Commit Graph

337 Commits

Author SHA1 Message Date
Warner Losh
b64933321a Minor indenting divot... 2012-01-25 04:48:27 +00:00
Pyun YongHyeon
cbecedb2c5 TCP header size is represented by number of 32bits words.
Fix the TCP header size calculation such that makes TSO engine
cache all header(ethernet/IP/TCP) bytes to its internal buffer.
While here, remove extra pull up for TCP payload.  Unlike some
em(4) controllers, fxp(4) does not require such work around for
TSO.
The two limitations are ethernet/IP/TCP header size should be less
than or equal to the size of controller's internal buffer(80 bytes)
and these header information should be found in the first fragment
of a TSO frame.
2011-12-19 19:00:34 +00:00
Marius Strobl
112a855de7 - Follow the lead of dcphy(4) and pnphy(4) and move the reminder of the PHY
drivers that only ever attach to a particular MAC driver, i.e. inphy(4),
  ruephy(4) and xlphy(4), to the directory where the respective MAC driver
  lives and only compile it into the kernel when the latter is also there,
  also removing it from miibus.ko and moving it into the module of the
  respective MAC driver.
- While at it, rename exphy.c, which comes from NetBSD where the MAC driver
  it corresponds to also is named ex(4) instead of xl(4) but that in FreeBSD
  actually identifies itself as xlphy(4), and its function names accordingly
  for consistency.
- Additionally while at it, fix some minor style issues like whitespace
  in the register headers and add multi-inclusion protection to inphyreg.h.
2011-10-08 12:33:10 +00:00
Pyun YongHyeon
50df388d0e Enable CPUSaver D102 E-step microcode loading for 82551 revision
0x10.
2011-06-27 21:37:38 +00:00
Pyun YongHyeon
e8449b7908 Disable microcode loading for 82550 and 82550C controllers. Loading
the microcode caused SCB timeouts. Linux driver does not allow
microcode loading for these controllers and jfv also confirmed that
there is no need to do and it shouldn't.

PR:				kern/103332
Additional confirmation from:	jfv
MFC after:			1 week
2011-06-27 21:27:12 +00:00
Marius Strobl
3fcb7a5365 - Remove attempts to implement setting of BMCR_LOOP/MIIF_NOLOOP
(reporting IFM_LOOP based on BMCR_LOOP is left in place though as
  it might provide useful for debugging). For most mii(4) drivers it
  was unclear whether the PHYs driven by them actually support
  loopback or not. Moreover, typically loopback mode also needs to
  be activated on the MAC, which none of the Ethernet drivers using
  mii(4) implements. Given that loopback media has no real use (and
  obviously hardly had a chance to actually work) besides for driver
  development (which just loopback mode should be sufficient for
  though, i.e one doesn't necessary need support for loopback media)
  support for it is just dropped as both NetBSD and OpenBSD already
  did quite some time ago.
- Let mii_phy_add_media() also announce the support of IFM_NONE.
- Restructure the PHY entry points to use a structure of entry points
  instead of discrete function pointers, and extend this to include
  a "reset" entry point. Make sure any PHY-specific reset routine is
  always used, and provide one for lxtphy(4) which disables MII
  interrupts (as is done for a few other PHYs we have drivers for).
  This includes changing NIC drivers which previously just called the
  generic mii_phy_reset() to now actually call the PHY-specific reset
  routine, which might be crucial in some cases. While at it, the
  redundant checks in these NIC drivers for mii->mii_instance not being
  zero before calling the reset routines were removed because as soon
  as one PHY driver attaches mii->mii_instance is incremented and we
  hardly can end up in their media change callbacks etc if no PHY driver
  has attached as mii_attach() would have failed in that case and not
  attach a miibus(4) instance.
  Consequently, NIC drivers now no longer should call mii_phy_reset()
  directly, so it was removed from EXPORT_SYMS.
- Add a mii_phy_dev_attach() as a companion helper to mii_phy_dev_probe().
  The purpose of that function is to perform the common steps to attach
  a PHY driver instance and to hook it up to the miibus(4) instance and to
  optionally also handle the probing, addition and initialization of the
  supported media. So all a PHY driver without any special requirements
  has to do in its bus attach method is to call mii_phy_dev_attach()
  along with PHY-specific MIIF_* flags, a pointer to its PHY functions
  and the add_media set to one. All PHY drivers were updated to take
  advantage of mii_phy_dev_attach() as appropriate. Along with these
  changes the capability mask was added to the mii_softc structure so
  PHY drivers taking advantage of mii_phy_dev_attach() but still
  handling media on their own do not need to fiddle with the MII attach
  arguments anyway.
- Keep track of the PHY offset in the mii_softc structure. This is done
  for compatibility with NetBSD/OpenBSD.
- Keep track of the PHY's OUI, model and revision in the mii_softc
  structure. Several PHY drivers require this information also after
  attaching and previously had to wrap their own softc around mii_softc.
  NetBSD/OpenBSD also keep track of the model and revision on their
  mii_softc structure. All PHY drivers were updated to take advantage
  as appropriate.
- Convert the mebers of the MII data structure to unsigned where
  appropriate. This is partly inspired by NetBSD/OpenBSD.
- According to IEEE 802.3-2002 the bits actually have to be reversed
  when mapping an OUI to the MII ID registers. All PHY drivers and
  miidevs where changed as necessary. Actually this now again allows to
  largely share miidevs with NetBSD, which fixed this problem already
  9 years ago. Consequently miidevs was synced as far as possible.
- Add MIIF_NOMANPAUSE and mii_phy_flowstatus() calls to drivers that
  weren't explicitly converted to support flow control before. It's
  unclear whether flow control actually works with these but typically
  it should and their net behavior should be more correct with these
  changes in place than without if the MAC driver sets MIIF_DOPAUSE.

