diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-22 21:29:52 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-22 21:29:52 -0700 |
commit | 1053414068bad659479e6efa62a67403b8b1ec0a (patch) | |
tree | d4096db0f3aa9ca5e6b44c85ab848b7bedbfc37a /drivers/firewire | |
parent | b88f8a546f5dba213938fdfc11e66bc5c2421623 (diff) | |
parent | 0c53decdd0a9f9c459ccabe0b5f79660bde5375b (diff) |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
firewire: new stack is no longer experimental
firewire: net: better FIFO address range check and rcodes
firewire: net: fix card driver reloading
firewire: core: fix iso context shutdown on card removal
firewire: core: fix DMA unmapping in iso buffer removal
firewire: net: adjust net_device ops
firewire: net: remove unused code
firewire: net: allow for unordered unit discovery
firewire: net: style changes
firewire: net: add Kconfig item, rename driver
firewire: add IPv4 support
Diffstat (limited to 'drivers/firewire')
-rw-r--r-- | drivers/firewire/Kconfig | 60 | ||||
-rw-r--r-- | drivers/firewire/Makefile | 4 | ||||
-rw-r--r-- | drivers/firewire/core-card.c | 20 | ||||
-rw-r--r-- | drivers/firewire/core-iso.c | 11 | ||||
-rw-r--r-- | drivers/firewire/core.h | 87 | ||||
-rw-r--r-- | drivers/firewire/net.c | 1655 |
6 files changed, 1714 insertions, 123 deletions
diff --git a/drivers/firewire/Kconfig b/drivers/firewire/Kconfig index 450902438208..13efcd362072 100644 --- a/drivers/firewire/Kconfig +++ b/drivers/firewire/Kconfig @@ -1,28 +1,29 @@ -comment "A new alternative FireWire stack is available with EXPERIMENTAL=y" - depends on EXPERIMENTAL=n - -comment "Enable only one of the two stacks, unless you know what you are doing" - depends on EXPERIMENTAL +comment "You can enable one or both FireWire driver stacks." +comment "See the help texts for more information." config FIREWIRE - tristate "New FireWire stack, EXPERIMENTAL" - depends on EXPERIMENTAL + tristate "FireWire driver stack" select CRC_ITU_T help - This is the "Juju" FireWire stack, a new alternative implementation - designed for robustness and simplicity. You can build either this - stack, or the old stack (the ieee1394 driver, ohci1394 etc.) or both. - Please read http://ieee1394.wiki.kernel.org/index.php/Juju_Migration - before you enable the new stack. + This is the new-generation IEEE 1394 (FireWire) driver stack + a.k.a. Juju, a new implementation designed for robustness and + simplicity. + See http://ieee1394.wiki.kernel.org/index.php/Juju_Migration + for information about migration from the older Linux 1394 stack + to the new driver stack. To compile this driver as a module, say M here: the module will be called firewire-core. This module functionally replaces ieee1394, raw1394, and video1394. To access it from application programs, you generally need at least - libraw1394 version 2. IIDC/DCAM applications also need libdc1394 - version 2. No libraries are required to access storage devices - through the firewire-sbp2 driver. + libraw1394 v2. IIDC/DCAM applications need libdc1394 v2. + No libraries are required to access storage devices through the + firewire-sbp2 driver. + + NOTE: + FireWire audio devices currently require the old drivers (ieee1394, + ohci1394, raw1394). config FIREWIRE_OHCI tristate "OHCI-1394 controllers" @@ -37,11 +38,9 @@ config FIREWIRE_OHCI stack. NOTE: - - You should only build either firewire-ohci or the old ohci1394 driver, - but not both. If you nevertheless want to install both, you should - configure them only as modules and blacklist the driver(s) which you - don't want to have auto-loaded. Add