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From: Julien Panis <jpanis@baylibre.com>
Date: Fri, 12 Apr 2024 17:38:33 +0200
Subject: [PATCH net-next v9 2/3] net: ethernet: ti: Add desc_infos member
 to struct k3_cppi_desc_pool
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Message-Id: <20240223-am65-cpsw-xdp-basic-v9-2-2c194217e325@baylibre.com>
References: <20240223-am65-cpsw-xdp-basic-v9-0-2c194217e325@baylibre.com>
In-Reply-To: <20240223-am65-cpsw-xdp-basic-v9-0-2c194217e325@baylibre.com>
To: "David S. Miller" <davem@davemloft.net>, 
 Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, 
 Paolo Abeni <pabeni@redhat.com>, Russell King <linux@armlinux.org.uk>, 
 Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>, 
 Jesper Dangaard Brouer <hawk@kernel.org>, 
 John Fastabend <john.fastabend@gmail.com>, 
 Sumit Semwal <sumit.semwal@linaro.org>, 
 =?utf-8?q?Christian_K=C3=B6nig?= <christian.koenig@amd.com>, 
 Simon Horman <horms@kernel.org>, Andrew Lunn <andrew@lunn.ch>, 
 Ratheesh Kannoth <rkannoth@marvell.com>, 
 Naveen Mamindlapalli <naveenm@marvell.com>, 
 Jacob Keller <jacob.e.keller@intel.com>
Cc: danishanwar@ti.com, yuehaibing@huawei.com, rogerq@kernel.org, 
 netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, 
 linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, 
 linaro-mm-sig@lists.linaro.org, Julien Panis <jpanis@baylibre.com>

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 | 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