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Date: Wed, 14 Jun 2023 10:02:16 +0000
From: "Ma, Hao" <hao.ma@...el.com>
To: "Fijalkowski, Maciej" <maciej.fijalkowski@...el.com>, Magnus Karlsson
<magnus.karlsson@...il.com>
CC: "Karlsson, Magnus" <magnus.karlsson@...el.com>,
"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
"Nguyen, Anthony L" <anthony.l.nguyen@...el.com>, "netdev@...r.kernel.org"
<netdev@...r.kernel.org>
Subject: RE: [PATCH iwl-next] ixgbe: allow toggling loopback mode via
ndo_set_features callback
> -----Original Message-----
> From: Fijalkowski, Maciej <maciej.fijalkowski@...el.com>
> Sent: Thursday, June 1, 2023 5:54 PM
> To: Magnus Karlsson <magnus.karlsson@...il.com>
> Cc: Karlsson, Magnus <magnus.karlsson@...el.com>; intel-wired-lan@...ts.osuosl.org; Nguyen, Anthony L <anthony.l.nguyen@...el.com>;
> Ma, Hao <hao.ma@...el.com>; netdev@...r.kernel.org
> Subject: Re: [PATCH iwl-next] ixgbe: allow toggling loopback mode via ndo_set_features callback
>
> On Thu, Jun 01, 2023 at 09:46:21AM +0200, Magnus Karlsson wrote:
> > From: Hao Ma <hao.ma@...el.com>
> >
> > Add support for NETIF_F_LOOPBACK. This feature can be set via: $
> > ethtool -K eth0 loopback <on|off>. This sets the MAC Tx->Rx loopback
> > used by selftests/bpf/xskxceiver.
> >
> > Signed-off-by: Hao Ma <hao.ma@...el.com>
> > ---
> > .../net/ethernet/intel/ixgbe/ixgbe_common.c | 4 +-
> > drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 73
> > +++++++++++++++++++ drivers/net/ethernet/intel/ixgbe/ixgbe_type.h |
> > 1 +
> > 3 files changed, 76 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
> > b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
> > index 878dd8dff528..b8998a56ad24 100644
> > --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
> > +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
> > @@ -3337,7 +3337,7 @@ s32 ixgbe_check_mac_link_generic(struct ixgbe_hw
> > *hw, ixgbe_link_speed *speed,
> >
> > if (link_up_wait_to_complete) {
> > for (i = 0; i < IXGBE_LINK_UP_TIME; i++) {
> > - if (links_reg & IXGBE_LINKS_UP) {
> > + if (links_reg & IXGBE_LINKS_UP || hw->loopback_on) {
> > *link_up = true;
> > break;
> > } else {
> > @@ -3347,7 +3347,7 @@ s32 ixgbe_check_mac_link_generic(struct ixgbe_hw *hw, ixgbe_link_speed *speed,
> > links_reg = IXGBE_READ_REG(hw, IXGBE_LINKS);
> > }
> > } else {
> > - if (links_reg & IXGBE_LINKS_UP) {
> > + if (links_reg & IXGBE_LINKS_UP || hw->loopback_on) {
> > if (crosstalk_fix_active) {
> > /* Check the link state again after a delay
> > * to filter out spurious link up diff --git
> > a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> > b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> > index 5d83c887a3fc..70b34b7b5cb0 100644
> > --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> > +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> > @@ -8864,6 +8864,57 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
> > return NETDEV_TX_OK;
> > }
> >
> > +static int ixgbe_force_loopback(struct ixgbe_adapter *adapter, bool on)
> > +{ struct ixgbe_hw *hw = &adapter->hw;
> > + u32 reg_data;
> > +
> > + hw->loopback_on = on;
> > + /* Setup MAC loopback */
> > + reg_data = IXGBE_READ_REG(hw, IXGBE_HLREG0);
> > + if (on)
> > + reg_data |= IXGBE_HLREG0_LPBK;
> > + else
> > + reg_data &= ~IXGBE_HLREG0_LPBK;
> > + IXGBE_WRITE_REG(hw, IXGBE_HLREG0, reg_data);
> > +
> > + reg_data = IXGBE_READ_REG(hw, IXGBE_FCTRL);
> > + if (on)
> > + reg_data |= IXGBE_FCTRL_SBP | IXGBE_FCTRL_MPE;
> > + else
> > + reg_data &= ~(IXGBE_FCTRL_SBP | IXGBE_FCTRL_MPE);
> > + reg_data &= ~(IXGBE_FCTRL_BAM);
> > + IXGBE_WRITE_REG(hw, IXGBE_FCTRL, reg_data);
> > +
> > + /* X540 and X550 needs to set the MACC.FLU bit to force link up */
