Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Common framework for low-level network console, dump, and debugger code |
| 3 | * |
| 4 | * Sep 8 2003 Matt Mackall <mpm@selenic.com> |
| 5 | * |
| 6 | * based on the netconsole code from: |
| 7 | * |
| 8 | * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com> |
| 9 | * Copyright (C) 2002 Red Hat, Inc. |
| 10 | */ |
| 11 | |
Joe Perches | e6ec26935 | 2012-01-29 15:50:43 +0000 | [diff] [blame] | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 13 | |
Anton Vorontsov | bff3877 | 2009-07-08 11:10:56 -0700 | [diff] [blame] | 14 | #include <linux/moduleparam.h> |
Andy Shevchenko | 4cd5773 | 2013-06-04 19:46:26 +0300 | [diff] [blame] | 15 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/netdevice.h> |
| 17 | #include <linux/etherdevice.h> |
| 18 | #include <linux/string.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 19 | #include <linux/if_arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/inetdevice.h> |
| 21 | #include <linux/inet.h> |
| 22 | #include <linux/interrupt.h> |
| 23 | #include <linux/netpoll.h> |
| 24 | #include <linux/sched.h> |
| 25 | #include <linux/delay.h> |
| 26 | #include <linux/rcupdate.h> |
| 27 | #include <linux/workqueue.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 28 | #include <linux/slab.h> |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 29 | #include <linux/export.h> |
Amerigo Wang | 689971b | 2012-08-10 01:24:49 +0000 | [diff] [blame] | 30 | #include <linux/if_vlan.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <net/tcp.h> |
| 32 | #include <net/udp.h> |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 33 | #include <net/addrconf.h> |
| 34 | #include <net/ndisc.h> |
| 35 | #include <net/ip6_checksum.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <asm/unaligned.h> |
David S. Miller | 9cbc1cb | 2009-06-15 03:02:23 -0700 | [diff] [blame] | 37 | #include <trace/events/napi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | /* |
| 40 | * We maintain a small pool of fully-sized skbs, to make sure the |
| 41 | * message gets out even in extreme OOM situations. |
| 42 | */ |
| 43 | |
| 44 | #define MAX_UDP_CHUNK 1460 |
| 45 | #define MAX_SKBS 32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 47 | static struct sk_buff_head skb_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Lai Jiangshan | 7f9421c | 2013-03-15 06:50:52 +0000 | [diff] [blame] | 49 | DEFINE_STATIC_SRCU(netpoll_srcu); |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 50 | |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 51 | #define USEC_PER_POLL 50 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Joe Perches | 6f70624 | 2012-01-29 15:50:44 +0000 | [diff] [blame] | 53 | #define MAX_SKB_SIZE \ |
| 54 | (sizeof(struct ethhdr) + \ |
| 55 | sizeof(struct iphdr) + \ |
| 56 | sizeof(struct udphdr) + \ |
| 57 | MAX_UDP_CHUNK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
David S. Miller | 3578b0c | 2010-08-03 00:24:04 -0700 | [diff] [blame] | 59 | static void zap_completion_queue(void); |
Neil Horman | 2cde6ac | 2013-02-11 10:25:30 +0000 | [diff] [blame] | 60 | static void netpoll_async_cleanup(struct work_struct *work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
Anton Vorontsov | bff3877 | 2009-07-08 11:10:56 -0700 | [diff] [blame] | 62 | static unsigned int carrier_timeout = 4; |
| 63 | module_param(carrier_timeout, uint, 0644); |
| 64 | |
Joe Perches | e6ec26935 | 2012-01-29 15:50:43 +0000 | [diff] [blame] | 65 | #define np_info(np, fmt, ...) \ |
| 66 | pr_info("%s: " fmt, np->name, ##__VA_ARGS__) |
| 67 | #define np_err(np, fmt, ...) \ |
| 68 | pr_err("%s: " fmt, np->name, ##__VA_ARGS__) |
| 69 | #define np_notice(np, fmt, ...) \ |
| 70 | pr_notice("%s: " fmt, np->name, ##__VA_ARGS__) |
| 71 | |
Eric W. Biederman | 944e294 | 2014-03-27 15:37:28 -0700 | [diff] [blame] | 72 | static int netpoll_start_xmit(struct sk_buff *skb, struct net_device *dev, |
| 73 | struct netdev_queue *txq) |
| 74 | { |
Eric W. Biederman | 944e294 | 2014-03-27 15:37:28 -0700 | [diff] [blame] | 75 | int status = NETDEV_TX_OK; |
| 76 | netdev_features_t features; |
| 77 | |
| 78 | features = netif_skb_features(skb); |
| 79 | |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 80 | if (skb_vlan_tag_present(skb) && |
Eric W. Biederman | 944e294 | 2014-03-27 15:37:28 -0700 | [diff] [blame] | 81 | !vlan_hw_offload_capable(features, skb->vlan_proto)) { |
Jiri Pirko | 5968250 | 2014-11-19 14:04:59 +0100 | [diff] [blame] | 82 | skb = __vlan_hwaccel_push_inside(skb); |
Eric W. Biederman | 944e294 | 2014-03-27 15:37:28 -0700 | [diff] [blame] | 83 | if (unlikely(!skb)) { |
| 84 | /* This is actually a packet drop, but we |
| 85 | * don't want the code that calls this |
| 86 | * function to try and operate on a NULL skb. |
| 87 | */ |
| 88 | goto out; |
| 89 | } |
Eric W. Biederman | 944e294 | 2014-03-27 15:37:28 -0700 | [diff] [blame] | 90 | } |
| 91 | |
David S. Miller | fa2dbdc | 2014-08-29 21:55:22 -0700 | [diff] [blame] | 92 | status = netdev_start_xmit(skb, dev, txq, false); |
Eric W. Biederman | 944e294 | 2014-03-27 15:37:28 -0700 | [diff] [blame] | 93 | |
| 94 | out: |
| 95 | return status; |
| 96 | } |
| 97 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 98 | static void queue_process(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | { |
David Howells | 4c1ac1b | 2006-12-05 14:37:56 +0000 | [diff] [blame] | 100 | struct netpoll_info *npinfo = |
| 101 | container_of(work, struct netpoll_info, tx_work.work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | struct sk_buff *skb; |
Ingo Molnar | 3640543 | 2006-12-12 17:20:42 +0100 | [diff] [blame] | 103 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 105 | while ((skb = skb_dequeue(&npinfo->txq))) { |
| 106 | struct net_device *dev = skb->dev; |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 107 | struct netdev_queue *txq; |
Tushar Dave | c70b17b7 | 2017-04-20 15:57:31 -0700 | [diff] [blame] | 108 | unsigned int q_index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 110 | if (!netif_device_present(dev) || !netif_running(dev)) { |
