RE: [Intel-wired-lan] [PATCH net-next V2 2/2] intel: ixgbevf: Support Windows hosts (Hyper-V)

From: KY Srinivasan
Date: Mon Apr 18 2016 - 12:53:13 EST

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> -----Original Message-----
> From: Alexander Duyck [mailto:alexander.duyck@xxxxxxxxx]
> Sent: Monday, April 18, 2016 9:18 AM
> To: KY Srinivasan <kys@xxxxxxxxxxxxx>
> Cc: David Miller <davem@xxxxxxxxxxxxx>; Netdev
> <netdev@xxxxxxxxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx;
> devel@xxxxxxxxxxxxxxxxxxxxxx; olaf@xxxxxxxxx; Robo Bot
> <apw@xxxxxxxxxxxxx>; Jason Wang <jasowang@xxxxxxxxxx>;
> eli@xxxxxxxxxxxx; jackm@xxxxxxxxxxxx; yevgenyp@xxxxxxxxxxxx; John
> Ronciak <john.ronciak@xxxxxxxxx>; intel-wired-lan <intel-wired-
> lan@xxxxxxxxxxxxxxxx>
> Subject: Re: [Intel-wired-lan] [PATCH net-next V2 2/2] intel: ixgbevf: Support
> Windows hosts (Hyper-V)
>
> On Sun, Apr 17, 2016 at 10:22 PM, K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
> wrote:
> > 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>.
> >
> > drivers/net/ethernet/intel/ixgbevf/ixgbevf.h | 12 ++
> > drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 16 ++-
> > drivers/net/ethernet/intel/ixgbevf/mbx.c | 12 ++
> > drivers/net/ethernet/intel/ixgbevf/vf.c | 201
> +++++++++++++++++++++
> > 4 files changed, 237 insertions(+), 4 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..c761d80 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, }
> > };
> > 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..1ec13c1 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 +133,23 @@ 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;
> > +
> > + for (i = 0; i < 6; i++)
> > + pci_read_config_byte(adapter->pdev,
> > + (i + IXGBE_HV_RESET_OFFSET),
> > + &hw->mac.perm_addr[i]);
> > +
> > + return 0;
> > +}
> > +
>
> I'm still not seeing anything that protects the HyperV VF from being
> built with MM_CONFIG disabled. As such this driver will just fail
> with no explanation in such a case. If nothing else you could add
> some code here that printed an error message if MM_CONFIG is disabled
> at the very least.
I will add the error message.

>
> > +/**
> > * ixgbevf_stop_hw_vf - Generic stop Tx/Rx units
> > * @hw: pointer to hardware structure
> > *
> > @@ -258,6 +282,11 @@ 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 +445,26 @@ 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 +522,15 @@ 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 +571,15 @@ 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 +618,15 @@ 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 +732,67 @@ 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
> > @@ -663,6 +800,18 @@ out:
> > void ixgbevf_rlpml_set_vf(struct ixgbe_hw *hw, u16 max_size)
> > {
> > u32 msgbuf[2];
> > + u32 reg;
> > +
> > + if (ixgbevf_on_hyperv(hw)) {
> > + /* 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);
> > + return;
> > + }
> >
> > msgbuf[0] = IXGBE_VF_SET_LPE;
> > msgbuf[1] = max_size;
>
> There is no point in making this one function. You should split this
> code out and create a HyperV version of the function that you can call
> instead. It would help to make this more readable anyway since you
> can then drop one level of indentation.

I will split the function as you have suggested.

>
> > @@ -679,6 +828,15 @@ int ixgbevf_negotiate_api_version(struct
> ixgbe_hw *hw, int api)
> > int err;
> > u32 msg[3];
> >
> > + if (ixgbevf_on_hyperv(hw)) {
> > + /* Hyper-V only supports api version ixgbe_mbox_api_10
> > + */
> > + if (api != ixgbe_mbox_api_10)
> > + return IXGBE_ERR_INVALID_ARGUMENT;
> > +
> > + return 0;
> > + }
> > +
> > /* Negotiate the mailbox API version */
> > msg[0] = IXGBE_VF_API_NEGOTIATE;
> > msg[1] = api;
>
> Same thing here. You can just create a new function and avoid having
> to mess with the mailbox based approach.

I will split the function as you have suggested.
>
> > @@ -776,22 +934,65 @@ 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)
> > +{
> > + if (hw->mbx.ops.check_for_msg == NULL)
> > + return true;
> > + else
> > + return false;
> > +}
> > --
> > 1.7.4.1

Thank you.

K. Y
> >
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