Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935320Ab0HFJJd (ORCPT ); Fri, 6 Aug 2010 05:09:33 -0400 Received: from mga11.intel.com ([192.55.52.93]:9539 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935231Ab0HFJJ1 (ORCPT ); Fri, 6 Aug 2010 05:09:27 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.55,327,1278313200"; d="scan'208";a="593547922" 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.hengli.com.au, jdike@linux.intel.com Cc: Xin Xiaohui Subject: [RFC PATCH v9 16/16] An example how to alloc user buffer based on napi_gro_frags() interface. Date: Fri, 6 Aug 2010 17:23:44 +0800 Message-Id: <1281086624-5765-17-git-send-email-xiaohui.xin@intel.com> X-Mailer: git-send-email 1.5.4.4 In-Reply-To: <1281086624-5765-16-git-send-email-xiaohui.xin@intel.com> References: <1281086624-5765-1-git-send-email-xiaohui.xin@intel.com> <1281086624-5765-2-git-send-email-xiaohui.xin@intel.com> <1281086624-5765-3-git-send-email-xiaohui.xin@intel.com> <1281086624-5765-4-git-send-email-xiaohui.xin@intel.com> <1281086624-5765-5-git-send-email-xiaohui.xin@intel.com> <1281086624-5765-6-git-send-email-xiaohui.xin@intel.com> <1281086624-5765-7-git-send-email-xiaohui.xin@intel.com> <1281086624-5765-8-git-send-email-xiaohui.xin@intel.com> <1281086624-5765-9-git-send-email-xiaohui.xin@intel.com> <1281086624-5765-10-git-send-email-xiaohui.xin@intel.com> <1281086624-5765-11-git-send-email-xiaohui.xin@intel.com> <1281086624-5765-12-git-send-email-xiaohui.xin@intel.com> <1281086624-5765-13-git-send-email-xiaohui.xin@intel.com> <1281086624-5765-14-git-send-email-xiaohui.xin@intel.com> <1281086624-5765-15-git-send-email-xiaohui.xin@intel.com> <1281086624-5765-16-git-send-email-xiaohui.xin@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2625 Lines: 82 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 | 25 +++++++++++++++++++++---- 1 files changed, 21 insertions(+), 4 deletions(-) diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c index cfe6853..c563111 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; @@ -945,6 +955,12 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector, rx_buffer_info->page_skb, rx_buffer_info->page_skb_offset, len); + if (dev_is_mpassthru(netdev) && + netdev->mp_port->hash) + skb_shinfo(skb)->destructor_arg = + netdev->mp_port->hash(netdev, + rx_buffer_info->page_skb); + rx_buffer_info->page_skb = NULL; skb->len += len; skb->data_len += len; @@ -962,7 +978,8 @@ 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); -- 1.5.4.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/