Eric W. Biederman | 080b3c1 | 2014-03-27 15:41:04 -0700 | [diff] [blame] | 111 | kfree_skb(skb); |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 112 | continue; |
| 113 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
Ingo Molnar | 3640543 | 2006-12-12 17:20:42 +0100 | [diff] [blame] | 115 | local_irq_save(flags); |
Tushar Dave | c70b17b7 | 2017-04-20 15:57:31 -0700 | [diff] [blame] | 116 | /* check if skb->queue_mapping is still valid */ |
| 117 | q_index = skb_get_queue_mapping(skb); |
| 118 | if (unlikely(q_index >= dev->real_num_tx_queues)) { |
| 119 | q_index = q_index % dev->real_num_tx_queues; |
| 120 | skb_set_queue_mapping(skb, q_index); |
| 121 | } |
| 122 | txq = netdev_get_tx_queue(dev, q_index); |
Eric W. Biederman | 5efeac4 | 2014-03-27 15:42:20 -0700 | [diff] [blame] | 123 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
Tom Herbert | 73466498 | 2011-11-28 16:32:44 +0000 | [diff] [blame] | 124 | if (netif_xmit_frozen_or_stopped(txq) || |
Eric W. Biederman | 944e294 | 2014-03-27 15:37:28 -0700 | [diff] [blame] | 125 | netpoll_start_xmit(skb, dev, txq) != NETDEV_TX_OK) { |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 126 | skb_queue_head(&npinfo->txq, skb); |
Eric W. Biederman | 5efeac4 | 2014-03-27 15:42:20 -0700 | [diff] [blame] | 127 | HARD_TX_UNLOCK(dev, txq); |
Ingo Molnar | 3640543 | 2006-12-12 17:20:42 +0100 | [diff] [blame] | 128 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
Jarek Poplawski | 25442ca | 2007-07-05 17:42:44 -0700 | [diff] [blame] | 130 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 131 | return; |
| 132 | } |
Eric W. Biederman | 5efeac4 | 2014-03-27 15:42:20 -0700 | [diff] [blame] | 133 | HARD_TX_UNLOCK(dev, txq); |
Ingo Molnar | 3640543 | 2006-12-12 17:20:42 +0100 | [diff] [blame] | 134 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | } |
| 136 | } |
| 137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | /* |
| 139 | * Check whether delayed processing was scheduled for our NIC. If so, |
| 140 | * we attempt to grab the poll lock and use ->poll() to pump the card. |
| 141 | * If this fails, either we've recursed in ->poll() or it's already |
| 142 | * running on another CPU. |
| 143 | * |
| 144 | * Note: we don't mask interrupts with this lock because we're using |
| 145 | * trylock here and interrupts are already disabled in the softirq |
| 146 | * case. Further, we test the poll_owner to avoid recursion on UP |
| 147 | * systems where the lock doesn't exist. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | */ |
Alexander Duyck | 822d54b | 2015-09-28 09:16:17 -0700 | [diff] [blame] | 149 | static void poll_one_napi(struct napi_struct *napi) |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 150 | { |
Neil Horman | 2d8bff126 | 2015-09-23 14:57:58 -0400 | [diff] [blame] | 151 | int work = 0; |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 152 | |
| 153 | /* net_rx_action's ->poll() invocations and our's are |
| 154 | * synchronized by this test which is only made while |
| 155 | * holding the napi->poll_lock. |
| 156 | */ |
| 157 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) |
Alexander Duyck | 822d54b | 2015-09-28 09:16:17 -0700 | [diff] [blame] | 158 | return; |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 159 | |
Neil Horman | 2d8bff126 | 2015-09-23 14:57:58 -0400 | [diff] [blame] | 160 | /* If we set this bit but see that it has already been set, |
| 161 | * that indicates that napi has been disabled and we need |
| 162 | * to abort this operation |
| 163 | */ |
| 164 | if (test_and_set_bit(NAPI_STATE_NPSVC, &napi->state)) |
Alexander Duyck | 822d54b | 2015-09-28 09:16:17 -0700 | [diff] [blame] | 165 | return; |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 166 | |
Alexander Duyck | 822d54b | 2015-09-28 09:16:17 -0700 | [diff] [blame] | 167 | /* We explicilty pass the polling call a budget of 0 to |
| 168 | * indicate that we are clearing the Tx path only. |
| 169 | */ |
| 170 | work = napi->poll(napi, 0); |
| 171 | WARN_ONCE(work, "%pF exceeded budget in poll\n", napi->poll); |
Jesper Dangaard Brouer | 1db19db | 2016-07-07 18:01:32 +0200 | [diff] [blame] | 172 | trace_napi_poll(napi, work, 0); |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 173 | |
Neil Horman | 7b363e4 | 2008-12-09 23:22:26 -0800 | [diff] [blame] | 174 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
David S. Miller | 0a7606c | 2007-10-29 21:28:47 -0700 | [diff] [blame] | 175 | } |
| 176 | |
Alexander Duyck | 822d54b | 2015-09-28 09:16:17 -0700 | [diff] [blame] | 177 | static void poll_napi(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | { |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 179 | struct napi_struct *napi; |
Eric Dumazet | 89c4b44 | 2016-11-16 14:54:50 -0800 | [diff] [blame] | 180 | int cpu = smp_processor_id(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
Neil Horman | f13d493 | 2010-10-19 07:04:26 +0000 | [diff] [blame] | 182 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
Eric Dumazet | 89c4b44 | 2016-11-16 14:54:50 -0800 | [diff] [blame] | 183 | if (cmpxchg(&napi->poll_owner, -1, cpu) == -1) { |
Alexander Duyck | 822d54b | 2015-09-28 09:16:17 -0700 | [diff] [blame] | 184 | poll_one_napi(napi); |
Eric Dumazet | 89c4b44 | 2016-11-16 14:54:50 -0800 | [diff] [blame] | 185 | smp_store_release(&napi->poll_owner, -1); |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 186 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
| 188 | } |
| 189 | |
Joe Perches | 234b921 | 2011-06-30 15:08:57 +0000 | [diff] [blame] | 190 | static void netpoll_poll_dev(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | { |
Pavel Emelyanov | 5e39273 | 2009-05-11 00:36:35 +0000 | [diff] [blame] | 192 | const struct net_device_ops *ops; |
Amerigo Wang | 2899656 | 2012-08-10 01:24:42 +0000 | [diff] [blame] | 193 | struct netpoll_info *ni = rcu_dereference_bh(dev->npinfo); |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 194 | |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 195 | /* Don't do any rx activity if the dev_lock mutex is held |
| 196 | * the dev_open/close paths use this to block netpoll activity |
