Xen devel - May 2010 - [Pv-ops][PATCH 2/3 v3] Netback: Multiple tasklets support.

Netback: Multiple tasklets support.

Now netback uses one pair of tasklets for Tx/Rx data transaction.
Netback tasklet could only run at one CPU at a time, and it is
used to serve all the netfronts. Therefore it has become a
performance bottle neck. This patch is to use multiple tasklet
pairs to replace the current single pair in dom0.

Assuming that Dom0 has CPUNR VCPUs, we define CPUNR kinds of
tasklets pair (CPUNR for Tx, and CPUNR for Rx). Each pare of
tasklets serve specific group of netfronts. Also for those global
and static variables, we duplicated them for each group in
order to avoid the spinlock.

Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>

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