[PATCH v4 3/3] net: ethernet: ti: am65-cpsw: Add minimal XDP support

Julien Panis
2024-03-12T13:22:58Z

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: 505 Mbits/sec (actually 510 Mbits/sec, with a 5 Mbits/sec
loss due to extra processing in the hot path to handle XDP).

Signed-off-by: Julien Panis <jpanis@baylibre.com>
---
drivers/net/ethernet/ti/am65-cpsw-nuss.c | 536 ++++++++++++++++++++++++++++---
drivers/net/ethernet/ti/am65-cpsw-nuss.h | 13 +
2 files changed, 499 insertions(+), 50 deletions(-)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 9d2f4ac783e4..67239c35d346 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -5,6 +5,7 @@
*
*/

+#include <linux/bpf_trace.h>
#include <linux/clk.h>
#include <linux/etherdevice.h>
#include <linux/if_vlan.h>
@@ -30,6 +31,7 @@
#include <linux/sys_soc.h>
#include <linux/dma/ti-cppi5.h>
#include <linux/dma/k3-udma-glue.h>
+#include <net/page_pool/helpers.h>
#include <net/switchdev.h>

#include "cpsw_ale.h"
@@ -138,6 +140,17 @@

#define AM65_CPSW_DEFAULT_TX_CHNS 8

+/* CPPI streaming packet interface */
+#define AM65_CPSW_CPPI_TX_FLOW_ID 0x3FFF
+#define AM65_CPSW_CPPI_TX_PKT_TYPE 0x7
+
+/* XDP */
+#define AM65_CPSW_XDP_CONSUMED 1
+#define AM65_CPSW_XDP_PASS 0
+
+/* Include headroom compatible with both skb and xdpf */
+#define AM65_CPSW_HEADROOM max(NET_SKB_PAD, XDP_PACKET_HEADROOM)
+
static void am65_cpsw_port_set_sl_mac(struct am65_cpsw_port *slave,
const u8 *dev_addr)
{
@@ -369,6 +382,66 @@ static void am65_cpsw_init_host_port_emac(struct am65_cpsw_common *common);
static void am65_cpsw_init_port_switch_ale(struct am65_cpsw_port *port);
static void am65_cpsw_init_port_emac_ale(struct am65_cpsw_port *port);

+static void am65_cpsw_destroy_xdp_rxqs(struct am65_cpsw_common *common)
+{
+ struct am65_cpsw_rx_chn *rx_chn = &common->rx_chns;
+ struct xdp_rxq_info *rxq;
+ int i;
+
+ for (i = 0; i < common->port_num; i++) {
+ rxq = &common->ports[i].xdp_rxq;
+
+ if (xdp_rxq_info_is_reg(rxq))
+ xdp_rxq_info_unreg(rxq);
+ }
+
+ if (rx_chn->page_pool) {
+ page_pool_destroy(rx_chn->page_pool);
+ rx_chn->page_pool = NULL;
+ }
+}
+
+static int am65_cpsw_create_xdp_rxqs(struct am65_cpsw_common *common)
+{
+ struct am65_cpsw_rx_chn *rx_chn = &common->rx_chns;
+ struct page_pool_params pp_params = {
+ .flags = PP_FLAG_DMA_MAP,
+ .order = 0,
+ .pool_size = AM65_CPSW_MAX_RX_DESC,
+ .nid = dev_to_node(common->dev),
+ .dev = common->dev,
+ .dma_dir = DMA_BIDIRECTIONAL,
+ .napi = &common->napi_rx,
+ };
+ struct xdp_rxq_info *rxq;
+ struct page_pool *pool;
+ int i, ret;
+
+ pool = page_pool_create(&pp_params);
+ if (IS_ERR(pool))
+ return PTR_ERR(pool);
+
+ rx_chn->page_pool = pool;
+
+ for (i = 0; i < common->port_num; i++) {
+ rxq = &common->ports[i].xdp_rxq;
+
+ ret = xdp_rxq_info_reg(rxq, common->ports[i].ndev, i, 0);
+ if (ret)
+ goto err;
+
+ ret = xdp_rxq_info_reg_mem_model(rxq, MEM_TYPE_PAGE_POOL, pool);
+ if (ret)
+ goto err;
+ }
+
+ return 0;
+
+err:
+ am65_cpsw_destroy_xdp_rxqs(common);
+ return ret;
+}
+
static void am65_cpsw_nuss_rx_cleanup(void *data, dma_addr_t desc_dma)
{
struct am65_cpsw_rx_chn *rx_chn = data;
@@ -440,9 +513,40 @@ static void am65_cpsw_nuss_tx_cleanup(void *data, dma_addr_t desc_dma)
dev_kfree_skb_any(skb);
}

