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openwrt/target/linux/generic/backport-5.15/706-01-v6.0-net-ethernet-mt...

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From 7c26c20da5d420cde55618263be4aa2f6de53056 Mon Sep 17 00:00:00 2001
From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: Fri, 22 Jul 2022 09:19:37 +0200
Subject: [PATCH] net: ethernet: mtk_eth_soc: add basic XDP support
Introduce basic XDP support to mtk_eth_soc driver.
Supported XDP verdicts:
- XDP_PASS
- XDP_DROP
- XDP_REDIRECT
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 162 +++++++++++++++++---
drivers/net/ethernet/mediatek/mtk_eth_soc.h | 2 +
2 files changed, 145 insertions(+), 19 deletions(-)
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1388,6 +1388,11 @@ static void mtk_update_rx_cpu_idx(struct
}
}
+static bool mtk_page_pool_enabled(struct mtk_eth *eth)
+{
+ return !eth->hwlro;
+}
+
static struct page_pool *mtk_create_page_pool(struct mtk_eth *eth,
struct xdp_rxq_info *xdp_q,
int id, int size)
@@ -1450,11 +1455,52 @@ static void mtk_rx_put_buff(struct mtk_r
skb_free_frag(data);
}
+static u32 mtk_xdp_run(struct mtk_eth *eth, struct mtk_rx_ring *ring,
+ struct xdp_buff *xdp, struct net_device *dev)
+{
+ struct bpf_prog *prog;
+ u32 act = XDP_PASS;
+
+ rcu_read_lock();
+
+ prog = rcu_dereference(eth->prog);
+ if (!prog)
+ goto out;
+
+ act = bpf_prog_run_xdp(prog, xdp);
+ switch (act) {
+ case XDP_PASS:
+ goto out;
+ case XDP_REDIRECT:
+ if (unlikely(xdp_do_redirect(dev, xdp, prog))) {
+ act = XDP_DROP;
+ break;
+ }
+ goto out;
+ default:
+ bpf_warn_invalid_xdp_action(act);
+ fallthrough;
+ case XDP_ABORTED:
+ trace_xdp_exception(dev, prog, act);
+ fallthrough;
+ case XDP_DROP:
+ break;
+ }
+
+ page_pool_put_full_page(ring->page_pool,
+ virt_to_head_page(xdp->data), true);
+out:
+ rcu_read_unlock();
+
+ return act;
+}
+
static int mtk_poll_rx(struct napi_struct *napi, int budget,
struct mtk_eth *eth)
{
struct dim_sample dim_sample = {};
struct mtk_rx_ring *ring;
+ bool xdp_flush = false;
int idx;
struct sk_buff *skb;
u8 *data, *new_data;
@@ -1463,9 +1509,9 @@ static int mtk_poll_rx(struct napi_struc
while (done < budget) {
unsigned int pktlen, *rxdcsum;
- u32 hash, reason, reserve_len;
struct net_device *netdev;
dma_addr_t dma_addr;
+ u32 hash, reason;
int mac = 0;
ring = mtk_get_rx_ring(eth);
@@ -1495,8 +1541,14 @@ static int mtk_poll_rx(struct napi_struc
if (unlikely(test_bit(MTK_RESETTING, &eth->state)))
goto release_desc;
+ pktlen = RX_DMA_GET_PLEN0(trxd.rxd2);
+
/* alloc new buffer */
if (ring->page_pool) {
+ struct page *page = virt_to_head_page(data);
+ struct xdp_buff xdp;
+ u32 ret;
+
new_data = mtk_page_pool_get_buff(ring->page_pool,
&dma_addr,
GFP_ATOMIC);
@@ -1504,6 +1556,34 @@ static int mtk_poll_rx(struct napi_struc
netdev->stats.rx_dropped++;
goto release_desc;
}
+
+ dma_sync_single_for_cpu(eth->dma_dev,
+ page_pool_get_dma_addr(page) + MTK_PP_HEADROOM,
+ pktlen, page_pool_get_dma_dir(ring->page_pool));
+
+ xdp_init_buff(&xdp, PAGE_SIZE, &ring->xdp_q);
+ xdp_prepare_buff(&xdp, data, MTK_PP_HEADROOM, pktlen,
+ false);
+ xdp_buff_clear_frags_flag(&xdp);
+
+ ret = mtk_xdp_run(eth, ring, &xdp, netdev);
+ if (ret == XDP_REDIRECT)
+ xdp_flush = true;
+
+ if (ret != XDP_PASS)
+ goto skip_rx;
+
+ skb = build_skb(data, PAGE_SIZE);
+ if (unlikely(!skb)) {
+ page_pool_put_full_page(ring->page_pool,
+ page, true);
+ netdev->stats.rx_dropped++;
+ goto skip_rx;
+ }
+
+ skb_reserve(skb, xdp.data - xdp.data_hard_start);
+ skb_put(skb, xdp.data_end - xdp.data);
+ skb_mark_for_recycle(skb);
} else {
if (ring->frag_size <= PAGE_SIZE)
new_data = napi_alloc_frag(ring->frag_size);