Obtained from:	NetBSD (partially)
Reviewed by:	yongari (earlier version), silence on arch@ and net@
2011-05-03 19:51:29 +00:00
Pyun YongHyeon
991ae908e3 Normally fxp(4) does not receive bad frames but promiscuous mode
makes controller to receive bad frames and i82557 will also receive
bad frames since fxp(4) have to receive VLAN oversized frames. If
fxp(4) encounter DMA overrun error, the received frame size would
be 0 so the actual frame size after checksum field extraction the
length would be negative(-2). Due to signed/unsigned comparison
used in driver, frame length check did not work for DMA overrun
frames. Correct this by casting it to int.
While I'm here explicitly check DMA overrun error and discard the
frame regardless of result of received frame length check.

Reported by:	n_hibma
Tested by:	n_hibma
MFC after:	1 week
2011-03-28 16:58:48 +00:00
John Baldwin
3b0a4aef96 Do a sweep of the tree replacing calls to pci_find_extcap() with calls to
pci_find_cap() instead.
2011-03-23 13:10:15 +00:00
Marius Strobl
658c839885 - Allocate the DMA memory shared between the host and the controller as
coherent.
- Update a comment to no longer reference Alpha.
2011-02-26 17:28:09 +00:00
Pyun YongHyeon
f6ff7180f8 Fix a regression introduced in r215906. The change made in r215906
caused link re-negotiation whenever application joins or leaves a
multicast group.  If driver is running, it would have established a
link so there is no need to start re-negotiation. The re-negotiation
broke established link which in turn stopped multicast application
working while re-negotiation is in progress.

PR:	kern/154667
MFC after:	1 week
2011-02-15 18:16:04 +00:00
Pyun YongHyeon
6e854927d1 If RX lockup workaround is enabled, fxp(4) will periodically reset
the controller to workaround silicon bug of i82557. Each reset will
re-establish link which in turn triggers MII status change
callback. The callback will try to reconfigure controller if the
controller is not i82557 to enable flow-control. This caused
endless link UP/DOWN when the workaround was enabled on non-i82557
controller.

To fix the issue, apply RX lockup workaround only for i82557.
Previously it blindly checked undocumented EEPROM location such
that it sometimes enabled the workaround for other controllers. At
this time, only i82557 is known to have the silicon bug.
This fixes a regression introduced in r215906 which enabled flow
control support for all controllers except i82557.

