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Date: Sun, 22 Jan 2023 16:41:24 +0000
From: "Lucero Palau, Alejandro" <alejandro.lucero-palau@....com>
To: Jiri Pirko <jiri@...nulli.us>,
"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>,
"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
On 1/20/23 11:05, Jiri Pirko wrote:
> 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.
>
I think adding a new field in mport struct for this is not hard, so I'll
follow your advice and change it in the next patchset version.
Thanks.
>>> 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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