Commit 3a1ce9e3 authored by Lorenzo Bianconi's avatar Lorenzo Bianconi Committed by Paolo Abeni
Browse files

net: airoha: Add the capability to allocate hwfd buffers via reserved-memory 



In some configurations QDMA blocks require a contiguous block of
system memory for hwfd buffers queue. Introduce the capability to allocate
hw buffers forwarding queue via the reserved-memory DTS property instead of
running dmam_alloc_coherent().

Signed-off-by: default avatarLorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: default avatarSimon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250521-airopha-desc-sram-v3-3-a6e9b085b4f0@kernel.org


Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
parent 09aa788f

drivers/net/ethernet/airoha/airoha_eth.c

+30 −3
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
 */

#include <linux/of.h>

#include <linux/of_net.h>

#include <linux/of_reserved_mem.h>

#include <linux/platform_device.h>

#include <linux/tcp.h>

#include <linux/u64_stats_sync.h>
@@ -1072,9 +1073,11 @@ static void airoha_qdma_cleanup_tx_queue(struct airoha_queue *q) 
static int airoha_qdma_init_hfwd_queues(struct airoha_qdma *qdma)

{

	struct airoha_eth *eth = qdma->eth;

	int id = qdma - &eth->qdma[0];

	dma_addr_t dma_addr;

	const char *name;

	int size, index;

	u32 status;

	int size;



	size = HW_DSCP_NUM * sizeof(struct airoha_qdma_fwd_desc);

	if (!dmam_alloc_coherent(eth->dev, size, &dma_addr, GFP_KERNEL))
@@ -1082,9 +1085,33 @@ static int airoha_qdma_init_hfwd_queues(struct airoha_qdma *qdma) 


	airoha_qdma_wr(qdma, REG_FWD_DSCP_BASE, dma_addr);



	name = devm_kasprintf(eth->dev, GFP_KERNEL, "qdma%d-buf", id);

	if (!name)

		return -ENOMEM;



	index = of_property_match_string(eth->dev->of_node,

					 "memory-region-names", name);

	if (index >= 0) {

		struct reserved_mem *rmem;

		struct device_node *np;



		/* Consume reserved memory for hw forwarding buffers queue if

		 * available in the DTS

		 */

		np = of_parse_phandle(eth->dev->of_node, "memory-region",

				      index);

		if (!np)

			return -ENODEV;



		rmem = of_reserved_mem_lookup(np);

		of_node_put(np);

		dma_addr = rmem->base;

	} else {

		size = AIROHA_MAX_PACKET_SIZE * HW_DSCP_NUM;

	if (!dmam_alloc_coherent(eth->dev, size, &dma_addr, GFP_KERNEL))

		if (!dmam_alloc_coherent(eth->dev, size, &dma_addr,

					 GFP_KERNEL))

			return -ENOMEM;

	}



	airoha_qdma_wr(qdma, REG_FWD_BUF_BASE, dma_addr);