netdev - Re: [PATCH v5 net-next 8/8] sfc: add support for devlink port_function_hw_addr

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Date:   Thu, 2 Feb 2023 13:13:22 +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.xilinx@...il.com,
        ecree.xilinx@...il.com, linux-doc@...r.kernel.org, corbet@....net,
        jiri@...dia.com
Subject: Re: [PATCH v5 net-next 8/8] sfc: add support for devlink
 port_function_hw_addr_set in ef100

Thu, Feb 02, 2023 at 12:14:23PM 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 setting the mac address linked to mports in ef100. This
>implies to execute an MCDI command for giving the address to the
>firmware for the specific devlink port.
>
>Signed-off-by: Alejandro Lucero <alejandro.lucero-palau@....com>

Please check my notes to the previuous patch, most of them applies on
this one as well. Couple more below.



>---
> drivers/net/ethernet/sfc/efx_devlink.c | 50 ++++++++++++++++++++++++++
> 1 file changed, 50 insertions(+)
>
>diff --git a/drivers/net/ethernet/sfc/efx_devlink.c b/drivers/net/ethernet/sfc/efx_devlink.c
>index c44547b9894e..bcb8543b43ba 100644
>--- a/drivers/net/ethernet/sfc/efx_devlink.c
>+++ b/drivers/net/ethernet/sfc/efx_devlink.c
>@@ -110,6 +110,55 @@ static int efx_devlink_port_addr_get(struct devlink_port *port, u8 *hw_addr,
> 	return rc;
> }
> 
>+static int efx_devlink_port_addr_set(struct devlink_port *port,
>+				     const u8 *hw_addr, int hw_addr_len,
>+				     struct netlink_ext_ack *extack)
>+{
>+	MCDI_DECLARE_BUF(inbuf, MC_CMD_SET_CLIENT_MAC_ADDRESSES_IN_LEN(1));
>+	struct efx_devlink *devlink = devlink_priv(port->devlink);
>+	struct mae_mport_desc *mport_desc;
>+	efx_qword_t pciefn;
>+	u32 client_id;
>+	int rc;
>+
>+	mport_desc = container_of(port, struct mae_mport_desc, dl_port);
>+
>+	if (!ef100_mport_is_vf(mport_desc)) {
>+		NL_SET_ERR_MSG_FMT(extack,
>+				   "port mac change not allowed (mport: %u)",

"Port" with "P"? Be consistent with extack messages.
Also "MAC", as you used that in the previous patch.



>+				   mport_desc->mport_id);
>+		return -EPERM;
>+	}
>+
>+	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);
>+
>+	rc = efx_ef100_lookup_client_id(devlink->efx, pciefn, &client_id);
>+	if (rc) {
>+		NL_SET_ERR_MSG_FMT(extack,
>+				   "No internal client_ID for port (mport: %u)",
>+				   mport_desc->mport_id);
>+		return rc;
>+	}
>+
>+	MCDI_SET_DWORD(inbuf, SET_CLIENT_MAC_ADDRESSES_IN_CLIENT_HANDLE,
>+		       client_id);
>+
>+	ether_addr_copy(MCDI_PTR(inbuf, SET_CLIENT_MAC_ADDRESSES_IN_MAC_ADDRS),
>+			hw_addr);
>+
>+	rc = efx_mcdi_rpc(devlink->efx, MC_CMD_SET_CLIENT_MAC_ADDRESSES, inbuf,
>+			  sizeof(inbuf), NULL, 0, NULL);
>+	if (rc)
>+		NL_SET_ERR_MSG_FMT(extack,
>+				   "sfc MC_CMD_SET_CLIENT_MAC_ADDRESSES mcdi error (mport: %u)",

I have no clue why to put name of the driver in the extack. Don't do it.
Also, what does "MC_CMD_SET_CLIENT_MAC_ADDRESSES" tell to the user?


>+				   mport_desc->mport_id);
>+
>+	return rc;
>+}
>+
> #endif
> 
> static int efx_devlink_info_nvram_partition(struct efx_nic *efx,
>@@ -574,6 +623,7 @@ static const struct devlink_ops sfc_devlink_ops = {
> 	.info_get			= efx_devlink_info_get,
> #ifdef CONFIG_SFC_SRIOV
> 	.port_function_hw_addr_get	= efx_devlink_port_addr_get,
>+	.port_function_hw_addr_set	= efx_devlink_port_addr_set,
> #endif
> };
> 
>-- 
>2.17.1
>