2 * Copyright (c) 2012 Chelsio Communications, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
30 #include "opt_inet6.h"
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/module.h>
38 #include <sys/mutex.h>
39 #include <sys/rwlock.h>
40 #include <sys/socket.h>
42 #include <netinet/in.h>
44 #include "common/common.h"
45 #include "common/jhash.h"
46 #include "common/t4_msg.h"
50 * Module locking notes: There is a RW lock protecting the L2 table as a
51 * whole plus a spinlock per L2T entry. Entry lookups and allocations happen
52 * under the protection of the table lock, individual entry changes happen
53 * while holding that entry's spinlock. The table lock nests outside the
54 * entry locks. Allocations of new entries take the table lock as writers so
55 * no other lookups can happen while allocating new entries. Entry updates
56 * take the table lock as readers so multiple entries can be updated in
57 * parallel. An L2T entry can be dropped by decrementing its reference count
58 * and therefore can happen in parallel with entry allocation but no entry
59 * can change state or increment its ref count during allocation as both of
60 * these perform lookups.
62 * Note: We do not take refereces to ifnets in this module because both
63 * the TOE and the sockets already hold references to the interfaces and the
64 * lifetime of an L2T entry is fully contained in the lifetime of the TOE.
68 * Allocate a free L2T entry. Must be called with l2t_data.lock held.
71 t4_alloc_l2e(struct l2t_data *d)
73 struct l2t_entry *end, *e, **p;
75 rw_assert(&d->lock, RA_WLOCKED);
77 if (!atomic_load_acq_int(&d->nfree))
80 /* there's definitely a free entry */
81 for (e = d->rover, end = &d->l2tab[L2T_SIZE]; e != end; ++e)
82 if (atomic_load_acq_int(&e->refcnt) == 0)
85 for (e = d->l2tab; atomic_load_acq_int(&e->refcnt); ++e)
89 atomic_subtract_int(&d->nfree, 1);
92 * The entry we found may be an inactive entry that is
93 * presently in the hash table. We need to remove it.
95 if (e->state < L2T_STATE_SWITCHING) {
96 for (p = &d->l2tab[e->hash].first; *p; p = &(*p)->next) {
105 e->state = L2T_STATE_UNUSED;
110 * Write an L2T entry. Must be called with the entry locked.
111 * The write may be synchronous or asynchronous.
114 t4_write_l2e(struct adapter *sc, struct l2t_entry *e, int sync)
117 struct cpl_l2t_write_req *req;
119 mtx_assert(&e->lock, MA_OWNED);
121 wr = alloc_wrqe(sizeof(*req), &sc->sge.mgmtq);
127 OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_L2T_WRITE_REQ, e->idx |
128 V_SYNC_WR(sync) | V_TID_QID(sc->sge.fwq.abs_id)));
129 req->params = htons(V_L2T_W_PORT(e->lport) | V_L2T_W_NOREPLY(!sync));
130 req->l2t_idx = htons(e->idx);
131 req->vlan = htons(e->vlan);
132 memcpy(req->dst_mac, e->dmac, sizeof(req->dst_mac));
136 if (sync && e->state != L2T_STATE_SWITCHING)
137 e->state = L2T_STATE_SYNC_WRITE;
143 * Allocate an L2T entry for use by a switching rule. Such need to be
144 * explicitly freed and while busy they are not on any hash chain, so normal
145 * address resolution updates do not see them.
148 t4_l2t_alloc_switching(struct l2t_data *d)
155 mtx_lock(&e->lock); /* avoid race with t4_l2t_free */
156 e->state = L2T_STATE_SWITCHING;
157 atomic_store_rel_int(&e->refcnt, 1);
158 mtx_unlock(&e->lock);
160 rw_runlock(&d->lock);
165 * Sets/updates the contents of a switching L2T entry that has been allocated
166 * with an earlier call to @t4_l2t_alloc_switching.
169 t4_l2t_set_switching(struct adapter *sc, struct l2t_entry *e, uint16_t vlan,
170 uint8_t port, uint8_t *eth_addr)
176 memcpy(e->dmac, eth_addr, ETHER_ADDR_LEN);
178 rc = t4_write_l2e(sc, e, 0);
179 mtx_unlock(&e->lock);
184 t4_init_l2t(struct adapter *sc, int flags)
189 d = malloc(sizeof(*d), M_CXGBE, M_ZERO | flags);
194 atomic_store_rel_int(&d->nfree, L2T_SIZE);
195 rw_init(&d->lock, "L2T");
197 for (i = 0; i < L2T_SIZE; i++) {
198 struct l2t_entry *e = &d->l2tab[i];
201 e->state = L2T_STATE_UNUSED;
202 mtx_init(&e->lock, "L2T_E", NULL, MTX_DEF);
203 STAILQ_INIT(&e->wr_list);
204 atomic_store_rel_int(&e->refcnt, 0);
208 t4_register_cpl_handler(sc, CPL_L2T_WRITE_RPL, do_l2t_write_rpl);
214 t4_free_l2t(struct l2t_data *d)
218 for (i = 0; i < L2T_SIZE; i++)
219 mtx_destroy(&d->l2tab[i].lock);
220 rw_destroy(&d->lock);
227 do_l2t_write_rpl(struct sge_iq *iq, const struct rss_header *rss,
230 const struct cpl_l2t_write_rpl *rpl = (const void *)(rss + 1);
231 unsigned int tid = GET_TID(rpl);
232 unsigned int idx = tid & (L2T_SIZE - 1);
234 if (__predict_false(rpl->status != CPL_ERR_NONE)) {
236 "Unexpected L2T_WRITE_RPL status %u for entry %u\n",
245 static inline unsigned int
246 vlan_prio(const struct l2t_entry *e)
248 return e->vlan >> 13;
252 l2e_state(const struct l2t_entry *e)
255 case L2T_STATE_VALID: return 'V'; /* valid, fast-path entry */
256 case L2T_STATE_STALE: return 'S'; /* needs revalidation, but usable */
257 case L2T_STATE_SYNC_WRITE: return 'W';
258 case L2T_STATE_RESOLVING: return STAILQ_EMPTY(&e->wr_list) ? 'R' : 'A';
259 case L2T_STATE_SWITCHING: return 'X';
265 sysctl_l2t(SYSCTL_HANDLER_ARGS)
267 struct adapter *sc = arg1;
268 struct l2t_data *l2t = sc->l2t;
271 int rc, i, header = 0;
277 rc = sysctl_wire_old_buffer(req, 0);
281 sb = sbuf_new_for_sysctl(NULL, NULL, 4096, req);
286 for (i = 0; i < L2T_SIZE; i++, e++) {
288 if (e->state == L2T_STATE_UNUSED)
292 sbuf_printf(sb, " Idx IP address "
293 "Ethernet address VLAN/P LP State Users Port");
296 if (e->state == L2T_STATE_SWITCHING)
299 snprintf(ip, sizeof(ip), "%s",
300 inet_ntoa(*(struct in_addr *)&e->addr));
302 /* XXX: e->ifp may not be around */
303 sbuf_printf(sb, "\n%4u %-15s %02x:%02x:%02x:%02x:%02x:%02x %4d"
305 e->idx, ip, e->dmac[0], e->dmac[1], e->dmac[2],
306 e->dmac[3], e->dmac[4], e->dmac[5],
307 e->vlan & 0xfff, vlan_prio(e), e->lport,
308 l2e_state(e), atomic_load_acq_int(&e->refcnt),
311 mtx_unlock(&e->lock);
314 rc = sbuf_finish(sb);