netdev - Re: [PATCH v3 1/5] netlink: extended ACK reporting

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Message-Id: <20170411.150527.283014710949232666.davem@davemloft.net>
Date:   Tue, 11 Apr 2017 15:05:27 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     dsa@...ulusnetworks.com
Cc:     pablo@...filter.org, johannes@...solutions.net,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        jhs@...atatu.com, jbenc@...hat.com, jiri@...nulli.us
Subject: Re: [PATCH v3 1/5] netlink: extended ACK reporting

From: David Ahern <dsa@...ulusnetworks.com>
Date: Tue, 11 Apr 2017 12:57:59 -0600

> On 4/11/17 11:42 AM, David Miller wrote:
>> David, if you have a specific case where it's absolutely impossible
>> to resolve this when the library is converted to support extended
>> ACKs, please mention it.
> 
> I don't have a specific library in mind. It is more the disjoint nature
> of a socket option and message parsing, and thinking through the API.

Would you prefer it being passed via a control message at sendmsg()
time?  That would require more changes to userland programs, and also
increase the per-request overhead in the kernel as it parses this CMSG
every single time.

We have a setsockopt for AF_PACKET that changes the entire layout of
the packet mmap ring, nobody complains that libraries are hard to
implement because of that right?