Messages in this thread | | | Subject | Re: [PATCH v8 net-next 2/7] net: add low latency socket poll | From | Eric Dumazet <> | Date | Mon, 03 Jun 2013 06:05:04 -0700 |
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On Mon, 2013-06-03 at 11:01 +0300, Eliezer Tamir wrote: > 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> > Tested-by: Willem de Bruijn <willemb@google.com> > Signed-off-by: Eliezer Tamir <eliezer.tamir@linux.intel.com> > --- ... > diff --git a/include/net/ll_poll.h b/include/net/ll_poll.h
> + > +static inline bool sk_valid_ll(struct sock *sk) > +{ > + return 0;
return false;
> +} > + > +static inline bool sk_poll_ll(struct sock *sk, int nonblock) > +{ > + return 0;
return false; > +} > + > +static inline void skb_mark_ll(struct sk_buff *skb, struct napi_struct *napi) > +{ > +}
> /* > * Before updating sk_refcnt, we must commit prior changes to memory > * (Documentation/RCU/rculist_nulls.txt for details) > diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c > index 741db5fc..ae98c95 100644 > --- a/net/core/sysctl_net_core.c > +++ b/net/core/sysctl_net_core.c > @@ -19,6 +19,7 @@ > #include <net/ip.h> > #include <net/sock.h> > #include <net/net_ratelimit.h> > +#include <net/ll_poll.h> > > static int one = 1; > > @@ -284,6 +285,15 @@ static struct ctl_table net_core_table[] = { > .proc_handler = flow_limit_table_len_sysctl > }, > #endif /* CONFIG_NET_FLOW_LIMIT */ > +#ifdef CONFIG_NET_LL_RX_POLL > + { > + .procname = "low_latency_poll", > + .data = &sysctl_net_ll_poll, > + .maxlen = sizeof(unsigned long), > + .mode = 0644, > + .proc_handler = proc_dointvec
proc_doulongvec_minmax
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