forked from Minki/linux
e043046a5a
The channel_remove() function tests whether its argument is NULL and then returns immediately. Thus the test around the calls is not needed. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1871 lines
47 KiB
C
1871 lines
47 KiB
C
/*
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* Copyright IBM Corp. 2001, 2009
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* Author(s):
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* Original CTC driver(s):
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* Fritz Elfert (felfert@millenux.com)
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* Dieter Wellerdiek (wel@de.ibm.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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* Denis Joseph Barrow (barrow_dj@yahoo.com)
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* Jochen Roehrig (roehrig@de.ibm.com)
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* Cornelia Huck <cornelia.huck@de.ibm.com>
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* MPC additions:
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* Belinda Thompson (belindat@us.ibm.com)
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* Andy Richter (richtera@us.ibm.com)
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* Revived by:
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* Peter Tiedemann (ptiedem@de.ibm.com)
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*/
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#undef DEBUG
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#undef DEBUGDATA
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#undef DEBUGCCW
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#define KMSG_COMPONENT "ctcm"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/timer.h>
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#include <linux/bitops.h>
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#include <linux/signal.h>
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#include <linux/string.h>
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#include <linux/ip.h>
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#include <linux/if_arp.h>
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#include <linux/tcp.h>
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#include <linux/skbuff.h>
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#include <linux/ctype.h>
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#include <net/dst.h>
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#include <linux/io.h>
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#include <asm/ccwdev.h>
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#include <asm/ccwgroup.h>
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#include <linux/uaccess.h>
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#include <asm/idals.h>
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#include "ctcm_fsms.h"
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#include "ctcm_main.h"
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/* Some common global variables */
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/**
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* The root device for ctcm group devices
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*/
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static struct device *ctcm_root_dev;
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/*
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* Linked list of all detected channels.
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*/
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struct channel *channels;
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/**
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* Unpack a just received skb and hand it over to
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* upper layers.
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*
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* ch The channel where this skb has been received.
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* pskb The received skb.
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*/
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void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
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{
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struct net_device *dev = ch->netdev;
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struct ctcm_priv *priv = dev->ml_priv;
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__u16 len = *((__u16 *) pskb->data);
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skb_put(pskb, 2 + LL_HEADER_LENGTH);
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skb_pull(pskb, 2);
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pskb->dev = dev;
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pskb->ip_summed = CHECKSUM_UNNECESSARY;
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while (len > 0) {
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struct sk_buff *skb;
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int skblen;
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struct ll_header *header = (struct ll_header *)pskb->data;
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skb_pull(pskb, LL_HEADER_LENGTH);
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if ((ch->protocol == CTCM_PROTO_S390) &&
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(header->type != ETH_P_IP)) {
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if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
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ch->logflags |= LOG_FLAG_ILLEGALPKT;
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/*
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* Check packet type only if we stick strictly
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* to S/390's protocol of OS390. This only
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* supports IP. Otherwise allow any packet
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* type.
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*/
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CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
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"%s(%s): Illegal packet type 0x%04x"
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" - dropping",
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CTCM_FUNTAIL, dev->name, header->type);
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}
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priv->stats.rx_dropped++;
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priv->stats.rx_frame_errors++;
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return;
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}
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pskb->protocol = ntohs(header->type);
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if ((header->length <= LL_HEADER_LENGTH) ||
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(len <= LL_HEADER_LENGTH)) {
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if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
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CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
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"%s(%s): Illegal packet size %d(%d,%d)"
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"- dropping",
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CTCM_FUNTAIL, dev->name,
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header->length, dev->mtu, len);
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ch->logflags |= LOG_FLAG_ILLEGALSIZE;
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}
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priv->stats.rx_dropped++;
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priv->stats.rx_length_errors++;
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return;
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}
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header->length -= LL_HEADER_LENGTH;
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len -= LL_HEADER_LENGTH;
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if ((header->length > skb_tailroom(pskb)) ||
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(header->length > len)) {
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if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
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CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
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"%s(%s): Packet size %d (overrun)"
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" - dropping", CTCM_FUNTAIL,
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dev->name, header->length);
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ch->logflags |= LOG_FLAG_OVERRUN;
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}
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priv->stats.rx_dropped++;
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priv->stats.rx_length_errors++;
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return;
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}
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skb_put(pskb, header->length);
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skb_reset_mac_header(pskb);
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len -= header->length;
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skb = dev_alloc_skb(pskb->len);
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if (!skb) {
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if (!(ch->logflags & LOG_FLAG_NOMEM)) {
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CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
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"%s(%s): MEMORY allocation error",
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CTCM_FUNTAIL, dev->name);
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ch->logflags |= LOG_FLAG_NOMEM;
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}
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priv->stats.rx_dropped++;
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return;
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}
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skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
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pskb->len);
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skb_reset_mac_header(skb);
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skb->dev = pskb->dev;
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skb->protocol = pskb->protocol;
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pskb->ip_summed = CHECKSUM_UNNECESSARY;
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skblen = skb->len;
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/*
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* reset logflags
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*/
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ch->logflags = 0;
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priv->stats.rx_packets++;
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priv->stats.rx_bytes += skblen;
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netif_rx_ni(skb);
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if (len > 0) {
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skb_pull(pskb, header->length);
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if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
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CTCM_DBF_DEV_NAME(TRACE, dev,
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"Overrun in ctcm_unpack_skb");
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ch->logflags |= LOG_FLAG_OVERRUN;
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return;
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}
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skb_put(pskb, LL_HEADER_LENGTH);
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}
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}
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}
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/**
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* Release a specific channel in the channel list.
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*
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* ch Pointer to channel struct to be released.
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*/
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static void channel_free(struct channel *ch)
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{
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CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
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ch->flags &= ~CHANNEL_FLAGS_INUSE;
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fsm_newstate(ch->fsm, CTC_STATE_IDLE);
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}
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/**
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* Remove a specific channel in the channel list.
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*
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* ch Pointer to channel struct to be released.
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*/
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static void channel_remove(struct channel *ch)
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{
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struct channel **c = &channels;
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char chid[CTCM_ID_SIZE+1];
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int ok = 0;
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if (ch == NULL)
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return;
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else
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strncpy(chid, ch->id, CTCM_ID_SIZE);
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channel_free(ch);
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while (*c) {
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if (*c == ch) {
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*c = ch->next;
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fsm_deltimer(&ch->timer);
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if (IS_MPC(ch))
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fsm_deltimer(&ch->sweep_timer);
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kfree_fsm(ch->fsm);
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clear_normalized_cda(&ch->ccw[4]);
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if (ch->trans_skb != NULL) {
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clear_normalized_cda(&ch->ccw[1]);
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dev_kfree_skb_any(ch->trans_skb);
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}
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if (IS_MPC(ch)) {
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tasklet_kill(&ch->ch_tasklet);
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tasklet_kill(&ch->ch_disc_tasklet);
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kfree(ch->discontact_th);
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}
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kfree(ch->ccw);
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kfree(ch->irb);
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kfree(ch);
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ok = 1;
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break;
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}
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c = &((*c)->next);
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}
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CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
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chid, ok ? "OK" : "failed");
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}
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/**
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* Get a specific channel from the channel list.
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*
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* type Type of channel we are interested in.
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* id Id of channel we are interested in.
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* direction Direction we want to use this channel for.
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*
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* returns Pointer to a channel or NULL if no matching channel available.
