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net.c
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net.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* IPv4 over IEEE 1394, per RFC 2734
* IPv6 over IEEE 1394, per RFC 3146
*
* Copyright (C) 2009 Jay Fenlason <[email protected]>
*
* based on eth1394 by Ben Collins et al
*/
#include <linux/bug.h>
#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/ethtool.h>
#include <linux/firewire.h>
#include <linux/firewire-constants.h>
#include <linux/highmem.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/jiffies.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <asm/unaligned.h>
#include <net/arp.h>
#include <net/firewire.h>
/* rx limits */
#define FWNET_MAX_FRAGMENTS 30 /* arbitrary, > TX queue depth */
#define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16*1024 ? 4 : 2)
/* tx limits */
#define FWNET_MAX_QUEUED_DATAGRAMS 20 /* < 64 = number of tlabels */
#define FWNET_MIN_QUEUED_DATAGRAMS 10 /* should keep AT DMA busy enough */
#define FWNET_TX_QUEUE_LEN FWNET_MAX_QUEUED_DATAGRAMS /* ? */
#define IEEE1394_BROADCAST_CHANNEL 31
#define IEEE1394_ALL_NODES (0xffc0 | 0x003f)
#define IEEE1394_MAX_PAYLOAD_S100 512
#define FWNET_NO_FIFO_ADDR (~0ULL)
#define IANA_SPECIFIER_ID 0x00005eU
#define RFC2734_SW_VERSION 0x000001U
#define RFC3146_SW_VERSION 0x000002U
#define IEEE1394_GASP_HDR_SIZE 8
#define RFC2374_UNFRAG_HDR_SIZE 4
#define RFC2374_FRAG_HDR_SIZE 8
#define RFC2374_FRAG_OVERHEAD 4
#define RFC2374_HDR_UNFRAG 0 /* unfragmented */
#define RFC2374_HDR_FIRSTFRAG 1 /* first fragment */
#define RFC2374_HDR_LASTFRAG 2 /* last fragment */
#define RFC2374_HDR_INTFRAG 3 /* interior fragment */
static bool fwnet_hwaddr_is_multicast(u8 *ha)
{
return !!(*ha & 1);
}
/* IPv4 and IPv6 encapsulation header */
struct rfc2734_header {
u32 w0;
u32 w1;
};
#define fwnet_get_hdr_lf(h) (((h)->w0 & 0xc0000000) >> 30)
#define fwnet_get_hdr_ether_type(h) (((h)->w0 & 0x0000ffff))
#define fwnet_get_hdr_dg_size(h) ((((h)->w0 & 0x0fff0000) >> 16) + 1)
#define fwnet_get_hdr_fg_off(h) (((h)->w0 & 0x00000fff))
#define fwnet_get_hdr_dgl(h) (((h)->w1 & 0xffff0000) >> 16)
#define fwnet_set_hdr_lf(lf) ((lf) << 30)
#define fwnet_set_hdr_ether_type(et) (et)
#define fwnet_set_hdr_dg_size(dgs) (((dgs) - 1) << 16)
#define fwnet_set_hdr_fg_off(fgo) (fgo)
#define fwnet_set_hdr_dgl(dgl) ((dgl) << 16)
static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
unsigned ether_type)
{
hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
| fwnet_set_hdr_ether_type(ether_type);
}
static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
unsigned ether_type, unsigned dg_size, unsigned dgl)
{
hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
| fwnet_set_hdr_dg_size(dg_size)
| fwnet_set_hdr_ether_type(ether_type);
hdr->w1 = fwnet_set_hdr_dgl(dgl);
}
static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
{
hdr->w0 = fwnet_set_hdr_lf(lf)
| fwnet_set_hdr_dg_size(dg_size)
| fwnet_set_hdr_fg_off(fg_off);
hdr->w1 = fwnet_set_hdr_dgl(dgl);
}
/* This list keeps track of what parts of the datagram have been filled in */
struct fwnet_fragment_info {
struct list_head fi_link;
u16 offset;
u16 len;
};
struct fwnet_partial_datagram {
struct list_head pd_link;
struct list_head fi_list;
struct sk_buff *skb;
/* FIXME Why not use skb->data? */
char *pbuf;
u16 datagram_label;
u16 ether_type;
u16 datagram_size;
};
static DEFINE_MUTEX(fwnet_device_mutex);
static LIST_HEAD(fwnet_device_list);
struct fwnet_device {
struct list_head dev_link;
spinlock_t lock;
enum {
FWNET_BROADCAST_ERROR,
FWNET_BROADCAST_RUNNING,
FWNET_BROADCAST_STOPPED,
} broadcast_state;
struct fw_iso_context *broadcast_rcv_context;
struct fw_iso_buffer broadcast_rcv_buffer;
void **broadcast_rcv_buffer_ptrs;
unsigned broadcast_rcv_next_ptr;
unsigned num_broadcast_rcv_ptrs;
unsigned rcv_buffer_size;
/*
* This value is the maximum unfragmented datagram size that can be
* sent by the hardware. It already has the GASP overhead and the
* unfragmented datagram header overhead calculated into it.
