1 /*- 2 * Copyright (c) 2011 Chelsio Communications, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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. 13 * 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 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 * 28 */ 29 30 #ifndef __T4_L2T_H 31 #define __T4_L2T_H 32 33 /* identifies sync vs async L2T_WRITE_REQs */ 34 #define S_SYNC_WR 12 35 #define V_SYNC_WR(x) ((x) << S_SYNC_WR) 36 #define F_SYNC_WR V_SYNC_WR(1) 37 38 enum { L2T_SIZE = 4096 }; /* # of L2T entries */ 39 40 enum { 41 L2T_STATE_VALID, /* entry is up to date */ 42 L2T_STATE_STALE, /* entry may be used but needs revalidation */ 43 L2T_STATE_RESOLVING, /* entry needs address resolution */ 44 L2T_STATE_FAILED, /* failed to resolve */ 45 L2T_STATE_SYNC_WRITE, /* synchronous write of entry underway */ 46 47 /* when state is one of the below the entry is not hashed */ 48 L2T_STATE_SWITCHING, /* entry is being used by a switching filter */ 49 L2T_STATE_UNUSED /* entry not in use */ 50 }; 51 52 /* 53 * Each L2T entry plays multiple roles. First of all, it keeps state for the 54 * corresponding entry of the HW L2 table and maintains a queue of offload 55 * packets awaiting address resolution. Second, it is a node of a hash table 56 * chain, where the nodes of the chain are linked together through their next 57 * pointer. Finally, each node is a bucket of a hash table, pointing to the 58 * first element in its chain through its first pointer. 59 */ 60 struct l2t_entry { 61 uint16_t state; /* entry state */ 62 uint16_t idx; /* entry index */ 63 uint32_t addr; /* next hop IP address */ 64 struct ifnet *ifp; /* outgoing interface */ 65 uint16_t smt_idx; /* SMT index */ 66 uint16_t vlan; /* VLAN TCI (id: 0-11, prio: 13-15) */ 67 struct l2t_entry *first; /* start of hash chain */ 68 struct l2t_entry *next; /* next l2t_entry on chain */ 69 STAILQ_HEAD(, wrqe) wr_list; /* list of WRs awaiting resolution */ 70 struct mtx lock; 71 volatile int refcnt; /* entry reference count */ 72 uint16_t hash; /* hash bucket the entry is on */ 73 uint8_t lport; /* associated offload logical port */ 74 uint8_t dmac[ETHER_ADDR_LEN]; /* next hop's MAC address */ 75 }; 76 77 struct l2t_data { 78 struct rwlock lock; 79 volatile int nfree; /* number of free entries */ 80 struct l2t_entry *rover;/* starting point for next allocation */ 81 struct l2t_entry l2tab[L2T_SIZE]; 82 }; 83 84 85 int t4_init_l2t(struct adapter *, int); 86 int t4_free_l2t(struct l2t_data *); 87 struct l2t_entry *t4_alloc_l2e(struct l2t_data *); 88 struct l2t_entry *t4_l2t_alloc_switching(struct l2t_data *); 89 int t4_l2t_set_switching(struct adapter *, struct l2t_entry *, uint16_t, 90 uint8_t, uint8_t *); 91 int t4_write_l2e(struct adapter *, struct l2t_entry *, int); 92 int do_l2t_write_rpl(struct sge_iq *, const struct rss_header *, struct mbuf *); 93 94 static inline void 95 t4_l2t_release(struct l2t_entry *e) 96 { 97 struct l2t_data *d = __containerof(e, struct l2t_data, l2tab[e->idx]); 98 99 if (atomic_fetchadd_int(&e->refcnt, -1) == 1) 100 atomic_add_int(&d->nfree, 1); 101 } 102 103 104 #ifdef SBUF_DRAIN 105 int sysctl_l2t(SYSCTL_HANDLER_ARGS); 106 #endif 107 108 #endif /* __T4_L2T_H */ 109