Auto merge of #3453 - arctic-alpaca:main, r=JohnTitor

Add `if_xdp.h` structs and constants and add `SOL_XDP` to musl

Hi,

this PR adds constants and structs from `if_xdp.h` for use with [`AF_XDP`](https://www.kernel.org/doc/html/latest/networking/af_xdp.html). It also adds `SOL_XDP` to musl which was missing before.

I'm not sure whether the location I added the code is correct, I just edited the files where the `AF_XDP` constant was defined.

Some of the structs were changed between their initial release in the kernel and the current version. For those, `_v1` structs have been added for backwards compatibility.

libc-test/build.rs

@@ -3418,6 +3418,7 @@ fn test_linux(target: &str) {
         "linux/if_alg.h",
         "linux/if_ether.h",
         "linux/if_tun.h",
+        "linux/if_xdp.h",
         "linux/input.h",
         "linux/ipv6.h",
         "linux/kexec.h",
@@ -3652,6 +3653,30 @@ fn test_linux(target: &str) {
                 true
             }
 
+            // FIXME: Requires >= 5.3 kernel headers.
+            // Everything that uses install-musl.sh has 4.19 kernel headers.
+            "xdp_options" if musl => true,
+
+            // FIXME: Requires >= 5.4 kernel headers.
+            // Everything that uses install-musl.sh has 4.19 kernel headers.
+            "xdp_umem_reg" | "xdp_ring_offset" | "xdp_mmap_offsets" if musl => true,
+
+            // FIXME: Requires >= 5.9 kernel headers.
+            // Everything that uses install-musl.sh has 4.19 kernel headers.
+            "xdp_statistics" if musl => true,
+
+            // A new field was added in kernel 5.4, this is the old version for backwards compatibility.
+            // https://github.com/torvalds/linux/commit/77cd0d7b3f257fd0e3096b4fdcff1a7d38e99e10
+            "xdp_ring_offset_v1" | "xdp_mmap_offsets_v1" => true,
+
+            // Multiple new fields were added in kernel 5.9, this is the old version for backwards compatibility.
+            // https://github.com/torvalds/linux/commit/77cd0d7b3f257fd0e3096b4fdcff1a7d38e99e10
+            "xdp_statistics_v1" => true,
+
+            // A new field was added in kernel 5.4, this is the old version for backwards compatibility.
+            // https://github.com/torvalds/linux/commit/c05cd3645814724bdeb32a2b4d953b12bdea5f8c
+            "xdp_umem_reg_v1" => true,
+
             _ => false,
         }
     });
@@ -4004,6 +4029,34 @@ fn test_linux(target: &str) {
                 true
             }
 
+            // FIXME: Requires >= 5.3 kernel headers.
+            // Everything that uses install-musl.sh has 4.19 kernel headers.
+            "XDP_OPTIONS_ZEROCOPY" | "XDP_OPTIONS"
+                if musl =>
+            {
+                true
+            }
+
+            // FIXME: Requires >= 5.4 kernel headers.
+            // Everything that uses install-musl.sh has 4.19 kernel headers.
+            "XSK_UNALIGNED_BUF_OFFSET_SHIFT"
+            | "XSK_UNALIGNED_BUF_ADDR_MASK"
+            | "XDP_UMEM_UNALIGNED_CHUNK_FLAG"
+            | "XDP_RING_NEED_WAKEUP"
+            | "XDP_USE_NEED_WAKEUP"
+                if musl =>
+            {
+                true
+            }
+
+            // FIXME: Requires >= 6.6 kernel headers.
+            "XDP_USE_SG"
+            | "XDP_PKT_CONTD"
+                =>
+            {
+                true
+            }
+
             _ => false,
         }
     });

