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![Eric Dumazet](/assets/img/avatar_default.png)
KCSAN reported a data-race [1] While we can use READ_ONCE() on the read sides, we need to make sure hh->hh_len is written last. [1] BUG: KCSAN: data-race in eth_header_cache / neigh_resolve_output write to 0xffff8880b9dedcb8 of 4 bytes by task 29760 on cpu 0: eth_header_cache+0xa9/0xd0 net/ethernet/eth.c:247 neigh_hh_init net/core/neighbour.c:1463 [inline] neigh_resolve_output net/core/neighbour.c:1480 [inline] neigh_resolve_output+0x415/0x470 net/core/neighbour.c:1470 neigh_output include/net/neighbour.h:511 [inline] ip6_finish_output2+0x7a2/0xec0 net/ipv6/ip6_output.c:116 __ip6_finish_output net/ipv6/ip6_output.c:142 [inline] __ip6_finish_output+0x2d7/0x330 net/ipv6/ip6_output.c:127 ip6_finish_output+0x41/0x160 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0xf2/0x280 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ndisc_send_skb+0x459/0x5f0 net/ipv6/ndisc.c:505 ndisc_send_ns+0x207/0x430 net/ipv6/ndisc.c:647 rt6_probe_deferred+0x98/0xf0 net/ipv6/route.c:615 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269 worker_thread+0xa0/0x800 kernel/workqueue.c:2415 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 read to 0xffff8880b9dedcb8 of 4 bytes by task 29572 on cpu 1: neigh_resolve_output net/core/neighbour.c:1479 [inline] neigh_resolve_output+0x113/0x470 net/core/neighbour.c:1470 neigh_output include/net/neighbour.h:511 [inline] ip6_finish_output2+0x7a2/0xec0 net/ipv6/ip6_output.c:116 __ip6_finish_output net/ipv6/ip6_output.c:142 [inline] __ip6_finish_output+0x2d7/0x330 net/ipv6/ip6_output.c:127 ip6_finish_output+0x41/0x160 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0xf2/0x280 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ndisc_send_skb+0x459/0x5f0 net/ipv6/ndisc.c:505 ndisc_send_ns+0x207/0x430 net/ipv6/ndisc.c:647 rt6_probe_deferred+0x98/0xf0 net/ipv6/route.c:615 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269 worker_thread+0xa0/0x800 kernel/workqueue.c:2415 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 29572 Comm: kworker/1:4 Not tainted 5.4.0-rc6+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events rt6_probe_deferred Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1719 lines
42 KiB
C
1719 lines
42 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* IPv4 over IEEE 1394, per RFC 2734
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* IPv6 over IEEE 1394, per RFC 3146
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*
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* Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com>
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*
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* based on eth1394 by Ben Collins et al
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*/
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#include <linux/bug.h>
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#include <linux/compiler.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/ethtool.h>
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#include <linux/firewire.h>
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#include <linux/firewire-constants.h>
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#include <linux/highmem.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/jiffies.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/mutex.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <asm/unaligned.h>
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#include <net/arp.h>
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#include <net/firewire.h>
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/* rx limits */
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#define FWNET_MAX_FRAGMENTS 30 /* arbitrary, > TX queue depth */
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#define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16*1024 ? 4 : 2)
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/* tx limits */
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#define FWNET_MAX_QUEUED_DATAGRAMS 20 /* < 64 = number of tlabels */
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#define FWNET_MIN_QUEUED_DATAGRAMS 10 /* should keep AT DMA busy enough */
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#define FWNET_TX_QUEUE_LEN FWNET_MAX_QUEUED_DATAGRAMS /* ? */
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#define IEEE1394_BROADCAST_CHANNEL 31
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#define IEEE1394_ALL_NODES (0xffc0 | 0x003f)
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#define IEEE1394_MAX_PAYLOAD_S100 512
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#define FWNET_NO_FIFO_ADDR (~0ULL)
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#define IANA_SPECIFIER_ID 0x00005eU
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#define RFC2734_SW_VERSION 0x000001U
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#define RFC3146_SW_VERSION 0x000002U
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#define IEEE1394_GASP_HDR_SIZE 8
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#define RFC2374_UNFRAG_HDR_SIZE 4
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#define RFC2374_FRAG_HDR_SIZE 8
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#define RFC2374_FRAG_OVERHEAD 4
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#define RFC2374_HDR_UNFRAG 0 /* unfragmented */
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#define RFC2374_HDR_FIRSTFRAG 1 /* first fragment */
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#define RFC2374_HDR_LASTFRAG 2 /* last fragment */
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#define RFC2374_HDR_INTFRAG 3 /* interior fragment */
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static bool fwnet_hwaddr_is_multicast(u8 *ha)
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{
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return !!(*ha & 1);
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}
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/* IPv4 and IPv6 encapsulation header */