*/
unsigned broadcast_xmt_max_payload;
u16 broadcast_xmt_datagramlabel;
/*
* The CSR address that remote nodes must send datagrams to for us to
* receive them.
*/
struct fw_address_handler handler;
u64 local_fifo;
/* Number of tx datagrams that have been queued but not yet acked */
int queued_datagrams;
int peer_count;
struct list_head peer_list;
struct fw_card *card;
struct net_device *netdev;
};
struct fwnet_peer {
struct list_head peer_link;
struct fwnet_device *dev;
u64 guid;
/* guarded by dev->lock */
struct list_head pd_list; /* received partial datagrams */
unsigned pdg_size; /* pd_list size */
u16 datagram_label; /* outgoing datagram label */
u16 max_payload; /* includes RFC2374_FRAG_HDR_SIZE overhead */
int node_id;
int generation;
unsigned speed;
};
/* This is our task struct. It's used for the packet complete callback. */
struct fwnet_packet_task {
struct fw_transaction transaction;
struct rfc2734_header hdr;
struct sk_buff *skb;
struct fwnet_device *dev;
int outstanding_pkts;
u64 fifo_addr;
u16 dest_node;
u16 max_payload;
u8 generation;
u8 speed;
u8 enqueued;
};
/*
* saddr == NULL means use device source address.
* daddr == NULL means leave destination address (eg unresolved arp).
*/
static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
unsigned short type, const void *daddr,
const void *saddr, unsigned len)
{
struct fwnet_header *h;
h = skb_push(skb, sizeof(*h));
put_unaligned_be16(type, &h->h_proto);
if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
memset(h->h_dest, 0, net->addr_len);
return net->hard_header_len;
}
if (daddr) {
memcpy(h->h_dest, daddr, net->addr_len);
return net->hard_header_len;
}
return -net->hard_header_len;
}
static int fwnet_header_cache(const struct neighbour *neigh,
struct hh_cache *hh, __be16 type)
{
struct net_device *net;
struct fwnet_header *h;
if (type == cpu_to_be16(ETH_P_802_3))
return -1;
net = neigh->dev;
h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
h->h_proto = type;
memcpy(h->h_dest, neigh->ha, net->addr_len);
/* Pairs with the READ_ONCE() in neigh_resolve_output(),
* neigh_hh_output() and neigh_update_hhs().
