diff options
Diffstat (limited to 'drivers/firewire/net.c')
| -rw-r--r-- | drivers/firewire/net.c | 1707 |
1 files changed, 1707 insertions, 0 deletions
diff --git a/drivers/firewire/net.c b/drivers/firewire/net.c new file mode 100644 index 000000000..a53eacebc --- /dev/null +++ b/drivers/firewire/net.c @@ -0,0 +1,1707 @@ +// 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 <fenlason@redhat.com> + * + * 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) { + kfree(r); + + return; + } + + 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. */ + fw_send_request(dev->card, &ptask->transaction, + TCODE_STREAM_DATA, + fw_stream_packet_destination_id(3, + IEEE1394_BROADCAST_CHANNEL, 0), + generation, SCODE_100, 0ULL, ptask->skb->data, + tx_len + 8, fwnet_write_complete, ptask); + + spin_lock_irqsave(&dev->lock, flags); + + /* If the AT tasklet already ran, we may be last user. */ + free = (ptask->outstanding_pkts == 0 && !ptask->enqueued); + if (!free) + ptask->enqueued = true; + else + dec_queued_datagrams(dev); + + spin_unlock_irqrestore(&dev->lock, flags); + + goto out; + } + + fw_send_request(dev->card, &ptask->transaction, + TCODE_WRITE_BLOCK_REQUEST, ptask->dest_node, + ptask->generation, ptask->speed, ptask->fifo_addr, + ptask->skb->data, tx_len, fwnet_write_complete, ptask); + + spin_lock_irqsave(&dev->lock, flags); + + /* If the AT tasklet already ran, we may be last user. */ + free = (ptask->outstanding_pkts == 0 && !ptask->enqueued); + if (!free) + ptask->enqueued = true; + else + dec_queued_datagrams(dev); + + spin_unlock_irqrestore(&dev->lock, flags); + + netif_trans_update(dev->netdev); + out: + if (free) + fwnet_free_ptask(ptask); + + return 0; +} + +static void fwnet_fifo_stop(struct fwnet_device *dev) +{ + if (dev->local_fifo == FWNET_NO_FIFO_ADDR) + return; + + fw_core_remove_address_handler(&dev->handler); + dev->local_fifo = FWNET_NO_FIFO_ADDR; +} + +static int fwnet_fifo_start(struct fwnet_device *dev) +{ + int retval; + + if (dev->local_fifo != FWNET_NO_FIFO_ADDR) + return 0; + + dev->handler.length = 4096; + dev->handler.address_callback = fwnet_receive_packet; + dev->handler.callback_data = dev; + + retval = fw_core_add_address_handler(&dev->handler, + &fw_high_memory_region); + if (retval < 0) + return retval; + + dev->local_fifo = dev->handler.offset; + + return 0; +} + +static void __fwnet_broadcast_stop(struct fwnet_device *dev) +{ + unsigned u; + + if (dev->broadcast_state != FWNET_BROADCAST_ERROR) { + for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) + kunmap(dev->broadcast_rcv_buffer.pages[u]); + fw_iso_buffer_destroy(&dev->broadcast_rcv_buffer, dev->card); + } + if (dev->broadcast_rcv_context) { + fw_iso_context_destroy(dev->broadcast_rcv_context); + dev->broadcast_rcv_context = NULL; + } + kfree(dev->broadcast_rcv_buffer_ptrs); + dev->broadcast_rcv_buffer_ptrs = NULL; + dev->broadcast_state = FWNET_BROADCAST_ERROR; +} + +static void fwnet_broadcast_stop(struct fwnet_device *dev) +{ + if (dev->broadcast_state == FWNET_BROADCAST_ERROR) + return; + fw_iso_context_stop(dev->broadcast_rcv_context); + __fwnet_broadcast_stop(dev); +} + +static int fwnet_broadcast_start(struct fwnet_device *dev) +{ + struct fw_iso_context *context; + int retval; + unsigned num_packets; + unsigned max_receive; + struct fw_iso_packet packet; + unsigned long offset; + void **ptrptr; + unsigned u; + + if (dev->broadcast_state != FWNET_BROADCAST_ERROR) + return 0; + + max_receive = 1U << (dev->card->max_receive + 1); + num_packets = (FWNET_ISO_PAGE_COUNT * PAGE_SIZE) / max_receive; + + ptrptr = kmalloc_array(num_packets, sizeof(void *), GFP_KERNEL); + if (!ptrptr) { + retval = -ENOMEM; + goto failed; + } + dev->broadcast_rcv_buffer_ptrs = ptrptr; + + context = fw_iso_context_create(dev->card, FW_ISO_CONTEXT_RECEIVE, + IEEE1394_BROADCAST_CHANNEL, + dev->card->link_speed, 8, + fwnet_receive_broadcast, dev); + if (IS_ERR(context)) { + retval = PTR_ERR(context); + goto failed; + } + + retval = fw_iso_buffer_init(&dev->broadcast_rcv_buffer, dev->card, + FWNET_ISO_PAGE_COUNT, DMA_FROM_DEVICE); + if (retval < 0) + goto failed; + + dev->broadcast_state = FWNET_BROADCAST_STOPPED; + + for (u = 0; u < FWNET_ISO_PAGE_COUNT; u++) { + void *ptr; + unsigned v; + + ptr = kmap(dev->broadcast_rcv_buffer.pages[u]); + for (v = 0; v < num_packets / FWNET_ISO_PAGE_COUNT; v++) + *ptrptr++ = (void *) ((char *)ptr + v * max_receive); + } + dev->broadcast_rcv_context = context; + + packet.payload_length = max_receive; + packet.interrupt = 1; + packet.skip = 0; + packet.tag = 3; + packet.sy = 0; + packet.header_length = IEEE1394_GASP_HDR_SIZE; + offset = 0; + + for (u = 0; u < num_packets; u++) { + retval = fw_iso_context_queue(context, &packet, + &dev->broadcast_rcv_buffer, offset); + if (retval < 0) + goto failed; + + offset += max_receive; + } + dev->num_broadcast_rcv_ptrs = num_packets; + dev->rcv_buffer_size = max_receive; + dev->broadcast_rcv_next_ptr = 0U; + retval = fw_iso_context_start(context, -1, 0, + FW_ISO_CONTEXT_MATCH_ALL_TAGS); /* ??? sync */ + if (retval < 0) + goto failed; + + /* FIXME: adjust it according to the min. speed of all known peers? */ + dev->broadcast_xmt_max_payload = IEEE1394_MAX_PAYLOAD_S100 + - IEEE1394_GASP_HDR_SIZE - RFC2374_UNFRAG_HDR_SIZE; + dev->broadcast_state = FWNET_BROADCAST_RUNNING; + + return 0; + + failed: + __fwnet_broadcast_stop(dev); + return retval; +} + +static void set_carrier_state(struct fwnet_device *dev) +{ + if (dev->peer_count > 1) + netif_carrier_on(dev->netdev); + else + netif_carrier_off(dev->netdev); +} + +/* ifup */ +static int fwnet_open(struct net_device *net) +{ + struct fwnet_device *dev = netdev_priv(net); + int ret; + + ret = fwnet_broadcast_start(dev); + if (ret) + return ret; + + netif_start_queue(net); + + spin_lock_irq(&dev->lock); + set_carrier_state(dev); + spin_unlock_irq(&dev->lock); + + return 0; +} + +/* ifdown */ +static int fwnet_stop(struct net_device *net) +{ + struct fwnet_device *dev = netdev_priv(net); + + netif_stop_queue(net); + fwnet_broadcast_stop(dev); + + return 