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![Isaku Yamahata](/assets/img/avatar_default.png)
The change set of 27a884dc
, "[SK_BUFF]: Convert skb->tail to sk_buff_data_t"
converted skb->tail from pointer into sk_buff_data_t. It missed skb->tail
in drivers/atm/ambassador.c.
This patch converts skb->tail into skb_tail_pointer(skb).
Found by inspection. Compile tested only.
Cc: Simon Horman <horms@verge.net.au>
Cc: Chas Williams <chas@cmf.nrl.navy.mil>
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2422 lines
66 KiB
C
2422 lines
66 KiB
C
/*
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Madge Ambassador ATM Adapter driver.
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Copyright (C) 1995-1999 Madge Networks Ltd.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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The GNU GPL is contained in /usr/doc/copyright/GPL on a Debian
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system and in the file COPYING in the Linux kernel source.
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*/
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/* * dedicated to the memory of Graham Gordon 1971-1998 * */
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/atmdev.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/poison.h>
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#include <linux/bitrev.h>
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#include <linux/mutex.h>
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#include <linux/firmware.h>
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#include <linux/ihex.h>
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#include <linux/slab.h>
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#include <linux/atomic.h>
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#include <asm/io.h>
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#include <asm/byteorder.h>
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#include "ambassador.h"
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#define maintainer_string "Giuliano Procida at Madge Networks <gprocida@madge.com>"
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#define description_string "Madge ATM Ambassador driver"
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#define version_string "1.2.4"
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static inline void __init show_version (void) {
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printk ("%s version %s\n", description_string, version_string);
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}
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/*
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Theory of Operation
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I Hardware, detection, initialisation and shutdown.
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1. Supported Hardware
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This driver is for the PCI ATMizer-based Ambassador card (except
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very early versions). It is not suitable for the similar EISA "TR7"
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card. Commercially, both cards are known as Collage Server ATM
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adapters.
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The loader supports image transfer to the card, image start and few
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other miscellaneous commands.
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Only AAL5 is supported with vpi = 0 and vci in the range 0 to 1023.
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The cards are big-endian.
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2. Detection
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Standard PCI stuff, the early cards are detected and rejected.
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3. Initialisation
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The cards are reset and the self-test results are checked. The
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microcode image is then transferred and started. This waits for a
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pointer to a descriptor containing details of the host-based queues
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and buffers and various parameters etc. Once they are processed
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normal operations may begin. The BIA is read using a microcode
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command.
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4. Shutdown
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This may be accomplished either by a card reset or via the microcode
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shutdown command. Further investigation required.
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5. Persistent state
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The card reset does not affect PCI configuration (good) or the
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contents of several other "shared run-time registers" (bad) which
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include doorbell and interrupt control as well as EEPROM and PCI
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control. The driver must be careful when modifying these registers
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not to touch bits it does not use and to undo any changes at exit.
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II Driver software
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0. Generalities
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The adapter is quite intelligent (fast) and has a simple interface
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(few features). VPI is always zero, 1024 VCIs are supported. There
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is limited cell rate support. UBR channels can be capped and ABR
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(explicit rate, but not EFCI) is supported. There is no CBR or VBR
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support.
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1. Driver <-> Adapter Communication
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Apart from the basic loader commands, the driver communicates
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through three entities: the command queue (CQ), the transmit queue
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pair (TXQ) and the receive queue pairs (RXQ). These three entities
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are set up by the host and passed to the microcode just after it has
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been started.
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All queues are host-based circular queues. They are contiguous and
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(due to hardware limitations) have some restrictions as to their
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locations in (bus) memory. They are of the "full means the same as
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empty so don't do that" variety since the adapter uses pointers
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internally.
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The queue pairs work as follows: one queue is for supply to the
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adapter, items in it are pending and are owned by the adapter; the
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other is the queue for return from the adapter, items in it have
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been dealt with by the adapter. The host adds items to the supply
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(TX descriptors and free RX buffer descriptors) and removes items
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from the return (TX and RX completions). The adapter deals with out
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of order completions.
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Interrupts (card to host) and the doorbell (host to card) are used
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for signalling.
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1. CQ
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This is to communicate "open VC", "close VC", "get stats" etc. to
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the adapter. At most one command is retired every millisecond by the
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card. There is no out of order completion or notification. The
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driver needs to check the return code of the command, waiting as
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appropriate.
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2. TXQ
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TX supply items are of variable length (scatter gather support) and
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so the queue items are (more or less) pointers to the real thing.
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Each TX supply item contains a unique, host-supplied handle (the skb
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bus address seems most sensible as this works for Alphas as well,
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there is no need to do any endian conversions on the handles).
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TX return items consist of just the handles above.
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3. RXQ (up to 4 of these with different lengths and buffer sizes)
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RX supply items consist of a unique, host-supplied handle (the skb
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bus address again) and a pointer to the buffer data area.
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RX return items consist of the handle above, the VC, length and a
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status word. This just screams "oh so easy" doesn't it?
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Note on RX pool sizes:
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Each pool should have enough buffers to handle a back-to-back stream
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of minimum sized frames on a single VC. For example:
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frame spacing = 3us (about right)
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delay = IRQ lat + RX handling + RX buffer replenish = 20 (us) (a guess)
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min number of buffers for one VC = 1 + delay/spacing (buffers)
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delay/spacing = latency = (20+2)/3 = 7 (buffers) (rounding up)
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The 20us delay assumes that there is no need to sleep; if we need to
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sleep to get buffers we are going to drop frames anyway.
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In fact, each pool should have enough buffers to support the
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simultaneous reassembly of a separate frame on each VC and cope with
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the case in which frames complete in round robin cell fashion on
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each VC.
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Only one frame can complete at each cell arrival, so if "n" VCs are
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open, the worst case is to have them all complete frames together
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followed by all starting new frames together.
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desired number of buffers = n + delay/spacing
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These are the extreme requirements, however, they are "n+k" for some
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"k" so we have only the constant to choose. This is the argument
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rx_lats which current defaults to 7.
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Actually, "n ? n+k : 0" is better and this is what is implemented,
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subject to the limit given by the pool size.
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4. Driver locking
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Simple spinlocks are used around the TX and RX queue mechanisms.
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Anyone with a faster, working method is welcome to implement it.
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The adapter command queue is protected with a spinlock. We always
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wait for commands to complete.
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A more complex form of locking is used around parts of the VC open
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and close functions. There are three reasons for a lock: 1. we need
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to do atomic rate reservation and release (not used yet), 2. Opening
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sometimes involves two adapter commands which must not be separated
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by another command on the same VC, 3. the changes to RX pool size
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must be atomic. The lock needs to work over context switches, so we
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use a semaphore.
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III Hardware Features and Microcode Bugs
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1. Byte Ordering
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*%^"$&%^$*&^"$(%^$#&^%$(&#%$*(&^#%!"!"!*!
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2. Memory access
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All structures that are not accessed using DMA must be 4-byte
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aligned (not a problem) and must not cross 4MB boundaries.
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There is a DMA memory hole at E0000000-E00000FF (groan).
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TX fragments (DMA read) must not cross 4MB boundaries (would be 16MB
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but for a hardware bug).
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RX buffers (DMA write) must not cross 16MB boundaries and must
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include spare trailing bytes up to the next 4-byte boundary; they
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will be written with rubbish.
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The PLX likes to prefetch; if reading up to 4 u32 past the end of
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each TX fragment is not a problem, then TX can be made to go a
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little faster by passing a flag at init that disables a prefetch
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workaround. We do not pass this flag. (new microcode only)
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Now we:
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. Note that alloc_skb rounds up size to a 16byte boundary.
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. Ensure all areas do not traverse 4MB boundaries.
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. Ensure all areas do not start at a E00000xx bus address.
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(I cannot be certain, but this may always hold with Linux)
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. Make all failures cause a loud message.
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. Discard non-conforming SKBs (causes TX failure or RX fill delay).
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. Discard non-conforming TX fragment descriptors (the TX fails).
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In the future we could:
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. Allow RX areas that traverse 4MB (but not 16MB) boundaries.
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. Segment TX areas into some/more fragments, when necessary.
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. Relax checks for non-DMA items (ignore hole).
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. Give scatter-gather (iovec) requirements using ???. (?)
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3. VC close is broken (only for new microcode)
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The VC close adapter microcode command fails to do anything if any
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frames have been received on the VC but none have been transmitted.
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Frames continue to be reassembled and passed (with IRQ) to the
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driver.
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IV To Do List
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. Fix bugs!
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. Timer code may be broken.
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. Deal with buggy VC close (somehow) in microcode 12.
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. Handle interrupted and/or non-blocking writes - is this a job for
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the protocol layer?
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. Add code to break up TX fragments when they span 4MB boundaries.
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. Add SUNI phy layer (need to know where SUNI lives on card).
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. Implement a tx_alloc fn to (a) satisfy TX alignment etc. and (b)
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leave extra headroom space for Ambassador TX descriptors.
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. Understand these elements of struct atm_vcc: recvq (proto?),
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sleep, callback, listenq, backlog_quota, reply and user_back.
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. Adjust TX/RX skb allocation to favour IP with LANE/CLIP (configurable).
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. Impose a TX-pending limit (2?) on each VC, help avoid TX q overflow.
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. Decide whether RX buffer recycling is or can be made completely safe;
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turn it back on. It looks like Werner is going to axe this.
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. Implement QoS changes on open VCs (involves extracting parts of VC open
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and close into separate functions and using them to make changes).
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. Hack on command queue so that someone can issue multiple commands and wait
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on the last one (OR only "no-op" or "wait" commands are waited for).
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. Eliminate need for while-schedule around do_command.