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*/
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static struct channel *channel_get(enum ctcm_channel_types type,
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char *id, int direction)
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{
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struct channel *ch = channels;
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while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
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ch = ch->next;
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if (!ch) {
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CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
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"%s(%d, %s, %d) not found in channel list\n",
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CTCM_FUNTAIL, type, id, direction);
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} else {
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if (ch->flags & CHANNEL_FLAGS_INUSE)
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ch = NULL;
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else {
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ch->flags |= CHANNEL_FLAGS_INUSE;
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ch->flags &= ~CHANNEL_FLAGS_RWMASK;
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ch->flags |= (direction == CTCM_WRITE)
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? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
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fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
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}
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}
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return ch;
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}
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static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
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{
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if (!IS_ERR(irb))
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return 0;
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CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
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"irb error %ld on device %s\n",
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PTR_ERR(irb), dev_name(&cdev->dev));
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switch (PTR_ERR(irb)) {
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case -EIO:
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dev_err(&cdev->dev,
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"An I/O-error occurred on the CTCM device\n");
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break;
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case -ETIMEDOUT:
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dev_err(&cdev->dev,
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"An adapter hardware operation timed out\n");
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break;
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default:
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dev_err(&cdev->dev,
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"An error occurred on the adapter hardware\n");
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}
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return PTR_ERR(irb);
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}
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/**
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* Check sense of a unit check.
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*
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* ch The channel, the sense code belongs to.
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* sense The sense code to inspect.
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*/
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static inline void ccw_unit_check(struct channel *ch, __u8 sense)
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{
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CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
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"%s(%s): %02x",
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CTCM_FUNTAIL, ch->id, sense);
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if (sense & SNS0_INTERVENTION_REQ) {
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if (sense & 0x01) {
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if (ch->sense_rc != 0x01) {
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pr_notice(
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"%s: The communication peer has "
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"disconnected\n", ch->id);
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ch->sense_rc = 0x01;
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}
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fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
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} else {
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if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
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pr_notice(
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"%s: The remote operating system is "
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"not available\n", ch->id);
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ch->sense_rc = SNS0_INTERVENTION_REQ;
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}
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fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
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}
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} else if (sense & SNS0_EQUIPMENT_CHECK) {
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if (sense & SNS0_BUS_OUT_CHECK) {
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if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
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CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
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"%s(%s): remote HW error %02x",
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CTCM_FUNTAIL, ch->id, sense);
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ch->sense_rc = SNS0_BUS_OUT_CHECK;
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}
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fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
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} else {
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if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
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CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
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"%s(%s): remote read parity error %02x",
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CTCM_FUNTAIL, ch->id, sense);
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ch->sense_rc = SNS0_EQUIPMENT_CHECK;
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}
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fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
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}
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} else if (sense & SNS0_BUS_OUT_CHECK) {
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if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
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CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
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"%s(%s): BUS OUT error %02x",
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CTCM_FUNTAIL, ch->id, sense);
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ch->sense_rc = SNS0_BUS_OUT_CHECK;
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}
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if (sense & 0x04) /* data-streaming timeout */
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fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
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else /* Data-transfer parity error */
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fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
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} else if (sense & SNS0_CMD_REJECT) {
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if (ch->sense_rc != SNS0_CMD_REJECT) {
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CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
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"%s(%s): Command rejected",
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CTCM_FUNTAIL, ch->id);
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ch->sense_rc = SNS0_CMD_REJECT;
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}
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} else if (sense == 0) {
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CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
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"%s(%s): Unit check ZERO",
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CTCM_FUNTAIL, ch->id);
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fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
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} else {
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CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
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"%s(%s): Unit check code %02x unknown",
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CTCM_FUNTAIL, ch->id, sense);
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fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
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}
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}
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int ctcm_ch_alloc_buffer(struct channel *ch)
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{
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clear_normalized_cda(&ch->ccw[1]);
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ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
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if (ch->trans_skb == NULL) {
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CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
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"%s(%s): %s trans_skb allocation error",
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CTCM_FUNTAIL, ch->id,
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(CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
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"RX" : "TX");
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return -ENOMEM;
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}
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ch->ccw[1].count = ch->max_bufsize;
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if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
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dev_kfree_skb(ch->trans_skb);
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ch->trans_skb = NULL;
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CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
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"%s(%s): %s set norm_cda failed",
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CTCM_FUNTAIL, ch->id,
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(CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
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"RX" : "TX");
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return -ENOMEM;
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}
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ch->ccw[1].count = 0;
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ch->trans_skb_data = ch->trans_skb->data;
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ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
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return 0;
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}
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/*
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* Interface API for upper network layers
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*/
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/**
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* Open an interface.
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* Called from generic network layer when ifconfig up is run.
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*
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* dev Pointer to interface struct.
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*
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* returns 0 on success, -ERRNO on failure. (Never fails.)
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*/
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int ctcm_open(struct net_device *dev)
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{
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struct ctcm_priv *priv = dev->ml_priv;
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CTCMY_DBF_DEV_NAME(SETUP, dev, "");
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if (!IS_MPC(priv))
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fsm_event(priv->fsm, DEV_EVENT_START, dev);
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return 0;
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}
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/**
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* Close an interface.
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* Called from generic network layer when ifconfig down is run.
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*
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* dev Pointer to interface struct.
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*
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* returns 0 on success, -ERRNO on failure. (Never fails.)
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*/
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int ctcm_close(struct net_device *dev)
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{
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struct ctcm_priv *priv = dev->ml_priv;
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CTCMY_DBF_DEV_NAME(SETUP, dev, "");
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if (!IS_MPC(priv))
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fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
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return 0;
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}
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/**
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* Transmit a packet.
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* This is a helper function for ctcm_tx().
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*
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* ch Channel to be used for sending.
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* skb Pointer to struct sk_buff of packet to send.
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* The linklevel header has already been set up
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* by ctcm_tx().
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*
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* returns 0 on success, -ERRNO on failure. (Never fails.)
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*/
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static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
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{
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unsigned long saveflags;
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struct ll_header header;
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int rc = 0;
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__u16 block_len;
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int ccw_idx;
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struct sk_buff *nskb;
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unsigned long hi;
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/* we need to acquire the lock for testing the state
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* otherwise we can have an IRQ changing the state to
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* TXIDLE after the test but before acquiring the lock.
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*/
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spin_lock_irqsave(&ch->collect_lock, saveflags);
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if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
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int l = skb->len + LL_HEADER_LENGTH;
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if (ch->collect_len + l > ch->max_bufsize - 2) {
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spin_unlock_irqrestore(&ch->collect_lock, saveflags);
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return -EBUSY;
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} else {
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atomic_inc(&skb->users);
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header.length = l;
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header.type = skb->protocol;
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|
header.unused = 0;
|
|
memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
|
|
LL_HEADER_LENGTH);
|
|
skb_queue_tail(&ch->collect_queue, skb);
|
|
ch->collect_len += l;
|
|
}
|
|
spin_unlock_irqrestore(&ch->collect_lock, saveflags);
|
|
goto done;
|
|
}
|
|
spin_unlock_irqrestore(&ch->collect_lock, saveflags);
|
|
/*
|
|
* Protect skb against beeing free'd by upper
|
|
* layers.
|
|
*/
|
|
atomic_inc(&skb->users);
|
|
ch->prof.txlen += skb->len;
|
|
header.length = skb->len + LL_HEADER_LENGTH;
|
|
header.type = skb->protocol;
|
|
header.unused = 0;
|
|
memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
|
|
block_len = skb->len + 2;
|
|
*((__u16 *)skb_push(skb, 2)) = block_len;
|
|
|
|
/*
|
|
* IDAL support in CTCM is broken, so we have to
|
|
* care about skb's above 2G ourselves.