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struct rfc2734_header {
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u32 w0;
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u32 w1;
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};
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#define fwnet_get_hdr_lf(h) (((h)->w0 & 0xc0000000) >> 30)
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#define fwnet_get_hdr_ether_type(h) (((h)->w0 & 0x0000ffff))
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#define fwnet_get_hdr_dg_size(h) ((((h)->w0 & 0x0fff0000) >> 16) + 1)
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#define fwnet_get_hdr_fg_off(h) (((h)->w0 & 0x00000fff))
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#define fwnet_get_hdr_dgl(h) (((h)->w1 & 0xffff0000) >> 16)
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#define fwnet_set_hdr_lf(lf) ((lf) << 30)
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#define fwnet_set_hdr_ether_type(et) (et)
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#define fwnet_set_hdr_dg_size(dgs) (((dgs) - 1) << 16)
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#define fwnet_set_hdr_fg_off(fgo) (fgo)
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#define fwnet_set_hdr_dgl(dgl) ((dgl) << 16)
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static inline void fwnet_make_uf_hdr(struct rfc2734_header *hdr,
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unsigned ether_type)
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{
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hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_UNFRAG)
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| fwnet_set_hdr_ether_type(ether_type);
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}
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static inline void fwnet_make_ff_hdr(struct rfc2734_header *hdr,
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unsigned ether_type, unsigned dg_size, unsigned dgl)
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{
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hdr->w0 = fwnet_set_hdr_lf(RFC2374_HDR_FIRSTFRAG)
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| fwnet_set_hdr_dg_size(dg_size)
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| fwnet_set_hdr_ether_type(ether_type);
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hdr->w1 = fwnet_set_hdr_dgl(dgl);
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}
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static inline void fwnet_make_sf_hdr(struct rfc2734_header *hdr,
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unsigned lf, unsigned dg_size, unsigned fg_off, unsigned dgl)
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{
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hdr->w0 = fwnet_set_hdr_lf(lf)
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| fwnet_set_hdr_dg_size(dg_size)
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| fwnet_set_hdr_fg_off(fg_off);
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hdr->w1 = fwnet_set_hdr_dgl(dgl);
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}
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/* This list keeps track of what parts of the datagram have been filled in */
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struct fwnet_fragment_info {
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struct list_head fi_link;
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u16 offset;
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u16 len;
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};
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struct fwnet_partial_datagram {
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struct list_head pd_link;
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struct list_head fi_list;
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struct sk_buff *skb;
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/* FIXME Why not use skb->data? */
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char *pbuf;
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u16 datagram_label;
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u16 ether_type;
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u16 datagram_size;
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};
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static DEFINE_MUTEX(fwnet_device_mutex);
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static LIST_HEAD(fwnet_device_list);
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struct fwnet_device {
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struct list_head dev_link;
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spinlock_t lock;
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enum {
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FWNET_BROADCAST_ERROR,
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FWNET_BROADCAST_RUNNING,
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FWNET_BROADCAST_STOPPED,
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} broadcast_state;
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struct fw_iso_context *broadcast_rcv_context;
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struct fw_iso_buffer broadcast_rcv_buffer;
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void **broadcast_rcv_buffer_ptrs;
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unsigned broadcast_rcv_next_ptr;
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unsigned num_broadcast_rcv_ptrs;
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unsigned rcv_buffer_size;
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/*
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* This value is the maximum unfragmented datagram size that can be
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* sent by the hardware. It already has the GASP overhead and the
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* unfragmented datagram header overhead calculated into it.