+static struct sk_buff *am65_cpsw_alloc_skb(struct am65_cpsw_rx_chn *rx_chn,
+ struct net_device *ndev,
+ unsigned int len,
+ int desc_idx)
+{
+ struct sk_buff *skb;
+ struct page *page;
+
+ page = page_pool_dev_alloc_pages(rx_chn->page_pool);
+ if (unlikely(!page))
+ return NULL;
+
+ len += AM65_CPSW_HEADROOM;
+
+ skb = build_skb(page_address(page), len);
+ if (unlikely(!skb)) {
+ page_pool_put_full_page(rx_chn->page_pool, page, ndev);
+ rx_chn->pages[desc_idx] = NULL;
+ return NULL;
+ }
+
+ skb_reserve(skb, AM65_CPSW_HEADROOM + NET_IP_ALIGN);
+ skb->dev = ndev;
+
+ rx_chn->pages[desc_idx] = page;
+
+ return skb;
+}
+
static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
{
struct am65_cpsw_host *host_p = am65_common_get_host(common);
+ struct am65_cpsw_rx_chn *rx_chn = &common->rx_chns;
+ struct am65_cpsw_tx_chn *tx_chn = common->tx_chns;
int port_idx, i, ret, tx;
struct sk_buff *skb;
u32 val, port_mask;
@@ -505,10 +609,14 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)

am65_cpsw_qos_tx_p0_rate_init(common);

- for (i = 0; i < common->rx_chns.descs_num; i++) {
- skb = __netdev_alloc_skb_ip_align(NULL,
- AM65_CPSW_MAX_PACKET_SIZE,
- GFP_KERNEL);
+ ret = am65_cpsw_create_xdp_rxqs(common);
+ if (ret) {
+ dev_err(common->dev, "Failed to create XDP rx queues\n");
+ return ret;
+ }
+
+ for (i = 0; i < rx_chn->descs_num; i++) {
+ skb = am65_cpsw_alloc_skb(rx_chn, NULL, AM65_CPSW_MAX_PACKET_SIZE, i);
if (!skb) {
ret = -ENOMEM;
dev_err(common->dev, "cannot allocate skb\n");
@@ -531,27 +639,27 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
}
}

- ret = k3_udma_glue_enable_rx_chn(common->rx_chns.rx_chn);
+ ret = k3_udma_glue_enable_rx_chn(rx_chn->rx_chn);
if (ret) {
dev_err(common->dev, "couldn't enable rx chn: %d\n", ret);
goto fail_rx;
}

for (tx = 0; tx < common->tx_ch_num; tx++) {
- ret = k3_udma_glue_enable_tx_chn(common->tx_chns[tx].tx_chn);
+ ret = k3_udma_glue_enable_tx_chn(tx_chn[tx].tx_chn);
if (ret) {
dev_err(common->dev, "couldn't enable tx chn %d: %d\n",
tx, ret);
tx--;
goto fail_tx;
}
- napi_enable(&common->tx_chns[tx].napi_tx);
+ napi_enable(&tx_chn[tx].napi_tx);
}

napi_enable(&common->napi_rx);
if (common->rx_irq_disabled) {
common->rx_irq_disabled = false;
- enable_irq(common->rx_chns.irq);
+ enable_irq(rx_chn->irq);
}

dev_dbg(common->dev, "cpsw_nuss started\n");
@@ -559,22 +667,23 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)

fail_tx:
while (tx >= 0) {
- napi_disable(&common->tx_chns[tx].napi_tx);
- k3_udma_glue_disable_tx_chn(common->tx_chns[tx].tx_chn);
+ napi_disable(&tx_chn[tx].napi_tx);
+ k3_udma_glue_disable_tx_chn(tx_chn[tx].tx_chn);
tx--;
}

- k3_udma_glue_disable_rx_chn(common->rx_chns.rx_chn);
+ k3_udma_glue_disable_rx_chn(rx_chn->rx_chn);

fail_rx:
- k3_udma_glue_reset_rx_chn(common->rx_chns.rx_chn, 0,
- &common->rx_chns,
+ k3_udma_glue_reset_rx_chn(rx_chn->rx_chn, 0, rx_chn,
am65_cpsw_nuss_rx_cleanup, 0);
return ret;
}

static int am65_cpsw_nuss_common_stop(struct am65_cpsw_common *common)
{
+ struct am65_cpsw_rx_chn *rx_chn = &common->rx_chns;
+ struct am65_cpsw_tx_chn *tx_chn = common->tx_chns;
int i;

if (common->usage_count != 1)
@@ -590,26 +699,25 @@ static int am65_cpsw_nuss_common_stop(struct am65_cpsw_common *common)
reinit_completion(&common->tdown_complete);

for (i = 0; i < common->tx_ch_num; i++)
- k3_udma_glue_tdown_tx_chn(common->tx_chns[i].tx_chn, false);
+ k3_udma_glue_tdown_tx_chn(tx_chn[i].tx_chn, false);

i = wait_for_completion_timeout(&common->tdown_complete,
msecs_to_jiffies(1000));
if (!i)
dev_err(common->dev, "tx timeout\n");
for (i = 0; i < common->tx_ch_num; i++) {
- napi_disable(&common->tx_chns[i].napi_tx);
- hrtimer_cancel(&common->tx_chns[i].tx_hrtimer);
+ napi_disable(&tx_chn[i].napi_tx);
+ hrtimer_cancel(&tx_chn[i].tx_hrtimer);
}

