From patchwork Mon Mar 2 07:40:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 1247483 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: 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=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=f9W0F054; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 48WBvv6z15z9sP7 for ; Mon, 2 Mar 2020 18:43:23 +1100 (AEDT) Received: from localhost ([::1]:56000 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j8fjV-0008Ib-LS for incoming@patchwork.ozlabs.org; Mon, 02 Mar 2020 02:43:21 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:60146) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j8fhM-00046E-VL for qemu-devel@nongnu.org; Mon, 02 Mar 2020 02:41:10 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j8fhL-0003ZV-Nw for qemu-devel@nongnu.org; Mon, 02 Mar 2020 02:41:08 -0500 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:56584 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1j8fhL-0003ZM-Jy for qemu-devel@nongnu.org; Mon, 02 Mar 2020 02:41:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583134867; 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; bh=XbaZZadeEkAqeV8qb2+C5LgL/ogdsMt/MVvvFGwr/Ao=; b=f9W0F054COjYN30ota+6fSxLVX7dGzhD6xfu1CJHcWLsLUxiPr8l3hHg2divGPozifuOH5 uCmVJgagNKt8nbkwRUkxGqVfTaG6x/MYq0dWBkPXvgheWXx4ClfHvIamCEjobZ54Efq3ex RsIhkX+0IbVdyxze009XFXbqhHwMmwM= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-294-UOr-BAt5MaCMTPt8u8x5Ww-1; Mon, 02 Mar 2020 02:41:05 -0500 X-MC-Unique: UOr-BAt5MaCMTPt8u8x5Ww-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E2C07DB60; Mon, 2 Mar 2020 07:41:03 +0000 (UTC) Received: from jason-ThinkPad-T430s.redhat.com (ovpn-12-58.pek2.redhat.com [10.72.12.58]) by smtp.corp.redhat.com (Postfix) with ESMTP id 47E6860C05; Mon, 2 Mar 2020 07:41:02 +0000 (UTC) From: Jason Wang To: peter.maydell@linaro.org Subject: [PULL 10/23] dp8393x: Pad frames to word or long word boundary Date: Mon, 2 Mar 2020 15:40:23 +0800 Message-Id: <1583134836-23991-11-git-send-email-jasowang@redhat.com> In-Reply-To: <1583134836-23991-1-git-send-email-jasowang@redhat.com> References: <1583134836-23991-1-git-send-email-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.61 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jason Wang , qemu-devel@nongnu.org, Finn Thain Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Finn Thain The existing code has a bug where the Remaining Buffer Word Count (RBWC) is calculated with a truncating division, which gives the wrong result for odd-sized packets. Section 1.4.1 of the datasheet says, Once the end of the packet has been reached, the serializer will fill out the last word (16-bit mode) or long word (32-bit mode) if the last byte did not end on a word or long word boundary respectively. The fill byte will be 0FFh. Implement buffer padding so that buffer limits are correctly enforced. Signed-off-by: Finn Thain Tested-by: Laurent Vivier Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Jason Wang --- hw/net/dp8393x.c | 39 ++++++++++++++++++++++++++++----------- 1 file changed, 28 insertions(+), 11 deletions(-) diff --git a/hw/net/dp8393x.c b/hw/net/dp8393x.c index d8bf248..22b4d36 100644 --- a/hw/net/dp8393x.c +++ b/hw/net/dp8393x.c @@ -768,16 +768,23 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf, dp8393xState *s = qemu_get_nic_opaque(nc); int packet_type; uint32_t available, address; - int width, rx_len = pkt_size; + int width, rx_len, padded_len; uint32_t checksum; int size; - width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1; - s->regs[SONIC_RCR] &= ~(SONIC_RCR_PRX | SONIC_RCR_LBK | SONIC_RCR_FAER | SONIC_RCR_CRCR | SONIC_RCR_LPKT | SONIC_RCR_BC | SONIC_RCR_MC); - if (pkt_size + 4 > dp8393x_rbwc(s) * 2) { + rx_len = pkt_size + sizeof(checksum); + if (s->regs[SONIC_DCR] & SONIC_DCR_DW) { + width = 2; + padded_len = ((rx_len - 1) | 3) + 1; + } else { + width = 1; + padded_len = ((rx_len - 1) | 1) + 1; + } + + if (padded_len > dp8393x_rbwc(s) * 2) { DPRINTF("oversize packet, pkt_size is %d\n", pkt_size); s->regs[SONIC_ISR] |= SONIC_ISR_RBAE; dp8393x_update_irq(s); @@ -812,22 +819,32 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf, s->regs[SONIC_TRBA0] = s->regs[SONIC_CRBA0]; /* Calculate the ethernet checksum */ - checksum = cpu_to_le32(crc32(0, buf, rx_len)); + checksum = cpu_to_le32(crc32(0, buf, pkt_size)); /* Put packet into RBA */ DPRINTF("Receive packet at %08x\n", dp8393x_crba(s)); address = dp8393x_crba(s); address_space_write(&s->as, address, MEMTXATTRS_UNSPECIFIED, - buf, rx_len); - address += rx_len; + buf, pkt_size); + address += pkt_size; + + /* Put frame checksum into RBA */ address_space_write(&s->as, address, MEMTXATTRS_UNSPECIFIED, - &checksum, 4); - address += 4; - rx_len += 4; + &checksum, sizeof(checksum)); + address += sizeof(checksum); + + /* Pad short packets to keep pointers aligned */ + if (rx_len < padded_len) { + size = padded_len - rx_len; + address_space_rw(&s->as, address, MEMTXATTRS_UNSPECIFIED, + (uint8_t *)"\xFF\xFF\xFF", size, 1); + address += size; + } + s->regs[SONIC_CRBA1] = address >> 16; s->regs[SONIC_CRBA0] = address & 0xffff; available = dp8393x_rbwc(s); - available -= rx_len / 2; + available -= padded_len >> 1; s->regs[SONIC_RBWC1] = available >> 16; s->regs[SONIC_RBWC0] = available & 0xffff;