1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011 Chelsio Communications, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 * 30 */ 31 32 #ifndef __T4_L2T_H 33 #define __T4_L2T_H 34 35 /* identifies sync vs async L2T_WRITE_REQs */ 36 #define S_SYNC_WR 12 37 #define V_SYNC_WR(x) ((x) << S_SYNC_WR) 38 #define F_SYNC_WR V_SYNC_WR(1) 39 40 enum { L2T_SIZE = 4096 }; /* # of L2T entries */ 41 42 enum { 43 L2T_STATE_VALID, /* entry is up to date */ 44 L2T_STATE_STALE, /* entry may be used but needs revalidation */ 45 L2T_STATE_RESOLVING, /* entry needs address resolution */ 46 L2T_STATE_FAILED, /* failed to resolve */ 47 L2T_STATE_SYNC_WRITE, /* synchronous write of entry underway */ 48 49 /* when state is one of the below the entry is not hashed */ 50 L2T_STATE_SWITCHING, /* entry is being used by a switching filter */ 51 L2T_STATE_UNUSED /* entry not in use */ 52 }; 53 54 /* 55 * Each L2T entry plays multiple roles. First of all, it keeps state for the 56 * corresponding entry of the HW L2 table and maintains a queue of offload 57 * packets awaiting address resolution. Second, it is a node of a hash table 58 * chain, where the nodes of the chain are linked together through their next 59 * pointer. Finally, each node is a bucket of a hash table, pointing to the 60 * first element in its chain through its first pointer. 61 */ 62 struct l2t_entry { 63 uint16_t state; /* entry state */ 64 uint16_t idx; /* entry index */ 65 uint32_t addr[4]; /* next hop IP or IPv6 address */ 66 uint32_t iqid; /* iqid for reply to write_l2e */ 67 struct sge_wrq *wrq; /* queue to use for write_l2e */ 68 struct ifnet *ifp; /* outgoing interface */ 69 uint16_t smt_idx; /* SMT index */ 70 uint16_t vlan; /* VLAN TCI (id: 0-11, prio: 13-15) */ 71 struct l2t_entry *first; /* start of hash chain */ 72 struct l2t_entry *next; /* next l2t_entry on chain */ 73 STAILQ_HEAD(, wrqe) wr_list; /* list of WRs awaiting resolution */ 74 struct mtx lock; 75 volatile int refcnt; /* entry reference count */ 76 uint16_t hash; /* hash bucket the entry is on */ 77 uint8_t ipv6; /* entry is for an IPv6 address */ 78 uint8_t lport; /* associated offload logical port */ 79 uint8_t dmac[ETHER_ADDR_LEN]; /* next hop's MAC address */ 80 }; 81 82 struct l2t_data { 83 struct rwlock lock; 84 u_int l2t_size; 85 volatile int nfree; /* number of free entries */ 86 struct l2t_entry *rover;/* starting point for next allocation */ 87 struct l2t_entry l2tab[]; 88 }; 89 90 91 int t4_init_l2t(struct adapter *, int); 92 int t4_free_l2t(struct l2t_data *); 93 struct l2t_entry *t4_alloc_l2e(struct l2t_data *); 94 struct l2t_entry *t4_l2t_alloc_switching(struct l2t_data *); 95 int t4_l2t_set_switching(struct adapter *, struct l2t_entry *, uint16_t, 96 uint8_t, uint8_t *); 97 int t4_write_l2e(struct l2t_entry *, int); 98 int do_l2t_write_rpl(struct sge_iq *, const struct rss_header *, struct mbuf *); 99 100 static inline void 101 t4_l2t_release(struct l2t_entry *e) 102 { 103 struct l2t_data *d = __containerof(e, struct l2t_data, l2tab[e->idx]); 104 105 if (atomic_fetchadd_int(&e->refcnt, -1) == 1) 106 atomic_add_int(&d->nfree, 1); 107 } 108 109 int sysctl_l2t(SYSCTL_HANDLER_ARGS); 110 111 #endif /* __T4_L2T_H */ 112