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net: add low latency socket poll

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Adds an ndo_ll_poll method and the code that supports it.
This method can be used by low latency applications to busy-poll
Ethernet device queues directly from the socket code.
sysctl_net_ll_poll controls how many microseconds to poll.
Default is zero (disabled).
Individual protocol support will be added by subsequent patches.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Eliezer Tamir <eliezer.tamir@linux.intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Tested-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eliezer Tamir
2013-06-10 11:39:50 +03:00
committed by David S. Miller
parent af12fa6e46
commit 0602129286
12 changed files with 208 additions and 2 deletions
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8
include/linux/skbuff.h
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@@ -386,6 +386,7 @@ typedef unsigned char *sk_buff_data_t;
* @no_fcs: Request NIC to treat last 4 bytes as Ethernet FCS
* @dma_cookie: a cookie to one of several possible DMA operations
* done by skb DMA functions
* @napi_id: id of the NAPI struct this skb came from
* @secmark: security marking
* @mark: Generic packet mark
* @dropcount: total number of sk_receive_queue overflows
@@ -500,8 +501,11 @@ struct sk_buff {
/* 7/9 bit hole (depending on ndisc_nodetype presence) */
kmemcheck_bitfield_end(flags2);
#ifdef CONFIG_NET_DMA
dma_cookie_t dma_cookie;
#if defined CONFIG_NET_DMA || defined CONFIG_NET_LL_RX_POLL
union {
unsigned int napi_id;
dma_cookie_t dma_cookie;
};
#endif
#ifdef CONFIG_NETWORK_SECMARK
__u32 secmark;