0; +} + +static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net) +{ + struct fwnet_header hdr_buf; + struct fwnet_device *dev = netdev_priv(net); + __be16 proto; + u16 dest_node; + unsigned max_payload; + u16 dg_size; + u16 *datagram_label_ptr; + struct fwnet_packet_task *ptask; + struct fwnet_peer *peer; + unsigned long flags; + + spin_lock_irqsave(&dev->lock, flags); + + /* Can this happen? */ + if (netif_queue_stopped(dev->netdev)) { + spin_unlock_irqrestore(&dev->lock, flags); + + return NETDEV_TX_BUSY; + } + + ptask = kmem_cache_alloc(fwnet_packet_task_cache, GFP_ATOMIC); + if (ptask == NULL) + goto fail; + + skb = skb_share_check(skb, GFP_ATOMIC); + if (!skb) + goto fail; + + /* + * Make a copy of the driver-specific header. + * We might need to rebuild the header on tx failure. + */ + memcpy(&hdr_buf, skb->data, sizeof(hdr_buf)); + proto = hdr_buf.h_proto; + + switch (proto) { + case htons(ETH_P_ARP): + case htons(ETH_P_IP): +#if IS_ENABLED(CONFIG_IPV6) + case htons(ETH_P_IPV6): +#endif + break; + default: + goto fail; + } + + skb_pull(skb, sizeof(hdr_buf)); + dg_size = skb->len; + + /* + * Set the transmission type for the packet. ARP packets and IP + * broadcast packets are sent via GASP. + */ + if (fwnet_hwaddr_is_multicast(hdr_buf.h_dest)) { + max_payload = dev->broadcast_xmt_max_payload; + datagram_label_ptr = &dev->broadcast_xmt_datagramlabel; + + ptask->fifo_addr = FWNET_NO_FIFO_ADDR; + ptask->generation = 0; + ptask->dest_node = IEEE1394_ALL_NODES; + ptask->speed = SCODE_100; + } else { + union fwnet_hwaddr *ha = (union fwnet_hwaddr *)hdr_buf.h_dest; + __be64 guid = get_unaligned(&ha->uc.uniq_id); + u8 generation; + + peer = fwnet_peer_find_by_guid(dev, be64_to_cpu(guid)); + if (!peer) + goto fail; + + generation = peer->generation; + dest_node = peer->node_id; + max_payload = peer->max_payload; + datagram_label_ptr = &peer->datagram_label; + + ptask->fifo_addr = get_unaligned_be48(ha->uc.fifo); + ptask->generation = generation; + ptask->dest_node = dest_node; + ptask->speed = peer->speed; + } + + ptask->hdr.w0 = 0; + ptask->hdr.w1 = 0; + ptask->skb = skb; + ptask->dev = dev; + + /* Does it all fit in one packet? */ + if (dg_size <= max_payload) { + fwnet_make_uf_hdr(&ptask->hdr, ntohs(proto)); + ptask->outstanding_pkts = 1; + max_payload = dg_size + RFC2374_UNFRAG_HDR_SIZE; + } else { + u16 datagram_label; + + max_payload -= RFC2374_FRAG_OVERHEAD; + datagram_label = (*datagram_label_ptr)++; + fwnet_make_ff_hdr(&ptask->hdr, ntohs(proto), dg_size, + datagram_label); + ptask->outstanding_pkts = DIV_ROUND_UP(dg_size, max_payload); + max_payload += RFC2374_FRAG_HDR_SIZE; + } + + if (++dev->queued_datagrams == FWNET_MAX_QUEUED_DATAGRAMS) + netif_stop_queue(dev->netdev); + + spin_unlock_irqrestore(&dev->lock, flags); + + ptask->max_payload = max_payload; + ptask->enqueued = 0; + + fwnet_send_packet(ptask); + + return NETDEV_TX_OK; + + fail: + spin_unlock_irqrestore(&dev->lock, flags); + + if (ptask) + kmem_cache_free(fwnet_packet_task_cache, ptask); + + if (skb != NULL) + dev_kfree_skb(skb); + + net->stats.tx_dropped++; + net->stats.tx_errors++; + + /* + * FIXME: According to a patch from 2003-02-26, "returning non-zero + * causes serious problems" here, allegedly. Before that patch, + * -ERRNO was returned which is not appropriate under Linux 2.6. + * Perhaps more needs to be done? Stop the queue in serious + * conditions and restart it elsewhere? + */ + return NETDEV_TX_OK; +} + +static const struct ethtool_ops fwnet_ethtool_ops = { + .get_link = ethtool_op_get_link, +}; + +static const struct net_device_ops fwnet_netdev_ops = { + .ndo_open = fwnet_open, + .ndo_stop = fwnet_stop, + .ndo_start_xmit = fwnet_tx, +}; + +static void fwnet_init_dev(struct net_device *net) +{ + net->header_ops = &fwnet_header_ops; + net->netdev_ops = &fwnet_netdev_ops; + net->watchdog_timeo = 2 * HZ; + net->flags = IFF_BROADCAST | IFF_MULTICAST; + net->features = NETIF_F_HIGHDMA; + net->addr_len = FWNET_ALEN; + net->hard_header_len = FWNET_HLEN; + net->type = ARPHRD_IEEE1394; + net->tx_queue_len = FWNET_TX_QUEUE_LEN; + net->ethtool_ops = &fwnet_ethtool_ops; +} + +/* caller must hold fwnet_device_mutex */ +static struct fwnet_device *fwnet_dev_find(struct fw_card *card) +{ + struct fwnet_device *dev; + + list_for_each_entry(dev, &fwnet_device_list, dev_link) + if (dev->card == card) + return dev; + + return NULL; +} + +static int fwnet_add_peer(struct fwnet_device *dev, + struct fw_unit *unit, struct fw_device *device) +{ + struct fwnet_peer *peer; + + peer = kmalloc(sizeof(*peer), GFP_KERNEL); + if (!peer) + return -ENOMEM; + + dev_set_drvdata(&unit->device, peer); + + peer->dev = dev; + peer->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4]; + INIT_LIST_HEAD(&peer->pd_list); + peer->pdg_size = 0; + peer->datagram_label = 0; + peer->speed = device->max_speed; + peer->max_payload = fwnet_max_payload(device->max_rec, peer->speed); + + peer->generation = device->generation; + smp_rmb(); + peer->node_id = device->node_id; + + spin_lock_irq(&dev->lock); + list_add_tail(&peer->peer_link, &dev->peer_list); + dev->peer_count++; + set_carrier_state(dev); + spin_unlock_irq(&dev->lock); + + return 0; +} + +static int fwnet_probe(struct fw_unit *unit, + const struct ieee1394_device_id *id) +{ + struct fw_device *device = fw_parent_device(unit); + struct fw_card *card = device->card; + struct net_device *net; + bool allocated_netdev = false; + struct fwnet_device *dev; + union fwnet_hwaddr ha; + int ret; + + mutex_lock(&fwnet_device_mutex); + + dev = fwnet_dev_find(card); + if (dev) { + net = dev->netdev; + goto have_dev; + } + + net = alloc_netdev(sizeof(*dev), "firewire%d", NET_NAME_UNKNOWN, + fwnet_init_dev); + if (net == NULL) { + mutex_unlock(&fwnet_device_mutex); + return -ENOMEM; + } + + allocated_netdev = true; + SET_NETDEV_DEV(net, card->device); + dev = netdev_priv(net); + + spin_lock_init(&dev->lock); + dev->broadcast_state = FWNET_BROADCAST_ERROR; + dev->broadcast_rcv_context = NULL; + dev->broadcast_xmt_max_payload = 0; + dev->broadcast_xmt_datagramlabel = 0; + dev->local_fifo = FWNET_NO_FIFO_ADDR; + dev->queued_datagrams = 0; + INIT_LIST_HEAD(&dev->peer_list); + dev->card = card; + dev->netdev = net; + + ret = fwnet_fifo_start(dev); + if (ret < 0) + goto out; + dev->local_fifo = dev->handler.offset; + + /* + * default MTU: RFC 2734 cl. 4, RFC 3146 cl. 4 + * maximum MTU: RFC 2734 cl. 4.2, fragment encapsulation header's + * maximum possible datagram_size + 1 = 0xfff + 1 + */ + net->mtu = 1500U; + net->min_mtu = ETH_MIN_MTU; + net->max_mtu = 4096U; + + /* Set our hardware address while we're at it */ + ha.uc.uniq_id = cpu_to_be64(card->guid); + ha.uc.max_rec = dev->card->max_receive; + ha.uc.sspd = dev->card->link_speed; + put_unaligned_be48(dev->local_fifo, ha.uc.fifo); + dev_addr_set(net, ha.u); + + memset(net->broadcast, -1, net->addr_len); + + ret = register_netdev(net); + if (ret) + goto out; + + list_add_tail(&dev->dev_link, &fwnet_device_list); + dev_notice(&net->dev, "IP over IEEE 1394 on card %s\n", + dev_name(card->device)); + have_dev: + ret = fwnet_add_peer(dev, unit, device); + if (ret && allocated_netdev) { + unregister_netdev(net); + list_del(&dev->dev_link); + out: + fwnet_fifo_stop(dev); + free_netdev(net); + } + + mutex_unlock(&fwnet_device_mutex); + + return ret; +} + +/* + * FIXME abort partially sent fragmented datagrams, + * discard partially received fragmented datagrams + */ +static void fwnet_update(struct fw_unit *unit) +{ + struct fw_device *device = fw_parent_device(unit); + struct fwnet_peer *peer = dev_get_drvdata(&unit->device); + int generation; + + generation = device->generation; + + spin_lock_irq(&peer->dev->lock); + peer->node_id = device->node_id; + peer->generation = generation; + spin_unlock_irq(&peer->dev->lock); +} + +static void fwnet_remove_peer(struct fwnet_peer *peer, struct fwnet_device *dev) +{ + struct fwnet_partial_datagram *pd, *pd_next; + + spin_lock_irq(&dev->lock); + list_del(&peer->peer_link); + dev->peer_count--; + set_carrier_state(dev); + spin_unlock_irq(&dev->lock); + + list_for_each_entry_safe(pd, pd_next, &peer->pd_list, pd_link) + fwnet_pd_delete(pd); + + kfree(peer); +} + +static void fwnet_remove(struct fw_unit *unit) +{ + struct fwnet_peer *peer = dev_get_drvdata(&unit->device); + struct fwnet_device *dev = peer->dev; + struct net_device *net; + int i; + + mutex_lock(&fwnet_device_mutex); + + net = dev->netdev; + + fwnet_remove_peer(peer, dev); + + if (list_empty(&dev->peer_list)) { + unregister_netdev(net); + + fwnet_fifo_stop(dev); + + for (i = 0; dev->queued_datagrams && i < 5; i++) + ssleep(1); + WARN_ON(dev->queued_datagrams); + list_del(&dev->dev_link); + + free_netdev(net); + } + + mutex_unlock(&fwnet_device_mutex); +} + +static const struct ieee1394_device_id fwnet_id_table[] = { + { + .match_flags = IEEE1394_MATCH_SPECIFIER_ID | + IEEE1394_MATCH_VERSION, + .specifier_id = IANA_SPECIFIER_ID, + .version = RFC2734_SW_VERSION, + }, +#if IS_ENABLED(CONFIG_IPV6) + { + .match_flags = IEEE1394_MATCH_SPECIFIER_ID | + IEEE1394_MATCH_VERSION, + .specifier_id = IANA_SPECIFIER_ID, + .version = RFC3146_SW_VERSION, + }, +#endif + { } +}; + +static struct fw_driver fwnet_driver = { + .driver = { + .owner = THIS_MODULE, + .name = KBUILD_MODNAME, + .bus = &fw_bus_type, + }, + .probe = fwnet_probe, + .update = fwnet_update, + .remove = fwnet_remove, + .id_table = fwnet_id_table, +}; + +static const u32 rfc2374_unit_directory_data[] = { + 0x00040000, /* directory_length */ + 0x1200005e, /* unit_specifier_id: IANA */ + 0x81000003, /* textual descriptor offset */ + 0x13000001, /* unit_sw_version: RFC 2734 */ + 0x81000005, /* textual descriptor offset */ + 0x00030000, /* descriptor_length */ + 0x00000000, /* text */ + 0x00000000, /* minimal ASCII, en */ + 0x49414e41, /* I A N A */ + 0x00030000, /* descriptor_length */ + 0x00000000, /* text */ + 0x00000000, /* minimal ASCII, en */ + 0x49507634, /* I P v 4 */ +}; + +static struct fw_descriptor rfc2374_unit_directory = { + .length = ARRAY_SIZE(rfc2374_unit_directory_data), + .key = (CSR_DIRECTORY | CSR_UNIT) << 24, + .data = rfc2374_unit_directory_data +}; + +#if IS_ENABLED(CONFIG_IPV6) +static const u32 rfc3146_unit_directory_data[] = { + 0x00040000, /* directory_length */ + 0x1200005e, /* unit_specifier_id: IANA */ + 0x81000003, /* textual descriptor offset */ + 0x13000002, /* unit_sw_version: RFC 3146 */ + 0x81000005, /* textual descriptor offset */ + 0x00030000, /* descriptor_length */ + 0x00000000, /* text */ + 0x00000000, /* minimal ASCII, en */ + 0x49414e41, /* I A N A */ + 0x00030000, /* descriptor_length */ + 0x00000000, /* text */ + 0x00000000, /* minimal ASCII, en */ + 0x49507636, /* I P v 6 */ +}; + +static struct fw_descriptor rfc3146_unit_directory = { + .length = ARRAY_SIZE(rfc3146_unit_directory_data), + .key = (CSR_DIRECTORY | CSR_UNIT) << 24, + .data = rfc3146_unit_directory_data +}; +#endif + +static int __init fwnet_init(void) +{ + int err; + + err = fw_core_add_descriptor(&rfc2374_unit_directory); + if (err) + return err; + +#if IS_ENABLED(CONFIG_IPV6) + err = fw_core_add_descriptor(&rfc3146_unit_directory); + if (err) + goto out; +#endif + + fwnet_packet_task_cache = kmem_cache_create("packet_task", + sizeof(struct fwnet_packet_task), 0, 0, NULL); + if (!fwnet_packet_task_cache) { + err = -ENOMEM; + goto out2; + } + + err = driver_register(&fwnet_driver.driver); + if (!err) + return 0; + + kmem_cache_destroy(fwnet_packet_task_cache); +out2: +#if IS_ENABLED(CONFIG_IPV6) + fw_core_remove_descriptor(&rfc3146_unit_directory); +out: +#endif + fw_core_remove_descriptor(&rfc2374_unit_directory); + + return err; +} +module_init(fwnet_init); + +static void __exit fwnet_cleanup(void) +{ + driver_unregister(&fwnet_driver.driver); + kmem_cache_destroy(fwnet_packet_task_cache); +#if IS_ENABLED(CONFIG_IPV6) + fw_core_remove_descriptor(&rfc3146_unit_directory); +#endif + fw_core_remove_descriptor(&rfc2374_unit_directory); +} +module_exit(fwnet_cleanup); + +MODULE_AUTHOR("Jay Fenlason <fenlason@redhat.com>"); +MODULE_DESCRIPTION("IP over IEEE1394 as per RFC 2734/3146"); +MODULE_LICENSE("GPL"); +MODULE_DEVICE_TABLE(ieee1394, fwnet_id_table); |