@@ -1527,27 +1607,20 @@ static int mtk_poll_rx(struct napi_struc
dma_unmap_single(eth->dma_dev, trxd.rxd1,
ring->buf_size, DMA_FROM_DEVICE);
- }
- /* receive data */
- skb = build_skb(data, ring->frag_size);
- if (unlikely(!skb)) {
- mtk_rx_put_buff(ring, data, true);
- netdev->stats.rx_dropped++;
- goto skip_rx;
- }
+ skb = build_skb(data, ring->frag_size);
+ if (unlikely(!skb)) {
+ netdev->stats.rx_dropped++;
+ skb_free_frag(data);
+ goto skip_rx;
+ }
- if (ring->page_pool) {
- reserve_len = MTK_PP_HEADROOM;
- skb_mark_for_recycle(skb);
- } else {
- reserve_len = NET_SKB_PAD + NET_IP_ALIGN;
+ skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
+ skb_put(skb, pktlen);
}
- skb_reserve(skb, reserve_len);
- pktlen = RX_DMA_GET_PLEN0(trxd.rxd2);
skb->dev = netdev;
- skb_put(skb, pktlen);
+ bytes += skb->len;
if (MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2))
rxdcsum = &trxd.rxd3;
@@ -1559,7 +1632,6 @@ static int mtk_poll_rx(struct napi_struc
else
skb_checksum_none_assert(skb);
skb->protocol = eth_type_trans(skb, netdev);
- bytes += pktlen;
hash = trxd.rxd4 & MTK_RXD4_FOE_ENTRY;
if (hash != MTK_RXD4_FOE_ENTRY) {
@@ -1622,6 +1694,9 @@ rx_done:
&dim_sample);
net_dim(&eth->rx_dim, dim_sample);
+ if (xdp_flush)
+ xdp_do_flush_map();
+
return done;
}
@@ -1967,7 +2042,7 @@ static int mtk_rx_alloc(struct mtk_eth *
if (!ring->data)
return -ENOMEM;
- if (!eth->hwlro) {
+ if (mtk_page_pool_enabled(eth)) {
struct page_pool *pp;
pp = mtk_create_page_pool(eth, &ring->xdp_q, ring_no,
@@ -2712,6 +2787,48 @@ static int mtk_stop(struct net_device *d
return 0;
}
+static int mtk_xdp_setup(struct net_device *dev, struct bpf_prog *prog,
+ struct netlink_ext_ack *extack)
+{
+ struct mtk_mac *mac = netdev_priv(dev);
+ struct mtk_eth *eth = mac->hw;
+ struct bpf_prog *old_prog;
+ bool need_update;
+
+ if (eth->hwlro) {
+ NL_SET_ERR_MSG_MOD(extack, "XDP not supported with HWLRO");
+ return -EOPNOTSUPP;
+ }
+
+ if (dev->mtu > MTK_PP_MAX_BUF_SIZE) {
+ NL_SET_ERR_MSG_MOD(extack, "MTU too large for XDP");
+ return -EOPNOTSUPP;
+ }
+
+ need_update = !!eth->prog != !!prog;
+ if (netif_running(dev) && need_update)
+ mtk_stop(dev);
+
+ old_prog = rcu_replace_pointer(eth->prog, prog, lockdep_rtnl_is_held());
+ if (old_prog)
+ bpf_prog_put(old_prog);
+
+ if (netif_running(dev) && need_update)
+ return mtk_open(dev);
+
+ return 0;
+}
+
+static int mtk_xdp(struct net_device *dev, struct netdev_bpf *xdp)
+{
+ switch (xdp->command) {
+ case XDP_SETUP_PROG:
+ return mtk_xdp_setup(dev, xdp->prog, xdp->extack);
+ default:
+ return -EINVAL;
+ }
+}
+
static void ethsys_reset(struct mtk_eth *eth, u32 reset_bits)
{
regmap_update_bits(eth->ethsys, ETHSYS_RSTCTRL,
@@ -2990,6 +3107,12 @@ static int mtk_change_mtu(struct net_dev
struct mtk_eth *eth = mac->hw;
u32 mcr_cur, mcr_new;
+ if (rcu_access_pointer(eth->prog) &&
+ length > MTK_PP_MAX_BUF_SIZE) {
+ netdev_err(dev, "Invalid MTU for XDP mode\n");
+ return -EINVAL;
+ }
+
if (!MTK_HAS_CAPS(eth->soc->caps, MTK_SOC_MT7628)) {
mcr_cur = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
mcr_new = mcr_cur & ~MAC_MCR_MAX_RX_MASK;
@@ -3316,6 +3439,7 @@ static const struct net_device_ops mtk_n
.ndo_poll_controller = mtk_poll_controller,
#endif
.ndo_setup_tc = mtk_eth_setup_tc,
+ .ndo_bpf = mtk_xdp,
};
static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np)
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -1086,6 +1086,8 @@ struct mtk_eth {
struct mtk_ppe *ppe;
struct rhashtable flow_table;
+
+ struct bpf_prog __rcu *prog;
};
/* struct mtk_mac - the structure that holds the info about the MACs of the
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