![Denis Kirjanov](/assets/img/avatar_default.png)
Use kfree_skb for skb pointers Acked-by: Dimitris Michailidis <dm@chelsio.com> Signed-off-by: Denis Kirjanov <dkirjanov@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
632 lines
16 KiB
C
632 lines
16 KiB
C
/*
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* This file is part of the Chelsio T4 Ethernet driver for Linux.
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*
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* Copyright (c) 2003-2010 Chelsio Communications, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/if.h>
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#include <linux/if_vlan.h>
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#include <linux/jhash.h>
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#include <net/neighbour.h>
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#include "cxgb4.h"
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#include "l2t.h"
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#include "t4_msg.h"
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#include "t4fw_api.h"
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#define VLAN_NONE 0xfff
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/* identifies sync vs async L2T_WRITE_REQs */
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#define F_SYNC_WR (1 << 12)
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enum {
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L2T_STATE_VALID, /* entry is up to date */
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L2T_STATE_STALE, /* entry may be used but needs revalidation */
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L2T_STATE_RESOLVING, /* entry needs address resolution */
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L2T_STATE_SYNC_WRITE, /* synchronous write of entry underway */
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/* when state is one of the below the entry is not hashed */
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L2T_STATE_SWITCHING, /* entry is being used by a switching filter */
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L2T_STATE_UNUSED /* entry not in use */
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};
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struct l2t_data {
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rwlock_t lock;
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atomic_t nfree; /* number of free entries */
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struct l2t_entry *rover; /* starting point for next allocation */
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struct l2t_entry l2tab[L2T_SIZE];
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};
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static inline unsigned int vlan_prio(const struct l2t_entry *e)
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{
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return e->vlan >> 13;
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}
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static inline void l2t_hold(struct l2t_data *d, struct l2t_entry *e)
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{
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if (atomic_add_return(1, &e->refcnt) == 1) /* 0 -> 1 transition */
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atomic_dec(&d->nfree);
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}
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/*
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* To avoid having to check address families we do not allow v4 and v6
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* neighbors to be on the same hash chain. We keep v4 entries in the first
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* half of available hash buckets and v6 in the second.
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*/
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enum {
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L2T_SZ_HALF = L2T_SIZE / 2,
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L2T_HASH_MASK = L2T_SZ_HALF - 1
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};
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static inline unsigned int arp_hash(const u32 *key, int ifindex)
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{
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return jhash_2words(*key, ifindex, 0) & L2T_HASH_MASK;
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}
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static inline unsigned int ipv6_hash(const u32 *key, int ifindex)
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{
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u32 xor = key[0] ^ key[1] ^ key[2] ^ key[3];
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return L2T_SZ_HALF + (jhash_2words(xor, ifindex, 0) & L2T_HASH_MASK);
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}
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static unsigned int addr_hash(const u32 *addr, int addr_len, int ifindex)
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{
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return addr_len == 4 ? arp_hash(addr, ifindex) :
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ipv6_hash(addr, ifindex);
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}
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/*
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* Checks if an L2T entry is for the given IP/IPv6 address. It does not check
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* whether the L2T entry and the address are of the same address family.
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* Callers ensure an address is only checked against L2T entries of the same
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* family, something made trivial by the separation of IP and IPv6 hash chains
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* mentioned above. Returns 0 if there's a match,
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*/
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static int addreq(const struct l2t_entry *e, const u32 *addr)
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{
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if (e->v6)
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return (e->addr[0] ^ addr[0]) | (e->addr[1] ^ addr[1]) |
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(e->addr[2] ^ addr[2]) | (e->addr[3] ^ addr[3]);
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return e->addr[0] ^ addr[0];
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}
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static void neigh_replace(struct l2t_entry *e, struct neighbour *n)
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{
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neigh_hold(n);
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if (e->neigh)
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neigh_release(e->neigh);
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e->neigh = n;
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}
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/*
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* Write an L2T entry. Must be called with the entry locked.
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* The write may be synchronous or asynchronous.