|
|
*/
|
|
hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
|
|
if (hi) {
|
|
nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
|
|
if (!nskb) {
|
|
atomic_dec(&skb->users);
|
|
skb_pull(skb, LL_HEADER_LENGTH + 2);
|
|
ctcm_clear_busy(ch->netdev);
|
|
return -ENOMEM;
|
|
} else {
|
|
memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
|
|
atomic_inc(&nskb->users);
|
|
atomic_dec(&skb->users);
|
|
dev_kfree_skb_irq(skb);
|
|
skb = nskb;
|
|
}
|
|
}
|
|
|
|
ch->ccw[4].count = block_len;
|
|
if (set_normalized_cda(&ch->ccw[4], skb->data)) {
|
|
/*
|
|
* idal allocation failed, try via copying to
|
|
* trans_skb. trans_skb usually has a pre-allocated
|
|
* idal.
|
|
*/
|
|
if (ctcm_checkalloc_buffer(ch)) {
|
|
/*
|
|
* Remove our header. It gets added
|
|
* again on retransmit.
|
|
*/
|
|
atomic_dec(&skb->users);
|
|
skb_pull(skb, LL_HEADER_LENGTH + 2);
|
|
ctcm_clear_busy(ch->netdev);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
skb_reset_tail_pointer(ch->trans_skb);
|
|
ch->trans_skb->len = 0;
|
|
ch->ccw[1].count = skb->len;
|
|
skb_copy_from_linear_data(skb,
|
|
skb_put(ch->trans_skb, skb->len), skb->len);
|
|
atomic_dec(&skb->users);
|
|
dev_kfree_skb_irq(skb);
|
|
ccw_idx = 0;
|
|
} else {
|
|
skb_queue_tail(&ch->io_queue, skb);
|
|
ccw_idx = 3;
|
|
}
|
|
if (do_debug_ccw)
|
|
ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
|
|
sizeof(struct ccw1) * 3);
|
|
ch->retry = 0;
|
|
fsm_newstate(ch->fsm, CTC_STATE_TX);
|
|
fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
|
|
spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
|
|
ch->prof.send_stamp = jiffies;
|
|
rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
|
|
(unsigned long)ch, 0xff, 0);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
|
|
if (ccw_idx == 3)
|
|
ch->prof.doios_single++;
|
|
if (rc != 0) {
|
|
fsm_deltimer(&ch->timer);
|
|
ctcm_ccw_check_rc(ch, rc, "single skb TX");
|
|
if (ccw_idx == 3)
|
|
skb_dequeue_tail(&ch->io_queue);
|
|
/*
|
|
* Remove our header. It gets added
|
|
* again on retransmit.
|
|
*/
|
|
skb_pull(skb, LL_HEADER_LENGTH + 2);
|
|
} else if (ccw_idx == 0) {
|
|
struct net_device *dev = ch->netdev;
|
|
struct ctcm_priv *priv = dev->ml_priv;
|
|
priv->stats.tx_packets++;
|
|
priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
|
|
}
|
|
done:
|
|
ctcm_clear_busy(ch->netdev);
|
|
return rc;
|
|
}
|
|
|
|
static void ctcmpc_send_sweep_req(struct channel *rch)
|
|
{
|
|
struct net_device *dev = rch->netdev;
|
|
struct ctcm_priv *priv;
|
|
struct mpc_group *grp;
|
|
struct th_sweep *header;
|
|
struct sk_buff *sweep_skb;
|
|
struct channel *ch;
|
|
/* int rc = 0; */
|
|
|
|
priv = dev->ml_priv;
|
|
grp = priv->mpcg;
|
|
ch = priv->channel[CTCM_WRITE];
|
|
|
|
/* sweep processing is not complete until response and request */
|
|
/* has completed for all read channels in group */
|
|
if (grp->in_sweep == 0) {
|
|
grp->in_sweep = 1;
|
|
grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
|
|
grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
|
|
}
|
|
|
|
sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
|
|
|
|
if (sweep_skb == NULL) {
|
|
/* rc = -ENOMEM; */
|
|
goto nomem;
|
|
}
|
|
|
|
header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
|
|
|
|
if (!header) {
|
|
dev_kfree_skb_any(sweep_skb);
|
|
/* rc = -ENOMEM; */
|
|
goto nomem;
|
|
}
|
|
|
|
header->th.th_seg = 0x00 ;
|
|
header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */
|
|
header->th.th_blk_flag = 0x00;
|
|
header->th.th_is_xid = 0x00;
|
|
header->th.th_seq_num = 0x00;
|
|
header->sw.th_last_seq = ch->th_seq_num;
|
|
|
|
memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
|
|
|
|
kfree(header);
|
|
|
|
dev->trans_start = jiffies;
|
|
skb_queue_tail(&ch->sweep_queue, sweep_skb);
|
|
|
|
fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
|
|
|
|
return;
|
|
|
|
nomem:
|
|
grp->in_sweep = 0;
|
|
ctcm_clear_busy(dev);
|
|
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* MPC mode version of transmit_skb
|
|
*/
|
|
static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
|
|
{
|
|
struct pdu *p_header;
|
|
struct net_device *dev = ch->netdev;
|
|
struct ctcm_priv *priv = dev->ml_priv;
|
|
struct mpc_group *grp = priv->mpcg;
|
|
struct th_header *header;
|
|
struct sk_buff *nskb;
|
|
int rc = 0;
|
|
int ccw_idx;
|
|
unsigned long hi;
|
|
unsigned long saveflags = 0; /* avoids compiler warning */
|
|
|
|
CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
|
|
__func__, dev->name, smp_processor_id(), ch,
|
|
ch->id, fsm_getstate_str(ch->fsm));
|
|
|
|
if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
|
|
spin_lock_irqsave(&ch->collect_lock, saveflags);
|
|
atomic_inc(&skb->users);
|
|
p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
|
|
|
|
if (!p_header) {
|
|
spin_unlock_irqrestore(&ch->collect_lock, saveflags);
|
|
goto nomem_exit;
|
|
}
|
|
|
|
p_header->pdu_offset = skb->len;
|
|
p_header->pdu_proto = 0x01;
|
|
p_header->pdu_flag = 0x00;
|
|
if (skb->protocol == ntohs(ETH_P_SNAP)) {
|
|
p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
|
|
} else {
|
|
p_header->pdu_flag |= PDU_FIRST;
|
|
}
|
|
p_header->pdu_seq = 0;
|
|
memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
|
|
PDU_HEADER_LENGTH);
|
|
|
|
CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
|
|
"pdu header and data for up to 32 bytes:\n",
|
|
__func__, dev->name, skb->len);
|
|
CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
|
|
|
|
skb_queue_tail(&ch->collect_queue, skb);
|
|
ch->collect_len += skb->len;
|
|
kfree(p_header);
|
|
|
|
spin_unlock_irqrestore(&ch->collect_lock, saveflags);
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Protect skb against beeing free'd by upper
|
|
* layers.
|
|
*/
|
|
atomic_inc(&skb->users);
|
|
|
|
/*
|
|
* IDAL support in CTCM is broken, so we have to
|
|
* care about skb's above 2G ourselves.
