In practice, each RDMA device has a unique set of counters that the
hardware implements.  Having a central set of counters that they must
all adhere to is limiting and causes many useful counters to not be
available.

Therefore we create a dynamic counter registration infrastructure.

The driver must implement a stats structure allocation routine, in
which the driver must place the directory name it wants, a list of
names for all of the counters, an array of u64 counters themselves,
plus a few generic configuration options.

We then implement a core routine to create a sysfs file for each
of the named stats elements, and a core routine to retrieve the
stats when any of the sysfs attribute files are read.

To avoid excessive beating on the stats generation routine in the
drivers, the core code also caches the stats for a short period of
time so that someone attempting to read all of the stats in a
given device's directory will not result in a stats generation
call per file read.

Future work will attempt to standardize just the shared stats
elements, and possibly add a method to get the stats via netlink
in addition to sysfs.
Signed-off-by: NChristoph Lameter <cl@linux.com>
Signed-off-by: NMark Bloch <markb@mellanox.com>
Reviewed-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>
[ Add caching, make structure names more informative, add i40iw support,
  other significant rewrites from the original patch ]

The pio map initialization function is off by 1 causing the last
kernel send context that is allocated to not get mapped into the
pio map which leads to the last kernel send context not being used
by any of the qps.

The send context reserved for VL15 is taken care of by setting the
scontext variable that is used as the index into the kernel send
context array to 1 and does not need to be accounted for in the
kernel send context counting loop as it is currently done.

Fix the kernel send context counting loop to account for all the
allocated send contexts and map all of them to the different VLs.
Reviewed-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: NMike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: NJianxin Xiong <jianxin.xiong@intel.com>
Signed-off-by: NJubin John <jubin.john@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Two 8051 link settings, external device config and tuning method,
were written in the wrong location and the previous settings were
not cleared.  For both, clear the old value and write the new
value.

Fixes: 8ebd4cf1 ("staging/rdma/hfi1: Add active and optical cable support")
Reviewed-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NDean Luick <dean.luick@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

When FM is disabled, and the HFI port on the switch is
changed from MgmtAllowed=YES to MgmtAllowed=NO and the
link is bounced, FULL_MGMT_P_KEY doesn't get cleared
from the pkey table. This also occurs when the QSFP
cable is moved from a switch port with MgmtAllowed=YES
to a MgmtAllowed=NO port. Clear pkey entry properly.

Also, when the driver is loaded and the switch port is
set to MgmtAllowed=NO, FULL_MGMT_P_KEY shouldn't be added
to pkey table after FM is started. Only set FULL_MGMT_P_KEY
in the pkey table if switch port is configured to
MgmtAllowed=YES.
Reviewed-by: NDean Luick <dean.luick@intel.com>
Signed-off-by: NSebastian Sanchez <sebastian.sanchez@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Commit b9b06cb6
("IB/hfi1: Fix missing lock/unlock in verbs drain callback")
added a spin lock.

Unfortunately, the new lock code can be called from a base
level interrupt state, and an interrupt that can get stacked
will attempt to get the same lock.

Fix by using the flag save/restore spin lock variation.

Cc: stable@vger.kernel.org # 4.6+
Reviewed-by: NSebastian Sanchez <sebastian.sanchez@intel.com>
Signed-off-by: NMike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Enable trace generation for packets with the "Send Last with
Invalidate" and "Send Only with Invalidate" opcodes.
Reviewed-by: NMike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NJianxin Xiong <jianxin.xiong@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

A new union member "ieth" (Invalidate Extended Transport Header) is
added to the packet header definition in preparation of supporting
the send with invalidate opcode.
Reviewed-by: NMike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NJianxin Xiong <jianxin.xiong@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

The TODO list for the hfi1 driver was completed during 4.6. In addition
other objections raised (which are far beyond what was in the TODO list)
have been addressed as well. It is now time to remove the driver from
staging and into the drivers/infiniband sub-tree.
Reviewed-by: NJubin John <jubin.john@intel.com>
Signed-off-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Building the qib driver with gcc version 6.1.0 raises the following
build warning:
drivers/infiniband/hw/qib/qib_iba7322.c:1311:39: warning:
'qib_7322_intr_msgs' defined but not used [-Wunused-const-variable=]
 static const struct  qib_hwerror_msgs qib_7322_intr_msgs[] = {
                                       ^~~~~~~~~~~~~~~~~~
Remove the unused qib_7322_intr_msgs[]
Reviewed-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: NMike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: NJubin John <jubin.john@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Change struct ib_class_port_info to conform to IB Spec 1.3
That in order to get specific capability mask from ClassPortInfo mad.

