netdev - [PATCH v3 2/3] net: ethernet: ti: Add desc_infos member to struct k3_cppi_desc

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Message-Id: <20240223-am65-cpsw-xdp-basic-v3-2-5d944a9d84a0@baylibre.com>
Date: Tue, 05 Mar 2024 12:08:19 +0100
From: Julien Panis <jpanis@...libre.com>
To: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Russell King <linux@...linux.org.uk>, 
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
 Jesper Dangaard Brouer <hawk@...nel.org>, 
 John Fastabend <john.fastabend@...il.com>, 
 Sumit Semwal <sumit.semwal@...aro.org>, 
 Christian König <christian.koenig@....com>, 
 Simon Horman <horms@...nel.org>, Andrew Lunn <andrew@...n.ch>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 bpf@...r.kernel.org, linux-media@...r.kernel.org, 
 dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org, 
 Julien Panis <jpanis@...libre.com>
Subject: [PATCH v3 2/3] net: ethernet: ti: Add desc_infos member to struct
 k3_cppi_desc_pool

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@...libre.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