for (i = 0; i < common->tx_ch_num; i++) {
- k3_udma_glue_reset_tx_chn(common->tx_chns[i].tx_chn,
- &common->tx_chns[i],
+ k3_udma_glue_reset_tx_chn(tx_chn[i].tx_chn, &tx_chn[i],
am65_cpsw_nuss_tx_cleanup);
- k3_udma_glue_disable_tx_chn(common->tx_chns[i].tx_chn);
+ k3_udma_glue_disable_tx_chn(tx_chn[i].tx_chn);
}

reinit_completion(&common->tdown_complete);
- k3_udma_glue_tdown_rx_chn(common->rx_chns.rx_chn, true);
+ k3_udma_glue_tdown_rx_chn(rx_chn->rx_chn, true);

if (common->pdata.quirks & AM64_CPSW_QUIRK_DMA_RX_TDOWN_IRQ) {
i = wait_for_completion_timeout(&common->tdown_complete, msecs_to_jiffies(1000));
@@ -621,17 +729,24 @@ static int am65_cpsw_nuss_common_stop(struct am65_cpsw_common *common)
hrtimer_cancel(&common->rx_hrtimer);

for (i = 0; i < AM65_CPSW_MAX_RX_FLOWS; i++)
- k3_udma_glue_reset_rx_chn(common->rx_chns.rx_chn, i,
- &common->rx_chns,
+ k3_udma_glue_reset_rx_chn(rx_chn->rx_chn, i, rx_chn,
am65_cpsw_nuss_rx_cleanup, !!i);

- k3_udma_glue_disable_rx_chn(common->rx_chns.rx_chn);
+ k3_udma_glue_disable_rx_chn(rx_chn->rx_chn);

cpsw_ale_stop(common->ale);

writel(0, common->cpsw_base + AM65_CPSW_REG_CTL);
writel(0, common->cpsw_base + AM65_CPSW_REG_STAT_PORT_EN);

+ for (i = 0; i < rx_chn->descs_num; i++) {
+ if (rx_chn->pages[i]) {
+ page_pool_put_full_page(rx_chn->page_pool, rx_chn->pages[i], false);
+ rx_chn->pages[i] = NULL;
+ }
+ }
+ am65_cpsw_destroy_xdp_rxqs(common);
+
dev_dbg(common->dev, "cpsw_nuss stopped\n");
return 0;
}
@@ -749,6 +864,176 @@ static int am65_cpsw_nuss_ndo_slave_open(struct net_device *ndev)
return ret;
}