|
|
*/
|
|
hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
|
|
if (hi) {
|
|
nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
|
|
if (!nskb) {
|
|
goto nomem_exit;
|
|
} else {
|
|
memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
|
|
atomic_inc(&nskb->users);
|
|
atomic_dec(&skb->users);
|
|
dev_kfree_skb_irq(skb);
|
|
skb = nskb;
|
|
}
|
|
}
|
|
|
|
p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
|
|
|
|
if (!p_header)
|
|
goto nomem_exit;
|
|
|
|
p_header->pdu_offset = skb->len;
|
|
p_header->pdu_proto = 0x01;
|
|
p_header->pdu_flag = 0x00;
|
|
p_header->pdu_seq = 0;
|
|
if (skb->protocol == ntohs(ETH_P_SNAP)) {
|
|
p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
|
|
} else {
|
|
p_header->pdu_flag |= PDU_FIRST;
|
|
}
|
|
memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
|
|
|
|
kfree(p_header);
|
|
|
|
if (ch->collect_len > 0) {
|
|
spin_lock_irqsave(&ch->collect_lock, saveflags);
|
|
skb_queue_tail(&ch->collect_queue, skb);
|
|
ch->collect_len += skb->len;
|
|
skb = skb_dequeue(&ch->collect_queue);
|
|
ch->collect_len -= skb->len;
|
|
spin_unlock_irqrestore(&ch->collect_lock, saveflags);
|
|
}
|
|
|
|
p_header = (struct pdu *)skb->data;
|
|
p_header->pdu_flag |= PDU_LAST;
|
|
|
|
ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
|
|
|
|
header = kmalloc(TH_HEADER_LENGTH, gfp_type());
|
|
if (!header)
|
|
goto nomem_exit;
|
|
|
|
header->th_seg = 0x00;
|
|
header->th_ch_flag = TH_HAS_PDU; /* Normal data */
|
|
header->th_blk_flag = 0x00;
|
|
header->th_is_xid = 0x00; /* Just data here */
|
|
ch->th_seq_num++;
|
|
header->th_seq_num = ch->th_seq_num;
|
|
|
|
CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
|
|
__func__, dev->name, ch->th_seq_num);
|
|
|
|
/* put the TH on the packet */
|
|
memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
|
|
|
|
kfree(header);
|
|
|
|
CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
|
|
"up to 32 bytes sent to vtam:\n",
|
|
__func__, dev->name, skb->len);
|
|
CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
|
|
|
|
ch->ccw[4].count = skb->len;
|
|
if (set_normalized_cda(&ch->ccw[4], skb->data)) {
|
|
/*
|
|
* idal allocation failed, try via copying to trans_skb.
|
|
* trans_skb usually has a pre-allocated idal.
|
|
*/
|
|
if (ctcm_checkalloc_buffer(ch)) {
|
|
/*
|
|
* Remove our header.
|
|
* It gets added again on retransmit.
|
|
*/
|
|
goto nomem_exit;
|
|
}
|
|
|
|
skb_reset_tail_pointer(ch->trans_skb);
|
|
ch->trans_skb->len = 0;
|
|
ch->ccw[1].count = skb->len;
|
|
memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
|
|
atomic_dec(&skb->users);
|
|
dev_kfree_skb_irq(skb);
|
|
ccw_idx = 0;
|
|
CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
|
|
"up to 32 bytes sent to vtam:\n",
|
|
__func__, dev->name, ch->trans_skb->len);
|
|
CTCM_D3_DUMP((char *)ch->trans_skb->data,
|
|
min_t(int, 32, ch->trans_skb->len));
|
|
} else {
|
|
skb_queue_tail(&ch->io_queue, skb);
|
|
ccw_idx = 3;
|
|
}
|
|
ch->retry = 0;
|
|
fsm_newstate(ch->fsm, CTC_STATE_TX);
|
|
fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
|
|
|
|
if (do_debug_ccw)
|
|
ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
|
|
sizeof(struct ccw1) * 3);
|
|
|
|
spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
|
|
ch->prof.send_stamp = jiffies;
|
|
rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
|
|
(unsigned long)ch, 0xff, 0);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
|
|
if (ccw_idx == 3)
|
|
ch->prof.doios_single++;
|
|
if (rc != 0) {
|
|
fsm_deltimer(&ch->timer);
|
|
ctcm_ccw_check_rc(ch, rc, "single skb TX");
|
|
if (ccw_idx == 3)
|
|
skb_dequeue_tail(&ch->io_queue);
|
|
} else if (ccw_idx == 0) {
|
|
priv->stats.tx_packets++;
|
|
priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
|
|
}
|
|
if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
|
|
ctcmpc_send_sweep_req(ch);
|
|
|
|
goto done;
|
|
nomem_exit:
|
|
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
|
|
"%s(%s): MEMORY allocation ERROR\n",
|
|
CTCM_FUNTAIL, ch->id);
|
|
rc = -ENOMEM;
|
|
atomic_dec(&skb->users);
|
|
dev_kfree_skb_any(skb);
|
|
fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
|
|
done:
|
|
CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* Start transmission of a packet.
|
|
* Called from generic network device layer.
|
|
*
|
|
* skb Pointer to buffer containing the packet.
|
|
* dev Pointer to interface struct.
|
|
*
|
|
* returns 0 if packet consumed, !0 if packet rejected.
|
|
* Note: If we return !0, then the packet is free'd by
|
|
* the generic network layer.
|
|
*/
|
|
/* first merge version - leaving both functions separated */
|
|
static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct ctcm_priv *priv = dev->ml_priv;
|
|
|
|
if (skb == NULL) {
|
|
CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
|
|
"%s(%s): NULL sk_buff passed",
|
|
CTCM_FUNTAIL, dev->name);
|
|
priv->stats.tx_dropped++;
|
|
return NETDEV_TX_OK;
|
|
}
|
|
if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
|
|
CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
|
|
"%s(%s): Got sk_buff with head room < %ld bytes",
|
|
CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
|
|
dev_kfree_skb(skb);
|
|
priv->stats.tx_dropped++;
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
/*
|
|
* If channels are not running, try to restart them
|
|
* and throw away packet.
|
|
*/
|
|
if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
|
|
fsm_event(priv->fsm, DEV_EVENT_START, dev);
|
|
dev_kfree_skb(skb);
|
|
priv->stats.tx_dropped++;
|
|
priv->stats.tx_errors++;
|
|
priv->stats.tx_carrier_errors++;
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
if (ctcm_test_and_set_busy(dev))
|
|
return NETDEV_TX_BUSY;
|
|
|
|
dev->trans_start = jiffies;
|
|
if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
|
|
return NETDEV_TX_BUSY;
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
/* unmerged MPC variant of ctcm_tx */
|
|
static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
int len = 0;
|
|
struct ctcm_priv *priv = dev->ml_priv;
|
|
struct mpc_group *grp = priv->mpcg;
|
|
struct sk_buff *newskb = NULL;
|
|
|
|
/*
|
|
* Some sanity checks ...
|
|
*/
|
|
if (skb == NULL) {
|
|
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
|
|
"%s(%s): NULL sk_buff passed",
|
|
CTCM_FUNTAIL, dev->name);
|
|
priv->stats.tx_dropped++;
|
|
goto done;
|
|
}
|
|
if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
|
|
CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
|
|
"%s(%s): Got sk_buff with head room < %ld bytes",
|
|
CTCM_FUNTAIL, dev->name,
|
|
TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
|
|
|
|
CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
|
|
|
|
len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
|
|
newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
|
|
|
|
if (!newskb) {
|
|
CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
|
|
"%s: %s: __dev_alloc_skb failed",
|
|
__func__, dev->name);
|
|
|
|
dev_kfree_skb_any(skb);
|
|
priv->stats.tx_dropped++;
|
|
priv->stats.tx_errors++;
|
|
priv->stats.tx_carrier_errors++;
|
|
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
|
|
goto done;
|
|
}
|
|
newskb->protocol = skb->protocol;
|
|
skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
|
|
memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
|
|
dev_kfree_skb_any(skb);
|
|
skb = newskb;
|
|
}
|
|
|
|
/*
|
|
* If channels are not running,
|
|
* notify anybody about a link failure and throw
|
|
* away packet.
