From patchwork Mon Mar 21 16:25:22 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Huth X-Patchwork-Id: 600184 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3qTLmy5FCgz9s2Q for ; Tue, 22 Mar 2016 03:26:26 +1100 (AEDT) Received: from localhost ([::1]:58881 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ai2eu-0000Vi-4B for incoming@patchwork.ozlabs.org; Mon, 21 Mar 2016 12:26:24 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60177) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ai2e4-0007ke-Sj for qemu-devel@nongnu.org; Mon, 21 Mar 2016 12:25:37 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ai2e2-0000sf-Gd for qemu-devel@nongnu.org; Mon, 21 Mar 2016 12:25:32 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58673) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ai2e2-0000sX-94; Mon, 21 Mar 2016 12:25:30 -0400 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) by mx1.redhat.com (Postfix) with ESMTPS id DF6BD90E44; Mon, 21 Mar 2016 16:25:29 +0000 (UTC) Received: from thh440s.str.redhat.com. (dhcp-192-192.str.redhat.com [10.33.192.192]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u2LGPP05012884; Mon, 21 Mar 2016 12:25:28 -0400 From: Thomas Huth To: qemu-devel@nongnu.org, David Gibson , Alexander Graf Date: Mon, 21 Mar 2016 17:25:22 +0100 Message-Id: <1458577524-3734-2-git-send-email-thuth@redhat.com> In-Reply-To: <1458577524-3734-1-git-send-email-thuth@redhat.com> References: <1458577524-3734-1-git-send-email-thuth@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.27 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: lvivier@redhat.com, Alexey Kardashevskiy , Jason Wang , qemu-ppc@nongnu.org Subject: [Qemu-devel] [PATCH v2 1/3] hw/net/spapr_llan: Extract rx buffer code into separate functions X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 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 Refactor the code a little bit by extracting the code that reads and writes the receive buffer list page into separate functions. There should be no functional change in this patch, this is just a preparation for the upcoming extensions that introduce receive buffer pools. Signed-off-by: Thomas Huth Reviewed-by: David Gibson Reviewed-by: Laurent Vivier --- hw/net/spapr_llan.c | 106 ++++++++++++++++++++++++++++++++++------------------ 1 file changed, 70 insertions(+), 36 deletions(-) diff --git a/hw/net/spapr_llan.c b/hw/net/spapr_llan.c index 5237b4d..39a1dd1 100644 --- a/hw/net/spapr_llan.c +++ b/hw/net/spapr_llan.c @@ -103,6 +103,42 @@ static int spapr_vlan_can_receive(NetClientState *nc) return (dev->isopen && dev->rx_bufs > 0); } +/** + * Get buffer descriptor from the receive buffer list page that has been + * supplied by the guest with the H_REGISTER_LOGICAL_LAN call + */ +static vlan_bd_t spapr_vlan_get_rx_bd_from_page(VIOsPAPRVLANDevice *dev, + size_t size) +{ + int buf_ptr = dev->use_buf_ptr; + vlan_bd_t bd; + + do { + buf_ptr += 8; + if (buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) { + buf_ptr = VLAN_RX_BDS_OFF; + } + + bd = vio_ldq(&dev->sdev, dev->buf_list + buf_ptr); + DPRINTF("use_buf_ptr=%d bd=0x%016llx\n", + buf_ptr, (unsigned long long)bd); + } while ((!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8) + && buf_ptr != dev->use_buf_ptr); + + if (!