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Date: Sat, 17 Aug 2019 12:41:11 -0700 (PDT) From: David Miller <davem@...emloft.net> To: idosch@...sch.org Cc: netdev@...r.kernel.org, nhorman@...driver.com, jiri@...lanox.com, toke@...hat.com, dsahern@...il.com, roopa@...ulusnetworks.com, nikolay@...ulusnetworks.com, jakub.kicinski@...ronome.com, andy@...yhouse.net, f.fainelli@...il.com, andrew@...n.ch, vivien.didelot@...il.com, mlxsw@...lanox.com, idosch@...lanox.com Subject: Re: [PATCH net-next v3 00/16] Add drop monitor for offloaded data paths From: Ido Schimmel <idosch@...sch.org> Date: Sat, 17 Aug 2019 16:28:09 +0300 > Users have several ways to debug the kernel and understand why a packet > was dropped. For example, using drop monitor and perf. Both utilities > trace kfree_skb(), which is the function called when a packet is freed > as part of a failure. The information provided by these tools is > invaluable when trying to understand the cause of a packet loss. > > In recent years, large portions of the kernel data path were offloaded > to capable devices. Today, it is possible to perform L2 and L3 > forwarding in hardware, as well as tunneling (IP-in-IP and VXLAN). > Different TC classifiers and actions are also offloaded to capable > devices, at both ingress and egress. > > However, when the data path is offloaded it is not possible to achieve > the same level of introspection since packets are dropped by the > underlying device and never reach the kernel. > > This patchset aims to solve this by allowing users to monitor packets > that the underlying device decided to drop along with relevant metadata > such as the drop reason and ingress port. ... Looks great, series applied, thanks.
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