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1/*
2 * Copyright Gavin Shan, IBM Corporation 2016.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 */
9
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/netdevice.h>
14#include <linux/skbuff.h>
15
16#include <net/ncsi.h>
17#include <net/net_namespace.h>
18#include <net/sock.h>
19
20#include "internal.h"
21#include "ncsi-pkt.h"
22
23static int ncsi_validate_aen_pkt(struct ncsi_aen_pkt_hdr *h,
24 const unsigned short payload)
25{
26 u32 checksum;
27 __be32 *pchecksum;
28
29 if (h->common.revision != NCSI_PKT_REVISION)
30 return -EINVAL;
31 if (ntohs(h->common.length) != payload)
32 return -EINVAL;
33
34 /* Validate checksum, which might be zeroes if the
35 * sender doesn't support checksum according to NCSI
36 * specification.
37 */
38 pchecksum = (__be32 *)((void *)(h + 1) + payload - 4);
39 if (ntohl(*pchecksum) == 0)
40 return 0;
41
42 checksum = ncsi_calculate_checksum((unsigned char *)h,
43 sizeof(*h) + payload - 4);
44 if (*pchecksum != htonl(checksum))
45 return -EINVAL;
46
47 return 0;
48}
49
50static int ncsi_aen_handler_lsc(struct ncsi_dev_priv *ndp,
51 struct ncsi_aen_pkt_hdr *h)
52{
53 struct ncsi_aen_lsc_pkt *lsc;
54 struct ncsi_channel *nc;
55 struct ncsi_channel_mode *ncm;
56 bool chained;
57 int state;
58 unsigned long old_data, data;
59 unsigned long flags;
60
61 /* Find the NCSI channel */
62 ncsi_find_package_and_channel(ndp, h->common.channel, NULL, &nc);
63 if (!nc)
64 return -ENODEV;
65
66 /* Update the link status */
67 lsc = (struct ncsi_aen_lsc_pkt *)h;
68
69 spin_lock_irqsave(&nc->lock, flags);
70 ncm = &nc->modes[NCSI_MODE_LINK];
71 old_data = ncm->data[2];
72 data = ntohl(lsc->status);
73 ncm->data[2] = data;
74 ncm->data[4] = ntohl(lsc->oem_status);
75
76 netdev_info(ndp->ndev.dev, "NCSI: LSC AEN - channel %u state %s\n",
77 nc->id, data & 0x1 ? "up" : "down");
78
79 chained = !list_empty(&nc->link);
80 state = nc->state;
81 spin_unlock_irqrestore(&nc->lock, flags);
82
83 if (!((old_data ^ data) & 0x1) || chained)
84 return 0;
85 if (!(state == NCSI_CHANNEL_INACTIVE && (data & 0x1)) &&
86 !(state == NCSI_CHANNEL_ACTIVE && !(data & 0x1)))
87 return 0;
88
89 if (!(ndp->flags & NCSI_DEV_HWA) &&
90 state == NCSI_CHANNEL_ACTIVE)
91 ndp->flags |= NCSI_DEV_RESHUFFLE;
92
93 ncsi_stop_channel_monitor(nc);
94 spin_lock_irqsave(&ndp->lock, flags);
95 list_add_tail_rcu(&nc->link, &ndp->channel_queue);
96 spin_unlock_irqrestore(&ndp->lock, flags);
97
98 return ncsi_process_next_channel(ndp);
99}
100
101static int ncsi_aen_handler_cr(struct ncsi_dev_priv *ndp,
102 struct ncsi_aen_pkt_hdr *h)
103{
104 struct ncsi_channel *nc;
105 unsigned long flags;
106
107 /* Find the NCSI channel */
108 ncsi_find_package_and_channel(ndp, h->common.channel, NULL, &nc);