*/
smp_store_release(&hh->hh_len, FWNET_HLEN);
return 0;
}
/* Called by Address Resolution module to notify changes in address. */
static void fwnet_header_cache_update(struct hh_cache *hh,
const struct net_device *net, const unsigned char *haddr)
{
memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
}
static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
{
memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
return FWNET_ALEN;
}
static const struct header_ops fwnet_header_ops = {
.create = fwnet_header_create,
.cache = fwnet_header_cache,
.cache_update = fwnet_header_cache_update,
.parse = fwnet_header_parse,
};
/* FIXME: is this correct for all cases? */
static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
unsigned offset, unsigned len)
{
struct fwnet_fragment_info *fi;
unsigned end = offset + len;
list_for_each_entry(fi, &pd->fi_list, fi_link)
if (offset < fi->offset + fi->len && end > fi->offset)
return true;
return false;
}
/* Assumes that new fragment does not overlap any existing fragments */
static struct fwnet_fragment_info *fwnet_frag_new(
struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
{
struct fwnet_fragment_info *fi, *fi2, *new;
struct list_head *list;
list = &pd->fi_list;
list_for_each_entry(fi, &pd->fi_list, fi_link) {
if (fi->offset + fi->len == offset) {
/* The new fragment can be tacked on to the end */
/* Did the new fragment plug a hole? */
fi2 = list_entry(fi->fi_link.next,
struct fwnet_fragment_info, fi_link);
if (fi->offset + fi->len == fi2->offset) {
/* glue fragments together */
fi->len += len + fi2->len;
list_del(&fi2->fi_link);
kfree(fi2);
} else {
fi->len += len;
}
return fi;
}
if (offset + len == fi->offset) {
/* The new fragment can be tacked on to the beginning */
/* Did the new fragment plug a hole? */
fi2 = list_entry(fi->fi_link.prev,
struct fwnet_fragment_info, fi_link);
if (fi2->offset + fi2->len == fi->offset) {
/* glue fragments together */
fi2->len += fi->len + len;
list_del(&fi->fi_link);
kfree(fi);
return fi2;
}
fi->offset = offset;
fi->len += len;
return fi;
}
if (offset > fi->offset + fi->len) {
list = &fi->fi_link;
break;
}
if (offset + len < fi->offset) {
list = fi->fi_link.prev;
break;
}
}
new = kmalloc(sizeof(*new), GFP_ATOMIC);
if (!new)
return NULL;
new->offset = offset;
new->len = len;
list_add(&new->fi_link, list);
return new;
}
static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
void *frag_buf, unsigned frag_off, unsigned frag_len)
{
struct fwnet_partial_datagram *new;
struct fwnet_fragment_info *fi;
new = kmalloc(sizeof(*new), GFP_ATOMIC);
if (!new)
goto fail;
INIT_LIST_HEAD(&new->fi_list);
fi = fwnet_frag_new(new, frag_off, frag_len);
if (fi == NULL)
goto fail_w_new;
new->datagram_label = datagram_label;
new->datagram_size = dg_size;
new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
if (new->skb == NULL)
goto fail_w_fi;
skb_reserve(new->skb, LL_RESERVED_SPACE(net));
new->pbuf = skb_put(new->skb, dg_size);
memcpy(new->pbuf + frag_off, frag_buf, frag_len);
list_add_tail(&new->pd_link, &peer->pd_list);
return new;
fail_w_fi:
kfree(fi);
fail_w_new:
kfree(new);
fail:
return NULL;
}
static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
u16 datagram_label)
{
struct fwnet_partial_datagram *pd;
list_for_each_entry(pd, &peer->pd_list, pd_link)
if (pd->datagram_label == datagram_label)
return pd;
return NULL;
}
static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
{
struct fwnet_fragment_info *fi, *n;
list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
kfree(fi);
list_del(&old->pd_link);
dev_kfree_skb_any(old->skb);
kfree(old);
}
static bool fwnet_pd_update(struct fwnet_peer *peer,
struct fwnet_partial_datagram *pd, void *frag_buf,
unsigned frag_off, unsigned frag_len)
{
if (fwnet_frag_new(pd, frag_off, frag_len) == NULL)
return false;
memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
/*
* Move list entry to beginning of list so that oldest partial
* datagrams percolate to the end of the list
*/
list_move_tail(&pd->pd_link, &peer->pd_list);
return true;
}
static bool fwnet_pd_is_complete(struct fwnet_partial_datagram *pd)
{
struct fwnet_fragment_info *fi;
fi = list_entry(pd->fi_list.next, struct fwnet_fragment_info, fi_link);
return fi->len == pd->datagram_size;
}
/* caller must hold dev->lock */
static struct fwnet_peer *fwnet_peer_find_by_guid(struct fwnet_device *dev,
u64 guid)
{
struct fwnet_peer *peer;
list_for_each_entry(peer, &dev->peer_list, peer_link)
if (peer->guid == guid)
return peer;
return NULL;
}
/* caller must hold dev->lock */
static struct fwnet_peer *fwnet_peer_find_by_node_id(struct fwnet_device *dev,
int node_id, int generation)
{
struct fwnet_peer *peer;
list_for_each_entry(peer, &dev->peer_list, peer_link)
if (peer->node_id == node_id &&
peer->generation == generation)
return peer;
return NULL;
}
/* See IEEE 1394-2008 table 6-4, table 8-8, table 16-18. */
static unsigned fwnet_max_payload(unsigned max_rec, unsigned speed)
{
max_rec = min(max_rec, speed + 8);
max_rec = clamp(max_rec, 8U, 11U); /* 512...4096 */
return (1 << (max_rec + 1)) - RFC2374_FRAG_HDR_SIZE;
}
static int fwnet_finish_incoming_packet(struct net_device *net,
struct sk_buff *skb, u16 source_node_id,
bool is_broadcast, u16 ether_type)
{
int status, len;
switch (ether_type) {
case ETH_P_ARP:
case ETH_P_IP:
#if IS_ENABLED(CONFIG_IPV6)
case ETH_P_IPV6:
#endif
break;
default:
goto err;
}
/* Write metadata, and then pass to the receive level */
skb->dev = net;
skb->ip_summed = CHECKSUM_NONE;
/*
* Parse the encapsulation header. This actually does the job of
* converting to an ethernet-like pseudo frame header.
