[PATCH net-next V3 2/2] intel: ixgbevf: Support Windows hosts (Hyper-V)

From: K. Y. Srinivasan
Date: Tue Apr 19 2016 - 10:11:04 EST

On Hyper-V, the VF/PF communication is a via software mediated path
as opposed to the hardware mailbox. Make the necessary
adjustments to support Hyper-V.

Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
V2: Addressed most of the comments from
Alexander Duyck <alexander.duyck@xxxxxxxxx>
and Rustad, Mark D <mark.d.rustad@xxxxxxxxx>.

V3: Addressed additional comments from
Alexander Duyck <alexander.duyck@xxxxxxxxx>

---
drivers/net/ethernet/intel/ixgbevf/ixgbevf.h | 12 ++
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 31 +++-
drivers/net/ethernet/intel/ixgbevf/mbx.c | 12 ++
drivers/net/ethernet/intel/ixgbevf/vf.c | 216 +++++++++++++++++++++
drivers/net/ethernet/intel/ixgbevf/vf.h | 2 +
5 files changed, 266 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h b/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
index 5ac60ee..3296d27 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
@@ -460,9 +460,13 @@ enum ixbgevf_state_t {

enum ixgbevf_boards {
board_82599_vf,
+ board_82599_vf_hv,
board_X540_vf,
+ board_X540_vf_hv,
board_X550_vf,
+ board_X550_vf_hv,
board_X550EM_x_vf,
+ board_X550EM_x_vf_hv,
};

enum ixgbevf_xcast_modes {
@@ -477,6 +481,13 @@ extern const struct ixgbevf_info ixgbevf_X550_vf_info;
extern const struct ixgbevf_info ixgbevf_X550EM_x_vf_info;
extern const struct ixgbe_mbx_operations ixgbevf_mbx_ops;

+
+extern const struct ixgbevf_info ixgbevf_82599_vf_hv_info;
+extern const struct ixgbevf_info ixgbevf_X540_vf_hv_info;
+extern const struct ixgbevf_info ixgbevf_X550_vf_hv_info;
+extern const struct ixgbevf_info ixgbevf_X550EM_x_vf_hv_info;
+extern const struct ixgbe_mbx_operations ixgbevf_hv_mbx_ops;
+
/* needed by ethtool.c */
extern const char ixgbevf_driver_name[];
extern const char ixgbevf_driver_version[];
@@ -494,6 +505,7 @@ void ixgbevf_free_rx_resources(struct ixgbevf_ring *);
void ixgbevf_free_tx_resources(struct ixgbevf_ring *);
void ixgbevf_update_stats(struct ixgbevf_adapter *adapter);
int ethtool_ioctl(struct ifreq *ifr);
+bool ixgbevf_on_hyperv(struct ixgbe_hw *hw);

extern void ixgbevf_write_eitr(struct ixgbevf_q_vector *q_vector);

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 007cbe0..c4bb480 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -62,10 +62,14 @@ static char ixgbevf_copyright[] =
"Copyright (c) 2009 - 2015 Intel Corporation.";

static const struct ixgbevf_info *ixgbevf_info_tbl[] = {
- [board_82599_vf] = &ixgbevf_82599_vf_info,
- [board_X540_vf] = &ixgbevf_X540_vf_info,
- [board_X550_vf] = &ixgbevf_X550_vf_info,
- [board_X550EM_x_vf] = &ixgbevf_X550EM_x_vf_info,
+ [board_82599_vf] = &ixgbevf_82599_vf_info,
+ [board_82599_vf_hv] = &ixgbevf_82599_vf_hv_info,
+ [board_X540_vf] = &ixgbevf_X540_vf_info,
+ [board_X540_vf_hv] = &ixgbevf_X540_vf_hv_info,
+ [board_X550_vf] = &ixgbevf_X550_vf_info,
+ [board_X550_vf_hv] = &ixgbevf_X550_vf_hv_info,
+ [board_X550EM_x_vf] = &ixgbevf_X550EM_x_vf_info,
+ [board_X550EM_x_vf_hv] = &ixgbevf_X550EM_x_vf_hv_info,
};