> > + switch (adapter->hw.mac.type) {
> > + case ixgbe_mac_X540:
> > + case ixgbe_mac_X550:
> > + case ixgbe_mac_X550EM_x:
> > + case ixgbe_mac_x550em_a:
> > + reg_data = IXGBE_READ_REG(hw, IXGBE_MACC);
> > + if (on)
> > + reg_data |= IXGBE_MACC_FLU;
> > + else
> > + reg_data &= ~IXGBE_MACC_FLU;
> > + IXGBE_WRITE_REG(hw, IXGBE_MACC, reg_data);
> > + break;
> > + default:
> > + if (hw->mac.orig_autoc) {
> > + if (on)
> > + reg_data = hw->mac.orig_autoc | IXGBE_AUTOC_FLU;
> > + else
> > + reg_data = hw->mac.orig_autoc & ~IXGBE_AUTOC_FLU;
> > + IXGBE_WRITE_REG(hw, IXGBE_AUTOC, reg_data);
> > + } else {
> > + return 10;
> > + }
> > + }
> > +
> > + IXGBE_WRITE_FLUSH(hw);
> > +
> > + return 0;
> > +}
> > +
> > static netdev_tx_t __ixgbe_xmit_frame(struct sk_buff *skb,
> > struct net_device *netdev,
> > struct ixgbe_ring *ring)
> > @@ -9915,6 +9966,15 @@ static int ixgbe_set_features(struct net_device *netdev,
> > if (changed & NETIF_F_RXALL)
> > need_reset = true;
> >
> > + if (changed & NETIF_F_LOOPBACK) {
> > + if (features & NETIF_F_LOOPBACK) {
> > + ixgbe_force_loopback(adapter, true);
> > + } else {
> > + ixgbe_force_loopback(adapter, false);
> > + need_reset = true;
> > + }
>
> on ice we just do:
>
> if (changed & NETIF_F_LOOPBACK)
> ret = ice_set_loopback(vsi, !!(features & NETIF_F_LOOPBACK));
>
> don't you need to set need_reset to true as well when you are disabling loopback in order to clear appropriate bits from registers?
>
ixgbe driver loopback enablement can interfere with NIC normal function configuration, so after test, a reset is needed and reconfigure NIC back to normal function.
> > + }
> > +
> > netdev->features = features;
> >
> > if ((changed & NETIF_F_HW_L2FW_DOFFLOAD) && adapter->num_rx_pools >
> > 1) @@ -10286,6 +10346,17 @@ static int ixgbe_xdp_setup(struct net_device *dev, struct bpf_prog *prog)
> > /* Wait until ndo_xsk_wakeup completes. */
> > synchronize_rcu();
> > err = ixgbe_setup_tc(dev, adapter->hw_tcs);
> > + if (adapter->hw.loopback_on) {
> > + u32 reg_data;
> > +
> > + reg_data = IXGBE_READ_REG(&adapter->hw, IXGBE_HLREG0);
> > + reg_data |= IXGBE_HLREG0_LPBK;
> > + IXGBE_WRITE_REG(&adapter->hw, IXGBE_HLREG0, reg_data);
> > +
> > + reg_data = IXGBE_READ_REG(&adapter->hw, IXGBE_MACC);
> > + reg_data |= IXGBE_MACC_FLU;
> > + IXGBE_WRITE_REG(&adapter->hw, IXGBE_MACC, reg_data);
>
> can you explain why do you need to set loopback bits again after they were set on ixgbe_force_loopback() ? are they not preserved after
> downing an interface?
>
In ixgbe NIC XDP initialization process, the corresponding register will be reset.
> > + }
> >
> > if (err)
> > return -EINVAL;
> > @@ -10969,6 +11040,8 @@ static int ixgbe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> > if (hw->mac.type >= ixgbe_mac_82599EB)
> > netdev->features |= NETIF_F_SCTP_CRC | NETIF_F_GSO_UDP_L4;
> >
> > + netdev->features |= NETIF_F_LOOPBACK;
> > +
> > #ifdef CONFIG_IXGBE_IPSEC
> > #define IXGBE_ESP_FEATURES (NETIF_F_HW_ESP | \
> > NETIF_F_HW_ESP_TX_CSUM | \
> > diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
> > b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
> > index 2b00db92b08f..ca50ccd59b50 100644
> > --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
> > +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
> > @@ -3652,6 +3652,7 @@ struct ixgbe_hw {
> > bool allow_unsupported_sfp;
> > bool wol_enabled;
> > bool need_crosstalk_fix;
> > + bool loopback_on;
>
> please explain why are you introducing this flag
>
Please refer to the previous comment.
> > };
> >
> > struct ixgbe_info {
> >
> > base-commit: 735c9ee9a374769b78c716de3c19a6c9440ede85
> > --
> > 2.34.1
> >
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