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xdp: add xdp_set_features_flag utility routine

Browse source 
Introduce xdp_set_features_flag utility routine in order to update
dynamically xdp_features according to the dynamic hw configuration via
ethtool (e.g. changing number of hw rx/tx queues).
Add xdp_clear_features_flag() in order to clear all xdp_feature flag.

Reviewed-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Lorenzo Bianconi 2023-03-09 13:25:27 +01:00 • committed by Jakub Kicinski
parent bf51d27704
commit f85949f982
5 changed files with 35 additions and 7 deletions
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1
Documentation/netlink/specs/netdev.yaml
View file

@ -9,6 +9,7 @@ definitions:
-
type: flags
name: xdp-act
render-max: true
entries:
-
name: basic

11
include/net/xdp.h
View file

@ -428,12 +428,18 @@ MAX_XDP_METADATA_KFUNC,
#ifdef CONFIG_NET
u32 bpf_xdp_metadata_kfunc_id(int id);
bool bpf_dev_bound_kfunc_id(u32 btf_id);
void xdp_set_features_flag(struct net_device *dev, xdp_features_t val);
void xdp_features_set_redirect_target(struct net_device *dev, bool support_sg);
void xdp_features_clear_redirect_target(struct net_device *dev);
#else
static inline u32 bpf_xdp_metadata_kfunc_id(int id) { return 0; }
static inline bool bpf_dev_bound_kfunc_id(u32 btf_id) { return false; }
static inline void
xdp_set_features_flag(struct net_device *dev, xdp_features_t val)
{
}
static inline void
xdp_features_set_redirect_target(struct net_device *dev, bool support_sg)
{
@ -445,4 +451,9 @@ xdp_features_clear_redirect_target(struct net_device *dev)
}
#endif
static inline void xdp_clear_features_flag(struct net_device *dev)
{
xdp_set_features_flag(dev, 0);
}
#endif /* __LINUX_NET_XDP_H__ */

2
include/uapi/linux/netdev.h
View file

@ -33,6 +33,8 @@ enum netdev_xdp_act {
NETDEV_XDP_ACT_HW_OFFLOAD = 16,
NETDEV_XDP_ACT_RX_SG = 32,
NETDEV_XDP_ACT_NDO_XMIT_SG = 64,
NETDEV_XDP_ACT_MASK = 127,
};
enum {

26
net/core/xdp.c
View file

@ -774,20 +774,32 @@ static int __init xdp_metadata_init(void)
}
late_initcall(xdp_metadata_init);
void xdp_set_features_flag(struct net_device *dev, xdp_features_t val)
{
val &= NETDEV_XDP_ACT_MASK;
if (dev->xdp_features == val)
return;
dev->xdp_features = val;
call_netdevice_notifiers(NETDEV_XDP_FEAT_CHANGE, dev);
}
EXPORT_SYMBOL_GPL(xdp_set_features_flag);
void xdp_features_set_redirect_target(struct net_device *dev, bool support_sg)
{
dev->xdp_features |= NETDEV_XDP_ACT_NDO_XMIT;
if (support_sg)
dev->xdp_features |= NETDEV_XDP_ACT_NDO_XMIT_SG;
xdp_features_t val = (dev->xdp_features | NETDEV_XDP_ACT_NDO_XMIT);
call_netdevice_notifiers(NETDEV_XDP_FEAT_CHANGE, dev);
if (support_sg)
val |= NETDEV_XDP_ACT_NDO_XMIT_SG;
xdp_set_features_flag(dev, val);
}
EXPORT_SYMBOL_GPL(xdp_features_set_redirect_target);
void xdp_features_clear_redirect_target(struct net_device *dev)
{
dev->xdp_features &= ~(NETDEV_XDP_ACT_NDO_XMIT |
NETDEV_XDP_ACT_NDO_XMIT_SG);
call_netdevice_notifiers(NETDEV_XDP_FEAT_CHANGE, dev);
xdp_features_t val = dev->xdp_features;
val &= ~(NETDEV_XDP_ACT_NDO_XMIT | NETDEV_XDP_ACT_NDO_XMIT_SG);
xdp_set_features_flag(dev, val);
}
EXPORT_SYMBOL_GPL(xdp_features_clear_redirect_target);

2
tools/include/uapi/linux/netdev.h
View file

@ -33,6 +33,8 @@ enum netdev_xdp_act {
NETDEV_XDP_ACT_HW_OFFLOAD = 16,
NETDEV_XDP_ACT_RX_SG = 32,
NETDEV_XDP_ACT_NDO_XMIT_SG = 64,
NETDEV_XDP_ACT_MASK = 127,
};
enum {