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===== Receive Header-Split ===== Header-split is not a user-facing feature. But, we can verify its implementation by testing a feature that is dependent on HS. Linux TCP_RECEIVE_ZEROCOPY, as described in the MTU section, depends on header-split to store payload page-aligned in page-sized buffers. TCP_ZEROCOPY_RECEIVE further requires the administrator to choose MTU such that MSS is 4KB plus room for expected TCP options, and by posting 4KB pages as buffers to the device receive queue. Linux v6.3 '''tools/testing/selftests/net/tcp_mmap''' tests this feature. Limitations are that the test does not differentiate between header-split and fixed-prefix split, and does not cover all possible TCP options. The '''hsplit_packets''' device counter must also match the expected packet rate of the test. <span id="toeplitz-receive-hash"></span>
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