|
|
*/
|
|
if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
|
|
(fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
|
|
dev_kfree_skb_any(skb);
|
|
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
|
|
"%s(%s): inactive MPCGROUP - dropped",
|
|
CTCM_FUNTAIL, dev->name);
|
|
priv->stats.tx_dropped++;
|
|
priv->stats.tx_errors++;
|
|
priv->stats.tx_carrier_errors++;
|
|
goto done;
|
|
}
|
|
|
|
if (ctcm_test_and_set_busy(dev)) {
|
|
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
|
|
"%s(%s): device busy - dropped",
|
|
CTCM_FUNTAIL, dev->name);
|
|
dev_kfree_skb_any(skb);
|
|
priv->stats.tx_dropped++;
|
|
priv->stats.tx_errors++;
|
|
priv->stats.tx_carrier_errors++;
|
|
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
|
|
goto done;
|
|
}
|
|
|
|
dev->trans_start = jiffies;
|
|
if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
|
|
CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
|
|
"%s(%s): device error - dropped",
|
|
CTCM_FUNTAIL, dev->name);
|
|
dev_kfree_skb_any(skb);
|
|
priv->stats.tx_dropped++;
|
|
priv->stats.tx_errors++;
|
|
priv->stats.tx_carrier_errors++;
|
|
ctcm_clear_busy(dev);
|
|
fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
|
|
goto done;
|
|
}
|
|
ctcm_clear_busy(dev);
|
|
done:
|
|
if (do_debug)
|
|
MPC_DBF_DEV_NAME(TRACE, dev, "exit");
|
|
|
|
return NETDEV_TX_OK; /* handle freeing of skb here */
|
|
}
|
|
|
|
|
|
/**
|
|
* Sets MTU of an interface.
|
|
*
|
|
* dev Pointer to interface struct.
|
|
* new_mtu The new MTU to use for this interface.
|
|
*
|
|
* returns 0 on success, -EINVAL if MTU is out of valid range.
|
|
* (valid range is 576 .. 65527). If VM is on the
|
|
* remote side, maximum MTU is 32760, however this is
|
|
* not checked here.
|
|
*/
|
|
static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
struct ctcm_priv *priv;
|
|
int max_bufsize;
|
|
|
|
if (new_mtu < 576 || new_mtu > 65527)
|
|
return -EINVAL;
|
|
|
|
priv = dev->ml_priv;
|
|
max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
|
|
|
|
if (IS_MPC(priv)) {
|
|
if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
|
|
return -EINVAL;
|
|
dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
|
|
} else {
|
|
if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
|
|
return -EINVAL;
|
|
dev->hard_header_len = LL_HEADER_LENGTH + 2;
|
|
}
|
|
dev->mtu = new_mtu;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Returns interface statistics of a device.
|
|
*
|
|
* dev Pointer to interface struct.
|
|
*
|
|
* returns Pointer to stats struct of this interface.
|
|
*/
|
|
static struct net_device_stats *ctcm_stats(struct net_device *dev)
|
|
{
|
|
return &((struct ctcm_priv *)dev->ml_priv)->stats;
|
|
}
|
|
|
|
static void ctcm_free_netdevice(struct net_device *dev)
|
|
{
|
|
struct ctcm_priv *priv;
|
|
struct mpc_group *grp;
|
|
|
|
CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
|
|
"%s(%s)", CTCM_FUNTAIL, dev->name);
|
|
priv = dev->ml_priv;
|
|
if (priv) {
|
|
grp = priv->mpcg;
|
|
if (grp) {
|
|
if (grp->fsm)
|
|
kfree_fsm(grp->fsm);
|
|
if (grp->xid_skb)
|
|
dev_kfree_skb(grp->xid_skb);
|
|
if (grp->rcvd_xid_skb)
|
|
dev_kfree_skb(grp->rcvd_xid_skb);
|
|
tasklet_kill(&grp->mpc_tasklet2);
|
|
kfree(grp);
|
|
priv->mpcg = NULL;
|
|
}
|
|
if (priv->fsm) {
|
|
kfree_fsm(priv->fsm);
|
|
priv->fsm = NULL;
|
|
}
|
|
kfree(priv->xid);
|
|
priv->xid = NULL;
|
|
/*
|
|
* Note: kfree(priv); is done in "opposite" function of
|
|
* allocator function probe_device which is remove_device.
|
|
*/
|
|
}
|
|
#ifdef MODULE
|
|
free_netdev(dev);
|
|
#endif
|
|
}
|
|
|
|
struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
|
|
|
|
static const struct net_device_ops ctcm_netdev_ops = {
|
|
.ndo_open = ctcm_open,
|
|
.ndo_stop = ctcm_close,
|
|
.ndo_get_stats = ctcm_stats,
|
|
.ndo_change_mtu = ctcm_change_mtu,
|
|
.ndo_start_xmit = ctcm_tx,
|
|
};
|
|
|
|
static const struct net_device_ops ctcm_mpc_netdev_ops = {
|
|
.ndo_open = ctcm_open,
|
|
.ndo_stop = ctcm_close,
|
|
.ndo_get_stats = ctcm_stats,
|
|
.ndo_change_mtu = ctcm_change_mtu,
|
|
.ndo_start_xmit = ctcmpc_tx,
|
|
};
|
|
|
|
void static ctcm_dev_setup(struct net_device *dev)
|
|
{
|
|
dev->type = ARPHRD_SLIP;
|
|
dev->tx_queue_len = 100;
|
|
dev->flags = IFF_POINTOPOINT | IFF_NOARP;
|
|
}
|
|
|
|
/*
|
|
* Initialize everything of the net device except the name and the
|
|
* channel structs.
|
|
*/
|
|
static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
|
|
{
|
|
struct net_device *dev;
|
|
struct mpc_group *grp;
|
|
if (!priv)
|
|
return NULL;
|
|
|
|
if (IS_MPC(priv))
|
|
dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN,
|
|
ctcm_dev_setup);
|
|
else
|
|
dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
|
|
ctcm_dev_setup);
|
|
|
|
if (!dev) {
|
|
CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
|
|
"%s: MEMORY allocation ERROR",
|
|
CTCM_FUNTAIL);
|
|
return NULL;
|
|
}
|
|
dev->ml_priv = priv;
|
|
priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
|
|
CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
|
|
dev_fsm, dev_fsm_len, GFP_KERNEL);
|
|
if (priv->fsm == NULL) {
|
|
CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
|
|
free_netdev(dev);
|
|
return NULL;
|
|
}
|
|
fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
|
|
fsm_settimer(priv->fsm, &priv->restart_timer);
|
|
|
|
if (IS_MPC(priv)) {
|
|
/* MPC Group Initializations */
|
|
grp = ctcmpc_init_mpc_group(priv);
|
|
if (grp == NULL) {
|
|
MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
|
|
free_netdev(dev);
|
|
return NULL;
|
|
}
|
|
tasklet_init(&grp->mpc_tasklet2,
|
|
mpc_group_ready, (unsigned long)dev);
|
|
dev->mtu = MPC_BUFSIZE_DEFAULT -
|
|
TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
|
|
|
|
dev->netdev_ops = &ctcm_mpc_netdev_ops;
|
|
dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
|
|
priv->buffer_size = MPC_BUFSIZE_DEFAULT;
|
|
} else {
|
|
dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
|
|
dev->netdev_ops = &ctcm_netdev_ops;
|
|
dev->hard_header_len = LL_HEADER_LENGTH + 2;
|
|
}
|
|
|
|
CTCMY_DBF_DEV(SETUP, dev, "finished");
|
|
|
|
return dev;
|
|
}
|
|
|
|
/**
|
|
* Main IRQ handler.