/* ixgbevf_pci_tbl - PCI Device ID Table
@@ -78,9 +82,13 @@ static const struct ixgbevf_info *ixgbevf_info_tbl[] = {
*/
static const struct pci_device_id ixgbevf_pci_tbl[] = {
{PCI_VDEVICE(INTEL, IXGBE_DEV_ID_82599_VF), board_82599_vf },
+ {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_82599_VF_HV), board_82599_vf_hv },
{PCI_VDEVICE(INTEL, IXGBE_DEV_ID_X540_VF), board_X540_vf },
+ {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_X540_VF_HV), board_X540_vf_hv },
{PCI_VDEVICE(INTEL, IXGBE_DEV_ID_X550_VF), board_X550_vf },
+ {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_X550_VF_HV), board_X550_vf_hv },
{PCI_VDEVICE(INTEL, IXGBE_DEV_ID_X550EM_X_VF), board_X550EM_x_vf },
+ {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_X550EM_X_VF_HV), board_X550EM_x_vf_hv},
/* required last entry */
{0, }
};
@@ -1795,7 +1803,10 @@ static void ixgbevf_configure_rx(struct ixgbevf_adapter *adapter)
ixgbevf_setup_vfmrqc(adapter);

/* notify the PF of our intent to use this size of frame */
- ixgbevf_rlpml_set_vf(hw, netdev->mtu + ETH_HLEN + ETH_FCS_LEN);
+ if (!ixgbevf_on_hyperv(hw))
+ ixgbevf_rlpml_set_vf(hw, netdev->mtu + ETH_HLEN + ETH_FCS_LEN);
+ else
+ ixgbevf_hv_rlpml_set_vf(hw, netdev->mtu + ETH_HLEN + ETH_FCS_LEN);

/* Setup the HW Rx Head and Tail Descriptor Pointers and
* the Base and Length of the Rx Descriptor Ring
@@ -2056,7 +2067,10 @@ static void ixgbevf_negotiate_api(struct ixgbevf_adapter *adapter)
spin_lock_bh(&adapter->mbx_lock);

while (api[idx] != ixgbe_mbox_api_unknown) {
- err = ixgbevf_negotiate_api_version(hw, api[idx]);
+ if (!ixgbevf_on_hyperv(hw))
+ err = ixgbevf_negotiate_api_version(hw, api[idx]);
+ else
+ err = ixgbevf_hv_negotiate_api_version(hw, api[idx]);
if (!err)
break;
idx++;
@@ -3727,7 +3741,10 @@ static int ixgbevf_change_mtu(struct net_device *netdev, int new_mtu)
netdev->mtu = new_mtu;

/* notify the PF of our intent to use this size of frame */
- ixgbevf_rlpml_set_vf(hw, max_frame);
+ if (!ixgbevf_on_hyperv(hw))
+ ixgbevf_rlpml_set_vf(hw, max_frame);
+ else
+ ixgbevf_hv_rlpml_set_vf(hw, max_frame);

return 0;
}
diff --git a/drivers/net/ethernet/intel/ixgbevf/mbx.c b/drivers/net/ethernet/intel/ixgbevf/mbx.c
index dc68fea..298a0da 100644
--- a/drivers/net/ethernet/intel/ixgbevf/mbx.c
+++ b/drivers/net/ethernet/intel/ixgbevf/mbx.c
@@ -346,3 +346,15 @@ const struct ixgbe_mbx_operations ixgbevf_mbx_ops = {
.check_for_rst = ixgbevf_check_for_rst_vf,
};

+/**
+ * Mailbox operations when running on Hyper-V.
+ * On Hyper-V, PF/VF communiction is not through the
+ * hardware mailbox; this communication is through
+ * a software mediated path.
+ * Most mail box operations are noop while running on
+ * Hyper-V.
+ */
+const struct ixgbe_mbx_operations ixgbevf_hv_mbx_ops = {
+ .init_params = ixgbevf_init_mbx_params_vf,
+ .check_for_rst = ixgbevf_check_for_rst_vf,
+};
diff --git a/drivers/net/ethernet/intel/ixgbevf/vf.c b/drivers/net/ethernet/intel/ixgbevf/vf.c
index 4d613a4..c794e0f 100644
--- a/drivers/net/ethernet/intel/ixgbevf/vf.c
+++ b/drivers/net/ethernet/intel/ixgbevf/vf.c
@@ -27,6 +27,13 @@
#include "vf.h"
#include "ixgbevf.h"