*/
if (dev_hard_header(skb, net, ether_type,
is_broadcast ? net->broadcast : net->dev_addr,
NULL, skb->len) >= 0) {
struct fwnet_header *eth;
u16 *rawp;
__be16 protocol;
skb_reset_mac_header(skb);
skb_pull(skb, sizeof(*eth));
eth = (struct fwnet_header *)skb_mac_header(skb);
if (fwnet_hwaddr_is_multicast(eth->h_dest)) {
if (memcmp(eth->h_dest, net->broadcast,
net->addr_len) == 0)
skb->pkt_type = PACKET_BROADCAST;
#if 0
else
skb->pkt_type = PACKET_MULTICAST;
#endif
} else {
if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
skb->pkt_type = PACKET_OTHERHOST;
}
if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) {
protocol = eth->h_proto;
} else {
rawp = (u16 *)skb->data;
if (*rawp == 0xffff)
protocol = htons(ETH_P_802_3);
else
protocol = htons(ETH_P_802_2);
}
skb->protocol = protocol;
}
len = skb->len;
status = netif_rx(skb);
if (status == NET_RX_DROP) {
net->stats.rx_errors++;
net->stats.rx_dropped++;
} else {
net->stats.rx_packets++;
net->stats.rx_bytes += len;
}
return 0;
err:
net->stats.rx_errors++;
net->stats.rx_dropped++;
dev_kfree_skb_any(skb);
return -ENOENT;
}
static int fwnet_incoming_packet(struct fwnet_device *dev, __be32 *buf, int len,
int source_node_id, int generation,
bool is_broadcast)
{
struct sk_buff *skb;
struct net_device *net = dev->netdev;
struct rfc2734_header hdr;
unsigned lf;
unsigned long flags;
struct fwnet_peer *peer;
struct fwnet_partial_datagram *pd;
int fg_off;
int dg_size;
u16 datagram_label;
int retval;
u16 ether_type;
if (len <= RFC2374_UNFRAG_HDR_SIZE)
return 0;
hdr.w0 = be32_to_cpu(buf[0]);
lf = fwnet_get_hdr_lf(&hdr);
if (lf == RFC2374_HDR_UNFRAG) {
/*
* An unfragmented datagram has been received by the ieee1394
* bus. Build an skbuff around it so we can pass it to the
* high level network layer.
