netdev - [PATCH net-next v4 0/5] netlink extended ACK reporting

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Date:   Tue, 11 Apr 2017 08:56:55 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Cc:     pablo@...filter.org, Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Benc <jbenc@...hat.com>,
        David Ahern <dsa@...ulusnetworks.com>, jiri@...nulli.us
Subject: [PATCH net-next v4 0/5] netlink extended ACK reporting

Changes since v3:
 * Add NLM_F_CAPPED and NLM_F_ACK_TLVS flags, to allow entirely
   stateless parsing of the ACK messages by looking at the new
   flags. Need to check NLM_F_ACK_TLVS first, since capping can
   be done in kernels before this patchset without setting the
   flag.
 * Remove "missing_attr" functionality - this can obviously be
   added back rather easily, but I'd rather have more discussion
   about the nesting problem there.
 * Improve documentation of NLMSGERR_ATTR_OFFS
 * Improve message structure documentation, documenting that the
   request message is always capped for success cases
 * fix nlmsg_len of the outer message by calling nlmsg_end()
 * fix memcpy() of the request in success cases, going back to
   the original code that I'd changed before due to the payload
   adjustments that I reverted when introducing tlvlen

Big thanks to David Ahern for the feedback from changing iproute2!

Patch for iw demonstrating the stateless parsing is here:
https://p.sipsolutions.net/93ae7ea3afbba8d6.txt

johannes