+/*
+ * On Hyper-V, to reset, we need to read from this offset
+ * from the PCI config space. This is the mechanism used on
+ * Hyper-V to support PF/VF communication.
+ */
+#define IXGBE_HV_RESET_OFFSET 0x201
+
/**
* ixgbevf_start_hw_vf - Prepare hardware for Tx/Rx
* @hw: pointer to hardware structure
@@ -126,6 +133,27 @@ static s32 ixgbevf_reset_hw_vf(struct ixgbe_hw *hw)
}

/**
+ * Hyper-V variant; the VF/PF communication is through the PCI
+ * config space.
+ */
+static s32 ixgbevf_hv_reset_hw_vf(struct ixgbe_hw *hw)
+{
+ struct ixgbevf_adapter *adapter = hw->back;
+ int i;
+
+#if IS_ENABLED(CONFIG_PCI_MMCONFIG)
+ for (i = 0; i < 6; i++)
+ pci_read_config_byte(adapter->pdev,
+ (i + IXGBE_HV_RESET_OFFSET),
+ &hw->mac.perm_addr[i]);
+#else
+ pr_err("PCI_MMCONFIG needs to be enabled for Hyper-V\n");
+#endif
+
+ return 0;
+}
+
+/**
* ixgbevf_stop_hw_vf - Generic stop Tx/Rx units
* @hw: pointer to hardware structure
*
@@ -258,6 +286,11 @@ static s32 ixgbevf_set_uc_addr_vf(struct ixgbe_hw *hw, u32 index, u8 *addr)
return ret_val;
}

+static s32 ixgbevf_hv_set_uc_addr_vf(struct ixgbe_hw *hw, u32 index, u8 *addr)
+{
+ return -EOPNOTSUPP;
+}
+
/**
* ixgbevf_get_reta_locked - get the RSS redirection table (RETA) contents.
* @adapter: pointer to the port handle
@@ -416,6 +449,26 @@ static s32 ixgbevf_set_rar_vf(struct ixgbe_hw *hw, u32 index, u8 *addr,
return ret_val;
}

+/**
+ * ixgbevf_hv_set_rar_vf - set device MAC address Hyper-V variant
+ * @hw: pointer to hardware structure
+ * @index: Receive address register to write
+ * @addr: Address to put into receive address register
+ * @vmdq: Unused in this implementation
+ *
+ * We don't really allow setting the device MAC address. However,
+ * if the address being set is the permanent MAC address we will
+ * permit that.
+ **/
+static s32 ixgbevf_hv_set_rar_vf(struct ixgbe_hw *hw, u32 index, u8 *addr,
+ u32 vmdq)
+{
+ if (ether_addr_equal(addr, hw->mac.perm_addr))
+ return 0;
+
+ return -EOPNOTSUPP;
+}
+
static void ixgbevf_write_msg_read_ack(struct ixgbe_hw *hw,
u32 *msg, u16 size)
{
@@ -473,6 +526,15 @@ static s32 ixgbevf_update_mc_addr_list_vf(struct ixgbe_hw *hw,
}

/**
+ * Hyper-V variant - just a stub.
+ */
+static s32 ixgbevf_hv_update_mc_addr_list_vf(struct ixgbe_hw *hw,
+ struct net_device *netdev)
+{
+ return -EOPNOTSUPP;
+}
+
+/**
* ixgbevf_update_xcast_mode - Update Multicast mode
* @hw: pointer to the HW structure
* @netdev: pointer to net device structure
@@ -513,6 +575,15 @@ static s32 ixgbevf_update_xcast_mode(struct ixgbe_hw *hw,
}

/**
+ * Hyper-V variant - just a stub.
+ */
+static s32 ixgbevf_hv_update_xcast_mode(struct ixgbe_hw *hw,
+ struct net_device *netdev, int xcast_mode)
+{
+ return -EOPNOTSUPP;
+}
+
+/**
* ixgbevf_set_vfta_vf - Set/Unset VLAN filter table address
* @hw: pointer to the HW structure
* @vlan: 12 bit VLAN ID
@@ -551,6 +622,15 @@ mbx_err:
}

/**
+ * Hyper-V variant - just a stub.
+ */
+static s32 ixgbevf_hv_set_vfta_vf(struct ixgbe_hw *hw, u32 vlan, u32 vind,
+ bool vlan_on)
+{
+ return -EOPNOTSUPP;
+}
+
+/**
* ixgbevf_setup_mac_link_vf - Setup MAC link settings
* @hw: pointer to hardware structure
* @speed: Unused in this implementation
@@ -656,6 +736,67 @@ out:
}