>From the IB Spec, ClassPortInfo section:
        "CapabilityMask2 Bits 0-26: Additional class-specific capabilities...
         RespTimeValue the rest 5 bits"

The new struct now has one field for capabilitymask2 (previously was the
reserved field) and the resp_time field.

And it fixes up qib and srpt, use of the field repurposed to be used as
capabilitymask2:
IB/qib: Change pma_get_classportinfo
IB/srpt: Adjust the use of ib_class_port_info
Signed-off-by: NErez Shitrit <erezsh@mellanox.com>
Reviewed-by: NLeon Romanovsky <leonro@mellanox.com>
Reviewed-by: NHal Rosenstock <hal@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

[  598.852037] ------------[ cut here ]------------
[  598.856698] WARNING: at lib/dma-debug.c:887 check_unmap+0xf8/0x920()
[  598.863079] cxgb3 0000:01:00.0: DMA-API: device driver frees DMA memory with different size [device address=0x0000000003310000] [map size=17 bytes] [unmap size=16 bytes]
[  598.878265] Modules linked in: xprtrdma ib_isert iscsi_target_mod ib_iser libiscsi scsi_transport_iscsi ib_srpt target_core_mod ib_srp scsi_transport_srp scsi_tgt ib_ipoib rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm ib_cm iw_cm ib_sa ib_mad kvm_amd kvm ipmi_devintf ipmi_ssif dcdbas pcspkr ipmi_si sg ipmi_msghandler acpi_power_meter amd64_edac_mod shpchp edac_core sp5100_tco k10temp edac_mce_amd i2c_piix4 acpi_cpufreq nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs libcrc32c sd_mod crc_t10dif crct10dif_generic crct10dif_common ata_generic iw_cxgb3 pata_acpi ib_core ib_addr mgag200 syscopyarea sysfillrect sysimgblt i2c_algo_bit drm_kms_helper ttm pata_atiixp drm ahci libahci serio_raw i2c_core cxgb3 libata bnx2 mdio dm_mirror dm_region_hash dm_log dm_mod
[  598.946822] CPU: 3 PID: 11820 Comm: cmtime Not tainted 3.10.0-327.el7.x86_64.debug #1
[  598.954681] Hardware name: Dell Inc. PowerEdge R415/0GXH08, BIOS 2.0.2 10/22/2012
[  598.962193]  ffff8808077479a8 000000000381a432 ffff880807747960 ffffffff81700918
[  598.969663]  ffff880807747998 ffffffff8108b6c0 ffff880807747a80 ffff8808063f55c0
[  598.977132]  ffffffff833ca850 0000000000000282 ffff88080b1bb800 ffff880807747a00
[  598.984602] Call Trace:
[  598.987062]  [<ffffffff81700918>] dump_stack+0x19/0x1b
[  598.992224]  [<ffffffff8108b6c0>] warn_slowpath_common+0x70/0xb0
[  598.998254]  [<ffffffff8108b75c>] warn_slowpath_fmt+0x5c/0x80
[  599.004033]  [<ffffffff813903b8>] check_unmap+0xf8/0x920
[  599.009369]  [<ffffffff81025959>] ? sched_clock+0x9/0x10
[  599.014702]  [<ffffffff81390cee>] debug_dma_free_coherent+0x7e/0xa0
[  599.021008]  [<ffffffffa01ece2c>] cxio_destroy_cq+0xcc/0x160 [iw_cxgb3]
[  599.027654]  [<ffffffffa01e8da0>] iwch_destroy_cq+0xf0/0x140 [iw_cxgb3]
[  599.034307]  [<ffffffffa01c4bfe>] ib_destroy_cq+0x1e/0x30 [ib_core]
[  599.040601]  [<ffffffffa04ff2d2>] ib_uverbs_close+0x302/0x4d0 [ib_uverbs]
[  599.047417]  [<ffffffff812335a2>] __fput+0x102/0x310
[  599.052401]  [<ffffffff8123388e>] ____fput+0xe/0x10
[  599.057297]  [<ffffffff810bbde4>] task_work_run+0xb4/0xe0
[  599.062719]  [<ffffffff81092a84>] do_exit+0x304/0xc60
[  599.067789]  [<ffffffff81025905>] ? native_sched_clock+0x35/0x80
[  599.073820]  [<ffffffff81025959>] ? sched_clock+0x9/0x10
[  599.079153]  [<ffffffff8170a49c>] ? _raw_spin_unlock_irq+0x2c/0x50
[  599.085358]  [<ffffffff8109346c>] do_group_exit+0x4c/0xc0
[  599.090779]  [<ffffffff810a8661>] get_signal_to_deliver+0x2e1/0x960
[  599.097071]  [<ffffffff8101c497>] do_signal+0x57/0x6e0
[  599.102229]  [<ffffffff81714bd1>] ? sysret_signal+0x5/0x4e
[  599.107738]  [<ffffffff8101cb7f>] do_notify_resume+0x5f/0xb0
[  599.113418]  [<ffffffff81714e7d>] int_signal+0x12/0x17
[  599.118576] ---[ end trace 1e4653102e7e7019 ]---
[  599.123211] Mapped at:
[  599.125577]  [<ffffffff8138ed8b>] debug_dma_alloc_coherent+0x2b/0x80
[  599.131968]  [<ffffffffa01ec862>] cxio_create_cq+0xf2/0x1f0 [iw_cxgb3]
[  599.139920]  [<ffffffffa01e9c05>] iwch_create_cq+0x105/0x4e0 [iw_cxgb3]
[  599.147895]  [<ffffffffa0500584>] create_cq.constprop.14+0x184/0x2e0 [ib_uverbs]
[  599.156649]  [<ffffffffa05027fb>] ib_uverbs_create_cq+0x10b/0x140 [ib_uverbs]