Reported by:	Karl Denninger (karl <> denninger dot net)
Tested by:	Karl Denninger (karl <> denninger dot net)
MFC after:	3 days
2010-12-02 03:53:29 +00:00
Marius Strobl
1845b5c37b Fix and implement missing parts of flow control support. This also removes
the dev.fxp.%d.noflow tunable as the same effect can now be achieved with
ifconfig(8) by setting the flowcontrol media option as desired (besides
the tunable never having a chance to actually enable flow control support
so far).
In joint forces with:	yongari
2010-11-26 21:52:33 +00:00
Marius Strobl
e0fe5c6dd3 - Sprinkle const on tables.
- Remove an alpha remnant.
- Minor comment and style fixes.
2010-11-23 21:09:42 +00:00
Pyun YongHyeon
713ca255b8 Add TSO support over VLAN for i82550/i82551. Controller requires
VLAN hardware tagging to make TSO work over VLAN. So if VLAN
hardware tagging is disabled explicitly clear TSO over VLAN. While
I'm here allow disabling VLAN TX checksum offloading.

Tested by:	Liudas < liudasb <> centras dot lt >
MFC after:	10 days
2010-10-24 21:59:51 +00:00
Marius Strobl
8e5d93dbb4 Convert the PHY drivers to honor the mii_flags passed down and convert
the NIC drivers as well as the PHY drivers to take advantage of the
mii_attach() introduced in r213878 to get rid of certain hacks. For
the most part these were:
- Artificially limiting miibus_{read,write}reg methods to certain PHY
  addresses; we now let mii_attach() only probe the PHY at the desired
  address(es) instead.
- PHY drivers setting MIIF_* flags based on the NIC driver they hang
  off from, partly even based on grabbing and using the softc of the
  parent; we now pass these flags down from the NIC to the PHY drivers
  via mii_attach(). This got us rid of all such hacks except those of
  brgphy() in combination with bce(4) and bge(4), which is way beyond
  what can be expressed with simple flags.

While at it, I took the opportunity to change the NIC drivers to pass
up the error returned by mii_attach() (previously by mii_phy_probe())
and unify the error message used in this case where and as appropriate
as mii_attach() actually can fail for a number of reasons, not just
because of no PHY(s) being present at the expected address(es).

Reviewed by:	jhb, yongari
2010-10-15 14:52:11 +00:00
Pyun YongHyeon
96486faa6e Make sure to not use stale ip/tcp header pointers. The ip/tcp
header parser uses m_pullup(9) to get access to mbuf chain.
m_pullup(9) can allocate new mbuf chain and free old one if the
space left in the mbuf chain is not enough to hold requested
contiguous bytes. Previously drivers can use stale ip/tcp header
pointer if m_pullup(9) returned new mbuf chain.

Reported by:	Andrew Boyer (aboyer <> averesystems dot com)
MFC after:	10 days
2010-10-14 18:31:40 +00:00
Pyun YongHyeon
f7a5f7371a If controller received bad frames make sure to update newly added
RFA. Also drop frames that have either CRC error or alignment
error. Normally bad frames are not received at all. But controllers
running in promiscuous mode will receive bad frames. 82557 will
also receive bad frames to receive VLAN oversized frames.

While I'm here mark RNR condition if driver happen to see RNR in
RFA status and restart RU to receive frames again. Because driver
checks all received frames in RX loop, RNR condition could be set
in the middle of RX processing. Just relying on RNR interrupt was
not enough.

This change fixes "Memory modified after free" issue when fxp(4)
is running as a member of if_bridge(4).

Tested by:	Larry Baird <lab <> gta dot com>
MFC after:	5 days
2010-05-14 17:39:28 +00:00
Pyun YongHyeon
01e3ef82d1 Dont' allow dma map load deferring. fxp(4) is not able to handle
EINPROGRESS.
2010-05-14 16:58:37 +00:00
Pyun YongHyeon
4812aef510 Controller updates RFA via DMA so driver needs synchronization.
Add missing BUS_DMASYNC_POSTWRITE and BUS_DMASYNC_PREREAD.
2010-05-14 16:55:13 +00:00
Pyun YongHyeon
8da9c50775 Export hardware MAC statistics through sysctl node. Previously
fxp(4) already used to extract most hardware MAC statistics but it
didn't show them. With this change, all MAC statistics counters
are exported. Because there are a couple of new counters for 82558
and 82559, enable extended MAC statistics functionality to get
these counters. Accoring to public data sheet, 82559 MAC statistics
return 24 DWORD counters(3 counters are unknown at this moment) so
increase MAC counter structure to meet the MAC statistics block size.
The completion of MAC counter dump is now checked against
FXP_STATS_DR_COMPLETE status code which is appended at the end of
status block. Previously fxp(4) ignored the status of the
FXP_SCB_COMMAND_CU_DUMPRESET command. fxp(4) does not wait for the
completion of pending command before issuing
FXP_SCB_COMMAND_CU_DUMPRESET. Instead it skips the command and try
it next time. This scheme may show better performance but there is
chance to loose updated counters after stopping controller. So make
sure to update MAC statistics in fxp_stop().
While I'm here move sysctl node creation to fxp_sysctl_node().

