On Tue, Mar 04, 2014 at 10:32:19PM +0000, Zoltan Kiss wrote:
> These counters help determine how often the guest sends a packet with more
> than MAX_SKB_FRAGS frags.
>
> NOTE: if bisect brought you here, you should apply the series up until #9,
> otherwise malicious guests can block other guests by not releasing their sent
> packets.
>
> Signed-off-by: Zoltan Kiss <zoltan.k...@citrix.com>
> ---
> drivers/net/xen-netback/common.h | 1 +
> drivers/net/xen-netback/interface.c | 7 +++++++
> drivers/net/xen-netback/netback.c | 1 +
> 3 files changed, 9 insertions(+)
>
> diff --git a/drivers/net/xen-netback/common.h
> b/drivers/net/xen-netback/common.h
> index eac171e..d8a2298 100644
> --- a/drivers/net/xen-netback/common.h
> +++ b/drivers/net/xen-netback/common.h
> @@ -170,6 +170,7 @@ struct xenvif {
> unsigned long tx_zerocopy_sent;
> unsigned long tx_zerocopy_success;
> unsigned long tx_zerocopy_fail;
> + unsigned long tx_frag_overflow;
>
> /* Miscellaneous private stuff. */
> struct net_device *dev;
> diff --git a/drivers/net/xen-netback/interface.c
> b/drivers/net/xen-netback/interface.c
> index adfed30..ba5be2f 100644
> --- a/drivers/net/xen-netback/interface.c
> +++ b/drivers/net/xen-netback/interface.c
> @@ -252,6 +252,13 @@ static const struct xenvif_stat {
> "tx_zerocopy_fail",
> offsetof(struct xenvif, tx_zerocopy_fail)
> },
> + /* Number of packets exceeding MAX_SKB_FRAG slots. You should use
> + * a guest with the same MAX_SKB_FRAG
> + */
> + {
> + "tx_frag_overflow",
> + offsetof(struct xenvif, tx_frag_overflow)
> + },
This patch break bisection with a cause different than "unable to handle
too many frags", because previous patch makes use of this
tx_frag_overflow. It's harmless to merge this one into previous one.
> };
>
> static int xenvif_get_sset_count(struct net_device *dev, int
> string_set)
--
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