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xsk: add umem fill queue support and mmap

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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>
This commit is contained in:
Magnus Karlsson
2018-05-02 13:01:24 +02:00
committed by Alexei Starovoitov
parent c0c77d8fb7
commit 423f38329d
7 changed files with 183 additions and 2 deletions
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15
include/uapi/linux/if_xdp.h
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@@ -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 */