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Message-ID: <e3ecadeb-e3d5-d5b0-c472-c5899ade0349@amd.com>
Date: Mon, 23 Jan 2023 09:45:47 +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>,
"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
On 1/23/23 08:38, Jiri Pirko wrote:
> Sun, Jan 22, 2023 at 05:36:14PM CET, alejandro.lucero-palau@....com wrote:
>> On 1/20/23 12:48, Lucero Palau, Alejandro wrote:
>>> On 1/20/23 11:08, Jiri Pirko wrote:
>>>> Thu, Jan 19, 2023 at 04:09:27PM CET, alejandro.lucero-palau@....com wrote:
>>>>> On 1/19/23 12:37, 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);
>>>>>> I may be missing something, where do you fail with -EOPNOTSUPP
>>>>>> in case this is called for PHYSICAL port ?
>>>>>>
>>>>> We do not create a devlink port for the physical port.
>>>> Well, you do:
>>>>
>>>> + switch (mport->mport_type) {
>>>> + case MAE_MPORT_DESC_MPORT_TYPE_NET_PORT:
>>>> + attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
>>>>
>>>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>> Right.
>>>
>>> I was relying on devlink-port output which does not show the physical
>>> port in my machine and completely forgot about it.
>>>
>>> I'm a bit confused at this point. Let me look at this further.
>>>
>> The reason devlink show/info does not report the PHYSICAL port is
>> simple: current code does not create a devlink port for such mport.
>>
>> I say current code because in my first implementation (not upstreamed) I
>> just created devlink ports when the mports where enumerated, what turned
>> out to be a bit complicated for dealing with VFs creation/destruction,
>> and after looking at how other drivers do this, just before the related
>> netdev is registered, I went for that same approach. That leaves no
>> option for the physical mport registered.
>>
>> I could add that creation at PF devlink port creation, if we consider
>> this a necessity. I know the ideal devlink support in our driver should
>> likely be more devlink design compliant, but it is also true drivers
>> should make use of it as decided for fulfilling their necessities as
>> long as it does not create confusion to users. Our current devlink
>> necessity is for dealing with setting VFs mac address as required during
>> previous representors patchset review:
>>
>> https://lore.kernel.org/netdev/20220728092008.2117846e@kernel.org/
>>
>> Do you see a problem not creating such a devlink port by now?
> You don't have to create it. But loose the code setting PHYSICAL
> flavour.
>
I'll do so adding a comment discarding the physical port creation.
Thanks.
>
>>>> + attrs.phys.port_number = mport->port_idx;
>>>> + devlink_port_attrs_set(dl_port, &attrs);
>>>> + break;
>>>> + case MAE_MPORT_DESC_MPORT_TYPE_VNIC:
>>>> + if (mport->vf_idx != MAE_MPORT_DESC_VF_IDX_NULL) {
>>>> + devlink_port_attrs_pci_vf_set(dl_port, 0, mport->pf_idx,
>>>> + mport->vf_idx,
>>>> + external);
>>>> + } else {
>>>> + devlink_port_attrs_pci_pf_set(dl_port, 0, mport->pf_idx,
>>>> + external);
>>>> + }
>>>> + break;
>>>>
>>>>
>>>>
>>>>
>>>>> I'm aware this is not "fully compliant" with devlink design idea, just
>>>>> trying to use it for our current urgent necessities by now.
>>>>>
>>>>> Do you think this could be a problem?
>>>> If you create port flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL and it is not
>>>> uplink, it is a problem :)
>>>>
>>>>
>>>>
>>>>>>> + if (!mport_desc)
>>>>>>> + 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);
>>>>>>> + return rc;
>>>>>>> + }
>>>>>>> +
>>>>>>> + rc = ef100_get_mac_address(devlink->efx, hw_addr, client_id, true);
>>>>>>> +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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