Re: [RFC bpf-next 2/8] net: introduce XDP features flag

[Lorenzo Bianconi <lorenzo@kernel.org>]

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[...]
> 
> All of the above makes sense, thanks for the details. In this case,
> agreed that it's probably not possible to probe these easily without
> explicit flags :-(
> 
> Let me bikeshed the names a bit as well, feel free to ignore...
> 
> 1. Maybe group XDP_{ABORTED,DROP,PASS,TX,REDIRECT} with some common
> prefix? XDP_ACT_xxx (ACT for action)? Or XDP_RET_xxx?
> 

ack, I am fine to add ACT prefix, something like:

- XDP_ACT_ABORTED
- XDP_ACT_DROP
...

- XDP_ACT_REDIRECT

> 2. Maybe: XDP_SOCK_ZEROCOPY -> XSK_ZEROCOPY ?

ack, agree

> 
> 3. XDP_HW_OFFLOAD we don't seem to set anywhere? nfp/netdevsim changes
> are missing or out of scope?

actually we set XDP_F_HW_OFFLOAD for netdevsim and nfp driver

> 
> 4. Agree with Jakub, not sure XDP_TX_LOCK doesn't seem relevant?

ack, I agree we can drop it

> 
> 5. XDP_REDIRECT_TARGET -> XDP_RCV_REDIRECT (can 'receive' and handle
> redirects? in this case XDP_ACT_REDIRECT means can 'generate'

naming is always hard :) what about XDP_NDO_XMIT instead of
XDP_REDIRECT_TARGET? (and rely on XDP_ACT_REDIRECT for XDP_F_REDIRECT)

> redirects)
> 
> 6. For frags, maybe:
> 
> XDP_FRAG_RX     -> XDP_SG_RX

fine

> XDP_FRAG_TARGET -> XDP_SG_RCV_REDIRECT (so this is that same as
> XDP_RCV_REDIRECT but can handle frags)

what about of XDP_NDO_XMIT_SG?