| 197 | * while changing device state |
| 198 | */ |
Dan Carpenter | a3dbbc2 | 2013-05-06 02:15:13 +0000 | [diff] [blame] | 199 | if (down_trylock(&ni->dev_lock)) |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 200 | return; |
| 201 | |
Neil Horman | 959d5fd | 2013-02-13 11:32:42 -0500 | [diff] [blame] | 202 | if (!netif_running(dev)) { |
Neil Horman | bd7c4b6 | 2013-04-30 05:35:05 +0000 | [diff] [blame] | 203 | up(&ni->dev_lock); |
Pavel Emelyanov | 5e39273 | 2009-05-11 00:36:35 +0000 | [diff] [blame] | 204 | return; |
Neil Horman | 959d5fd | 2013-02-13 11:32:42 -0500 | [diff] [blame] | 205 | } |
Pavel Emelyanov | 5e39273 | 2009-05-11 00:36:35 +0000 | [diff] [blame] | 206 | |
| 207 | ops = dev->netdev_ops; |
Neil Horman | 959d5fd | 2013-02-13 11:32:42 -0500 | [diff] [blame] | 208 | if (!ops->ndo_poll_controller) { |
Neil Horman | bd7c4b6 | 2013-04-30 05:35:05 +0000 | [diff] [blame] | 209 | up(&ni->dev_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | return; |
Neil Horman | 959d5fd | 2013-02-13 11:32:42 -0500 | [diff] [blame] | 211 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
| 213 | /* Process pending work on NIC */ |
Stephen Hemminger | d314774 | 2008-11-19 21:32:24 -0800 | [diff] [blame] | 214 | ops->ndo_poll_controller(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
Alexander Duyck | 822d54b | 2015-09-28 09:16:17 -0700 | [diff] [blame] | 216 | poll_napi(dev); |
Stephen Hemminger | 5106930 | 2007-11-19 19:18:11 -0800 | [diff] [blame] | 217 | |
Neil Horman | bd7c4b6 | 2013-04-30 05:35:05 +0000 | [diff] [blame] | 218 | up(&ni->dev_lock); |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 219 | |
David S. Miller | 3578b0c | 2010-08-03 00:24:04 -0700 | [diff] [blame] | 220 | zap_completion_queue(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | } |
| 222 | |
Eric W. Biederman | 66b5552 | 2014-03-27 15:39:03 -0700 | [diff] [blame] | 223 | void netpoll_poll_disable(struct net_device *dev) |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 224 | { |
| 225 | struct netpoll_info *ni; |
| 226 | int idx; |
| 227 | might_sleep(); |
| 228 | idx = srcu_read_lock(&netpoll_srcu); |
| 229 | ni = srcu_dereference(dev->npinfo, &netpoll_srcu); |
| 230 | if (ni) |
Neil Horman | bd7c4b6 | 2013-04-30 05:35:05 +0000 | [diff] [blame] | 231 | down(&ni->dev_lock); |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 232 | srcu_read_unlock(&netpoll_srcu, idx); |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 233 | } |
Eric W. Biederman | 66b5552 | 2014-03-27 15:39:03 -0700 | [diff] [blame] | 234 | EXPORT_SYMBOL(netpoll_poll_disable); |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 235 | |
Eric W. Biederman | 66b5552 | 2014-03-27 15:39:03 -0700 | [diff] [blame] | 236 | void netpoll_poll_enable(struct net_device *dev) |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 237 | { |
| 238 | struct netpoll_info *ni; |
| 239 | rcu_read_lock(); |
| 240 | ni = rcu_dereference(dev->npinfo); |
| 241 | if (ni) |
Neil Horman | bd7c4b6 | 2013-04-30 05:35:05 +0000 | [diff] [blame] | 242 | up(&ni->dev_lock); |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 243 | rcu_read_unlock(); |
| 244 | } |
Eric W. Biederman | 66b5552 | 2014-03-27 15:39:03 -0700 | [diff] [blame] | 245 | EXPORT_SYMBOL(netpoll_poll_enable); |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | static void refill_skbs(void) |
| 248 | { |
| 249 | struct sk_buff *skb; |
| 250 | unsigned long flags; |
| 251 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 252 | spin_lock_irqsave(&skb_pool.lock, flags); |
| 253 | while (skb_pool.qlen < MAX_SKBS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
| 255 | if (!skb) |
| 256 | break; |
| 257 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 258 | __skb_queue_tail(&skb_pool, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | } |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 260 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | } |
| 262 | |
David S. Miller | 3578b0c | 2010-08-03 00:24:04 -0700 | [diff] [blame] | 263 | static void zap_completion_queue(void) |
| 264 | { |
| 265 | unsigned long flags; |
| 266 | struct softnet_data *sd = &get_cpu_var(softnet_data); |
| 267 | |
| 268 | if (sd->completion_queue) { |
| 269 | struct sk_buff *clist; |
| 270 | |
| 271 | local_irq_save(flags); |
| 272 | clist = sd->completion_queue; |
| 273 | sd->completion_queue = NULL; |
| 274 | local_irq_restore(flags); |
| 275 | |
| 276 | while (clist != NULL) { |
| 277 | struct sk_buff *skb = clist; |
| 278 | clist = clist->next; |
Eric W. Biederman | b1586f0 | 2014-04-01 12:21:02 -0700 | [diff] [blame] | 279 | if (!skb_irq_freeable(skb)) { |
David S. Miller | 3578b0c | 2010-08-03 00:24:04 -0700 | [diff] [blame] | 280 | atomic_inc(&skb->users); |
| 281 | dev_kfree_skb_any(skb); /* put this one back */ |
| 282 | } else { |
| 283 | __kfree_skb(skb); |
| 284 | } |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | put_cpu_var(softnet_data); |
| 289 | } |
| 290 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 291 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | { |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 293 | int count = 0; |
| 294 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
David S. Miller | 3578b0c | 2010-08-03 00:24:04 -0700 | [diff] [blame] | 296 | zap_completion_queue(); |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 297 | refill_skbs(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | repeat: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
| 300 | skb = alloc_skb(len, GFP_ATOMIC); |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 301 | if (!skb) |
| 302 | skb = skb_dequeue(&skb_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | |
| 304 | if (!skb) { |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 305 | if (++count < 10) { |
Joe Perches | 2a49e00 | 2011-06-30 15:08:58 +0000 | [diff] [blame] | 306 | netpoll_poll_dev(np->dev); |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 307 | goto repeat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | } |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 309 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | } |
| 311 | |
| 312 | atomic_set(&skb->users, 1); |
| 313 | skb_reserve(skb, reserve); |
| 314 | return skb; |
| 315 | } |
| 316 | |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 317 | static int netpoll_owner_active(struct net_device *dev) |
| 318 | { |
| 319 | struct napi_struct *napi; |
| 320 | |
| 321 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
| 322 | if (napi->poll_owner == smp_processor_id()) |
| 323 | return 1; |
| 324 | } |
| 325 | return 0; |
| 326 | } |
| 327 | |
Amerigo Wang | 2899656 | 2012-08-10 01:24:42 +0000 | [diff] [blame] | 328 | /* call with IRQ disabled */ |
Neil Horman | c2355e1 | 2010-10-13 16:01:49 +0000 | [diff] [blame] | 329 | void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb, |
| 330 | struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | { |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 332 | int status = NETDEV_TX_BUSY; |
| 333 | unsigned long tries; |
Herbert Xu | de85d99 | 2010-06-10 16:12:44 +0000 | [diff] [blame] | 334 | /* It is up to the caller to keep npinfo alive. */ |
Amerigo Wang | 2899656 | 2012-08-10 01:24:42 +0000 | [diff] [blame] | 335 | struct netpoll_info *npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | |
Amerigo Wang | 2899656 | 2012-08-10 01:24:42 +0000 | [diff] [blame] | 337 | WARN_ON_ONCE(!irqs_disabled()); |
| 338 | |
| 339 | npinfo = rcu_dereference_bh(np->dev->npinfo); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 340 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
Eric W. Biederman | 080b3c1 | 2014-03-27 15:41:04 -0700 | [diff] [blame] | 341 | dev_kfree_skb_irq(skb); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 342 | return; |
| 343 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 345 | /* don't get messages out of order, and no recursion */ |
Stephen Hemminger | bea3348 | 2007-10-03 16:41:36 -0700 | [diff] [blame] | 346 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 347 | struct netdev_queue *txq; |
Andrew Morton | a49f99f | 2006-12-11 17:24:46 -0800 | [diff] [blame] | 348 | |
Jason Wang | f663dd9 | 2014-01-10 16:18:26 +0800 | [diff] [blame] | 349 | txq = netdev_pick_tx(dev, skb, NULL); |
David S. Miller | fd2ea0a | 2008-07-17 01:56:23 -0700 | [diff] [blame] | 350 | |
Stephen Hemminger | 0db3dc7 | 2007-06-27 00:39:42 -0700 | [diff] [blame] | 351 | /* try until next clock tick */ |
| 352 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; |
| 353 | tries > 0; --tries) { |
Eric W. Biederman | 5efeac4 | 2014-03-27 15:42:20 -0700 | [diff] [blame] | 354 | if (HARD_TX_TRYLOCK(dev, txq)) { |
Eric W. Biederman | 944e294 | 2014-03-27 15:37:28 -0700 | [diff] [blame] | 355 | if (!netif_xmit_stopped(txq)) |
| 356 | status = netpoll_start_xmit(skb, dev, txq); |
Amerigo Wang | 689971b | 2012-08-10 01:24:49 +0000 | [diff] [blame] | 357 | |
Eric W. Biederman | 5efeac4 | 2014-03-27 15:42:20 -0700 | [diff] [blame] | 358 | HARD_TX_UNLOCK(dev, txq); |
Matt Mackall | f0d3459 | 2005-08-11 19:25:11 -0700 | [diff] [blame] | 359 | |
Andrew Morton | e37b8d9 | 2006-12-09 14:01:49 -0800 | [diff] [blame] | 360 | if (status == NETDEV_TX_OK) |
| 361 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
Andrew Morton | e37b8d9 | 2006-12-09 14:01:49 -0800 | [diff] [blame] | 363 | } |
Stephen Hemminger | 0db3dc7 | 2007-06-27 00:39:42 -0700 | [diff] [blame] | 364 | |
| 365 | /* tickle device maybe there is some cleanup */ |
Joe Perches | 2a49e00 | 2011-06-30 15:08:58 +0000 | [diff] [blame] | 366 | netpoll_poll_dev(np->dev); |
Stephen Hemminger | 0db3dc7 | 2007-06-27 00:39:42 -0700 | [diff] [blame] | 367 | |
| 368 | udelay(USEC_PER_POLL); |
Matt Mackall | 0db1d6f | 2005-08-11 19:25:54 -0700 | [diff] [blame] | 369 | } |
Dongdong Deng | 79b1bee | 2009-08-21 03:33:36 +0000 | [diff] [blame] | 370 | |
| 371 | WARN_ONCE(!irqs_disabled(), |
Amerigo Wang | 2899656 | 2012-08-10 01:24:42 +0000 | [diff] [blame] | 372 | "netpoll_send_skb_on_dev(): %s enabled interrupts in poll (%pF)\n", |
Eric W. Biederman | 944e294 | 2014-03-27 15:37:28 -0700 | [diff] [blame] | 373 | dev->name, dev->netdev_ops->ndo_start_xmit); |
Dongdong Deng | 79b1bee | 2009-08-21 03:33:36 +0000 | [diff] [blame] | 374 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 377 | if (status != NETDEV_TX_OK) { |
Stephen Hemminger | 5de4a47 | 2006-10-26 15:46:55 -0700 | [diff] [blame] | 378 | skb_queue_tail(&npinfo->txq, skb); |
David Howells | 4c1ac1b | 2006-12-05 14:37:56 +0000 | [diff] [blame] | 379 | schedule_delayed_work(&npinfo->tx_work,0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | } |
Neil Horman | c2355e1 | 2010-10-13 16:01:49 +0000 | [diff] [blame] | 382 | EXPORT_SYMBOL(netpoll_send_skb_on_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
| 384 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) |
| 385 | { |
Eric Dumazet | 954fba0 | 2012-06-12 19:30:21 +0000 | [diff] [blame] | 386 | int total_len, ip_len, udp_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | struct sk_buff *skb; |
| 388 | struct udphdr *udph; |
| 389 | struct iphdr *iph; |
| 390 | struct ethhdr *eth; |
Eric Dumazet | ee13040 | 2012-08-24 01:47:26 +0000 | [diff] [blame] | 391 | static atomic_t ip_ident; |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 392 | struct ipv6hdr *ip6h; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
Nikolay Aleksandrov | c9fd56b | 2015-08-28 15:44:25 -0700 | [diff] [blame] | 394 | WARN_ON_ONCE(!irqs_disabled()); |
| 395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | udp_len = len + sizeof(*udph); |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 397 | if (np->ipv6) |
| 398 | ip_len = udp_len + sizeof(*ip6h); |
| 399 | else |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 400 | ip_len = udp_len + sizeof(*iph); |
| 401 | |
Eric Dumazet | 954fba0 | 2012-06-12 19:30:21 +0000 | [diff] [blame] | 402 | total_len = ip_len + LL_RESERVED_SPACE(np->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
Eric Dumazet | 954fba0 | 2012-06-12 19:30:21 +0000 | [diff] [blame] | 404 | skb = find_skb(np, total_len + np->dev->needed_tailroom, |
