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more rigorous erasure constants, comments (#3766)

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* more rigorous erasure constants, comments

* new header size means new golden
This commit is contained in:
Rob Walker
2019-04-14 21:10:09 -07:00
committed by GitHub
parent de52747950
commit 6859907df9
3 changed files with 14 additions and 9 deletions
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6
core/src/packet.rs
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@@ -25,7 +25,7 @@ pub type SharedBlobs = Vec<SharedBlob>;
pub const NUM_PACKETS: usize = 1024 * 8;
pub const BLOB_SIZE: usize = (64 * 1024 - 128); // wikipedia says there should be 20b for ipv4 headers
pub const BLOB_DATA_SIZE: usize = BLOB_SIZE - (BLOB_HEADER_SIZE * 2);
pub const BLOB_DATA_ALIGN: usize = 64;
pub const BLOB_DATA_ALIGN: usize = 16; // safe for erasure input pointers, gf.c needs 16byte-aligned buffers
pub const NUM_BLOBS: usize = (NUM_PACKETS * PACKET_DATA_SIZE) / BLOB_SIZE;
#[derive(Clone, Default, Debug, PartialEq, Serialize, Deserialize)]
@@ -143,7 +143,7 @@ impl Packets {
}
}
#[repr(align(64))] // 64 === BLOB_DATA_ALIGN
#[repr(align(16))] // 16 === BLOB_DATA_ALIGN
pub struct BlobData {
pub data: [u8; BLOB_SIZE],
}
@@ -372,7 +372,7 @@ macro_rules! align {
};
}
pub const BLOB_HEADER_SIZE: usize = align!(SIZE_RANGE.end, BLOB_DATA_ALIGN);
pub const BLOB_HEADER_SIZE: usize = align!(SIZE_RANGE.end, BLOB_DATA_ALIGN); // make sure data() is safe for erasure
pub const BLOB_FLAG_IS_LAST_IN_SLOT: u32 = 0x2;