Regards,
Lorenzo

> 
> But also probably fine to keep FRAG instead of SG to match BPF_F_XDP_HAS_FRAGS?
> 
> > Regards,
> > Lorenzo
> >
> > >
> > > > Regards,
> > > > Lorenzo
> > > >
> > > > >
> > > > > > On Mon, Dec 19, 2022 at 9:03 PM <sdf@google.com> wrote:
> > > > > >>
> > > > > >> On 12/19, Lorenzo Bianconi wrote:
> > > > > >> > From: Marek Majtyka <alardam@gmail.com>
> > > > > >>
> > > > > >> > Implement support for checking what kind of XDP features a netdev
> > > > > >> > supports. Previously, there was no way to do this other than to try to
> > > > > >> > create an AF_XDP socket on the interface or load an XDP program and see
> > > > > >> > if it worked. This commit changes this by adding a new variable which
> > > > > >> > describes all xdp supported functions on pretty detailed level:
> > > > > >>
> > > > > >> >   - aborted
> > > > > >> >   - drop
> > > > > >> >   - pass
> > > > > >> >   - tx
> > > > > >> >   - redirect
> > > > > >> >   - sock_zerocopy
> > > > > >> >   - hw_offload
> > > > > >> >   - redirect_target
> > > > > >> >   - tx_lock
> > > > > >> >   - frag_rx
> > > > > >> >   - frag_target
> > > > > >>
> > > > > >> > Zerocopy mode requires that redirect XDP operation is implemented in a
> > > > > >> > driver and the driver supports also zero copy mode. Full mode requires
> > > > > >> > that all XDP operation are implemented in the driver. Basic mode is just
> > > > > >> > full mode without redirect operation. Frag target requires
> > > > > >> > redirect_target one is supported by the driver.
> > > > > >>
> > > > > >> Can you share more about _why_ is it needed? If we can already obtain
> > > > > >> most of these signals via probing, why export the flags?
> > > > > >>
> > > > > >> > Initially, these new flags are disabled for all drivers by default.
> > > > > >>
> > > > > >> > Co-developed-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
> > > > > >> > Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
> > > > > >> > Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
> > > > > >> > Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> > > > > >> > Signed-off-by: Marek Majtyka <alardam@gmail.com>
> > > > > >> > ---
> > > > > >> >   .../networking/netdev-xdp-features.rst        | 60 +++++++++++++++++
> > > > > >> >   include/linux/netdevice.h                     |  2 +
> > > > > >> >   include/linux/xdp_features.h                  | 64 +++++++++++++++++++
> > > > > >> >   include/uapi/linux/if_link.h                  |  7 ++
> > > > > >> >   include/uapi/linux/xdp_features.h             | 34 ++++++++++
> > > > > >> >   net/core/rtnetlink.c                          | 34 ++++++++++
> > > > > >> >   tools/include/uapi/linux/if_link.h            |  7 ++
> > > > > >> >   tools/include/uapi/linux/xdp_features.h       | 34 ++++++++++
> > > > > >> >   8 files changed, 242 insertions(+)
> > > > > >> >   create mode 100644 Documentation/networking/netdev-xdp-features.rst
> > > > > >> >   create mode 100644 include/linux/xdp_features.h
> > > > > >> >   create mode 100644 include/uapi/linux/xdp_features.h
> > > > > >> >   create mode 100644 tools/include/uapi/linux/xdp_features.h
> > > > > >>
> > > > > >> > diff --git a/Documentation/networking/netdev-xdp-features.rst
> > > > > >> > b/Documentation/networking/netdev-xdp-features.rst
> > > > > >> > new file mode 100644
> > > > > >> > index 000000000000..1dc803fe72dd
