From: Alexander Duyck Date: Wed, 10 Dec 2014 03:40:49 +0000 (-0800) Subject: net: Pull out core bits of __netdev_alloc_skb and add __napi_alloc_skb X-Git-Tag: omap-for-v3.19/fixes-rc1~125^2~19^2~4 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fd11a83dd3630ec6a60f8a702446532c5c7e1991;p=pandora-kernel.git net: Pull out core bits of __netdev_alloc_skb and add __napi_alloc_skb This change pulls the core functionality out of __netdev_alloc_skb and places them in a new function named __alloc_rx_skb. The reason for doing this is to make these bits accessible to a new function __napi_alloc_skb. In addition __alloc_rx_skb now has a new flags value that is used to determine which page frag pool to allocate from. If the SKB_ALLOC_NAPI flag is set then the NAPI pool is used. The advantage of this is that we do not have to use local_irq_save/restore when accessing the NAPI pool from NAPI context. In my test setup I saw at least 11ns of savings using the napi_alloc_skb function versus the netdev_alloc_skb function, most of this being due to the fact that we didn't have to call local_irq_save/restore. The main use case for napi_alloc_skb would be for things such as copybreak or page fragment based receive paths where an skb is allocated after the data has been received instead of before. Signed-off-by: Alexander Duyck Signed-off-by: David S. Miller --- Reading git-diff-tree failed