*/
ether_type = fwnet_get_hdr_ether_type(&hdr);
buf++;
len -= RFC2374_UNFRAG_HDR_SIZE;
skb = dev_alloc_skb(len + LL_RESERVED_SPACE(net));
if (unlikely(!skb)) {
net->stats.rx_dropped++;
return -ENOMEM;
}
skb_reserve(skb, LL_RESERVED_SPACE(net));
skb_put_data(skb, buf, len);
return fwnet_finish_incoming_packet(net, skb, source_node_id,
is_broadcast, ether_type);
}
/* A datagram fragment has been received, now the fun begins. */
if (len <= RFC2374_FRAG_HDR_SIZE)
return 0;
hdr.w1 = ntohl(buf[1]);
buf += 2;
len -= RFC2374_FRAG_HDR_SIZE;
if (lf == RFC2374_HDR_FIRSTFRAG) {
ether_type = fwnet_get_hdr_ether_type(&hdr);
fg_off = 0;
} else {
ether_type = 0;
fg_off = fwnet_get_hdr_fg_off(&hdr);
}
datagram_label = fwnet_get_hdr_dgl(&hdr);
dg_size = fwnet_get_hdr_dg_size(&hdr);
if (fg_off + len > dg_size)
return 0;
spin_lock_irqsave(&dev->lock, flags);
peer = fwnet_peer_find_by_node_id(dev, source_node_id, generation);
if (!peer) {
retval = -ENOENT;
goto fail;
}
pd = fwnet_pd_find(peer, datagram_label);
if (pd == NULL) {
while (peer->pdg_size >= FWNET_MAX_FRAGMENTS) {
/* remove the oldest */
fwnet_pd_delete(list_first_entry(&peer->pd_list,
struct fwnet_partial_datagram, pd_link));
peer->pdg_size--;
}
pd = fwnet_pd_new(net, peer, datagram_label,
dg_size, buf, fg_off, len);
if (pd == NULL) {
retval = -ENOMEM;
goto fail;
}
peer->pdg_size++;
} else {
if (fwnet_frag_overlap(pd, fg_off, len) ||
pd->datagram_size != dg_size) {
/*
* Differing datagram sizes or overlapping fragments,
* discard old datagram and start a new one.
*/
fwnet_pd_delete(pd);
pd = fwnet_pd_new(net, peer, datagram_label,
dg_size, buf, fg_off, len);
if (pd == NULL) {
peer->pdg_size--;
retval = -ENOMEM;
goto fail;
}
} else {
if (!fwnet_pd_update(peer, pd, buf, fg_off, len)) {
/*
* Couldn't save off fragment anyway
* so might as well obliterate the
* datagram now.
*/
fwnet_pd_delete(pd);
peer->pdg_size--;
retval = -ENOMEM;
goto fail;
}
}
} /* new datagram or add to existing one */
if (lf == RFC2374_HDR_FIRSTFRAG)
pd->ether_type = ether_type;
if (fwnet_pd_is_complete(pd)) {
ether_type = pd->ether_type;
peer->pdg_size--;
skb = skb_get(pd->skb);
fwnet_pd_delete(pd);
spin_unlock_irqrestore(&dev->lock, flags);
return fwnet_finish_incoming_packet(net, skb, source_node_id,
false, ether_type);
}
/*
* Datagram is not complete, we're done for the
* moment.
*/
retval = 0;
fail:
spin_unlock_irqrestore(&dev->lock, flags);
return retval;
}
static void fwnet_receive_packet(struct fw_card *card, struct fw_request *r,
int tcode, int destination, int source, int generation,
unsigned long long offset, void *payload, size_t length,
void *callback_data)
{
struct fwnet_device *dev = callback_data;
int rcode;
if (destination == IEEE1394_ALL_NODES) {
// Although the response to the broadcast packet is not necessarily required, the
// fw_send_response() function should still be called to maintain the reference
// counting of the object. In the case, the call of function just releases the
// object as a result to decrease the reference counting.