+static int am65_cpsw_nuss_desc_idx(struct k3_cppi_desc_pool *desc_pool, void *desc,
+ unsigned char dsize_log2)
+{
+ void *pool_addr = k3_cppi_desc_pool_cpuaddr(desc_pool);
+
+ return (desc - pool_addr) >> dsize_log2;
+}
+
+static void am65_cpsw_nuss_set_buf_type(struct am65_cpsw_tx_chn *tx_chn,
+ struct cppi5_host_desc_t *desc,
+ enum am65_cpsw_tx_buf_type buf_type)
+{
+ int desc_idx;
+
+ desc_idx = am65_cpsw_nuss_desc_idx(tx_chn->desc_pool, desc, tx_chn->dsize_log2);
+ k3_cppi_desc_pool_desc_info_set(tx_chn->desc_pool, desc_idx, (void *)buf_type);
+}
+
+static enum am65_cpsw_tx_buf_type am65_cpsw_nuss_buf_type(struct am65_cpsw_tx_chn *tx_chn,
+ dma_addr_t desc_dma)
+{
+ struct cppi5_host_desc_t *desc_tx;
+ int desc_idx;
+
+ desc_tx = k3_cppi_desc_pool_dma2virt(tx_chn->desc_pool, desc_dma);
+ desc_idx = am65_cpsw_nuss_desc_idx(tx_chn->desc_pool, desc_tx, tx_chn->dsize_log2);
+
+ return (enum am65_cpsw_tx_buf_type)k3_cppi_desc_pool_desc_info(tx_chn->desc_pool,
+ desc_idx);
+}
+
+static int am65_cpsw_xdp_tx_frame(struct net_device *ndev,
+ struct am65_cpsw_tx_chn *tx_chn,
+ struct xdp_frame *xdpf,
+ enum am65_cpsw_tx_buf_type buf_type)
+{
+ struct am65_cpsw_common *common = am65_ndev_to_common(ndev);
+ struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
+ struct cppi5_host_desc_t *host_desc;
+ struct netdev_queue *netif_txq;
+ dma_addr_t dma_desc, dma_buf;
+ u32 pkt_len = xdpf->len;
+ void **swdata;
+ int ret;
+
+ host_desc = k3_cppi_desc_pool_alloc(tx_chn->desc_pool);
+ if (unlikely(!host_desc)) {
+ ndev->stats.tx_dropped++;
+ return -ENOMEM;
+ }
+
+ am65_cpsw_nuss_set_buf_type(tx_chn, host_desc, buf_type);
+
+ dma_buf = dma_map_single(tx_chn->dma_dev, xdpf->data, pkt_len, DMA_TO_DEVICE);
+ if (unlikely(dma_mapping_error(tx_chn->dma_dev, dma_buf))) {
+ ndev->stats.tx_dropped++;
+ ret = -ENOMEM;
+ goto pool_free;
+ }
+
+ cppi5_hdesc_init(host_desc, CPPI5_INFO0_HDESC_EPIB_PRESENT, AM65_CPSW_NAV_PS_DATA_SIZE);
+ cppi5_hdesc_set_pkttype(host_desc, AM65_CPSW_CPPI_TX_PKT_TYPE);
+ cppi5_hdesc_set_pktlen(host_desc, pkt_len);
+ cppi5_desc_set_pktids(&host_desc->hdr, 0, AM65_CPSW_CPPI_TX_FLOW_ID);
+ cppi5_desc_set_tags_ids(&host_desc->hdr, 0, port->port_id);
+
+ k3_udma_glue_tx_dma_to_cppi5_addr(tx_chn->tx_chn, &dma_buf);
+ cppi5_hdesc_attach_buf(host_desc, dma_buf, pkt_len, dma_buf, pkt_len);
+
+ swdata = cppi5_hdesc_get_swdata(host_desc);
+ *(swdata) = xdpf;
+
+ /* Report BQL before sending the packet */
+ netif_txq = netdev_get_tx_queue(ndev, tx_chn->id);
+ netdev_tx_sent_queue(netif_txq, pkt_len);
+
+ dma_desc = k3_cppi_desc_pool_virt2dma(tx_chn->desc_pool, host_desc);
+ if (AM65_CPSW_IS_CPSW2G(common)) {
+ ret = k3_udma_glue_push_tx_chn(tx_chn->tx_chn, host_desc, dma_desc);
+ } else {
+ spin_lock_bh(&tx_chn->lock);
+ ret = k3_udma_glue_push_tx_chn(tx_chn->tx_chn, host_desc, dma_desc);
+ spin_unlock_bh(&tx_chn->lock);
+ }
+ if (ret) {
+ /* Inform BQL */
+ netdev_tx_completed_queue(netif_txq, 1, pkt_len);
+ ndev->stats.tx_errors++;
+ goto dma_unmap;
+ }
+
+ return 0;
+
+dma_unmap:
+ k3_udma_glue_tx_cppi5_to_dma_addr(tx_chn->tx_chn, &dma_buf);
+ dma_unmap_single(tx_chn->dma_dev, dma_buf, pkt_len, DMA_TO_DEVICE);
+pool_free:
+ k3_cppi_desc_pool_free(tx_chn->desc_pool, host_desc);
+ return ret;
+}
+
+static int am65_cpsw_run_xdp(struct am65_cpsw_common *common, struct am65_cpsw_port *port,
+ struct xdp_buff *xdp, int desc_idx, int cpu, int *len)
+{
+ struct am65_cpsw_rx_chn *rx_chn = &common->rx_chns;
+ struct net_device *ndev = port->ndev;
+ int ret = AM65_CPSW_XDP_CONSUMED;
+ struct am65_cpsw_tx_chn *tx_chn;
+ struct netdev_queue *netif_txq;
+ struct xdp_frame *xdpf;
+ struct bpf_prog *prog;
+ struct page *page;
+ u32 act;
+
+ prog = READ_ONCE(port->xdp_prog);
+ if (!prog)
+ return AM65_CPSW_XDP_PASS;
+
+ act = bpf_prog_run_xdp(prog, xdp);
+ /* XDP prog might have changed packet data and boundaries */
+ *len = xdp->data_end - xdp->data;
+
+ switch (act) {
+ case XDP_PASS:
+ ret = AM65_CPSW_XDP_PASS;
+ goto out;
+ case XDP_TX:
+ tx_chn = &common->tx_chns[cpu % AM65_CPSW_MAX_TX_QUEUES];
+ netif_txq = netdev_get_tx_queue(ndev, tx_chn->id);
+
+ xdpf = xdp_convert_buff_to_frame(xdp);
+ if (unlikely(!xdpf))
+ break;
+
+ __netif_tx_lock(netif_txq, cpu);
+ ret = am65_cpsw_xdp_tx_frame(ndev, tx_chn, xdpf,
+ AM65_CPSW_TX_BUF_TYPE_XDP_TX);
+ __netif_tx_unlock(netif_txq);
+ if (ret)
+ break;
+
+ ndev->stats.rx_bytes += *len;
+ ndev->stats.rx_packets++;
+ ret = AM65_CPSW_XDP_CONSUMED;
+ goto out;
+ case XDP_REDIRECT:
+ if (unlikely(xdp_do_redirect(ndev, xdp, prog)))
+ break;
+
+ xdp_do_flush();
+ ndev->stats.rx_bytes += *len;
+ ndev->stats.rx_packets++;
+ goto out;
+ default:
+ bpf_warn_invalid_xdp_action(ndev, prog, act);
+ fallthrough;
+ case XDP_ABORTED:
+ trace_xdp_exception(ndev, prog, act);
+ fallthrough;
+ case XDP_DROP:
+ ndev->stats.rx_dropped++;
+ }
+
+ page = virt_to_head_page(xdp->data);
+ page_pool_recycle_direct(rx_chn->page_pool, page);
+ rx_chn->pages[desc_idx] = NULL;
+out:
+ return ret;
+}
+
static void am65_cpsw_nuss_rx_ts(struct sk_buff *skb, u32 *psdata)
{
struct skb_shared_hwtstamps *ssh;
@@ -795,7 +1080,7 @@ static void am65_cpsw_nuss_rx_csum(struct sk_buff *skb, u32 csum_info)
}