libc-test/semver/linux-musl.txt

@@ -23,6 +23,30 @@ PF_XDP
 PIDFD_NONBLOCK
 PR_SET_VMA
 PR_SET_VMA_ANON_NAME
+SOL_XDP
+XDP_SHARED_UMEM
+XDP_COPY
+XDP_ZEROCOPY
+XDP_USE_NEED_WAKEUP
+XDP_USE_SG
+XDP_UMEM_UNALIGNED_CHUNK_FLAG
+XDP_RING_NEED_WAKEUP
+XDP_MMAP_OFFSETS
+XDP_RX_RING
+XDP_TX_RING
+XDP_UMEM_REG
+XDP_UMEM_FILL_RING
+XDP_UMEM_COMPLETION_RING
+XDP_STATISTICS
+XDP_OPTIONS
+XDP_OPTIONS_ZEROCOPY
+XDP_PGOFF_RX_RING
+XDP_PGOFF_TX_RING
+XDP_UMEM_PGOFF_FILL_RING
+XDP_UMEM_PGOFF_COMPLETION_RING
+XSK_UNALIGNED_BUF_OFFSET_SHIFT
+XSK_UNALIGNED_BUF_ADDR_MASK
+XDP_PKT_CONTD
 adjtimex
 aio_cancel
 aio_error

libc-test/semver/linux.txt

@@ -3218,6 +3218,29 @@ W_EXITCODE
 W_STOPCODE
 XATTR_CREATE
 XATTR_REPLACE
+XDP_SHARED_UMEM
+XDP_COPY
+XDP_ZEROCOPY
+XDP_USE_NEED_WAKEUP
+XDP_USE_SG
+XDP_UMEM_UNALIGNED_CHUNK_FLAG
+XDP_RING_NEED_WAKEUP
+XDP_MMAP_OFFSETS
+XDP_RX_RING
+XDP_TX_RING
+XDP_UMEM_REG
+XDP_UMEM_FILL_RING
+XDP_UMEM_COMPLETION_RING
+XDP_STATISTICS
+XDP_OPTIONS
+XDP_OPTIONS_ZEROCOPY
+XDP_PGOFF_RX_RING
+XDP_PGOFF_TX_RING
+XDP_UMEM_PGOFF_FILL_RING
+XDP_UMEM_PGOFF_COMPLETION_RING
+XSK_UNALIGNED_BUF_OFFSET_SHIFT
+XSK_UNALIGNED_BUF_ADDR_MASK
+XDP_PKT_CONTD
 XTABS
 YESEXPR
 YESSTR

src/unix/linux_like/linux/gnu/mod.rs

@@ -355,6 +355,83 @@ s! {
         #[cfg(libc_union)]
         pub u: __c_anonymous_ptrace_syscall_info_data,
     }
+
+    // linux/if_xdp.h
+
+    pub struct sockaddr_xdp {
+        pub sxdp_family: ::__u16,
+        pub sxdp_flags: ::__u16,
+        pub sxdp_ifindex: ::__u32,
+        pub sxdp_queue_id: ::__u32,
+        pub sxdp_shared_umem_fd: ::__u32,
+    }
+
+    pub struct xdp_ring_offset {
+        pub producer: ::__u64,
+        pub consumer: ::__u64,
+        pub desc: ::__u64,
+        pub flags: ::__u64,
+    }
+
+    pub struct xdp_mmap_offsets {
+        pub rx: xdp_ring_offset,
+        pub tx: xdp_ring_offset,
+        pub fr: xdp_ring_offset,
+        pub cr: xdp_ring_offset,
+    }
+
+    pub struct xdp_ring_offset_v1 {
+        pub producer: ::__u64,
+        pub consumer: ::__u64,
+        pub desc: ::__u64,
+    }
+
+    pub struct xdp_mmap_offsets_v1 {
+        pub rx: xdp_ring_offset_v1,
+        pub tx: xdp_ring_offset_v1,
+        pub fr: xdp_ring_offset_v1,
+        pub cr: xdp_ring_offset_v1,
+    }
+
+    pub struct xdp_umem_reg {
+        pub addr: ::__u64,
+        pub len: ::__u64,
+        pub chunk_size: ::__u32,
+        pub headroom: ::__u32,
+        pub flags: ::__u32,
+    }
+
+    pub struct xdp_umem_reg_v1 {
+        pub addr: ::__u64,
+        pub len: ::__u64,
+        pub chunk_size: ::__u32,
+        pub headroom: ::__u32,
+    }
+
+    pub struct xdp_statistics {
+        pub rx_dropped: ::__u64,
+        pub rx_invalid_descs: ::__u64,
+        pub tx_invalid_descs: ::__u64,
+        pub rx_ring_full: ::__u64,
+        pub rx_fill_ring_empty_descs: ::__u64,
+        pub tx_ring_empty_descs: ::__u64,
+    }
+
+    pub struct xdp_statistics_v1 {
+        pub rx_dropped: ::__u64,
+        pub rx_invalid_descs: ::__u64,
+        pub tx_invalid_descs: ::__u64,
+    }
+
+    pub struct xdp_options {
+        pub flags: ::__u32,
+    }
+
+    pub struct xdp_desc {
+        pub addr: ::__u64,
+        pub len: ::__u32,
+        pub options: ::__u32,
+    }
 }
 
