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/*
* rh_wrap.c - RHEL specific wrappers
*/
#include <linux/netdevice.h>
#include <net/pkt_cls.h>
/* Structures used by out-of-tree drivers compiled against
* RHEL7.4 code base.
*/
struct tc_cls_u32_offload_rh74 {
/* knode values */
enum tc_clsu32_command command;
union {
struct tc_cls_u32_knode knode;
struct tc_cls_u32_hnode hnode;
};
};
struct tc_cls_flower_offload_rh74 {
enum tc_fl_command command;
u32 prio;
unsigned long cookie;
struct flow_dissector *dissector;
struct fl_flow_key *mask;
struct fl_flow_key *key;
struct tcf_exts *exts;
};
struct tc_cls_matchall_offload_rh74 {
enum tc_matchall_command command;
struct tcf_exts *exts;
unsigned long cookie;
};
struct tc_to_netdev_rh74 {
unsigned int type;
union {
u8 tc;
struct tc_cls_u32_offload_rh74 *cls_u32;
struct tc_cls_flower_offload_rh74 *cls_flower;
struct tc_cls_matchall_offload_rh74 *cls_mall;
};
bool egress_dev;
};
static inline
int handle_sch_mqprio_rh74(struct net_device *dev,
const struct tc_mqprio_qopt_offload *mqprio)
{
struct tc_to_netdev_rh74 tc74 = {
.type = TC_SETUP_QDISC_MQPRIO,
.tc = mqprio->qopt.num_tc,
};
/* For RHEL7.4 only DCB mode is valid */
if (mqprio->mode != TC_MQPRIO_MODE_DCB)
return -ENOTSUPP;
return dev->netdev_ops->ndo_setup_tc_rh74(dev, 0, 0, &tc74);
}
static inline
int handle_cls_u32_rh74(struct net_device *dev, u32 handle,
const struct tc_cls_u32_offload *cls_u32)
{
struct tc_cls_u32_offload_rh74 cls_u32_rh74 = {
.command = cls_u32->command,
.knode = cls_u32->knode,
.hnode = cls_u32->hnode,
};
struct tc_to_netdev_rh74 tc74 = {
.type = TC_SETUP_CLSU32,
.cls_u32 = &cls_u32_rh74,
};
const struct tc_cls_common_offload *common = &cls_u32->common;
/* All older drivers supports only single chain */
if (common->chain_index)
return -ENOTSUPP;
return dev->netdev_ops->ndo_setup_tc_rh74(dev, handle, common->protocol,
&tc74);
}
static inline
int tcf_exts_get_dev(struct net_device *dev, struct tcf_exts *exts,
struct net_device **hw_dev)
{
#ifdef CONFIG_NET_CLS_ACT
const struct tc_action *a;
LIST_HEAD(actions);
if (!tcf_exts_has_actions(exts))
return -EINVAL;
tcf_exts_to_list(exts, &actions);
list_for_each_entry(a, &actions, list) {
if (a->ops->get_dev)
*hw_dev = a->ops->get_dev(a);
}
if (*hw_dev)
return 0;
#endif
return -EOPNOTSUPP;
}
static inline
int handle_cls_flower_rh74(struct net_device *dev, u32 handle,
const struct tc_cls_flower_offload *cls_flower)
{
struct tc_cls_flower_offload_rh74 cls_flower_rh74 = {
.command = cls_flower->command,
.prio = cls_flower->common.prio,
.cookie = cls_flower->cookie,
.dissector = cls_flower->dissector,
.mask = cls_flower->mask,
.key = cls_flower->key,
.exts = cls_flower->exts,
};
struct tc_to_netdev_rh74 tc74 = {
.type = TC_SETUP_CLSFLOWER,
.cls_flower = &cls_flower_rh74,
};
const struct tc_cls_common_offload *common = &cls_flower->common;
/* All older drivers supports only single chain */
if (common->chain_index)
return -ENOTSUPP;
/*
* Emulate 'egress_dev':
* tc_can_offload(dev)?