/**
+ * Hyper-V variant; there is no mailbox communication.
+ */
+static s32 ixgbevf_hv_check_mac_link_vf(struct ixgbe_hw *hw,
+ ixgbe_link_speed *speed,
+ bool *link_up,
+ bool autoneg_wait_to_complete)
+{
+ struct ixgbe_mbx_info *mbx = &hw->mbx;
+ struct ixgbe_mac_info *mac = &hw->mac;
+ u32 links_reg;
+
+ /* If we were hit with a reset drop the link */
+ if (!mbx->ops.check_for_rst(hw) || !mbx->timeout)
+ mac->get_link_status = true;
+
+ if (!mac->get_link_status)
+ goto out;
+
+ /* if link status is down no point in checking to see if pf is up */
+ links_reg = IXGBE_READ_REG(hw, IXGBE_VFLINKS);
+ if (!(links_reg & IXGBE_LINKS_UP))
+ goto out;
+
+ /* for SFP+ modules and DA cables on 82599 it can take up to 500usecs
+ * before the link status is correct
+ */
+ if (mac->type == ixgbe_mac_82599_vf) {
+ int i;
+
+ for (i = 0; i < 5; i++) {
+ udelay(100);
+ links_reg = IXGBE_READ_REG(hw, IXGBE_VFLINKS);
+
+ if (!(links_reg & IXGBE_LINKS_UP))
+ goto out;
+ }
+ }
+
+ switch (links_reg & IXGBE_LINKS_SPEED_82599) {
+ case IXGBE_LINKS_SPEED_10G_82599:
+ *speed = IXGBE_LINK_SPEED_10GB_FULL;
+ break;
+ case IXGBE_LINKS_SPEED_1G_82599:
+ *speed = IXGBE_LINK_SPEED_1GB_FULL;
+ break;
+ case IXGBE_LINKS_SPEED_100_82599:
+ *speed = IXGBE_LINK_SPEED_100_FULL;
+ break;
+ }
+
+ /* if we passed all the tests above then the link is up and we no
+ * longer need to check for link
+ */
+ mac->get_link_status = false;
+
+out:
+ *link_up = !mac->get_link_status;
+ return 0;
+}
+
+/**
* ixgbevf_rlpml_set_vf - Set the maximum receive packet length
* @hw: pointer to the HW structure
* @max_size: value to assign to max frame size
@@ -670,6 +811,25 @@ void ixgbevf_rlpml_set_vf(struct ixgbe_hw *hw, u16 max_size)
}

/**
+ * ixgbevf_hv_rlpml_set_vf - Set the maximum receive packet length
+ * @hw: pointer to the HW structure
+ * @max_size: value to assign to max frame size
+ * Hyper-V variant.
+ **/
+void ixgbevf_hv_rlpml_set_vf(struct ixgbe_hw *hw, u16 max_size)
+{
+ u32 reg;
+
+ /* If we are on Hyper-V, we implement
+ * this functionality differently.
+ */
+ reg = IXGBE_READ_REG(hw, IXGBE_VFRXDCTL(0));
+ /* CRC == 4 */
+ reg |= ((max_size + 4) | IXGBE_RXDCTL_RLPML_EN);
+ IXGBE_WRITE_REG(hw, IXGBE_VFRXDCTL(0), reg);
+}
+
+/**
* ixgbevf_negotiate_api_version - Negotiate supported API version
* @hw: pointer to the HW structure
* @api: integer containing requested API version
@@ -703,6 +863,22 @@ int ixgbevf_negotiate_api_version(struct ixgbe_hw *hw, int api)
return err;
}

+/**
+ * ixgbevf_hv_negotiate_api_version - Negotiate supported API version
+ * @hw: pointer to the HW structure
+ * @api: integer containing requested API version
+ * Hyper-V version - only ixgbe_mbox_api_10 supported.
+ **/
+int ixgbevf_hv_negotiate_api_version(struct ixgbe_hw *hw, int api)
+{
+ /* Hyper-V only supports api version ixgbe_mbox_api_10
+ */
+ if (api != ixgbe_mbox_api_10)
+ return IXGBE_ERR_INVALID_ARGUMENT;
+
+ return 0;
+}
+
int ixgbevf_get_queues(struct ixgbe_hw *hw, unsigned int *num_tcs,
unsigned int *default_tc)
{
@@ -776,22 +952,62 @@ static const struct ixgbe_mac_operations ixgbevf_mac_ops = {
.set_vfta = ixgbevf_set_vfta_vf,
};