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8) { + /* Failed to find a suitable buffer */ + return 0; + } + + /* Remove the buffer from the pool */ + dev->use_buf_ptr = buf_ptr; + vio_stq(&dev->sdev, dev->buf_list + dev->use_buf_ptr, 0); + + DPRINTF("Found buffer: ptr=%d rxbufs=%d\n", dev->use_buf_ptr, dev->rx_bufs); + + return bd; +} + static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf, size_t size) { @@ -110,7 +146,6 @@ static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf, VIOsPAPRDevice *sdev = VIO_SPAPR_DEVICE(dev); vlan_bd_t rxq_bd = vio_ldq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF); vlan_bd_t bd; - int buf_ptr = dev->use_buf_ptr; uint64_t handle; uint8_t control; @@ -125,29 +160,12 @@ static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf, return -1; } - do { - buf_ptr += 8; - if (buf_ptr >= (VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF)) { - buf_ptr = VLAN_RX_BDS_OFF; - } - - bd = vio_ldq(sdev, dev->buf_list + buf_ptr); - DPRINTF("use_buf_ptr=%d bd=0x%016llx\n", - buf_ptr, (unsigned long long)bd); - } while ((!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8))) - && (buf_ptr != dev->use_buf_ptr)); - - if (!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8))) { - /* Failed to find a suitable buffer */ + bd = spapr_vlan_get_rx_bd_from_page(dev, size); + if (!bd) { return -1; } - /* Remove the buffer from the pool */ dev->rx_bufs--; - dev->use_buf_ptr = buf_ptr; - vio_stq(sdev, dev->buf_list + dev->use_buf_ptr, 0); - - DPRINTF("Found buffer: ptr=%d num=%d\n", dev->use_buf_ptr, dev->rx_bufs); /* Transfer the packet data */ if (spapr_vio_dma_write(sdev, VLAN_BD_ADDR(bd) + 8, buf, size) < 0) { @@ -372,6 +390,32 @@ static target_ulong h_free_logical_lan(PowerPCCPU *cpu, return H_SUCCESS; } +static target_long spapr_vlan_add_rxbuf_to_page(VIOsPAPRVLANDevice *dev, + target_ulong buf) +{ + vlan_bd_t bd; + + if (dev->rx_bufs >= VLAN_MAX_BUFS) { + return H_RESOURCE; + } + + do { + dev->add_buf_ptr += 8; + if (dev->add_buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) { + dev->add_buf_ptr = VLAN_RX_BDS_OFF; + } + + bd = vio_ldq(&dev->sdev, dev->buf_list + dev->add_buf_ptr); + } while (bd & VLAN_BD_VALID); + + vio_stq(&dev->sdev, dev->buf_list + dev->add_buf_ptr, buf); + + DPRINTF("h_add_llan_buf(): Added buf ptr=%d rx_bufs=%d bd=0x%016llx\n", + dev->add_buf_ptr, dev->rx_bufs, (unsigned long long)buf); + + return 0; +} + static target_ulong h_add_logical_lan_buffer(PowerPCCPU *cpu, sPAPRMachineState *spapr, target_ulong opcode, @@ -381,7 +425,7 @@ static target_ulong h_add_logical_lan_buffer(PowerPCCPU *cpu, target_ulong buf = args[1]; VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev); - vlan_bd_t bd; + target_long ret; DPRINTF("H_ADD_LOGICAL_LAN_BUFFER(0x" TARGET_FMT_lx ", 0x" TARGET_FMT_lx ")\n", reg, buf); @@ -397,29 +441,19 @@ static target_ulong h_add_logical_lan_buffer(PowerPCCPU *cpu, return H_PARAMETER; } - if (!dev->isopen || dev->rx_bufs >= VLAN_MAX_BUFS) { + if (!dev->isopen) { return H_RESOURCE; } - do { - dev->add_buf_ptr += 8; - if (dev->add_buf_ptr >= (VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF)) { - dev->add_buf_ptr = VLAN_RX_BDS_OFF; - } - - bd = vio_ldq(sdev, dev->buf_list + dev->add_buf_ptr); - } while (bd & VLAN_BD_VALID); - - vio_stq(sdev, dev->buf_list + dev->add_buf_ptr, buf); + ret = spapr_vlan_add_rxbuf_to_page(dev, buf); + if (ret) { + return ret; + } dev->rx_bufs++; qemu_flush_queued_packets(qemu_get_queue(dev->nic)); - DPRINTF("h_add_logical_lan_buffer(): Added buf ptr=%d rx_bufs=%d" - " bd=0x%016llx\n", dev->add_buf_ptr, dev->rx_bufs, - (unsigned long long)buf); - return H_SUCCESS; }