net: mscc: ocelot: refactor ocelot_port_inject_frame out of ocelot_port_xmit

The felix DSA driver will inject some frames through register MMIO, same
as ocelot switchdev currently does. So we need to be able to reuse the
common code.

Also create some shim definitions, since the DSA tagger can be compiled
without support for the switch driver.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mscc/ocelot.c

@@ -628,6 +628,86 @@ void ocelot_get_txtstamp(struct ocelot *ocelot)
 }
 EXPORT_SYMBOL(ocelot_get_txtstamp);
 
+/* Generate the IFH for frame injection
+ *
+ * The IFH is a 128bit-value
+ * bit 127: bypass the analyzer processing
+ * bit 56-67: destination mask
+ * bit 28-29: pop_cnt: 3 disables all rewriting of the frame
+ * bit 20-27: cpu extraction queue mask
+ * bit 16: tag type 0: C-tag, 1: S-tag
+ * bit 0-11: VID
+ */
+static int ocelot_gen_ifh(u32 *ifh, struct frame_info *info)
+{
+	ifh[0] = IFH_INJ_BYPASS | ((0x1ff & info->rew_op) << 21);
+	ifh[1] = (0xf00 & info->port) >> 8;
+	ifh[2] = (0xff & info->port) << 24;
+	ifh[3] = (info->tag_type << 16) | info->vid;
+
+	return 0;
+}
+
+bool ocelot_can_inject(struct ocelot *ocelot, int grp)
+{
+	u32 val = ocelot_read(ocelot, QS_INJ_STATUS);
+
+	if (!(val & QS_INJ_STATUS_FIFO_RDY(BIT(grp))))
+		return false;
+	if (val & QS_INJ_STATUS_WMARK_REACHED(BIT(grp)))
+		return false;
+
+	return true;
+}
+EXPORT_SYMBOL(ocelot_can_inject);
+
+void ocelot_port_inject_frame(struct ocelot *ocelot, int port, int grp,
+			      u32 rew_op, struct sk_buff *skb)
+{
+	struct frame_info info = {};
+	u32 ifh[OCELOT_TAG_LEN / 4];
+	unsigned int i, count, last;
+
+	ocelot_write_rix(ocelot, QS_INJ_CTRL_GAP_SIZE(1) |
+			 QS_INJ_CTRL_SOF, QS_INJ_CTRL, grp);
+
+	info.port = BIT(port);
+	info.tag_type = IFH_TAG_TYPE_C;
+	info.vid = skb_vlan_tag_get(skb);
+	info.rew_op = rew_op;
+
+	ocelot_gen_ifh(ifh, &info);
+
+	for (i = 0; i < OCELOT_TAG_LEN / 4; i++)
+		ocelot_write_rix(ocelot, (__force u32)cpu_to_be32(ifh[i]),
+				 QS_INJ_WR, grp);
+
+	count = DIV_ROUND_UP(skb->len, 4);
+	last = skb->len % 4;
+	for (i = 0; i < count; i++)
+		ocelot_write_rix(ocelot, ((u32 *)skb->data)[i], QS_INJ_WR, grp);
+
+	/* Add padding */
+	while (i < (OCELOT_BUFFER_CELL_SZ / 4)) {
+		ocelot_write_rix(ocelot, 0, QS_INJ_WR, grp);
+		i++;
+	}
+
+	/* Indicate EOF and valid bytes in last word */
+	ocelot_write_rix(ocelot, QS_INJ_CTRL_GAP_SIZE(1) |
+			 QS_INJ_CTRL_VLD_BYTES(skb->len < OCELOT_BUFFER_CELL_SZ ? 0 : last) |
+			 QS_INJ_CTRL_EOF,
+			 QS_INJ_CTRL, grp);
+
+	/* Add dummy CRC */
+	ocelot_write_rix(ocelot, 0, QS_INJ_WR, grp);
+	skb_tx_timestamp(skb);
+
+	skb->dev->stats.tx_packets++;
+	skb->dev->stats.tx_bytes += skb->len;
+}
+EXPORT_SYMBOL(ocelot_port_inject_frame);
+
 int ocelot_fdb_add(struct ocelot *ocelot, int port,
 		   const unsigned char *addr, u16 vid)
 {

drivers/net/ethernet/mscc/ocelot_net.c

@@ -488,53 +488,20 @@ static int ocelot_port_stop(struct net_device *dev)
 	return 0;
 }
 
-/* Generate the IFH for frame injection
- *
- * The IFH is a 128bit-value
- * bit 127: bypass the analyzer processing
- * bit 56-67: destination mask
- * bit 28-29: pop_cnt: 3 disables all rewriting of the frame
- * bit 20-27: cpu extraction queue mask
- * bit 16: tag type 0: C-tag, 1: S-tag
- * bit 0-11: VID
- */
-static int ocelot_gen_ifh(u32 *ifh, struct frame_info *info)
-{
-	ifh[0] = IFH_INJ_BYPASS | ((0x1ff & info->rew_op) << 21);
-	ifh[1] = (0xf00 & info->port) >> 8;
-	ifh[2] = (0xff & info->port) << 24;
-	ifh[3] = (info->tag_type << 16) | info->vid;
-
-	return 0;
-}
-
-static int ocelot_port_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t ocelot_port_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct ocelot_port_private *priv = netdev_priv(dev);
-	struct skb_shared_info *shinfo = skb_shinfo(skb);
 	struct ocelot_port *ocelot_port = &priv->port;
 	struct ocelot *ocelot = ocelot_port->ocelot;
-	u32 val, ifh[OCELOT_TAG_LEN / 4];
-	struct frame_info info = {};
-	u8 grp = 0; /* Send everything on CPU group 0 */
-	unsigned int i, count, last;
 	int port = priv->chip_port;
+	u32 rew_op = 0;
 
