2 * Copyright (C) 2016 Netronome Systems, Inc.
4 * This software is dual licensed under the GNU General License Version 2,
5 * June 1991 as shown in the file COPYING in the top-level directory of this
6 * source tree or the BSD 2-Clause License provided below. You have the
7 * option to license this software under the complete terms of either license.
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12 * without modification, are permitted provided that the following
15 * 1. Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
19 * 2. Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
36 * Netronome network device driver: TC offload functions for PF and VF
39 #include <linux/kernel.h>
40 #include <linux/netdevice.h>
41 #include <linux/pci.h>
42 #include <linux/jiffies.h>
43 #include <linux/timer.h>
44 #include <linux/list.h>
46 #include <net/pkt_cls.h>
47 #include <net/tc_act/tc_gact.h>
48 #include <net/tc_act/tc_mirred.h>
51 #include "nfp_net_ctrl.h"
54 void nfp_net_filter_stats_timer(unsigned long data)
56 struct nfp_net *nn = (void *)data;
57 struct nfp_stat_pair latest;
59 spin_lock_bh(&nn->rx_filter_lock);
61 if (nn->ctrl & NFP_NET_CFG_CTRL_BPF)
62 mod_timer(&nn->rx_filter_stats_timer,
63 jiffies + NFP_NET_STAT_POLL_IVL);
65 spin_unlock_bh(&nn->rx_filter_lock);
67 latest.pkts = nn_readq(nn, NFP_NET_CFG_STATS_APP1_FRAMES);
68 latest.bytes = nn_readq(nn, NFP_NET_CFG_STATS_APP1_BYTES);
70 if (latest.pkts != nn->rx_filter.pkts)
71 nn->rx_filter_change = jiffies;
73 nn->rx_filter = latest;
76 static void nfp_net_bpf_stats_reset(struct nfp_net *nn)
78 nn->rx_filter.pkts = nn_readq(nn, NFP_NET_CFG_STATS_APP1_FRAMES);
79 nn->rx_filter.bytes = nn_readq(nn, NFP_NET_CFG_STATS_APP1_BYTES);
80 nn->rx_filter_prev = nn->rx_filter;
81 nn->rx_filter_change = jiffies;
85 nfp_net_bpf_stats_update(struct nfp_net *nn, struct tc_cls_bpf_offload *cls_bpf)
91 pkts = nn->rx_filter.pkts - nn->rx_filter_prev.pkts;
92 bytes = nn->rx_filter.bytes - nn->rx_filter_prev.bytes;
93 bytes -= pkts * ETH_HLEN;
95 nn->rx_filter_prev = nn->rx_filter;
99 tcf_exts_to_list(cls_bpf->exts, &actions);
100 list_for_each_entry(a, &actions, list)
101 tcf_action_stats_update(a, bytes, pkts, nn->rx_filter_change);
109 nfp_net_bpf_get_act(struct nfp_net *nn, struct tc_cls_bpf_offload *cls_bpf)
111 const struct tc_action *a;
114 /* TC direct action */
115 if (cls_bpf->exts_integrated) {
116 if (tc_no_actions(cls_bpf->exts))
117 return NN_ACT_DIRECT;
123 if (!tc_single_action(cls_bpf->exts))
126 tcf_exts_to_list(cls_bpf->exts, &actions);
127 list_for_each_entry(a, &actions, list) {
128 if (is_tcf_gact_shot(a))
129 return NN_ACT_TC_DROP;
131 if (is_tcf_mirred_redirect(a) &&
132 tcf_mirred_ifindex(a) == nn->netdev->ifindex)
133 return NN_ACT_TC_REDIR;
140 nfp_net_bpf_offload_prepare(struct nfp_net *nn,
141 struct tc_cls_bpf_offload *cls_bpf,
142 struct nfp_bpf_result *res,
143 void **code, dma_addr_t *dma_addr, u16 max_instr)
145 unsigned int code_sz = max_instr * sizeof(u64);
146 enum nfp_bpf_action_type act;
147 u16 start_off, done_off;
148 unsigned int max_mtu;
151 if (!IS_ENABLED(CONFIG_BPF_SYSCALL))
154 ret = nfp_net_bpf_get_act(nn, cls_bpf);
159 max_mtu = nn_readb(nn, NFP_NET_CFG_BPF_INL_MTU) * 64 - 32;
