2 * This file is part of the Chelsio T4 Ethernet driver for Linux.
4 * Copyright (c) 2016 Chelsio Communications, Inc. All rights reserved.
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25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 #include <net/tc_act/tc_gact.h>
36 #include <net/tc_act/tc_mirred.h>
39 #include "cxgb4_filter.h"
40 #include "cxgb4_tc_u32_parse.h"
41 #include "cxgb4_tc_u32.h"
43 /* Fill ch_filter_specification with parsed match value/mask pair. */
44 static int fill_match_fields(struct adapter *adap,
45 struct ch_filter_specification *fs,
46 struct tc_cls_u32_offload *cls,
47 const struct cxgb4_match_field *entry,
55 for (i = 0; i < cls->knode.sel->nkeys; i++) {
56 off = cls->knode.sel->keys[i].off;
57 val = cls->knode.sel->keys[i].val;
58 mask = cls->knode.sel->keys[i].mask;
61 /* For next headers, parse only keys with offmask */
62 if (!cls->knode.sel->keys[i].offmask)
65 /* For the remaining, parse only keys without offmask */
66 if (cls->knode.sel->keys[i].offmask)
72 for (j = 0; entry[j].val; j++) {
73 if (off == entry[j].off) {
75 err = entry[j].val(fs, val, mask);
89 /* Fill ch_filter_specification with parsed action. */
90 static int fill_action_fields(struct adapter *adap,
91 struct ch_filter_specification *fs,
92 struct tc_cls_u32_offload *cls)
94 unsigned int num_actions = 0;
95 const struct tc_action *a;
96 struct tcf_exts *exts;
99 exts = cls->knode.exts;
100 if (!tcf_exts_has_actions(exts))
103 tcf_exts_for_each_action(i, a, exts) {
104 /* Don't allow more than one action per rule. */
108 /* Drop in hardware. */
109 if (is_tcf_gact_shot(a)) {
110 fs->action = FILTER_DROP;
115 /* Re-direct to specified port in hardware. */
116 if (is_tcf_mirred_egress_redirect(a)) {
117 struct net_device *n_dev, *target_dev;
121 target_dev = tcf_mirred_dev(a);
122 for_each_port(adap, i) {
123 n_dev = adap->port[i];
124 if (target_dev == n_dev) {
125 fs->action = FILTER_SWITCH;
132 /* Interface doesn't belong to any port of
133 * the underlying hardware.
142 /* Un-supported action. */
149 int cxgb4_config_knode(struct net_device *dev, struct tc_cls_u32_offload *cls)
151 const struct cxgb4_match_field *start, *link_start = NULL;
152 struct netlink_ext_ack *extack = cls->common.extack;
153 struct adapter *adapter = netdev2adap(dev);
154 __be16 protocol = cls->common.protocol;
155 struct ch_filter_specification fs;
156 struct cxgb4_tc_u32_table *t;
157 struct cxgb4_link *link;
158 u32 uhtid, link_uhtid;
159 bool is_ipv6 = false;
164 if (!can_tc_u32_offload(dev))
167 if (protocol != htons(ETH_P_IP) && protocol != htons(ETH_P_IPV6))
170 inet_family = (protocol == htons(ETH_P_IPV6)) ? PF_INET6 : PF_INET;
172 /* Get a free filter entry TID, where we can insert this new
173 * rule. Only insert rule if its prio doesn't conflict with
176 filter_id = cxgb4_get_free_ftid(dev, inet_family, false,
177 TC_U32_NODE(cls->knode.handle));
179 NL_SET_ERR_MSG_MOD(extack,
180 "No free LETCAM index available");
185 uhtid = TC_U32_USERHTID(cls->knode.handle);
186 link_uhtid = TC_U32_USERHTID(cls->knode.link_handle);
188 /* Ensure that uhtid is either root u32 (i.e. 0x800)
189 * or a a valid linked bucket.