|
|
*
|
|
* cdev The ccw_device the interrupt is for.
|
|
* intparm interruption parameter.
|
|
* irb interruption response block.
|
|
*/
|
|
static void ctcm_irq_handler(struct ccw_device *cdev,
|
|
unsigned long intparm, struct irb *irb)
|
|
{
|
|
struct channel *ch;
|
|
struct net_device *dev;
|
|
struct ctcm_priv *priv;
|
|
struct ccwgroup_device *cgdev;
|
|
int cstat;
|
|
int dstat;
|
|
|
|
CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
|
|
"Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
|
|
|
|
if (ctcm_check_irb_error(cdev, irb))
|
|
return;
|
|
|
|
cgdev = dev_get_drvdata(&cdev->dev);
|
|
|
|
cstat = irb->scsw.cmd.cstat;
|
|
dstat = irb->scsw.cmd.dstat;
|
|
|
|
/* Check for unsolicited interrupts. */
|
|
if (cgdev == NULL) {
|
|
CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
|
|
"%s(%s) unsolicited irq: c-%02x d-%02x\n",
|
|
CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
|
|
dev_warn(&cdev->dev,
|
|
"The adapter received a non-specific IRQ\n");
|
|
return;
|
|
}
|
|
|
|
priv = dev_get_drvdata(&cgdev->dev);
|
|
|
|
/* Try to extract channel from driver data. */
|
|
if (priv->channel[CTCM_READ]->cdev == cdev)
|
|
ch = priv->channel[CTCM_READ];
|
|
else if (priv->channel[CTCM_WRITE]->cdev == cdev)
|
|
ch = priv->channel[CTCM_WRITE];
|
|
else {
|
|
dev_err(&cdev->dev,
|
|
"%s: Internal error: Can't determine channel for "
|
|
"interrupt device %s\n",
|
|
__func__, dev_name(&cdev->dev));
|
|
/* Explain: inconsistent internal structures */
|
|
return;
|
|
}
|
|
|
|
dev = ch->netdev;
|
|
if (dev == NULL) {
|
|
dev_err(&cdev->dev,
|
|
"%s Internal error: net_device is NULL, ch = 0x%p\n",
|
|
__func__, ch);
|
|
/* Explain: inconsistent internal structures */
|
|
return;
|
|
}
|
|
|
|
/* Copy interruption response block. */
|
|
memcpy(ch->irb, irb, sizeof(struct irb));
|
|
|
|
/* Issue error message and return on subchannel error code */
|
|
if (irb->scsw.cmd.cstat) {
|
|
fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
|
|
CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
|
|
"%s(%s): sub-ch check %s: cs=%02x ds=%02x",
|
|
CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
|
|
dev_warn(&cdev->dev,
|
|
"A check occurred on the subchannel\n");
|
|
return;
|
|
}
|
|
|
|
/* Check the reason-code of a unit check */
|
|
if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
|
|
if ((irb->ecw[0] & ch->sense_rc) == 0)
|
|
/* print it only once */
|
|
CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
|
|
"%s(%s): sense=%02x, ds=%02x",
|
|
CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
|
|
ccw_unit_check(ch, irb->ecw[0]);
|
|
return;
|
|
}
|
|
if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
|
|
if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
|
|
fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
|
|
else
|
|
fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
|
|
return;
|
|
}
|
|
if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
|
|
fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
|
|
return;
|
|
}
|
|
if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
|
|
(irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
|
|
(irb->scsw.cmd.stctl ==
|
|
(SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
|
|
fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
|
|
else
|
|
fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
|
|
|
|
}
|
|
|
|
static const struct device_type ctcm_devtype = {
|
|
.name = "ctcm",
|
|
.groups = ctcm_attr_groups,
|
|
};
|
|
|
|
/**
|
|
* Add ctcm specific attributes.
|
|
* Add ctcm private data.
|
|
*
|
|
* cgdev pointer to ccwgroup_device just added
|
|
*
|
|
* returns 0 on success, !0 on failure.
|
|
*/
|
|
static int ctcm_probe_device(struct ccwgroup_device *cgdev)
|
|
{
|
|
struct ctcm_priv *priv;
|
|
|
|
CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
|
|
"%s %p",
|
|
__func__, cgdev);
|
|
|
|
if (!get_device(&cgdev->dev))
|
|
return -ENODEV;
|
|
|
|
priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
|
|
if (!priv) {
|
|
CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
|
|
"%s: memory allocation failure",
|
|
CTCM_FUNTAIL);
|
|
put_device(&cgdev->dev);
|
|
return -ENOMEM;
|
|
}
|
|
priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
|
|
cgdev->cdev[0]->handler = ctcm_irq_handler;
|
|
cgdev->cdev[1]->handler = ctcm_irq_handler;
|
|
dev_set_drvdata(&cgdev->dev, priv);
|
|
cgdev->dev.type = &ctcm_devtype;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Add a new channel to the list of channels.
|
|
* Keeps the channel list sorted.
|
|
*
|
|
* cdev The ccw_device to be added.
|
|
* type The type class of the new channel.
|
|
* priv Points to the private data of the ccwgroup_device.
|
|
*
|
|
* returns 0 on success, !0 on error.
|
|
*/
|
|
static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
|
|
struct ctcm_priv *priv)
|
|
{
|
|
struct channel **c = &channels;
|
|
struct channel *ch;
|
|
int ccw_num;
|
|
int rc = 0;
|
|
|
|
CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
|
|
"%s(%s), type %d, proto %d",
|
|
__func__, dev_name(&cdev->dev), type, priv->protocol);
|
|
|
|
ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
|
|
if (ch == NULL)
|
|
return -ENOMEM;
|
|
|
|
ch->protocol = priv->protocol;
|
|
if (IS_MPC(priv)) {
|
|
ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
|
|
if (ch->discontact_th == NULL)
|
|
goto nomem_return;
|
|
|
|
ch->discontact_th->th_blk_flag = TH_DISCONTACT;
|
|
tasklet_init(&ch->ch_disc_tasklet,
|
|
mpc_action_send_discontact, (unsigned long)ch);
|
|
|
|
tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
|
|
ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
|
|
ccw_num = 17;
|
|
} else
|
|
ccw_num = 8;
|
|
|
|
ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
|
|
if (ch->ccw == NULL)
|
|
goto nomem_return;
|
|
|
|
ch->cdev = cdev;
|
|
snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
|
|
ch->type = type;
|
|
|
|
/**
|
|
* "static" ccws are used in the following way:
|
|
*
|
|
* ccw[0..2] (Channel program for generic I/O):
|
|
* 0: prepare
|
|
* 1: read or write (depending on direction) with fixed
|
|
* buffer (idal allocated once when buffer is allocated)
|
|
* 2: nop
|
|
* ccw[3..5] (Channel program for direct write of packets)
|
|
* 3: prepare
|
|
* 4: write (idal allocated on every write).
|
|
* 5: nop
|
|
* ccw[6..7] (Channel program for initial channel setup):
|
|
* 6: set extended mode
|
|
* 7: nop
|
|
*
|
|
* ch->ccw[0..5] are initialized in ch_action_start because
|
|
* the channel's direction is yet unknown here.
