1 // SPDX-License-Identifier: GPL-2.0+
2
3 #include <linux/bpf.h>
4 #include <linux/bpf_trace.h>
5 #include <linux/filter.h>
6
7 #include "lan966x_main.h"
8
lan966x_xdp_setup(struct net_device * dev,struct netdev_bpf * xdp)9 static int lan966x_xdp_setup(struct net_device *dev, struct netdev_bpf *xdp)
10 {
11 struct lan966x_port *port = netdev_priv(dev);
12 struct lan966x *lan966x = port->lan966x;
13 struct bpf_prog *old_prog;
14 bool old_xdp, new_xdp;
15 int err;
16
17 if (!lan966x->fdma) {
18 NL_SET_ERR_MSG_MOD(xdp->extack,
19 "Allow to set xdp only when using fdma");
20 return -EOPNOTSUPP;
21 }
22
23 old_xdp = lan966x_xdp_present(lan966x);
24 old_prog = xchg(&port->xdp_prog, xdp->prog);
25 new_xdp = lan966x_xdp_present(lan966x);
26
27 if (old_xdp == new_xdp)
28 goto out;
29
30 err = lan966x_fdma_reload_page_pool(lan966x);
31 if (err) {
32 xchg(&port->xdp_prog, old_prog);
33 return err;
34 }
35
36 out:
37 if (old_prog)
38 bpf_prog_put(old_prog);
39
40 return 0;
41 }
42
lan966x_xdp(struct net_device * dev,struct netdev_bpf * xdp)43 int lan966x_xdp(struct net_device *dev, struct netdev_bpf *xdp)
44 {
45 switch (xdp->command) {
46 case XDP_SETUP_PROG:
47 return lan966x_xdp_setup(dev, xdp);
48 default:
49 return -EINVAL;
50 }
51 }
52
lan966x_xdp_xmit(struct net_device * dev,int n,struct xdp_frame ** frames,u32 flags)53 int lan966x_xdp_xmit(struct net_device *dev,
54 int n,
55 struct xdp_frame **frames,
56 u32 flags)
57 {
58 struct lan966x_port *port = netdev_priv(dev);
59 int nxmit = 0;
60
61 for (int i = 0; i < n; ++i) {
62 struct xdp_frame *xdpf = frames[i];
63 int err;
64
65 err = lan966x_fdma_xmit_xdpf(port, xdpf, NULL, true);
66 if (err)
67 break;
68
69 nxmit++;
70 }
71
72 return nxmit;
73 }
74
lan966x_xdp_run(struct lan966x_port * port,struct page * page,u32 data_len)75 int lan966x_xdp_run(struct lan966x_port *port, struct page *page, u32 data_len)
76 {
77 struct bpf_prog *xdp_prog = port->xdp_prog;
78 struct lan966x *lan966x = port->lan966x;
79 struct xdp_frame *xdpf;
80 struct xdp_buff xdp;
81 u32 act;
82
83 xdp_init_buff(&xdp, PAGE_SIZE << lan966x->rx.page_order,
84 &port->xdp_rxq);
85 xdp_prepare_buff(&xdp, page_address(page),
86 IFH_LEN_BYTES + XDP_PACKET_HEADROOM,
87 data_len - IFH_LEN_BYTES, false);
88 act = bpf_prog_run_xdp(xdp_prog, &xdp);
89 switch (act) {
90 case XDP_PASS:
91 return FDMA_PASS;
92 case XDP_TX:
93 xdpf = xdp_convert_buff_to_frame(&xdp);
94 if (!xdpf)
95 return FDMA_DROP;
96
97 return lan966x_fdma_xmit_xdpf(port, xdpf, page, false) ?
98 FDMA_DROP : FDMA_TX;
99 case XDP_REDIRECT:
100 if (xdp_do_redirect(port->dev, &xdp, xdp_prog))
101 return FDMA_DROP;
102
103 return FDMA_REDIRECT;
104 default:
105 bpf_warn_invalid_xdp_action(port->dev, xdp_prog, act);
106 fallthrough;
107 case XDP_ABORTED:
108 trace_xdp_exception(port->dev, xdp_prog, act);
109 fallthrough;
110 case XDP_DROP:
111 return FDMA_DROP;
112 }
113 }
114
lan966x_xdp_present(struct lan966x * lan966x)115 bool lan966x_xdp_present(struct lan966x *lan966x)
116 {
117 for (int p = 0; p < lan966x->num_phys_ports; ++p) {
118 if (!lan966x->ports[p])
119 continue;
120
121 if (lan966x_xdp_port_present(lan966x->ports[p]))
122 return true;
123 }
124
125 return false;
126 }
127
lan966x_xdp_port_init(struct lan966x_port * port)128 int lan966x_xdp_port_init(struct lan966x_port *port)
129 {
130 struct lan966x *lan966x = port->lan966x;
131
132 return xdp_rxq_info_reg(&port->xdp_rxq, port->dev, 0,
133 lan966x->napi.napi_id);
134 }
135
lan966x_xdp_port_deinit(struct lan966x_port * port)136 void lan966x_xdp_port_deinit(struct lan966x_port *port)
137 {
138 if (xdp_rxq_info_is_reg(&port->xdp_rxq))
139 xdp_rxq_info_unreg(&port->xdp_rxq);
140 }
141