linux-kernel - Re: [PATCH net-next 1/3] ppp: convert rlock to rwlock to improve RX concurrency

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Message-ID: <224c4c68-6e6e-4109-9933-2ab1bdb5eedd@lunn.ch>
Date: Wed, 25 Jun 2025 10:11:35 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Qingfang Deng <dqfext@...il.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	linux-ppp@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Guillaume Nault <gnault@...hat.com>
Subject: Re: [PATCH net-next 1/3] ppp: convert rlock to rwlock to improve RX
 concurrency

>  #define ppp_xmit_lock(ppp)	spin_lock_bh(&(ppp)->wlock)
>  #define ppp_xmit_unlock(ppp)	spin_unlock_bh(&(ppp)->wlock)
> -#define ppp_recv_lock(ppp)	spin_lock_bh(&(ppp)->rlock)
> -#define ppp_recv_unlock(ppp)	spin_unlock_bh(&(ppp)->rlock)
> +#define ppp_recv_lock(ppp)	write_lock_bh(&(ppp)->rlock)
> +#define ppp_recv_unlock(ppp)	write_unlock_bh(&(ppp)->rlock)
>  #define ppp_lock(ppp)		do { ppp_xmit_lock(ppp); \
>  				     ppp_recv_lock(ppp); } while (0)
>  #define ppp_unlock(ppp)		do { ppp_recv_unlock(ppp); \
>  				     ppp_xmit_unlock(ppp); } while (0)
> +#define ppp_recv_read_lock(ppp)		read_lock_bh(&(ppp)->rlock)
> +#define ppp_recv_read_unlock(ppp)	read_unlock_bh(&(ppp)->rlock)

Given the _read_ in ppp_recv_read_lock(), maybe ppp_recv_lock() should
be ppp_recv_write_lock()? Makes it symmetrical, and clearer there is a
read/write lock.

	Andrew