static int am65_cpsw_nuss_rx_packets(struct am65_cpsw_common *common,
- u32 flow_idx)
+ u32 flow_idx, int cpu)
{
struct am65_cpsw_rx_chn *rx_chn = &common->rx_chns;
u32 buf_dma_len, pkt_len, port_id = 0, csum_info;
@@ -806,10 +1091,12 @@ static int am65_cpsw_nuss_rx_packets(struct am65_cpsw_common *common,
struct sk_buff *skb, *new_skb;
dma_addr_t desc_dma, buf_dma;
struct am65_cpsw_port *port;
+ int headroom, desc_idx, ret;
struct net_device *ndev;
+ struct xdp_buff xdp;
+ struct page *page;
void **swdata;
u32 *psdata;
- int ret = 0;

ret = k3_udma_glue_pop_rx_chn(rx_chn->rx_chn, flow_idx, &desc_dma);
if (ret) {
@@ -851,11 +1138,30 @@ static int am65_cpsw_nuss_rx_packets(struct am65_cpsw_common *common,

k3_cppi_desc_pool_free(rx_chn->desc_pool, desc_rx);

- new_skb = netdev_alloc_skb_ip_align(ndev, AM65_CPSW_MAX_PACKET_SIZE);
+ desc_idx = am65_cpsw_nuss_desc_idx(rx_chn->desc_pool, desc_rx, rx_chn->dsize_log2);
+
+ if (port->xdp_prog) {
+ xdp_init_buff(&xdp, AM65_CPSW_MAX_PACKET_SIZE, &port->xdp_rxq);
+
+ page = virt_to_page(skb->data);
+ xdp_prepare_buff(&xdp, page_address(page), skb_headroom(skb), pkt_len, false);
+
+ ret = am65_cpsw_run_xdp(common, port, &xdp, desc_idx, cpu, &pkt_len);
+ if (ret != AM65_CPSW_XDP_PASS)
+ return ret;
+
+ /* Compute additional headroom to be reserved */
+ headroom = (xdp.data - xdp.data_hard_start) - skb_headroom(skb);
+ skb_reserve(skb, headroom);
+ }
+
+ /* Pass skb to netstack if no XDP prog or returned XDP_PASS */
+ new_skb = am65_cpsw_alloc_skb(rx_chn, ndev, AM65_CPSW_MAX_PACKET_SIZE, desc_idx);
if (new_skb) {
ndev_priv = netdev_priv(ndev);
am65_cpsw_nuss_set_offload_fwd_mark(skb, ndev_priv->offload_fwd_mark);
skb_put(skb, pkt_len);
+ skb_mark_for_recycle(skb);
skb->protocol = eth_type_trans(skb, ndev);
am65_cpsw_nuss_rx_csum(skb, csum_info);
napi_gro_receive(&common->napi_rx, skb);
@@ -901,6 +1207,7 @@ static int am65_cpsw_nuss_rx_poll(struct napi_struct *napi_rx, int budget)
{
struct am65_cpsw_common *common = am65_cpsw_napi_to_common(napi_rx);
int flow = AM65_CPSW_MAX_RX_FLOWS;
+ int cpu = smp_processor_id();
int cur_budget, ret;
int num_rx = 0;

@@ -909,7 +1216,7 @@ static int am65_cpsw_nuss_rx_poll(struct napi_struct *napi_rx, int budget)
cur_budget = budget - num_rx;

while (cur_budget--) {
- ret = am65_cpsw_nuss_rx_packets(common, flow);
+ ret = am65_cpsw_nuss_rx_packets(common, flow, cpu);
if (ret)
break;
num_rx++;
@@ -938,8 +1245,8 @@ static int am65_cpsw_nuss_rx_poll(struct napi_struct *napi_rx, int budget)
}

static struct sk_buff *
-am65_cpsw_nuss_tx_compl_packet(struct am65_cpsw_tx_chn *tx_chn,
- dma_addr_t desc_dma)
+am65_cpsw_nuss_tx_compl_packet_skb(struct am65_cpsw_tx_chn *tx_chn,
+ dma_addr_t desc_dma)
{
struct am65_cpsw_ndev_priv *ndev_priv;
struct am65_cpsw_ndev_stats *stats;
@@ -968,6 +1275,39 @@ am65_cpsw_nuss_tx_compl_packet(struct am65_cpsw_tx_chn *tx_chn,
return skb;
}

