[PATCH net-next v9 2/3] net: ethernet: ti: Add desc_infos member to struct k3_cppi_desc_pool

[Julien Panis]

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 <jpa...@baylibre.com>
---
 drivers/net/ethernet/ti/k3-cppi-desc-pool.c | 34 ++++++++++++++++++++++++-----
 drivers/net/ethernet/ti/k3-cppi-desc-pool.h |  4 ++++
 2 files changed, 33 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/ti/k3-cppi-desc-pool.c 
b/drivers/net/ethernet/ti/k3-cppi-desc-pool.c
index 414bcac9dcc6..739bae8e11ee 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)
@@ -37,7 +38,11 @@ void k3_cppi_desc_pool_destroy(struct k3_cppi_desc_pool 
*pool)
                dma_free_coherent(pool->dev, pool->mem_size, pool->cpumem,
                                  pool->dma_addr);
 
+       kfree(pool->desc_infos);
+
        gen_pool_destroy(pool->gen_pool);       /* frees pool->name */
+
+       kfree(pool);
 }
 EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_destroy);
 
@@ -50,7 +55,7 @@ k3_cppi_desc_pool_create_name(struct device *dev, size_t size,
        const char *pool_name = NULL;
        int ret = -ENOMEM;
 
-       pool = devm_kzalloc(dev, sizeof(*pool), GFP_KERNEL);
+       pool = kzalloc(sizeof(*pool), GFP_KERNEL);
        if (!pool)
                return ERR_PTR(ret);
 
@@ -62,18 +67,21 @@ k3_cppi_desc_pool_create_name(struct device *dev, size_t 
size,
        pool_name = kstrdup_const(name ? name : dev_name(pool->dev),
                                  GFP_KERNEL);
        if (!pool_name)
-               return ERR_PTR(-ENOMEM);
+               goto gen_pool_create_fail;
 
        pool->gen_pool = gen_pool_create(ilog2(pool->desc_size), -1);
        if (!pool->gen_pool) {
-               ret = -ENOMEM;
-               dev_err(pool->dev, "pool create failed %d\n", ret);
                kfree_const(pool_name);
                goto gen_pool_create_fail;
        }
 
        pool->gen_pool->name = pool_name;
 
+       pool->desc_infos = kcalloc(pool->num_desc,
+                                  sizeof(*pool->desc_infos), GFP_KERNEL);
+       if (!pool->desc_infos)
+               goto gen_pool_desc_infos_alloc_fail;
+
        pool->cpumem = dma_alloc_coherent(pool->dev, pool->mem_size,
                                          &pool->dma_addr, GFP_KERNEL);
 
@@ -94,9 +102,11 @@ 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:
+       kfree(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);
+       kfree(pool);
        return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_create_name);
@@ -144,5 +154,19 @@ void *k3_cppi_desc_pool_cpuaddr(const 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(const 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 3c6aed0bed71..851d352b338b 100644
--- a/drivers/net/ethernet/ti/k3-cppi-desc-pool.h
+++ b/drivers/net/ethernet/ti/k3-cppi-desc-pool.h
@@ -28,5 +28,9 @@ 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(const struct k3_cppi_desc_pool *pool);
 void *k3_cppi_desc_pool_cpuaddr(const 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(const struct k3_cppi_desc_pool *pool,
+                                 int desc_idx);
 
 #endif /* K3_CPPI_DESC_POOL_H_ */

-- 
2.37.3