| 405 | total_len - len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | if (!skb) |
| 407 | return; |
| 408 | |
Arnaldo Carvalho de Melo | 27d7ff4 | 2007-03-31 11:55:19 -0300 | [diff] [blame] | 409 | skb_copy_to_linear_data(skb, msg, len); |
Eric Dumazet | 954fba0 | 2012-06-12 19:30:21 +0000 | [diff] [blame] | 410 | skb_put(skb, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Arnaldo Carvalho de Melo | 4bedb45 | 2007-03-13 14:28:48 -0300 | [diff] [blame] | 412 | skb_push(skb, sizeof(*udph)); |
| 413 | skb_reset_transport_header(skb); |
| 414 | udph = udp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | udph->source = htons(np->local_port); |
| 416 | udph->dest = htons(np->remote_port); |
| 417 | udph->len = htons(udp_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 419 | if (np->ipv6) { |
| 420 | udph->check = 0; |
| 421 | udph->check = csum_ipv6_magic(&np->local_ip.in6, |
| 422 | &np->remote_ip.in6, |
| 423 | udp_len, IPPROTO_UDP, |
| 424 | csum_partial(udph, udp_len, 0)); |
| 425 | if (udph->check == 0) |
| 426 | udph->check = CSUM_MANGLED_0; |
| 427 | |
| 428 | skb_push(skb, sizeof(*ip6h)); |
| 429 | skb_reset_network_header(skb); |
| 430 | ip6h = ipv6_hdr(skb); |
| 431 | |
| 432 | /* ip6h->version = 6; ip6h->priority = 0; */ |
| 433 | put_unaligned(0x60, (unsigned char *)ip6h); |
| 434 | ip6h->flow_lbl[0] = 0; |
| 435 | ip6h->flow_lbl[1] = 0; |
| 436 | ip6h->flow_lbl[2] = 0; |
| 437 | |
| 438 | ip6h->payload_len = htons(sizeof(struct udphdr) + len); |
| 439 | ip6h->nexthdr = IPPROTO_UDP; |
| 440 | ip6h->hop_limit = 32; |
| 441 | ip6h->saddr = np->local_ip.in6; |
| 442 | ip6h->daddr = np->remote_ip.in6; |
| 443 | |
| 444 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); |
| 445 | skb_reset_mac_header(skb); |
| 446 | skb->protocol = eth->h_proto = htons(ETH_P_IPV6); |
| 447 | } else { |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 448 | udph->check = 0; |
| 449 | udph->check = csum_tcpudp_magic(np->local_ip.ip, |
| 450 | np->remote_ip.ip, |
| 451 | udp_len, IPPROTO_UDP, |
| 452 | csum_partial(udph, udp_len, 0)); |
| 453 | if (udph->check == 0) |
| 454 | udph->check = CSUM_MANGLED_0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 456 | skb_push(skb, sizeof(*iph)); |
| 457 | skb_reset_network_header(skb); |
| 458 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 460 | /* iph->version = 4; iph->ihl = 5; */ |
| 461 | put_unaligned(0x45, (unsigned char *)iph); |
| 462 | iph->tos = 0; |
| 463 | put_unaligned(htons(ip_len), &(iph->tot_len)); |
| 464 | iph->id = htons(atomic_inc_return(&ip_ident)); |
| 465 | iph->frag_off = 0; |
| 466 | iph->ttl = 64; |
| 467 | iph->protocol = IPPROTO_UDP; |
| 468 | iph->check = 0; |
| 469 | put_unaligned(np->local_ip.ip, &(iph->saddr)); |
| 470 | put_unaligned(np->remote_ip.ip, &(iph->daddr)); |
| 471 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
| 472 | |
| 473 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); |
| 474 | skb_reset_mac_header(skb); |
| 475 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
| 476 | } |
| 477 | |
Joe Perches | c62326a | 2014-01-20 09:52:18 -0800 | [diff] [blame] | 478 | ether_addr_copy(eth->h_source, np->dev->dev_addr); |
| 479 | ether_addr_copy(eth->h_dest, np->remote_mac); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | |
| 481 | skb->dev = np->dev; |
| 482 | |
| 483 | netpoll_send_skb(np, skb); |
| 484 | } |
Eric Dumazet | 9e34a5b | 2010-07-09 21:22:04 +0000 | [diff] [blame] | 485 | EXPORT_SYMBOL(netpoll_send_udp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 487 | void netpoll_print_options(struct netpoll *np) |
| 488 | { |
Joe Perches | e6ec26935 | 2012-01-29 15:50:43 +0000 | [diff] [blame] | 489 | np_info(np, "local port %d\n", np->local_port); |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 490 | if (np->ipv6) |
| 491 | np_info(np, "local IPv6 address %pI6c\n", &np->local_ip.in6); |
| 492 | else |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 493 | np_info(np, "local IPv4 address %pI4\n", &np->local_ip.ip); |
Joe Perches | e6ec26935 | 2012-01-29 15:50:43 +0000 | [diff] [blame] | 494 | np_info(np, "interface '%s'\n", np->dev_name); |
| 495 | np_info(np, "remote port %d\n", np->remote_port); |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 496 | if (np->ipv6) |
| 497 | np_info(np, "remote IPv6 address %pI6c\n", &np->remote_ip.in6); |
| 498 | else |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 499 | np_info(np, "remote IPv4 address %pI4\n", &np->remote_ip.ip); |
Joe Perches | e6ec26935 | 2012-01-29 15:50:43 +0000 | [diff] [blame] | 500 | np_info(np, "remote ethernet address %pM\n", np->remote_mac); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 501 | } |
Eric Dumazet | 9e34a5b | 2010-07-09 21:22:04 +0000 | [diff] [blame] | 502 | EXPORT_SYMBOL(netpoll_print_options); |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 503 | |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 504 | static int netpoll_parse_ip_addr(const char *str, union inet_addr *addr) |
| 505 | { |
| 506 | const char *end; |
| 507 | |
| 508 | if (!strchr(str, ':') && |
| 509 | in4_pton(str, -1, (void *)addr, -1, &end) > 0) { |
| 510 | if (!*end) |
| 511 | return 0; |
| 512 | } |
| 513 | if (in6_pton(str, -1, addr->in6.s6_addr, -1, &end) > 0) { |
| 514 | #if IS_ENABLED(CONFIG_IPV6) |
| 515 | if (!*end) |
| 516 | return 1; |
| 517 | #else |
| 518 | return -1; |
| 519 | #endif |
| 520 | } |
| 521 | return -1; |
| 522 | } |
| 523 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | int netpoll_parse_options(struct netpoll *np, char *opt) |
| 525 | { |
| 526 | char *cur=opt, *delim; |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 527 | int ipv6; |
Sabrina Dubroca | 00fe11b | 2014-02-06 18:34:12 +0100 | [diff] [blame] | 528 | bool ipversion_set = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 530 | if (*cur != '@') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | if ((delim = strchr(cur, '@')) == NULL) |
| 532 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 533 | *delim = 0; |
Abhijit Pawar | 4b5511e | 2012-12-09 23:12:28 +0000 | [diff] [blame] | 534 | if (kstrtou16(cur, 10, &np->local_port)) |
