From: Helin Zhang Date: Mon, 22 Feb 2016 03:59:43 +0000 (+0800) Subject: i40e: enable extended tag X-Git-Tag: spdx-start~7534 X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=56465cfaf;p=dpdk.git i40e: enable extended tag PCIe feature of 'Extended Tag' is important for 40G performance. It adds its enabling during each port initialization, to ensure the high performance. Signed-off-by: Helin Zhang Acked-by: Jingjing Wu --- diff --git a/doc/guides/linux_gsg/enable_func.rst b/doc/guides/linux_gsg/enable_func.rst index c3fa6d35df..8cb3d79301 100644 --- a/doc/guides/linux_gsg/enable_func.rst +++ b/doc/guides/linux_gsg/enable_func.rst @@ -208,6 +208,9 @@ Enabling extended_tag and setting ``max_read_request_size`` to small size such a ``CONFIG_RTE_PCI_MAX_READ_REQUEST_SIZE`` +* From release 16.04, ``extended_tag`` is enabled by default during port + initialization, users don't need to care about that anymore. + Use 16 Bytes RX Descriptor Size ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ diff --git a/doc/guides/rel_notes/release_16_04.rst b/doc/guides/rel_notes/release_16_04.rst index 24f15bf8c7..96f144eb54 100644 --- a/doc/guides/rel_notes/release_16_04.rst +++ b/doc/guides/rel_notes/release_16_04.rst @@ -57,6 +57,12 @@ This section should contain new features added in this release. Sample format: * **Added vhost-user live migration support.** +* **Enabled PCI extended tag for i40e.** + + It enabled extended tag by checking and writing corresponding PCI config + space bytes, to boost the performance. In the meanwhile, it deprecated the + legacy way via reading/writing sysfile supported by kernel module igb_uio. + Resolved Issues --------------- diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c index ef24122081..7e68c61669 100644 --- a/drivers/net/i40e/i40e_ethdev.c +++ b/drivers/net/i40e/i40e_ethdev.c @@ -273,6 +273,17 @@ #define I40E_INSET_IPV6_TC_MASK 0x0009F00FUL #define I40E_INSET_IPV6_NEXT_HDR_MASK 0x000C00FFUL +/* PCI offset for querying capability */ +#define PCI_DEV_CAP_REG 0xA4 +/* PCI offset for enabling/disabling Extended Tag */ +#define PCI_DEV_CTRL_REG 0xA8 +/* Bit mask of Extended Tag capability */ +#define PCI_DEV_CAP_EXT_TAG_MASK 0x20 +/* Bit shift of Extended Tag enable/disable */ +#define PCI_DEV_CTRL_EXT_TAG_SHIFT 8 +/* Bit mask of Extended Tag enable/disable */ +#define PCI_DEV_CTRL_EXT_TAG_MASK (1 << PCI_DEV_CTRL_EXT_TAG_SHIFT) + static int eth_i40e_dev_init(struct rte_eth_dev *eth_dev); static int eth_i40e_dev_uninit(struct rte_eth_dev *eth_dev); static int i40e_dev_configure(struct rte_eth_dev *dev); @@ -386,7 +397,7 @@ static int i40e_dev_filter_ctrl(struct rte_eth_dev *dev, static int i40e_dev_get_dcb_info(struct rte_eth_dev *dev, struct rte_eth_dcb_info *dcb_info); static void i40e_configure_registers(struct i40e_hw *hw); -static void i40e_hw_init(struct i40e_hw *hw); +static void i40e_hw_init(struct rte_eth_dev *dev); static int i40e_config_qinq(struct i40e_hw *hw, struct i40e_vsi *vsi); static int i40e_mirror_rule_set(struct rte_eth_dev *dev, struct rte_eth_mirror_conf *mirror_conf, @@ -765,7 +776,7 @@ eth_i40e_dev_init(struct rte_eth_dev *dev) i40e_clear_hw(hw); /* Initialize the hardware */ - i40e_hw_init(hw); + i40e_hw_init(dev); /* Reset here to make sure all is clean for each PF */ ret = i40e_pf_reset(hw); @@ -7261,14 +7272,62 @@ i40e_dev_filter_ctrl(struct rte_eth_dev *dev, return ret; } +/* + * Check and enable Extended Tag. + * Enabling Extended Tag is important for 40G performance. + */ +static void +i40e_enable_extended_tag(struct rte_eth_dev *dev) +{ + uint32_t buf = 0; + int ret; + + ret = rte_eal_pci_read_config(dev->pci_dev, &buf, sizeof(buf), + PCI_DEV_CAP_REG); + if (ret < 0) { + PMD_DRV_LOG(ERR, "Failed to read PCI offset 0x%x", + PCI_DEV_CAP_REG); + return; + } + if (!(buf & PCI_DEV_CAP_EXT_TAG_MASK)) { + PMD_DRV_LOG(ERR, "Does not support Extended Tag"); + return; + } + + buf = 0; + ret = rte_eal_pci_read_config(dev->pci_dev, &buf, sizeof(buf), + PCI_DEV_CTRL_REG); + if (ret < 0) { + PMD_DRV_LOG(ERR, "Failed to read PCI offset 0x%x", + PCI_DEV_CTRL_REG); + return; + } + if (buf & PCI_DEV_CTRL_EXT_TAG_MASK) { + PMD_DRV_LOG(DEBUG, "Extended Tag has already been enabled"); + return; + } + buf |= PCI_DEV_CTRL_EXT_TAG_MASK; + ret = rte_eal_pci_write_config(dev->pci_dev, &buf, sizeof(buf), + PCI_DEV_CTRL_REG); + if (ret < 0) { + PMD_DRV_LOG(ERR, "Failed to write PCI offset 0x%x", + PCI_DEV_CTRL_REG); + return; + } +} + /* * As some registers wouldn't be reset unless a global hardware reset, * hardware initialization is needed to put those registers into an * expected initial state. */ static void -i40e_hw_init(struct i40e_hw *hw) +i40e_hw_init(struct rte_eth_dev *dev) { + struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private); + + i40e_enable_extended_tag(dev); + /* clear the PF Queue Filter control register */ I40E_WRITE_REG(hw, I40E_PFQF_CTL_0, 0);