Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754451Ab0LAHq6 (ORCPT ); Wed, 1 Dec 2010 02:46:58 -0500 Received: from mga02.intel.com ([134.134.136.20]:52058 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754223Ab0LAHqz (ORCPT ); Wed, 1 Dec 2010 02:46:55 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.59,282,1288594800"; d="scan'208";a="682672480" 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: [PATCH v16 17/17]An example how to alloc user buffer based on napi_gro_frags() interface. Date: Wed, 1 Dec 2010 16:08:28 +0800 Message-Id: <2936ba1da217272d2a8ba1f957b3e10ff167e77d.1291187695.git.xiaohui.xin@intel.com> X-Mailer: git-send-email 1.7.3 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3636 Lines: 110 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 cd69080..807a51e 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) { @@ -1305,6 +1315,11 @@ 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; @@ -1322,7 +1337,8 @@ 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); @@ -6535,6 +6551,16 @@ 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, @@ -6554,6 +6580,9 @@ 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 -- 1.7.3 -- 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/