_cap;
unsigned int count;
if (!dma_cap->frpsel)
return -EINVAL;
switch (dma_cap->frpbs) {
case 0x0:
priv->tc_off_max = 64;
break;
case 0x1:
priv->tc_off_max = 128;
break;
case 0x2:
priv->tc_off_max = 256;
break;
default:
return -EINVAL;
}
switch (dma_cap->frpes) {
case 0x0:
count = 64;
break;
case 0x1:
count = 128;
break;
case 0x2:
count = 256;
break;
default:
return -EINVAL;
}
/* Reserve one last filter which lets all pass */
priv->tc_entries_max = count;
priv->tc_entries = devm_kcalloc(priv->device,
count, sizeof(*priv->tc_entries), GFP_KERNEL);
if (!priv->tc_entries)
return -ENOMEM;
tc_fill_all_pass_entry(&priv->tc_entries[count - 1]);
dev_info(priv->device, "Enabling HW TC (entries=%d, max_off=%d)\n",
priv->tc_entries_max, priv->tc_off_max);
return 0;
}
const struct stmmac_tc_ops dwmac510_tc_ops = {
.init = tc_init,
.setup_cls_u32 = tc_setup_cls_u32,
};