Tested by:	Larry Baird < lab <> gta dot com >
2010-05-09 22:16:15 +00:00
Pyun YongHyeon
7251782989 8255x configure command requires number of bytes of configuration
table. The default size of the configuration table was 22 bytes. To
use extended feature of 82550/82551 the configuration table size
was expanded to 32 bytes. The added configuration for 82550/82551
specifies VLAN hardware tagging and IPSec configuration as well as
TCO.
To make configuration easier fxp(4) used a configuration template
and the template was copied to configuration table. After that,
some parameters of the configuration table was changed depending on
controller type and operation mode. However the size of template
was 22 bytes so some configuration parameters were not properly
initialized on 82550/82551.
Fix this by increasing the template size. For 82557, 82558 and
82559 the size of the configuration is still 22 bytes.
2010-05-07 18:03:35 +00:00
Pyun YongHyeon
a026a25b1d It seems controller has two types of promiscuous control, one for
unicast and the other for multicast. To receive multicast frames
that host didn't join in promiscuous mode, driver have to set
promiscuous mode for multicast frames as well.
The Open Source Software Developer Manual for i8255x was not clear
how to handle promiscuous mode.

PR:		kern/145905
MFC after:	5 days
2010-05-07 16:43:00 +00:00
Pyun YongHyeon
6da6d0a9e3 With r206844, CSUM_TCP is also set for CSUM_TSO case. Modify
drivers to take into account for the change. Basically CSUM_TSO
should be checked before checking CSUM_TCP.
2010-04-19 22:10:40 +00:00
Pyun YongHyeon
829b278e5e It seems some 82559ER controllers do not support Rx checksum
offloading. Datasheet said nothing about the limitation of 82559ER
except WOL. Explicitly disable Rx checksum offloading for
controllers that is known to lack the capability.

PR:	kern/138135
Tested by:	Gooderum, Mark < mgooderum <> websense dot com >
2009-09-28 19:40:16 +00:00
Poul-Henning Kamp
6778431478 Revert previous commit and add myself to the list of people who should
know better than to commit with a cat in the area.
2009-09-08 13:19:05 +00:00
Poul-Henning Kamp
b34421bf9c Add necessary include. 2009-09-08 13:16:55 +00:00
Robert Watson
eb956cd041 Use if_maddr_rlock()/if_maddr_runlock() rather than IF_ADDR_LOCK()/
IF_ADDR_UNLOCK() across network device drivers when accessing the
per-interface multicast address list, if_multiaddrs.  This will
allow us to change the locking strategy without affecting our driver
programming interface or binary interface.

For two wireless drivers, remove unnecessary locking, since they
don't actually access the multicast address list.

Approved by:	re (kib)
MFC after:	6 weeks
2009-06-26 11:45:06 +00:00
Pyun YongHyeon
b96ad4b205 For ICH based fxp(4) controllers treat them as 82559 compatibles.
To detect which controller is ICH based one, add a new member
variable ich to struct fxp_ident and move the struct to
if_fxpvar.h. Since I've faked controller revision, don't allow
microcode loading for ICH based controllers.
With this change all ICH based controllers will have WOL and Rx
checksum offload capability.

