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Date: Thu, 27 Jan 2022 08:53:04 -0700 From: David Ahern <dsahern@...il.com> To: menglong8.dong@...il.com, kuba@...nel.org Cc: nhorman@...driver.com, davem@...emloft.net, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, dsahern@...nel.org, rostedt@...dmis.org, Menglong Dong <imagedong@...cent.com>, Ido Schimmel <idosch@...sch.org> Subject: Re: [PATCH v3 net-next] net: drop_monitor: support drop reason On 1/26/22 8:33 PM, menglong8.dong@...il.com wrote: > From: Menglong Dong <imagedong@...cent.com> > > In the commit c504e5c2f964 ("net: skb: introduce kfree_skb_reason()") > drop reason is introduced to the tracepoint of kfree_skb. Therefore, > drop_monitor is able to report the drop reason to users by netlink. > > For now, the number of drop reason is passed to users ( seems it's > a little troublesome to pass the drop reason as string ). Therefore, > users can do some customized description of the reason. > > Signed-off-by: Menglong Dong <imagedong@...cent.com> > --- > v3: > - referring to cb->reason and cb->pc directly in > net_dm_packet_report_fill() > > v2: > - get a pointer to struct net_dm_skb_cb instead of local var for > each field > --- > include/uapi/linux/net_dropmon.h | 1 + > net/core/drop_monitor.c | 16 ++++++++++++---- > 2 files changed, 13 insertions(+), 4 deletions(-) > > diff --git a/include/uapi/linux/net_dropmon.h b/include/uapi/linux/net_dropmon.h > index 66048cc5d7b3..b2815166dbc2 100644 > --- a/include/uapi/linux/net_dropmon.h > +++ b/include/uapi/linux/net_dropmon.h > @@ -93,6 +93,7 @@ enum net_dm_attr { > NET_DM_ATTR_SW_DROPS, /* flag */ > NET_DM_ATTR_HW_DROPS, /* flag */ > NET_DM_ATTR_FLOW_ACTION_COOKIE, /* binary */ > + NET_DM_ATTR_REASON, /* u32 */ > For userspace to properly convert reason from id to string, enum skb_drop_reason needs to be moved from skbuff.h to a uapi file. include/uapi/linux/net_dropmon.h seems like the best candidate to me. Maybe others have a better idea.
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