From 965a990984432cd01a9eb3514c64d86f56704295 Mon Sep 17 00:00:00 2001 From: Magnus Karlsson Date: Wed, 2 May 2018 13:01:26 +0200 Subject: xsk: add support for bind for Rx Here, the bind syscall is added. Binding an AF_XDP socket, means associating the socket to an umem, a netdev and a queue index. This can be done in two ways. The first way, creating a "socket from scratch". Create the umem using the XDP_UMEM_REG setsockopt and an associated fill queue with XDP_UMEM_FILL_QUEUE. Create the Rx queue using the XDP_RX_QUEUE setsockopt. Call bind passing ifindex and queue index ("channel" in ethtool speak). The second way to bind a socket, is simply skipping the umem/netdev/queue index, and passing another already setup AF_XDP socket. The new socket will then have the same umem/netdev/queue index as the parent so it will share the same umem. You must also set the flags field in the socket address to XDP_SHARED_UMEM. v2: Use PTR_ERR instead of passing error variable explicitly. Signed-off-by: Magnus Karlsson Signed-off-by: Alexei Starovoitov --- include/uapi/linux/if_xdp.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'include/uapi') diff --git a/include/uapi/linux/if_xdp.h b/include/uapi/linux/if_xdp.h index 65324558829d..e5091881f776 100644 --- a/include/uapi/linux/if_xdp.h +++ b/include/uapi/linux/if_xdp.h @@ -21,6 +21,17 @@ #include +/* Options for the sxdp_flags field */ +#define XDP_SHARED_UMEM 1 + +struct sockaddr_xdp { + __u16 sxdp_family; + __u32 sxdp_ifindex; + __u32 sxdp_queue_id; + __u32 sxdp_shared_umem_fd; + __u16 sxdp_flags; +}; + /* XDP socket options */ #define XDP_RX_RING 1 #define XDP_UMEM_REG 3 -- cgit v1.2.3