either + If you want to install firewire-ohci and ohci1394 together, you + should configure them only as modules and blacklist the driver(s) + which you don't want to have auto-loaded. Add either blacklist firewire-ohci or @@ -50,12 +49,7 @@ config FIREWIRE_OHCI blacklist dv1394 to /etc/modprobe.conf or /etc/modprobe.d/* and update modprobe.conf - depending on your distribution. The latter two modules should be - blacklisted together with ohci1394 because they depend on ohci1394. - - If you have an old modprobe which doesn't implement the blacklist - directive, use "install modulename /bin/true" for the modules to be - blacklisted. + depending on your distribution. config FIREWIRE_OHCI_DEBUG bool @@ -77,3 +71,17 @@ config FIREWIRE_SBP2 You should also enable support for disks, CD-ROMs, etc. in the SCSI configuration section. + +config FIREWIRE_NET + tristate "IP networking over 1394 (EXPERIMENTAL)" + depends on FIREWIRE && INET && EXPERIMENTAL + help + This enables IPv4 over IEEE 1394, providing IP connectivity with + other implementations of RFC 2734 as found on several operating + systems. Multicast support is currently limited. + + NOTE, this driver is not stable yet! + + To compile this driver as a module, say M here: The module will be + called firewire-net. It replaces eth1394 of the classic IEEE 1394 + stack. diff --git a/drivers/firewire/Makefile b/drivers/firewire/Makefile index bc3b9bf822bf..a8f9bb6d9fdf 100644 --- a/drivers/firewire/Makefile +++ b/drivers/firewire/Makefile @@ -6,7 +6,9 @@ firewire-core-y += core-card.o core-cdev.o core-device.o \ core-iso.o core-topology.o core-transaction.o firewire-ohci-y += ohci.o firewire-sbp2-y += sbp2.o +firewire-net-y += net.o -obj-$(CONFIG_FIREWIRE) += firewire-core.o +obj-$(CONFIG_FIREWIRE) += firewire-core.o obj-$(CONFIG_FIREWIRE_OHCI) += firewire-ohci.o obj-$(CONFIG_FIREWIRE_SBP2) += firewire-sbp2.o +obj-$(CONFIG_FIREWIRE_NET) += firewire-net.o diff --git a/drivers/firewire/core-card.c b/drivers/firewire/core-card.c index 4c1be64fdddd..543fccac81bb 100644 --- a/drivers/firewire/core-card.c +++ b/drivers/firewire/core-card.c @@ -176,6 +176,7 @@ int fw_core_add_descriptor(struct fw_descriptor *desc) return 0; } +EXPORT_SYMBOL(fw_core_add_descriptor); void fw_core_remove_descriptor(struct fw_descriptor *desc) { @@ -189,6 +190,7 @@ void fw_core_remove_descriptor(struct fw_descriptor *desc) mutex_unlock(&card_mutex); } +EXPORT_SYMBOL(fw_core_remove_descriptor); static void allocate_broadcast_channel(struct fw_card *card, int generation) { @@ -459,11 +461,11 @@ EXPORT_SYMBOL(fw_card_add); /* - * The next few functions implements a dummy driver that use once a - * card driver shuts down an fw_card. This allows the driver to - * cleanly unload, as all IO to the card will be handled by the dummy - * driver instead of calling into the (possibly) unloaded module. The - * dummy driver just fails all IO. + * The next few functions implement a dummy driver that is used once a card + * driver shuts down an fw_card. This allows the driver to cleanly unload, + * as all IO to the card will be handled (and failed) by the dummy driver + * instead of calling into the module. Only functions for iso context + * shutdown still need to be provided by the card driver. */ static int dummy_enable(struct fw_card *card, u32 *config_rom, size_t length) @@ -510,7 +512,7 @@ static int dummy_enable_phys_dma(struct fw_card *card, return -ENODEV; } -static struct fw_card_driver dummy_driver = { +static const struct fw_card_driver dummy_driver_template = { .enable = dummy_enable, .update_phy_reg = dummy_update_phy_reg, .set_config_rom = dummy_set_config_rom, @@ -529,6 +531,8 @@ void fw_card_release(struct kref *kref) void fw_core_remove_card(struct fw_card *card) { + struct fw_card_driver dummy_driver = dummy_driver_template; + card->driver->update_phy_reg(card, 4, PHY_LINK_ACTIVE | PHY_CONTENDER, 0); fw_core_initiate_bus_reset(card, 1); @@ -537,7 +541,9 @@ void fw_core_remove_card(struct fw_card *card) list_del_init(&card->link); mutex_unlock(&card_mutex); - /* Set up the dummy driver. */ + /* Switch off most of the card driver interface. */ + dummy_driver.free_iso_context = card->driver->free_iso_context; + dummy_driver.stop_iso = card->driver->stop_iso; card->driver = &dummy_driver; fw_destroy_nodes(card); diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c index 28076c892d7e..166f19c6d38d 100644 --- a/drivers/firewire/core-iso.c +++ b/drivers/firewire/core-iso.c @@ -71,7 +71,7 @@ int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card, for (j = 0; j < i; j++) { address = page_private(buffer->pages[j]); dma_unmap_page(card->device, address, - PAGE_SIZE, DMA_TO_DEVICE); + PAGE_SIZE, direction); __free_page(buffer->pages[j]); } kfree(buffer->pages); @@ -80,6 +80,7 @@ int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card, return -ENOMEM; } +EXPORT_SYMBOL(fw_iso_buffer_init); int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma) { @@ -107,13 +108,14 @@ void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, for (i = 0; i < buffer->page_count; i++) { address = page_private(buffer->pages[i]); dma_unmap_page(card->device, address, - PAGE_SIZE, DMA_TO_DEVICE); + PAGE_SIZE, buffer->direction); __free_page(buffer->pages[i]); } kfree(buffer->pages); buffer->pages = NULL; } +EXPORT_SYMBOL(fw_iso_buffer_destroy); struct fw_iso_context *fw_iso_context_create(struct fw_card *card, int type, int channel, int speed, size_t header_size, @@ -136,6 +138,7 @@ struct fw_iso_context *fw_iso_context_create(struct fw_card *card, return ctx; } +EXPORT_SYMBOL(fw_iso_context_create); void fw_iso_context_destroy(struct fw_iso_context *ctx) { @@ -143,12 +146,14 @@ void fw_iso_context_destroy(struct fw_iso_context *ctx) card->driver->free_iso_context(ctx); } +EXPORT_SYMBOL(fw_iso_context_destroy); int fw_iso_context_start(struct fw_iso_context *ctx, int cycle, int sync, int tags) { return ctx->card->driver->start_iso(ctx, cycle, sync, tags); } +EXPORT_SYMBOL(fw_iso_context_start); int fw_iso_context_queue(struct fw_iso_context *ctx, struct fw_iso_packet *packet, @@ -159,11 +164,13 @@ int fw_iso_context_queue(struct fw_iso_context *ctx, return card->driver->queue_iso(ctx, packet, buffer, payload); } +EXPORT_SYMBOL(fw_iso_context_queue); int fw_iso_context_stop(struct fw_iso_context *ctx) { return ctx->card->driver->stop_iso(ctx); } +EXPORT_SYMBOL(fw_iso_context_stop); /* * Isochronous bus resource management (channels, bandwidth), client side diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h index 0a25a7b38a80..c3cfc647e5e3 100644 --- a/drivers/firewire/core.h +++ b/drivers/firewire/core.h @@ -1,7 +1,6 @@ #ifndef _FIREWIRE_CORE_H #define _FIREWIRE_CORE_H -#include <linux/dma-mapping.h> #include <linux/fs.h> #include <linux/list.h> #include <linux/idr.h> @@ -97,17 +96,6 @@ int fw_core_initiate_bus_reset(struct fw_card *card, int short_reset); int fw_compute_block_crc(u32 *block); void fw_schedule_bm_work(struct fw_card *card, unsigned long delay); -struct fw_descriptor { - struct list_head link; - size_t length; - u32 immediate; - u32 key; - const u32 *data; -}; - -int fw_core_add_descriptor(struct fw_descriptor *desc); -void