Merge branch 'cpsw-xdp'

Julien Panis says:

====================
Add minimal XDP support to TI AM65 CPSW Ethernet driver

This patch adds XDP support to TI AM65 CPSW Ethernet driver.

The following features are implemented: NETDEV_XDP_ACT_BASIC,
NETDEV_XDP_ACT_REDIRECT, and NETDEV_XDP_ACT_NDO_XMIT.

Zero-copy and non-linear XDP buffer supports are NOT implemented.

Besides, the page pool memory model is used to get better performance.
====================
Signed-off-by: Julien Panis <jpanis@baylibre.com>

drivers/net/ethernet/ti/am65-cpsw-nuss.h

@@ -14,6 +14,7 @@
 #include <linux/platform_device.h>
 #include <linux/soc/ti/k3-ringacc.h>
 #include <net/devlink.h>
+#include <net/xdp.h>
 #include "am65-cpsw-qos.h"
 
 struct am65_cpts;
@@ -56,10 +57,18 @@ struct am65_cpsw_port {
 	bool				rx_ts_enabled;
 	struct am65_cpsw_qos		qos;
 	struct devlink_port		devlink_port;
+	struct bpf_prog			*xdp_prog;
+	struct xdp_rxq_info		xdp_rxq;
 	/* Only for suspend resume context */
 	u32				vid_context;
 };
 
+enum am65_cpsw_tx_buf_type {
+	AM65_CPSW_TX_BUF_TYPE_SKB,
+	AM65_CPSW_TX_BUF_TYPE_XDP_TX,
+	AM65_CPSW_TX_BUF_TYPE_XDP_NDO,
+};
+
 struct am65_cpsw_host {
 	struct am65_cpsw_common		*common;
 	void __iomem			*port_base;
@@ -80,6 +89,7 @@ struct am65_cpsw_tx_chn {
 	int irq;
 	u32 id;
 	u32 descs_num;
+	unsigned char dsize_log2;
 	char tx_chn_name[128];
 	u32 rate_mbps;
 };
@@ -89,7 +99,10 @@ struct am65_cpsw_rx_chn {
 	struct device *dma_dev;
 	struct k3_cppi_desc_pool *desc_pool;
 	struct k3_udma_glue_rx_channel *rx_chn;
+	struct page_pool *page_pool;
+	struct page **pages;
 	u32 descs_num;
+	unsigned char dsize_log2;
 	int irq;
 };
 

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);
@@ -132,5 +142,31 @@ size_t k3_cppi_desc_pool_avail(struct k3_cppi_desc_pool *pool)
 }
 EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_avail);
 
+size_t k3_cppi_desc_pool_desc_size(const struct k3_cppi_desc_pool *pool)
+{
+	return pool->desc_size;
+}
+EXPORT_SYMBOL_GPL(k3_cppi_desc_pool_desc_size);
+
+void *k3_cppi_desc_pool_cpuaddr(const struct k3_cppi_desc_pool *pool)
+{
+	return pool->cpumem;
+}
+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");

drivers/net/ethernet/ti/k3-cppi-desc-pool.h

@@ -26,5 +26,11 @@ k3_cppi_desc_pool_dma2virt(struct k3_cppi_desc_pool *pool, dma_addr_t dma);
 void *k3_cppi_desc_pool_alloc(struct k3_cppi_desc_pool *pool);
 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_ */