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

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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: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250521-airopha-desc-sram-v3-3-a6e9b085b4f0@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Lorenzo Bianconi 2025-05-21 09:16:38 +02:00 committed by Paolo Abeni
parent 09aa788f98
commit 3a1ce9e3d0
1 changed files with 30 additions and 3 deletions
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33
drivers/net/ethernet/airoha/airoha_eth.c
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@ -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))
@ -1082,10 +1085,34 @@ static int airoha_qdma_init_hfwd_queues(struct airoha_qdma *qdma)
airoha_qdma_wr(qdma, REG_FWD_DSCP_BASE, dma_addr);
size = AIROHA_MAX_PACKET_SIZE * HW_DSCP_NUM;
if (!dmam_alloc_coherent(eth->dev, size, &dma_addr, GFP_KERNEL))
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))
return -ENOMEM;
}
airoha_qdma_wr(qdma, REG_FWD_BUF_BASE, dma_addr);
airoha_qdma_rmw(qdma, REG_HW_FWD_DSCP_CFG,