netdev - Re: [net-next PATCH v5 3/7] net: sock: Change tx_queue_mapping in sock

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Date:   Fri, 29 Jun 2018 22:05:11 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     amritha.nambiar@...el.com
Cc:     netdev@...r.kernel.org, alexander.h.duyck@...el.com,
        willemdebruijn.kernel@...il.com, sridhar.samudrala@...el.com,
        alexander.duyck@...il.com, edumazet@...gle.com,
        hannes@...essinduktion.org, tom@...bertland.com, tom@...ntonium.net
Subject: Re: [net-next PATCH v5 3/7] net: sock: Change tx_queue_mapping in
 sock_common to unsigned short

From: Amritha Nambiar <amritha.nambiar@...el.com>
Date: Wed, 27 Jun 2018 15:31:28 -0700

> @@ -1681,17 +1681,25 @@ static inline int sk_receive_skb(struct sock *sk, struct sk_buff *skb,
>  
>  static inline void sk_tx_queue_set(struct sock *sk, int tx_queue)
>  {
> +	/* sk_tx_queue_mapping accept only upto a 16-bit value */
> +	if (WARN_ON_ONCE((unsigned short)tx_queue > USHRT_MAX))
> +		return;
>  	sk->sk_tx_queue_mapping = tx_queue;
>  }
>  
> +#define NO_QUEUE_MAPPING	USHRT_MAX

I think you need to check ">= USHRT_MAX" since USHRT_MAX is how you
indicate no queue.