PR:		kern/135451
Tested by:	Alexey Shuvaev ( shuvaev <> physik dot uni-wuerzburg dot de ),
		pluknet ( pluknet <> gmail dot com ),
		Gary Jennejohn ( gary.jennejohn <> freenet dot de )
2009-06-21 07:34:12 +00:00
Pyun YongHyeon
6b24912cd9 Overhaul fxp(4) multicast filter programming. fxp(4) hardwares do
not allow multicast filter programming when controller is busy to
send/receive frames. So it used to mark need_mcsetup bit and defer
multicast filter programming until controller becomes idle state.
To detect when the controller is idle fxp(4) relied on Tx
completion interrupt with NOP command and fxp_start_body and
fxp_intr_body had to see whether pending multicast filter
programming was requested. This resulted in very complex logic and
sometimes it did not work as expected.
Since the controller should be in idle state before any multicast
filter modifications I changed it to reinitialize the controller
whenever multicast filter programming is required. This is the same
way what OpenBSD and NetBSD does. Also I added IFF_DRV_RUNNING
check in ioctl handler so controller would be reinitialized only if
it is absolutely needed.
With this change I guess we can remove fxp(4) DELAY hack in ifioctl
for IPv6 case.
2009-06-21 07:17:49 +00:00
Pyun YongHyeon
c109e385f6 Always check fxp(4) is running, see if it can accept frames from
upper stack in fxp_start_body().
fxp(4) drops driver lock in Rx path so check the fxp(4) is still
running after reacquiring driver lock in Rx path. Also don't
invoke fxp_intr_body if fxp(4) is not running. With this change
there is no need to set suspend bit in device attach phase.
2009-06-21 06:46:32 +00:00
Pyun YongHyeon
43d8b117e4 Don't blindly enable Rx lock-up workaround. Newer chips do not need
the Rx lock-up workaround.

Obtained from:	NetBSD
2009-06-21 06:27:35 +00:00
Pyun YongHyeon
a996f02399 Due to possible PCI bus lock-up issues fxp(4) didn't perform full
hardware reset in attach phase. Selective reset does not clear
configured parameters so I think full hardware reset is required.
To prevent PCI bus lock-up, do selective reset first which will get
off the controller from PCI bus and request software reset after
selective reset. Software reset will unmask interrupts so disable
it after the reset.
2009-06-21 06:18:19 +00:00
Pyun YongHyeon
a2057a72e9 Introduce Rx mbuf dma tag and use it in Rx path. Previously it used
common mbuf dma tag for both Tx and Rx path but Rx buffer should
have single DMA segment and maximum buffer size of the segment
should be less than MCLBYTES.
fxp(4) also have to check Tx completion status which was updated by
DMA so we need BUS_DMASYNC_PREREAD and BUS_DMASYNC_POSTWRITE
synchronization in Tx path. Fix all misuse of bus_dmamap_sync(9) in
fxp(4). I guess this change shall fix occasional driver breakage in
PAE environments.

While I'm here add error messages of dma tag/buffer creation and
correct messages.
2009-06-21 06:06:43 +00:00
Pyun YongHyeon
5986d0d274 Controller will dma SCB command status for a given command and
driver should read updated status back after issuing a SCB command.
To send a command to controller and read updated status back,
driver should synchronize both memory read and write operations
with device. Fix bus_dmamap_sync operation specifier used in
fxp_dma_wait() by adding both memory read and memory write
operations.
2009-06-10 01:15:30 +00:00
Attilio Rao
1abcdbd127 When user_frac in the polling subsystem is low it is going to busy the
CPU for too long period than necessary.  Additively, interfaces are kept
polled (in the tick) even if no more packets are available.
In order to avoid such situations a new generic mechanism can be
implemented in proactive way, keeping track of the time spent on any
packet and fragmenting the time for any tick, stopping the processing
as soon as possible.

In order to implement such mechanism, the polling handler needs to
change, returning the number of packets processed.
While the intended logic is not part of this patch, the polling KPI is
broken by this commit, adding an int return value and the new flag
IFCAP_POLLING_NOCOUNT (which will signal that the return value is
meaningless for the installed handler and checking should be skipped).

Bump __FreeBSD_version in order to signal such situation.

Reviewed by:	emaste
Sponsored by:	Sandvine Incorporated
2009-05-30 15:14:44 +00:00
Pyun YongHyeon
0685c824ca Don't blindly set IP packet length from interface MTU in TSO case.
Remote host can advertise smaller MSS than that of sender so upper
stack might have adjusted the MSS which in turn generates IP
packets that are less size than that of interface MTU.

