netdev - Re: [PATCH net-next] net: drop_monitor: support drop reason

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Message-ID: <20220125193826.58ee023f@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Tue, 25 Jan 2022 19:38:26 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     menglong8.dong@...il.com
Cc:     nhorman@...driver.com, davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, dsahern@...nel.org,
        rostedt@...dmis.org, Menglong Dong <imagedong@...cent.com>
Subject: Re: [PATCH net-next] net: drop_monitor: support drop reason

On Mon, 24 Jan 2022 15:59:55 +0800 menglong8.dong@...il.com wrote:
> @@ -606,6 +608,7 @@ static int net_dm_packet_report_in_port_put(struct sk_buff *msg, int ifindex,
>  static int net_dm_packet_report_fill(struct sk_buff *msg, struct sk_buff *skb,
>  				     size_t payload_len)
>  {
> +	enum skb_drop_reason reason = NET_DM_SKB_CB(skb)->reason;
>  	u64 pc = (u64)(uintptr_t) NET_DM_SKB_CB(skb)->pc;

nit: maybe it's better to get a pointer to struct net_dm_skb_cb here
instead of local var for each field?

>  	char buf[NET_DM_MAX_SYMBOL_LEN];
>  	struct nlattr *attr;
> @@ -623,6 +626,9 @@ static int net_dm_packet_report_fill(struct sk_buff *msg, struct sk_buff *skb,
>  	if (nla_put_u64_64bit(msg, NET_DM_ATTR_PC, pc, NET_DM_ATTR_PAD))
>  		goto nla_put_failure;
>  
> +	if (nla_put_u32(msg, NET_DM_ATTR_REASON, reason))
> +		goto nla_put_failure;