Re: [Qemu-devel] [PATCH v1 2/5] slirp: make timeout local

[Paolo Bonzini <pbonzini@redhat.com>]

Il 08/08/2013 08:26, Liu Ping Fan ha scritto:
> Each slirp has its own time to caculate timeout.
> 
> Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
> ---
>  slirp/slirp.c | 22 ++++++++++------------
>  slirp/slirp.h |  3 +++
>  2 files changed, 13 insertions(+), 12 deletions(-)
> 
> diff --git a/slirp/slirp.c b/slirp/slirp.c
> index 80b28ea..55654d5 100644
> --- a/slirp/slirp.c
> +++ b/slirp/slirp.c
> @@ -40,8 +40,6 @@ static const uint8_t special_ethaddr[ETH_ALEN] = {
>  static const uint8_t zero_ethaddr[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
>  
>  u_int curtime;
> -static u_int time_fasttimo, last_slowtimo;
> -static int do_slowtimo;
>  
>  static QTAILQ_HEAD(slirp_instances, Slirp) slirp_instances =
>      QTAILQ_HEAD_INITIALIZER(slirp_instances);
> @@ -278,14 +276,13 @@ void slirp_pollfds_fill(GArray *pollfds)
>      /*
>       * First, TCP sockets
>       */
> -    do_slowtimo = 0;
>  
>      QTAILQ_FOREACH(slirp, &slirp_instances, entry) {
>          /*
>           * *_slowtimo needs calling if there are IP fragments
>           * in the fragment queue, or there are TCP connections active
>           */
> -        do_slowtimo |= ((slirp->tcb.so_next != &slirp->tcb) ||
> +        slirp->do_slowtimo = ((slirp->tcb.so_next != &slirp->tcb) ||
>                  (&slirp->ipq.ip_link != slirp->ipq.ip_link.next));
>  
>          for (so = slirp->tcb.so_next; so != &slirp->tcb;
> @@ -299,8 +296,9 @@ void slirp_pollfds_fill(GArray *pollfds)
>              /*
>               * See if we need a tcp_fasttimo
>               */
> -            if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK) {
> -                time_fasttimo = curtime; /* Flag when we want a fasttimo */
> +            if (slirp->time_fasttimo == 0 &&
> +                so->so_tcpcb->t_flags & TF_DELACK) {
> +                slirp->time_fasttimo = curtime; /* Flag when want a fasttimo */
>              }
>  
>              /*
> @@ -381,7 +379,7 @@ void slirp_pollfds_fill(GArray *pollfds)
>                      udp_detach(so);
>                      continue;
>                  } else {
> -                    do_slowtimo = 1; /* Let socket expire */
> +                    slirp->do_slowtimo = 1; /* Let socket expire */
>                  }
>              }
>  
> @@ -422,7 +420,7 @@ void slirp_pollfds_fill(GArray *pollfds)
>                      icmp_detach(so);
>                      continue;
>                  } else {
> -                    do_slowtimo = 1; /* Let socket expire */
> +                    slirp->do_slowtimo = 1; /* Let socket expire */
>                  }
>              }
>  
> @@ -454,14 +452,14 @@ void slirp_pollfds_poll(GArray *pollfds, int select_error)
>          /*
>           * See if anything has timed out
>           */
> -        if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) {
> +        if (slirp->time_fasttimo && ((curtime - slirp->time_fasttimo) >= 2)) {
>              tcp_fasttimo(slirp);
> -            time_fasttimo = 0;
> +            slirp->time_fasttimo = 0;
>          }
> -        if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) {
> +        if (slirp->do_slowtimo && ((curtime - slirp->last_slowtimo) >= 499)) {
>              ip_slowtimo(slirp);
>              tcp_slowtimo(slirp);
> -            last_slowtimo = curtime;
> +            slirp->last_slowtimo = curtime;
>          }
>  
>          /*
> diff --git a/slirp/slirp.h b/slirp/slirp.h
> index fe0e65d..008360e 100644
> --- a/slirp/slirp.h
> +++ b/slirp/slirp.h
> @@ -203,6 +203,9 @@ bool arp_table_search(Slirp *slirp, uint32_t ip_addr,
>  
>  struct Slirp {
>      QTAILQ_ENTRY(Slirp) entry;
> +    u_int time_fasttimo;
> +    u_int last_slowtimo;
> +    int do_slowtimo;
>  
>      /* virtual network configuration */
>      struct in_addr vnetwork_addr;
> 

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

In addition, you could modify slirp_update_timeout to run after
slirp_pollfds_fill, and actually look at the timeout fields to set the
right timeout (2 if time_fasttimo is nonzero, 499 if do_slowtimo is true).

Paolo