net: airoha: Do not store hfwd references in airoha_qdma struct

Since hfwd descriptor and buffer queues are allocated via
dmam_alloc_coherent() we do not need to store their references
in airoha_qdma struct. This patch does not introduce any logical changes,
just code clean-up.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250521-airopha-desc-sram-v3-2-a6e9b085b4f0@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Author: LorenzoBianconi

drivers/net/ethernet/airoha/airoha_eth.c

@@ -1077,17 +1077,13 @@ static int airoha_qdma_init_hfwd_queues(struct airoha_qdma *qdma)
 	int size;
 
 	size = HW_DSCP_NUM * sizeof(struct airoha_qdma_fwd_desc);
-	qdma->hfwd.desc = dmam_alloc_coherent(eth->dev, size, &dma_addr,
-					      GFP_KERNEL);
-	if (!qdma->hfwd.desc)
+	if (!dmam_alloc_coherent(eth->dev, size, &dma_addr, GFP_KERNEL))
 		return -ENOMEM;
 
 	airoha_qdma_wr(qdma, REG_FWD_DSCP_BASE, dma_addr);
 
 	size = AIROHA_MAX_PACKET_SIZE * HW_DSCP_NUM;
-	qdma->hfwd.q = dmam_alloc_coherent(eth->dev, size, &dma_addr,
-					   GFP_KERNEL);
-	if (!qdma->hfwd.q)
+	if (!dmam_alloc_coherent(eth->dev, size, &dma_addr, GFP_KERNEL))
 		return -ENOMEM;
 
 	airoha_qdma_wr(qdma, REG_FWD_BUF_BASE, dma_addr);

drivers/net/ethernet/airoha/airoha_eth.h

@@ -513,12 +513,6 @@ struct airoha_qdma {
 
 	struct airoha_queue q_tx[AIROHA_NUM_TX_RING];
 	struct airoha_queue q_rx[AIROHA_NUM_RX_RING];
-
-	/* descriptor and packet buffers for qdma hw forward */
-	struct {
-		void *desc;
-		void *q;
-	} hfwd;
 };
 
 struct airoha_gdm_port {