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*/
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unsigned broadcast_xmt_max_payload;
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u16 broadcast_xmt_datagramlabel;
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/*
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* The CSR address that remote nodes must send datagrams to for us to
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* receive them.
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*/
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struct fw_address_handler handler;
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u64 local_fifo;
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/* Number of tx datagrams that have been queued but not yet acked */
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int queued_datagrams;
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int peer_count;
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struct list_head peer_list;
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struct fw_card *card;
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struct net_device *netdev;
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};
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struct fwnet_peer {
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struct list_head peer_link;
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struct fwnet_device *dev;
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u64 guid;
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/* guarded by dev->lock */
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struct list_head pd_list; /* received partial datagrams */
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unsigned pdg_size; /* pd_list size */
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u16 datagram_label; /* outgoing datagram label */
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u16 max_payload; /* includes RFC2374_FRAG_HDR_SIZE overhead */
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int node_id;
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int generation;
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unsigned speed;
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};
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/* This is our task struct. It's used for the packet complete callback. */
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struct fwnet_packet_task {
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struct fw_transaction transaction;
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struct rfc2734_header hdr;
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struct sk_buff *skb;
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struct fwnet_device *dev;
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int outstanding_pkts;
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u64 fifo_addr;
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u16 dest_node;
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u16 max_payload;
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u8 generation;
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u8 speed;
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u8 enqueued;
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};
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/*
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* Get fifo address embedded in hwaddr
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*/
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static __u64 fwnet_hwaddr_fifo(union fwnet_hwaddr *ha)
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{
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return (u64)get_unaligned_be16(&ha->uc.fifo_hi) << 32
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| get_unaligned_be32(&ha->uc.fifo_lo);
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}
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/*
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* saddr == NULL means use device source address.
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* daddr == NULL means leave destination address (eg unresolved arp).
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*/
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static int fwnet_header_create(struct sk_buff *skb, struct net_device *net,
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unsigned short type, const void *daddr,
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const void *saddr, unsigned len)
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{
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struct fwnet_header *h;
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h = skb_push(skb, sizeof(*h));
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put_unaligned_be16(type, &h->h_proto);
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if (net->flags & (IFF_LOOPBACK | IFF_NOARP)) {
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memset(h->h_dest, 0, net->addr_len);
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return net->hard_header_len;
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}
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if (daddr) {
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memcpy(h->h_dest, daddr, net->addr_len);
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return net->hard_header_len;
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}
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return -net->hard_header_len;
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}
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static int fwnet_header_cache(const struct neighbour *neigh,
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struct hh_cache *hh, __be16 type)
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{
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struct net_device *net;
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struct fwnet_header *h;
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if (type == cpu_to_be16(ETH_P_802_3))
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return -1;
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net = neigh->dev;
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h = (struct fwnet_header *)((u8 *)hh->hh_data + HH_DATA_OFF(sizeof(*h)));
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h->h_proto = type;
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memcpy(h->h_dest, neigh->ha, net->addr_len);
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/* Pairs with the READ_ONCE() in neigh_resolve_output(),
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* neigh_hh_output() and neigh_update_hhs().