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*/
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static int write_l2e(struct adapter *adap, struct l2t_entry *e, int sync)
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{
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struct sk_buff *skb;
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struct cpl_l2t_write_req *req;
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skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
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if (!skb)
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return -ENOMEM;
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req = (struct cpl_l2t_write_req *)__skb_put(skb, sizeof(*req));
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INIT_TP_WR(req, 0);
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OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_L2T_WRITE_REQ,
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e->idx | (sync ? F_SYNC_WR : 0) |
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TID_QID(adap->sge.fw_evtq.abs_id)));
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req->params = htons(L2T_W_PORT(e->lport) | L2T_W_NOREPLY(!sync));
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req->l2t_idx = htons(e->idx);
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req->vlan = htons(e->vlan);
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if (e->neigh)
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memcpy(e->dmac, e->neigh->ha, sizeof(e->dmac));
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memcpy(req->dst_mac, e->dmac, sizeof(req->dst_mac));
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set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);
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t4_ofld_send(adap, skb);
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if (sync && e->state != L2T_STATE_SWITCHING)
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e->state = L2T_STATE_SYNC_WRITE;
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return 0;
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}
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/*
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* Send packets waiting in an L2T entry's ARP queue. Must be called with the
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* entry locked.
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*/
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static void send_pending(struct adapter *adap, struct l2t_entry *e)
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{
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while (e->arpq_head) {
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struct sk_buff *skb = e->arpq_head;
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e->arpq_head = skb->next;
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skb->next = NULL;
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t4_ofld_send(adap, skb);
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}
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e->arpq_tail = NULL;
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}
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/*
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* Process a CPL_L2T_WRITE_RPL. Wake up the ARP queue if it completes a
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* synchronous L2T_WRITE. Note that the TID in the reply is really the L2T
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* index it refers to.
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*/
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void do_l2t_write_rpl(struct adapter *adap, const struct cpl_l2t_write_rpl *rpl)
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{
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unsigned int tid = GET_TID(rpl);
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unsigned int idx = tid & (L2T_SIZE - 1);
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if (unlikely(rpl->status != CPL_ERR_NONE)) {
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dev_err(adap->pdev_dev,
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"Unexpected L2T_WRITE_RPL status %u for entry %u\n",
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rpl->status, idx);
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return;
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}
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if (tid & F_SYNC_WR) {
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struct l2t_entry *e = &adap->l2t->l2tab[idx];
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spin_lock(&e->lock);
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if (e->state != L2T_STATE_SWITCHING) {
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send_pending(adap, e);
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e->state = (e->neigh->nud_state & NUD_STALE) ?
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L2T_STATE_STALE : L2T_STATE_VALID;
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}
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spin_unlock(&e->lock);
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}
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}
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/*
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* Add a packet to an L2T entry's queue of packets awaiting resolution.
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* Must be called with the entry's lock held.
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*/
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static inline void arpq_enqueue(struct l2t_entry *e, struct sk_buff *skb)
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{
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skb->next = NULL;
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if (e->arpq_head)
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e->arpq_tail->next = skb;
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else
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e->arpq_head = skb;
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e->arpq_tail = skb;
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}
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int cxgb4_l2t_send(struct net_device *dev, struct sk_buff *skb,
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struct l2t_entry *e)
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{
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struct adapter *adap = netdev2adap(dev);
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again:
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switch (e->state) {
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case L2T_STATE_STALE: /* entry is stale, kick off revalidation */
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neigh_event_send(e->neigh, NULL);
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spin_lock_bh(&e->lock);
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if (e->state == L2T_STATE_STALE)
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e->state = L2T_STATE_VALID;
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spin_unlock_bh(&e->lock);
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case L2T_STATE_VALID: /* fast-path, send the packet on */
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return t4_ofld_send(adap, skb);
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case L2T_STATE_RESOLVING:
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case L2T_STATE_SYNC_WRITE:
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spin_lock_bh(&e->lock);
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if (e->state != L2T_STATE_SYNC_WRITE &&
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e->state != L2T_STATE_RESOLVING) {
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spin_unlock_bh(&e->lock);
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goto again;
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}
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arpq_enqueue(e, skb);
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spin_unlock_bh(&e->lock);
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if (e->state == L2T_STATE_RESOLVING &&
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!neigh_event_send(e->neigh, NULL)) {
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spin_lock_bh(&e->lock);
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if (e->state == L2T_STATE_RESOLVING && e->arpq_head)
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write_l2e(adap, e, 1);
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spin_unlock_bh(&e->lock);
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}
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}
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return 0;
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}
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EXPORT_SYMBOL(cxgb4_l2t_send);
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/*
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* Allocate a free L2T entry. Must be called with l2t_data.lock held.