160 if (max_mtu < nn->netdev->mtu) {
161 nn_info(nn, "BPF offload not supported with MTU larger than HW packet split boundary\n");
165 start_off = nn_readw(nn, NFP_NET_CFG_BPF_START);
166 done_off = nn_readw(nn, NFP_NET_CFG_BPF_DONE);
168 *code = dma_zalloc_coherent(&nn->pdev->dev, code_sz, dma_addr,
173 ret = nfp_bpf_jit(cls_bpf->prog, *code, act, start_off, done_off,
181 dma_free_coherent(&nn->pdev->dev, code_sz, *code, *dma_addr);
186 nfp_net_bpf_load_and_start(struct nfp_net *nn, u32 tc_flags,
187 void *code, dma_addr_t dma_addr,
188 unsigned int code_sz, unsigned int n_instr,
191 u64 bpf_addr = dma_addr;
194 nn->bpf_offload_skip_sw = !!(tc_flags & TCA_CLS_FLAGS_SKIP_SW);
197 bpf_addr |= NFP_NET_CFG_BPF_CFG_8CTX;
199 nn_writew(nn, NFP_NET_CFG_BPF_SIZE, n_instr);
200 nn_writeq(nn, NFP_NET_CFG_BPF_ADDR, bpf_addr);
202 /* Load up the JITed code */
203 err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_BPF);
205 nn_err(nn, "FW command error while loading BPF: %d\n", err);
207 /* Enable passing packets through BPF function */
208 nn->ctrl |= NFP_NET_CFG_CTRL_BPF;
209 nn_writel(nn, NFP_NET_CFG_CTRL, nn->ctrl);
210 err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_GEN);
212 nn_err(nn, "FW command error while enabling BPF: %d\n", err);
214 dma_free_coherent(&nn->pdev->dev, code_sz, code, dma_addr);
216 nfp_net_bpf_stats_reset(nn);
217 mod_timer(&nn->rx_filter_stats_timer, jiffies + NFP_NET_STAT_POLL_IVL);
220 static int nfp_net_bpf_stop(struct nfp_net *nn)
222 if (!(nn->ctrl & NFP_NET_CFG_CTRL_BPF))
225 spin_lock_bh(&nn->rx_filter_lock);
226 nn->ctrl &= ~NFP_NET_CFG_CTRL_BPF;
227 spin_unlock_bh(&nn->rx_filter_lock);
228 nn_writel(nn, NFP_NET_CFG_CTRL, nn->ctrl);
230 del_timer_sync(&nn->rx_filter_stats_timer);
231 nn->bpf_offload_skip_sw = 0;
233 return nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_GEN);
237 nfp_net_bpf_offload(struct nfp_net *nn, u32 handle, __be16 proto,
238 struct tc_cls_bpf_offload *cls_bpf)
240 struct nfp_bpf_result res;
246 max_instr = nn_readw(nn, NFP_NET_CFG_BPF_MAX_LEN);
248 switch (cls_bpf->command) {
249 case TC_CLSBPF_REPLACE:
250 /* There is nothing stopping us from implementing seamless
251 * replace but the simple method of loading I adopted in
252 * the firmware does not handle atomic replace (i.e. we have to
253 * stop the BPF offload and re-enable it). Leaking-in a few
254 * frames which didn't have BPF applied in the hardware should
255 * be fine if software fallback is available, though.
257 if (nn->bpf_offload_skip_sw)
260 err = nfp_net_bpf_offload_prepare(nn, cls_bpf, &res, &code,
261 &dma_addr, max_instr);
265 nfp_net_bpf_stop(nn);
266 nfp_net_bpf_load_and_start(nn, cls_bpf->gen_flags, code,
267 dma_addr, max_instr * sizeof(u64),
268 res.n_instr, res.dense_mode);
272 if (nn->ctrl & NFP_NET_CFG_CTRL_BPF)
275 err = nfp_net_bpf_offload_prepare(nn, cls_bpf, &res, &code,
276 &dma_addr, max_instr);
280 nfp_net_bpf_load_and_start(nn, cls_bpf->gen_flags, code,
281 dma_addr, max_instr * sizeof(u64),
282 res.n_instr, res.dense_mode);
285 case TC_CLSBPF_DESTROY:
286 return nfp_net_bpf_stop(nn);
288 case TC_CLSBPF_STATS:
289 return nfp_net_bpf_stats_update(nn, cls_bpf);