Fixes: b955150e ('RDMA/cxgb3: When a user QP is marked in error, also mark the CQs in error')
Signed-off-by: NHonggang Li <honli@redhat.com>
Reviewed-by: NLeon Romanovsky <leonro@mellanox.com>
Reviewed-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Previously, mlx5_ib_cq_comp was executed from interrupt context.
Under heavy load, this could cause the CPU core to be in an interrupt
context too long.
Instead of executing the handler from the interrupt context we
execute it from a much friendly tasklet context.
Signed-off-by: NMatan Barak <matanb@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

The problem is that the function 'send_reply_to_slave' gets the
'req_sa_mad' as a pointer whose address is only aliged to 4 bytes
but is 8 bytes in size.  This can result in unaligned access faults
on certain architectures.

Sowmini Varadhan pointed to this reply from Dave Miller that say
that memcpy should not be used to solve alignment issues:
https://lkml.org/lkml/2015/10/21/352

Optimization of memcpy to 'ldx' instruction can only happen if the
compiler knows that the size of the data we are copying is 8 bytes
and it assumes it is aligned to 8 bytes. If the compiler know the
type is not aligned to 8 it must not optimize the 8 byte copy.
Defining the data type as aligned to 4 forces the compiler to treat
all accesses as though they aren't aligned and avoids the 'ldx'
optimization.

Full credit for the idea goes to Jason Gunthorpe
<jgunthorpe@obsidianresearch.com>.
Signed-off-by: NShamir Rabinovitch <shamir.rabinovitch@oracle.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Report Scatter FCS support when the Firmware supports as well.
Signed-off-by: NMajd Dibbiny <majd@mellanox.com>
Signed-off-by: NMatan Barak <matanb@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Enable Scatter FCS in the RQ context when the user passes
Scatter FCS create flag.
Signed-off-by: NMajd Dibbiny <majd@mellanox.com>
Signed-off-by: NMatan Barak <matanb@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

passing hw_stats by value requires a 280 byte copy so instead
pass it by reference is much more efficient.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Acked-by: NChien Tin Tung <chien.tin.tung@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Calling synchronize_irq() right before free_irq() is quite useless. On one
hand the IRQ can easily fire again before free_irq() is entered, on the
other hand free_irq() itself calls synchronize_irq() internally (in a race
condition free way), before any state associated with the IRQ is freed.

Patch was generated using the following semantic patch:
// <smpl>
@@
expression irq;
@@
-synchronize_irq(irq);
 free_irq(irq, ...);
// </smpl>
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Reviewed-by: NLeon Romanovsky <leonro@mellanox.com>
Acked-by: Faisal Latif <faisal.latif#intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

The i40iw_vf_cqp_ops structure is never modified, so declare it as const.

Done with the help of Coccinelle.
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Reviewed-by: NLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

By this patch, the user space library will be able to improve
performance using appropriate ringing DoorBell method according to the
memory type it asked for.

Currently only one mapping command is allowed for UARs:
MLX5_IB_MMAP_REGULAR_PAGE. Using this mapping, the kernel maps the
UARs to write-combining (WC) if the system supports it.
If the system is not supporting WC the UARs are mapped to
non-cached(NC). In this case the user space library can't tell which
mapping is applied.
This patch adds 2 new mapping commands: MLX5_IB_MMAP_WC_PAGE and
MLX5_IB_MMAP_NC_PAGE. For these commands the kernel maps exactly as
requested and fails if it can't.

