From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay3-d.mail.gandi.net (relay3-d.mail.gandi.net [217.70.183.195]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 78DDB143C59 for ; Mon, 8 Apr 2024 20:28:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.195 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712608089; cv=none; b=U9+q6NocrAJQVHabJqYcRXxpnWpMhH/JR3IlJMut9DQ1xCiqEr247nKt/9KvFltEKxWn1tnnRHvzd5/LN5h6HwmfHWiHLiKTDbf9jXbGNKcXfijaUfGoP+qu/FUvlHq9a0GuWRqsdfjjEmWYIXwQ5hTeO/2lBUByuAubLfCNvDo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712608089; c=relaxed/simple; bh=ClRs1sz4Ife+PREHaGPcfx+2IFTJiUdUAKatY45YMwU=; h=Message-ID:Date:MIME-Version:Cc:Subject:To:References:From: In-Reply-To:Content-Type; b=NHaczg6/IpEW6o09Ll4My9ZfqVm/lWwlJJO3wHrxy2JagEH0JpLVGtebxp6MEXBU8WhpMBSUR3yP4lSq141ZrydaVE5riZx+40ZuapQdtweKUf0yXs7S5Gu4j2qAeBBj4uc5UetHwl2+hUWrmPBFkJm+SFXHeFSrMfeKleLyPoU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ovn.org; spf=pass smtp.mailfrom=ovn.org; arc=none smtp.client-ip=217.70.183.195 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ovn.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ovn.org Received: by mail.gandi.net (Postfix) with ESMTPSA id E035460002; Mon, 8 Apr 2024 20:27:57 +0000 (UTC) Message-ID: Date: Mon, 8 Apr 2024 22:28:40 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Cc: i.maximets@ovn.org, jiri@resnulli.us, xiyou.wangcong@gmail.com, cmi@nvidia.com, yotam.gi@gmail.com, aconole@redhat.com, echaudro@redhat.com, horms@kernel.org Subject: Re: [RFC net-next v2 3/5] net: psample: add user cookie Content-Language: en-US To: Adrian Moreno , netdev@vger.kernel.org References: <20240408125753.470419-1-amorenoz@redhat.com> <20240408125753.470419-4-amorenoz@redhat.com> <281c9e36-6a83-488e-b104-09d80aef83fc@ovn.org> From: Ilya Maximets Autocrypt: addr=i.maximets@ovn.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-GND-Sasl: i.maximets@ovn.org On 4/8/24 21:28, Adrian Moreno wrote: > > > On 4/8/24 15:19, Ilya Maximets wrote: >> [copying my previous reply since this version actually has netdev@ in Cc] >> >> On 4/8/24 14:57, Adrian Moreno wrote: >>> Add a user cookie to the sample metadata so that sample emitters can >>> provide more contextual information to samples. >>> >>> If present, send the user cookie in a new attribute: >>> PSAMPLE_ATTR_USER_COOKIE. >>> >>> Signed-off-by: Adrian Moreno >>> --- >>> include/net/psample.h | 2 ++ >>> include/uapi/linux/psample.h | 1 + >>> net/psample/psample.c | 12 +++++++++++- >>> 3 files changed, 14 insertions(+), 1 deletion(-) >>> >>> diff --git a/include/net/psample.h b/include/net/psample.h >>> index 0509d2d6be67..2503ab3c92a5 100644 >>> --- a/include/net/psample.h >>> +++ b/include/net/psample.h >>> @@ -25,6 +25,8 @@ struct psample_metadata { >>> out_tc_occ_valid:1, >>> latency_valid:1, >>> unused:5; >>> + u8 *user_cookie; >> >> The code doesn't take ownership of this data. It should probably >> be a const pointer in this case. >> >> This should also allow us to avoid a double copy first to the >> psample_metadata and then to netlink skb, as users will know that >> it is a const pointer and so they can hand the data directly. >> > > Yep. You're right. > > >>> + u32 user_cookie_len; BTW, u32 looks a little strange here and by extension in tc and OVS as well. We can't push move than 64K through netlink, AFAIK, so u16 should be plenty here. In practice, I hope, we'll not go over u8 though. Best regards, Ilya Maximets.