linux-kernel - Re: [RFC PATCH v8 07/10] ice: add admin commands to access cgu configuration

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Message-ID: <ZIQ4YCX+1FbZHpRQ@nanopsycho>
Date:   Sat, 10 Jun 2023 10:46:24 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
Cc:     kuba@...nel.org, vadfed@...a.com, jonathan.lemon@...il.com,
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        vadim.fedorenko@...ux.dev
Subject: Re: [RFC PATCH v8 07/10] ice: add admin commands to access cgu
 configuration

Fri, Jun 09, 2023 at 02:18:50PM CEST, arkadiusz.kubalewski@...el.com wrote:
>Add firmware admin command to access clock generation unit
>configuration, it is required to enable Extended PTP and SyncE features
>in the driver.

Empty line here perhaps?


>Add definitions of possible hardware variations of input and output pins
>related to clock generation unit and functions to access the data.
>
>Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>

I just skimmed over this, not really give it much of a time. Couple of
nits:


>+
>+#define MAX_NETLIST_SIZE	10

Prefix perhaps?

[...]


>+/**
>+ * convert_s48_to_s64 - convert 48 bit value to 64 bit value
>+ * @signed_48: signed 64 bit variable storing signed 48 bit value
>+ *
>+ * Convert signed 48 bit value to its 64 bit representation.
>+ *
>+ * Return: signed 64 bit representation of signed 48 bit value.
>+ */
>+static inline

Never use "inline" in a c file.


>+s64 convert_s48_to_s64(s64 signed_48)
>+{
>+	const s64 MASK_SIGN_BITS = GENMASK_ULL(63, 48);

variable with capital letters? Not nice. Define? You have that multiple
times in the patch.


>+	const s64 SIGN_BIT_47 = BIT_ULL(47);
>+
>+	return ((signed_48 & SIGN_BIT_47) ? (s64)(MASK_SIGN_BITS | signed_48)

Pointless cast, isn't it?

You don't need () around "signed_48 & SIGN_BIT_47"


>+		: signed_48);

Return is not a function. Drop the outer "()"s.


The whole fuction can look like:
static s64 convert_s48_to_s64(s64 signed_48)
{
	return signed_48 & BIT_ULL(47) ? signed_48 | GENMASK_ULL(63, 48) :
					 signed_48;
}

Nicer?


[...]



>+int ice_get_pf_c827_idx(struct ice_hw *hw, u8 *idx)
>+{
>+	struct ice_aqc_get_link_topo cmd;
>+	u8 node_part_number;
>+	u16 node_handle;
>+	int status;
>+	u8 ctx;
>+
>+	if (hw->mac_type != ICE_MAC_E810)
>+		return -ENODEV;
>+
>+	if (hw->device_id != ICE_DEV_ID_E810C_QSFP) {
>+		*idx = C827_0;
>+		return 0;
>+	}
>+
>+	memset(&cmd, 0, sizeof(cmd));
>+
>+	ctx = ICE_AQC_LINK_TOPO_NODE_TYPE_PHY << ICE_AQC_LINK_TOPO_NODE_TYPE_S;
>+	ctx |= ICE_AQC_LINK_TOPO_NODE_CTX_PORT << ICE_AQC_LINK_TOPO_NODE_CTX_S;
>+	cmd.addr.topo_params.node_type_ctx = ctx;
>+	cmd.addr.topo_params.index = 0;

You zeroed the struct 4 lines above...


>+
>+	status = ice_aq_get_netlist_node(hw, &cmd, &node_part_number,
>+					 &node_handle);
>+	if (status || node_part_number != ICE_ACQ_GET_LINK_TOPO_NODE_NR_C827)
>+		return -ENOENT;
>+
>+	if (node_handle == E810C_QSFP_C827_0_HANDLE)
>+		*idx = C827_0;
>+	else if (node_handle == E810C_QSFP_C827_1_HANDLE)
>+		*idx = C827_1;
>+	else
>+		return -EIO;
>+
>+	return 0;
>+}
>+

[...]