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*/
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static void do_housekeeping (unsigned long arg);
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/********** globals **********/
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static unsigned short debug = 0;
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static unsigned int cmds = 8;
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static unsigned int txs = 32;
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static unsigned int rxs[NUM_RX_POOLS] = { 64, 64, 64, 64 };
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static unsigned int rxs_bs[NUM_RX_POOLS] = { 4080, 12240, 36720, 65535 };
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static unsigned int rx_lats = 7;
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static unsigned char pci_lat = 0;
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static const unsigned long onegigmask = -1 << 30;
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/********** access to adapter **********/
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static inline void wr_plain (const amb_dev * dev, size_t addr, u32 data) {
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PRINTD (DBG_FLOW|DBG_REGS, "wr: %08zx <- %08x", addr, data);
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#ifdef AMB_MMIO
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dev->membase[addr / sizeof(u32)] = data;
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#else
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outl (data, dev->iobase + addr);
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#endif
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}
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static inline u32 rd_plain (const amb_dev * dev, size_t addr) {
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#ifdef AMB_MMIO
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u32 data = dev->membase[addr / sizeof(u32)];
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#else
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u32 data = inl (dev->iobase + addr);
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#endif
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PRINTD (DBG_FLOW|DBG_REGS, "rd: %08zx -> %08x", addr, data);
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return data;
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}
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static inline void wr_mem (const amb_dev * dev, size_t addr, u32 data) {
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__be32 be = cpu_to_be32 (data);
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PRINTD (DBG_FLOW|DBG_REGS, "wr: %08zx <- %08x b[%08x]", addr, data, be);
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#ifdef AMB_MMIO
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dev->membase[addr / sizeof(u32)] = be;
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#else
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outl (be, dev->iobase + addr);
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#endif
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}
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static inline u32 rd_mem (const amb_dev * dev, size_t addr) {
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#ifdef AMB_MMIO
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__be32 be = dev->membase[addr / sizeof(u32)];
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#else
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__be32 be = inl (dev->iobase + addr);
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#endif
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u32 data = be32_to_cpu (be);
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PRINTD (DBG_FLOW|DBG_REGS, "rd: %08zx -> %08x b[%08x]", addr, data, be);
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return data;
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}
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/********** dump routines **********/
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static inline void dump_registers (const amb_dev * dev) {
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#ifdef DEBUG_AMBASSADOR
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if (debug & DBG_REGS) {
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size_t i;
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PRINTD (DBG_REGS, "reading PLX control: ");
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for (i = 0x00; i < 0x30; i += sizeof(u32))
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rd_mem (dev, i);
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PRINTD (DBG_REGS, "reading mailboxes: ");
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for (i = 0x40; i < 0x60; i += sizeof(u32))
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rd_mem (dev, i);
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PRINTD (DBG_REGS, "reading doorb irqev irqen reset:");
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for (i = 0x60; i < 0x70; i += sizeof(u32))
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rd_mem (dev, i);
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}
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#else
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(void) dev;
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#endif
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return;
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}
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static inline void dump_loader_block (volatile loader_block * lb) {
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#ifdef DEBUG_AMBASSADOR
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unsigned int i;
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PRINTDB (DBG_LOAD, "lb @ %p; res: %d, cmd: %d, pay:",
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lb, be32_to_cpu (lb->result), be32_to_cpu (lb->command));
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for (i = 0; i < MAX_COMMAND_DATA; ++i)
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PRINTDM (DBG_LOAD, " %08x", be32_to_cpu (lb->payload.data[i]));
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PRINTDE (DBG_LOAD, ", vld: %08x", be32_to_cpu (lb->valid));
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#else
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(void) lb;
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#endif
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return;
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}
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static inline void dump_command (command * cmd) {
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#ifdef DEBUG_AMBASSADOR
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unsigned int i;
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PRINTDB (DBG_CMD, "cmd @ %p, req: %08x, pars:",
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cmd, /*be32_to_cpu*/ (cmd->request));
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for (i = 0; i < 3; ++i)
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PRINTDM (DBG_CMD, " %08x", /*be32_to_cpu*/ (cmd->args.par[i]));
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PRINTDE (DBG_CMD, "");
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#else
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(void) cmd;
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#endif
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return;
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}
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static inline void dump_skb (char * prefix, unsigned int vc, struct sk_buff * skb) {
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#ifdef DEBUG_AMBASSADOR
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unsigned int i;
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unsigned char * data = skb->data;
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PRINTDB (DBG_DATA, "%s(%u) ", prefix, vc);
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for (i=0; i<skb->len && i < 256;i++)
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PRINTDM (DBG_DATA, "%02x ", data[i]);
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PRINTDE (DBG_DATA,"");
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#else
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(void) prefix;
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(void) vc;
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(void) skb;
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#endif
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return;
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}
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/********** check memory areas for use by Ambassador **********/
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/* see limitations under Hardware Features */
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static int check_area (void * start, size_t length) {
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// assumes length > 0
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const u32 fourmegmask = -1 << 22;
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const u32 twofivesixmask = -1 << 8;
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const u32 starthole = 0xE0000000;
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u32 startaddress = virt_to_bus (start);
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u32 lastaddress = startaddress+length-1;
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if ((startaddress ^ lastaddress) & fourmegmask ||
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(startaddress & twofivesixmask) == starthole) {
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PRINTK (KERN_ERR, "check_area failure: [%x,%x] - mail maintainer!",
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startaddress, lastaddress);
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return -1;
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} else {
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return 0;
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}
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}
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/********** free an skb (as per ATM device driver documentation) **********/
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static void amb_kfree_skb (struct sk_buff * skb) {
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if (ATM_SKB(skb)->vcc->pop) {
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ATM_SKB(skb)->vcc->pop (ATM_SKB(skb)->vcc, skb);
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} else {
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dev_kfree_skb_any (skb);
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}
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}
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/********** TX completion **********/
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static void tx_complete (amb_dev * dev, tx_out * tx) {
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tx_simple * tx_descr = bus_to_virt (tx->handle);
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struct sk_buff * skb = tx_descr->skb;
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PRINTD (DBG_FLOW|DBG_TX, "tx_complete %p %p", dev, tx);
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// VC layer stats
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atomic_inc(&ATM_SKB(skb)->vcc->stats->tx);
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// free the descriptor
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kfree (tx_descr);
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// free the skb
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amb_kfree_skb (skb);
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dev->stats.tx_ok++;
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return;
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}
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/********** RX completion **********/
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static void rx_complete (amb_dev * dev, rx_out * rx) {
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struct sk_buff * skb = bus_to_virt (rx->handle);
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u16 vc = be16_to_cpu (rx->vc);
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// unused: u16 lec_id = be16_to_cpu (rx->lec_id);
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u16 status = be16_to_cpu (rx->status);
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u16 rx_len = be16_to_cpu (rx->length);
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PRINTD (DBG_FLOW|DBG_RX, "rx_complete %p %p (len=%hu)", dev, rx, rx_len);
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|
// XXX move this in and add to VC stats ???
|
|
if (!status) {
|
|
struct atm_vcc * atm_vcc = dev->rxer[vc];
|
|
dev->stats.rx.ok++;
|
|
|
|
if (atm_vcc) {
|
|
|
|
if (rx_len <= atm_vcc->qos.rxtp.max_sdu) {
|
|
|
|
if (atm_charge (atm_vcc, skb->truesize)) {
|
|
|
|
// prepare socket buffer
|
|
ATM_SKB(skb)->vcc = atm_vcc;
|
|
skb_put (skb, rx_len);
|
|
|
|
dump_skb ("<<<", vc, skb);
|
|
|
|
// VC layer stats
|
|
atomic_inc(&atm_vcc->stats->rx);
|
|
__net_timestamp(skb);
|
|
// end of our responsibility
|
|
atm_vcc->push (atm_vcc, skb);
|
|
return;
|
|
|
|
} else {
|
|
// someone fix this (message), please!
|
|
PRINTD (DBG_INFO|DBG_RX, "dropped thanks to atm_charge (vc %hu, truesize %u)", vc, skb->truesize);
|
|
// drop stats incremented in atm_charge
|
|
}
|
|
|
|
} else {
|
|
PRINTK (KERN_INFO, "dropped over-size frame");
|
|
// should we count this?
|
|
atomic_inc(&atm_vcc->stats->rx_drop);
|
|
}
|
|
|
|
} else {
|
|
PRINTD (DBG_WARN|DBG_RX, "got frame but RX closed for channel %hu", vc);
|
|
// this is an adapter bug, only in new version of microcode
|
|
}
|
|
|
|
} else {
|
|
dev->stats.rx.error++;
|
|
if (status & CRC_ERR)
|
|
dev->stats.rx.badcrc++;
|
|
if (status & LEN_ERR)
|
|
dev->stats.rx.toolong++;
|
|
if (status & ABORT_ERR)
|
|
dev->stats.rx.aborted++;
|
|
if (status & UNUSED_ERR)
|
|
dev->stats.rx.unused++;
|
|
}
|
|
|
|
dev_kfree_skb_any (skb);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
|
|
Note on queue handling.
|
|
|
|
Here "give" and "take" refer to queue entries and a queue (pair)
|
|
rather than frames to or from the host or adapter. Empty frame
|
|
buffers are given to the RX queue pair and returned unused or
|
|
containing RX frames. TX frames (well, pointers to TX fragment
|
|
lists) are given to the TX queue pair, completions are returned.
|
|
|
|
*/
|
|
|
|
/********** command queue **********/
|
|
|
|
// I really don't like this, but it's the best I can do at the moment
|
|
|
|
// also, the callers are responsible for byte order as the microcode
|
|
// sometimes does 16-bit accesses (yuk yuk yuk)
|
|
|
|
static int command_do (amb_dev * dev, command * cmd) {
|
|
amb_cq * cq = &dev->cq;
|
|
volatile amb_cq_ptrs * ptrs = &cq->ptrs;
|
|
command * my_slot;
|
|
|
|
PRINTD (DBG_FLOW|DBG_CMD, "command_do %p", dev);
|
|
|
|
if (test_bit (dead, &dev->flags))
|
|
return 0;
|
|
|
|
spin_lock (&cq->lock);
|
|
|
|
// if not full...
|
|
if (cq->pending < cq->maximum) {
|
|
// remember my slot for later
|
|
my_slot = ptrs->in;
|
|
PRINTD (DBG_CMD, "command in slot %p", my_slot);
|
|
|
|
dump_command (cmd);
|
|
|
|
// copy command in
|
|
*ptrs->in = *cmd;
|
|
cq->pending++;
|
|
ptrs->in = NEXTQ (ptrs->in, ptrs->start, ptrs->limit);
|
|
|
|
// mail the command
|
|
wr_mem (dev, offsetof(amb_mem, mb.adapter.cmd_address), virt_to_bus (ptrs->in));
|
|
|
|
if (cq->pending > cq->high)
|
|
cq->high = cq->pending;
|
|
spin_unlock (&cq->lock);
|
|
|
|
// these comments were in a while-loop before, msleep removes the loop
|
|
// go to sleep
|
|
// PRINTD (DBG_CMD, "wait: sleeping %lu for command", timeout);
|
|
msleep(cq->pending);
|
|
|
|
// wait for my slot to be reached (all waiters are here or above, until...)