fw_core_remove_descriptor(struct fw_descriptor *desc); - /* -cdev */ @@ -130,77 +118,7 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event); /* -iso */ -/* - * The iso packet format allows for an immediate header/payload part - * stored in 'header' immediately after the packet info plus an - * indirect payload part that is pointer to by the 'payload' field. - * Applications can use one or the other or both to implement simple - * low-bandwidth streaming (e.g. audio) or more advanced - * scatter-gather streaming (e.g. assembling video frame automatically). - */ -struct fw_iso_packet { - u16 payload_length; /* Length of indirect payload. */ - u32 interrupt:1; /* Generate interrupt on this packet */ - u32 skip:1; /* Set to not send packet at all. */ - u32 tag:2; - u32 sy:4; - u32 header_length:8; /* Length of immediate header. */ - u32 header[0]; -}; - -#define FW_ISO_CONTEXT_TRANSMIT 0 -#define FW_ISO_CONTEXT_RECEIVE 1 - -#define FW_ISO_CONTEXT_MATCH_TAG0 1 -#define FW_ISO_CONTEXT_MATCH_TAG1 2 -#define FW_ISO_CONTEXT_MATCH_TAG2 4 -#define FW_ISO_CONTEXT_MATCH_TAG3 8 -#define FW_ISO_CONTEXT_MATCH_ALL_TAGS 15 - -/* - * An iso buffer is just a set of pages mapped for DMA in the - * specified direction. Since the pages are to be used for DMA, they - * are not mapped into the kernel virtual address space. We store the - * DMA address in the page private. The helper function - * fw_iso_buffer_map() will map the pages into a given vma. - */ -struct fw_iso_buffer { - enum dma_data_direction direction; - struct page **pages; - int page_count; -}; - -typedef void (*fw_iso_callback_t)(struct fw_iso_context *context, - u32 cycle, size_t header_length, - void *header, void *data); - -struct fw_iso_context { - struct fw_card *card; - int type; - int channel; - int speed; - size_t header_size; - fw_iso_callback_t callback; - void *callback_data; -}; - -int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card, - int page_count, enum dma_data_direction direction); int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma); -void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card); - -struct fw_iso_context *fw_iso_context_create(struct fw_card *card, - int type, int channel, int speed, size_t header_size, - fw_iso_callback_t callback, void *callback_data); -int fw_iso_context_queue(struct fw_iso_context *ctx, - struct fw_iso_packet *packet, - struct fw_iso_buffer *buffer, - unsigned long payload); -int fw_iso_context_start(struct fw_iso_context *ctx, - int cycle, int sync, int tags); -int fw_iso_context_stop(struct fw_iso_context *ctx); -void fw_iso_context_destroy(struct fw_iso_context *ctx); - void fw_iso_resource_manage(struct fw_card *card, int generation, u64 channels_mask, int *channel, int *bandwidth, bool allocate); @@ -285,9 +203,4 @@ void fw_flush_transactions(struct fw_card *card); void fw_send_phy_config(struct fw_card *card, int node_id, int generation, int gap_count); -static inline int fw_stream_packet_destination_id(int tag, int channel, int sy) -{ - return tag << 14 | channel << 8 | sy; -} - #endif /* _FIREWIRE_CORE_H */ diff --git a/drivers/firewire/net.c b/drivers/firewire/net.c new file mode 100644 index 000000000000..a42209a73aed --- /dev/null +++ b/drivers/firewire/net.c @@ -0,0 +1,1655 @@ +/* + * IPv4 over IEEE 1394, per RFC 2734 + * + * Copyright (C) 2009 Jay Fenlason <fenlason@redhat.com> + * + * based on eth1394 by Ben Collins et al + */ + +#include <linux/bug.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/spinlock.h> + +#include <asm/unaligned.h> +#include <net/arp.h> + +#define FWNET_MAX_FRAGMENTS 25 /* arbitrary limit */ +#define FWNET_ISO_PAGE_COUNT (PAGE_SIZE < 16 * 1024 ? 