linux/net/ncsi/ncsi-aen.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

246 lines
6.1 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright Gavin Shan, IBM Corporation 2016.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/ncsi.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include "internal.h"
#include "ncsi-pkt.h"
static int ncsi_validate_aen_pkt(struct ncsi_aen_pkt_hdr *h,
const unsigned short payload)
{
u32 checksum;
__be32 *pchecksum;
if (h->common.revision != NCSI_PKT_REVISION)
return -EINVAL;
if (ntohs(h->common.length) != payload)
return -EINVAL;
/* Validate checksum, which might be zeroes if the
* sender doesn't support checksum according to NCSI
* specification.
*/
pchecksum = (__be32 *)((void *)(h + 1) + payload - 4);
if (ntohl(*pchecksum) == 0)
return 0;
checksum = ncsi_calculate_checksum((unsigned char *)h,
sizeof(*h) + payload - 4);
if (*pchecksum != htonl(checksum))
return -EINVAL;
return 0;
}
static int ncsi_aen_handler_lsc(struct ncsi_dev_priv *ndp,
struct ncsi_aen_pkt_hdr *h)
{
struct ncsi_channel *nc, *tmp;
struct ncsi_channel_mode *ncm;
unsigned long old_data, data;
struct ncsi_aen_lsc_pkt *lsc;
struct ncsi_package *np;
bool had_link, has_link;
unsigned long flags;
bool chained;
int state;
/* Find the NCSI channel */
ncsi_find_package_and_channel(ndp, h->common.channel, NULL, &nc);
if (!nc)
return -ENODEV;
/* Update the link status */
lsc = (struct ncsi_aen_lsc_pkt *)h;
spin_lock_irqsave(&nc->lock, flags);
ncm = &nc->modes[NCSI_MODE_LINK];
old_data = ncm->data[2];
data = ntohl(lsc->status);
ncm->data[2] = data;
ncm->data[4] = ntohl(lsc->oem_status);
had_link = !!(old_data & 0x1);
has_link = !!(data & 0x1);
netdev_dbg(ndp->ndev.dev, "NCSI: LSC AEN - channel %u state %s\n",
nc->id, data & 0x1 ? "up" : "down");
chained = !list_empty(&nc->link);
state = nc->state;
spin_unlock_irqrestore(&nc->lock, flags);
if (state == NCSI_CHANNEL_INACTIVE)
netdev_warn(ndp->ndev.dev,
"NCSI: Inactive channel %u received AEN!\n",
nc->id);
if ((had_link == has_link) || chained)
return 0;
if (!ndp->multi_package && !nc->package->multi_channel) {
if (had_link) {
ndp->flags |= NCSI_DEV_RESHUFFLE;
ncsi_stop_channel_monitor(nc);
spin_lock_irqsave(&ndp->lock, flags);
list_add_tail_rcu(&nc->link, &ndp->channel_queue);
spin_unlock_irqrestore(&ndp->lock, flags);
return ncsi_process_next_channel(ndp);
}
/* Configured channel came up */
return 0;
}
if (had_link) {
ncm = &nc->modes[NCSI_MODE_TX_ENABLE];
if (ncsi_channel_is_last(ndp, nc)) {
/* No channels left, reconfigure */
return ncsi_reset_dev(&ndp->ndev);
} else if (ncm->enable) {
/* Need to failover Tx channel */
ncsi_update_tx_channel(ndp, nc->package, nc, NULL);
}
} else if (has_link && nc->package->preferred_channel == nc) {
/* Return Tx to preferred channel */
ncsi_update_tx_channel(ndp, nc->package, NULL, nc);
} else if (has_link) {
NCSI_FOR_EACH_PACKAGE(ndp, np) {
NCSI_FOR_EACH_CHANNEL(np, tmp) {
/* Enable Tx on this channel if the current Tx
* channel is down.
*/
ncm = &tmp->modes[NCSI_MODE_TX_ENABLE];
if (ncm->enable &&
!ncsi_channel_has_link(tmp)) {
ncsi_update_tx_channel(ndp, nc->package,
tmp, nc);
break;
}
}
}
}
/* Leave configured channels active in a multi-channel scenario so
* AEN events are still received.
