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What does ZCCD stand for?

ZCCD stands for Zero Copy Callback Descriptor

This definition appears rarely

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a) Initialise a zero-copy descriptor with your callback procedure. b) Pass this descriptor in all zero-copy sends for an arbitrary set of pages. Skbuffs that reference your pages also take a reference on your zero-copy callback descriptor. They release this reference when they release their page references. c) Release your own reference when you've posted all your pages and you're ready for the callback.
6. 12. 6/include/linux/skbuff. h 2006-03-16 17:04:51. 000000000 +0800 @@ -128,6 +128,30 @@ __u16 size; }; +/* Support for callback when skb data has been released */ +typedef struct zccd /* Zero Copy Callback Descriptor.