> > > > > >> > --- /dev/null
> > > > > >> > +++ b/Documentation/networking/netdev-xdp-features.rst
> > > > > >> > @@ -0,0 +1,60 @@
> > > > > >> > +.. SPDX-License-Identifier: GPL-2.0
> > > > > >> > +
> > > > > >> > +=====================
> > > > > >> > +Netdev XDP features
> > > > > >> > +=====================
> > > > > >> > +
> > > > > >> > + * XDP FEATURES FLAGS
> > > > > >> > +
> > > > > >> > +Following netdev xdp features flags can be retrieved over route netlink
> > > > > >> > +interface (compact form) - the same way as netdev feature flags.
> > > > > >> > +These features flags are read only and cannot be change at runtime.
> > > > > >> > +
> > > > > >> > +*  XDP_ABORTED
> > > > > >> > +
> > > > > >> > +This feature informs if netdev supports xdp aborted action.
> > > > > >> > +
> > > > > >> > +*  XDP_DROP
> > > > > >> > +
> > > > > >> > +This feature informs if netdev supports xdp drop action.
> > > > > >> > +
> > > > > >> > +*  XDP_PASS
> > > > > >> > +
> > > > > >> > +This feature informs if netdev supports xdp pass action.
> > > > > >> > +
> > > > > >> > +*  XDP_TX
> > > > > >> > +
> > > > > >> > +This feature informs if netdev supports xdp tx action.
> > > > > >> > +
> > > > > >> > +*  XDP_REDIRECT
> > > > > >> > +
> > > > > >> > +This feature informs if netdev supports xdp redirect action.
> > > > > >> > +It assumes the all beforehand mentioned flags are enabled.
> > > > > >> > +
> > > > > >> > +*  XDP_SOCK_ZEROCOPY
> > > > > >> > +
> > > > > >> > +This feature informs if netdev driver supports xdp zero copy.
> > > > > >> > +It assumes the all beforehand mentioned flags are enabled.
> > > > > >> > +
> > > > > >> > +*  XDP_HW_OFFLOAD
> > > > > >> > +
> > > > > >> > +This feature informs if netdev driver supports xdp hw oflloading.
> > > > > >> > +
> > > > > >> > +*  XDP_TX_LOCK
> > > > > >> > +
> > > > > >> > +This feature informs if netdev ndo_xdp_xmit function requires locking.
> > > > > >> > +
> > > > > >> > +*  XDP_REDIRECT_TARGET
> > > > > >> > +
> > > > > >> > +This feature informs if netdev implements ndo_xdp_xmit callback.
> > > > > >> > +
> > > > > >> > +*  XDP_FRAG_RX
> > > > > >> > +
> > > > > >> > +This feature informs if netdev implements non-linear xdp buff support in
> > > > > >> > +the driver napi callback.
> > > > > >> > +
> > > > > >> > +*  XDP_FRAG_TARGET
> > > > > >> > +
> > > > > >> > +This feature informs if netdev implements non-linear xdp buff support in
> > > > > >> > +ndo_xdp_xmit callback. XDP_FRAG_TARGET requires XDP_REDIRECT_TARGET is
> > > > > >> > properly
> > > > > >> > +supported.
> > > > > >> > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > > > > >> > index aad12a179e54..ae5a8564383b 100644
> > > > > >> > --- a/include/linux/netdevice.h
> > > > > >> > +++ b/include/linux/netdevice.h
> > > > > >> > @@ -43,6 +43,7 @@
> > > > > >> >   #include <net/xdp.h>
> > > > > >>
> > > > > >> >   #include <linux/netdev_features.h>
> > > > > >> > +#include <linux/xdp_features.h>
> > > > > >> >   #include <linux/neighbour.h>
> > > > > >> >   #include <uapi/linux/netdevice.h>
> > > > > >> >   #include <uapi/linux/if_bonding.h>
> > > > > >> > @@ -2362,6 +2363,7 @@ struct net_device {
> > > > > >> >       struct rtnl_hw_stats64  *offload_xstats_l3;
> > > > > >>
> > > > > >> >       struct devlink_port     *devlink_port;
> > > > > >> > +     xdp_features_t          xdp_features;