|
|
while (ptrs->out != my_slot) {
|
|
PRINTD (DBG_CMD, "wait: command slot (now at %p)", ptrs->out);
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
schedule();
|
|
}
|
|
|
|
// wait on my slot (... one gets to its slot, and... )
|
|
while (ptrs->out->request != cpu_to_be32 (SRB_COMPLETE)) {
|
|
PRINTD (DBG_CMD, "wait: command slot completion");
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
schedule();
|
|
}
|
|
|
|
PRINTD (DBG_CMD, "command complete");
|
|
// update queue (... moves the queue along to the next slot)
|
|
spin_lock (&cq->lock);
|
|
cq->pending--;
|
|
// copy command out
|
|
*cmd = *ptrs->out;
|
|
ptrs->out = NEXTQ (ptrs->out, ptrs->start, ptrs->limit);
|
|
spin_unlock (&cq->lock);
|
|
|
|
return 0;
|
|
} else {
|
|
cq->filled++;
|
|
spin_unlock (&cq->lock);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
}
|
|
|
|
/********** TX queue pair **********/
|
|
|
|
static int tx_give (amb_dev * dev, tx_in * tx) {
|
|
amb_txq * txq = &dev->txq;
|
|
unsigned long flags;
|
|
|
|
PRINTD (DBG_FLOW|DBG_TX, "tx_give %p", dev);
|
|
|
|
if (test_bit (dead, &dev->flags))
|
|
return 0;
|
|
|
|
spin_lock_irqsave (&txq->lock, flags);
|
|
|
|
if (txq->pending < txq->maximum) {
|
|
PRINTD (DBG_TX, "TX in slot %p", txq->in.ptr);
|
|
|
|
*txq->in.ptr = *tx;
|
|
txq->pending++;
|
|
txq->in.ptr = NEXTQ (txq->in.ptr, txq->in.start, txq->in.limit);
|
|
// hand over the TX and ring the bell
|
|
wr_mem (dev, offsetof(amb_mem, mb.adapter.tx_address), virt_to_bus (txq->in.ptr));
|
|
wr_mem (dev, offsetof(amb_mem, doorbell), TX_FRAME);
|
|
|
|
if (txq->pending > txq->high)
|
|
txq->high = txq->pending;
|
|
spin_unlock_irqrestore (&txq->lock, flags);
|
|
return 0;
|
|
} else {
|
|
txq->filled++;
|
|
spin_unlock_irqrestore (&txq->lock, flags);
|
|
return -EAGAIN;
|
|
}
|
|
}
|
|
|
|
static int tx_take (amb_dev * dev) {
|
|
amb_txq * txq = &dev->txq;
|
|
unsigned long flags;
|
|
|
|
PRINTD (DBG_FLOW|DBG_TX, "tx_take %p", dev);
|
|
|
|
spin_lock_irqsave (&txq->lock, flags);
|
|
|
|
if (txq->pending && txq->out.ptr->handle) {
|
|
// deal with TX completion
|
|
tx_complete (dev, txq->out.ptr);
|
|
// mark unused again
|
|
txq->out.ptr->handle = 0;
|
|
// remove item
|
|
txq->pending--;
|
|
txq->out.ptr = NEXTQ (txq->out.ptr, txq->out.start, txq->out.limit);
|
|
|
|
spin_unlock_irqrestore (&txq->lock, flags);
|
|
return 0;
|
|
} else {
|
|
|
|
spin_unlock_irqrestore (&txq->lock, flags);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/********** RX queue pairs **********/
|
|
|
|
static int rx_give (amb_dev * dev, rx_in * rx, unsigned char pool) {
|
|
amb_rxq * rxq = &dev->rxq[pool];
|
|
unsigned long flags;
|
|
|
|
PRINTD (DBG_FLOW|DBG_RX, "rx_give %p[%hu]", dev, pool);
|
|
|
|
spin_lock_irqsave (&rxq->lock, flags);
|
|
|
|
if (rxq->pending < rxq->maximum) {
|
|
PRINTD (DBG_RX, "RX in slot %p", rxq->in.ptr);
|
|
|
|
*rxq->in.ptr = *rx;
|
|
rxq->pending++;
|
|
rxq->in.ptr = NEXTQ (rxq->in.ptr, rxq->in.start, rxq->in.limit);
|
|
// hand over the RX buffer
|
|
wr_mem (dev, offsetof(amb_mem, mb.adapter.rx_address[pool]), virt_to_bus (rxq->in.ptr));
|
|
|
|
spin_unlock_irqrestore (&rxq->lock, flags);
|
|
return 0;
|
|
} else {
|
|
spin_unlock_irqrestore (&rxq->lock, flags);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
static int rx_take (amb_dev * dev, unsigned char pool) {
|
|
amb_rxq * rxq = &dev->rxq[pool];
|
|
unsigned long flags;
|
|
|
|
PRINTD (DBG_FLOW|DBG_RX, "rx_take %p[%hu]", dev, pool);
|
|
|
|
spin_lock_irqsave (&rxq->lock, flags);
|
|
|
|
if (rxq->pending && (rxq->out.ptr->status || rxq->out.ptr->length)) {
|
|
// deal with RX completion
|
|
rx_complete (dev, rxq->out.ptr);
|
|
// mark unused again
|
|
rxq->out.ptr->status = 0;
|
|
rxq->out.ptr->length = 0;
|
|
// remove item
|
|
rxq->pending--;
|
|
rxq->out.ptr = NEXTQ (rxq->out.ptr, rxq->out.start, rxq->out.limit);
|
|
|
|
if (rxq->pending < rxq->low)
|
|
rxq->low = rxq->pending;
|
|
spin_unlock_irqrestore (&rxq->lock, flags);
|
|
return 0;
|
|
} else {
|
|
if (!rxq->pending && rxq->buffers_wanted)
|
|
rxq->emptied++;
|
|
spin_unlock_irqrestore (&rxq->lock, flags);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/********** RX Pool handling **********/
|
|
|
|
/* pre: buffers_wanted = 0, post: pending = 0 */
|
|
static void drain_rx_pool (amb_dev * dev, unsigned char pool) {
|
|
amb_rxq * rxq = &dev->rxq[pool];
|
|
|
|
PRINTD (DBG_FLOW|DBG_POOL, "drain_rx_pool %p %hu", dev, pool);
|
|
|
|
if (test_bit (dead, &dev->flags))
|
|
return;
|
|
|
|
/* we are not quite like the fill pool routines as we cannot just
|
|
remove one buffer, we have to remove all of them, but we might as
|
|
well pretend... */
|
|
if (rxq->pending > rxq->buffers_wanted) {
|
|
command cmd;
|
|
cmd.request = cpu_to_be32 (SRB_FLUSH_BUFFER_Q);
|
|
cmd.args.flush.flags = cpu_to_be32 (pool << SRB_POOL_SHIFT);
|
|
while (command_do (dev, &cmd))
|
|
schedule();
|
|
/* the pool may also be emptied via the interrupt handler */
|
|
while (rxq->pending > rxq->buffers_wanted)
|
|
if (rx_take (dev, pool))
|
|
schedule();
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
static void drain_rx_pools (amb_dev * dev) {
|
|
unsigned char pool;
|
|
|
|
PRINTD (DBG_FLOW|DBG_POOL, "drain_rx_pools %p", dev);
|
|
|
|
for (pool = 0; pool < NUM_RX_POOLS; ++pool)
|
|
drain_rx_pool (dev, pool);
|
|
}
|
|
|
|
static void fill_rx_pool (amb_dev * dev, unsigned char pool,
|
|
gfp_t priority)
|
|
{
|
|
rx_in rx;
|
|
amb_rxq * rxq;
|
|
|
|
PRINTD (DBG_FLOW|DBG_POOL, "fill_rx_pool %p %hu %x", dev, pool, priority);
|
|
|
|
if (test_bit (dead, &dev->flags))
|
|
return;
|
|
|
|
rxq = &dev->rxq[pool];
|
|
while (rxq->pending < rxq->maximum && rxq->pending < rxq->buffers_wanted) {
|
|
|
|
struct sk_buff * skb = alloc_skb (rxq->buffer_size, priority);
|
|
if (!skb) {
|
|
PRINTD (DBG_SKB|DBG_POOL, "failed to allocate skb for RX pool %hu", pool);
|
|
return;
|
|
}
|
|
if (check_area (skb->data, skb->truesize)) {
|
|
dev_kfree_skb_any (skb);
|
|
return;
|
|
}
|
|
// cast needed as there is no %? for pointer differences
|
|
PRINTD (DBG_SKB, "allocated skb at %p, head %p, area %li",
|
|
skb, skb->head, (long) skb_end_offset(skb));
|
|
rx.handle = virt_to_bus (skb);
|
|
rx.host_address = cpu_to_be32 (virt_to_bus (skb->data));
|
|
if (rx_give (dev, &rx, pool))
|
|
dev_kfree_skb_any (skb);
|
|
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
// top up all RX pools
|
|
static void fill_rx_pools (amb_dev * dev) {
|
|
unsigned char pool;
|
|
|
|
PRINTD (DBG_FLOW|DBG_POOL, "fill_rx_pools %p", dev);
|
|
|
|
for (pool = 0; pool < NUM_RX_POOLS; ++pool)
|
|
fill_rx_pool (dev, pool, GFP_ATOMIC);
|
|
|
|
return;
|
|
}
|
|
|
|
/********** enable host interrupts **********/
|
|
|
|
static void interrupts_on (amb_dev * dev) {
|
|
wr_plain (dev, offsetof(amb_mem, interrupt_control),
|
|
rd_plain (dev, offsetof(amb_mem, interrupt_control))
|
|
| AMB_INTERRUPT_BITS);
|
|
}
|
|
|
|
/********** disable host interrupts **********/
|
|
|
|
static void interrupts_off (amb_dev * dev) {
|
|
wr_plain (dev, offsetof(amb_mem, interrupt_control),
|
|
rd_plain (dev, offsetof(amb_mem, interrupt_control))
|
|
&~ AMB_INTERRUPT_BITS);
|
|
}
|
|
|
|
/********** interrupt handling **********/
|
|
|
|
static irqreturn_t interrupt_handler(int irq, void *dev_id) {
|
|
amb_dev * dev = dev_id;
|
|
|
|
PRINTD (DBG_IRQ|DBG_FLOW, "interrupt_handler: %p", dev_id);
|
|
|
|
{
|
|
u32 interrupt = rd_plain (dev, offsetof(amb_mem, interrupt));
|
|
|
|
// for us or someone else sharing the same interrupt
|
|
if (!interrupt) {
|
|
PRINTD (DBG_IRQ, "irq not for me: %d", irq);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
// definitely for us
|
|
PRINTD (DBG_IRQ, "FYI: interrupt was %08x", interrupt);
|
|
wr_plain (dev, offsetof(amb_mem, interrupt), -1);
|
|
}
|
|
|
|
{
|
|
unsigned int irq_work = 0;
|
|
unsigned char pool;
|
|
for (pool = 0; pool < NUM_RX_POOLS; ++pool)
|
|
while (!rx_take (dev, pool))
|
|
++irq_work;
|
|
while (!tx_take (dev))
|
|
++irq_work;
|
|
|
|
if (irq_work) {
|
|
fill_rx_pools (dev);
|
|
|
|
PRINTD (DBG_IRQ, "work done: %u", irq_work);
|
|
} else {
|
|
PRINTD (DBG_IRQ|DBG_WARN, "no work done");
|
|
}
|
|
}
|
|
|
|
PRINTD (DBG_IRQ|DBG_FLOW, "interrupt_handler done: %p", dev_id);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/********** make rate (not quite as much fun as Horizon) **********/
|
|
|
|
static int make_rate (unsigned int rate, rounding r,
|
|
u16 * bits, unsigned int * actual) {
|
|
unsigned char exp = -1; // hush gcc
|
|
unsigned int man = -1; // hush gcc
|
|
|
|
PRINTD (DBG_FLOW|DBG_QOS, "make_rate %u", rate);
|
|
|
|
// rates in cells per second, ITU format (nasty 16-bit floating-point)
|
|
// given 5-bit e and 9-bit m:
|
|
// rate = EITHER (1+m/2^9)*2^e OR 0
|
|
// bits = EITHER 1<<14 | e<<9 | m OR 0
|
|
// (bit 15 is "reserved", bit 14 "non-zero")
|
|
// smallest rate is 0 (special representation)
|
|
// largest rate is (1+511/512)*2^31 = 4290772992 (< 2^32-1)
|
|
// smallest non-zero rate is (1+0/512)*2^0 = 1 (> 0)
|
|
// simple algorithm:
|
|
// find position of top bit, this gives e
|
|
// remove top bit and shift (rounding if feeling clever) by 9-e
|
|
|
|
// ucode bug: please don't set bit 14! so 0 rate not representable
|
|
|
|
if (rate > 0xffc00000U) {
|
|
// larger than largest representable rate
|
|
|
|
if (r == round_up) {
|
|
return -EINVAL;
|
|
} else {
|
|
exp = 31;
|
|
man = 511;
|
|
}
|
|
|
|
} else if (rate) {
|
|
// representable rate
|
|
|
|
exp = 31;
|
|
man = rate;
|
|
|
|
// invariant: rate = man*2^(exp-31)
|
|
while (!(man & (1<<31))) {
|
|
exp = exp - 1;
|
|
man = man<<1;
|
|
}
|
|
|
|
// man has top bit set
|
|
// rate = (2^31+(man-2^31))*2^(exp-31)
|
|
// rate = (1+(man-2^31)/2^31)*2^exp
|
|
man = man<<1;
|
|
man &= 0xffffffffU; // a nop on 32-bit systems
|
|
// rate = (1+man/2^32)*2^exp
|
|
|
|
// exp is in the range 0 to 31, man is in the range 0 to 2^32-1
|
|
// time to lose significance... we want m in the range 0 to 2^9-1
|
|
// rounding presents a minor problem... we first decide which way
|
|
// we are rounding (based on given rounding direction and possibly
|
|
// the bits of the mantissa that are to be discarded).
