From patchwork Sun Mar 24 19:17:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Mark Cave-Ayland X-Patchwork-Id: 1915351 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=fail reason="signature verification failed" (4096-bit key; unprotected) header.d=ilande.co.uk header.i=@ilande.co.uk header.a=rsa-sha256 header.s=20220518 header.b=QgwLHof3; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4V2m8b04qMz1yXr for ; Mon, 25 Mar 2024 06:19:27 +1100 (AEDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1roTM8-0007Sh-38; Sun, 24 Mar 2024 15:18:08 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1roTM6-0007SG-Ce for qemu-devel@nongnu.org; Sun, 24 Mar 2024 15:18:06 -0400 Received: from mail.ilande.co.uk ([2001:41c9:1:41f::167]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1roTM4-0005MP-SB for qemu-devel@nongnu.org; Sun, 24 Mar 2024 15:18:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=ilande.co.uk; s=20220518; h=Subject:Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:To:From:Sender:Reply-To:Cc: Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=77dk6wnZ2bSAejWshvXrKexdiyTpCPKPvwX9iyAhCFE=; b=QgwLHof3v46EWCNARk4N4s9odV k1I1DB0DkfH4xP4qtXuxKDd/N1oQvJ+6uViyBVDqQV35WNZ6KsrYbhrum8NNXE7S4UxZ5ZkPYsiC0 FCdc+Q4l2Zug7bN+k2MTGkXmSXPQ1e6yEQkq+e+kSRcmVKh+IFpjibquXUuhq6SPYdbgGGz/ceLwp GIwOi0DesdBfRMS4pm1A2C8e5/1wVCnTmdPQdpmglfMw8DpedTK67fax9OHIgvSdOZQmdKV5JArUH RxLDuoIUjH4bZ/3YXJ88/sgXpg2sZiOdXQI97MLagSOQXRATGo/3KFB0xvG6e3io9BCYEm9z++4MI G6advuACBzGZ2Nn2iHShPrt5JAF/Bvn+0sIBGjztgl/PiHjgukXp5iQcTA1GqkltfCLQR4Pd6SkqU t8jKImG3Ewpdht+TNdAp0H/LUVPhoO06sdHAndgXJnidwTu7rIfiZWqSWGsiJpn2IXZm4O4Zenqkj WlgKjTFaK9Zf6KF2nMGJC706S86sxYarQDS3D2f3yH1/EXV3Bvr6RO8KrdeGDlBN+pW/l66BNf/g+ yYpWvy8EyNXMDAYHwski6E1u1EAfl6SXd0cQtnsI7zIt3O74Gd1QaMdkpKADPhdkyBkbLCBuqO6Yv CxP3bDBppmMg4ZJtkkbCRGWnya11n1/HLgz5j0nac=; Received: from [2a00:23c4:8bb3:1000:d8cc:63fe:ef32:8539] (helo=localhost.localdomain) by mail.ilande.co.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1roTL5-0000dj-EC; Sun, 24 Mar 2024 19:17:07 +0000 From: Mark Cave-Ayland To: pbonzini@redhat.com, fam@euphon.net, laurent@vivier.eu, qemu-devel@nongnu.org Date: Sun, 24 Mar 2024 19:17:00 +0000 Message-Id: <20240324191707.623175-12-mark.cave-ayland@ilande.co.uk> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240324191707.623175-1-mark.cave-ayland@ilande.co.uk> References: <20240324191707.623175-1-mark.cave-ayland@ilande.co.uk> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a00:23c4:8bb3:1000:d8cc:63fe:ef32:8539 X-SA-Exim-Mail-From: mark.cave-ayland@ilande.co.uk Subject: [PATCH v3 11/17] esp.c: rework esp_cdb_length() into esp_cdb_ready() X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on mail.ilande.co.uk) Received-SPF: pass client-ip=2001:41c9:1:41f::167; envelope-from=mark.cave-ayland@ilande.co.uk; helo=mail.ilande.co.uk X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org The esp_cdb_length() function is only used as part of a calculation to determine whether the cmdfifo contains an entire SCSI CDB. Rework esp_cdb_length() into a new esp_cdb_ready() function which both enables us to handle the case where scsi_cdb_length() returns -1, plus simplify the logic for its callers. Suggested-by: Paolo Bonzini Signed-off-by: Mark Cave-Ayland Reviewed-by: Philippe Mathieu-Daudé --- hw/scsi/esp.c | 30 ++++++++++++++---------------- 1 file changed, 14 insertions(+), 16 deletions(-) diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index f3aa5364cf..f47abc36d6 100644 --- a/hw/scsi/esp.c +++ b/hw/scsi/esp.c @@ -425,20 +425,20 @@ static void write_response(ESPState *s) } } -static int esp_cdb_length(ESPState *s) +static bool esp_cdb_ready(ESPState *s) { + int len = fifo8_num_used(&s->cmdfifo) - s->cmdfifo_cdb_offset; const uint8_t *pbuf; - int cmdlen, len; + int cdblen; - cmdlen = fifo8_num_used(&s->cmdfifo); - if (cmdlen < s->cmdfifo_cdb_offset) { - return 0; + if (len <= 0) { + return false; } - pbuf = fifo8_peek_buf(&s->cmdfifo, cmdlen, NULL); - len = scsi_cdb_length((uint8_t *)&pbuf[s->cmdfifo_cdb_offset]); + pbuf = fifo8_peek_buf(&s->cmdfifo, len, NULL); + cdblen = scsi_cdb_length((uint8_t *)&pbuf[s->cmdfifo_cdb_offset]); - return len; + return cdblen < 0 ? false : (len >= cdblen); } static void esp_dma_ti_check(ESPState *s) @@ -806,10 +806,9 @@ static void esp_do_nodma(ESPState *s) trace_esp_handle_ti_cmd(cmdlen); /* CDB may be transferred in one or more TI commands */ - if (esp_cdb_length(s) && esp_cdb_length(s) == - fifo8_num_used(&s->cmdfifo) - s->cmdfifo_cdb_offset) { - /* Command has been received */ - do_cmd(s); + if (esp_cdb_ready(s)) { + /* Command has been received */ + do_cmd(s); } else { /* * If data was transferred from the FIFO then raise bus @@ -832,10 +831,9 @@ static void esp_do_nodma(ESPState *s) fifo8_push_all(&s->cmdfifo, buf, len); /* Handle when DMA transfer is terminated by non-DMA FIFO write */ - if (esp_cdb_length(s) && esp_cdb_length(s) == - fifo8_num_used(&s->cmdfifo) - s->cmdfifo_cdb_offset) { - /* Command has been received */ - do_cmd(s); + if (esp_cdb_ready(s)) { + /* Command has been received */ + do_cmd(s); } break;