|
|
*
|
|
* ccws used for xid2 negotiations
|
|
* ch-ccw[8-14] need to be used for the XID exchange either
|
|
* X side XID2 Processing
|
|
* 8: write control
|
|
* 9: write th
|
|
* 10: write XID
|
|
* 11: read th from secondary
|
|
* 12: read XID from secondary
|
|
* 13: read 4 byte ID
|
|
* 14: nop
|
|
* Y side XID Processing
|
|
* 8: sense
|
|
* 9: read th
|
|
* 10: read XID
|
|
* 11: write th
|
|
* 12: write XID
|
|
* 13: write 4 byte ID
|
|
* 14: nop
|
|
*
|
|
* ccws used for double noop due to VM timing issues
|
|
* which result in unrecoverable Busy on channel
|
|
* 15: nop
|
|
* 16: nop
|
|
*/
|
|
ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
|
|
ch->ccw[6].flags = CCW_FLAG_SLI;
|
|
|
|
ch->ccw[7].cmd_code = CCW_CMD_NOOP;
|
|
ch->ccw[7].flags = CCW_FLAG_SLI;
|
|
|
|
if (IS_MPC(priv)) {
|
|
ch->ccw[15].cmd_code = CCW_CMD_WRITE;
|
|
ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
|
|
ch->ccw[15].count = TH_HEADER_LENGTH;
|
|
ch->ccw[15].cda = virt_to_phys(ch->discontact_th);
|
|
|
|
ch->ccw[16].cmd_code = CCW_CMD_NOOP;
|
|
ch->ccw[16].flags = CCW_FLAG_SLI;
|
|
|
|
ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
|
|
ctc_ch_event_names, CTC_MPC_NR_STATES,
|
|
CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
|
|
mpc_ch_fsm_len, GFP_KERNEL);
|
|
} else {
|
|
ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
|
|
ctc_ch_event_names, CTC_NR_STATES,
|
|
CTC_NR_EVENTS, ch_fsm,
|
|
ch_fsm_len, GFP_KERNEL);
|
|
}
|
|
if (ch->fsm == NULL)
|
|
goto nomem_return;
|
|
|
|
fsm_newstate(ch->fsm, CTC_STATE_IDLE);
|
|
|
|
ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
|
|
if (ch->irb == NULL)
|
|
goto nomem_return;
|
|
|
|
while (*c && ctcm_less_than((*c)->id, ch->id))
|
|
c = &(*c)->next;
|
|
|
|
if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
|
|
CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
|
|
"%s (%s) already in list, using old entry",
|
|
__func__, (*c)->id);
|
|
|
|
goto free_return;
|
|
}
|
|
|
|
spin_lock_init(&ch->collect_lock);
|
|
|
|
fsm_settimer(ch->fsm, &ch->timer);
|
|
skb_queue_head_init(&ch->io_queue);
|
|
skb_queue_head_init(&ch->collect_queue);
|
|
|
|
if (IS_MPC(priv)) {
|
|
fsm_settimer(ch->fsm, &ch->sweep_timer);
|
|
skb_queue_head_init(&ch->sweep_queue);
|
|
}
|
|
ch->next = *c;
|
|
*c = ch;
|
|
return 0;
|
|
|
|
nomem_return:
|
|
rc = -ENOMEM;
|
|
|
|
free_return: /* note that all channel pointers are 0 or valid */
|
|
kfree(ch->ccw);
|
|
kfree(ch->discontact_th);
|
|
kfree_fsm(ch->fsm);
|
|
kfree(ch->irb);
|
|
kfree(ch);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Return type of a detected device.
|
|
*/
|
|
static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
|
|
{
|
|
enum ctcm_channel_types type;
|
|
type = (enum ctcm_channel_types)id->driver_info;
|
|
|
|
if (type == ctcm_channel_type_ficon)
|
|
type = ctcm_channel_type_escon;
|
|
|
|
return type;
|
|
}
|
|
|
|
/**
|
|
*
|
|
* Setup an interface.
|
|
*
|
|
* cgdev Device to be setup.
|
|
*
|
|
* returns 0 on success, !0 on failure.
|
|
*/
|
|
static int ctcm_new_device(struct ccwgroup_device *cgdev)
|
|
{
|
|
char read_id[CTCM_ID_SIZE];
|
|
char write_id[CTCM_ID_SIZE];
|
|
int direction;
|
|
enum ctcm_channel_types type;
|
|
struct ctcm_priv *priv;
|
|
struct net_device *dev;
|
|
struct ccw_device *cdev0;
|
|
struct ccw_device *cdev1;
|
|
struct channel *readc;
|
|
struct channel *writec;
|
|
int ret;
|
|
int result;
|
|
|
|
priv = dev_get_drvdata(&cgdev->dev);
|
|
if (!priv) {
|
|
result = -ENODEV;
|
|
goto out_err_result;
|
|
}
|
|
|
|
cdev0 = cgdev->cdev[0];
|
|
cdev1 = cgdev->cdev[1];
|
|
|
|
type = get_channel_type(&cdev0->id);
|
|
|
|
snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
|
|
snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
|
|
|
|
ret = add_channel(cdev0, type, priv);
|
|
if (ret) {
|
|
result = ret;
|
|
goto out_err_result;
|
|
}
|
|
ret = add_channel(cdev1, type, priv);
|
|
if (ret) {
|
|
result = ret;
|
|
goto out_remove_channel1;
|
|
}
|
|
|
|
ret = ccw_device_set_online(cdev0);
|
|
if (ret != 0) {
|
|
CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
|
|
"%s(%s) set_online rc=%d",
|
|
CTCM_FUNTAIL, read_id, ret);
|
|
result = -EIO;
|
|
goto out_remove_channel2;
|
|
}
|
|
|
|
ret = ccw_device_set_online(cdev1);
|
|
if (ret != 0) {
|
|
CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
|
|
"%s(%s) set_online rc=%d",
|
|
CTCM_FUNTAIL, write_id, ret);
|
|
|
|
result = -EIO;
|
|
goto out_ccw1;
|
|
}
|
|
|
|
dev = ctcm_init_netdevice(priv);
|
|
if (dev == NULL) {
|
|
result = -ENODEV;
|
|
goto out_ccw2;
|
|
}
|
|
|
|
for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
|
|
priv->channel[direction] =
|
|
channel_get(type, direction == CTCM_READ ?
|
|
read_id : write_id, direction);
|
|
if (priv->channel[direction] == NULL) {
|
|
if (direction == CTCM_WRITE)
|
|
channel_free(priv->channel[CTCM_READ]);
|
|
goto out_dev;
|
|
}
|
|
priv->channel[direction]->netdev = dev;
|
|
priv->channel[direction]->protocol = priv->protocol;
|
|
priv->channel[direction]->max_bufsize = priv->buffer_size;
|
|
}
|
|
/* sysfs magic */
|
|
SET_NETDEV_DEV(dev, &cgdev->dev);
|
|
|
|
if (register_netdev(dev)) {
|
|
result = -ENODEV;
|
|
goto out_dev;
|
|
}
|
|
|
|
strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
|
|
|
|
dev_info(&dev->dev,
|
|
"setup OK : r/w = %s/%s, protocol : %d\n",
|
|
priv->channel[CTCM_READ]->id,
|
|
priv->channel[CTCM_WRITE]->id, priv->protocol);
|
|
|
|
CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
|
|
"setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
|
|
priv->channel[CTCM_READ]->id,
|
|
priv->channel[CTCM_WRITE]->id, priv->protocol);
|
|
|
|
return 0;
|
|
out_dev:
|
|
ctcm_free_netdevice(dev);
|
|
out_ccw2:
|
|
ccw_device_set_offline(cgdev->cdev[1]);
|
|
out_ccw1:
|
|
ccw_device_set_offline(cgdev->cdev[0]);
|
|
out_remove_channel2:
|
|
readc = channel_get(type, read_id, CTCM_READ);
|
|
channel_remove(readc);
|
|
out_remove_channel1:
|
|
writec = channel_get(type, write_id, CTCM_WRITE);
|
|
channel_remove(writec);
|
|
out_err_result:
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Shutdown an interface.
