From patchwork Thu Jul 29 11:14:48 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Xin, Xiaohui" X-Patchwork-Id: 60207 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id DD843B70A8 for ; Thu, 29 Jul 2010 21:02:42 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757082Ab0G2LCG (ORCPT ); Thu, 29 Jul 2010 07:02:06 -0400 Received: from mga11.intel.com ([192.55.52.93]:14693 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756907Ab0G2LBn (ORCPT ); Thu, 29 Jul 2010 07:01:43 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 29 Jul 2010 03:59:36 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.55,279,1278313200"; d="scan'208";a="590877617" Received: from unknown (HELO localhost.localdomain) ([10.239.36.142]) by fmsmga002.fm.intel.com with ESMTP; 29 Jul 2010 04:00:51 -0700 From: xiaohui.xin@intel.com To: netdev@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mst@redhat.com, mingo@elte.hu, davem@davemloft.net, herbert@gondor.apana.org.au, jdike@linux.intel.com Cc: Xin Xiaohui Subject: [RFC PATCH v8 16/16] An example how to alloc user buffer based on napi_gro_frags() interface. Date: Thu, 29 Jul 2010 19:14:48 +0800 Message-Id: <1280402088-5849-17-git-send-email-xiaohui.xin@intel.com> X-Mailer: git-send-email 1.5.4.4 In-Reply-To: <1280402088-5849-16-git-send-email-xiaohui.xin@intel.com> References: <1280402088-5849-1-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-2-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-3-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-4-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-5-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-6-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-7-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-8-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-9-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-10-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-11-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-12-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-13-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-14-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-15-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-16-git-send-email-xiaohui.xin@intel.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Xin Xiaohui This example is made on ixgbe driver which using napi_gro_frags(). It can get buffers from guest side directly using netdev_alloc_page() and release guest buffers using netdev_free_page(). --- drivers/net/ixgbe/ixgbe_main.c | 19 +++++++++++++++---- 1 files changed, 15 insertions(+), 4 deletions(-) diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c index cfe6853..de5c6d0 100644 --- a/drivers/net/ixgbe/ixgbe_main.c +++ b/drivers/net/ixgbe/ixgbe_main.c @@ -691,7 +691,14 @@ static inline void ixgbe_release_rx_desc(struct ixgbe_hw *hw, static bool is_rx_buffer_mapped_as_page(struct ixgbe_rx_buffer *bi, struct net_device *dev) { - return true; + return dev_is_mpassthru(dev); +} + +static u32 get_page_skb_offset(struct net_device *dev) +{ + if (!dev_is_mpassthru(dev)) + return 0; + return dev->mp_port->vnet_hlen; } /** @@ -764,7 +771,8 @@ static void ixgbe_alloc_rx_buffers(struct ixgbe_adapter *adapter, adapter->alloc_rx_page_failed++; goto no_buffers; } - bi->page_skb_offset = 0; + bi->page_skb_offset = + get_page_skb_offset(adapter->netdev); bi->dma = pci_map_page(pdev, bi->page_skb, bi->page_skb_offset, (PAGE_SIZE / 2), @@ -899,8 +907,10 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector, len = le16_to_cpu(rx_desc->wb.upper.length); } - if (is_no_buffer(rx_buffer_info)) + if (is_no_buffer(rx_buffer_info)) { + printk("no buffers\n"); break; + } cleaned = true; @@ -962,7 +972,8 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector, upper_len); if ((rx_ring->rx_buf_len > (PAGE_SIZE / 2)) || - (page_count(rx_buffer_info->page) != 1)) + (page_count(rx_buffer_info->page) != 1) || + dev_is_mpassthru(netdev)) rx_buffer_info->page = NULL; else get_page(rx_buffer_info->page);