191 if (uhtid != 0x800 && uhtid >= t->size)
194 /* Ensure link handle uhtid is sane, if specified. */
195 if (link_uhtid >= t->size)
198 memset(&fs, 0, sizeof(fs));
200 if (filter_id < adapter->tids.nhpftids)
202 fs.tc_prio = cls->common.prio;
203 fs.tc_cookie = cls->knode.handle;
205 if (protocol == htons(ETH_P_IPV6)) {
206 start = cxgb4_ipv6_fields;
209 start = cxgb4_ipv4_fields;
213 if (uhtid != 0x800) {
214 /* Link must exist from root node before insertion. */
215 if (!t->table[uhtid - 1].link_handle)
218 /* Link must have a valid supported next header. */
219 link_start = t->table[uhtid - 1].match_field;
224 /* Parse links and record them for subsequent jumps to valid
228 const struct cxgb4_next_header *next;
234 if (t->table[link_uhtid - 1].link_handle) {
235 dev_err(adapter->pdev_dev,
236 "Link handle exists for: 0x%x\n",
241 next = is_ipv6 ? cxgb4_ipv6_jumps : cxgb4_ipv4_jumps;
243 /* Try to find matches that allow jumps to next header. */
244 for (i = 0; next[i].jump; i++) {
245 if (next[i].sel.offoff != cls->knode.sel->offoff ||
246 next[i].sel.offshift != cls->knode.sel->offshift ||
247 next[i].sel.offmask != cls->knode.sel->offmask ||
248 next[i].sel.off != cls->knode.sel->off)
251 /* Found a possible candidate. Find a key that
252 * matches the corresponding offset, value, and
253 * mask to jump to next header.
255 for (j = 0; j < cls->knode.sel->nkeys; j++) {
256 off = cls->knode.sel->keys[j].off;
257 val = cls->knode.sel->keys[j].val;
258 mask = cls->knode.sel->keys[j].mask;
260 if (next[i].key.off == off &&
261 next[i].key.val == val &&
262 next[i].key.mask == mask) {
269 continue; /* Try next candidate. */
271 /* Candidate to jump to next header found.
272 * Translate all keys to internal specification
273 * and store them in jump table. This spec is copied
274 * later to set the actual filters.
276 ret = fill_match_fields(adapter, &fs, cls,
281 link = &t->table[link_uhtid - 1];
282 link->match_field = next[i].jump;
283 link->link_handle = cls->knode.handle;
284 memcpy(&link->fs, &fs, sizeof(fs));
288 /* No candidate found to jump to next header. */
295 /* Fill ch_filter_specification match fields to be shipped to hardware.
296 * Copy the linked spec (if any) first. And then update the spec as
299 if (uhtid != 0x800 && t->table[uhtid - 1].link_handle) {
300 /* Copy linked ch_filter_specification */
301 memcpy(&fs, &t->table[uhtid - 1].fs, sizeof(fs));
302 ret = fill_match_fields(adapter, &fs, cls,
308 ret = fill_match_fields(adapter, &fs, cls, start, false);
312 /* Fill ch_filter_specification action fields to be shipped to
315 ret = fill_action_fields(adapter, &fs, cls);
319 /* The filter spec has been completely built from the info
320 * provided from u32. We now set some default fields in the
324 /* Match only packets coming from the ingress port where this
325 * filter will be created.
