[PATCH v4 2/3] net: ethernet: ti: Add desc_infos member to struct k3_cppi_desc_pool

Julien Panis
2024-03-12T13:22:56Z

This patch introduces a member and the related accessors which can be
used to store descriptor specific additional information. This member
can store, for instance, an ID to differentiate a skb TX buffer type
from a xdpf TX buffer type.

Signed-off-by: Julien Panis <jpanis@baylibre.com>
---
drivers/net/ethernet/ti/k3-cppi-desc-pool.c | 24 ++++++++++++++++++++++++
drivers/net/ethernet/ti/k3-cppi-desc-pool.h | 2 ++
2 files changed, 26 insertions(+)

diff --git a/drivers/net/ethernet/ti/k3-cppi-desc-pool.c b/drivers/net/ethernet/ti/k3-cppi-desc-pool.c
index fe8203c05731..d0c68d722ef2 100644
--- a/drivers/net/ethernet/ti/k3-cppi-desc-pool.c
+++ b/drivers/net/ethernet/ti/k3-cppi-desc-pool.c
@@ -22,6 +22,7 @@ struct k3_cppi_desc_pool {
size_t mem_size;
size_t num_desc;
struct gen_pool *gen_pool;
+ void **desc_infos;
};

void k3_cppi_desc_pool_destroy(struct k3_cppi_desc_pool *pool)
@@ -72,6 +73,15 @@ k3_cppi_desc_pool_create_name(struct device *dev, size_t size,
goto gen_pool_create_fail;
}

+ pool->desc_infos = devm_kcalloc(dev, pool->num_desc,
+ sizeof(*pool->desc_infos), GFP_KERNEL);
+ if (!pool->desc_infos) {
+ ret = -ENOMEM;
+ dev_err(pool->dev, "pool descriptor infos alloc failed %d\n", ret);
+ kfree_const(pool_name);
+ goto gen_pool_desc_infos_alloc_fail;
+ }
+
pool->gen_pool->name = pool_name;

pool->cpumem = dma_alloc_coherent(pool->dev, pool->mem_size,
@@ -94,6 +104,8 @@ k3_cppi_desc_pool_create_name(struct device *dev, size_t size,
dma_free_coherent(pool->dev, pool->mem_size, pool->cpumem,
pool->dma_addr);
dma_alloc_fail:
+ devm_kfree(pool->dev, pool->desc_infos);
+gen_pool_desc_infos_alloc_fail:
gen_pool_destroy(pool->gen_pool); /* frees pool->name */
gen_pool_create_fail:
devm_kfree(pool->dev, pool);
@@ -144,5 +156,17 @@ void *k3_cppi_desc_pool_cpuaddr(struct k3_cppi_desc_pool *pool)
}
EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_cpuaddr);

+void k3_cppi_desc_pool_desc_info_set(struct k3_cppi_desc_pool *pool, int desc_idx, void *info)
+{
+ pool->desc_infos[desc_idx] = info;
+}
+EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_desc_info_set);
+
+void *k3_cppi_desc_pool_desc_info(struct k3_cppi_desc_pool *pool, int desc_idx)
+{
+ return pool->desc_infos[desc_idx];
+}
+EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_desc_info);
+
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("TI K3 CPPI5 descriptors pool API");
diff --git a/drivers/net/ethernet/ti/k3-cppi-desc-pool.h b/drivers/net/ethernet/ti/k3-cppi-desc-pool.h
index 149d5579a5e2..0076596307e7 100644
--- a/drivers/net/ethernet/ti/k3-cppi-desc-pool.h
+++ b/drivers/net/ethernet/ti/k3-cppi-desc-pool.h
@@ -28,5 +28,7 @@ void k3_cppi_desc_pool_free(struct k3_cppi_desc_pool *pool, void *addr);
size_t k3_cppi_desc_pool_avail(struct k3_cppi_desc_pool *pool);
size_t k3_cppi_desc_pool_desc_size(struct k3_cppi_desc_pool *pool);
void *k3_cppi_desc_pool_cpuaddr(struct k3_cppi_desc_pool *pool);
+void k3_cppi_desc_pool_desc_info_set(struct k3_cppi_desc_pool *pool, int desc_idx, void *info);
+void *k3_cppi_desc_pool_desc_info(struct k3_cppi_desc_pool *pool, int desc_idx);

#endif /* K3_CPPI_DESC_POOL_H_ */

--
2.37.3