rcode = RCODE_COMPLETE;
} else if (offset != dev->handler.offset) {
rcode = RCODE_ADDRESS_ERROR;
} else if (tcode != TCODE_WRITE_BLOCK_REQUEST) {
rcode = RCODE_TYPE_ERROR;
} else if (fwnet_incoming_packet(dev, payload, length,
source, generation, false) != 0) {
dev_err(&dev->netdev->dev, "incoming packet failure\n");
rcode = RCODE_CONFLICT_ERROR;
} else {
rcode = RCODE_COMPLETE;
}
fw_send_response(card, r, rcode);
}
static int gasp_source_id(__be32 *p)
{
return be32_to_cpu(p[0]) >> 16;
}
static u32 gasp_specifier_id(__be32 *p)
{
return (be32_to_cpu(p[0]) & 0xffff) << 8 |
(be32_to_cpu(p[1]) & 0xff000000) >> 24;
}
static u32 gasp_version(__be32 *p)
{
return be32_to_cpu(p[1]) & 0xffffff;
}
static void fwnet_receive_broadcast(struct fw_iso_context *context,
u32 cycle, size_t header_length, void *header, void *data)
{
struct fwnet_device *dev;
struct fw_iso_packet packet;
__be16 *hdr_ptr;
__be32 *buf_ptr;
int retval;
u32 length;
unsigned long offset;
unsigned long flags;
dev = data;
hdr_ptr = header;
length = be16_to_cpup(hdr_ptr);
spin_lock_irqsave(&dev->lock, flags);
offset = dev->rcv_buffer_size * dev->broadcast_rcv_next_ptr;
buf_ptr = dev->broadcast_rcv_buffer_ptrs[dev->broadcast_rcv_next_ptr++];
if (dev->broadcast_rcv_next_ptr == dev->num_broadcast_rcv_ptrs)
dev->broadcast_rcv_next_ptr = 0;
spin_unlock_irqrestore(&dev->lock, flags);
if (length > IEEE1394_GASP_HDR_SIZE &&
gasp_specifier_id(buf_ptr) == IANA_SPECIFIER_ID &&
(gasp_version(buf_ptr) == RFC2734_SW_VERSION
#if IS_ENABLED(CONFIG_IPV6)
|| gasp_version(buf_ptr) == RFC3146_SW_VERSION
#endif
))
fwnet_incoming_packet(dev, buf_ptr + 2,
length - IEEE1394_GASP_HDR_SIZE,
gasp_source_id(buf_ptr),
context->card->generation, true);
packet.payload_length = dev->rcv_buffer_size;
packet.interrupt = 1;
packet.skip = 0;
packet.tag = 3;
packet.sy = 0;
packet.header_length = IEEE1394_GASP_HDR_SIZE;
spin_lock_irqsave(&dev->lock, flags);
retval = fw_iso_context_queue(dev->broadcast_rcv_context, &packet,
&dev->broadcast_rcv_buffer, offset);
spin_unlock_irqrestore(&dev->lock, flags);
if (retval >= 0)
fw_iso_context_queue_flush(dev->broadcast_rcv_context);
else
dev_err(&dev->netdev->dev, "requeue failed\n");
}
static struct kmem_cache *fwnet_packet_task_cache;
static void fwnet_free_ptask(struct fwnet_packet_task *ptask)
{
dev_kfree_skb_any(ptask->skb);
kmem_cache_free(fwnet_packet_task_cache, ptask);
}
/* Caller must hold dev->lock. */
static void dec_queued_datagrams(struct fwnet_device *dev)
{
if (--dev->queued_datagrams == FWNET_MIN_QUEUED_DATAGRAMS)
netif_wake_queue(dev->netdev);
}
static int fwnet_send_packet(struct fwnet_packet_task *ptask);
static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
{
struct fwnet_device *dev = ptask->dev;
struct sk_buff *skb = ptask->skb;
unsigned long flags;
bool free;
spin_lock_irqsave(&dev->lock, flags);
ptask->outstanding_pkts--;
/* Check whether we or the networking TX soft-IRQ is last user. */
free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
if (free)
dec_queued_datagrams(dev);
if (ptask->outstanding_pkts == 0) {
dev->netdev->stats.tx_packets++;
dev->netdev->stats.tx_bytes += skb->len;
}
spin_unlock_irqrestore(&dev->lock, flags);
if (ptask->outstanding_pkts > 0) {
u16 dg_size;
u16 fg_off;
u16 datagram_label;
u16 lf;
/* Update the ptask to point to the next fragment and send it */
lf = fwnet_get_hdr_lf(&ptask->hdr);
switch (lf) {
case RFC2374_HDR_LASTFRAG:
case RFC2374_HDR_UNFRAG:
default:
dev_err(&dev->netdev->dev,