> > > > > >> >   };
> > > > > >> >   #define to_net_dev(d) container_of(d, struct net_device, dev)
> > > > > >>
> > > > > >> > diff --git a/include/linux/xdp_features.h b/include/linux/xdp_features.h
> > > > > >> > new file mode 100644
> > > > > >> > index 000000000000..4e72a86ef329
> > > > > >> > --- /dev/null
> > > > > >> > +++ b/include/linux/xdp_features.h
> > > > > >> > @@ -0,0 +1,64 @@
> > > > > >> > +/* SPDX-License-Identifier: GPL-2.0-or-later */
> > > > > >> > +/*
> > > > > >> > + * Network device xdp features.
> > > > > >> > + */
> > > > > >> > +#ifndef _LINUX_XDP_FEATURES_H
> > > > > >> > +#define _LINUX_XDP_FEATURES_H
> > > > > >> > +
> > > > > >> > +#include <linux/types.h>
> > > > > >> > +#include <linux/bitops.h>
> > > > > >> > +#include <asm/byteorder.h>
> > > > > >> > +#include <uapi/linux/xdp_features.h>
> > > > > >> > +
> > > > > >> > +typedef u32 xdp_features_t;
> > > > > >> > +
> > > > > >> > +#define __XDP_F_BIT(bit)     ((xdp_features_t)1 << (bit))
> > > > > >> > +#define __XDP_F(name)                __XDP_F_BIT(XDP_F_##name##_BIT)
> > > > > >> > +
> > > > > >> > +#define XDP_F_ABORTED                __XDP_F(ABORTED)
> > > > > >> > +#define XDP_F_DROP           __XDP_F(DROP)
> > > > > >> > +#define XDP_F_PASS           __XDP_F(PASS)
> > > > > >> > +#define XDP_F_TX             __XDP_F(TX)
> > > > > >> > +#define XDP_F_REDIRECT               __XDP_F(REDIRECT)
> > > > > >> > +#define XDP_F_REDIRECT_TARGET        __XDP_F(REDIRECT_TARGET)
> > > > > >> > +#define XDP_F_SOCK_ZEROCOPY  __XDP_F(SOCK_ZEROCOPY)
> > > > > >> > +#define XDP_F_HW_OFFLOAD     __XDP_F(HW_OFFLOAD)
> > > > > >> > +#define XDP_F_TX_LOCK                __XDP_F(TX_LOCK)
> > > > > >> > +#define XDP_F_FRAG_RX                __XDP_F(FRAG_RX)
> > > > > >> > +#define XDP_F_FRAG_TARGET    __XDP_F(FRAG_TARGET)
> > > > > >> > +
> > > > > >> > +#define XDP_F_BASIC          (XDP_F_ABORTED | XDP_F_DROP |   \
> > > > > >> > +                              XDP_F_PASS | XDP_F_TX)
> > > > > >> > +
> > > > > >> > +#define XDP_F_FULL           (XDP_F_BASIC | XDP_F_REDIRECT)
> > > > > >> > +
> > > > > >> > +#define XDP_F_FULL_ZC                (XDP_F_FULL | XDP_F_SOCK_ZEROCOPY)
> > > > > >> > +
> > > > > >> > +#define XDP_FEATURES_ABORTED_STR             "xdp-aborted"
> > > > > >> > +#define XDP_FEATURES_DROP_STR                        "xdp-drop"
> > > > > >> > +#define XDP_FEATURES_PASS_STR                        "xdp-pass"
> > > > > >> > +#define XDP_FEATURES_TX_STR                  "xdp-tx"
> > > > > >> > +#define XDP_FEATURES_REDIRECT_STR            "xdp-redirect"
> > > > > >> > +#define XDP_FEATURES_REDIRECT_TARGET_STR     "xdp-redirect-target"
> > > > > >> > +#define XDP_FEATURES_SOCK_ZEROCOPY_STR               "xdp-sock-zerocopy"
> > > > > >> > +#define XDP_FEATURES_HW_OFFLOAD_STR          "xdp-hw-offload"
> > > > > >> > +#define XDP_FEATURES_TX_LOCK_STR             "xdp-tx-lock"
> > > > > >> > +#define XDP_FEATURES_FRAG_RX_STR             "xdp-frag-rx"
> > > > > >> > +#define XDP_FEATURES_FRAG_TARGET_STR         "xdp-frag-target"
> > > > > >> > +
> > > > > >> > +#define DECLARE_XDP_FEATURES_TABLE(name, length)                             \
> > > > > >> > +     const char name[][length] = {                                           \
> > > > > >> > +             [XDP_F_ABORTED_BIT] = XDP_FEATURES_ABORTED_STR,                 \