* yes - leave egress_dev unset
* - call .ndo_setup_tc() for the 'dev'
* no - retrieve egress device from one of assigned action(s)
* - set egress_dev to true
* - call .ndo_setup_tc() for this egress device
*/
if (!tc_can_offload(dev)) {
struct net_device *hw_dev = NULL;
if (tcf_exts_get_dev(dev, cls_flower->exts, &hw_dev) ||
(hw_dev && !tc_can_offload(hw_dev)))
return -EINVAL;
dev = hw_dev;
tc74.egress_dev = true;
}
return dev->netdev_ops->ndo_setup_tc_rh74(dev, handle, common->protocol,
&tc74);
}
static inline
int handle_cls_matchall_rh74(struct net_device *dev, u32 handle,
const struct tc_cls_matchall_offload *cls_mall)
{
struct tc_cls_matchall_offload_rh74 cls_mall_rh74 = {
.command = cls_mall->command,
.exts = cls_mall->exts,
.cookie = cls_mall->cookie,
};
struct tc_to_netdev_rh74 tc74 = {
.type = TC_SETUP_CLSMATCHALL,
.cls_mall = &cls_mall_rh74,
};
const struct tc_cls_common_offload *common = &cls_mall->common;
/* All older drivers supports only single chain */
if (common->chain_index)
return -ENOTSUPP;
return dev->netdev_ops->ndo_setup_tc_rh74(dev, handle, common->protocol,
&tc74);
}
static bool tech_preview_marked = false;
int __rh_call_ndo_setup_tc(struct net_device *dev, u32 handle,
enum tc_setup_type type, void *type_data)
{
const struct net_device_ops *ops = dev->netdev_ops;
int ret = -EOPNOTSUPP;
if (get_ndo_ext(ops, ndo_setup_tc_rh)) {
/*
* The drivers implementing .ndo_setup_tc_rh() should handle
* only types >= TC_SETUP_BLOCK & TC_SETUP_QDISC_MQPRIO.
* The types TC_SETUP_{CLSU32,CLSFLOWER, CLSMATCHALL,CLSBPF}
* are handled by TC setup callbacks.
*/
switch (type) {
case TC_SETUP_CLSU32:
case TC_SETUP_CLSFLOWER:
case TC_SETUP_CLSMATCHALL:
case TC_SETUP_CLSBPF:
return 0;
default:
ret = get_ndo_ext(ops, ndo_setup_tc_rh)(dev, type,
type_data);
}
} else if (ops->ndo_setup_tc_rh74) {
/*
* Callback .ndo_setup_tc() for RHEL-7.4 drivers should be
* called only when TC offloading is supported and enabled
* by the device. There is one exception: flower classifier
* in combination with mirred action where offloading can
* be provided by egress device. This functionality is
* handled in handle_cls_flower_rh74().
*/
if (!tc_can_offload(dev) && type != TC_SETUP_CLSFLOWER)
return 0;
switch (type) {
case TC_SETUP_QDISC_MQPRIO:
ret = handle_sch_mqprio_rh74(dev, type_data);
break;
case TC_SETUP_CLSU32:
ret = handle_cls_u32_rh74(dev, handle, type_data);
break;
case TC_SETUP_CLSFLOWER:
ret = handle_cls_flower_rh74(dev, handle, type_data);
break;
case TC_SETUP_CLSMATCHALL:
ret = handle_cls_matchall_rh74(dev, handle, type_data);
break;
default:
break;
}
} else if (ops->ndo_setup_tc_rh72 && type == TC_SETUP_QDISC_MQPRIO) {
/* Drivers implementing .ndo_setup_tc_rh72()
* Note that drivers that implement .ndo_setup_tc_rh72() can
* only support mqprio so this entry-point can be called
* only for this type.
*/
struct tc_mqprio_qopt_offload *mqprio = type_data;
/* For RHEL7.2 only DCB mode is valid */
if (mqprio->mode != TC_MQPRIO_MODE_DCB)
return -ENOTSUPP;
ret = ops->ndo_setup_tc_rh72(dev, mqprio->qopt.num_tc);
}
/* TC offloading is a Tech-Preview so inform an user in case that
* offloading setup succeeded.
*/
if (!ret && !tech_preview_marked) {
mark_tech_preview("TC offloading", NULL);
tech_preview_marked = true;
}
return ret;
}
EXPORT_SYMBOL(__rh_call_ndo_setup_tc);
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