Merge pull request #3956 from arctic-alpaca/af_xdp

Linux: update and add missing AF_XDP API

Author: tgross35

libc-test/build.rs

@@ -3817,12 +3817,25 @@ fn test_linux(target: &str) {
 
             // 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,
+            "xdp_ring_offset" | "xdp_mmap_offsets" if musl => true,
+
+            // FIXME: Requires >= 6.8 kernel headers.
+            // A field was added in 6.8.
+            // https://github.com/torvalds/linux/commit/341ac980eab90ac1f6c22ee9f9da83ed9604d899
+            // The previous version of the struct was removed in 6.11 due to a bug.
+            // https://github.com/torvalds/linux/commit/32654bbd6313b4cfc82297e6634fa9725c3c900f
+            "xdp_umem_reg" => true,
 
             // FIXME: Requires >= 5.9 kernel headers.
             // Everything that uses install-musl.sh has 4.19 kernel headers.
             "xdp_statistics" if musl => true,
 
+            // FIXME: Requires >= 6.8 kernel headers.
+            "xsk_tx_metadata"
+            | "__c_anonymous_xsk_tx_metadata_union"
+            | "xsk_tx_metadata_request"
+            | "xsk_tx_metadata_completion" => 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,
@@ -4267,6 +4280,23 @@ fn test_linux(target: &str) {
                 true
             }
 
+            // FIXME: Requires >= 6.8 kernel headers.
+            "XDP_UMEM_TX_SW_CSUM"
+            | "XDP_TXMD_FLAGS_TIMESTAMP"
+            | "XDP_TXMD_FLAGS_CHECKSUM"
+            | "XDP_TX_METADATA"
+                =>
+            {
+                true
+            }
+
+            // FIXME: Requires >= 6.11 kernel headers.
+            "XDP_UMEM_TX_METADATA_LEN"
+                =>
+            {
+                true
+            }
+
             // FIXME: Requires >= 6.6 kernel headers.
             "SYS_fchmodat2" => true,
 
@@ -4524,7 +4554,9 @@ fn test_linux(target: &str) {
         (musl && struct_ == "mcontext_t" && field == "__extcontext" && loongarch64) ||
         // FIXME(#4121): a new field was added from `f_spare`
         (struct_ == "statvfs" && field == "__f_spare") ||
-        (struct_ == "statvfs64" && field == "__f_spare")
+        (struct_ == "statvfs64" && field == "__f_spare") ||
+        // the `xsk_tx_metadata_union` field is an anonymous union
+        (struct_ == "xsk_tx_metadata" && field == "xsk_tx_metadata_union")
     });
 
     cfg.skip_roundtrip(move |s| match s {

libc-test/semver/linux.txt

@@ -3387,6 +3387,11 @@ W_EXITCODE
 W_STOPCODE
 XATTR_CREATE
 XATTR_REPLACE
+XDP_TXMD_FLAGS_CHECKSUM
+XDP_TXMD_FLAGS_TIMESTAMP
+XDP_TX_METADATA
+XDP_UMEM_TX_METADATA_LEN
+XDP_UMEM_TX_SW_CSUM
 XTABS
 YESEXPR
 YESSTR

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

@@ -401,6 +401,7 @@ s! {
         pub chunk_size: ::__u32,
         pub headroom: ::__u32,
         pub flags: ::__u32,
+        pub tx_metadata_len: ::__u32,
     }
 
     pub struct xdp_umem_reg_v1 {

src/unix/linux_like/linux/mod.rs

@@ -1194,6 +1194,16 @@ s! {
         pub chan: ::c_uint,
         pub rsv: [::c_uint; 5],
     }
+
+    // linux/if_xdp.h
+    pub struct xsk_tx_metadata_completion {
+        pub tx_timestamp: ::__u64,
+    }
+
+    pub struct xsk_tx_metadata_request {
+        pub csum_start: ::__u16,
+        pub csum_offset: ::__u16,
+    }
 }
 
 cfg_if! {
@@ -1648,6 +1658,19 @@ s_no_extra_traits! {
         pub flags: ::c_uint,
         pub anonymous_2: __c_anonymous_ptp_perout_request_2,
     }
+
+    // linux/if_xdp.h
+    #[allow(missing_debug_implementations)]
+    pub struct xsk_tx_metadata {
+        pub flags: ::__u64,
+        pub xsk_tx_metadata_union: __c_anonymous_xsk_tx_metadata_union,
+    }
+
+    #[allow(missing_debug_implementations)]
+    pub union __c_anonymous_xsk_tx_metadata_union {
+        pub request: xsk_tx_metadata_request,
+        pub completion: xsk_tx_metadata_completion,
+    }
 }
 
 cfg_if! {
@@ -5592,6 +5615,15 @@ pub const SCHED_FLAG_KEEP_PARAMS: ::c_int = 0x10;
 pub const SCHED_FLAG_UTIL_CLAMP_MIN: ::c_int = 0x20;
 pub const SCHED_FLAG_UTIL_CLAMP_MAX: ::c_int = 0x40;
 
+// linux/if_xdp.h
+pub const XDP_UMEM_TX_SW_CSUM: ::__u32 = 1 << 1;
+pub const XDP_UMEM_TX_METADATA_LEN: ::__u32 = 1 << 2;
+
+pub const XDP_TXMD_FLAGS_TIMESTAMP: ::__u32 = 1 << 0;
+pub const XDP_TXMD_FLAGS_CHECKSUM: ::__u32 = 1 << 1;
+
+pub const XDP_TX_METADATA: ::__u32 = 1 << 1;
+
 // elf.h
 pub const NT_PRSTATUS: ::c_int = 1;
 pub const NT_PRFPREG: ::c_int = 2;

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

@@ -311,6 +311,7 @@ s! {
         pub chunk_size: ::__u32,
         pub headroom: ::__u32,
         pub flags: ::__u32,
+        pub tx_metadata_len: ::__u32,
     }
 
     pub struct xdp_umem_reg_v1 {