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Split umem race condition #2

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derlaft opened this issue Nov 20, 2024 · 0 comments
Open

Split umem race condition #2

derlaft opened this issue Nov 20, 2024 · 0 comments

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@derlaft
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derlaft commented Nov 20, 2024

asavie/xdp@b4f19b9 Introduces a split umem, one half for rx, one half for tx.

This also changes how free descriptors are marked: instead of having one free list, there's now two.

However, this creates a problem: received descriptors can be sent back directly with Transmit. In this case, they are only marked as txFree and GetDescs can return them before their transmission is complete. .

Unless I'm missing something this creates a race condition and might damage sent packets.
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@derlaft