Since there is no generic way to check if the requested memory region
can be mapped as WC, driver enables conclusive WC mapping only for
x86, PowerPC and ARM which support WC for the device's memory region.
Signed-off-by: NGuy Levy <guyle@mellanox.com>
Signed-off-by: NMoshe Lazer <moshel@mellanox.com>
Signed-off-by: NMatan Barak <matanb@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

The current mlx5 code disallows mapping the free running counter of
mlx5 based hardwares when PROT_EXEC is set.
Although this behaviour is correct, Linux does add an implicit VM_EXEC
to the vm_flags if the READ_IMPLIES_EXEC bit is set in the process
personality. This happens for example if the process stack is
executable.

This causes libmlx5 to output a warning and prevents the user from
reading the free running clock.
Executing the init segment of the hardware isn't a security risk
(at least no more than executing a process own stack), so we just
prevent writes to there.

Fixes: d69e3bcf ('IB/mlx5: Mmap the HCA's core clock register to
		      user-space')
Signed-off-by: NMatan Barak <matanb@mellanox.com>
Reviewed-by: NHaggai Eran <haggaie@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Simplify the code in search_relocate_mgid0_group with by using
list_for_each_entry_safe().
Signed-off-by: NGeliang Tang <geliangtang@163.com>
Reviewed-by: NLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

There is no need to duplicate a lot of code that is in the kernel library for ages.
Replace duplicating code by calling to print_hex_dump() directly.

Note that output is slightly changed:
- hex and ascii parts have just two spaces delimeter
- there is no delimeter for ascii portions
- file and line removed from prefix (they were redundant anyway since previous
  output shows same closer enough)
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: NTatyana Nikolova <tatyana.e.nikolova@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

fix spelling mistake, argumant -> argument
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Reviewed-by: NBart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

This function compiles to 550 bytes of machine code.
Three callsites, all in nes_create_qp.
Signed-off-by: NDenys Vlasenko <dvlasenk@redhat.com>
CC: Faisal Latif <faisal.latif@intel.com>
CC: Doug Ledford <dledford@redhat.com>
CC: linux-rdma@vger.kernel.org
CC: linux-kernel@vger.kernel.org
Reviewed-By: NLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Adding sq and rq drain functions, which block until all
previously posted wr-s in the specified queue have completed.
A completion object is signaled to unblock the thread,
when the last cqe for the corresponding queue is processed.
Signed-off-by: NTatyana Nikolova <tatyana.e.nikolova@intel.com>
Signed-off-by: NFaisal Latif <faisal.latif@intel.com>
Reviewed-by: NSteve Wise <swise@opengridcomputing.com>
Reviewed-by: NSteve Wise <swise@opengridcomputing.com>
Reviewed-by: NSagi Grimberg <sagi@grimberg.me>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

passing hw_stats by value requires a 280 byte copy so instead
pass it by reference is much more efficient.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Acked-by: NChien Tin Tung <chien.tin.tung@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Calling synchronize_irq() right before free_irq() is quite useless. On one
hand the IRQ can easily fire again before free_irq() is entered, on the
other hand free_irq() itself calls synchronize_irq() internally (in a race
condition free way), before any state associated with the IRQ is freed.

Patch was generated using the following semantic patch:
// <smpl>
@@
expression irq;
@@
-synchronize_irq(irq);
 free_irq(irq, ...);
// </smpl>
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Reviewed-by: NLeon Romanovsky <leonro@mellanox.com>
Acked-by: Faisal Latif <faisal.latif#intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

The i40iw_vf_cqp_ops structure is never modified, so declare it as const.

Done with the help of Coccinelle.
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Reviewed-by: NLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

__force casts should be avoided if there is a better alternative.
Hence modify the comparison of s_addr with INADDR_ANY such that the
__force cast is no longer necessary.
Signed-off-by: NBart Van Assche <bart.vanassche@sandisk.com>
Cc: Steve Wise <swise@opengridcomputing.com>
Cc: Vipul Pandya <vipul@chelsio.com>
Acked-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

These handlers when called print error message to the kernel log,
but the actual handling is done by _c4iw_free_ep() and process_timeout().
Signed-off-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Currently c4iw_peer_abort_intr() does not wake up the waiter if the
endpoint state indicates we're using MPAv2 and we're currently trying to
connect. This was introduced with commit 7c0a33d6 ("RDMA/cxgb4:
Don't wakeup threads for MPAv2")

However, this original fix is flawed because it introduces a race that
can cause a deadlock of the iwarp stack.  Here is the race:

->local side sets up an active offload connection.