|
|
|
|
switch (r) {
|
|
case round_down: {
|
|
// just truncate
|
|
man = man>>(32-9);
|
|
break;
|
|
}
|
|
case round_up: {
|
|
// check all bits that we are discarding
|
|
if (man & (~0U>>9)) {
|
|
man = (man>>(32-9)) + 1;
|
|
if (man == (1<<9)) {
|
|
// no need to check for round up outside of range
|
|
man = 0;
|
|
exp += 1;
|
|
}
|
|
} else {
|
|
man = (man>>(32-9));
|
|
}
|
|
break;
|
|
}
|
|
case round_nearest: {
|
|
// check msb that we are discarding
|
|
if (man & (1<<(32-9-1))) {
|
|
man = (man>>(32-9)) + 1;
|
|
if (man == (1<<9)) {
|
|
// no need to check for round up outside of range
|
|
man = 0;
|
|
exp += 1;
|
|
}
|
|
} else {
|
|
man = (man>>(32-9));
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
} else {
|
|
// zero rate - not representable
|
|
|
|
if (r == round_down) {
|
|
return -EINVAL;
|
|
} else {
|
|
exp = 0;
|
|
man = 0;
|
|
}
|
|
|
|
}
|
|
|
|
PRINTD (DBG_QOS, "rate: man=%u, exp=%hu", man, exp);
|
|
|
|
if (bits)
|
|
*bits = /* (1<<14) | */ (exp<<9) | man;
|
|
|
|
if (actual)
|
|
*actual = (exp >= 9)
|
|
? (1 << exp) + (man << (exp-9))
|
|
: (1 << exp) + ((man + (1<<(9-exp-1))) >> (9-exp));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/********** Linux ATM Operations **********/
|
|
|
|
// some are not yet implemented while others do not make sense for
|
|
// this device
|
|
|
|
/********** Open a VC **********/
|
|
|
|
static int amb_open (struct atm_vcc * atm_vcc)
|
|
{
|
|
int error;
|
|
|
|
struct atm_qos * qos;
|
|
struct atm_trafprm * txtp;
|
|
struct atm_trafprm * rxtp;
|
|
u16 tx_rate_bits = -1; // hush gcc
|
|
u16 tx_vc_bits = -1; // hush gcc
|
|
u16 tx_frame_bits = -1; // hush gcc
|
|
|
|
amb_dev * dev = AMB_DEV(atm_vcc->dev);
|
|
amb_vcc * vcc;
|
|
unsigned char pool = -1; // hush gcc
|
|
short vpi = atm_vcc->vpi;
|
|
int vci = atm_vcc->vci;
|
|
|
|
PRINTD (DBG_FLOW|DBG_VCC, "amb_open %x %x", vpi, vci);
|
|
|
|
#ifdef ATM_VPI_UNSPEC
|
|
// UNSPEC is deprecated, remove this code eventually
|
|
if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) {
|
|
PRINTK (KERN_WARNING, "rejecting open with unspecified VPI/VCI (deprecated)");
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
if (!(0 <= vpi && vpi < (1<<NUM_VPI_BITS) &&
|
|
0 <= vci && vci < (1<<NUM_VCI_BITS))) {
|
|
PRINTD (DBG_WARN|DBG_VCC, "VPI/VCI out of range: %hd/%d", vpi, vci);
|
|
return -EINVAL;
|
|
}
|
|
|
|
qos = &atm_vcc->qos;
|
|
|
|
if (qos->aal != ATM_AAL5) {
|
|
PRINTD (DBG_QOS, "AAL not supported");
|
|
return -EINVAL;
|
|
}
|
|
|
|
// traffic parameters
|
|
|
|
PRINTD (DBG_QOS, "TX:");
|
|
txtp = &qos->txtp;
|
|
if (txtp->traffic_class != ATM_NONE) {
|
|
switch (txtp->traffic_class) {
|
|
case ATM_UBR: {
|
|
// we take "the PCR" as a rate-cap
|
|
int pcr = atm_pcr_goal (txtp);
|
|
if (!pcr) {
|
|
// no rate cap
|
|
tx_rate_bits = 0;
|
|
tx_vc_bits = TX_UBR;
|
|
tx_frame_bits = TX_FRAME_NOTCAP;
|
|
} else {
|
|
rounding r;
|
|
if (pcr < 0) {
|
|
r = round_down;
|
|
pcr = -pcr;
|
|
} else {
|
|
r = round_up;
|
|
}
|
|
error = make_rate (pcr, r, &tx_rate_bits, NULL);
|
|
if (error)
|
|
return error;
|
|
tx_vc_bits = TX_UBR_CAPPED;
|
|
tx_frame_bits = TX_FRAME_CAPPED;
|
|
}
|
|
break;
|
|
}
|
|
#if 0
|
|
case ATM_ABR: {
|
|
pcr = atm_pcr_goal (txtp);
|
|
PRINTD (DBG_QOS, "pcr goal = %d", pcr);
|
|
break;
|
|
}
|
|
#endif
|
|
default: {
|
|
// PRINTD (DBG_QOS, "request for non-UBR/ABR denied");
|
|
PRINTD (DBG_QOS, "request for non-UBR denied");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
PRINTD (DBG_QOS, "tx_rate_bits=%hx, tx_vc_bits=%hx",
|
|
tx_rate_bits, tx_vc_bits);
|
|
}
|
|
|
|
PRINTD (DBG_QOS, "RX:");
|
|
rxtp = &qos->rxtp;
|
|
if (rxtp->traffic_class == ATM_NONE) {
|
|
// do nothing
|
|
} else {
|
|
// choose an RX pool (arranged in increasing size)
|
|
for (pool = 0; pool < NUM_RX_POOLS; ++pool)
|
|
if ((unsigned int) rxtp->max_sdu <= dev->rxq[pool].buffer_size) {
|
|
PRINTD (DBG_VCC|DBG_QOS|DBG_POOL, "chose pool %hu (max_sdu %u <= %u)",
|
|
pool, rxtp->max_sdu, dev->rxq[pool].buffer_size);
|
|
break;
|
|
}
|
|
if (pool == NUM_RX_POOLS) {
|
|
PRINTD (DBG_WARN|DBG_VCC|DBG_QOS|DBG_POOL,
|
|
"no pool suitable for VC (RX max_sdu %d is too large)",
|
|
rxtp->max_sdu);
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (rxtp->traffic_class) {
|
|
case ATM_UBR: {
|
|
break;
|
|
}
|
|
#if 0
|
|
case ATM_ABR: {
|
|
pcr = atm_pcr_goal (rxtp);
|
|
PRINTD (DBG_QOS, "pcr goal = %d", pcr);
|
|
break;
|
|
}
|
|
#endif
|
|
default: {
|
|
// PRINTD (DBG_QOS, "request for non-UBR/ABR denied");
|
|
PRINTD (DBG_QOS, "request for non-UBR denied");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
}
|
|
|
|
// get space for our vcc stuff
|
|
vcc = kmalloc (sizeof(amb_vcc), GFP_KERNEL);
|
|
if (!vcc) {
|
|
PRINTK (KERN_ERR, "out of memory!");
|
|
return -ENOMEM;
|
|
}
|
|
atm_vcc->dev_data = (void *) vcc;
|
|
|
|
// no failures beyond this point
|
|
|
|
// we are not really "immediately before allocating the connection
|
|
// identifier in hardware", but it will just have to do!
|
|
set_bit(ATM_VF_ADDR,&atm_vcc->flags);
|
|
|
|
if (txtp->traffic_class != ATM_NONE) {
|
|
command cmd;
|
|
|
|
vcc->tx_frame_bits = tx_frame_bits;
|
|
|
|
mutex_lock(&dev->vcc_sf);
|
|
if (dev->rxer[vci]) {
|
|
// RXer on the channel already, just modify rate...
|
|
cmd.request = cpu_to_be32 (SRB_MODIFY_VC_RATE);
|
|
cmd.args.modify_rate.vc = cpu_to_be32 (vci); // vpi 0
|
|
cmd.args.modify_rate.rate = cpu_to_be32 (tx_rate_bits << SRB_RATE_SHIFT);
|
|
while (command_do (dev, &cmd))
|
|
schedule();
|
|
// ... and TX flags, preserving the RX pool
|
|
cmd.request = cpu_to_be32 (SRB_MODIFY_VC_FLAGS);
|
|
cmd.args.modify_flags.vc = cpu_to_be32 (vci); // vpi 0
|
|
cmd.args.modify_flags.flags = cpu_to_be32
|
|
( (AMB_VCC(dev->rxer[vci])->rx_info.pool << SRB_POOL_SHIFT)
|
|
| (tx_vc_bits << SRB_FLAGS_SHIFT) );
|
|
while (command_do (dev, &cmd))
|
|
schedule();
|
|
} else {
|
|
// no RXer on the channel, just open (with pool zero)
|
|
cmd.request = cpu_to_be32 (SRB_OPEN_VC);
|
|
cmd.args.open.vc = cpu_to_be32 (vci); // vpi 0
|
|
cmd.args.open.flags = cpu_to_be32 (tx_vc_bits << SRB_FLAGS_SHIFT);
|
|
cmd.args.open.rate = cpu_to_be32 (tx_rate_bits << SRB_RATE_SHIFT);
|
|
while (command_do (dev, &cmd))
|
|
schedule();
|
|
}
|
|
dev->txer[vci].tx_present = 1;
|
|
mutex_unlock(&dev->vcc_sf);
|
|
}
|
|
|
|
if (rxtp->traffic_class != ATM_NONE) {
|
|
command cmd;
|
|
|
|
vcc->rx_info.pool = pool;
|
|
|
|
mutex_lock(&dev->vcc_sf);
|
|
/* grow RX buffer pool */
|
|
if (!dev->rxq[pool].buffers_wanted)
|
|
dev->rxq[pool].buffers_wanted = rx_lats;
|
|
dev->rxq[pool].buffers_wanted += 1;
|
|
fill_rx_pool (dev, pool, GFP_KERNEL);
|
|
|
|
if (dev->txer[vci].tx_present) {
|
|
// TXer on the channel already
|
|
// switch (from pool zero) to this pool, preserving the TX bits
|
|
cmd.request = cpu_to_be32 (SRB_MODIFY_VC_FLAGS);
|
|
cmd.args.modify_flags.vc = cpu_to_be32 (vci); // vpi 0
|
|
cmd.args.modify_flags.flags = cpu_to_be32
|
|
( (pool << SRB_POOL_SHIFT)
|
|
| (dev->txer[vci].tx_vc_bits << SRB_FLAGS_SHIFT) );
|
|
} else {
|
|
// no TXer on the channel, open the VC (with no rate info)
|
|
cmd.request = cpu_to_be32 (SRB_OPEN_VC);
|
|
cmd.args.open.vc = cpu_to_be32 (vci); // vpi 0
|
|
cmd.args.open.flags = cpu_to_be32 (pool << SRB_POOL_SHIFT);
|
|
cmd.args.open.rate = cpu_to_be32 (0);
|
|
}
|
|
while (command_do (dev, &cmd))
|
|
schedule();
|
|
// this link allows RX frames through
|
|
dev->rxer[vci] = atm_vcc;
|
|
mutex_unlock(&dev->vcc_sf);
|
|
}
|
|
|
|
// indicate readiness
|
|
set_bit(ATM_VF_READY,&atm_vcc->flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/********** Close a VC **********/
|
|
|
|
static void amb_close (struct atm_vcc * atm_vcc) {
