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Message-ID: <Y8p1kNvS4ofl1g2h@nanopsycho>
Date: Fri, 20 Jan 2023 12:05:52 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: "Lucero Palau, Alejandro" <alejandro.lucero-palau@....com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-net-drivers (AMD-Xilinx)" <linux-net-drivers@....com>,
"davem@...emloft.net" <davem@...emloft.net>,
"kuba@...nel.org" <kuba@...nel.org>,
"pabeni@...hat.com" <pabeni@...hat.com>,
"edumazet@...gle.com" <edumazet@...gle.com>,
"habetsm@...il.com" <habetsm@...il.com>,
"ecree.xilinx@...il.com" <ecree.xilinx@...il.com>
Subject: Re: [PATCH net-next 6/7] sfc: add support for
port_function_hw_addr_get devlink in ef100
Thu, Jan 19, 2023 at 03:59:40PM CET, alejandro.lucero-palau@....com wrote:
>
>On 1/19/23 12:25, Jiri Pirko wrote:
>> Thu, Jan 19, 2023 at 12:31:39PM CET, alejandro.lucero-palau@....com wrote:
>>> From: Alejandro Lucero <alejandro.lucero-palau@....com>
>>>
>>> Using the builtin client handle id infrastructure, this patch adds
>>> support for obtaining the mac address linked to mports in ef100. This
>>> implies to execute an MCDI command for getting the data from the
>>> firmware for each devlink port.
>>>
>>> Signed-off-by: Alejandro Lucero <alejandro.lucero-palau@....com>
>>> ---
>>> drivers/net/ethernet/sfc/ef100_nic.c | 27 ++++++++++++++++
>>> drivers/net/ethernet/sfc/ef100_nic.h | 1 +
>>> drivers/net/ethernet/sfc/ef100_rep.c | 8 +++++
>>> drivers/net/ethernet/sfc/ef100_rep.h | 1 +
>>> drivers/net/ethernet/sfc/efx_devlink.c | 44 ++++++++++++++++++++++++++
>>> 5 files changed, 81 insertions(+)
>>>
>>> diff --git a/drivers/net/ethernet/sfc/ef100_nic.c b/drivers/net/ethernet/sfc/ef100_nic.c
>>> index f4e913593f2b..4400ce622228 100644
>>> --- a/drivers/net/ethernet/sfc/ef100_nic.c
>>> +++ b/drivers/net/ethernet/sfc/ef100_nic.c
>>> @@ -1121,6 +1121,33 @@ static int ef100_probe_main(struct efx_nic *efx)
>>> return rc;
>>> }
>>>
>>> +/* MCDI commands are related to the same device issuing them. This function
>>> + * allows to do an MCDI command on behalf of another device, mainly PFs setting
>>> + * things for VFs.
>>> + */
>>> +int efx_ef100_lookup_client_id(struct efx_nic *efx, efx_qword_t pciefn, u32 *id)
>>> +{
>>> + MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_CLIENT_HANDLE_OUT_LEN);
>>> + MCDI_DECLARE_BUF(inbuf, MC_CMD_GET_CLIENT_HANDLE_IN_LEN);
>>> + u64 pciefn_flat = le64_to_cpu(pciefn.u64[0]);
>>> + size_t outlen;
>>> + int rc;
>>> +
>>> + MCDI_SET_DWORD(inbuf, GET_CLIENT_HANDLE_IN_TYPE,
>>> + MC_CMD_GET_CLIENT_HANDLE_IN_TYPE_FUNC);
>>> + MCDI_SET_QWORD(inbuf, GET_CLIENT_HANDLE_IN_FUNC,
>>> + pciefn_flat);
>>> +
>>> + rc = efx_mcdi_rpc(efx, MC_CMD_GET_CLIENT_HANDLE, inbuf, sizeof(inbuf),
>>> + outbuf, sizeof(outbuf), &outlen);
>>> + if (rc)
>>> + return rc;
>>> + if (outlen < sizeof(outbuf))
>>> + return -EIO;
>>> + *id = MCDI_DWORD(outbuf, GET_CLIENT_HANDLE_OUT_HANDLE);
>>> + return 0;
>>> +}
>>> +
>>> int ef100_probe_netdev_pf(struct efx_nic *efx)
>>> {
>>> struct ef100_nic_data *nic_data = efx->nic_data;
>>> diff --git a/drivers/net/ethernet/sfc/ef100_nic.h b/drivers/net/ethernet/sfc/ef100_nic.h
>>> index e59044072333..f1ed481c1260 100644
>>> --- a/drivers/net/ethernet/sfc/ef100_nic.h
>>> +++ b/drivers/net/ethernet/sfc/ef100_nic.h
>>> @@ -94,4 +94,5 @@ int ef100_filter_table_probe(struct efx_nic *efx);
>>>
>>> int ef100_get_mac_address(struct efx_nic *efx, u8 *mac_address,
>>> int client_handle, bool empty_ok);
>>> +int efx_ef100_lookup_client_id(struct efx_nic *efx, efx_qword_t pciefn, u32 *id);
>>> #endif /* EFX_EF100_NIC_H */
>>> diff --git a/drivers/net/ethernet/sfc/ef100_rep.c b/drivers/net/ethernet/sfc/ef100_rep.c
>>> index ff0c8da61919..974c9ff901a0 100644
>>> --- a/drivers/net/ethernet/sfc/ef100_rep.c
>>> +++ b/drivers/net/ethernet/sfc/ef100_rep.c
>>> @@ -362,6 +362,14 @@ bool ef100_mport_on_local_intf(struct efx_nic *efx,
>>> mport_desc->interface_idx == nic_data->local_mae_intf;
>>> }
>>>
>>> +bool ef100_mport_is_vf(struct mae_mport_desc *mport_desc)
>>> +{
>>> + bool pcie_func;
>>> +
>>> + pcie_func = ef100_mport_is_pcie_vnic(mport_desc);