> > > > > >> > +             [XDP_F_DROP_BIT] = XDP_FEATURES_DROP_STR,                       \
> > > > > >> > +             [XDP_F_PASS_BIT] = XDP_FEATURES_PASS_STR,                       \
> > > > > >> > +             [XDP_F_TX_BIT] = XDP_FEATURES_TX_STR,                           \
> > > > > >> > +             [XDP_F_REDIRECT_BIT] = XDP_FEATURES_REDIRECT_STR,               \
> > > > > >> > +             [XDP_F_REDIRECT_TARGET_BIT] = XDP_FEATURES_REDIRECT_TARGET_STR, \
> > > > > >> > +             [XDP_F_SOCK_ZEROCOPY_BIT] = XDP_FEATURES_SOCK_ZEROCOPY_STR,     \
> > > > > >> > +             [XDP_F_HW_OFFLOAD_BIT] = XDP_FEATURES_HW_OFFLOAD_STR,           \
> > > > > >> > +             [XDP_F_TX_LOCK_BIT] = XDP_FEATURES_TX_LOCK_STR,                 \
> > > > > >> > +             [XDP_F_FRAG_RX_BIT] = XDP_FEATURES_FRAG_RX_STR,                 \
> > > > > >> > +             [XDP_F_FRAG_TARGET_BIT] = XDP_FEATURES_FRAG_TARGET_STR,         \
> > > > > >> > +     }
> > > > > >> > +
> > > > > >> > +#endif /* _LINUX_XDP_FEATURES_H */
> > > > > >> > diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
> > > > > >> > index 1021a7e47a86..971c658ceaea 100644
> > > > > >> > --- a/include/uapi/linux/if_link.h
> > > > > >> > +++ b/include/uapi/linux/if_link.h
> > > > > >> > @@ -374,6 +374,8 @@ enum {
> > > > > >>
> > > > > >> >       IFLA_DEVLINK_PORT,
> > > > > >>
> > > > > >> > +     IFLA_XDP_FEATURES,
> > > > > >> > +
> > > > > >> >       __IFLA_MAX
> > > > > >> >   };
> > > > > >>
> > > > > >> > @@ -1318,6 +1320,11 @@ enum {
> > > > > >>
> > > > > >> >   #define IFLA_XDP_MAX (__IFLA_XDP_MAX - 1)
> > > > > >>
> > > > > >> > +enum {
> > > > > >> > +     IFLA_XDP_FEATURES_WORD_UNSPEC = 0,
> > > > > >> > +     IFLA_XDP_FEATURES_BITS_WORD,
> > > > > >> > +};
> > > > > >> > +
> > > > > >> >   enum {
> > > > > >> >       IFLA_EVENT_NONE,
> > > > > >> >       IFLA_EVENT_REBOOT,              /* internal reset / reboot */
> > > > > >> > diff --git a/include/uapi/linux/xdp_features.h
> > > > > >> > b/include/uapi/linux/xdp_features.h
> > > > > >> > new file mode 100644
> > > > > >> > index 000000000000..48eb42069bcd
> > > > > >> > --- /dev/null
> > > > > >> > +++ b/include/uapi/linux/xdp_features.h
> > > > > >> > @@ -0,0 +1,34 @@
> > > > > >> > +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> > > > > >> > +/*
> > > > > >> > + * Copyright (c) 2020 Intel
> > > > > >> > + */
> > > > > >> > +
> > > > > >> > +#ifndef __UAPI_LINUX_XDP_FEATURES__
> > > > > >> > +#define __UAPI_LINUX_XDP_FEATURES__
> > > > > >> > +
> > > > > >> > +enum {
> > > > > >> > +     XDP_F_ABORTED_BIT,
> > > > > >> > +     XDP_F_DROP_BIT,
> > > > > >> > +     XDP_F_PASS_BIT,
> > > > > >> > +     XDP_F_TX_BIT,
> > > > > >> > +     XDP_F_REDIRECT_BIT,
> > > > > >> > +     XDP_F_REDIRECT_TARGET_BIT,
> > > > > >> > +     XDP_F_SOCK_ZEROCOPY_BIT,
> > > > > >> > +     XDP_F_HW_OFFLOAD_BIT,
> > > > > >> > +     XDP_F_TX_LOCK_BIT,
> > > > > >> > +     XDP_F_FRAG_RX_BIT,
> > > > > >> > +     XDP_F_FRAG_TARGET_BIT,
> > > > > >> > +     /*
> > > > > >> > +      * Add your fresh new property above and remember to update
> > > > > >> > +      * documentation.
> > > > > >> > +      */
> > > > > >> > +     XDP_FEATURES_COUNT,
> > > > > >> > +};
> > > > > >> > +
> > > > > >> > +#define XDP_FEATURES_WORDS                   ((XDP_FEATURES_COUNT + 32 - 1) / 32)