|
|
amb_dev * dev = AMB_DEV (atm_vcc->dev);
|
|
amb_vcc * vcc = AMB_VCC (atm_vcc);
|
|
u16 vci = atm_vcc->vci;
|
|
|
|
PRINTD (DBG_VCC|DBG_FLOW, "amb_close");
|
|
|
|
// indicate unreadiness
|
|
clear_bit(ATM_VF_READY,&atm_vcc->flags);
|
|
|
|
// disable TXing
|
|
if (atm_vcc->qos.txtp.traffic_class != ATM_NONE) {
|
|
command cmd;
|
|
|
|
mutex_lock(&dev->vcc_sf);
|
|
if (dev->rxer[vci]) {
|
|
// RXer still on the channel, just modify rate... XXX not really needed
|
|
cmd.request = cpu_to_be32 (SRB_MODIFY_VC_RATE);
|
|
cmd.args.modify_rate.vc = cpu_to_be32 (vci); // vpi 0
|
|
cmd.args.modify_rate.rate = cpu_to_be32 (0);
|
|
// ... and clear TX rate flags (XXX to stop RM cell output?), preserving RX pool
|
|
} else {
|
|
// no RXer on the channel, close channel
|
|
cmd.request = cpu_to_be32 (SRB_CLOSE_VC);
|
|
cmd.args.close.vc = cpu_to_be32 (vci); // vpi 0
|
|
}
|
|
dev->txer[vci].tx_present = 0;
|
|
while (command_do (dev, &cmd))
|
|
schedule();
|
|
mutex_unlock(&dev->vcc_sf);
|
|
}
|
|
|
|
// disable RXing
|
|
if (atm_vcc->qos.rxtp.traffic_class != ATM_NONE) {
|
|
command cmd;
|
|
|
|
// this is (the?) one reason why we need the amb_vcc struct
|
|
unsigned char pool = vcc->rx_info.pool;
|
|
|
|
mutex_lock(&dev->vcc_sf);
|
|
if (dev->txer[vci].tx_present) {
|
|
// TXer still on the channel, just go to pool zero XXX not really needed
|
|
cmd.request = cpu_to_be32 (SRB_MODIFY_VC_FLAGS);
|
|
cmd.args.modify_flags.vc = cpu_to_be32 (vci); // vpi 0
|
|
cmd.args.modify_flags.flags = cpu_to_be32
|
|
(dev->txer[vci].tx_vc_bits << SRB_FLAGS_SHIFT);
|
|
} else {
|
|
// no TXer on the channel, close the VC
|
|
cmd.request = cpu_to_be32 (SRB_CLOSE_VC);
|
|
cmd.args.close.vc = cpu_to_be32 (vci); // vpi 0
|
|
}
|
|
// forget the rxer - no more skbs will be pushed
|
|
if (atm_vcc != dev->rxer[vci])
|
|
PRINTK (KERN_ERR, "%s vcc=%p rxer[vci]=%p",
|
|
"arghhh! we're going to die!",
|
|
vcc, dev->rxer[vci]);
|
|
dev->rxer[vci] = NULL;
|
|
while (command_do (dev, &cmd))
|
|
schedule();
|
|
|
|
/* shrink RX buffer pool */
|
|
dev->rxq[pool].buffers_wanted -= 1;
|
|
if (dev->rxq[pool].buffers_wanted == rx_lats) {
|
|
dev->rxq[pool].buffers_wanted = 0;
|
|
drain_rx_pool (dev, pool);
|
|
}
|
|
mutex_unlock(&dev->vcc_sf);
|
|
}
|
|
|
|
// free our structure
|
|
kfree (vcc);
|
|
|
|
// say the VPI/VCI is free again
|
|
clear_bit(ATM_VF_ADDR,&atm_vcc->flags);
|
|
|
|
return;
|
|
}
|
|
|
|
/********** Send **********/
|
|
|
|
static int amb_send (struct atm_vcc * atm_vcc, struct sk_buff * skb) {
|
|
amb_dev * dev = AMB_DEV(atm_vcc->dev);
|
|
amb_vcc * vcc = AMB_VCC(atm_vcc);
|
|
u16 vc = atm_vcc->vci;
|
|
unsigned int tx_len = skb->len;
|
|
unsigned char * tx_data = skb->data;
|
|
tx_simple * tx_descr;
|
|
tx_in tx;
|
|
|
|
if (test_bit (dead, &dev->flags))
|
|
return -EIO;
|
|
|
|
PRINTD (DBG_FLOW|DBG_TX, "amb_send vc %x data %p len %u",
|
|
vc, tx_data, tx_len);
|
|
|
|
dump_skb (">>>", vc, skb);
|
|
|
|
if (!dev->txer[vc].tx_present) {
|
|
PRINTK (KERN_ERR, "attempt to send on RX-only VC %x", vc);
|
|
return -EBADFD;
|
|
}
|
|
|
|
// this is a driver private field so we have to set it ourselves,
|
|
// despite the fact that we are _required_ to use it to check for a
|
|
// pop function
|
|
ATM_SKB(skb)->vcc = atm_vcc;
|
|
|
|
if (skb->len > (size_t) atm_vcc->qos.txtp.max_sdu) {
|
|
PRINTK (KERN_ERR, "sk_buff length greater than agreed max_sdu, dropping...");
|
|
return -EIO;
|
|
}
|
|
|
|
if (check_area (skb->data, skb->len)) {
|
|
atomic_inc(&atm_vcc->stats->tx_err);
|
|
return -ENOMEM; // ?
|
|
}
|
|
|
|
// allocate memory for fragments
|
|
tx_descr = kmalloc (sizeof(tx_simple), GFP_KERNEL);
|
|
if (!tx_descr) {
|
|
PRINTK (KERN_ERR, "could not allocate TX descriptor");
|
|
return -ENOMEM;
|
|
}
|
|
if (check_area (tx_descr, sizeof(tx_simple))) {
|
|
kfree (tx_descr);
|
|
return -ENOMEM;
|
|
}
|
|
PRINTD (DBG_TX, "fragment list allocated at %p", tx_descr);
|
|
|
|
tx_descr->skb = skb;
|
|
|
|
tx_descr->tx_frag.bytes = cpu_to_be32 (tx_len);
|
|
tx_descr->tx_frag.address = cpu_to_be32 (virt_to_bus (tx_data));
|
|
|
|
tx_descr->tx_frag_end.handle = virt_to_bus (tx_descr);
|
|
tx_descr->tx_frag_end.vc = 0;
|
|
tx_descr->tx_frag_end.next_descriptor_length = 0;
|
|
tx_descr->tx_frag_end.next_descriptor = 0;
|
|
#ifdef AMB_NEW_MICROCODE
|
|
tx_descr->tx_frag_end.cpcs_uu = 0;
|
|
tx_descr->tx_frag_end.cpi = 0;
|
|
tx_descr->tx_frag_end.pad = 0;
|
|
#endif
|
|
|
|
tx.vc = cpu_to_be16 (vcc->tx_frame_bits | vc);
|
|
tx.tx_descr_length = cpu_to_be16 (sizeof(tx_frag)+sizeof(tx_frag_end));
|
|
tx.tx_descr_addr = cpu_to_be32 (virt_to_bus (&tx_descr->tx_frag));
|
|
|
|
while (tx_give (dev, &tx))
|
|
schedule();
|
|
return 0;
|
|
}
|
|
|
|
/********** Change QoS on a VC **********/
|
|
|
|
// int amb_change_qos (struct atm_vcc * atm_vcc, struct atm_qos * qos, int flags);
|
|
|
|
/********** Free RX Socket Buffer **********/
|
|
|
|
#if 0
|
|
static void amb_free_rx_skb (struct atm_vcc * atm_vcc, struct sk_buff * skb) {
|
|
amb_dev * dev = AMB_DEV (atm_vcc->dev);
|
|
amb_vcc * vcc = AMB_VCC (atm_vcc);
|
|
unsigned char pool = vcc->rx_info.pool;
|
|
rx_in rx;
|
|
|
|
// This may be unsafe for various reasons that I cannot really guess
|
|
// at. However, I note that the ATM layer calls kfree_skb rather
|
|
// than dev_kfree_skb at this point so we are least covered as far
|
|
// as buffer locking goes. There may be bugs if pcap clones RX skbs.
|
|
|
|
PRINTD (DBG_FLOW|DBG_SKB, "amb_rx_free skb %p (atm_vcc %p, vcc %p)",
|
|
skb, atm_vcc, vcc);
|
|
|
|
rx.handle = virt_to_bus (skb);
|
|
rx.host_address = cpu_to_be32 (virt_to_bus (skb->data));
|
|
|
|
skb->data = skb->head;
|
|
skb_reset_tail_pointer(skb);
|
|
skb->len = 0;
|
|
|
|
if (!rx_give (dev, &rx, pool)) {
|
|
// success
|
|
PRINTD (DBG_SKB|DBG_POOL, "recycled skb for pool %hu", pool);
|
|
return;
|
|
}
|
|
|
|
// just do what the ATM layer would have done
|
|
dev_kfree_skb_any (skb);
|
|
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
/********** Proc File Output **********/
|
|
|
|
static int amb_proc_read (struct atm_dev * atm_dev, loff_t * pos, char * page) {
|
|
amb_dev * dev = AMB_DEV (atm_dev);
|
|
int left = *pos;
|
|
unsigned char pool;
|
|
|
|
PRINTD (DBG_FLOW, "amb_proc_read");
|
|
|
|
/* more diagnostics here? */
|
|
|
|
if (!left--) {
|
|
amb_stats * s = &dev->stats;
|
|
return sprintf (page,
|
|
"frames: TX OK %lu, RX OK %lu, RX bad %lu "
|
|
"(CRC %lu, long %lu, aborted %lu, unused %lu).\n",
|
|
s->tx_ok, s->rx.ok, s->rx.error,
|
|
s->rx.badcrc, s->rx.toolong,
|
|
s->rx.aborted, s->rx.unused);
|
|
}
|
|
|
|
if (!left--) {
|
|
amb_cq * c = &dev->cq;
|
|
return sprintf (page, "cmd queue [cur/hi/max]: %u/%u/%u. ",
|
|
c->pending, c->high, c->maximum);
|
|
}
|
|
|
|
if (!left--) {
|
|
amb_txq * t = &dev->txq;
|
|
return sprintf (page, "TX queue [cur/max high full]: %u/%u %u %u.\n",
|
|
t->pending, t->maximum, t->high, t->filled);
|
|
}
|
|
|
|
if (!left--) {
|
|
unsigned int count = sprintf (page, "RX queues [cur/max/req low empty]:");
|
|
for (pool = 0; pool < NUM_RX_POOLS; ++pool) {
|
|
amb_rxq * r = &dev->rxq[pool];
|
|
count += sprintf (page+count, " %u/%u/%u %u %u",
|
|
r->pending, r->maximum, r->buffers_wanted, r->low, r->emptied);
|
|
}
|
|
count += sprintf (page+count, ".\n");
|
|
return count;
|
|
}
|
|
|
|
if (!left--) {
|
|
unsigned int count = sprintf (page, "RX buffer sizes:");
|
|
for (pool = 0; pool < NUM_RX_POOLS; ++pool) {
|
|
amb_rxq * r = &dev->rxq[pool];
|
|
count += sprintf (page+count, " %u", r->buffer_size);
|
|
}
|
|
count += sprintf (page+count, ".\n");
|
|
return count;
|
|
}
|
|
|
|
#if 0
|
|
if (!left--) {
|
|
// suni block etc?