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*/
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smp_store_release(&hh->hh_len, FWNET_HLEN);
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return 0;
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}
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/* Called by Address Resolution module to notify changes in address. */
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static void fwnet_header_cache_update(struct hh_cache *hh,
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const struct net_device *net, const unsigned char *haddr)
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{
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memcpy((u8 *)hh->hh_data + HH_DATA_OFF(FWNET_HLEN), haddr, net->addr_len);
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}
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static int fwnet_header_parse(const struct sk_buff *skb, unsigned char *haddr)
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{
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memcpy(haddr, skb->dev->dev_addr, FWNET_ALEN);
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return FWNET_ALEN;
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}
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static const struct header_ops fwnet_header_ops = {
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.create = fwnet_header_create,
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.cache = fwnet_header_cache,
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.cache_update = fwnet_header_cache_update,
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.parse = fwnet_header_parse,
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};
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/* FIXME: is this correct for all cases? */
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static bool fwnet_frag_overlap(struct fwnet_partial_datagram *pd,
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unsigned offset, unsigned len)
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{
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struct fwnet_fragment_info *fi;
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unsigned end = offset + len;
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list_for_each_entry(fi, &pd->fi_list, fi_link)
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if (offset < fi->offset + fi->len && end > fi->offset)
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return true;
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return false;
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}
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/* Assumes that new fragment does not overlap any existing fragments */
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static struct fwnet_fragment_info *fwnet_frag_new(
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struct fwnet_partial_datagram *pd, unsigned offset, unsigned len)
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{
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struct fwnet_fragment_info *fi, *fi2, *new;
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struct list_head *list;
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list = &pd->fi_list;
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list_for_each_entry(fi, &pd->fi_list, fi_link) {
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if (fi->offset + fi->len == offset) {
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/* The new fragment can be tacked on to the end */
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/* Did the new fragment plug a hole? */
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fi2 = list_entry(fi->fi_link.next,
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struct fwnet_fragment_info, fi_link);
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if (fi->offset + fi->len == fi2->offset) {
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/* glue fragments together */
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fi->len += len + fi2->len;
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list_del(&fi2->fi_link);
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kfree(fi2);
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} else {
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fi->len += len;
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}
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return fi;
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}
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if (offset + len == fi->offset) {
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/* The new fragment can be tacked on to the beginning */
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/* Did the new fragment plug a hole? */
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fi2 = list_entry(fi->fi_link.prev,
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struct fwnet_fragment_info, fi_link);
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if (fi2->offset + fi2->len == fi->offset) {
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/* glue fragments together */
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fi2->len += fi->len + len;
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list_del(&fi->fi_link);
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kfree(fi);
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return fi2;
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}
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fi->offset = offset;
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fi->len += len;
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return fi;
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}
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if (offset > fi->offset + fi->len) {
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list = &fi->fi_link;
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break;
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}
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if (offset + len < fi->offset) {
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list = fi->fi_link.prev;
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break;
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}
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}
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new = kmalloc(sizeof(*new), GFP_ATOMIC);
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if (!new)
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return NULL;
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new->offset = offset;
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new->len = len;
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list_add(&new->fi_link, list);
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return new;
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}
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static struct fwnet_partial_datagram *fwnet_pd_new(struct net_device *net,
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struct fwnet_peer *peer, u16 datagram_label, unsigned dg_size,
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void *frag_buf, unsigned frag_off, unsigned frag_len)
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{
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struct fwnet_partial_datagram *new;
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struct fwnet_fragment_info *fi;
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new = kmalloc(sizeof(*new), GFP_ATOMIC);
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if (!new)
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goto fail;
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INIT_LIST_HEAD(&new->fi_list);
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fi = fwnet_frag_new(new, frag_off, frag_len);
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if (fi == NULL)
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goto fail_w_new;
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new->datagram_label = datagram_label;
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new->datagram_size = dg_size;
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new->skb = dev_alloc_skb(dg_size + LL_RESERVED_SPACE(net));
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if (new->skb == NULL)
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goto fail_w_fi;
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skb_reserve(new->skb, LL_RESERVED_SPACE(net));
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new->pbuf = skb_put(new->skb, dg_size);
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memcpy(new->pbuf + frag_off, frag_buf, frag_len);
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list_add_tail(&new->pd_link, &peer->pd_list);
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return new;
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fail_w_fi:
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kfree(fi);
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fail_w_new:
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kfree(new);
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fail:
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return NULL;
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}
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static struct fwnet_partial_datagram *fwnet_pd_find(struct fwnet_peer *peer,
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u16 datagram_label)
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{
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struct fwnet_partial_datagram *pd;
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list_for_each_entry(pd, &peer->pd_list, pd_link)
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if (pd->datagram_label == datagram_label)
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return pd;
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return NULL;
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}
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|
|
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static void fwnet_pd_delete(struct fwnet_partial_datagram *old)
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{
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struct fwnet_fragment_info *fi, *n;
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list_for_each_entry_safe(fi, n, &old->fi_list, fi_link)
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kfree(fi);
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list_del(&old->pd_link);
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dev_kfree_skb_any(old->skb);
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kfree(old);
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}
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|
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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);
|