109 if (!nc)
110 return -ENODEV;
111
112 spin_lock_irqsave(&nc->lock, flags);
113 if (!list_empty(&nc->link) ||
114 nc->state != NCSI_CHANNEL_ACTIVE) {
115 spin_unlock_irqrestore(&nc->lock, flags);
116 return 0;
117 }
118 spin_unlock_irqrestore(&nc->lock, flags);
119
120 ncsi_stop_channel_monitor(nc);
121 spin_lock_irqsave(&nc->lock, flags);
122 nc->state = NCSI_CHANNEL_INVISIBLE;
123 spin_unlock_irqrestore(&nc->lock, flags);
124
125 spin_lock_irqsave(&ndp->lock, flags);
126 nc->state = NCSI_CHANNEL_INACTIVE;
127 list_add_tail_rcu(&nc->link, &ndp->channel_queue);
128 spin_unlock_irqrestore(&ndp->lock, flags);
129
130 return ncsi_process_next_channel(ndp);
131}
132
133static int ncsi_aen_handler_hncdsc(struct ncsi_dev_priv *ndp,
134 struct ncsi_aen_pkt_hdr *h)
135{
136 struct ncsi_channel *nc;
137 struct ncsi_channel_mode *ncm;
138 struct ncsi_aen_hncdsc_pkt *hncdsc;
139 unsigned long flags;
140
141 /* Find the NCSI channel */
142 ncsi_find_package_and_channel(ndp, h->common.channel, NULL, &nc);
143 if (!nc)
144 return -ENODEV;
145
146 spin_lock_irqsave(&nc->lock, flags);
147 ncm = &nc->modes[NCSI_MODE_LINK];
148 hncdsc = (struct ncsi_aen_hncdsc_pkt *)h;
149 ncm->data[3] = ntohl(hncdsc->status);
150 spin_unlock_irqrestore(&nc->lock, flags);
151 netdev_printk(KERN_DEBUG, ndp->ndev.dev,
152 "NCSI: host driver %srunning on channel %u\n",
153 ncm->data[3] & 0x1 ? "" : "not ", nc->id);
154
155 return 0;
156}
157
158static struct ncsi_aen_handler {
159 unsigned char type;
160 int payload;
161 int (*handler)(struct ncsi_dev_priv *ndp,
162 struct ncsi_aen_pkt_hdr *h);
163} ncsi_aen_handlers[] = {
164 { NCSI_PKT_AEN_LSC, 12, ncsi_aen_handler_lsc },
165 { NCSI_PKT_AEN_CR, 4, ncsi_aen_handler_cr },
166 { NCSI_PKT_AEN_HNCDSC, 8, ncsi_aen_handler_hncdsc }
167};
168
169int ncsi_aen_handler(struct ncsi_dev_priv *ndp, struct sk_buff *skb)
170{
171 struct ncsi_aen_pkt_hdr *h;
172 struct ncsi_aen_handler *nah = NULL;
173 int i, ret;
174
175 /* Find the handler */
176 h = (struct ncsi_aen_pkt_hdr *)skb_network_header(skb);
177 for (i = 0; i < ARRAY_SIZE(ncsi_aen_handlers); i++) {
178 if (ncsi_aen_handlers[i].type == h->type) {
179 nah = &ncsi_aen_handlers[i];
180 break;
181 }
182 }
183
184 if (!nah) {
185 netdev_warn(ndp->ndev.dev, "Invalid AEN (0x%x) received\n",
186 h->type);
187 return -ENOENT;
188 }
189
190 ret = ncsi_validate_aen_pkt(h, nah->payload);
191 if (ret) {
192 netdev_warn(ndp->ndev.dev,
193 "NCSI: 'bad' packet ignored for AEN type 0x%x\n",
194 h->type);
195 goto out;
196 }
197
198 ret = nah->handler(ndp, h);
199 if (ret)
200 netdev_err(ndp->ndev.dev,
201 "NCSI: Handler for AEN type 0x%x returned %d\n",
202 h->type, ret);
203out:
204 consume_skb(skb);
205 return ret;
206}