>>> + return pcie_func && (mport_desc->vf_idx != MAE_MPORT_DESC_VF_IDX_NULL);
>>> +}
>>> +
>>> void efx_ef100_init_reps(struct efx_nic *efx)
>>> {
>>> struct ef100_nic_data *nic_data = efx->nic_data;
>>> diff --git a/drivers/net/ethernet/sfc/ef100_rep.h b/drivers/net/ethernet/sfc/ef100_rep.h
>>> index 9cca41614982..74853ccbc937 100644
>>> --- a/drivers/net/ethernet/sfc/ef100_rep.h
>>> +++ b/drivers/net/ethernet/sfc/ef100_rep.h
>>> @@ -75,4 +75,5 @@ void efx_ef100_fini_reps(struct efx_nic *efx);
>>> struct mae_mport_desc;
>>> bool ef100_mport_on_local_intf(struct efx_nic *efx,
>>> struct mae_mport_desc *mport_desc);
>>> +bool ef100_mport_is_vf(struct mae_mport_desc *mport_desc);
>>> #endif /* EF100_REP_H */
>>> diff --git a/drivers/net/ethernet/sfc/efx_devlink.c b/drivers/net/ethernet/sfc/efx_devlink.c
>>> index bb19d3ad7ffd..2a57c4f6d2b2 100644
>>> --- a/drivers/net/ethernet/sfc/efx_devlink.c
>>> +++ b/drivers/net/ethernet/sfc/efx_devlink.c
>>> @@ -429,6 +429,49 @@ static int efx_devlink_add_port(struct efx_nic *efx,
>>> return err;
>>> }
>>>
>>> +static int efx_devlink_port_addr_get(struct devlink_port *port, u8 *hw_addr,
>>> + int *hw_addr_len,
>>> + struct netlink_ext_ack *extack)
>>> +{
>>> + struct efx_devlink *devlink = devlink_priv(port->devlink);
>>> + struct mae_mport_desc *mport_desc;
>>> + efx_qword_t pciefn;
>>> + u32 client_id;
>>> + int rc = 0;
>>> +
>>> + mport_desc = efx_mae_get_mport(devlink->efx, port->index);
>> Dont use port->index, never. It's devlink internal. You have port
>> pointer passed here. Usually, what drivers do is to embed
>> the struct devlink_port in the driver port struct. Then you do just
>> simple container of to get it here. Mlxsw example:
>
>I do not understand this. Port index is set by the driver not by the
>devlink interface implementation.
>
>Why can I not use it?
Well you can, but things could be done much nicer, when you use
devlink_port pointer. Also, better not to access devlink_port struct
internals, driver should never need it.
>
>> static void *__dl_port(struct devlink_port *devlink_port)
>> {
>> return container_of(devlink_port, struct mlxsw_core_port, devlink_port);
>> }
>>
>> static int mlxsw_devlink_port_split(struct devlink *devlink,
>> struct devlink_port *port,
>> unsigned int count,
>> struct netlink_ext_ack *extack)
>> {
>> struct mlxsw_core_port *mlxsw_core_port = __dl_port(port);
>> ...
>>
>>
>>
>>> + if (!mport_desc)
>> Tell the user what's wrong, extack is here for that.
>>
>I'll do.
>>
>>> + return -EINVAL;
>>> +
>>> + if (!ef100_mport_on_local_intf(devlink->efx, mport_desc))
>>> + goto out;
>>> +
>>> + if (ef100_mport_is_vf(mport_desc))
>>> + EFX_POPULATE_QWORD_3(pciefn,
>>> + PCIE_FUNCTION_PF, PCIE_FUNCTION_PF_NULL,
>>> + PCIE_FUNCTION_VF, mport_desc->vf_idx,
>>> + PCIE_FUNCTION_INTF, PCIE_INTERFACE_CALLER);
>>> + else
>>> + EFX_POPULATE_QWORD_3(pciefn,
>>> + PCIE_FUNCTION_PF, mport_desc->pf_idx,
>>> + PCIE_FUNCTION_VF, PCIE_FUNCTION_VF_NULL,
>>> + PCIE_FUNCTION_INTF, PCIE_INTERFACE_CALLER);
>>> +
>>> + rc = efx_ef100_lookup_client_id(devlink->efx, pciefn, &client_id);
>>> + if (rc) {
>>> + netif_err(devlink->efx, drv, devlink->efx->net_dev,
>>> + "Failed to get client ID for port index %u, rc %d\n",
>>> + port->index, rc);
>> Don't write to dmesg, use extack msg instead.
>
>
>I'll do.
>
>Thanks
>
>>
>>> + return rc;
>>> + }
>>> +
>>> + rc = ef100_get_mac_address(devlink->efx, hw_addr, client_id, true);
>> Again, extack would be nice here if (rc)
>>
>Again, I'll do.
>>> +out:
>>> + *hw_addr_len = ETH_ALEN;
>>> +
>>> + return rc;
>>> +}
>>> +
>>> static int efx_devlink_info_get(struct devlink *devlink,
>>> struct devlink_info_req *req,
>>> struct netlink_ext_ack *extack)
>>> @@ -442,6 +485,7 @@ static int efx_devlink_info_get(struct devlink *devlink,
>>>
>>> static const struct devlink_ops sfc_devlink_ops = {
>>> .info_get = efx_devlink_info_get,
>>> + .port_function_hw_addr_get = efx_devlink_port_addr_get,
>>> };
>>>
>>> static struct devlink_port *ef100_set_devlink_port(struct efx_nic *efx, u32 idx)
>>> --
>>> 2.17.1
>>>
>
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