+static struct xdp_frame *
+am65_cpsw_nuss_tx_compl_packet_xdp(struct am65_cpsw_common *common,
+ struct am65_cpsw_tx_chn *tx_chn,
+ dma_addr_t desc_dma,
+ struct net_device **ndev)
+{
+ struct am65_cpsw_ndev_priv *ndev_priv;
+ struct am65_cpsw_ndev_stats *stats;
+ struct cppi5_host_desc_t *desc_tx;
+ struct am65_cpsw_port *port;
+ struct xdp_frame *xdpf;
+ u32 port_id = 0;
+ void **swdata;
+
+ desc_tx = k3_cppi_desc_pool_dma2virt(tx_chn->desc_pool, desc_dma);
+ cppi5_desc_get_tags_ids(&desc_tx->hdr, NULL, &port_id);
+ swdata = cppi5_hdesc_get_swdata(desc_tx);
+ xdpf = *(swdata);
+ am65_cpsw_nuss_xmit_free(tx_chn, desc_tx);
+
+ port = am65_common_get_port(common, port_id);
+ *ndev = port->ndev;
+
+ ndev_priv = netdev_priv(*ndev);
+ stats = this_cpu_ptr(ndev_priv->stats);
+ u64_stats_update_begin(&stats->syncp);
+ stats->tx_packets++;
+ stats->tx_bytes += xdpf->len;
+ u64_stats_update_end(&stats->syncp);
+
+ return xdpf;
+}
+
static void am65_cpsw_nuss_tx_wake(struct am65_cpsw_tx_chn *tx_chn, struct net_device *ndev,
struct netdev_queue *netif_txq)
{
@@ -988,11 +1328,13 @@ static void am65_cpsw_nuss_tx_wake(struct am65_cpsw_tx_chn *tx_chn, struct net_d
static int am65_cpsw_nuss_tx_compl_packets(struct am65_cpsw_common *common,
int chn, unsigned int budget, bool *tdown)
{
+ enum am65_cpsw_tx_buf_type buf_type;
struct device *dev = common->dev;
struct am65_cpsw_tx_chn *tx_chn;
struct netdev_queue *netif_txq;
unsigned int total_bytes = 0;
struct net_device *ndev;
+ struct xdp_frame *xdpf;
struct sk_buff *skb;
dma_addr_t desc_dma;
int res, num_tx = 0;
@@ -1013,10 +1355,20 @@ static int am65_cpsw_nuss_tx_compl_packets(struct am65_cpsw_common *common,
break;
}

- skb = am65_cpsw_nuss_tx_compl_packet(tx_chn, desc_dma);
- total_bytes = skb->len;
- ndev = skb->dev;
- napi_consume_skb(skb, budget);
+ buf_type = am65_cpsw_nuss_buf_type(tx_chn, desc_dma);
+ if (buf_type == AM65_CPSW_TX_BUF_TYPE_SKB) {
+ skb = am65_cpsw_nuss_tx_compl_packet_skb(tx_chn, desc_dma);
+ ndev = skb->dev;
+ total_bytes = skb->len;
+ napi_consume_skb(skb, budget);
+ } else {
+ xdpf = am65_cpsw_nuss_tx_compl_packet_xdp(common, tx_chn, desc_dma, &ndev);
+ total_bytes = xdpf->len;
+ if (buf_type == AM65_CPSW_TX_BUF_TYPE_XDP_TX)
+ xdp_return_frame_rx_napi(xdpf);
+ else
+ xdp_return_frame(xdpf);
+ }
num_tx++;

netif_txq = netdev_get_tx_queue(ndev, chn);
@@ -1034,11 +1386,13 @@ static int am65_cpsw_nuss_tx_compl_packets(struct am65_cpsw_common *common,
static int am65_cpsw_nuss_tx_compl_packets_2g(struct am65_cpsw_common *common,
int chn, unsigned int budget, bool *tdown)
{
+ enum am65_cpsw_tx_buf_type buf_type;
struct device *dev = common->dev;
struct am65_cpsw_tx_chn *tx_chn;
struct netdev_queue *netif_txq;
unsigned int total_bytes = 0;
struct net_device *ndev;
+ struct xdp_frame *xdpf;
struct sk_buff *skb;
dma_addr_t desc_dma;
int res, num_tx = 0;
@@ -1057,11 +1411,20 @@ static int am65_cpsw_nuss_tx_compl_packets_2g(struct am65_cpsw_common *common,
break;
}

- skb = am65_cpsw_nuss_tx_compl_packet(tx_chn, desc_dma);
-
- ndev = skb->dev;
- total_bytes += skb->len;
- napi_consume_skb(skb, budget);
+ buf_type = am65_cpsw_nuss_buf_type(tx_chn, desc_dma);
+ if (buf_type == AM65_CPSW_TX_BUF_TYPE_SKB) {
+ skb = am65_cpsw_nuss_tx_compl_packet_skb(tx_chn, desc_dma);
+ ndev = skb->dev;
+ total_bytes += skb->len;
+ napi_consume_skb(skb, budget);
+ } else {
+ xdpf = am65_cpsw_nuss_tx_compl_packet_xdp(common, tx_chn, desc_dma, &ndev);
+ total_bytes += xdpf->len;
+ if (buf_type == AM65_CPSW_TX_BUF_TYPE_XDP_TX)
+ xdp_return_frame_rx_napi(xdpf);
+ else
+ xdp_return_frame(xdpf);
+ }
num_tx++;
}