| 535 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 536 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | } |
| 538 | cur++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 540 | if (*cur != '/') { |
Sabrina Dubroca | 00fe11b | 2014-02-06 18:34:12 +0100 | [diff] [blame] | 541 | ipversion_set = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | if ((delim = strchr(cur, '/')) == NULL) |
| 543 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 544 | *delim = 0; |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 545 | ipv6 = netpoll_parse_ip_addr(cur, &np->local_ip); |
| 546 | if (ipv6 < 0) |
| 547 | goto parse_failed; |
| 548 | else |
| 549 | np->ipv6 = (bool)ipv6; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 550 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | } |
| 552 | cur++; |
| 553 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 554 | if (*cur != ',') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | /* parse out dev name */ |
| 556 | if ((delim = strchr(cur, ',')) == NULL) |
| 557 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 558 | *delim = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 560 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | } |
| 562 | cur++; |
| 563 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 564 | if (*cur != '@') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | /* dst port */ |
| 566 | if ((delim = strchr(cur, '@')) == NULL) |
| 567 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 568 | *delim = 0; |
Amerigo Wang | 5fc05f8 | 2010-03-21 22:59:58 +0000 | [diff] [blame] | 569 | if (*cur == ' ' || *cur == '\t') |
Joe Perches | e6ec26935 | 2012-01-29 15:50:43 +0000 | [diff] [blame] | 570 | np_info(np, "warning: whitespace is not allowed\n"); |
Abhijit Pawar | 4b5511e | 2012-12-09 23:12:28 +0000 | [diff] [blame] | 571 | if (kstrtou16(cur, 10, &np->remote_port)) |
| 572 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 573 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | } |
| 575 | cur++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | |
| 577 | /* dst ip */ |
| 578 | if ((delim = strchr(cur, '/')) == NULL) |
| 579 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 580 | *delim = 0; |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 581 | ipv6 = netpoll_parse_ip_addr(cur, &np->remote_ip); |
| 582 | if (ipv6 < 0) |
| 583 | goto parse_failed; |
Sabrina Dubroca | 00fe11b | 2014-02-06 18:34:12 +0100 | [diff] [blame] | 584 | else if (ipversion_set && np->ipv6 != (bool)ipv6) |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 585 | goto parse_failed; |
| 586 | else |
| 587 | np->ipv6 = (bool)ipv6; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 588 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 590 | if (*cur != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | /* MAC address */ |
Alexey Dobriyan | 4940fc8 | 2011-05-07 23:00:07 +0000 | [diff] [blame] | 592 | if (!mac_pton(cur, np->remote_mac)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | goto parse_failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | } |
| 595 | |
Satyam Sharma | 0bcc181 | 2007-08-10 15:35:05 -0700 | [diff] [blame] | 596 | netpoll_print_options(np); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | |
| 598 | return 0; |
| 599 | |
| 600 | parse_failed: |
Joe Perches | e6ec26935 | 2012-01-29 15:50:43 +0000 | [diff] [blame] | 601 | np_info(np, "couldn't parse config at '%s'!\n", cur); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | return -1; |
| 603 | } |
Eric Dumazet | 9e34a5b | 2010-07-09 21:22:04 +0000 | [diff] [blame] | 604 | EXPORT_SYMBOL(netpoll_parse_options); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | |
Eric W. Biederman | a8779ec | 2014-03-27 15:36:38 -0700 | [diff] [blame] | 606 | int __netpoll_setup(struct netpoll *np, struct net_device *ndev) |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 607 | { |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 608 | struct netpoll_info *npinfo; |
| 609 | const struct net_device_ops *ops; |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 610 | int err; |
| 611 | |
Bjorn Helgaas | 727ceaa | 2016-04-05 15:58:22 -0500 | [diff] [blame] | 612 | np->dev = ndev; |
Jiri Pirko | 30fdd8a0 | 2012-07-17 05:22:35 +0000 | [diff] [blame] | 613 | strlcpy(np->dev_name, ndev->name, IFNAMSIZ); |
Neil Horman | 2cde6ac | 2013-02-11 10:25:30 +0000 | [diff] [blame] | 614 | INIT_WORK(&np->cleanup_work, netpoll_async_cleanup); |
Jiri Pirko | 30fdd8a0 | 2012-07-17 05:22:35 +0000 | [diff] [blame] | 615 | |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 616 | if ((ndev->priv_flags & IFF_DISABLE_NETPOLL) || |
| 617 | !ndev->netdev_ops->ndo_poll_controller) { |
Joe Perches | e6ec26935 | 2012-01-29 15:50:43 +0000 | [diff] [blame] | 618 | np_err(np, "%s doesn't support polling, aborting\n", |
| 619 | np->dev_name); |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 620 | err = -ENOTSUPP; |
| 621 | goto out; |
| 622 | } |
| 623 | |
| 624 | if (!ndev->npinfo) { |
Eric W. Biederman | a8779ec | 2014-03-27 15:36:38 -0700 | [diff] [blame] | 625 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 626 | if (!npinfo) { |
| 627 | err = -ENOMEM; |
| 628 | goto out; |
| 629 | } |
| 630 | |
Neil Horman | bd7c4b6 | 2013-04-30 05:35:05 +0000 | [diff] [blame] | 631 | sema_init(&npinfo->dev_lock, 1); |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 632 | skb_queue_head_init(&npinfo->txq); |
| 633 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
| 634 | |
| 635 | atomic_set(&npinfo->refcnt, 1); |
| 636 | |
| 637 | ops = np->dev->netdev_ops; |
| 638 | if (ops->ndo_netpoll_setup) { |
Eric W. Biederman | a8779ec | 2014-03-27 15:36:38 -0700 | [diff] [blame] | 639 | err = ops->ndo_netpoll_setup(ndev, npinfo); |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 640 | if (err) |
| 641 | goto free_npinfo; |
| 642 | } |
| 643 | } else { |
Neil Horman | 0790bbb | 2013-02-11 10:25:31 +0000 | [diff] [blame] | 644 | npinfo = rtnl_dereference(ndev->npinfo); |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 645 | atomic_inc(&npinfo->refcnt); |
