| /* |
| * 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; |
| }; |
| |
| /* |
| * Get fifo address embedded in hwaddr |
| */ |
| static __u64 fwnet_hwaddr_fifo(union fwnet_hwaddr *ha) |
| { |
| return (u64)get_unaligned_be16(&ha->uc.fifo_hi) << 32 |
| | get_unaligned_be32(&ha->uc.fifo_lo); |
| } |
| |
| /* |
| * 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); |
| 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) |
| { |
| struct fwnet_device *dev; |
| int status; |
| __be64 guid; |
| |
| 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; |
| } |
| |
| dev = netdev_priv(net); |
| /* 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. |
| */ |
| guid = cpu_to_be64(dev->card->guid); |
| 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; |
| } |
| 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 += skb->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 = fwnet_hwaddr_fifo(ha); |
| 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; |
| int ret; |
| union fwnet_hwaddr *ha; |
| |
| 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 = (union fwnet_hwaddr *)net->dev_addr; |
| put_unaligned_be64(card->guid, &ha->uc.uniq_id); |
| ha->uc.max_rec = dev->card->max_receive; |
| ha->uc.sspd = dev->card->link_speed; |
| put_unaligned_be16(dev->local_fifo >> 32, &ha->uc.fifo_hi); |
| put_unaligned_be32(dev->local_fifo & 0xffffffff, &ha->uc.fifo_lo); |
| |
| 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); |