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xdp: introduce flags field in xdp_buff/xdp_frame

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Introduce flags field in xdp_frame and xdp_buffer data structures
to define additional buffer features. At the moment the only
supported buffer feature is frags bit (XDP_FLAGS_HAS_FRAGS).
frags bit is used to specify if this is a linear buffer
(XDP_FLAGS_HAS_FRAGS not set) or a frags frame (XDP_FLAGS_HAS_FRAGS
set). In the latter case the driver is expected to initialize the
skb_shared_info structure at the end of the first buffer to link together
subsequent buffers belonging to the same frame.

Acked-by: Toke Hoiland-Jorgensen <toke@redhat.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/e389f14f3a162c0a5bc6a2e1aa8dd01a90be117d.1642758637.git.lorenzo@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Lorenzo Bianconi 2022-01-21 11:09:45 +01:00 committed by Alexei Starovoitov
parent d16697cb62
commit 2e88d4ff03
1 changed files with 29 additions and 0 deletions
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29
include/net/xdp.h
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@ -66,6 +66,10 @@ struct xdp_txq_info {
struct net_device *dev;
};
enum xdp_buff_flags {
XDP_FLAGS_HAS_FRAGS = BIT(0), /* non-linear xdp buff */
};
struct xdp_buff {
void *data;
void *data_end;
@ -74,13 +78,30 @@ struct xdp_buff {
struct xdp_rxq_info *rxq;
struct xdp_txq_info *txq;
u32 frame_sz; /* frame size to deduce data_hard_end/reserved tailroom*/
u32 flags; /* supported values defined in xdp_buff_flags */
};
static __always_inline bool xdp_buff_has_frags(struct xdp_buff *xdp)
{
return !!(xdp->flags & XDP_FLAGS_HAS_FRAGS);
}
static __always_inline void xdp_buff_set_frags_flag(struct xdp_buff *xdp)
{
xdp->flags |= XDP_FLAGS_HAS_FRAGS;
}
static __always_inline void xdp_buff_clear_frags_flag(struct xdp_buff *xdp)
{
xdp->flags &= ~XDP_FLAGS_HAS_FRAGS;
}
static __always_inline void
xdp_init_buff(struct xdp_buff *xdp, u32 frame_sz, struct xdp_rxq_info *rxq)
{
xdp->frame_sz = frame_sz;
xdp->rxq = rxq;
xdp->flags = 0;
}
static __always_inline void
@ -122,8 +143,14 @@ struct xdp_frame {
*/
struct xdp_mem_info mem;
struct net_device *dev_rx; /* used by cpumap */
u32 flags; /* supported values defined in xdp_buff_flags */
};
static __always_inline bool xdp_frame_has_frags(struct xdp_frame *frame)
{
return !!(frame->flags & XDP_FLAGS_HAS_FRAGS);
}
#define XDP_BULK_QUEUE_SIZE 16
struct xdp_frame_bulk {
int count;
@ -180,6 +207,7 @@ void xdp_convert_frame_to_buff(struct xdp_frame *frame, struct xdp_buff *xdp)
xdp->data_end = frame->data + frame->len;
xdp->data_meta = frame->data - frame->metasize;
xdp->frame_sz = frame->frame_sz;
xdp->flags = frame->flags;
}
static inline
@ -206,6 +234,7 @@ int xdp_update_frame_from_buff(struct xdp_buff *xdp,
xdp_frame->headroom = headroom - sizeof(*xdp_frame);
xdp_frame->metasize = metasize;
xdp_frame->frame_sz = xdp->frame_sz;
xdp_frame->flags = xdp->flags;
return 0;
}