+static const struct ixgbe_mac_operations ixgbevf_hv_mac_ops = {
+ .init_hw = ixgbevf_init_hw_vf,
+ .reset_hw = ixgbevf_hv_reset_hw_vf,
+ .start_hw = ixgbevf_start_hw_vf,
+ .get_mac_addr = ixgbevf_get_mac_addr_vf,
+ .stop_adapter = ixgbevf_stop_hw_vf,
+ .setup_link = ixgbevf_setup_mac_link_vf,
+ .check_link = ixgbevf_hv_check_mac_link_vf,
+ .set_rar = ixgbevf_hv_set_rar_vf,
+ .update_mc_addr_list = ixgbevf_hv_update_mc_addr_list_vf,
+ .update_xcast_mode = ixgbevf_hv_update_xcast_mode,
+ .set_uc_addr = ixgbevf_hv_set_uc_addr_vf,
+ .set_vfta = ixgbevf_hv_set_vfta_vf,
+};
+
const struct ixgbevf_info ixgbevf_82599_vf_info = {
.mac = ixgbe_mac_82599_vf,
.mac_ops = &ixgbevf_mac_ops,
};

+const struct ixgbevf_info ixgbevf_82599_vf_hv_info = {
+ .mac = ixgbe_mac_82599_vf,
+ .mac_ops = &ixgbevf_hv_mac_ops,
+};
+
const struct ixgbevf_info ixgbevf_X540_vf_info = {
.mac = ixgbe_mac_X540_vf,
.mac_ops = &ixgbevf_mac_ops,
};

+const struct ixgbevf_info ixgbevf_X540_vf_hv_info = {
+ .mac = ixgbe_mac_X540_vf,
+ .mac_ops = &ixgbevf_hv_mac_ops,
+};
+
const struct ixgbevf_info ixgbevf_X550_vf_info = {
.mac = ixgbe_mac_X550_vf,
.mac_ops = &ixgbevf_mac_ops,
};

+const struct ixgbevf_info ixgbevf_X550_vf_hv_info = {
+ .mac = ixgbe_mac_X550_vf,
+ .mac_ops = &ixgbevf_hv_mac_ops,
+};
+
const struct ixgbevf_info ixgbevf_X550EM_x_vf_info = {
.mac = ixgbe_mac_X550EM_x_vf,
.mac_ops = &ixgbevf_mac_ops,
};
+
+const struct ixgbevf_info ixgbevf_X550EM_x_vf_hv_info = {
+ .mac = ixgbe_mac_X550EM_x_vf,
+ .mac_ops = &ixgbevf_hv_mac_ops,
+};
+
+bool ixgbevf_on_hyperv(struct ixgbe_hw *hw)
+{
+ return hw->mbx.ops.check_for_msg == NULL;
+}
diff --git a/drivers/net/ethernet/intel/ixgbevf/vf.h b/drivers/net/ethernet/intel/ixgbevf/vf.h
index ef9f773..658883e 100644
--- a/drivers/net/ethernet/intel/ixgbevf/vf.h
+++ b/drivers/net/ethernet/intel/ixgbevf/vf.h
@@ -208,7 +208,9 @@ static inline u32 ixgbe_read_reg_array(struct ixgbe_hw *hw, u32 reg,
#define IXGBE_READ_REG_ARRAY(h, r, o) ixgbe_read_reg_array(h, r, o)

void ixgbevf_rlpml_set_vf(struct ixgbe_hw *hw, u16 max_size);
+void ixgbevf_hv_rlpml_set_vf(struct ixgbe_hw *hw, u16 max_size);
int ixgbevf_negotiate_api_version(struct ixgbe_hw *hw, int api);
+int ixgbevf_hv_negotiate_api_version(struct ixgbe_hw *hw, int api);
int ixgbevf_get_queues(struct ixgbe_hw *hw, unsigned int *num_tcs,
unsigned int *default_tc);
int ixgbevf_get_reta_locked(struct ixgbe_hw *hw, u32 *reta, int num_rx_queues);
--
1.7.4.1