 impl siginfo_t {
@@ -920,6 +997,38 @@ pub const GENL_UNS_ADMIN_PERM: ::c_int = 0x10;
 pub const GENL_ID_VFS_DQUOT: ::c_int = ::NLMSG_MIN_TYPE + 1;
 pub const GENL_ID_PMCRAID: ::c_int = ::NLMSG_MIN_TYPE + 2;
 
+// linux/if_xdp.h
+pub const XDP_SHARED_UMEM: ::__u16 = 1 << 0;
+pub const XDP_COPY: ::__u16 = 1 << 1;
+pub const XDP_ZEROCOPY: ::__u16 = 1 << 2;
+pub const XDP_USE_NEED_WAKEUP: ::__u16 = 1 << 3;
+pub const XDP_USE_SG: ::__u16 = 1 << 4;
+
+pub const XDP_UMEM_UNALIGNED_CHUNK_FLAG: ::__u32 = 1 << 0;
+
+pub const XDP_RING_NEED_WAKEUP: ::__u32 = 1 << 0;
+
+pub const XDP_MMAP_OFFSETS: ::c_int = 1;
+pub const XDP_RX_RING: ::c_int = 2;
+pub const XDP_TX_RING: ::c_int = 3;
+pub const XDP_UMEM_REG: ::c_int = 4;
+pub const XDP_UMEM_FILL_RING: ::c_int = 5;
+pub const XDP_UMEM_COMPLETION_RING: ::c_int = 6;
+pub const XDP_STATISTICS: ::c_int = 7;
+pub const XDP_OPTIONS: ::c_int = 8;
+
+pub const XDP_OPTIONS_ZEROCOPY: ::__u32 = 1 << 0;
+
+pub const XDP_PGOFF_RX_RING: ::off_t = 0;
+pub const XDP_PGOFF_TX_RING: ::off_t = 0x80000000;
+pub const XDP_UMEM_PGOFF_FILL_RING: ::c_ulonglong = 0x100000000;
+pub const XDP_UMEM_PGOFF_COMPLETION_RING: ::c_ulonglong = 0x180000000;
+
+pub const XSK_UNALIGNED_BUF_OFFSET_SHIFT: ::c_int = 48;
+pub const XSK_UNALIGNED_BUF_ADDR_MASK: ::c_ulonglong = (1 << XSK_UNALIGNED_BUF_OFFSET_SHIFT) - 1;
+
+pub const XDP_PKT_CONTD: ::__u32 = 1 << 0;
+
 // elf.h
 pub const NT_PRSTATUS: ::c_int = 1;
 pub const NT_PRFPREG: ::c_int = 2;