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*/
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static struct l2t_entry *alloc_l2e(struct l2t_data *d)
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{
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struct l2t_entry *end, *e, **p;
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if (!atomic_read(&d->nfree))
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return NULL;
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/* there's definitely a free entry */
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for (e = d->rover, end = &d->l2tab[L2T_SIZE]; e != end; ++e)
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if (atomic_read(&e->refcnt) == 0)
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goto found;
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for (e = d->l2tab; atomic_read(&e->refcnt); ++e)
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;
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found:
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d->rover = e + 1;
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atomic_dec(&d->nfree);
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/*
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* The entry we found may be an inactive entry that is
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* presently in the hash table. We need to remove it.
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*/
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if (e->state < L2T_STATE_SWITCHING)
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for (p = &d->l2tab[e->hash].first; *p; p = &(*p)->next)
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if (*p == e) {
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*p = e->next;
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e->next = NULL;
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break;
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}
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e->state = L2T_STATE_UNUSED;
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return e;
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}
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/*
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* Called when an L2T entry has no more users.
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*/
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static void t4_l2e_free(struct l2t_entry *e)
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{
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struct l2t_data *d;
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spin_lock_bh(&e->lock);
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if (atomic_read(&e->refcnt) == 0) { /* hasn't been recycled */
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if (e->neigh) {
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neigh_release(e->neigh);
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e->neigh = NULL;
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}
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while (e->arpq_head) {
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struct sk_buff *skb = e->arpq_head;
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e->arpq_head = skb->next;
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kfree_skb(skb);
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}
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e->arpq_tail = NULL;
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}
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spin_unlock_bh(&e->lock);
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d = container_of(e, struct l2t_data, l2tab[e->idx]);
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atomic_inc(&d->nfree);
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}
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void cxgb4_l2t_release(struct l2t_entry *e)
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{
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if (atomic_dec_and_test(&e->refcnt))
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t4_l2e_free(e);
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}
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EXPORT_SYMBOL(cxgb4_l2t_release);
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/*
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* Update an L2T entry that was previously used for the same next hop as neigh.
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* Must be called with softirqs disabled.
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*/
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static void reuse_entry(struct l2t_entry *e, struct neighbour *neigh)
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{
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unsigned int nud_state;
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spin_lock(&e->lock); /* avoid race with t4_l2t_free */
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if (neigh != e->neigh)
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neigh_replace(e, neigh);
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nud_state = neigh->nud_state;
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if (memcmp(e->dmac, neigh->ha, sizeof(e->dmac)) ||
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!(nud_state & NUD_VALID))
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e->state = L2T_STATE_RESOLVING;
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else if (nud_state & NUD_CONNECTED)
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e->state = L2T_STATE_VALID;
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else
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e->state = L2T_STATE_STALE;
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spin_unlock(&e->lock);
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}
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struct l2t_entry *cxgb4_l2t_get(struct l2t_data *d, struct neighbour *neigh,
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const struct net_device *physdev,
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unsigned int priority)
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{
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u8 lport;
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u16 vlan;
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struct l2t_entry *e;
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int addr_len = neigh->tbl->key_len;
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u32 *addr = (u32 *)neigh->primary_key;
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int ifidx = neigh->dev->ifindex;
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int hash = addr_hash(addr, addr_len, ifidx);
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if (neigh->dev->flags & IFF_LOOPBACK)
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lport = netdev2pinfo(physdev)->tx_chan + 4;
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else
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lport = netdev2pinfo(physdev)->lport;
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if (neigh->dev->priv_flags & IFF_802_1Q_VLAN)
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vlan = vlan_dev_vlan_id(neigh->dev);
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else
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vlan = VLAN_NONE;
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write_lock_bh(&d->lock);
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for (e = d->l2tab[hash].first; e; e = e->next)
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if (!addreq(e, addr) && e->ifindex == ifidx &&
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e->vlan == vlan && e->lport == lport) {
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l2t_hold(d, e);
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if (atomic_read(&e->refcnt) == 1)
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reuse_entry(e, neigh);
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goto done;
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}
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/* Need to allocate a new entry */
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e = alloc_l2e(d);
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if (e) {
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spin_lock(&e->lock); /* avoid race with t4_l2t_free */
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e->state = L2T_STATE_RESOLVING;
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memcpy(e->addr, addr, addr_len);
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e->ifindex = ifidx;
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e->hash = hash;
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e->lport = lport;
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e->v6 = addr_len == 16;
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atomic_set(&e->refcnt, 1);
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neigh_replace(e, neigh);
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e->vlan = vlan;
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e->next = d->l2tab[hash].first;
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d->l2tab[hash].first = e;
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spin_unlock(&e->lock);
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}
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done:
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write_unlock_bh(&d->lock);
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return e;
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}
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EXPORT_SYMBOL(cxgb4_l2t_get);
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/*
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* Called when address resolution fails for an L2T entry to handle packets
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* on the arpq head. If a packet specifies a failure handler it is invoked,
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* otherwise the packet is sent to the device.