@@ -1183,10 +1546,12 @@ static netdev_tx_t am65_cpsw_nuss_ndo_slave_xmit(struct sk_buff *skb,
goto busy_stop_q;
}

+ am65_cpsw_nuss_set_buf_type(tx_chn, first_desc, AM65_CPSW_TX_BUF_TYPE_SKB);
+
cppi5_hdesc_init(first_desc, CPPI5_INFO0_HDESC_EPIB_PRESENT,
AM65_CPSW_NAV_PS_DATA_SIZE);
- cppi5_desc_set_pktids(&first_desc->hdr, 0, 0x3FFF);
- cppi5_hdesc_set_pkttype(first_desc, 0x7);
+ cppi5_desc_set_pktids(&first_desc->hdr, 0, AM65_CPSW_CPPI_TX_FLOW_ID);
+ cppi5_hdesc_set_pkttype(first_desc, AM65_CPSW_CPPI_TX_PKT_TYPE);
cppi5_desc_set_tags_ids(&first_desc->hdr, 0, port->port_id);

k3_udma_glue_tx_dma_to_cppi5_addr(tx_chn->tx_chn, &buf_dma);
@@ -1225,6 +1590,8 @@ static netdev_tx_t am65_cpsw_nuss_ndo_slave_xmit(struct sk_buff *skb,
goto busy_free_descs;
}

+ am65_cpsw_nuss_set_buf_type(tx_chn, next_desc, AM65_CPSW_TX_BUF_TYPE_SKB);
+
buf_dma = skb_frag_dma_map(tx_chn->dma_dev, frag, 0, frag_size,
DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(tx_chn->dma_dev, buf_dma))) {
@@ -1488,6 +1855,58 @@ static void am65_cpsw_nuss_ndo_get_stats(struct net_device *dev,
stats->tx_dropped = dev->stats.tx_dropped;
}

+static int am65_cpsw_xdp_prog_setup(struct net_device *ndev, struct bpf_prog *prog)
+{
+ struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
+ bool running = netif_running(ndev);
+ struct bpf_prog *old_prog;
+
+ if (running)
+ am65_cpsw_nuss_ndo_slave_stop(ndev);
+
+ old_prog = xchg(&port->xdp_prog, prog);
+ if (old_prog)
+ bpf_prog_put(old_prog);
+
+ if (running)
+ return am65_cpsw_nuss_ndo_slave_open(ndev);
+
+ return 0;
+}
+
+static int am65_cpsw_ndo_bpf(struct net_device *ndev, struct netdev_bpf *bpf)
+{
+ switch (bpf->command) {
+ case XDP_SETUP_PROG:
+ return am65_cpsw_xdp_prog_setup(ndev, bpf->prog);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int am65_cpsw_ndo_xdp_xmit(struct net_device *ndev, int n,
+ struct xdp_frame **frames, u32 flags)
+{
+ struct am65_cpsw_tx_chn *tx_chn;
+ struct netdev_queue *netif_txq;
+ int cpu = smp_processor_id();
+ int i, nxmit = 0;
+
+ tx_chn = &am65_ndev_to_common(ndev)->tx_chns[cpu % AM65_CPSW_MAX_TX_QUEUES];
+ netif_txq = netdev_get_tx_queue(ndev, tx_chn->id);
+
+ __netif_tx_lock(netif_txq, cpu);
+ for (i = 0; i < n; i++) {
+ if (am65_cpsw_xdp_tx_frame(ndev, tx_chn, frames[i],
+ AM65_CPSW_TX_BUF_TYPE_XDP_NDO))
+ break;
+ nxmit++;
+ }
+ __netif_tx_unlock(netif_txq);
+
+ return nxmit;
+}
+
static const struct net_device_ops am65_cpsw_nuss_netdev_ops = {
.ndo_open = am65_cpsw_nuss_ndo_slave_open,
.ndo_stop = am65_cpsw_nuss_ndo_slave_stop,
@@ -1502,6 +1921,8 @@ static const struct net_device_ops am65_cpsw_nuss_netdev_ops = {
.ndo_eth_ioctl = am65_cpsw_nuss_ndo_slave_ioctl,
.ndo_setup_tc = am65_cpsw_qos_ndo_setup_tc,
.ndo_set_tx_maxrate = am65_cpsw_qos_ndo_tx_p0_set_maxrate,
+ .ndo_bpf = am65_cpsw_ndo_bpf,
+ .ndo_xdp_xmit = am65_cpsw_ndo_xdp_xmit,
};

static void am65_cpsw_disable_phy(struct phy *phy)
@@ -1772,7 +2193,7 @@ static int am65_cpsw_nuss_init_tx_chns(struct am65_cpsw_common *common)
.mode = K3_RINGACC_RING_MODE_RING,
.flags = 0
};
- u32 hdesc_size;
+ u32 hdesc_size, hdesc_size_out;
int i, ret = 0;

hdesc_size = cppi5_hdesc_calc_size(true, AM65_CPSW_NAV_PS_DATA_SIZE,
@@ -1816,6 +2237,10 @@ static int am65_cpsw_nuss_init_tx_chns(struct am65_cpsw_common *common)
goto err;
}