Reported by:	Bjoern Koenig ( bkoenig <> alpha-tierchen dot de )
Tested by:	Bjoern Koenig ( bkoenig <> alpha-tierchen dot de )
MFC after:	3 days
2009-04-13 00:32:34 +00:00
Warner Losh
155a83e87a remove now-redunant cardbus attachment. 2009-03-09 13:23:54 +00:00
Warner Losh
16ec4b00e6 writereg returns an int. 2009-02-05 19:33:35 +00:00
Pyun YongHyeon
e2157cf706 Always check whether dma map is valid before unloading the map.
When fxp(4) intializes Rx buffers for the first time, there is no
loaded dma map so attempting to unload it is an invalid operation.
2009-01-08 04:26:44 +00:00
Pyun YongHyeon
68f4ab9aa3 It seems that we don't need to reserve a TBD to set total TCP
payload length in TSO case. Leaving unused TBD also seem to cause
SCB timeouts under certain conditions when TSO/non-TSO traffics
are active at the same time.
2008-12-18 01:36:46 +00:00
Pyun YongHyeon
6d7e1582a3 mutex.h is needed here. It got it by namespace pollution.
Pointed out by:	bde
2008-12-08 03:48:03 +00:00
Pyun YongHyeon
bd4fa9d9e7 Add VLAN hardware tag insertion/stripping support. Tx/Rx checksum
offload for VLAN frames are also supported. The VLAN hardware
assistance is available only on 82550/82551 based controllers.
While I'm here change the confusing name of bit1 in byte 22 of
configuration block to vlan_drop_en. The bit controls whether
hardware strips VLAN tagged frame or not. Special thanks to wpaul
who sent valuable VLAN related information to me.

Tested on:	i386, sparc64
2008-12-02 02:30:12 +00:00
Pyun YongHyeon
af75b654d2 Make sure to clear PMDR register by writing back power management
events. Just reading PMDR register was not enough to have fxp(4)
immuninize against received magic packets during system boot.

Tested by:	Alexey Shuvaev < shuvaev <> physik DOT uni-wuerzburg DOT de >
2008-12-02 02:12:34 +00:00
Pyun YongHyeon
7137cea0c7 Add basic WOL support for 82550/82551/82558 and 82559 based
controllers. ICH based controllers are treated as 82559. 82557,
earlier revision of 82558 and 82559ER have no WOL capability.
 o WOL support requires help of a firmware so add check whether
   hardware is capable of handling magic frames by reading EEPROM.
 o Enable accepting WOL frames only when hardware is about to
   suspend or shutdown. Previously fxp(4) used to allow receipt of
   magic frame under normal operation mode which could cause
   hardware hang if magic frame is received by hardware. Datasheet
   clearly states driver should not allow WOL frames under normal
   operation mode.
 o Disable WOL frame reception in device attach so have fxp(4)
   immunize against system hang which can be triggered by magic
   packets when the hardware is not in fully initialized state.
 o Don't reset all hardware configuration data in fxp_stop()
   otherwise important configuration data is lost and this would
   reset WOL configuration to default state which in turn cause
   hardware hang on receipt of magic frames. To fix the issue,
   preserve hardware configuration data by issuing a selective
   reset.
 o Explicitly disable interrupts after issuing selective reset as
   reset may unmask interrupts.