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
/********** Operation Structure **********/
|
|
|
|
static const struct atmdev_ops amb_ops = {
|
|
.open = amb_open,
|
|
.close = amb_close,
|
|
.send = amb_send,
|
|
.proc_read = amb_proc_read,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
/********** housekeeping **********/
|
|
static void do_housekeeping (unsigned long arg) {
|
|
amb_dev * dev = (amb_dev *) arg;
|
|
|
|
// could collect device-specific (not driver/atm-linux) stats here
|
|
|
|
// last resort refill once every ten seconds
|
|
fill_rx_pools (dev);
|
|
mod_timer(&dev->housekeeping, jiffies + 10*HZ);
|
|
|
|
return;
|
|
}
|
|
|
|
/********** creation of communication queues **********/
|
|
|
|
static int create_queues(amb_dev *dev, unsigned int cmds, unsigned int txs,
|
|
unsigned int *rxs, unsigned int *rx_buffer_sizes)
|
|
{
|
|
unsigned char pool;
|
|
size_t total = 0;
|
|
void * memory;
|
|
void * limit;
|
|
|
|
PRINTD (DBG_FLOW, "create_queues %p", dev);
|
|
|
|
total += cmds * sizeof(command);
|
|
|
|
total += txs * (sizeof(tx_in) + sizeof(tx_out));
|
|
|
|
for (pool = 0; pool < NUM_RX_POOLS; ++pool)
|
|
total += rxs[pool] * (sizeof(rx_in) + sizeof(rx_out));
|
|
|
|
memory = kmalloc (total, GFP_KERNEL);
|
|
if (!memory) {
|
|
PRINTK (KERN_ERR, "could not allocate queues");
|
|
return -ENOMEM;
|
|
}
|
|
if (check_area (memory, total)) {
|
|
PRINTK (KERN_ERR, "queues allocated in nasty area");
|
|
kfree (memory);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
limit = memory + total;
|
|
PRINTD (DBG_INIT, "queues from %p to %p", memory, limit);
|
|
|
|
PRINTD (DBG_CMD, "command queue at %p", memory);
|
|
|
|
{
|
|
command * cmd = memory;
|
|
amb_cq * cq = &dev->cq;
|
|
|
|
cq->pending = 0;
|
|
cq->high = 0;
|
|
cq->maximum = cmds - 1;
|
|
|
|
cq->ptrs.start = cmd;
|
|
cq->ptrs.in = cmd;
|
|
cq->ptrs.out = cmd;
|
|
cq->ptrs.limit = cmd + cmds;
|
|
|
|
memory = cq->ptrs.limit;
|
|
}
|
|
|
|
PRINTD (DBG_TX, "TX queue pair at %p", memory);
|
|
|
|
{
|
|
tx_in * in = memory;
|
|
tx_out * out;
|
|
amb_txq * txq = &dev->txq;
|
|
|
|
txq->pending = 0;
|
|
txq->high = 0;
|
|
txq->filled = 0;
|
|
txq->maximum = txs - 1;
|
|
|
|
txq->in.start = in;
|
|
txq->in.ptr = in;
|
|
txq->in.limit = in + txs;
|
|
|
|
memory = txq->in.limit;
|
|
out = memory;
|
|
|
|
txq->out.start = out;
|
|
txq->out.ptr = out;
|
|
txq->out.limit = out + txs;
|
|
|
|
memory = txq->out.limit;
|
|
}
|
|
|
|
PRINTD (DBG_RX, "RX queue pairs at %p", memory);
|
|
|
|
for (pool = 0; pool < NUM_RX_POOLS; ++pool) {
|
|
rx_in * in = memory;
|
|
rx_out * out;
|
|
amb_rxq * rxq = &dev->rxq[pool];
|
|
|
|
rxq->buffer_size = rx_buffer_sizes[pool];
|
|
rxq->buffers_wanted = 0;
|
|
|
|
rxq->pending = 0;
|
|
rxq->low = rxs[pool] - 1;
|
|
rxq->emptied = 0;
|
|
rxq->maximum = rxs[pool] - 1;
|
|
|
|
rxq->in.start = in;
|
|
rxq->in.ptr = in;
|
|
rxq->in.limit = in + rxs[pool];
|
|
|
|
memory = rxq->in.limit;
|
|
out = memory;
|
|
|
|
rxq->out.start = out;
|
|
rxq->out.ptr = out;
|
|
rxq->out.limit = out + rxs[pool];
|
|
|
|
memory = rxq->out.limit;
|
|
}
|
|
|
|
if (memory == limit) {
|
|
return 0;
|
|
} else {
|
|
PRINTK (KERN_ERR, "bad queue alloc %p != %p (tell maintainer)", memory, limit);
|
|
kfree (limit - total);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
}
|
|
|
|
/********** destruction of communication queues **********/
|
|
|
|
static void destroy_queues (amb_dev * dev) {
|
|
// all queues assumed empty
|
|
void * memory = dev->cq.ptrs.start;
|
|
// includes txq.in, txq.out, rxq[].in and rxq[].out
|
|
|
|
PRINTD (DBG_FLOW, "destroy_queues %p", dev);
|
|
|
|
PRINTD (DBG_INIT, "freeing queues at %p", memory);
|
|
kfree (memory);
|
|
|
|
return;
|
|
}
|
|
|
|
/********** basic loader commands and error handling **********/
|
|
// centisecond timeouts - guessing away here
|
|
static unsigned int command_timeouts [] = {
|
|
[host_memory_test] = 15,
|
|
[read_adapter_memory] = 2,
|
|
[write_adapter_memory] = 2,
|
|
[adapter_start] = 50,
|
|
[get_version_number] = 10,
|
|
[interrupt_host] = 1,
|
|
[flash_erase_sector] = 1,
|
|
[adap_download_block] = 1,
|
|
[adap_erase_flash] = 1,
|
|
[adap_run_in_iram] = 1,
|
|
[adap_end_download] = 1
|
|
};
|
|
|
|
|
|
static unsigned int command_successes [] = {
|
|
[host_memory_test] = COMMAND_PASSED_TEST,
|
|
[read_adapter_memory] = COMMAND_READ_DATA_OK,
|
|
[write_adapter_memory] = COMMAND_WRITE_DATA_OK,
|
|
[adapter_start] = COMMAND_COMPLETE,
|
|
[get_version_number] = COMMAND_COMPLETE,
|
|
[interrupt_host] = COMMAND_COMPLETE,
|
|
[flash_erase_sector] = COMMAND_COMPLETE,
|
|
[adap_download_block] = COMMAND_COMPLETE,
|
|
[adap_erase_flash] = COMMAND_COMPLETE,
|
|
[adap_run_in_iram] = COMMAND_COMPLETE,
|
|
[adap_end_download] = COMMAND_COMPLETE
|
|
};
|
|
|
|
static int decode_loader_result (loader_command cmd, u32 result)
|
|
{
|
|
int res;
|
|
const char *msg;
|
|
|
|
if (result == command_successes[cmd])
|
|
return 0;
|
|
|
|
switch (result) {
|
|
case BAD_COMMAND:
|
|
res = -EINVAL;
|
|
msg = "bad command";
|
|
break;
|
|
case COMMAND_IN_PROGRESS:
|
|
res = -ETIMEDOUT;
|
|
msg = "command in progress";
|
|
break;
|
|
case COMMAND_PASSED_TEST:
|
|
res = 0;
|
|
msg = "command passed test";
|
|
break;
|
|
case COMMAND_FAILED_TEST:
|
|
res = -EIO;
|
|
msg = "command failed test";
|
|
break;
|
|
case COMMAND_READ_DATA_OK:
|
|
res = 0;
|
|
msg = "command read data ok";
|
|
break;
|
|
case COMMAND_READ_BAD_ADDRESS:
|
|
res = -EINVAL;
|
|
msg = "command read bad address";
|
|
break;
|
|
case COMMAND_WRITE_DATA_OK:
|
|
res = 0;
|
|
msg = "command write data ok";
|
|
break;
|
|
case COMMAND_WRITE_BAD_ADDRESS:
|
|
res = -EINVAL;
|
|
msg = "command write bad address";
|
|
break;
|
|
case COMMAND_WRITE_FLASH_FAILURE:
|
|
res = -EIO;
|
|
msg = "command write flash failure";
|
|
break;
|
|
case COMMAND_COMPLETE:
|
|
res = 0;
|
|
msg = "command complete";
|
|
break;
|
|
case COMMAND_FLASH_ERASE_FAILURE:
|
|
res = -EIO;
|
|
msg = "command flash erase failure";
|
|
break;
|
|
case COMMAND_WRITE_BAD_DATA:
|
|
res = -EINVAL;
|
|
msg = "command write bad data";
|
|
break;
|
|
default:
|
|
res = -EINVAL;
|
|
msg = "unknown error";
|
|
PRINTD (DBG_LOAD|DBG_ERR,
|
|
"decode_loader_result got %d=%x !",
|
|
result, result);
|
|
break;
|
|
}
|
|
|
|
PRINTK (KERN_ERR, "%s", msg);
|
|
return res;
|
|
}
|
|
|
|
static int do_loader_command(volatile loader_block *lb, const amb_dev *dev,
|
|
loader_command cmd)
|
|
{
|
|
|
|
unsigned long timeout;
|
|
|
|
PRINTD (DBG_FLOW|DBG_LOAD, "do_loader_command");
|
|
|
|
/* do a command
|
|
|
|
Set the return value to zero, set the command type and set the
|
|
valid entry to the right magic value. The payload is already
|
|
correctly byte-ordered so we leave it alone. Hit the doorbell
|
|
with the bus address of this structure.
|
|
|
|
*/
|
|
|
|
lb->result = 0;
|
|
lb->command = cpu_to_be32 (cmd);
|
|
lb->valid = cpu_to_be32 (DMA_VALID);
|
|
// dump_registers (dev);
|
|
// dump_loader_block (lb);
|
|
wr_mem (dev, offsetof(amb_mem, doorbell), virt_to_bus (lb) & ~onegigmask);
|
|
|
|
timeout = command_timeouts[cmd] * 10;
|
|
|
|
while (!lb->result || lb->result == cpu_to_be32 (COMMAND_IN_PROGRESS))
|
|
if (timeout) {
|
|
timeout = msleep_interruptible(timeout);
|
|
} else {
|
|
PRINTD (DBG_LOAD|DBG_ERR, "command %d timed out", cmd);
|
|
dump_registers (dev);
|
|
dump_loader_block (lb);
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
if (cmd == adapter_start) {
|
|
// wait for start command to acknowledge...