4 : 2) + +#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 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 */ + +#define RFC2734_HW_ADDR_LEN 16 + +struct rfc2734_arp { + __be16 hw_type; /* 0x0018 */ + __be16 proto_type; /* 0x0806 */ + u8 hw_addr_len; /* 16 */ + u8 ip_addr_len; /* 4 */ + __be16 opcode; /* ARP Opcode */ + /* Above is exactly the same format as struct arphdr */ + + __be64 s_uniq_id; /* Sender's 64bit EUI */ + u8 max_rec; /* Sender's max packet size */ + u8 sspd; /* Sender's max speed */ + __be16 fifo_hi; /* hi 16bits of sender's FIFO addr */ + __be32 fifo_lo; /* lo 32bits of sender's FIFO addr */ + __be32 sip; /* Sender's IP Address */ + __be32 tip; /* IP Address of requested hw addr */ +} __attribute__((packed)); + +/* This header format is specific to this driver implementation. */ +#define FWNET_ALEN 8 +#define FWNET_HLEN 10 +struct fwnet_header { + u8 h_dest[FWNET_ALEN]; /* destination address */ + __be16 h_proto; /* packet type ID field */ +} __attribute__((packed)); + +/* 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) +#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) << 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; + + /* List of packets to be sent */ + struct list_head packet_list; + /* + * List of packets that were broadcasted. When we get an ISO interrupt + * one of them has been sent + */ + struct list_head broadcasted_list; + /* List of packets that have been sent but not yet acked */ + struct list_head sent_list; + + 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; + u64 fifo; + + /* guarded by dev->lock */ + struct list_head pd_list; /* received partial datagrams */ + unsigned pdg_size; /* pd_list size */ + + u16 datagram_label; /* outgoing datagram label */ + unsigned 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 { + /* + * ptask can actually be on dev->packet_list, dev->broadcasted_list, + * or dev->sent_list depending on its current state. + */ + struct list_head pt_link; + struct fw_transaction transaction; + struct rfc2734_header hdr; + struct sk_buff *skb; + struct fwnet_device *dev; + + int outstanding_pkts; + unsigned max_payload; + u64 fifo_addr; + u16 dest_node; + u8 generation; + u8 speed; +}; + +/* + * 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 = (struct fwnet_header *)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_rebuild(struct sk_buff *skb) +{ + struct fwnet_header *h = (struct fwnet_header *)skb->data; + + if (get_unaligned_be16(&h->h_proto) == ETH_P_IP) + return arp_find((unsigned char *)&h->h_dest, skb); + + fw_notify("%s: unable to resolve type %04x addresses\n", + skb->dev->name, be16_to_cpu(h->h_proto)); + return 0; +} + +static int fwnet_header_cache(const struct neighbour *neigh, + struct hh_cache *hh) +{ + struct net_device *net; + struct fwnet_header *h; + + if (hh->hh_type == cpu_to_be16(ETH_P_802_3)) + return -1; + net = neigh->dev; + h = (struct fwnet_header *)((u8 *)hh->hh_data + 16 - sizeof(*h)); + h->h_proto = hh->hh_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 + 16 - 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, + .rebuild = fwnet_header_rebuild, + .