> > > > > >> > +#define XDP_FEATURES_WORD(blocks, index)     ((blocks)[(index) / 32U])
> > > > > >> > +#define XDP_FEATURES_FIELD_FLAG(index)               (1U << (index) % 32U)
> > > > > >> > +#define XDP_FEATURES_BIT_IS_SET(blocks, index)        \
> > > > > >> > +     (XDP_FEATURES_WORD(blocks, index) & XDP_FEATURES_FIELD_FLAG(index))
> > > > > >> > +
> > > > > >> > +#endif  /* __UAPI_LINUX_XDP_FEATURES__ */
> > > > > >> > diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
> > > > > >> > index 64289bc98887..1c299746b614 100644
> > > > > >> > --- a/net/core/rtnetlink.c
> > > > > >> > +++ b/net/core/rtnetlink.c
> > > > > >> > @@ -1016,6 +1016,14 @@ static size_t rtnl_xdp_size(void)
> > > > > >> >       return xdp_size;
> > > > > >> >   }
> > > > > >>
> > > > > >> > +static size_t rtnl_xdp_features_size(void)
> > > > > >> > +{
> > > > > >> > +     size_t xdp_size = nla_total_size(0) +   /* nest IFLA_XDP_FEATURES */
> > > > > >> > +                       XDP_FEATURES_WORDS * nla_total_size(4);
> > > > > >> > +
> > > > > >> > +     return xdp_size;
> > > > > >> > +}
> > > > > >> > +
> > > > > >> >   static size_t rtnl_prop_list_size(const struct net_device *dev)
> > > > > >> >   {
> > > > > >> >       struct netdev_name_node *name_node;
> > > > > >> > @@ -1103,6 +1111,7 @@ static noinline size_t if_nlmsg_size(const struct
> > > > > >> > net_device *dev,
> > > > > >> >              + rtnl_prop_list_size(dev)
> > > > > >> >              + nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */
> > > > > >> >              + rtnl_devlink_port_size(dev)
> > > > > >> > +            + rtnl_xdp_features_size() /* IFLA_XDP_FEATURES */
> > > > > >> >              + 0;
> > > > > >> >   }
> > > > > >>
> > > > > >> > @@ -1546,6 +1555,27 @@ static int rtnl_xdp_fill(struct sk_buff *skb,
> > > > > >> > struct net_device *dev)
> > > > > >> >       return err;
> > > > > >> >   }
> > > > > >>
> > > > > >> > +static int rtnl_xdp_features_fill(struct sk_buff *skb, struct net_device
> > > > > >> > *dev)
> > > > > >> > +{
> > > > > >> > +     struct nlattr *attr;
> > > > > >> > +
> > > > > >> > +     attr = nla_nest_start_noflag(skb, IFLA_XDP_FEATURES);
> > > > > >> > +     if (!attr)
> > > > > >> > +             return -EMSGSIZE;
> > > > > >> > +
> > > > > >> > +     BUILD_BUG_ON(XDP_FEATURES_WORDS != 1);
> > > > > >> > +     if (nla_put_u32(skb, IFLA_XDP_FEATURES_BITS_WORD, dev->xdp_features))
> > > > > >> > +             goto err_cancel;
> > > > > >> > +
> > > > > >> > +     nla_nest_end(skb, attr);
> > > > > >> > +
> > > > > >> > +     return 0;
> > > > > >> > +
> > > > > >> > +err_cancel:
> > > > > >> > +     nla_nest_cancel(skb, attr);
> > > > > >> > +     return -EMSGSIZE;
> > > > > >> > +}
> > > > > >> > +
> > > > > >> >   static u32 rtnl_get_event(unsigned long event)
> > > > > >> >   {
> > > > > >> >       u32 rtnl_event_type = IFLA_EVENT_NONE;
> > > > > >> > @@ -1904,6 +1934,9 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
> > > > > >> >       if (rtnl_fill_devlink_port(skb, dev))
> > > > > >> >               goto nla_put_failure;
> > > > > >>
> > > > > >> > +     if (rtnl_xdp_features_fill(skb, dev))
> > > > > >> > +             goto nla_put_failure;
> > > > > >> > +
> > > > > >> >       nlmsg_end(skb, nlh);
> > > > > >> >       return 0;
> > > > > >>
> > > > > >> > @@ -1968,6 +2001,7 @@ static const struct nla_policy
