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=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 D5FACC3F68F for ; Mon, 9 Dec 2019 17:32:06 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8DF4220828 for ; Mon, 9 Dec 2019 17:32:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="WuzMQxfU"; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="sRk23x/J" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8DF4220828 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: Content-Transfer-Encoding:Content-Type:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Q72cQM+3SI70k7ctcpb9LKDM8a7LAen8E8Vv2d4hTLo=; b=WuzMQxfUzXKsGW E2RnMQx8Sog0LpaWZSZLrfGmT6xWG008zU7sLvR0u5CCuW18/omfEKoKmlh5EVTcMGVZp41g/r6UD w/iD6JAssfF8zIru3QwM/ZmqKe4emvE5MkrZdeTW3lSH5Kb+SEJvg7XEUVFWS2v/LK/xD29WmMg7w 46+/IG8OUfGhvEa27sXORMXhnkL/zU1Gi6pAHLz4zZ915aEm6P5Rt/Ndbl2Oi3WfIxA1KSh1yCC3U US4uIORrePpWGVbA+N9FZb/dto107gESWOi76GFqb/hJf8nz3ZlJl06G/RIazTGO78aJjYmA9IyBQ 7a6438C0k8fS91j7g8qA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ieMtA-0004Om-4e; Mon, 09 Dec 2019 17:32:04 +0000 Received: from mail-pf1-x441.google.com ([2607:f8b0:4864:20::441]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1ieMt5-0004Jf-Us for linux-riscv@lists.infradead.org; Mon, 09 Dec 2019 17:32:01 +0000 Received: by mail-pf1-x441.google.com with SMTP id h14so7570464pfe.10 for ; Mon, 09 Dec 2019 09:31:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Q72cQM+3SI70k7ctcpb9LKDM8a7LAen8E8Vv2d4hTLo=; b=sRk23x/JpxVKbzZj54qVRUi2aIExQ0SRE7GqFLD/hMDxEVsFavaeMfS44RU6oiuXfb H0xi5LdEkduZ2iYCJYodCJF6Ing7Rv1IW8FMsyWVB2+sCdRzMHiUhKXmMg3xSMH6nHsX ayoDJZab2LVWXwXub2wg/AlQtXMlEvPjhk8JTyMAKviCRlRECgURo0yOcgepZ2IDOykr W3UsS2Gn8bgOe6SddLX7KSOBEYFK9IYdxMuaWv45tRXpfXQSmLLWywYTazar2mRObXn5 1loXAYvQ7kzXfJ7qWWqSuEMjX6mcN+A83MnD5l6sHk/M+WOUax9WPdqqaHvnilPlsfcj gSCg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Q72cQM+3SI70k7ctcpb9LKDM8a7LAen8E8Vv2d4hTLo=; b=bCi+vUSOaFDC5inZaJsVAuqQ1T/wTlgLtRK2Z9l15oOUmXKYjnJTLB4vnHD1FiWAiu 91FlMt5n5AIjspDC8KxbvhS0euMxDsWRK8PjqlOXL9CdbotPKr/idMYznjojkBfoLmNy rMZlSl5Ku8UgA1waxAduJX/XP8ltL8W0kue0NtWL742gSbEwBswnqVGE3n5MVAOahdpv 9Q5JV8stjDOsLa5sSQGzMjkzBc+DhfAJ7aPnOKbZeLPyDabydkvs0mSvegEvz5hV3WWj RA+aQEbGM3Zxs8lXW07EuVxMcI7rMRySy24IBeupNyI1vicuYyabplTW4WbVzZnd3XWd oOcQ== X-Gm-Message-State: APjAAAVKJomFIw6bTxxLODBRgM9TlTBKbhJUigkxYFVnYXPfbonIyvq+ DxD1iTTZCQl2w7YsojnhSMI= X-Google-Smtp-Source: APXvYqxlMvkVuCdFoizkUk0kiP7e9NabguDeK3+5YeBoqX6bG5u2+aRmcgQwBwQtLnS2H8IY30slww== X-Received: by 2002:a63:d501:: with SMTP id c1mr19227970pgg.356.1575912719116; Mon, 09 Dec 2019 09:31:59 -0800 (PST) Received: from btopel-mobl.ger.intel.com ([192.55.55.41]) by smtp.gmail.com with ESMTPSA id d23sm54943pfo.176.2019.12.09.09.31.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Dec 2019 09:31:58 -0800 (PST) From: =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= To: daniel@iogearbox.net, ast@kernel.org, netdev@vger.kernel.org Subject: [PATCH bpf-next 4/8] riscv, bpf: optimize BPF tail calls Date: Mon, 9 Dec 2019 18:31:32 +0100 Message-Id: <20191209173136.29615-5-bjorn.topel@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191209173136.29615-1-bjorn.topel@gmail.com> References: <20191209173136.29615-1-bjorn.topel@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191209_093200_037154_32676E6E X-CRM114-Status: UNSURE ( 9.66 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , linux-riscv@lists.infradead.org, bpf@vger.kernel.org Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org Remove one addi, and instead use the offset part of jalr. Signed-off-by: Björn Töpel --- arch/riscv/net/bpf_jit_comp.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/arch/riscv/net/bpf_jit_comp.c b/arch/riscv/net/bpf_jit_comp.c index e9cc9832ac2c..cbcb33613d1d 100644 --- a/arch/riscv/net/bpf_jit_comp.c +++ b/arch/riscv/net/bpf_jit_comp.c @@ -562,7 +562,7 @@ static int epilogue_offset(struct rv_jit_context *ctx) return (to - from) << 2; } -static void __build_epilogue(u8 reg, struct rv_jit_context *ctx) +static void __build_epilogue(bool is_tail_call, struct rv_jit_context *ctx) { int stack_adjust = ctx->stack_size, store_offset = stack_adjust - 8; @@ -599,9 +599,11 @@ static void __build_epilogue(u8 reg, struct rv_jit_context *ctx) emit(rv_addi(RV_REG_SP, RV_REG_SP, stack_adjust), ctx); /* Set return value. */ - if (reg == RV_REG_RA) + if (!is_tail_call) emit(rv_addi(RV_REG_A0, RV_REG_A5, 0), ctx); - emit(rv_jalr(RV_REG_ZERO, reg, 0), ctx); + emit(rv_jalr(RV_REG_ZERO, is_tail_call ? RV_REG_T3 : RV_REG_RA, + is_tail_call ? 4 : 0), /* skip TCC init */ + ctx); } static void emit_zext_32(u8 reg, struct rv_jit_context *ctx) @@ -664,9 +666,8 @@ static int emit_bpf_tail_call(int insn, struct rv_jit_context *ctx) if (is_12b_check(off, insn)) return -1; emit(rv_ld(RV_REG_T3, off, RV_REG_T2), ctx); - emit(rv_addi(RV_REG_T3, RV_REG_T3, 4), ctx); emit(rv_addi(RV_REG_TCC, RV_REG_T1, 0), ctx); - __build_epilogue(RV_REG_T3, ctx); + __build_epilogue(true, ctx); return 0; } @@ -1520,7 +1521,7 @@ static void build_prologue(struct rv_jit_context *ctx) static void build_epilogue(struct rv_jit_context *ctx) { - __build_epilogue(RV_REG_RA, ctx); + __build_epilogue(false, ctx); } static int build_body(struct rv_jit_context *ctx, bool extra_pass) -- 2.20.1