| 646 | } |
| 647 | |
| 648 | npinfo->netpoll = np; |
| 649 | |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 650 | /* last thing to do is link it to the net device structure */ |
Eric Dumazet | cf778b0 | 2012-01-12 04:41:32 +0000 | [diff] [blame] | 651 | rcu_assign_pointer(ndev->npinfo, npinfo); |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 652 | |
| 653 | return 0; |
| 654 | |
| 655 | free_npinfo: |
| 656 | kfree(npinfo); |
| 657 | out: |
| 658 | return err; |
| 659 | } |
| 660 | EXPORT_SYMBOL_GPL(__netpoll_setup); |
| 661 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | int netpoll_setup(struct netpoll *np) |
| 663 | { |
| 664 | struct net_device *ndev = NULL; |
| 665 | struct in_device *in_dev; |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 666 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | |
Cong Wang | f92d318 | 2013-01-14 23:34:06 +0000 | [diff] [blame] | 668 | rtnl_lock(); |
Cong Wang | 556e625 | 2013-01-27 15:55:21 +0000 | [diff] [blame] | 669 | if (np->dev_name) { |
| 670 | struct net *net = current->nsproxy->net_ns; |
| 671 | ndev = __dev_get_by_name(net, np->dev_name); |
| 672 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | if (!ndev) { |
Joe Perches | e6ec26935 | 2012-01-29 15:50:43 +0000 | [diff] [blame] | 674 | np_err(np, "%s doesn't exist, aborting\n", np->dev_name); |
Cong Wang | f92d318 | 2013-01-14 23:34:06 +0000 | [diff] [blame] | 675 | err = -ENODEV; |
| 676 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | } |
Cong Wang | 5bd30d3 | 2013-01-17 12:21:08 +0800 | [diff] [blame] | 678 | dev_hold(ndev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
Jiri Pirko | 49bd8fb | 2013-01-03 22:48:55 +0000 | [diff] [blame] | 680 | if (netdev_master_upper_dev_get(ndev)) { |
Joe Perches | e6ec26935 | 2012-01-29 15:50:43 +0000 | [diff] [blame] | 681 | np_err(np, "%s is a slave device, aborting\n", np->dev_name); |
Dan Carpenter | 83fe32d | 2011-06-11 18:55:22 -0700 | [diff] [blame] | 682 | err = -EBUSY; |
| 683 | goto put; |
WANG Cong | 0c1ad04 | 2011-06-09 00:28:13 -0700 | [diff] [blame] | 684 | } |
| 685 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | if (!netif_running(ndev)) { |
| 687 | unsigned long atmost, atleast; |
| 688 | |
Joe Perches | e6ec26935 | 2012-01-29 15:50:43 +0000 | [diff] [blame] | 689 | np_info(np, "device %s not up yet, forcing it\n", np->dev_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 691 | err = dev_open(ndev); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 692 | |
| 693 | if (err) { |
Joe Perches | e6ec26935 | 2012-01-29 15:50:43 +0000 | [diff] [blame] | 694 | np_err(np, "failed to open %s\n", ndev->name); |
Herbert Xu | dbaa154 | 2010-06-10 16:12:46 +0000 | [diff] [blame] | 695 | goto put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | |
Cong Wang | f92d318 | 2013-01-14 23:34:06 +0000 | [diff] [blame] | 698 | rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | atleast = jiffies + HZ/10; |
Anton Vorontsov | bff3877 | 2009-07-08 11:10:56 -0700 | [diff] [blame] | 700 | atmost = jiffies + carrier_timeout * HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | while (!netif_carrier_ok(ndev)) { |
| 702 | if (time_after(jiffies, atmost)) { |
Joe Perches | e6ec26935 | 2012-01-29 15:50:43 +0000 | [diff] [blame] | 703 | np_notice(np, "timeout waiting for carrier\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | break; |
| 705 | } |
Anton Vorontsov | 1b614fb | 2009-07-08 20:09:44 -0700 | [diff] [blame] | 706 | msleep(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | } |
| 708 | |
| 709 | /* If carrier appears to come up instantly, we don't |
| 710 | * trust it and pause so that we don't pump all our |
| 711 | * queued console messages into the bitbucket. |
| 712 | */ |
| 713 | |
| 714 | if (time_before(jiffies, atleast)) { |
Joe Perches | e6ec26935 | 2012-01-29 15:50:43 +0000 | [diff] [blame] | 715 | np_notice(np, "carrier detect appears untrustworthy, waiting 4 seconds\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | msleep(4000); |
| 717 | } |
Cong Wang | f92d318 | 2013-01-14 23:34:06 +0000 | [diff] [blame] | 718 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | } |
| 720 | |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 721 | if (!np->local_ip.ip) { |
| 722 | if (!np->ipv6) { |
Cong Wang | f92d318 | 2013-01-14 23:34:06 +0000 | [diff] [blame] | 723 | in_dev = __in_dev_get_rtnl(ndev); |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 724 | |
| 725 | if (!in_dev || !in_dev->ifa_list) { |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 726 | np_err(np, "no IP address for %s, aborting\n", |
| 727 | np->dev_name); |
| 728 | err = -EDESTADDRREQ; |
| 729 | goto put; |
| 730 | } |
| 731 | |
| 732 | np->local_ip.ip = in_dev->ifa_list->ifa_local; |
Cong Wang | b7394d2 | 2013-01-07 20:52:39 +0000 | [diff] [blame] | 733 | np_info(np, "local IP %pI4\n", &np->local_ip.ip); |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 734 | } else { |
| 735 | #if IS_ENABLED(CONFIG_IPV6) |
| 736 | struct inet6_dev *idev; |
| 737 | |
| 738 | err = -EDESTADDRREQ; |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 739 | idev = __in6_dev_get(ndev); |
| 740 | if (idev) { |
| 741 | struct inet6_ifaddr *ifp; |
| 742 | |
| 743 | read_lock_bh(&idev->lock); |
| 744 | list_for_each_entry(ifp, &idev->addr_list, if_list) { |
| 745 | if (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL) |
| 746 | continue; |
| 747 | np->local_ip.in6 = ifp->addr; |
| 748 | err = 0; |
| 749 | break; |
| 750 | } |
| 751 | read_unlock_bh(&idev->lock); |
| 752 | } |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 753 | if (err) { |
| 754 | np_err(np, "no IPv6 address for %s, aborting\n", |
| 755 | np->dev_name); |
| 756 | goto put; |
| 757 | } else |
| 758 | np_info(np, "local IPv6 %pI6c\n", &np->local_ip.in6); |
| 759 | #else |
| 760 | np_err(np, "IPv6 is not supported %s, aborting\n", |
| 761 | np->dev_name); |
Cong Wang | e39363a | 2013-01-22 17:39:11 +0000 | [diff] [blame] | 762 | err = -EINVAL; |
Cong Wang | b3d936f | 2013-01-07 20:52:41 +0000 | [diff] [blame] | 763 | goto put; |
