netdev - RE: [Patch bpf v2 7/7] skmsg: increase sk->sk

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Date:   Tue, 25 May 2021 21:22:38 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>, netdev@...r.kernel.org
Cc:     bpf@...r.kernel.org, Cong Wang <cong.wang@...edance.com>,
        John Fastabend <john.fastabend@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Lorenz Bauer <lmb@...udflare.com>
Subject: RE: [Patch bpf v2 7/7] skmsg: increase sk->sk_drops when dropping
 packets

Cong Wang wrote:
> From: Cong Wang <cong.wang@...edance.com>
> 
> It is hard to observe packet drops without increase relevant
> drop counters, here we should increase sk->sk_drops which is
> a protocol-independent counter. Fortunately psock is always
> assocaited with a struct sock, we can just use psock->sk.
> 
> Cc: John Fastabend <john.fastabend@...il.com>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: Jakub Sitnicki <jakub@...udflare.com>
> Cc: Lorenz Bauer <lmb@...udflare.com>
> Signed-off-by: Cong Wang <cong.wang@...edance.com>

[...]

>  static void sk_psock_backlog(struct work_struct *work)
>  {
>  	struct sk_psock *psock = container_of(work, struct sk_psock, work);
> @@ -617,7 +623,7 @@ static void sk_psock_backlog(struct work_struct *work)
>  				/* Hard errors break pipe and stop xmit. */
>  				sk_psock_report_error(psock, ret ? -ret : EPIPE);
>  				sk_psock_clear_state(psock, SK_PSOCK_TX_ENABLED);
> -				kfree_skb(skb);
> +				sock_drop(psock->sk, skb);
>  				goto end;
>  			}
>  			off += ret;
> @@ -625,7 +631,7 @@ static void sk_psock_backlog(struct work_struct *work)
>  		} while (len);
>  
>  		if (!ingress)
> -			kfree_skb(skb);
> +			sock_drop(psock->sk, skb);

This is not a dropped skb this was sent via skb_send_sock().

The rest LGTM thanks.