|
|
timeout = 100;
|
|
while (rd_plain (dev, offsetof(amb_mem, doorbell)))
|
|
if (timeout) {
|
|
timeout = msleep_interruptible(timeout);
|
|
} else {
|
|
PRINTD (DBG_LOAD|DBG_ERR, "start command did not clear doorbell, res=%08x",
|
|
be32_to_cpu (lb->result));
|
|
dump_registers (dev);
|
|
return -ETIMEDOUT;
|
|
}
|
|
return 0;
|
|
} else {
|
|
return decode_loader_result (cmd, be32_to_cpu (lb->result));
|
|
}
|
|
|
|
}
|
|
|
|
/* loader: determine loader version */
|
|
|
|
static int get_loader_version(loader_block *lb, const amb_dev *dev,
|
|
u32 *version)
|
|
{
|
|
int res;
|
|
|
|
PRINTD (DBG_FLOW|DBG_LOAD, "get_loader_version");
|
|
|
|
res = do_loader_command (lb, dev, get_version_number);
|
|
if (res)
|
|
return res;
|
|
if (version)
|
|
*version = be32_to_cpu (lb->payload.version);
|
|
return 0;
|
|
}
|
|
|
|
/* loader: write memory data blocks */
|
|
|
|
static int loader_write(loader_block *lb, const amb_dev *dev,
|
|
const struct ihex_binrec *rec)
|
|
{
|
|
transfer_block * tb = &lb->payload.transfer;
|
|
|
|
PRINTD (DBG_FLOW|DBG_LOAD, "loader_write");
|
|
|
|
tb->address = rec->addr;
|
|
tb->count = cpu_to_be32(be16_to_cpu(rec->len) / 4);
|
|
memcpy(tb->data, rec->data, be16_to_cpu(rec->len));
|
|
return do_loader_command (lb, dev, write_adapter_memory);
|
|
}
|
|
|
|
/* loader: verify memory data blocks */
|
|
|
|
static int loader_verify(loader_block *lb, const amb_dev *dev,
|
|
const struct ihex_binrec *rec)
|
|
{
|
|
transfer_block * tb = &lb->payload.transfer;
|
|
int res;
|
|
|
|
PRINTD (DBG_FLOW|DBG_LOAD, "loader_verify");
|
|
|
|
tb->address = rec->addr;
|
|
tb->count = cpu_to_be32(be16_to_cpu(rec->len) / 4);
|
|
res = do_loader_command (lb, dev, read_adapter_memory);
|
|
if (!res && memcmp(tb->data, rec->data, be16_to_cpu(rec->len)))
|
|
res = -EINVAL;
|
|
return res;
|
|
}
|
|
|
|
/* loader: start microcode */
|
|
|
|
static int loader_start(loader_block *lb, const amb_dev *dev, u32 address)
|
|
{
|
|
PRINTD (DBG_FLOW|DBG_LOAD, "loader_start");
|
|
|
|
lb->payload.start = cpu_to_be32 (address);
|
|
return do_loader_command (lb, dev, adapter_start);
|
|
}
|
|
|
|
/********** reset card **********/
|
|
|
|
static inline void sf (const char * msg)
|
|
{
|
|
PRINTK (KERN_ERR, "self-test failed: %s", msg);
|
|
}
|
|
|
|
static int amb_reset (amb_dev * dev, int diags) {
|
|
u32 word;
|
|
|
|
PRINTD (DBG_FLOW|DBG_LOAD, "amb_reset");
|
|
|
|
word = rd_plain (dev, offsetof(amb_mem, reset_control));
|
|
// put card into reset state
|
|
wr_plain (dev, offsetof(amb_mem, reset_control), word | AMB_RESET_BITS);
|
|
// wait a short while
|
|
udelay (10);
|
|
#if 1
|
|
// put card into known good state
|
|
wr_plain (dev, offsetof(amb_mem, interrupt_control), AMB_DOORBELL_BITS);
|
|
// clear all interrupts just in case
|
|
wr_plain (dev, offsetof(amb_mem, interrupt), -1);
|
|
#endif
|
|
// clear self-test done flag
|
|
wr_plain (dev, offsetof(amb_mem, mb.loader.ready), 0);
|
|
// take card out of reset state
|
|
wr_plain (dev, offsetof(amb_mem, reset_control), word &~ AMB_RESET_BITS);
|
|
|
|
if (diags) {
|
|
unsigned long timeout;
|
|
// 4.2 second wait
|
|
msleep(4200);
|
|
// half second time-out
|
|
timeout = 500;
|
|
while (!rd_plain (dev, offsetof(amb_mem, mb.loader.ready)))
|
|
if (timeout) {
|
|
timeout = msleep_interruptible(timeout);
|
|
} else {
|
|
PRINTD (DBG_LOAD|DBG_ERR, "reset timed out");
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
// get results of self-test
|
|
// XXX double check byte-order
|
|
word = rd_mem (dev, offsetof(amb_mem, mb.loader.result));
|
|
if (word & SELF_TEST_FAILURE) {
|
|
if (word & GPINT_TST_FAILURE)
|
|
sf ("interrupt");
|
|
if (word & SUNI_DATA_PATTERN_FAILURE)
|
|
sf ("SUNI data pattern");
|
|
if (word & SUNI_DATA_BITS_FAILURE)
|
|
sf ("SUNI data bits");
|
|
if (word & SUNI_UTOPIA_FAILURE)
|
|
sf ("SUNI UTOPIA interface");
|
|
if (word & SUNI_FIFO_FAILURE)
|
|
sf ("SUNI cell buffer FIFO");
|
|
if (word & SRAM_FAILURE)
|
|
sf ("bad SRAM");
|
|
// better return value?
|
|
return -EIO;
|
|
}
|
|
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/********** transfer and start the microcode **********/
|
|
|
|
static int ucode_init(loader_block *lb, amb_dev *dev)
|
|
{
|
|
const struct firmware *fw;
|
|
unsigned long start_address;
|
|
const struct ihex_binrec *rec;
|
|
const char *errmsg = 0;
|
|
int res;
|
|
|
|
res = request_ihex_firmware(&fw, "atmsar11.fw", &dev->pci_dev->dev);
|
|
if (res) {
|
|
PRINTK (KERN_ERR, "Cannot load microcode data");
|
|
return res;
|
|
}
|
|
|
|
/* First record contains just the start address */
|
|
rec = (const struct ihex_binrec *)fw->data;
|
|
if (be16_to_cpu(rec->len) != sizeof(__be32) || be32_to_cpu(rec->addr)) {
|
|
errmsg = "no start record";
|
|
goto fail;
|
|
}
|
|
start_address = be32_to_cpup((__be32 *)rec->data);
|
|
|
|
rec = ihex_next_binrec(rec);
|
|
|
|
PRINTD (DBG_FLOW|DBG_LOAD, "ucode_init");
|
|
|
|
while (rec) {
|
|
PRINTD (DBG_LOAD, "starting region (%x, %u)", be32_to_cpu(rec->addr),
|
|
be16_to_cpu(rec->len));
|
|
if (be16_to_cpu(rec->len) > 4 * MAX_TRANSFER_DATA) {
|
|
errmsg = "record too long";
|
|
goto fail;
|
|
}
|
|
if (be16_to_cpu(rec->len) & 3) {
|
|
errmsg = "odd number of bytes";
|
|
goto fail;
|
|
}
|
|
res = loader_write(lb, dev, rec);
|
|
if (res)
|
|
break;
|
|
|
|
res = loader_verify(lb, dev, rec);
|
|
if (res)
|
|
break;
|
|
rec = ihex_next_binrec(rec);
|
|
}
|
|
release_firmware(fw);
|
|
if (!res)
|
|
res = loader_start(lb, dev, start_address);
|
|
|
|
return res;
|
|
fail:
|
|
release_firmware(fw);
|
|
PRINTK(KERN_ERR, "Bad microcode data (%s)", errmsg);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/********** give adapter parameters **********/
|
|
|
|
static inline __be32 bus_addr(void * addr) {
|
|
return cpu_to_be32 (virt_to_bus (addr));
|
|
}
|
|
|
|
static int amb_talk(amb_dev *dev)
|
|
{
|
|
adap_talk_block a;
|
|
unsigned char pool;
|
|
unsigned long timeout;
|
|
|
|
PRINTD (DBG_FLOW, "amb_talk %p", dev);
|
|
|
|
a.command_start = bus_addr (dev->cq.ptrs.start);
|
|
a.command_end = bus_addr (dev->cq.ptrs.limit);
|
|
a.tx_start = bus_addr (dev->txq.in.start);
|
|
a.tx_end = bus_addr (dev->txq.in.limit);
|
|
a.txcom_start = bus_addr (dev->txq.out.start);
|
|
a.txcom_end = bus_addr (dev->txq.out.limit);
|
|
|
|
for (pool = 0; pool < NUM_RX_POOLS; ++pool) {
|
|
// the other "a" items are set up by the adapter
|
|
a.rec_struct[pool].buffer_start = bus_addr (dev->rxq[pool].in.start);
|
|
a.rec_struct[pool].buffer_end = bus_addr (dev->rxq[pool].in.limit);
|
|
a.rec_struct[pool].rx_start = bus_addr (dev->rxq[pool].out.start);
|
|
a.rec_struct[pool].rx_end = bus_addr (dev->rxq[pool].out.limit);
|
|
a.rec_struct[pool].buffer_size = cpu_to_be32 (dev->rxq[pool].buffer_size);
|
|
}
|
|
|
|
#ifdef AMB_NEW_MICROCODE
|
|
// disable fast PLX prefetching
|
|
a.init_flags = 0;
|
|
#endif
|
|
|
|
// pass the structure
|
|
wr_mem (dev, offsetof(amb_mem, doorbell), virt_to_bus (&a));
|
|
|
|
// 2.2 second wait (must not touch doorbell during 2 second DMA test)
|
|
msleep(2200);
|
|
// give the adapter another half second?
|
|
timeout = 500;
|
|
while (rd_plain (dev, offsetof(amb_mem, doorbell)))
|
|
if (timeout) {
|
|
timeout = msleep_interruptible(timeout);
|
|
} else {
|
|
PRINTD (DBG_INIT|DBG_ERR, "adapter init timed out");
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
// get microcode version
|
|
static void amb_ucode_version(amb_dev *dev)
|
|
{
|
|
u32 major;
|
|
u32 minor;
|
|
command cmd;
|
|
cmd.request = cpu_to_be32 (SRB_GET_VERSION);
|
|
while (command_do (dev, &cmd)) {
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
schedule();
|
|
}
|
|
major = be32_to_cpu (cmd.args.version.major);
|
|
minor = be32_to_cpu (cmd.args.version.minor);
|
|
PRINTK (KERN_INFO, "microcode version is %u.%u", major, minor);
|
|
}
|
|
|
|
// get end station address
|
|
static void amb_esi(amb_dev *dev, u8 *esi)
|
|
{
|
|
u32 lower4;
|
|
u16 upper2;
|
|
command cmd;
|
|
|
|
cmd.request = cpu_to_be32 (SRB_GET_BIA);
|
|
while (command_do (dev, &cmd)) {
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
schedule();
|
|
}
|
|
lower4 = be32_to_cpu (cmd.args.bia.lower4);
|
|
upper2 = be32_to_cpu (cmd.args.bia.upper2);
|
|
PRINTD (DBG_LOAD, "BIA: lower4: %08x, upper2 %04x", lower4, upper2);
|
|
|
|
if (esi) {
|
|
unsigned int i;
|
|
|
|
PRINTDB (DBG_INIT, "ESI:");
|
|
for (i = 0; i < ESI_LEN; ++i) {
|
|
if (i < 4)
|
|
esi[i] = bitrev8(lower4>>(8*i));
|
|
else
|
|
esi[i] = bitrev8(upper2>>(8*(i-4)));
|
|
PRINTDM (DBG_INIT, " %02x", esi[i]);
|
|
}
|
|
|
|
PRINTDE (DBG_INIT, "");
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
static void fixup_plx_window (amb_dev *dev, loader_block *lb)
|
|
{
|
|
// fix up the PLX-mapped window base address to match the block
|
|
unsigned long blb;
|
|
u32 mapreg;
|
|
blb = virt_to_bus(lb);
|
|
// the kernel stack had better not ever cross a 1Gb boundary!
