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i40e: allow toggling loopback mode via ndo_set_features callback 

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.

This feature is used for the xsk selftests, and might have other uses
too.

Signed-off-by: Tirthendu Sarkar <tirthendu.sarkar@intel.com>
Reviewed-by: Alexander Lobakin <alexandr.lobakin@intel.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Tested-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Link: https://lore.kernel.org/r/20221209185553.2520088-1-anthony.l.nguyen@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Tirthendu Sarkar 2022-12-09 10:55:53 -08:00 committed by Jakub Kicinski
parent 2a78dd22c2
commit b1746fbab1
4 changed files with 61 additions and 4 deletions
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8
drivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h
View File

@ -1795,9 +1795,11 @@ I40E_CHECK_CMD_LENGTH(i40e_aqc_an_advt_reg);
/* Set Loopback mode (0x0618) */
struct i40e_aqc_set_lb_mode {
__le16 lb_mode;
#define I40E_AQ_LB_PHY_LOCAL 0x01
#define I40E_AQ_LB_PHY_REMOTE 0x02
#define I40E_AQ_LB_MAC_LOCAL 0x04
#define I40E_LEGACY_LOOPBACK_NVM_VER 0x6000
#define I40E_AQ_LB_MAC_LOCAL 0x01
#define I40E_AQ_LB_PHY_LOCAL 0x05
#define I40E_AQ_LB_PHY_REMOTE 0x06
#define I40E_AQ_LB_MAC_LOCAL_LEGACY 0x04
u8 reserved[14];
};

26
drivers/net/ethernet/intel/i40e/i40e_common.c
View File

@ -1830,6 +1830,32 @@ i40e_status i40e_aq_set_phy_int_mask(struct i40e_hw *hw,
return status;
}
/**
* i40e_aq_set_mac_loopback
* @hw: pointer to the HW struct
* @ena_lpbk: Enable or Disable loopback
* @cmd_details: pointer to command details structure or NULL
*
* Enable/disable loopback on a given port
*/
i40e_status i40e_aq_set_mac_loopback(struct i40e_hw *hw, bool ena_lpbk,
struct i40e_asq_cmd_details *cmd_details)
{
struct i40e_aq_desc desc;
struct i40e_aqc_set_lb_mode *cmd =
(struct i40e_aqc_set_lb_mode *)&desc.params.raw;
i40e_fill_default_direct_cmd_desc(&desc, i40e_aqc_opc_set_lb_modes);
if (ena_lpbk) {
if (hw->nvm.version <= I40E_LEGACY_LOOPBACK_NVM_VER)
cmd->lb_mode = cpu_to_le16(I40E_AQ_LB_MAC_LOCAL_LEGACY);
else
cmd->lb_mode = cpu_to_le16(I40E_AQ_LB_MAC_LOCAL);
}
return i40e_asq_send_command(hw, &desc, NULL, 0, cmd_details);
}
/**
* i40e_aq_set_phy_debug
* @hw: pointer to the hw struct

28
drivers/net/ethernet/intel/i40e/i40e_main.c
View File

@ -12937,6 +12937,29 @@ static void i40e_clear_rss_lut(struct i40e_vsi *vsi)
}
}
/**
* i40e_set_loopback - turn on/off loopback mode on underlying PF
* @vsi: ptr to VSI
* @ena: flag to indicate the on/off setting
*/
static int i40e_set_loopback(struct i40e_vsi *vsi, bool ena)
{
bool if_running = netif_running(vsi->netdev) &&
!test_and_set_bit(__I40E_VSI_DOWN, vsi->state);
int ret;
if (if_running)
i40e_down(vsi);
ret = i40e_aq_set_mac_loopback(&vsi->back->hw, ena, NULL);
if (ret)
netdev_err(vsi->netdev, "Failed to toggle loopback state\n");
if (if_running)
i40e_up(vsi);
return ret;
}
/**
* i40e_set_features - set the netdev feature flags
* @netdev: ptr to the netdev being adjusted
@ -12977,6 +13000,9 @@ static int i40e_set_features(struct net_device *netdev,
if (need_reset)
i40e_do_reset(pf, I40E_PF_RESET_FLAG, true);
if ((features ^ netdev->features) & NETIF_F_LOOPBACK)
return i40e_set_loopback(vsi, !!(features & NETIF_F_LOOPBACK));
return 0;
}
@ -13739,7 +13765,7 @@ static int i40e_config_netdev(struct i40e_vsi *vsi)
if (!(pf->flags & I40E_FLAG_MFP_ENABLED))
hw_features |= NETIF_F_NTUPLE | NETIF_F_HW_TC;
netdev->hw_features |= hw_features;
netdev->hw_features |= hw_features | NETIF_F_LOOPBACK;
netdev->features |= hw_features | NETIF_F_HW_VLAN_CTAG_FILTER;
netdev->hw_enc_features |= NETIF_F_TSO_MANGLEID;

3
drivers/net/ethernet/intel/i40e/i40e_prototype.h
View File

@ -105,6 +105,9 @@ enum i40e_status_code i40e_aq_set_phy_config(struct i40e_hw *hw,
struct i40e_asq_cmd_details *cmd_details);
enum i40e_status_code i40e_set_fc(struct i40e_hw *hw, u8 *aq_failures,
bool atomic_reset);
i40e_status i40e_aq_set_mac_loopback(struct i40e_hw *hw,
bool ena_lpbk,
struct i40e_asq_cmd_details *cmd_details);
i40e_status i40e_aq_set_phy_int_mask(struct i40e_hw *hw, u16 mask,
struct i40e_asq_cmd_details *cmd_details);
i40e_status i40e_aq_clear_pxe_mode(struct i40e_hw *hw,