net:enetc: command BD ring data memory alloc as one function alone

Separate the CBDR data memory alloc standalone. It is convenient for
other part loading, for example the ENETC QOS part.
Reported-and-suggested-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Po Liu <po.liu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/enetc/enetc.h

@@ -18,6 +18,8 @@
 #define ENETC_MAX_MTU		(ENETC_MAC_MAXFRM_SIZE - \
 				(ETH_FCS_LEN + ETH_HLEN + VLAN_HLEN))
 
+#define ENETC_CBD_DATA_MEM_ALIGN 64
+
 struct enetc_tx_swbd {
 	union {
 		struct sk_buff *skb;
@@ -415,6 +417,42 @@ int enetc_get_rss_table(struct enetc_si *si, u32 *table, int count);
 int enetc_set_rss_table(struct enetc_si *si, const u32 *table, int count);
 int enetc_send_cmd(struct enetc_si *si, struct enetc_cbd *cbd);
 
+static inline void *enetc_cbd_alloc_data_mem(struct enetc_si *si,
+					     struct enetc_cbd *cbd,
+					     int size, dma_addr_t *dma,
+					     void **data_align)
+{
+	struct enetc_cbdr *ring = &si->cbd_ring;
+	dma_addr_t dma_align;
+	void *data;
+
+	data = dma_alloc_coherent(ring->dma_dev,
+				  size + ENETC_CBD_DATA_MEM_ALIGN,
+				  dma, GFP_KERNEL);
+	if (!data) {
+		dev_err(ring->dma_dev, "CBD alloc data memory failed!\n");
+		return NULL;
+	}
+
+	dma_align = ALIGN(*dma, ENETC_CBD_DATA_MEM_ALIGN);
+	*data_align = PTR_ALIGN(data, ENETC_CBD_DATA_MEM_ALIGN);
+
+	cbd->addr[0] = cpu_to_le32(lower_32_bits(dma_align));
+	cbd->addr[1] = cpu_to_le32(upper_32_bits(dma_align));
+	cbd->length = cpu_to_le16(size);
+
+	return data;
+}
+
+static inline void enetc_cbd_free_data_mem(struct enetc_si *si, int size,
+					   void *data, dma_addr_t *dma)
+{
+	struct enetc_cbdr *ring = &si->cbd_ring;
+
+	dma_free_coherent(ring->dma_dev, size + ENETC_CBD_DATA_MEM_ALIGN,
+			  data, *dma);
+}
+
 #ifdef CONFIG_FSL_ENETC_QOS
 int enetc_setup_tc_taprio(struct net_device *ndev, void *type_data);
 void enetc_sched_speed_set(struct enetc_ndev_priv *priv, int speed);

drivers/net/ethernet/freescale/enetc/enetc_cbdr.c

@@ -166,70 +166,55 @@ int enetc_set_mac_flt_entry(struct enetc_si *si, int index,
 	return enetc_send_cmd(si, &cbd);
 }
 
-#define RFSE_ALIGN	64
 /* Set entry in RFS table */
 int enetc_set_fs_entry(struct enetc_si *si, struct enetc_cmd_rfse *rfse,
 		       int index)
 {
 	struct enetc_cbdr *ring = &si->cbd_ring;
 	struct enetc_cbd cbd = {.cmd = 0};
-	dma_addr_t dma, dma_align;
 	void *tmp, *tmp_align;
+	dma_addr_t dma;
 	int err;
 
 	/* fill up the "set" descriptor */
 	cbd.cmd = 0;
 	cbd.cls = 4;
 	cbd.index = cpu_to_le16(index);
-	cbd.length = cpu_to_le16(sizeof(*rfse));
 	cbd.opt[3] = cpu_to_le32(0); /* SI */
 
-	tmp = dma_alloc_coherent(ring->dma_dev, sizeof(*rfse) + RFSE_ALIGN,
-				 &dma, GFP_KERNEL);
-	if (!tmp) {
-		dev_err(ring->dma_dev, "DMA mapping of RFS entry failed!\n");
+	tmp = enetc_cbd_alloc_data_mem(si, &cbd, sizeof(*rfse),
+				       &dma, &tmp_align);
+	if (!tmp)
 		return -ENOMEM;
-	}
 
-	dma_align = ALIGN(dma, RFSE_ALIGN);
-	tmp_align = PTR_ALIGN(tmp, RFSE_ALIGN);
 	memcpy(tmp_align, rfse, sizeof(*rfse));
 
-	cbd.addr[0] = cpu_to_le32(lower_32_bits(dma_align));
-	cbd.addr[1] = cpu_to_le32(upper_32_bits(dma_align));
-
 	err = enetc_send_cmd(si, &cbd);
 	if (err)
 		dev_err(ring->dma_dev, "FS entry add failed (%d)!", err);
 
-	dma_free_coherent(ring->dma_dev, sizeof(*rfse) + RFSE_ALIGN,
-			  tmp, dma);
+	enetc_cbd_free_data_mem(si, sizeof(*rfse), tmp, &dma);
 
 	return err;
 }
 
-#define RSSE_ALIGN	64
 static int enetc_cmd_rss_table(struct enetc_si *si, u32 *table, int count,
 			       bool read)
 {
 	struct enetc_cbdr *ring = &si->cbd_ring;
 	struct enetc_cbd cbd = {.cmd = 0};
-	dma_addr_t dma, dma_align;
 	u8 *tmp, *tmp_align;
+	dma_addr_t dma;
 	int err, i;
 
-	if (count < RSSE_ALIGN)
+	if (count < ENETC_CBD_DATA_MEM_ALIGN)
 		/* HW only takes in a full 64 entry table */
 		return -EINVAL;
 
-	tmp = dma_alloc_coherent(ring->dma_dev, count + RSSE_ALIGN,
-				 &dma, GFP_KERNEL);
-	if (!tmp) {
-		dev_err(ring->dma_dev, "DMA mapping of RSS table failed!\n");
+	tmp = enetc_cbd_alloc_data_mem(si, &cbd, count,
+				       &dma, (void *)&tmp_align);
+	if (!tmp)
 		return -ENOMEM;
-	}
-	dma_align = ALIGN(dma, RSSE_ALIGN);
-	tmp_align = PTR_ALIGN(tmp, RSSE_ALIGN);
 
 	if (!read)
 		for (i = 0; i < count; i++)
@@ -238,10 +223,6 @@ static int enetc_cmd_rss_table(struct enetc_si *si, u32 *table, int count,
 	/* fill up the descriptor */
 	cbd.cmd = read ? 2 : 1;
 	cbd.cls = 3;
-	cbd.length = cpu_to_le16(count);
-
-	cbd.addr[0] = cpu_to_le32(lower_32_bits(dma_align));
-	cbd.addr[1] = cpu_to_le32(upper_32_bits(dma_align));
 
 	err = enetc_send_cmd(si, &cbd);
 	if (err)
@@ -251,7 +232,7 @@ static int enetc_cmd_rss_table(struct enetc_si *si, u32 *table, int count,
 		for (i = 0; i < count; i++)
 			table[i] = tmp_align[i];
 
-	dma_free_coherent(ring->dma_dev, count + RSSE_ALIGN, tmp, dma);
+	enetc_cbd_free_data_mem(si, count, tmp, &dma);
 
 	return err;
 }