> > > > > >> > ifla_policy[IFLA_MAX+1] = {
> > > > > >> >       [IFLA_TSO_MAX_SIZE]     = { .type = NLA_REJECT },
> > > > > >> >       [IFLA_TSO_MAX_SEGS]     = { .type = NLA_REJECT },
> > > > > >> >       [IFLA_ALLMULTI]         = { .type = NLA_REJECT },
> > > > > >> > +     [IFLA_XDP_FEATURES]     = { .type = NLA_NESTED },
> > > > > >> >   };
> > > > > >>
> > > > > >> >   static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
> > > > > >> > diff --git a/tools/include/uapi/linux/if_link.h
> > > > > >> > b/tools/include/uapi/linux/if_link.h
> > > > > >> > index 82fe18f26db5..994228e9909a 100644
> > > > > >> > --- a/tools/include/uapi/linux/if_link.h
> > > > > >> > +++ b/tools/include/uapi/linux/if_link.h
> > > > > >> > @@ -354,6 +354,8 @@ enum {
> > > > > >>
> > > > > >> >       IFLA_DEVLINK_PORT,
> > > > > >>
> > > > > >> > +     IFLA_XDP_FEATURES,
> > > > > >> > +
> > > > > >> >       __IFLA_MAX
> > > > > >> >   };
> > > > > >>
> > > > > >> > @@ -1222,6 +1224,11 @@ enum {
> > > > > >>
> > > > > >> >   #define IFLA_XDP_MAX (__IFLA_XDP_MAX - 1)
> > > > > >>
> > > > > >> > +enum {
> > > > > >> > +     IFLA_XDP_FEATURES_WORD_UNSPEC = 0,
> > > > > >> > +     IFLA_XDP_FEATURES_BITS_WORD,
> > > > > >> > +};
> > > > > >> > +
> > > > > >> >   enum {
> > > > > >> >       IFLA_EVENT_NONE,
> > > > > >> >       IFLA_EVENT_REBOOT,              /* internal reset / reboot */
> > > > > >> > diff --git a/tools/include/uapi/linux/xdp_features.h
> > > > > >> > b/tools/include/uapi/linux/xdp_features.h
> > > > > >> > new file mode 100644
> > > > > >> > index 000000000000..48eb42069bcd
> > > > > >> > --- /dev/null
> > > > > >> > +++ b/tools/include/uapi/linux/xdp_features.h
> > > > > >> > @@ -0,0 +1,34 @@
> > > > > >> > +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> > > > > >> > +/*
> > > > > >> > + * Copyright (c) 2020 Intel
> > > > > >> > + */
> > > > > >> > +
> > > > > >> > +#ifndef __UAPI_LINUX_XDP_FEATURES__
> > > > > >> > +#define __UAPI_LINUX_XDP_FEATURES__
> > > > > >> > +
> > > > > >> > +enum {
> > > > > >> > +     XDP_F_ABORTED_BIT,
> > > > > >> > +     XDP_F_DROP_BIT,
> > > > > >> > +     XDP_F_PASS_BIT,
> > > > > >> > +     XDP_F_TX_BIT,
> > > > > >> > +     XDP_F_REDIRECT_BIT,
> > > > > >> > +     XDP_F_REDIRECT_TARGET_BIT,
> > > > > >> > +     XDP_F_SOCK_ZEROCOPY_BIT,
> > > > > >> > +     XDP_F_HW_OFFLOAD_BIT,
> > > > > >> > +     XDP_F_TX_LOCK_BIT,
> > > > > >> > +     XDP_F_FRAG_RX_BIT,
> > > > > >> > +     XDP_F_FRAG_TARGET_BIT,
> > > > > >> > +     /*
> > > > > >> > +      * Add your fresh new property above and remember to update
> > > > > >> > +      * documentation.
> > > > > >> > +      */
> > > > > >> > +     XDP_FEATURES_COUNT,
> > > > > >> > +};
> > > > > >> > +
> > > > > >> > +#define XDP_FEATURES_WORDS                   ((XDP_FEATURES_COUNT + 32 - 1) / 32)
> > > > > >> > +#define XDP_FEATURES_WORD(blocks, index)     ((blocks)[(index) / 32U])
> > > > > >> > +#define XDP_FEATURES_FIELD_FLAG(index)               (1U << (index) % 32U)
> > > > > >> > +#define XDP_FEATURES_BIT_IS_SET(blocks, index)        \
> > > > > >> > +     (XDP_FEATURES_WORD(blocks, index) & XDP_FEATURES_FIELD_FLAG(index))
> > > > > >> > +
> > > > > >> > +#endif  /* __UAPI_LINUX_XDP_FEATURES__ */
> > > > > >> > --
> > > > > >> > 2.38.1
> > > > > >>
> > > > >

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