From patchwork Wed Jan 29 09:27:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Finn Thain X-Patchwork-Id: 11355755 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A825692A for ; Wed, 29 Jan 2020 09:37:53 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 88C5F2070E for ; Wed, 29 Jan 2020 09:37:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 88C5F2070E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=telegraphics.com.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:43276 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iwjnE-0000GT-Lv for patchwork-qemu-devel@patchwork.kernel.org; Wed, 29 Jan 2020 04:37:52 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:51443) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iwjl4-0003bd-G8 for qemu-devel@nongnu.org; Wed, 29 Jan 2020 04:35:39 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iwjl3-0000n3-Dt for qemu-devel@nongnu.org; Wed, 29 Jan 2020 04:35:38 -0500 Received: from kvm5.telegraphics.com.au ([98.124.60.144]:50072) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1iwjl3-0000kD-9O; Wed, 29 Jan 2020 04:35:37 -0500 Received: by kvm5.telegraphics.com.au (Postfix, from userid 502) id AD76D299C7; Wed, 29 Jan 2020 04:35:35 -0500 (EST) To: Jason Wang , qemu-devel@nongnu.org Message-Id: In-Reply-To: References: From: Finn Thain Subject: [PATCH v4 11/14] dp8393x: Clear descriptor in_use field to release packet Date: Wed, 29 Jan 2020 20:27:49 +1100 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 98.124.60.144 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: =?utf-8?q?Herv=C3=A9_Poussineau?= , Aleksandar Rikalo , =?utf-8?q?Philippe_Mathieu?= =?utf-8?q?-Daud=C3=A9?= , Laurent Vivier , qemu-stable@nongnu.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" When the SONIC receives a packet into the last available descriptor, it retains ownership of that descriptor for as long as necessary. Section 3.4.7 of the datasheet says, When the system appends more descriptors, the SONIC releases ownership of the descriptor after writing 0000h to the RXpkt.in_use field. The packet can now be processed by the host, so raise a PKTRX interrupt, just like the normal case. Signed-off-by: Finn Thain Tested-by: Laurent Vivier --- Changed since v2: - Assert PKTRX interrupt when releasing withheld packet. --- hw/net/dp8393x.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/hw/net/dp8393x.c b/hw/net/dp8393x.c index 13513986f0..99c5dad7c4 100644 --- a/hw/net/dp8393x.c +++ b/hw/net/dp8393x.c @@ -809,7 +809,17 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf, return -1; } /* Link has been updated by host */ + + /* Clear in_use */ + size = sizeof(uint16_t) * width; + address = dp8393x_crda(s) + sizeof(uint16_t) * 6 * width; + dp8393x_put(s, width, 0, 0); + address_space_rw(&s->as, address, MEMTXATTRS_UNSPECIFIED, + (uint8_t *)s->data, size, 1); + + /* Move to next descriptor */ s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA]; + s->regs[SONIC_ISR] |= SONIC_ISR_PKTRX; } /* Save current position */