Commit 8acacc40 authored by Julien Panis's avatar Julien Panis Committed by David S. Miller
Browse files

net: ethernet: ti: am65-cpsw: Add minimal XDP support 



This patch adds XDP (eXpress Data Path) support to TI AM65 CPSW
Ethernet driver. The following features are implemented:
- NETDEV_XDP_ACT_BASIC (XDP_PASS, XDP_TX, XDP_DROP, XDP_ABORTED)
- NETDEV_XDP_ACT_REDIRECT (XDP_REDIRECT)
- NETDEV_XDP_ACT_NDO_XMIT (ndo_xdp_xmit callback)

The page pool memory model is used to get better performance.
Below are benchmark results obtained for the receiver with iperf3 default
parameters:
- Without page pool: 495 Mbits/sec
- With page pool: 605 Mbits/sec (actually 610 Mbits/sec, with a 5 Mbits/sec
loss due to extra processing in the hot path to handle XDP).

Signed-off-by: default avatarJulien Panis <jpanis@baylibre.com>
Reviewed-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 84d767a3

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

+563 −96

File changed.

Preview size limit exceeded, changes collapsed.

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

+13 −0
Original line number Diff line number Diff line
@@ -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;

};