| 764 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | } |
| 767 | |
Herbert Xu | dbaa154 | 2010-06-10 16:12:46 +0000 | [diff] [blame] | 768 | /* fill up the skb queue */ |
| 769 | refill_skbs(); |
| 770 | |
Eric W. Biederman | a8779ec | 2014-03-27 15:36:38 -0700 | [diff] [blame] | 771 | err = __netpoll_setup(np, ndev); |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 772 | if (err) |
| 773 | goto put; |
| 774 | |
Cong Wang | f92d318 | 2013-01-14 23:34:06 +0000 | [diff] [blame] | 775 | rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | return 0; |
| 777 | |
Jiri Slaby | 21edbb2 | 2010-03-16 05:29:54 +0000 | [diff] [blame] | 778 | put: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | dev_put(ndev); |
Cong Wang | f92d318 | 2013-01-14 23:34:06 +0000 | [diff] [blame] | 780 | unlock: |
| 781 | rtnl_unlock(); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 782 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | } |
Eric Dumazet | 9e34a5b | 2010-07-09 21:22:04 +0000 | [diff] [blame] | 784 | EXPORT_SYMBOL(netpoll_setup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 786 | static int __init netpoll_init(void) |
| 787 | { |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 788 | skb_queue_head_init(&skb_pool); |
| 789 | return 0; |
| 790 | } |
| 791 | core_initcall(netpoll_init); |
| 792 | |
Amerigo Wang | 38e6bc1 | 2012-08-10 01:24:38 +0000 | [diff] [blame] | 793 | static void rcu_cleanup_netpoll_info(struct rcu_head *rcu_head) |
| 794 | { |
| 795 | struct netpoll_info *npinfo = |
| 796 | container_of(rcu_head, struct netpoll_info, rcu); |
| 797 | |
Amerigo Wang | 38e6bc1 | 2012-08-10 01:24:38 +0000 | [diff] [blame] | 798 | skb_queue_purge(&npinfo->txq); |
| 799 | |
| 800 | /* we can't call cancel_delayed_work_sync here, as we are in softirq */ |
| 801 | cancel_delayed_work(&npinfo->tx_work); |
| 802 | |
| 803 | /* clean after last, unfinished work */ |
| 804 | __skb_queue_purge(&npinfo->txq); |
| 805 | /* now cancel it again */ |
| 806 | cancel_delayed_work(&npinfo->tx_work); |
| 807 | kfree(npinfo); |
| 808 | } |
| 809 | |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 810 | void __netpoll_cleanup(struct netpoll *np) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | { |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 812 | struct netpoll_info *npinfo; |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 813 | |
Neil Horman | 0790bbb | 2013-02-11 10:25:31 +0000 | [diff] [blame] | 814 | /* rtnl_dereference would be preferable here but |
| 815 | * rcu_cleanup_netpoll path can put us in here safely without |
| 816 | * holding the rtnl, so plain rcu_dereference it is |
| 817 | */ |
| 818 | npinfo = rtnl_dereference(np->dev->npinfo); |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 819 | if (!npinfo) |
Herbert Xu | dbaa154 | 2010-06-10 16:12:46 +0000 | [diff] [blame] | 820 | return; |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 821 | |
Neil Horman | ca99ca1 | 2013-02-05 08:05:43 +0000 | [diff] [blame] | 822 | synchronize_srcu(&netpoll_srcu); |
| 823 | |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 824 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
| 825 | const struct net_device_ops *ops; |
| 826 | |
| 827 | ops = np->dev->netdev_ops; |
| 828 | if (ops->ndo_netpoll_cleanup) |
| 829 | ops->ndo_netpoll_cleanup(np->dev); |
| 830 | |
Monam Agarwal | fcb144b | 2014-03-24 00:42:46 +0530 | [diff] [blame] | 831 | RCU_INIT_POINTER(np->dev->npinfo, NULL); |
Amerigo Wang | 38e6bc1 | 2012-08-10 01:24:38 +0000 | [diff] [blame] | 832 | call_rcu_bh(&npinfo->rcu, rcu_cleanup_netpoll_info); |
david decotigny | efa95b0 | 2014-07-08 15:14:41 -0700 | [diff] [blame] | 833 | } else |
| 834 | RCU_INIT_POINTER(np->dev->npinfo, NULL); |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 835 | } |
| 836 | EXPORT_SYMBOL_GPL(__netpoll_cleanup); |
| 837 | |
Neil Horman | 2cde6ac | 2013-02-11 10:25:30 +0000 | [diff] [blame] | 838 | static void netpoll_async_cleanup(struct work_struct *work) |
Amerigo Wang | 38e6bc1 | 2012-08-10 01:24:38 +0000 | [diff] [blame] | 839 | { |
Neil Horman | 2cde6ac | 2013-02-11 10:25:30 +0000 | [diff] [blame] | 840 | struct netpoll *np = container_of(work, struct netpoll, cleanup_work); |
Amerigo Wang | 38e6bc1 | 2012-08-10 01:24:38 +0000 | [diff] [blame] | 841 | |
Neil Horman | 2cde6ac | 2013-02-11 10:25:30 +0000 | [diff] [blame] | 842 | rtnl_lock(); |
Amerigo Wang | 38e6bc1 | 2012-08-10 01:24:38 +0000 | [diff] [blame] | 843 | __netpoll_cleanup(np); |
Neil Horman | 2cde6ac | 2013-02-11 10:25:30 +0000 | [diff] [blame] | 844 | rtnl_unlock(); |
Amerigo Wang | 38e6bc1 | 2012-08-10 01:24:38 +0000 | [diff] [blame] | 845 | kfree(np); |
| 846 | } |
| 847 | |
Neil Horman | 2cde6ac | 2013-02-11 10:25:30 +0000 | [diff] [blame] | 848 | void __netpoll_free_async(struct netpoll *np) |
Amerigo Wang | 38e6bc1 | 2012-08-10 01:24:38 +0000 | [diff] [blame] | 849 | { |
Neil Horman | 2cde6ac | 2013-02-11 10:25:30 +0000 | [diff] [blame] | 850 | schedule_work(&np->cleanup_work); |
Amerigo Wang | 38e6bc1 | 2012-08-10 01:24:38 +0000 | [diff] [blame] | 851 | } |
Neil Horman | 2cde6ac | 2013-02-11 10:25:30 +0000 | [diff] [blame] | 852 | EXPORT_SYMBOL_GPL(__netpoll_free_async); |
Amerigo Wang | 38e6bc1 | 2012-08-10 01:24:38 +0000 | [diff] [blame] | 853 | |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 854 | void netpoll_cleanup(struct netpoll *np) |
| 855 | { |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 856 | rtnl_lock(); |
Nikolay Aleksandrov | d0fe8c88 | 2013-09-19 15:02:35 +0200 | [diff] [blame] | 857 | if (!np->dev) |
| 858 | goto out; |
Herbert Xu | 8fdd95e | 2010-06-10 16:12:48 +0000 | [diff] [blame] | 859 | __netpoll_cleanup(np); |
Herbert Xu | dbaa154 | 2010-06-10 16:12:46 +0000 | [diff] [blame] | 860 | dev_put(np->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | np->dev = NULL; |
Nikolay Aleksandrov | d0fe8c88 | 2013-09-19 15:02:35 +0200 | [diff] [blame] | 862 | out: |
| 863 | rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | } |
Eric Dumazet | 9e34a5b | 2010-07-09 21:22:04 +0000 | [diff] [blame] | 865 | EXPORT_SYMBOL(netpoll_cleanup); |