Support Zero-Copy for Netmap#225
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This commit adds zero-copy through buffer swapping with extra buffer allocated on startup. Netmap Buffers are now organized in pool much like click pool through a completed implementation of Luigi Rizzo's NetmapBufQ. A shared linked list allows multiple thread-local NetmapBufQ to exchange batches of buffers. The amount of extra buffers allocated on startup is set using NetmapInfo, which is now a real element. NetmapBufQ and other old NetmapInfo methods (renamed more accurately NetmapDevice) are moved to lib/netmapdevice.cc Also there was confusion between HAVE_NET_NETMAP_H and HAVE_NETMAP, and the ELEMENT_REQUIRES(netmap). It's not really needed to have part of the netmap subsystem built without HAVE_NETMAP, so HAVE_NET_NETMAP_H is changed by HAVE_NETMAP. This is a first, minimal change just to introduce Zero Copy, it provides improvement but the send and receive method are nearly untouched and not re-worked in this commit.
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This commit adds zero-copy through buffer swapping with extra buffer allocated on startup.
Netmap Buffers are now organized in pool much like click pool through a completed implementation of Luigi Rizzo's NetmapBufQ. A shared linked list allows multiple thread-local NetmapBufQ to exchange batches of buffers.
The amount of extra buffers allocated on startup is set using NetmapInfo, which is now a real element (but it allocates 2048 buffers per thread at minimum). NetmapBufQ and other old NetmapInfo methods (renamed more accurately NetmapDevice) are moved to lib/netmapdevice.cc
Also there was confusion between HAVE_NET_NETMAP_H and HAVE_NETMAP, and the ELEMENT_REQUIRES(netmap). It's not really needed to have part of the netmap subsystem built without HAVE_NETMAP, so HAVE_NET_NETMAP_H is changed by HAVE_NETMAP.
This is a first, minimal change just to introduce Zero Copy, it provides improvement but the send and receive method are nearly untouched and not re-worked in this commit.