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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 <[email protected]>
Signed-off-by: Jesse Brandeburg <[email protected]>
Signed-off-by: Eliezer Tamir <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Tested-by: Willem de Bruijn <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eliezer Tamir 2013-06-10 11:39:50 +03:00 • committed by David S. Miller
commit 0602129286
12 changed files with 208 additions and 2 deletions
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6
net/socket.c
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@ -104,6 +104,12 @@
#include <linux/route.h>
#include <linux/sockios.h>
#include <linux/atalk.h>
#include <net/ll_poll.h>
#ifdef CONFIG_NET_LL_RX_POLL
unsigned long sysctl_net_ll_poll __read_mostly;
EXPORT_SYMBOL_GPL(sysctl_net_ll_poll);
#endif
static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov,