From patchwork Tue Nov 9 09:03:22 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Xin, Xiaohui" X-Patchwork-Id: 70505 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 C70E5B7121 for ; Tue, 9 Nov 2010 19:43:09 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754504Ab0KIIl6 (ORCPT ); Tue, 9 Nov 2010 03:41:58 -0500 Received: from mga11.intel.com ([192.55.52.93]:40053 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754269Ab0KIIlz (ORCPT ); Tue, 9 Nov 2010 03:41:55 -0500 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 09 Nov 2010 00:41:54 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.59,174,1288594800"; d="scan'208";a="624917815" Received: from unknown (HELO localhost.localdomain.sh.intel.com) ([10.239.36.134]) by fmsmga002.fm.intel.com with ESMTP; 09 Nov 2010 00:41:53 -0800 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: [PATCH v15 17/17] An example how to alloc user buffer based on napi_gro_frags() interface. Date: Tue, 9 Nov 2010 17:03:22 +0800 Message-Id: <1a921f5237c4ce2ed7d739a6d4e28dac11436de2.1289280887.git.xiaohui.xin@intel.com> X-Mailer: git-send-email 1.7.3 In-Reply-To: <1289293402-4791-1-git-send-email-xiaohui.xin@intel.com> References: <1289293402-4791-1-git-send-email-xiaohui.xin@intel.com> In-Reply-To: References: 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(). Signed-off-by: Xin Xiaohui --- drivers/net/ixgbe/ixgbe_main.c | 37 +++++++++++++++++++++++++++++++++---- 1 files changed, 33 insertions(+), 4 deletions(-) diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c index a4a5263..9f5598b 100644 --- a/drivers/net/ixgbe/ixgbe_main.c +++ b/drivers/net/ixgbe/ixgbe_main.c @@ -1032,7 +1032,14 @@ 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; } /** @@ -1105,7 +1112,8 @@ 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 = dma_map_page(&pdev->dev, bi->page_skb, bi->page_skb_offset, (PAGE_SIZE / 2), @@ -1242,8 +1250,10 @@ 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; if (!rx_buffer_info->mapped_as_page) { @@ -1299,6 +1309,11 @@ 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; @@ -1316,7 +1331,8 @@ 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); @@ -6529,6 +6545,16 @@ static void ixgbe_netpoll(struct net_device *netdev) } #endif +#if defined(CONFIG_MEDIATE_PASSTHRU) || defined(CONFIG_MEDIATE_PASSTHRU_MODULE) +static int ixgbe_ndo_mp_port_prep(struct net_device *dev, struct mp_port *port) +{ + port->hdr_len = 128; + port->data_len = 2048; + port->npages = 1; + return 0; +} +#endif + static const struct net_device_ops ixgbe_netdev_ops = { .ndo_open = ixgbe_open, .ndo_stop = ixgbe_close, @@ -6548,6 +6574,9 @@ static const struct net_device_ops ixgbe_netdev_ops = { .ndo_set_vf_vlan = ixgbe_ndo_set_vf_vlan, .ndo_set_vf_tx_rate = ixgbe_ndo_set_vf_bw, .ndo_get_vf_config = ixgbe_ndo_get_vf_config, +#if defined(CONFIG_MEDIATE_PASSTHRU) || defined(CONFIG_MEDIATE_PASSTHRU_MODULE) + .ndo_mp_port_prep = ixgbe_ndo_mp_port_prep, +#endif #ifdef CONFIG_NET_POLL_CONTROLLER .ndo_poll_controller = ixgbe_netpoll, #endif