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*/
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static void handle_failed_resolution(struct adapter *adap, struct sk_buff *arpq)
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{
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while (arpq) {
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struct sk_buff *skb = arpq;
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const struct l2t_skb_cb *cb = L2T_SKB_CB(skb);
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arpq = skb->next;
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skb->next = NULL;
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if (cb->arp_err_handler)
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cb->arp_err_handler(cb->handle, skb);
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else
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t4_ofld_send(adap, skb);
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}
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}
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/*
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* Called when the host's neighbor layer makes a change to some entry that is
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* loaded into the HW L2 table.
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*/
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void t4_l2t_update(struct adapter *adap, struct neighbour *neigh)
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{
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struct l2t_entry *e;
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struct sk_buff *arpq = NULL;
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struct l2t_data *d = adap->l2t;
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int addr_len = neigh->tbl->key_len;
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u32 *addr = (u32 *) neigh->primary_key;
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int ifidx = neigh->dev->ifindex;
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int hash = addr_hash(addr, addr_len, ifidx);
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read_lock_bh(&d->lock);
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for (e = d->l2tab[hash].first; e; e = e->next)
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if (!addreq(e, addr) && e->ifindex == ifidx) {
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spin_lock(&e->lock);
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if (atomic_read(&e->refcnt))
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goto found;
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spin_unlock(&e->lock);
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break;
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}
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read_unlock_bh(&d->lock);
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return;
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found:
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read_unlock(&d->lock);
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if (neigh != e->neigh)
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neigh_replace(e, neigh);
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if (e->state == L2T_STATE_RESOLVING) {
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if (neigh->nud_state & NUD_FAILED) {
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arpq = e->arpq_head;
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e->arpq_head = e->arpq_tail = NULL;
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} else if ((neigh->nud_state & (NUD_CONNECTED | NUD_STALE)) &&
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e->arpq_head) {
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write_l2e(adap, e, 1);
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}
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} else {
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e->state = neigh->nud_state & NUD_CONNECTED ?
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L2T_STATE_VALID : L2T_STATE_STALE;
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if (memcmp(e->dmac, neigh->ha, sizeof(e->dmac)))
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write_l2e(adap, e, 0);
|
|
}
|
|
|
|
spin_unlock_bh(&e->lock);
|
|
|
|
if (arpq)
|
|
handle_failed_resolution(adap, arpq);
|
|
}
|
|
|
|
/*
|
|
* Allocate an L2T entry for use by a switching rule. Such entries need to be
|
|
* explicitly freed and while busy they are not on any hash chain, so normal
|
|
* address resolution updates do not see them.
|
|
*/
|
|
struct l2t_entry *t4_l2t_alloc_switching(struct l2t_data *d)
|
|
{
|
|
struct l2t_entry *e;
|
|
|
|
write_lock_bh(&d->lock);
|
|
e = alloc_l2e(d);
|
|
if (e) {
|
|
spin_lock(&e->lock); /* avoid race with t4_l2t_free */
|
|
e->state = L2T_STATE_SWITCHING;
|
|
atomic_set(&e->refcnt, 1);
|
|
spin_unlock(&e->lock);
|
|
}
|
|
write_unlock_bh(&d->lock);
|
|
return e;
|
|
}
|
|
|
|
/*
|
|
* Sets/updates the contents of a switching L2T entry that has been allocated
|
|
* with an earlier call to @t4_l2t_alloc_switching.