src/unix/linux_like/linux/musl/mod.rs

@@ -271,6 +271,83 @@ s! {
         pub maxerror: ::c_long,
         pub esterror: ::c_long,
     }
+
+    // linux/if_xdp.h
+
+    pub struct sockaddr_xdp {
+        pub sxdp_family: ::__u16,
+        pub sxdp_flags: ::__u16,
+        pub sxdp_ifindex: ::__u32,
+        pub sxdp_queue_id: ::__u32,
+        pub sxdp_shared_umem_fd: ::__u32,
+    }
+
+    pub struct xdp_ring_offset {
+        pub producer: ::__u64,
+        pub consumer: ::__u64,
+        pub desc: ::__u64,
+        pub flags: ::__u64,
+    }
+
+    pub struct xdp_mmap_offsets {
+        pub rx: xdp_ring_offset,
+        pub tx: xdp_ring_offset,
+        pub fr: xdp_ring_offset,
+        pub cr: xdp_ring_offset,
+    }
+
+    pub struct xdp_ring_offset_v1 {
+        pub producer: ::__u64,
+        pub consumer: ::__u64,
+        pub desc: ::__u64,
+    }
+
+    pub struct xdp_mmap_offsets_v1 {
+        pub rx: xdp_ring_offset_v1,
+        pub tx: xdp_ring_offset_v1,
+        pub fr: xdp_ring_offset_v1,
+        pub cr: xdp_ring_offset_v1,
+    }
+
+    pub struct xdp_umem_reg {
+        pub addr: ::__u64,
+        pub len: ::__u64,
+        pub chunk_size: ::__u32,
+        pub headroom: ::__u32,
+        pub flags: ::__u32,
+    }
+
+    pub struct xdp_umem_reg_v1 {
+        pub addr: ::__u64,
+        pub len: ::__u64,
+        pub chunk_size: ::__u32,
+        pub headroom: ::__u32,
+    }
+
+    pub struct xdp_statistics {
+        pub rx_dropped: ::__u64,
+        pub rx_invalid_descs: ::__u64,
+        pub tx_invalid_descs: ::__u64,
+        pub rx_ring_full: ::__u64,
+        pub rx_fill_ring_empty_descs: ::__u64,
+        pub tx_ring_empty_descs: ::__u64,
+    }
+
+    pub struct xdp_statistics_v1 {
+        pub rx_dropped: ::__u64,
+        pub rx_invalid_descs: ::__u64,
+        pub tx_invalid_descs: ::__u64,
+    }
+
+    pub struct xdp_options {
+        pub flags: ::__u32,
+    }
+
+    pub struct xdp_desc {
+        pub addr: ::__u64,
+        pub len: ::__u32,
+        pub options: ::__u32,
+    }
 }
 
 s_no_extra_traits! {
@@ -703,6 +780,40 @@ pub const TIME_ERROR: ::c_int = 5;
 pub const TIME_BAD: ::c_int = TIME_ERROR;
 pub const MAXTC: ::c_long = 6;
 
+pub const SOL_XDP: ::c_int = 283;
+
+// linux/if_xdp.h
+pub const XDP_SHARED_UMEM: ::__u16 = 1 << 0;
+pub const XDP_COPY: ::__u16 = 1 << 1;
+pub const XDP_ZEROCOPY: ::__u16 = 1 << 2;
+pub const XDP_USE_NEED_WAKEUP: ::__u16 = 1 << 3;
+pub const XDP_USE_SG: ::__u16 = 1 << 4;
+
+pub const XDP_UMEM_UNALIGNED_CHUNK_FLAG: ::__u32 = 1 << 0;
+
+pub const XDP_RING_NEED_WAKEUP: ::__u32 = 1 << 0;
+
+pub const XDP_MMAP_OFFSETS: ::c_int = 1;
+pub const XDP_RX_RING: ::c_int = 2;
+pub const XDP_TX_RING: ::c_int = 3;
+pub const XDP_UMEM_REG: ::c_int = 4;
+pub const XDP_UMEM_FILL_RING: ::c_int = 5;
+pub const XDP_UMEM_COMPLETION_RING: ::c_int = 6;
+pub const XDP_STATISTICS: ::c_int = 7;
+pub const XDP_OPTIONS: ::c_int = 8;
+
+pub const XDP_OPTIONS_ZEROCOPY: ::__u32 = 1 << 0;
+
+pub const XDP_PGOFF_RX_RING: ::off_t = 0;
+pub const XDP_PGOFF_TX_RING: ::off_t = 0x80000000;
+pub const XDP_UMEM_PGOFF_FILL_RING: ::c_ulonglong = 0x100000000;
+pub const XDP_UMEM_PGOFF_COMPLETION_RING: ::c_ulonglong = 0x180000000;
+
+pub const XSK_UNALIGNED_BUF_OFFSET_SHIFT: ::c_int = 48;
+pub const XSK_UNALIGNED_BUF_ADDR_MASK: ::c_ulonglong = (1 << XSK_UNALIGNED_BUF_OFFSET_SHIFT) - 1;
+
+pub const XDP_PKT_CONTD: ::__u32 = 1 << 0;
+
 cfg_if! {
     if #[cfg(target_arch = "s390x")] {
         pub const POSIX_FADV_DONTNEED: ::c_int = 6;