From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2156C43603 for ; Tue, 10 Dec 2019 05:31:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B3174206D5 for ; Tue, 10 Dec 2019 05:31:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="tQ7NTeRH" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726018AbfLJFbl (ORCPT ); Tue, 10 Dec 2019 00:31:41 -0500 Received: from mail-qt1-f194.google.com ([209.85.160.194]:42421 "EHLO mail-qt1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725857AbfLJFbl (ORCPT ); Tue, 10 Dec 2019 00:31:41 -0500 Received: by mail-qt1-f194.google.com with SMTP id j5so1675354qtq.9; Mon, 09 Dec 2019 21:31:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=0i5fqFii9h3zbWBDVAysAxtbLv8smZHCpf4SOKLHP/I=; b=tQ7NTeRHAxaLNx6IHMXSqyBmJf1gYVzude/M4QCDh2PlbjUzZWSuF/VGZ9HZuZ1qY/ zRqG2q0O57zGo8OLc0aTt6cCoy+v728+FGFWdR3q4NrKc5WjmIkVRMxG3os3wTy71PiT e55ZNE+XG6nCfbyKVpnAkgeeWKHlZNhRQ2pyspfAXPPPcwlx3Qs98vs4K8I4qosdW2Ro qXfg99EKHSV0wBEGiSKUoP68UcF8Tv322d+Fl7Bw1C8DmiHyVq1vju8tDJqkLReeaFH6 To+/5yzd/3j/0Rho77UBs+d9oMyT6eJTf2RTUyhuCIWKAECYHrVRoV5LGRzBUpHvrYq3 P/AA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=0i5fqFii9h3zbWBDVAysAxtbLv8smZHCpf4SOKLHP/I=; b=ViTHB/SypBe42WaZDzQkCSEIIK92PfDKFQVrUXfGGaL1l/N+idQJzpePShA0XFQ+Mr TSPls5iehU4bCBbJIURz+SvQPrFm/pnsvkwG61o22AAzee49/VzVgtne6Thdl2y1d0oD 8nfFrSxnIZf5yIiItwA0T17/QJ2RENuVWVa+4IcLQBISBU3OPYACak/uyal8koZeil7k XncmLmAYQ7Ck3gNKWah0PqnIUkk6Ko3xLq7C01wxeJd5YsL4iTD9e1dxkjDA2308m5b2 fS/nwkJeNiS27teCwMrqGFVlqZ499wB6R6QRhi8gL1rrAWIOt9BuzaU5ETPGmjqLf78D 4wsA== X-Gm-Message-State: APjAAAUCo/LNIcfbzhT+57CZp+NV+Aothuh3/dhSJ/ZYQnyeeo0CbXQX HAES4hpGj0ckSSv0/XZvpVgrypU5FGeftj94pIs= X-Google-Smtp-Source: APXvYqyt0Hno3XoOYazUzPfoq8HIUPXgg2qVyO9UxGrvCfIciJG9wGyISvcyjdvUm+i1pmUEpuEObOvV8wUJni1oyws= X-Received: by 2002:ac8:2310:: with SMTP id a16mr28240964qta.46.1575955899915; Mon, 09 Dec 2019 21:31:39 -0800 (PST) MIME-Version: 1.0 References: <20191209173136.29615-1-bjorn.topel@gmail.com> <20191209173136.29615-3-bjorn.topel@gmail.com> In-Reply-To: <20191209173136.29615-3-bjorn.topel@gmail.com> From: =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= Date: Tue, 10 Dec 2019 06:31:28 +0100 Message-ID: Subject: Re: [PATCH bpf-next 2/8] riscv, bpf: add support for far branching To: Daniel Borkmann , Alexei Starovoitov , Netdev Cc: linux-riscv@lists.infradead.org, bpf Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On Mon, 9 Dec 2019 at 18:31, Bj=C3=B6rn T=C3=B6pel = wrote: > > This commit adds branch relaxation to the BPF JIT, and with that > support for far (offset greater than 12b) branching. > > The branch relaxation requires more than two passes to converge. For > most programs it is three passes, but for larger programs it can be > more. > > Signed-off-by: Bj=C3=B6rn T=C3=B6pel > --- > arch/riscv/net/bpf_jit_comp.c | 352 ++++++++++++++++++---------------- [...] > +} > + > +static void emit_branch(u8 cond, u8 rd, u8 rs, int insn, int rvoff, The "insn" is not used. I'll do a respin.