|
|
*/
|
|
int t4_l2t_set_switching(struct adapter *adap, struct l2t_entry *e, u16 vlan,
|
|
u8 port, u8 *eth_addr)
|
|
{
|
|
e->vlan = vlan;
|
|
e->lport = port;
|
|
memcpy(e->dmac, eth_addr, ETH_ALEN);
|
|
return write_l2e(adap, e, 0);
|
|
}
|
|
|
|
struct l2t_data *t4_init_l2t(void)
|
|
{
|
|
int i;
|
|
struct l2t_data *d;
|
|
|
|
d = t4_alloc_mem(sizeof(*d));
|
|
if (!d)
|
|
return NULL;
|
|
|
|
d->rover = d->l2tab;
|
|
atomic_set(&d->nfree, L2T_SIZE);
|
|
rwlock_init(&d->lock);
|
|
|
|
for (i = 0; i < L2T_SIZE; ++i) {
|
|
d->l2tab[i].idx = i;
|
|
d->l2tab[i].state = L2T_STATE_UNUSED;
|
|
spin_lock_init(&d->l2tab[i].lock);
|
|
atomic_set(&d->l2tab[i].refcnt, 0);
|
|
}
|
|
return d;
|
|
}
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
static inline void *l2t_get_idx(struct seq_file *seq, loff_t pos)
|
|
{
|
|
struct l2t_entry *l2tab = seq->private;
|
|
|
|
return pos >= L2T_SIZE ? NULL : &l2tab[pos];
|
|
}
|
|
|
|
static void *l2t_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
return *pos ? l2t_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
|
|
}
|
|
|
|
static void *l2t_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
v = l2t_get_idx(seq, *pos);
|
|
if (v)
|
|
++*pos;
|
|
return v;
|
|
}
|
|
|
|
static void l2t_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
}
|
|
|
|
static char l2e_state(const struct l2t_entry *e)
|
|
{
|
|
switch (e->state) {
|
|
case L2T_STATE_VALID: return 'V';
|
|
case L2T_STATE_STALE: return 'S';
|
|
case L2T_STATE_SYNC_WRITE: return 'W';
|
|
case L2T_STATE_RESOLVING: return e->arpq_head ? 'A' : 'R';
|
|
case L2T_STATE_SWITCHING: return 'X';
|
|
default:
|
|
return 'U';
|
|
}
|
|
}
|
|
|
|
static int l2t_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_puts(seq, " Idx IP address "
|
|
"Ethernet address VLAN/P LP State Users Port\n");
|
|
else {
|
|
char ip[60];
|
|
struct l2t_entry *e = v;
|
|
|
|
spin_lock_bh(&e->lock);
|
|
if (e->state == L2T_STATE_SWITCHING)
|
|
ip[0] = '\0';
|
|
else
|
|
sprintf(ip, e->v6 ? "%pI6c" : "%pI4", e->addr);
|
|
seq_printf(seq, "%4u %-25s %17pM %4d %u %2u %c %5u %s\n",
|
|
e->idx, ip, e->dmac,
|
|
e->vlan & VLAN_VID_MASK, vlan_prio(e), e->lport,
|
|
l2e_state(e), atomic_read(&e->refcnt),
|
|
e->neigh ? e->neigh->dev->name : "");
|
|
spin_unlock_bh(&e->lock);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations l2t_seq_ops = {
|
|
.start = l2t_seq_start,
|
|
.next = l2t_seq_next,
|
|
.stop = l2t_seq_stop,
|
|
.show = l2t_seq_show
|
|
};
|
|
|
|
static int l2t_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
int rc = seq_open(file, &l2t_seq_ops);
|
|
|
|
if (!rc) {
|
|
struct adapter *adap = inode->i_private;
|
|
struct seq_file *seq = file->private_data;
|
|
|
|
seq->private = adap->l2t->l2tab;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
const struct file_operations t4_l2t_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = l2t_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|