Tested by:	Alexey Shuvaev < shuvaev <> physik DOT uni-wuerzburg DOT de >
2008-11-27 01:57:23 +00:00
Pyun YongHyeon
c21e84e4db Implement TSO for 82550/82551 controllers.
o Configure controller to use dynamic TBD as TSO requires that
   operation mode.
 o Add a dummy TBD to tx_cb_u as TSO can access one more TBD in TSO
   operation.
 o Increase a DMA segment size to 4096 to hold a full IP segment
   with link layer header.
 o Unlike other TSO capable controllers, 82550/82551 does not
   modify the first IP packet in TSO operation so driver should
   create an IP packet with proper header. Subsequent IP packets
   are generated from the header information in the first IP packet
   header. Likewise pseudo checksum also should be computed by
   driver for the first packet.
 o TSO requires one more TBD to hold total TCP payload. To make
   code simple for TSO/non-TSO case, increase the index of the
   first available TBD array.
 o Remove KASSERT that checks the size of a DMA segment should be
   less than or equal to MCLBYTES as it's no longer valid in TSO.
 o Tx threshold and number of TBDs field is used to store MSS in
   TSO. So don't set the Tx threshold in TSO case.
2008-11-26 07:36:17 +00:00
Pyun YongHyeon
f13075af2d Implement Rx checksum offload for 82559 or later controllers.
82559 or later controllers added simple checksum calculation logic
in RU. For backward compatibility the computed checksum is appended
at the end of the data posted to Rx buffer. This type of simple
checksum calculation support had been used on several vendors such
as Sun HME/GEM, SysKonnect GENESIS and Marvell Yukon controllers.
Because this type of checksum offload support requires parsing of
received frame and pseudo checksum calculation with software
routine it still consumes more CPU cycles than that of full-fledged
checksum offload controller. But it's still better than software
checksum calculation.
2008-11-26 06:36:53 +00:00
Pyun YongHyeon
8505042178 o Introduce a new function, fxp_new_rfabuf which allocates a new
Rx buffer and loads DMA map. Also add a function
   fxp_discard_rfabuf that handles reusing Rx buffer/DMA map. With
   this change fxp_add_rfabuf just handles appending a new RFA to
   existing chain.
 o Initialize mbuf length in fxp_new_rfabuf.
 o Don't reset rnr and have fxp(4) handle received frames even if
   it couldn't allocate new Rx buffer. This will make fxp(4) reload
   updated RFA under rnr case. The rnr would still be reset to 0 if
   polling is active and fxp(4) processed number of allowed Rx
   events.
 o Update if_iqdrops if fxp(4) couldn't allocate Rx buffer.

Previously fxp(4) used to try to reuse Rx buffer when new buffer
allocation is failed. But fxp(4) didn't take into account loaded
DMA map such that the same DMA map was loaded again without
unloading the map. There is no reason to unload the loaded map and
reload the same map again, just reusing the map is enough. I
believe the spare DMA map in softc was introduced to implement this
behaviour. Also fxp(4) used to stop Rx processing if once Rx buffer
allocation or DMA map load fails which in turn resulted in losing
incoming frames under heavy network load. With this change fxp(4)
should survive from resource shortage condition.
2008-11-26 05:51:49 +00:00
Pyun YongHyeon
c583cc04ef Simplify Tx checksum offload configuration. Also clear CSUM_IP if
we've computed IP checksum with software method.
2008-11-25 04:33:02 +00:00
Pyun YongHyeon
4e53f83744 - Allow fxp_encap() enqueue failed transmissions and set
IFF_DRV_OACTIVE to note resource shortage to upper stack.
- Don't count number of mbuf chains. Default 32 DMA segments for a
  frame is enough for most cases. If bus_dmamap_mbuf_sg fails use
  m_collapse(9) to collapse the mbuf chain instead of relying on
  expensive m_defrag(9).
- Move bpf handling to fxp_start_body() which is supposed to be
  more appropriate place.
- Always arm watchdog timer whenever a new Tx request is made.
  Previously fxp(4) used to arm watchdog timer only when
  FXP_CXINT_THRESH-th Tx request is made. Because fxp(4) does not
  rely on Tx interrupt to reclaim transmitted mbufs it's better to
  arm watchdog timer to detect potential lockups.
- Add more aggresive Tx buffer reclaiming in fxp_start_body to make
  room for new Tx requests. Since fxp(4) does not request Tx
  completion interrupt for every frames it's necessary to clean
  TXCBs in advance to saturate link.
- Make fxp(4) try to start more packets transmitting regardless of
  interrupt type in fxp_intr_body.
2008-11-25 04:16:16 +00:00
Pyun YongHyeon
2593534403 Move unarming watchdog timer and pending multicast configuration
check to fxp_txeof(). While I'm here unarm watchdog timer only if
there are no pending queued Tx requests.
Previously the watchdog timer was unarmed whenever Tx interrupt is
raised. This could be resulted in hiding root cause of watchdog
timeouts.
2008-11-25 02:05:01 +00:00