"outstanding packet %x lf %x, header %x,%x\n",
ptask->outstanding_pkts, lf, ptask->hdr.w0,
ptask->hdr.w1);
BUG();
case RFC2374_HDR_FIRSTFRAG:
/* Set frag type here for future interior fragments */
dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
fg_off = ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
break;
case RFC2374_HDR_INTFRAG:
dg_size = fwnet_get_hdr_dg_size(&ptask->hdr);
fg_off = fwnet_get_hdr_fg_off(&ptask->hdr)
+ ptask->max_payload - RFC2374_FRAG_HDR_SIZE;
datagram_label = fwnet_get_hdr_dgl(&ptask->hdr);
break;
}
if (ptask->dest_node == IEEE1394_ALL_NODES) {
skb_pull(skb,
ptask->max_payload + IEEE1394_GASP_HDR_SIZE);
} else {
skb_pull(skb, ptask->max_payload);
}
if (ptask->outstanding_pkts > 1) {
fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_INTFRAG,
dg_size, fg_off, datagram_label);
} else {
fwnet_make_sf_hdr(&ptask->hdr, RFC2374_HDR_LASTFRAG,
dg_size, fg_off, datagram_label);
ptask->max_payload = skb->len + RFC2374_FRAG_HDR_SIZE;
}
fwnet_send_packet(ptask);
}
if (free)
fwnet_free_ptask(ptask);
}
static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
{
struct fwnet_device *dev = ptask->dev;
unsigned long flags;
bool free;
spin_lock_irqsave(&dev->lock, flags);
/* One fragment failed; don't try to send remaining fragments. */
ptask->outstanding_pkts = 0;
/* Check whether we or the networking TX soft-IRQ is last user. */
free = ptask->enqueued;
if (free)
dec_queued_datagrams(dev);
dev->netdev->stats.tx_dropped++;
dev->netdev->stats.tx_errors++;
spin_unlock_irqrestore(&dev->lock, flags);
if (free)
fwnet_free_ptask(ptask);
}
static void fwnet_write_complete(struct fw_card *card, int rcode,
void *payload, size_t length, void *data)
{
struct fwnet_packet_task *ptask = data;
static unsigned long j;
static int last_rcode, errors_skipped;
if (rcode == RCODE_COMPLETE) {
fwnet_transmit_packet_done(ptask);
} else {
if (printk_timed_ratelimit(&j, 1000) || rcode != last_rcode) {
dev_err(&ptask->dev->netdev->dev,
"fwnet_write_complete failed: %x (skipped %d)\n",
rcode, errors_skipped);
errors_skipped = 0;
last_rcode = rcode;
} else {
errors_skipped++;
}
fwnet_transmit_packet_failed(ptask);
}
}
static int fwnet_send_packet(struct fwnet_packet_task *ptask)
{
struct fwnet_device *dev;
unsigned tx_len;
struct rfc2734_header *bufhdr;
unsigned long flags;
bool free;
dev = ptask->dev;
tx_len = ptask->max_payload;
switch (fwnet_get_hdr_lf(&ptask->hdr)) {
case RFC2374_HDR_UNFRAG:
bufhdr = skb_push(ptask->skb, RFC2374_UNFRAG_HDR_SIZE);
put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
break;
case RFC2374_HDR_FIRSTFRAG:
case RFC2374_HDR_INTFRAG:
case RFC2374_HDR_LASTFRAG:
bufhdr = skb_push(ptask->skb, RFC2374_FRAG_HDR_SIZE);
put_unaligned_be32(ptask->hdr.w0, &bufhdr->w0);
put_unaligned_be32(ptask->hdr.w1, &bufhdr->w1);
break;
default:
BUG();
}
if (ptask->dest_node == IEEE1394_ALL_NODES) {
u8 *p;
int generation;
int node_id;
unsigned int sw_version;
/* ptask->generation may not have been set yet */
generation = dev->card->generation;
smp_rmb();
node_id = dev->card->node_id;
switch (ptask->skb->protocol) {
default:
sw_version = RFC2734_SW_VERSION;
break;
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
sw_version = RFC3146_SW_VERSION;
#endif
}
p = skb_push(ptask->skb, IEEE1394_GASP_HDR_SIZE);
put_unaligned_be32(node_id << 16 | IANA_SPECIFIER_ID >> 8, p);
put_unaligned_be32((IANA_SPECIFIER_ID & 0xff) << 24
| sw_version, &p[4]);
/* We should not transmit if broadcast_channel.valid == 0. */