-	val = ocelot_read(ocelot, QS_INJ_STATUS);
-	if (!(val & QS_INJ_STATUS_FIFO_RDY(BIT(grp))) ||
-	    (val & QS_INJ_STATUS_WMARK_REACHED(BIT(grp))))
+	if (!ocelot_can_inject(ocelot, 0))
 		return NETDEV_TX_BUSY;
 
-	ocelot_write_rix(ocelot, QS_INJ_CTRL_GAP_SIZE(1) |
-			 QS_INJ_CTRL_SOF, QS_INJ_CTRL, grp);
-
-	info.port = BIT(port);
-	info.tag_type = IFH_TAG_TYPE_C;
-	info.vid = skb_vlan_tag_get(skb);
-
 	/* Check if timestamping is needed */
-	if (ocelot->ptp && (shinfo->tx_flags & SKBTX_HW_TSTAMP)) {
-		info.rew_op = ocelot_port->ptp_cmd;
+	if (ocelot->ptp && (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) {
+		rew_op = ocelot_port->ptp_cmd;
 
 		if (ocelot_port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP) {
 			struct sk_buff *clone;
@@ -547,45 +514,11 @@ static int ocelot_port_xmit(struct sk_buff *skb, struct net_device *dev)
 
 			ocelot_port_add_txtstamp_skb(ocelot, port, clone);
 
-			info.rew_op |= clone->cb[0] << 3;
+			rew_op |= clone->cb[0] << 3;
 		}
 	}
 
-	if (ocelot->ptp && shinfo->tx_flags & SKBTX_HW_TSTAMP) {
-		info.rew_op = ocelot_port->ptp_cmd;
-		if (ocelot_port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP)
-			info.rew_op |= skb->cb[0] << 3;
-	}
-
-	ocelot_gen_ifh(ifh, &info);
-
-	for (i = 0; i < OCELOT_TAG_LEN / 4; i++)
-		ocelot_write_rix(ocelot, (__force u32)cpu_to_be32(ifh[i]),
-				 QS_INJ_WR, grp);
-
-	count = DIV_ROUND_UP(skb->len, 4);
-	last = skb->len % 4;
-	for (i = 0; i < count; i++)
-		ocelot_write_rix(ocelot, ((u32 *)skb->data)[i], QS_INJ_WR, grp);
-
-	/* Add padding */
-	while (i < (OCELOT_BUFFER_CELL_SZ / 4)) {
-		ocelot_write_rix(ocelot, 0, QS_INJ_WR, grp);
-		i++;
-	}
-
-	/* Indicate EOF and valid bytes in last word */
-	ocelot_write_rix(ocelot, QS_INJ_CTRL_GAP_SIZE(1) |
-			 QS_INJ_CTRL_VLD_BYTES(skb->len < OCELOT_BUFFER_CELL_SZ ? 0 : last) |
-			 QS_INJ_CTRL_EOF,
-			 QS_INJ_CTRL, grp);
-
-	/* Add dummy CRC */
-	ocelot_write_rix(ocelot, 0, QS_INJ_WR, grp);
-	skb_tx_timestamp(skb);
-
-	dev->stats.tx_packets++;
-	dev->stats.tx_bytes += skb->len;
+	ocelot_port_inject_frame(ocelot, port, 0, rew_op, skb);
 
 	kfree_skb(skb);
 

include/soc/mscc/ocelot.h

@@ -742,6 +742,28 @@ u32 __ocelot_target_read_ix(struct ocelot *ocelot, enum ocelot_target target,
 void __ocelot_target_write_ix(struct ocelot *ocelot, enum ocelot_target target,
 			      u32 val, u32 reg, u32 offset);
 
+/* Packet I/O */
+#if IS_ENABLED(CONFIG_MSCC_OCELOT_SWITCH_LIB)
+
+bool ocelot_can_inject(struct ocelot *ocelot, int grp);
+void ocelot_port_inject_frame(struct ocelot *ocelot, int port, int grp,
+			      u32 rew_op, struct sk_buff *skb);
+
+#else
+
+static inline bool ocelot_can_inject(struct ocelot *ocelot, int grp)
+{
+	return false;
+}
+
+static inline void ocelot_port_inject_frame(struct ocelot *ocelot, int port,
+					    int grp, u32 rew_op,
+					    struct sk_buff *skb)
+{
+}
+
+#endif
+
 /* Hardware initialization */
 int ocelot_regfields_init(struct ocelot *ocelot,
 			  const struct reg_field *const regfields);