diff options
| author | Magnus Karlsson <magnus.karlsson@intel.com> | 2018-05-02 13:01:24 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2018-05-03 15:55:23 -0700 |
| commit | 423f38329d267969130fb6f2c685f73d72687558 (patch) | |
| tree | ab7c0df0819c420846ac47c18ddc0fd614eaf035 /include | |
| parent | c0c77d8fb787cfe0c3fca689c2a30d1dad4eaba7 (diff) | |
xsk: add umem fill queue support and mmap
Here, we add another setsockopt for registered user memory (umem)
called XDP_UMEM_FILL_QUEUE. Using this socket option, the process can
ask the kernel to allocate a queue (ring buffer) and also mmap it
(XDP_UMEM_PGOFF_FILL_QUEUE) into the process.
The queue is used to explicitly pass ownership of umem frames from the
user process to the kernel. These frames will in a later patch be
filled in with Rx packet data by the kernel.
v2: Fixed potential crash in xsk_mmap.
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/if_xdp.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/uapi/linux/if_xdp.h b/include/uapi/linux/if_xdp.h index 41252135a0fe..975661e1baca 100644 --- a/include/uapi/linux/if_xdp.h +++ b/include/uapi/linux/if_xdp.h @@ -23,6 +23,7 @@ /* XDP socket options */ #define XDP_UMEM_REG 3 +#define XDP_UMEM_FILL_RING 4 struct xdp_umem_reg { __u64 addr; /* Start of packet data area */ @@ -31,4 +32,18 @@ struct xdp_umem_reg { __u32 frame_headroom; /* Frame head room */ }; +/* Pgoff for mmaping the rings */ +#define XDP_UMEM_PGOFF_FILL_RING 0x100000000 + +struct xdp_ring { + __u32 producer __attribute__((aligned(64))); + __u32 consumer __attribute__((aligned(64))); +}; + +/* Used for the fill and completion queues for buffers */ +struct xdp_umem_ring { + struct xdp_ring ptrs; + __u32 desc[0] __attribute__((aligned(64))); +}; + #endif /* _LINUX_IF_XDP_H */ |