+ hdesc_size_out = k3_cppi_desc_pool_desc_size(tx_chn->desc_pool);
+ tx_chn->dsize_log2 = __fls(hdesc_size_out);
+ WARN_ON(hdesc_size_out != (1 << tx_chn->dsize_log2));
+
tx_chn->irq = k3_udma_glue_tx_get_irq(tx_chn->tx_chn);
if (tx_chn->irq < 0) {
dev_err(dev, "Failed to get tx dma irq %d\n",
@@ -1862,8 +2287,8 @@ static void am65_cpsw_nuss_free_rx_chns(void *data)
static void am65_cpsw_nuss_remove_rx_chns(void *data)
{
struct am65_cpsw_common *common = data;
- struct am65_cpsw_rx_chn *rx_chn;
struct device *dev = common->dev;
+ struct am65_cpsw_rx_chn *rx_chn;

rx_chn = &common->rx_chns;
devm_remove_action(dev, am65_cpsw_nuss_free_rx_chns, common);
@@ -1873,11 +2298,7 @@ static void am65_cpsw_nuss_remove_rx_chns(void *data)

netif_napi_del(&common->napi_rx);

- if (!IS_ERR_OR_NULL(rx_chn->desc_pool))
- k3_cppi_desc_pool_destroy(rx_chn->desc_pool);
-
- if (!IS_ERR_OR_NULL(rx_chn->rx_chn))
- k3_udma_glue_release_rx_chn(rx_chn->rx_chn);
+ am65_cpsw_nuss_free_rx_chns(common);

common->rx_flow_id_base = -1;
}
@@ -1888,7 +2309,7 @@ static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)
struct k3_udma_glue_rx_channel_cfg rx_cfg = { 0 };
u32 max_desc_num = AM65_CPSW_MAX_RX_DESC;
struct device *dev = common->dev;
- u32 hdesc_size;
+ u32 hdesc_size, hdesc_size_out;
u32 fdqring_id;
int i, ret = 0;

@@ -1920,6 +2341,16 @@ static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)
goto err;
}

+ hdesc_size_out = k3_cppi_desc_pool_desc_size(rx_chn->desc_pool);
+ rx_chn->dsize_log2 = __fls(hdesc_size_out);
+ WARN_ON(hdesc_size_out != (1 << rx_chn->dsize_log2));
+
+ rx_chn->page_pool = NULL;
+
+ rx_chn->pages = devm_kcalloc(dev, rx_chn->descs_num, sizeof(*rx_chn->pages), GFP_KERNEL);
+ if (!rx_chn->pages)
+ return -ENOMEM;
+
common->rx_flow_id_base =
k3_udma_glue_rx_get_flow_id_base(rx_chn->rx_chn);
dev_info(dev, "set new flow-id-base %u\n", common->rx_flow_id_base);
@@ -2252,6 +2683,9 @@ am65_cpsw_nuss_init_port_ndev(struct am65_cpsw_common *common, u32 port_idx)
NETIF_F_HW_TC;
port->ndev->features = port->ndev->hw_features |
NETIF_F_HW_VLAN_CTAG_FILTER;
+ port->ndev->xdp_features = NETDEV_XDP_ACT_BASIC |
+ NETDEV_XDP_ACT_REDIRECT |
+ NETDEV_XDP_ACT_NDO_XMIT;
port->ndev->vlan_features |= NETIF_F_SG;
port->ndev->netdev_ops = &am65_cpsw_nuss_netdev_ops;
port->ndev->ethtool_ops = &am65_cpsw_ethtool_ops_slave;
@@ -2315,6 +2749,8 @@ am65_cpsw_nuss_init_port_ndev(struct am65_cpsw_common *common, u32 port_idx)
if (ret)
dev_err(dev, "failed to add percpu stat free action %d\n", ret);

+ port->xdp_prog = NULL;
+
if (!common->dma_ndev)
common->dma_ndev = port->ndev;

@@ -2940,9 +3376,9 @@ static int am65_cpsw_nuss_probe(struct platform_device *pdev)
struct device_node *node;
struct resource *res;
struct clk *clk;
+ int ale_entries;
u64 id_temp;
int ret, i;
- int ale_entries;

common = devm_kzalloc(dev, sizeof(struct am65_cpsw_common), GFP_KERNEL);
if (!common)
@@ -3154,10 +3590,10 @@ static int am65_cpsw_nuss_suspend(struct device *dev)
static int am65_cpsw_nuss_resume(struct device *dev)
{
struct am65_cpsw_common *common = dev_get_drvdata(dev);
+ struct am65_cpsw_host *host_p = am65_common_get_host(common);
struct am65_cpsw_port *port;
struct net_device *ndev;
int i, ret;
- struct am65_cpsw_host *host_p = am65_common_get_host(common);

ret = am65_cpsw_nuss_init_tx_chns(common);
if (ret)
diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.h b/drivers/net/ethernet/ti/am65-cpsw-nuss.h
index 7da0492dc091..d8ce88dc9c89 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.h
+++ b/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;
};

--
2.37.3