327 fs.val.iport = netdev2pinfo(dev)->port_id;
330 /* Enable filter hit counts. */
333 /* Set type of filter - IPv6 or IPv4 */
334 fs.type = is_ipv6 ? 1 : 0;
337 ret = cxgb4_set_filter(dev, filter_id, &fs);
341 /* If this is a linked bucket, then set the corresponding
342 * entry in the bitmap to mark it as belonging to this linked
345 if (uhtid != 0x800 && t->table[uhtid - 1].link_handle)
346 set_bit(filter_id, t->table[uhtid - 1].tid_map);
352 int cxgb4_delete_knode(struct net_device *dev, struct tc_cls_u32_offload *cls)
354 struct adapter *adapter = netdev2adap(dev);
355 unsigned int filter_id, max_tids, i, j;
356 struct cxgb4_link *link = NULL;
357 struct cxgb4_tc_u32_table *t;
358 struct filter_entry *f;
364 if (!can_tc_u32_offload(dev))
367 /* Fetch the location to delete the filter. */
368 max_tids = adapter->tids.nhpftids + adapter->tids.nftids;
370 spin_lock_bh(&adapter->tids.ftid_lock);
372 while (filter_id < max_tids) {
373 if (filter_id < adapter->tids.nhpftids) {
375 f = &adapter->tids.hpftid_tab[i];
376 if (f->valid && f->fs.tc_cookie == cls->knode.handle) {
381 i = find_next_bit(adapter->tids.hpftid_bmap,
382 adapter->tids.nhpftids, i + 1);
383 if (i >= adapter->tids.nhpftids) {
384 filter_id = adapter->tids.nhpftids;
390 i = filter_id - adapter->tids.nhpftids;
391 f = &adapter->tids.ftid_tab[i];
392 if (f->valid && f->fs.tc_cookie == cls->knode.handle) {
397 i = find_next_bit(adapter->tids.ftid_bmap,
398 adapter->tids.nftids, i + 1);
399 if (i >= adapter->tids.nftids)
402 filter_id = i + adapter->tids.nhpftids;
408 if (CHELSIO_CHIP_VERSION(adapter->params.chip) <
415 spin_unlock_bh(&adapter->tids.ftid_lock);
421 handle = cls->knode.handle;
422 uhtid = TC_U32_USERHTID(cls->knode.handle);
424 /* Ensure that uhtid is either root u32 (i.e. 0x800)
425 * or a a valid linked bucket.
427 if (uhtid != 0x800 && uhtid >= t->size)
430 /* Delete the specified filter */
431 if (uhtid != 0x800) {
432 link = &t->table[uhtid - 1];
433 if (!link->link_handle)
436 if (!test_bit(filter_id, link->tid_map))
440 ret = cxgb4_del_filter(dev, filter_id, NULL);
445 clear_bit(filter_id, link->tid_map);
447 /* If a link is being deleted, then delete all filters
448 * associated with the link.
450 for (i = 0; i < t->size; i++) {
453 if (link->link_handle == handle) {
454 for (j = 0; j < max_tids; j++) {
455 if (!test_bit(j, link->tid_map))
458 ret = __cxgb4_del_filter(dev, j, NULL, NULL);
462 clear_bit(j, link->tid_map);
465 /* Clear the link state */
466 link->match_field = NULL;
467 link->link_handle = 0;
468 memset(&link->fs, 0, sizeof(link->fs));
477 void cxgb4_cleanup_tc_u32(struct adapter *adap)
479 struct cxgb4_tc_u32_table *t;
485 /* Free up all allocated memory. */
487 for (i = 0; i < t->size; i++) {
488 struct cxgb4_link *link = &t->table[i];
490 kvfree(link->tid_map);
492 kvfree(adap->tc_u32);
495 struct cxgb4_tc_u32_table *cxgb4_init_tc_u32(struct adapter *adap)
497 unsigned int max_tids = adap->tids.nftids + adap->tids.nhpftids;
498 struct cxgb4_tc_u32_table *t;
504 t = kvzalloc(struct_size(t, table, max_tids), GFP_KERNEL);
510 for (i = 0; i < t->size; i++) {
511 struct cxgb4_link *link = &t->table[i];
512 unsigned int bmap_size;
514 bmap_size = BITS_TO_LONGS(max_tids);
515 link->tid_map = kvcalloc(bmap_size, sizeof(unsigned long),
519 bitmap_zero(link->tid_map, max_tids);
525 for (i = 0; i < t->size; i++) {
526 struct cxgb4_link *link = &t->table[i];
527 kvfree(link->tid_map);