*/
return 0;
}
static int ncsi_aen_handler_cr(struct ncsi_dev_priv *ndp,
struct ncsi_aen_pkt_hdr *h)
{
struct ncsi_channel *nc;
unsigned long flags;
/* Find the NCSI channel */
ncsi_find_package_and_channel(ndp, h->common.channel, NULL, &nc);
if (!nc)
return -ENODEV;
spin_lock_irqsave(&nc->lock, flags);
if (!list_empty(&nc->link) ||
nc->state != NCSI_CHANNEL_ACTIVE) {
spin_unlock_irqrestore(&nc->lock, flags);
return 0;
}
spin_unlock_irqrestore(&nc->lock, flags);
ncsi_stop_channel_monitor(nc);
spin_lock_irqsave(&nc->lock, flags);
nc->state = NCSI_CHANNEL_INVISIBLE;
spin_unlock_irqrestore(&nc->lock, flags);
spin_lock_irqsave(&ndp->lock, flags);
nc->state = NCSI_CHANNEL_INACTIVE;
list_add_tail_rcu(&nc->link, &ndp->channel_queue);
spin_unlock_irqrestore(&ndp->lock, flags);
return ncsi_process_next_channel(ndp);
}
static int ncsi_aen_handler_hncdsc(struct ncsi_dev_priv *ndp,
struct ncsi_aen_pkt_hdr *h)
{
struct ncsi_channel *nc;
struct ncsi_channel_mode *ncm;
struct ncsi_aen_hncdsc_pkt *hncdsc;
unsigned long flags;
/* Find the NCSI channel */
ncsi_find_package_and_channel(ndp, h->common.channel, NULL, &nc);
if (!nc)
return -ENODEV;
spin_lock_irqsave(&nc->lock, flags);
ncm = &nc->modes[NCSI_MODE_LINK];
hncdsc = (struct ncsi_aen_hncdsc_pkt *)h;
ncm->data[3] = ntohl(hncdsc->status);
spin_unlock_irqrestore(&nc->lock, flags);
netdev_dbg(ndp->ndev.dev,
"NCSI: host driver %srunning on channel %u\n",
ncm->data[3] & 0x1 ? "" : "not ", nc->id);
return 0;
}
static struct ncsi_aen_handler {
unsigned char type;
int payload;
int (*handler)(struct ncsi_dev_priv *ndp,
struct ncsi_aen_pkt_hdr *h);
} ncsi_aen_handlers[] = {
{ NCSI_PKT_AEN_LSC, 12, ncsi_aen_handler_lsc },
{ NCSI_PKT_AEN_CR, 4, ncsi_aen_handler_cr },
{ NCSI_PKT_AEN_HNCDSC, 8, ncsi_aen_handler_hncdsc }
};
int ncsi_aen_handler(struct ncsi_dev_priv *ndp, struct sk_buff *skb)
{
struct ncsi_aen_pkt_hdr *h;
struct ncsi_aen_handler *nah = NULL;
int i, ret;
/* Find the handler */
h = (struct ncsi_aen_pkt_hdr *)skb_network_header(skb);
for (i = 0; i < ARRAY_SIZE(ncsi_aen_handlers); i++) {
if (ncsi_aen_handlers[i].type == h->type) {
nah = &ncsi_aen_handlers[i];
break;
}
}
if (!nah) {
netdev_warn(ndp->ndev.dev, "Invalid AEN (0x%x) received\n",
h->type);
return -ENOENT;
}
ret = ncsi_validate_aen_pkt(h, nah->payload);
if (ret) {
netdev_warn(ndp->ndev.dev,
"NCSI: 'bad' packet ignored for AEN type 0x%x\n",
h->type);
goto out;
}
ret = nah->handler(ndp, h);
if (ret)
netdev_err(ndp->ndev.dev,
"NCSI: Handler for AEN type 0x%x returned %d\n",
h->type, ret);
out:
consume_skb(skb);
return ret;
}