Add hotswapping to FromHost and ToHost elements #424
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Thanks for the PR. But please describe what it does in the commit messages (and in the pull request if it's multiple commits). |
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FromHost initiates a tap device which is used to pass packets to the kernel network stack handling. ToHost uses the tap's fd opened be FromHost. As it was, when sending a new config to click having when the previous had a FromHost element, would fail as the tap device is busy. Hotswapping support enables to send click a hotconfig which forces the new FromHost(and ToHost) to take state from the swapped elements, thus continuing proper packet handling. When adding hotswap support to FromHost, ToHost must also support hotswap as it searches on initialization an existing and initialized FromHost element to take it fd. Signed-off-by: Shlomo Shenzis <shlomo.shenzis@mail.huji.ac.il>
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Done. Removed all changes to blanks and added a description in the commit message. |
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@tbarbette: Anything missing? |
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I do not handle non-DPDK related merges to mainline. If you feel like it you can open a PR to FastClick, I would merge it. |
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Signed-off-by: Shlomo Shenzis shlomo.shenzis@mail.huji.ac.il