|
|
*
|
|
* cgdev Device to be shut down.
|
|
*
|
|
* returns 0 on success, !0 on failure.
|
|
*/
|
|
static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
|
|
{
|
|
struct ctcm_priv *priv;
|
|
struct net_device *dev;
|
|
|
|
priv = dev_get_drvdata(&cgdev->dev);
|
|
if (!priv)
|
|
return -ENODEV;
|
|
|
|
if (priv->channel[CTCM_READ]) {
|
|
dev = priv->channel[CTCM_READ]->netdev;
|
|
CTCM_DBF_DEV(SETUP, dev, "");
|
|
/* Close the device */
|
|
ctcm_close(dev);
|
|
dev->flags &= ~IFF_RUNNING;
|
|
channel_free(priv->channel[CTCM_READ]);
|
|
} else
|
|
dev = NULL;
|
|
|
|
if (priv->channel[CTCM_WRITE])
|
|
channel_free(priv->channel[CTCM_WRITE]);
|
|
|
|
if (dev) {
|
|
unregister_netdev(dev);
|
|
ctcm_free_netdevice(dev);
|
|
}
|
|
|
|
if (priv->fsm)
|
|
kfree_fsm(priv->fsm);
|
|
|
|
ccw_device_set_offline(cgdev->cdev[1]);
|
|
ccw_device_set_offline(cgdev->cdev[0]);
|
|
channel_remove(priv->channel[CTCM_READ]);
|
|
channel_remove(priv->channel[CTCM_WRITE]);
|
|
priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
static void ctcm_remove_device(struct ccwgroup_device *cgdev)
|
|
{
|
|
struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
|
|
|
|
CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
|
|
"removing device %p, proto : %d",
|
|
cgdev, priv->protocol);
|
|
|
|
if (cgdev->state == CCWGROUP_ONLINE)
|
|
ctcm_shutdown_device(cgdev);
|
|
dev_set_drvdata(&cgdev->dev, NULL);
|
|
kfree(priv);
|
|
put_device(&cgdev->dev);
|
|
}
|
|
|
|
static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
|
|
{
|
|
struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
|
|
|
|
if (gdev->state == CCWGROUP_OFFLINE)
|
|
return 0;
|
|
netif_device_detach(priv->channel[CTCM_READ]->netdev);
|
|
ctcm_close(priv->channel[CTCM_READ]->netdev);
|
|
if (!wait_event_timeout(priv->fsm->wait_q,
|
|
fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
|
|
netif_device_attach(priv->channel[CTCM_READ]->netdev);
|
|
return -EBUSY;
|
|
}
|
|
ccw_device_set_offline(gdev->cdev[1]);
|
|
ccw_device_set_offline(gdev->cdev[0]);
|
|
return 0;
|
|
}
|
|
|
|
static int ctcm_pm_resume(struct ccwgroup_device *gdev)
|
|
{
|
|
struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
|
|
int rc;
|
|
|
|
if (gdev->state == CCWGROUP_OFFLINE)
|
|
return 0;
|
|
rc = ccw_device_set_online(gdev->cdev[1]);
|
|
if (rc)
|
|
goto err_out;
|
|
rc = ccw_device_set_online(gdev->cdev[0]);
|
|
if (rc)
|
|
goto err_out;
|
|
ctcm_open(priv->channel[CTCM_READ]->netdev);
|
|
err_out:
|
|
netif_device_attach(priv->channel[CTCM_READ]->netdev);
|
|
return rc;
|
|
}
|
|
|
|
static struct ccw_device_id ctcm_ids[] = {
|
|
{CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
|
|
{CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
|
|
{CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(ccw, ctcm_ids);
|
|
|
|
static struct ccw_driver ctcm_ccw_driver = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ctcm",
|
|
},
|
|
.ids = ctcm_ids,
|
|
.probe = ccwgroup_probe_ccwdev,
|
|
.remove = ccwgroup_remove_ccwdev,
|
|
.int_class = IRQIO_CTC,
|
|
};
|
|
|
|
static struct ccwgroup_driver ctcm_group_driver = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = CTC_DRIVER_NAME,
|
|
},
|
|
.setup = ctcm_probe_device,
|
|
.remove = ctcm_remove_device,
|
|
.set_online = ctcm_new_device,
|
|
.set_offline = ctcm_shutdown_device,
|
|
.freeze = ctcm_pm_suspend,
|
|
.thaw = ctcm_pm_resume,
|
|
.restore = ctcm_pm_resume,
|
|
};
|
|
|
|
static ssize_t ctcm_driver_group_store(struct device_driver *ddrv,
|
|
const char *buf, size_t count)
|
|
{
|
|
int err;
|
|
|
|
err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
|
|
return err ? err : count;
|
|
}
|
|
static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
|
|
|
|
static struct attribute *ctcm_drv_attrs[] = {
|
|
&driver_attr_group.attr,
|
|
NULL,
|
|
};
|
|
static struct attribute_group ctcm_drv_attr_group = {
|
|
.attrs = ctcm_drv_attrs,
|
|
};
|
|
static const struct attribute_group *ctcm_drv_attr_groups[] = {
|
|
&ctcm_drv_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
/*
|
|
* Module related routines
|
|
*/
|
|
|
|
/*
|
|
* Prepare to be unloaded. Free IRQ's and release all resources.
|
|
* This is called just before this module is unloaded. It is
|
|
* not called, if the usage count is !0, so we don't need to check
|
|
* for that.
|
|
*/
|
|
static void __exit ctcm_exit(void)
|
|
{
|
|
ccwgroup_driver_unregister(&ctcm_group_driver);
|
|
ccw_driver_unregister(&ctcm_ccw_driver);
|
|
root_device_unregister(ctcm_root_dev);
|
|
ctcm_unregister_dbf_views();
|
|
pr_info("CTCM driver unloaded\n");
|
|
}
|
|
|
|
/*
|
|
* Print Banner.
|
|
*/
|
|
static void print_banner(void)
|
|
{
|
|
pr_info("CTCM driver initialized\n");
|
|
}
|
|
|
|
/**
|
|
* Initialize module.
|
|
* This is called just after the module is loaded.
|
|
*
|
|
* returns 0 on success, !0 on error.
|
|
*/
|
|
static int __init ctcm_init(void)
|
|
{
|
|
int ret;
|
|
|
|
channels = NULL;
|
|
|
|
ret = ctcm_register_dbf_views();
|
|
if (ret)
|
|
goto out_err;
|
|
ctcm_root_dev = root_device_register("ctcm");
|
|
ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
|
|
if (ret)
|
|
goto register_err;
|
|
ret = ccw_driver_register(&ctcm_ccw_driver);
|
|
if (ret)
|
|
goto ccw_err;
|
|
ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
|
|
ret = ccwgroup_driver_register(&ctcm_group_driver);
|
|
if (ret)
|
|
goto ccwgroup_err;
|
|
print_banner();
|
|
return 0;
|
|
|
|
ccwgroup_err:
|
|
ccw_driver_unregister(&ctcm_ccw_driver);
|
|
ccw_err:
|
|
root_device_unregister(ctcm_root_dev);
|
|
register_err:
|
|
ctcm_unregister_dbf_views();
|
|
out_err:
|
|
pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
|
|
__func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
module_init(ctcm_init);
|
|
module_exit(ctcm_exit);
|
|
|
|
MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
|
|
MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
|
|
MODULE_LICENSE("GPL");
|
|
|