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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (C) 2019 Chelsio Communications. All rights reserved. */
#include "cxgb4.h"
#include "cxgb4_tc_matchall.h"
#include "sched.h"
static int cxgb4_matchall_egress_validate(struct net_device *dev,
struct tc_cls_matchall_offload *cls)
{
struct netlink_ext_ack *extack = cls->common.extack;
struct flow_action *actions = &cls->rule->action;
struct port_info *pi = netdev2pinfo(dev);
struct flow_action_entry *entry;
u64 max_link_rate;
u32 i, speed;
int ret;
if (!flow_action_has_entries(actions)) {
NL_SET_ERR_MSG_MOD(extack,
"Egress MATCHALL offload needs at least 1 policing action");
return -EINVAL;
} else if (!flow_offload_has_one_action(actions)) {
NL_SET_ERR_MSG_MOD(extack,
"Egress MATCHALL offload only supports 1 policing action");
return -EINVAL;
} else if (pi->tc_block_shared) {
NL_SET_ERR_MSG_MOD(extack,
"Egress MATCHALL offload not supported with shared blocks");
return -EINVAL;
}
ret = t4_get_link_params(pi, NULL, &speed, NULL);
if (ret) {
NL_SET_ERR_MSG_MOD(extack,
"Failed to get max speed supported by the link");
return -EINVAL;
}
/* Convert from Mbps to bps */
max_link_rate = (u64)speed * 1000 * 1000;
flow_action_for_each(i, entry, actions) {
switch (entry->id) {
case FLOW_ACTION_POLICE:
/* Convert bytes per second to bits per second */
if (entry->police.rate_bytes_ps * 8 > max_link_rate) {
NL_SET_ERR_MSG_MOD(extack,
"Specified policing max rate is larger than underlying link speed");
return -ERANGE;
}
break;
default:
NL_SET_ERR_MSG_MOD(extack,
"Only policing action supported with Egress MATCHALL offload");
return -EOPNOTSUPP;
}
}
return 0;
}
static int cxgb4_matchall_alloc_tc(struct net_device *dev,
struct tc_cls_matchall_offload *cls)
{
struct ch_sched_params p = {
.type = SCHED_CLASS_TYPE_PACKET,
.u.params.level = SCHED_CLASS_LEVEL_CH_RL,
.u.params.mode = SCHED_CLASS_MODE_CLASS,
.u.params.rateunit = SCHED_CLASS_RATEUNIT_BITS,
.u.params.ratemode = SCHED_CLASS_RATEMODE_ABS,
.u.params.class = SCHED_CLS_NONE,
.u.params.minrate = 0,
.u.params.weight = 0,
.u.params.pktsize = dev->mtu,
};
struct netlink_ext_ack *extack = cls->common.extack;
struct cxgb4_tc_port_matchall *tc_port_matchall;
struct port_info *pi = netdev2pinfo(dev);
struct adapter *adap = netdev2adap(dev);
struct flow_action_entry *entry;
struct sched_class *e;
u32 i;
tc_port_matchall = &adap->tc_matchall->port_matchall[pi->port_id];
flow_action_for_each(i, entry, &cls->rule->action)
if (entry->id == FLOW_ACTION_POLICE)
break;
/* Convert from bytes per second to Kbps */
p.u.params.maxrate = div_u64(entry->police.rate_bytes_ps * 8, 1000);
p.u.params.channel = pi->tx_chan;
e = cxgb4_sched_class_alloc(dev, &p);
if (!e) {
NL_SET_ERR_MSG_MOD(extack,
"No free traffic class available for policing action");
return -ENOMEM;
}
tc_port_matchall->egress.hwtc = e->idx;
tc_port_matchall->egress.cookie = cls->cookie;
tc_port_matchall->egress.state = CXGB4_MATCHALL_STATE_ENABLED;
return 0;
}
static void cxgb4_matchall_free_tc(struct net_device *dev)
{
struct cxgb4_tc_port_matchall *tc_port_matchall;
struct port_info *pi = netdev2pinfo(dev);
struct adapter *adap = netdev2adap(dev);
tc_port_matchall = &adap->tc_matchall->port_matchall[pi->port_id];
cxgb4_sched_class_free(dev, tc_port_matchall->egress.hwtc);
tc_port_matchall->egress.hwtc = SCHED_CLS_NONE;
tc_port_matchall->egress.cookie = 0;
tc_port_matchall->egress.state = CXGB4_MATCHALL_STATE_DISABLED;
}
int cxgb4_tc_matchall_replace(struct net_device *dev,
struct tc_cls_matchall_offload *cls_matchall)
{
struct netlink_ext_ack *extack = cls_matchall->common.extack;
struct cxgb4_tc_port_matchall *tc_port_matchall;
struct port_info *pi = netdev2pinfo(dev);
struct adapter *adap = netdev2adap(dev);
int ret;
tc_port_matchall = &adap->tc_matchall->port_matchall[pi->port_id];
if (tc_port_matchall->egress.state == CXGB4_MATCHALL_STATE_ENABLED) {
NL_SET_ERR_MSG_MOD(extack,
"Only 1 Egress MATCHALL can be offloaded");
return -ENOMEM;
}
ret = cxgb4_matchall_egress_validate(dev, cls_matchall);
if (ret)
return ret;
return cxgb4_matchall_alloc_tc(dev, cls_matchall);
}
int cxgb4_tc_matchall_destroy(struct net_device *dev,
struct tc_cls_matchall_offload *cls_matchall)
{
struct cxgb4_tc_port_matchall *tc_port_matchall;
struct port_info *pi = netdev2pinfo(dev);
struct adapter *adap = netdev2adap(dev);
tc_port_matchall = &adap->tc_matchall->port_matchall[pi->port_id];
if (cls_matchall->cookie != tc_port_matchall->egress.cookie)
return -ENOENT;
cxgb4_matchall_free_tc(dev);
return 0;
}
static void cxgb4_matchall_disable_offload(struct net_device *dev)
{
struct cxgb4_tc_port_matchall *tc_port_matchall;
struct port_info *pi = netdev2pinfo(dev);
struct adapter *adap = netdev2adap(dev);
tc_port_matchall = &adap->tc_matchall->port_matchall[pi->port_id];
if (tc_port_matchall->egress.state == CXGB4_MATCHALL_STATE_ENABLED)
cxgb4_matchall_free_tc(dev);
}
int cxgb4_init_tc_matchall(struct adapter *adap)
{
struct cxgb4_tc_port_matchall *tc_port_matchall;
struct cxgb4_tc_matchall *tc_matchall;
int ret;
tc_matchall = kzalloc(sizeof(*tc_matchall), GFP_KERNEL);
if (!tc_matchall)
return -ENOMEM;
tc_port_matchall = kcalloc(adap->params.nports,
sizeof(*tc_port_matchall),
GFP_KERNEL);
if (!tc_port_matchall) {
ret = -ENOMEM;
goto out_free_matchall;
}
tc_matchall->port_matchall = tc_port_matchall;
adap->tc_matchall = tc_matchall;
return 0;
out_free_matchall:
kfree(tc_matchall);
return ret;
}
void cxgb4_cleanup_tc_matchall(struct adapter *adap)
{
u8 i;
if (adap->tc_matchall) {
if (adap->tc_matchall->port_matchall) {
for (i = 0; i < adap->params.nports; i++) {
struct net_device *dev = adap->port[i];
if (dev)
cxgb4_matchall_disable_offload(dev);
}
kfree(adap->tc_matchall->port_matchall);
}
kfree(adap->tc_matchall);
}
}
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