linux-kernel - Re: [PATCH] mptcp: unify MPTCP_PM_MAX_ADDR and MPTCP_PM_ADDR

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Date:   Fri, 12 Jun 2020 19:33:11 +0200
From:   Matthieu Baerts <matthieu.baerts@...sares.net>
To:     Geliang Tang <geliangtang@...il.com>
Cc:     Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        mptcp@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mptcp: unify MPTCP_PM_MAX_ADDR and MPTCP_PM_ADDR_MAX

Hi Geliang,

On 12/06/2020 07:27, Geliang Tang wrote:
> Unify these two duplicate macros into 8.

Thank you for this new patch!

(...)

> diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
> index 809687d3f410..86d265500cf6 100644
> --- a/net/mptcp/protocol.h
> +++ b/net/mptcp/protocol.h
> @@ -135,7 +135,7 @@ static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
>   		     ((nib & 0xF) << 8) | field);
>   }
>   
> -#define MPTCP_PM_MAX_ADDR	4
> +#define MPTCP_PM_ADDR_MAX	8

I think it would be better to drop MPTCP_PM_MAX_ADDR and keep 
MPTCP_PM_ADDR_MAX in pm_netlink.c where it is used. Each PM can decide 
what's the maximum number of addresses it can support.

MPTCP_PM_MAX_ADDR seems to be a left over from a previous implementation 
of a PM that has not been upstreamed but replaced by the Netlink PM later.

Also, please always add "net" or "net-next" prefix in the subject of 
your email to help -net maintainers. Do not hesitate to look at the 
netdev FAQ for more details.

Here this patch looks like a fix so you should have [PATCH net] and a 
"Fixes" tag. I guess for this patch you can use:

   Fixes: 1b1c7a0ef7f3 ("mptcp: Add path manager interface")

That's where MPTCP_PM_MAX_ADDR has been introduced. It was already not 
used and never used later.

Cheers,
Matt
-- 
Tessares | Belgium | Hybrid Access Solutions
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