|
|
mapreg = rd_plain (dev, offsetof(amb_mem, stuff[10]));
|
|
mapreg &= ~onegigmask;
|
|
mapreg |= blb & onegigmask;
|
|
wr_plain (dev, offsetof(amb_mem, stuff[10]), mapreg);
|
|
return;
|
|
}
|
|
|
|
static int amb_init(amb_dev *dev)
|
|
{
|
|
loader_block lb;
|
|
|
|
u32 version;
|
|
|
|
if (amb_reset (dev, 1)) {
|
|
PRINTK (KERN_ERR, "card reset failed!");
|
|
} else {
|
|
fixup_plx_window (dev, &lb);
|
|
|
|
if (get_loader_version (&lb, dev, &version)) {
|
|
PRINTK (KERN_INFO, "failed to get loader version");
|
|
} else {
|
|
PRINTK (KERN_INFO, "loader version is %08x", version);
|
|
|
|
if (ucode_init (&lb, dev)) {
|
|
PRINTK (KERN_ERR, "microcode failure");
|
|
} else if (create_queues (dev, cmds, txs, rxs, rxs_bs)) {
|
|
PRINTK (KERN_ERR, "failed to get memory for queues");
|
|
} else {
|
|
|
|
if (amb_talk (dev)) {
|
|
PRINTK (KERN_ERR, "adapter did not accept queues");
|
|
} else {
|
|
|
|
amb_ucode_version (dev);
|
|
return 0;
|
|
|
|
} /* amb_talk */
|
|
|
|
destroy_queues (dev);
|
|
} /* create_queues, ucode_init */
|
|
|
|
amb_reset (dev, 0);
|
|
} /* get_loader_version */
|
|
|
|
} /* amb_reset */
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void setup_dev(amb_dev *dev, struct pci_dev *pci_dev)
|
|
{
|
|
unsigned char pool;
|
|
|
|
// set up known dev items straight away
|
|
dev->pci_dev = pci_dev;
|
|
pci_set_drvdata(pci_dev, dev);
|
|
|
|
dev->iobase = pci_resource_start (pci_dev, 1);
|
|
dev->irq = pci_dev->irq;
|
|
dev->membase = bus_to_virt(pci_resource_start(pci_dev, 0));
|
|
|
|
// flags (currently only dead)
|
|
dev->flags = 0;
|
|
|
|
// Allocate cell rates (fibre)
|
|
// ATM_OC3_PCR = 1555200000/8/270*260/53 - 29/53
|
|
// to be really pedantic, this should be ATM_OC3c_PCR
|
|
dev->tx_avail = ATM_OC3_PCR;
|
|
dev->rx_avail = ATM_OC3_PCR;
|
|
|
|
// semaphore for txer/rxer modifications - we cannot use a
|
|
// spinlock as the critical region needs to switch processes
|
|
mutex_init(&dev->vcc_sf);
|
|
// queue manipulation spinlocks; we want atomic reads and
|
|
// writes to the queue descriptors (handles IRQ and SMP)
|
|
// consider replacing "int pending" -> "atomic_t available"
|
|
// => problem related to who gets to move queue pointers
|
|
spin_lock_init (&dev->cq.lock);
|
|
spin_lock_init (&dev->txq.lock);
|
|
for (pool = 0; pool < NUM_RX_POOLS; ++pool)
|
|
spin_lock_init (&dev->rxq[pool].lock);
|
|
}
|
|
|
|
static void setup_pci_dev(struct pci_dev *pci_dev)
|
|
{
|
|
unsigned char lat;
|
|
|
|
// enable bus master accesses
|
|
pci_set_master(pci_dev);
|
|
|
|
// frobnicate latency (upwards, usually)
|
|
pci_read_config_byte (pci_dev, PCI_LATENCY_TIMER, &lat);
|
|
|
|
if (!pci_lat)
|
|
pci_lat = (lat < MIN_PCI_LATENCY) ? MIN_PCI_LATENCY : lat;
|
|
|
|
if (lat != pci_lat) {
|
|
PRINTK (KERN_INFO, "Changing PCI latency timer from %hu to %hu",
|
|
lat, pci_lat);
|
|
pci_write_config_byte(pci_dev, PCI_LATENCY_TIMER, pci_lat);
|
|
}
|
|
}
|
|
|
|
static int amb_probe(struct pci_dev *pci_dev,
|
|
const struct pci_device_id *pci_ent)
|
|
{
|
|
amb_dev * dev;
|
|
int err;
|
|
unsigned int irq;
|
|
|
|
err = pci_enable_device(pci_dev);
|
|
if (err < 0) {
|
|
PRINTK (KERN_ERR, "skipped broken (PLX rev 2) card");
|
|
goto out;
|
|
}
|
|
|
|
// read resources from PCI configuration space
|
|
irq = pci_dev->irq;
|
|
|
|
if (pci_dev->device == PCI_DEVICE_ID_MADGE_AMBASSADOR_BAD) {
|
|
PRINTK (KERN_ERR, "skipped broken (PLX rev 2) card");
|
|
err = -EINVAL;
|
|
goto out_disable;
|
|
}
|
|
|
|
PRINTD (DBG_INFO, "found Madge ATM adapter (amb) at"
|
|
" IO %llx, IRQ %u, MEM %p",
|
|
(unsigned long long)pci_resource_start(pci_dev, 1),
|
|
irq, bus_to_virt(pci_resource_start(pci_dev, 0)));
|
|
|
|
// check IO region
|
|
err = pci_request_region(pci_dev, 1, DEV_LABEL);
|
|
if (err < 0) {
|
|
PRINTK (KERN_ERR, "IO range already in use!");
|
|
goto out_disable;
|
|
}
|
|
|
|
dev = kzalloc(sizeof(amb_dev), GFP_KERNEL);
|
|
if (!dev) {
|
|
PRINTK (KERN_ERR, "out of memory!");
|
|
err = -ENOMEM;
|
|
goto out_release;
|
|
}
|
|
|
|
setup_dev(dev, pci_dev);
|
|
|
|
err = amb_init(dev);
|
|
if (err < 0) {
|
|
PRINTK (KERN_ERR, "adapter initialisation failure");
|
|
goto out_free;
|
|
}
|
|
|
|
setup_pci_dev(pci_dev);
|
|
|
|
// grab (but share) IRQ and install handler
|
|
err = request_irq(irq, interrupt_handler, IRQF_SHARED, DEV_LABEL, dev);
|
|
if (err < 0) {
|
|
PRINTK (KERN_ERR, "request IRQ failed!");
|
|
goto out_reset;
|
|
}
|
|
|
|
dev->atm_dev = atm_dev_register (DEV_LABEL, &pci_dev->dev, &amb_ops, -1,
|
|
NULL);
|
|
if (!dev->atm_dev) {
|
|
PRINTD (DBG_ERR, "failed to register Madge ATM adapter");
|
|
err = -EINVAL;
|
|
goto out_free_irq;
|
|
}
|
|
|
|
PRINTD (DBG_INFO, "registered Madge ATM adapter (no. %d) (%p) at %p",
|
|
dev->atm_dev->number, dev, dev->atm_dev);
|
|
dev->atm_dev->dev_data = (void *) dev;
|
|
|
|
// register our address
|
|
amb_esi (dev, dev->atm_dev->esi);
|
|
|
|
// 0 bits for vpi, 10 bits for vci
|
|
dev->atm_dev->ci_range.vpi_bits = NUM_VPI_BITS;
|
|
dev->atm_dev->ci_range.vci_bits = NUM_VCI_BITS;
|
|
|
|
init_timer(&dev->housekeeping);
|
|
dev->housekeeping.function = do_housekeeping;
|
|
dev->housekeeping.data = (unsigned long) dev;
|
|
mod_timer(&dev->housekeeping, jiffies);
|
|
|
|
// enable host interrupts
|
|
interrupts_on (dev);
|
|
|
|
out:
|
|
return err;
|
|
|
|
out_free_irq:
|
|
free_irq(irq, dev);
|
|
out_reset:
|
|
amb_reset(dev, 0);
|
|
out_free:
|
|
kfree(dev);
|
|
out_release:
|
|
pci_release_region(pci_dev, 1);
|
|
out_disable:
|
|
pci_disable_device(pci_dev);
|
|
goto out;
|
|
}
|
|
|
|
|
|
static void amb_remove_one(struct pci_dev *pci_dev)
|
|
{
|
|
struct amb_dev *dev;
|
|
|
|
dev = pci_get_drvdata(pci_dev);
|
|
|
|
PRINTD(DBG_INFO|DBG_INIT, "closing %p (atm_dev = %p)", dev, dev->atm_dev);
|
|
del_timer_sync(&dev->housekeeping);
|
|
// the drain should not be necessary
|
|
drain_rx_pools(dev);
|
|
interrupts_off(dev);
|
|
amb_reset(dev, 0);
|
|
free_irq(dev->irq, dev);
|
|
pci_disable_device(pci_dev);
|
|
destroy_queues(dev);
|
|
atm_dev_deregister(dev->atm_dev);
|
|
kfree(dev);
|
|
pci_release_region(pci_dev, 1);
|
|
}
|
|
|
|
static void __init amb_check_args (void) {
|
|
unsigned char pool;
|
|
unsigned int max_rx_size;
|
|
|
|
#ifdef DEBUG_AMBASSADOR
|
|
PRINTK (KERN_NOTICE, "debug bitmap is %hx", debug &= DBG_MASK);
|
|
#else
|
|
if (debug)
|
|
PRINTK (KERN_NOTICE, "no debugging support");
|
|
#endif
|
|
|
|
if (cmds < MIN_QUEUE_SIZE)
|
|
PRINTK (KERN_NOTICE, "cmds has been raised to %u",
|
|
cmds = MIN_QUEUE_SIZE);
|
|
|
|
if (txs < MIN_QUEUE_SIZE)
|
|
PRINTK (KERN_NOTICE, "txs has been raised to %u",
|
|
txs = MIN_QUEUE_SIZE);
|
|
|
|
for (pool = 0; pool < NUM_RX_POOLS; ++pool)
|
|
if (rxs[pool] < MIN_QUEUE_SIZE)
|
|
PRINTK (KERN_NOTICE, "rxs[%hu] has been raised to %u",
|
|
pool, rxs[pool] = MIN_QUEUE_SIZE);
|
|
|
|
// buffers sizes should be greater than zero and strictly increasing
|
|
max_rx_size = 0;
|
|
for (pool = 0; pool < NUM_RX_POOLS; ++pool)
|
|
if (rxs_bs[pool] <= max_rx_size)
|
|
PRINTK (KERN_NOTICE, "useless pool (rxs_bs[%hu] = %u)",
|
|
pool, rxs_bs[pool]);
|
|
else
|
|
max_rx_size = rxs_bs[pool];
|
|
|
|
if (rx_lats < MIN_RX_BUFFERS)
|
|
PRINTK (KERN_NOTICE, "rx_lats has been raised to %u",
|
|
rx_lats = MIN_RX_BUFFERS);
|
|
|
|
return;
|
|
}
|
|
|
|
/********** module stuff **********/
|
|
|
|
MODULE_AUTHOR(maintainer_string);
|
|
MODULE_DESCRIPTION(description_string);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_FIRMWARE("atmsar11.fw");
|
|
module_param(debug, ushort, 0644);
|
|
module_param(cmds, uint, 0);
|
|
module_param(txs, uint, 0);
|
|
module_param_array(rxs, uint, NULL, 0);
|
|
module_param_array(rxs_bs, uint, NULL, 0);
|
|
module_param(rx_lats, uint, 0);
|
|
module_param(pci_lat, byte, 0);
|
|
MODULE_PARM_DESC(debug, "debug bitmap, see .h file");
|
|
MODULE_PARM_DESC(cmds, "number of command queue entries");
|
|
MODULE_PARM_DESC(txs, "number of TX queue entries");
|
|
MODULE_PARM_DESC(rxs, "number of RX queue entries [" __MODULE_STRING(NUM_RX_POOLS) "]");
|
|
MODULE_PARM_DESC(rxs_bs, "size of RX buffers [" __MODULE_STRING(NUM_RX_POOLS) "]");
|
|
MODULE_PARM_DESC(rx_lats, "number of extra buffers to cope with RX latencies");
|
|
MODULE_PARM_DESC(pci_lat, "PCI latency in bus cycles");
|
|
|
|
/********** module entry **********/
|
|
|
|
static struct pci_device_id amb_pci_tbl[] = {
|
|
{ PCI_VDEVICE(MADGE, PCI_DEVICE_ID_MADGE_AMBASSADOR), 0 },
|
|
{ PCI_VDEVICE(MADGE, PCI_DEVICE_ID_MADGE_AMBASSADOR_BAD), 0 },
|
|
{ 0, }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(pci, amb_pci_tbl);
|
|
|
|
static struct pci_driver amb_driver = {
|
|
.name = "amb",
|
|
.probe = amb_probe,
|
|
.remove = amb_remove_one,
|
|
.id_table = amb_pci_tbl,
|
|
};
|
|
|
|
static int __init amb_module_init (void)
|
|
{
|
|
PRINTD (DBG_FLOW|DBG_INIT, "init_module");
|
|
|
|
// sanity check - cast needed as printk does not support %Zu
|
|
if (sizeof(amb_mem) != 4*16 + 4*12) {
|
|
PRINTK (KERN_ERR, "Fix amb_mem (is %lu words).",
|
|
(unsigned long) sizeof(amb_mem));
|
|
return -ENOMEM;
|
|
}
|
|
|
|
show_version();
|
|
|
|
amb_check_args();
|
|
|
|
// get the juice
|
|
return pci_register_driver(&amb_driver);
|
|
}
|
|
|
|
/********** module exit **********/
|
|
|
|
static void __exit amb_module_exit (void)
|
|
{
|
|
PRINTD (DBG_FLOW|DBG_INIT, "cleanup_module");
|
|
|
|
pci_unregister_driver(&amb_driver);
|
|
}
|
|
|
|
module_init(amb_module_init);
|
|
module_exit(amb_module_exit);
|