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) { + fw_error("out of memory\n"); + 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 + net->hard_header_len + 15); + if (new->skb == NULL) + goto fail_w_fi; + + skb_reserve(new->skb, (net->hard_header_len + 15) & ~15); + 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: + fw_error("out of memory\n"); + + 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 beginnig 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 = min(max_rec, 0xbU); /* <= 4096 */ + if (max_rec < 8) { + fw_notify("max_rec %x out of range\n", max_rec); + max_rec = 8; + } + + 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; + static const __be64 broadcast_hw = cpu_to_be64(~0ULL); + int status; + __be64 guid; + + dev = netdev_priv(net); + /* Write metadata, and then pass to the receive level */ + skb->dev = net; + skb->ip_summed = CHECKSUM_UNNECESSARY; /* don't check it */ + + /* + * Parse the encapsulation header. This actually does the job of + * converting to an ethernet frame header, as well as arp + * conversion if needed. ARP conversion is easier in this + * direction, since we are using ethernet as our backend. + */ + /* + * If this is an ARP packet, convert it. First, we want to make + * use of some of the fields, since they tell us a little bit + * about the sending machine. + */ + if (ether_type == ETH_P_ARP) { + struct rfc2734_arp *arp1394; + struct arphdr *arp; + unsigned char *arp_ptr; + u64 fifo_addr; + u64 peer_guid; + unsigned sspd; + u16 max_payload; + struct fwnet_peer *peer; + unsigned long flags; + + arp1394 = (struct rfc2734_arp *)skb->data; + arp = (struct arphdr *)skb->data; + arp_ptr = (unsigned char *)(arp + 1); + peer_guid = get_unaligned_be64(&arp1394->s_uniq_id); + fifo_addr = (u64)get_unaligned_be16(&arp1394->fifo_hi) << 32 + | get_unaligned_be32(&arp1394->fifo_lo); + + sspd = arp1394->sspd; + /* Sanity check. OS X 10.3 PPC reportedly sends 131. */ + if (sspd > SCODE_3200) { + fw_notify("sspd %x out of range\n", sspd); + sspd = SCODE_3200; + } + max_payload = fwnet_max_payload(arp1394->max_rec, sspd); + + spin_lock_irqsave(&dev->lock, flags); + peer = fwnet_peer_find_by_guid(dev, peer_guid); + if (peer) { + peer->fifo = fifo_addr; + + if (peer->speed > sspd) + peer->speed = sspd; + if (peer->max_payload > max_payload) + peer->max_payload = max_payload; + } + spin_unlock_irqrestore(&dev->lock, flags); + + if (!peer) { + fw_notify("No peer for ARP packet from %016llx\n", + (unsigned long long)peer_guid); + goto failed_proto; + } + + /* + * Now that we're done with the 1394 specific stuff, we'll + * need to alter some of the data. Believe it or not, all + * that needs to be done is sender_IP_address needs to be + * moved, the destination hardware address get stuffed + * in and the hardware address length set to 8. + * + * IMPORTANT: The code below overwrites 1394 specific data + * needed above so keep the munging of the data for the + * higher level IP stack last. + */ + + arp->ar_hln = 8; + /* skip over sender unique id */ + arp_ptr += arp->ar_hln; + /* move sender IP addr */ + put_unaligned(arp1394->sip, (u32 *)arp_ptr); + /* skip over sender IP addr */ + arp_ptr += arp->ar_pln; + + if (arp->ar_op == htons(ARPOP_REQUEST)) + memset(arp_ptr, 0, sizeof(u64)); + else + memcpy(arp_ptr, net->dev_addr, sizeof(u64)); + } + + /* Now add the ethernet header. */ + guid = cpu_to_be64(dev->card->guid); + if (dev_hard_header(skb, net, ether_type, + is_broadcast ? &broadcast_hw : &guid, + 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 (*eth->h_dest & 1) { + 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) >= 1536) { + 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; + } + if (netif_queue_stopped(net)) + netif_wake_queue(net); + + return 0; + + failed_proto: + net->stats.rx_errors++; + net->stats.rx_dropped++; + + dev_kfree_skb_any(skb); + if (netif_queue_stopped(net)) + netif_wake_queue(net); + + net->last_rx = jiffies; |