netdev - Re: [PATCH net-next] net: dst: remove gc leftovers

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Date:   Wed, 20 Mar 2019 16:03:58 -0700
From:   Wei Wang <weiwan@...gle.com>
To:     Julian Wiedmann <jwi@...ux.ibm.com>
Cc:     David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net: dst: remove gc leftovers

On Wed, Mar 20, 2019 at 12:03 PM Julian Wiedmann <jwi@...ux.ibm.com> wrote:
>
> Get rid of some obsolete gc-related documentation and macros that were
> missed in commit 5b7c9a8ff828 ("net: remove dst gc related code").
>
> CC: Wei Wang <weiwan@...gle.com>
> Signed-off-by: Julian Wiedmann <jwi@...ux.ibm.com>
> ---

Acked-by: Wei Wang <weiwan@...gle.com>

>
> one more time, with cc netdev...
>
>  include/net/dst.h | 11 -----------
>  net/core/dst.c    | 17 -----------------
>  net/ipv4/route.c  |  2 +-
>  3 files changed, 1 insertion(+), 29 deletions(-)
>
> diff --git a/include/net/dst.h b/include/net/dst.h
> index 6cf0870414c7..12b31c602cb0 100644
> --- a/include/net/dst.h
> +++ b/include/net/dst.h
> @@ -19,17 +19,6 @@
>  #include <net/neighbour.h>
>  #include <asm/processor.h>
>
> -#define DST_GC_MIN     (HZ/10)
> -#define DST_GC_INC     (HZ/2)
> -#define DST_GC_MAX     (120*HZ)
> -
> -/* Each dst_entry has reference count and sits in some parent list(s).
> - * When it is removed from parent list, it is "freed" (dst_free).
> - * After this it enters dead state (dst->obsolete > 0) and if its refcnt
> - * is zero, it can be destroyed immediately, otherwise it is added
> - * to gc list and garbage collector periodically checks the refcnt.
> - */
> -
>  struct sk_buff;
>
>  struct dst_entry {
> diff --git a/net/core/dst.c b/net/core/dst.c
> index a263309df115..1f13d90cd0e4 100644
> --- a/net/core/dst.c
> +++ b/net/core/dst.c
> @@ -26,23 +26,6 @@
>  #include <net/dst.h>
>  #include <net/dst_metadata.h>
>
> -/*
> - * Theory of operations:
> - * 1) We use a list, protected by a spinlock, to add
> - *    new entries from both BH and non-BH context.
> - * 2) In order to keep spinlock held for a small delay,
> - *    we use a second list where are stored long lived
> - *    entries, that are handled by the garbage collect thread
> - *    fired by a workqueue.
> - * 3) This list is guarded by a mutex,
> - *    so that the gc_task and dst_dev_event() can be synchronized.
> - */
> -
> -/*
> - * We want to keep lock & list close together
> - * to dirty as few cache lines as possible in __dst_free().
> - * As this is not a very strong hint, we dont force an alignment on SMP.
> - */
>  int dst_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
>  {
>         kfree_skb(skb);
> diff --git a/net/ipv4/route.c b/net/ipv4/route.c
> index a5da63e5faa2..14c7fdacaa72 100644
> --- a/net/ipv4/route.c
> +++ b/net/ipv4/route.c
> @@ -1176,7 +1176,7 @@ static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
>          *
>          * When a PMTU/redirect information update invalidates a route,
>          * this is indicated by setting obsolete to DST_OBSOLETE_KILL or
> -        * DST_OBSOLETE_DEAD by dst_free().
> +        * DST_OBSOLETE_DEAD.
>          */
>         if (dst->obsolete != DST_OBSOLETE_FORCE_CHK || rt_is_expired(rt))
>                 return NULL;
> --
> 2.16.4
>