net: macb: introduce DMA descriptor helpers (is 64bit? is PTP?)

Introduce macb_dma64() and macb_dma_ptp() helper functions.
Many codepaths are made simpler by dropping conditional compilation.

This implies two additional changes:
 - Always compile related structure definitions inside <macb.h>.
 - MACB_EXT_DESC can be dropped as it is useless now.

The common case:

	#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
		struct macb_dma_desc_64 *desc_64;
		if (bp->hw_dma_cap & HW_DMA_CAP_64B) {
			desc_64 = macb_64b_desc(bp, desc);
			// ...
		}
	#endif

Is replaced by:

	if (macb_dma64(bp)) {
		struct macb_dma_desc_64 *desc_64 = macb_64b_desc(bp, desc);
		// ...
	}

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
Link: https://patch.msgid.link/20251014-macb-cleanup-v1-9-31cd266e22cd@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 16 insertions, 39 deletions

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 44b96bf53ff6..9db419b94d0b 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -123,35 +123,24 @@ static unsigned int macb_dma_desc_get_size(struct macb *bp)
 {
 	unsigned int desc_size = sizeof(struct macb_dma_desc);
 
-#ifdef MACB_EXT_DESC
-	if (bp->caps & MACB_CAPS_DMA_64B)
+	if (macb_dma64(bp))
 		desc_size += sizeof(struct macb_dma_desc_64);
-	if (bp->caps & MACB_CAPS_DMA_PTP)
+	if (macb_dma_ptp(bp))
 		desc_size += sizeof(struct macb_dma_desc_ptp);
-#endif
 
 	return desc_size;
 }
 
 static unsigned int macb_adj_dma_desc_idx(struct macb *bp, unsigned int desc_idx)
 {
-#ifdef MACB_EXT_DESC
-	bool is_ptp = bp->caps & MACB_CAPS_DMA_PTP;
-	bool is_64b = bp->caps & MACB_CAPS_DMA_64B;
-
-	return desc_idx * (1 + is_64b + is_ptp);
-#else
-	return desc_idx;
-#endif
+	return desc_idx * (1 + macb_dma64(bp) + macb_dma_ptp(bp));
 }
 
-#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
 static struct macb_dma_desc_64 *macb_64b_desc(struct macb *bp, struct macb_dma_desc *desc)
 {
 	return (struct macb_dma_desc_64 *)((void *)desc
 		+ sizeof(struct macb_dma_desc));
 }
-#endif
 
 /* Ring buffer accessors */
 static unsigned int macb_tx_ring_wrap(struct macb *bp, unsigned int index)
@@ -473,15 +462,13 @@ static void macb_init_buffers(struct macb *bp)
 	struct macb_queue *queue;
 	unsigned int q;
 
-#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
 	/* Single register for all queues' high 32 bits. */
-	if (bp->caps & MACB_CAPS_DMA_64B) {
+	if (macb_dma64(bp)) {
 		macb_writel(bp, RBQPH,
 			    upper_32_bits(bp->queues[0].rx_ring_dma));
 		macb_writel(bp, TBQPH,
 			    upper_32_bits(bp->queues[0].tx_ring_dma));
 	}
-#endif
 
 	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
 		queue_writel(queue, RBQP, lower_32_bits(queue->rx_ring_dma));
@@ -1006,10 +993,9 @@ static void macb_tx_unmap(struct macb *bp, struct macb_tx_skb *tx_skb, int budge
 
 static void macb_set_addr(struct macb *bp, struct macb_dma_desc *desc, dma_addr_t addr)
 {
-#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
-	struct macb_dma_desc_64 *desc_64;
+	if (macb_dma64(bp)) {
+		struct macb_dma_desc_64 *desc_64;
 
-	if (bp->caps & MACB_CAPS_DMA_64B) {
 		desc_64 = macb_64b_desc(bp, desc);
 		desc_64->addrh = upper_32_bits(addr);
 		/* The low bits of RX address contain the RX_USED bit, clearing
@@ -1018,26 +1004,23 @@ static void macb_set_addr(struct macb *bp, struct macb_dma_desc *desc, dma_addr_
 		 */
 		dma_wmb();
 	}
-#endif
+
 	desc->addr = lower_32_bits(addr);
 }
 
 static dma_addr_t macb_get_addr(struct macb *bp, struct macb_dma_desc *desc)
 {
 	dma_addr_t addr = 0;
-#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
-	struct macb_dma_desc_64 *desc_64;
 
-	if (bp->caps & MACB_CAPS_DMA_64B) {
+	if (macb_dma64(bp)) {
+		struct macb_dma_desc_64 *desc_64;
+
 		desc_64 = macb_64b_desc(bp, desc);
 		addr = ((u64)(desc_64->addrh) << 32);
 	}
-#endif
 	addr |= MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, desc->addr));
-#ifdef CONFIG_MACB_USE_HWSTAMP
-	if (bp->caps & MACB_CAPS_DMA_PTP)
+	if (macb_dma_ptp(bp))
 		addr &= ~GEM_BIT(DMA_RXVALID);
-#endif
 	return addr;
 }
 
@@ -2299,11 +2282,9 @@ static netdev_tx_t macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		return ret;
 	}
 
-#ifdef CONFIG_MACB_USE_HWSTAMP
-	if ((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
-	    (bp->caps & MACB_CAPS_DMA_PTP))
+	if (macb_dma_ptp(bp) &&
+	    (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
 		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
-#endif
 
 	is_lso = (skb_shinfo(skb)->gso_size != 0);
 
@@ -2780,14 +2761,10 @@ static void macb_configure_dma(struct macb *bp)
 			dmacfg &= ~GEM_BIT(TXCOEN);
 
 		dmacfg &= ~GEM_BIT(ADDR64);
-#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
-		if (bp->caps & MACB_CAPS_DMA_64B)
+		if (macb_dma64(bp))
 			dmacfg |= GEM_BIT(ADDR64);
-#endif
-#ifdef CONFIG_MACB_USE_HWSTAMP
-		if (bp->caps & MACB_CAPS_DMA_PTP)
+		if (macb_dma_ptp(bp))
 			dmacfg |= GEM_BIT(RXEXT) | GEM_BIT(TXEXT);
-#endif
 		netdev_dbg(bp->dev, "Cadence configure DMA with 0x%08x\n",
 			   dmacfg);
 		gem_writel(bp, DMACFG, dmacfg);
@@ -3563,7 +3540,7 @@ static int gem_get_ts_info(struct net_device *dev,
 {
 	struct macb *bp = netdev_priv(dev);
 
-	if (!(bp->caps & MACB_CAPS_DMA_PTP)) {
+	if (!macb_dma_ptp(bp)) {
 		ethtool_op_get_ts_info(dev, info);
 		return 0;
 	}