From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by passt.top (Postfix) with ESMTP id 425415A027E for ; Thu, 15 Feb 2024 18:41:39 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1708018898; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=2nt51Mgp2aV8+Qg96ITupHU3npusE6ImfhDZbMjyfXc=; b=aSPMr27YxRRE1SrfYL2vPd1bmOgVaPJjXA7ntcFjfE3YBVTQ7lbNKqGGhUjw+aYZu2A+8p A9TNkgYddHcOJ4zprMqS4Fp0lLEFf+nQFcaA4UZOqKelDhYdKHO54uEmsI3Rtqd9U6OJpD a4sS0QnPDVFUiZuLRulzsDOOpioTDro= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-211-dia4M4MJO_-bw1ismjX99g-1; Thu, 15 Feb 2024 12:41:21 -0500 X-MC-Unique: dia4M4MJO_-bw1ismjX99g-1 Received: by mail-wm1-f69.google.com with SMTP id 5b1f17b1804b1-40e4303fceaso2385235e9.1 for ; Thu, 15 Feb 2024 09:41:20 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1708018880; x=1708623680; h=mime-version:user-agent:content-transfer-encoding:autocrypt :references:in-reply-to:date:cc:to:from:subject:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=2nt51Mgp2aV8+Qg96ITupHU3npusE6ImfhDZbMjyfXc=; b=DL6/Y8g9Z9WoKxcywd+Eo987hZSJdaSj8Vl0iWw1z/ajyNCd1py3LCs6lSYcyCOMKQ LiqZEWtPFiBYXvrC3hlnVshcT2Qt1t1zItY0JzrxjpSz6OM3JDbkV1Aq68LqOcrGyiZI GBr+sZSH9YUQOmXeLXIzhwkdMfQdhYvwWilKmI1ymHrGZ/QlsDW0dtX3CIgrGHbN6LXj PRCvejmzZBov/9RGUQYks+TKGPT4k6PfMbqPLAa0lRJyka+5Rd8ZEljbz/5JAtNvQnSx On/i5PzHg3Bd2qH0Jezt3lg4giK7gIRGF0wY+TGgRXLPJnnW0vktjzQdGiGuyToF/Ral bmXQ== X-Forwarded-Encrypted: i=1; AJvYcCVCawcoWxuelaqZvo6fy5v+sZBT4HXyV8IZx6D/ZPHR6E1JcUmMFyOz/CkkgR8OegXCK+KmtDTS2dgJlsKDYreOFP4y X-Gm-Message-State: AOJu0YyOMi5H6YuKr7hvRjqJ3hCYdp2KKPAvd8Bu+hL1OKw7sOEqeUGC QTWbfiEDAF9zrG8Tb8Vpe984uMzW0ukB7iCLpf5xaKt5bPpig6UeEskYyDuMIPefM1pKngFtZll o48MBkj+58kU5ZlZvVesdj6nkNg1/fiuxXY1IysKAv/A3yoIh+g== X-Received: by 2002:a05:6000:69a:b0:33b:10ca:d85b with SMTP id bo26-20020a056000069a00b0033b10cad85bmr1801387wrb.5.1708018879982; Thu, 15 Feb 2024 09:41:19 -0800 (PST) X-Google-Smtp-Source: AGHT+IF6gPozbzyteRDfoEzFbq1eXrFspX+afEVA859A+jRqzLM37iUUdnBaTE+oiRXKJQ7ni1evpQ== X-Received: by 2002:a05:6000:69a:b0:33b:10ca:d85b with SMTP id bo26-20020a056000069a00b0033b10cad85bmr1801376wrb.5.1708018879651; Thu, 15 Feb 2024 09:41:19 -0800 (PST) Received: from gerbillo.redhat.com (146-241-227-156.dyn.eolo.it. [146.241.227.156]) by smtp.gmail.com with ESMTPSA id ay14-20020a5d6f0e000000b0033b2799815csm2648744wrb.86.2024.02.15.09.41.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Feb 2024 09:41:19 -0800 (PST) Message-ID: <178b9f2dbb3c56fcfef46a97ea395bdd13ebfb59.camel@redhat.com> Subject: Re: [PATCH v3] tcp: add support for SO_PEEK_OFF From: Paolo Abeni To: Jon Maloy , Eric Dumazet Date: Thu, 15 Feb 2024 18:41:17 +0100 In-Reply-To: <20687849-ec5c-9ce5-0a18-cc80f5b64816@redhat.com> References: <20240209221233.3150253-1-jmaloy@redhat.com> <8d77d8a4e6a37e80aa46cd8df98de84714c384a5.camel@redhat.com> <20072ba530b34729589a3d527c420a766b49e205.camel@redhat.com> <725a92b4813242549f2316e6682d3312b5e658d8.camel@redhat.com> <20687849-ec5c-9ce5-0a18-cc80f5b64816@redhat.com> Autocrypt: addr=pabeni@redhat.com; prefer-encrypt=mutual; keydata=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 7ZxN9ZsDL38qVIuFkSpgMZCiUHdxBC11J8nbBSLlpnc924UAyr5XrGA99 6Wl5I4Km3128GY6iAkH54pZpOmpoUyBjcxbJWHstzmvyiXrjA2sMzYjt3Xkqp0cJfIEekOi75wnNPofEEJg28XPcFrpkMUFFvB4Aqrdc2yyR8Y36rbw18sIX3dJdomIP3dL7LoJi9mfUKOnr86Z0xltgcLPGYoCiUZMlXyWgB2IPmmcMP2jLJrusICjZxLYJJLofEjznAJSUEwB/3rlvFrSYvkKkVmfnfro5XEr5nStVTECxfy7RTtltwih85LlZEHP8eJWMUDj3P4Q9CWNgz2pWr1t68QuPHWaA+PrXyasDlcRpRXHZCOcvsKhAaCOG8TzCrutOZ5NxdfXTe3f1jVIEab7lNgr+7HiNVS+UPRzmvBc73DAyToKQBn9kC4jh9HoWyYTepjdcxnio0crmara+/HEyRZDQeOzSexf85I4dwxcdPKXv0fmLtxrN57Ae82bHuRlfeTuDG3x3vl/Bjx4O7Lb+oN2BLTmgpYq7V1WJPUwikZg8M+nvDNcsOoWGbU417PbHHn3N7yS0lLGoCCWyrK1OY0QM4EVsL3TjOfUtCNQYW9sbyBBYmVuaSA8cGFvbG8uYWJlbmlAZ21haWwuY29tPokCUgQTAQgAPBYhBINQI6gu+8G3S19i2ykkeY3MjxOkBQJiEoitAhsDBQsJCAcCAyICAQYVCgkICwIEFgIDAQIeBwIXgAAKCRApJHmNzI8TpBzHD/45pUctaCnhee1vkQnmStAYvHmwrWwIEH1lzDMDCpJQHTUQOOJWDAZOFnE/67bxSS81Wie0OKW2jvg1ylmpBA0gPpnzIExQmfP72cQ1TBoeVColVT6Io35BINn+ymM7c0Bn8RvngSEpr3jBtqvvWXjvtnJ5/HbOVQCg62NC6ewosoKJPWpGXMJ9SKsVIOUHsmoWK60spzeiJoSmAwm3zTJQnM5kRh2q iWjoCy8L35zPqR5TV+f5WR5hTVCqmLHSgm1jxwKhPg9L+GfuE4d0SWd84y 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 sD2W1U7eyLdm/jCgticGDsRtweytsgCSYfbz0gdgUuL3EBYN3JLbAU+UZpy 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 User-Agent: Evolution 3.50.3 (3.50.3-1.fc39) MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-MailFrom: pabeni@redhat.com X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation Message-ID-Hash: FANB7AVB4PAXDM5AZ7KUOURHNOYOXCZ2 X-Message-ID-Hash: FANB7AVB4PAXDM5AZ7KUOURHNOYOXCZ2 X-Mailman-Approved-At: Thu, 15 Feb 2024 19:32:10 +0100 CC: kuba@kernel.org, passt-dev@passt.top, sbrivio@redhat.com, lvivier@redhat.com, dgibson@redhat.com, netdev@vger.kernel.org, davem@davemloft.net X-Mailman-Version: 3.3.8 Precedence: list List-Id: Development discussion and patches for passt Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: Note: please send text-only email to netdev. On Thu, 2024-02-15 at 10:11 -0500, Jon Maloy wrote: > I wonder if the following could be acceptable: >=20 > =C2=A0if (flags & MSG_PEEK) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 sk_peek_offset_fwd(sk, used); > =C2=A0else if (peek_offset > 0) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 sk_peek_offset_bwd(sk, used); >=20 > =C2=A0peek_offset is already present in the data cache, and if it has the= value > =C2=A0zero it means either that that sk->sk_peek_off is unused (-1) or ac= tually is zero. > =C2=A0Either way, no rewind is needed in that case. I agree the above should avoid touching cold cachelines in the fastpath, and looks functionally correct to me. The last word is up to Eric :) Cheers, Paolo