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Date: Thu, 19 Jan 2023 13:25:38 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: alejandro.lucero-palau@....com
Cc: netdev@...r.kernel.org, linux-net-drivers@....com,
davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
edumazet@...gle.com, habetsm@...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 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:
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.
>+ 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.
>+ return rc;
>+ }
>+
>+ rc = ef100_get_mac_address(devlink->efx, hw_addr, client_id, true);
Again, extack would be nice here if (rc)
>+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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