->local side sends MPA_START request.

->peer sends MPA_START response.

->local side ingress cpl thread begins processing the MPA_START response,
but before it changes the state from MPA_REQ_SENT to FPDU_MODE:

->peer sends a RST which results in a ABORT_REQ_RSS.  This triggers
peer_abort_intr() which sees the state in MPA_REQ_SENT and since mpa_rev
is 2, it will avoid waking up the endpoint with -ECONNRESET, assuming the
stack will re-attempt the connection using MPAv1.

->Meanwhile, the cpl thread moves the state to FPDU_MODE and calls
c4iw_modify_rc_qp() which calls rdma_init() which sends a RI_WR/INIT WR
to firmware.  But since HW sent an abort, FW correctly drops the RI_WR/INIT
WR.

->So the cpl thread is stuck waiting for a reply and cannot process the
ABORT_REQ_RSS cpl sitting in its input queue. Thus everything comes to a
halt because no more ingress cpls are processed by the stack...

The correct fix for the issue is to always do the wake up in
c4iw_abort_intr() but reinitialize the wait object in c4iw_reconnect().

Fixes: 7c0a33d6 ("RDMA/cxgb4: Don't wakeup threads for MPAv2")
Signed-off-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Signed-off-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Add get_ep_from_stid() which will atomically find and reference the
endpoint struct if found. This avoids touch-after-free races between
threads destroying listening endpoints and the CPL processing thread
processing an incoming PASS_ACCEPT_REQ CPL.
Signed-off-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

c4iw_reject() and c4iw_accept() need to handle the case where the
endpoint has timed out and is in the middle of ABORTING the connection.

Here is the flow that causes the BUG_ON() to fire on the server side:

1) offload connection setup and endpoint timer started

2) MPA_START request received from peer, CONNECT_REQUEST passed to ULP

3) endpoint timer fires, and process_timeout() aborts the connection,
this moves the endpoint state to ABORTING until HW sends up the
ABORT_RPL_RSS.

4) application exits closing the CONNECT_REQUEST cm_id.  The IWCM calls
c4iw_reject_cr() to destroy this connection request.

5) WHAMO: BUG_ON() because the state is ABORTING.

The fix is to change c4iw_reject_cr() and c4iw_accept_cr() to fail the
operation if the state is not in MPA_REQ_RCVD vs in DEAD.
Signed-off-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

ARP failure may also happen when ep in FPDU_MODE and these failures need
to be handled by process_timeout(). process_timeout() also has to handle
case MPA_REQ_RCVD, setting abort to 1, leading to ep resource release.
Signed-off-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Arp failure for send_mpa_reply/reject() is handled by freeing the
mpa_skb in c4iw_free_ep() before releasing ep.
Signed-off-by: NHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

There is a race between ULP threads calling c4iw_ep_disconnect() via
c4iw_modify_rc_qp() and the ingress CPL thread where the ULP thread
can free the endpoint just after the ingress CPL thread finds the ep
pointer in the tid table.  To avoid this, we now use the hwtid_idr table
for lookups instead of the LLD tid table so we can lock around insert,
remove, and lookup+get_ep to avoid the race.  The CPL handlers now will
either find the ep ptr and have a ref on it, or not find it and they
can discard the CPL.  Callers of get_ep_from_tid() will have a ref
on the ep if found, and thus must deref when they are done.
Negative advice in peer_abort_intr() need to dereference the ep.
therefore peer_abort() is scheduled to dereference the ep later.
Signed-off-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

In abort_arp_failure(), the return value from c4iw_ofld_send() is
ignored and thus if the CPL isn't sent, the endpoint is stuck and never
gets aborted. Failure of c4iw_ofld_send() is treated as fatal error, and
the ep resources are released in a safer context through process_work().
Signed-off-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Moving the state to ABORTING causes the ep to get stuck because
c4iw_ep_timeout() thinks the ABORT has already been done. So leave the
state alone and let c4iw_ep_disconnect() do the right thing given the
ep state.
Signed-off-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

->In act_open_rpl(), CPL_ERR_TCAM_FULL error handling branch, there is
no handling of the return value of send_fw_act_open_req().
->In send_fw_act_open_req(), there is no handling of return value of
c4iw_l2t_send(), which may cause a ep leak and won't notify upper layers
on connection establish failure.
->send_mpa_req() should act on the return from c4iw_l2t_send() and
return the error to the caller.
->In case of c4iw_l2t_send() failure in send_mpa_req(), returns without
starting the timer and not changing the ep state, which is further
handled by act_establish()
-> In act_establish()?if send_mpa_request's get_skb returns an error,
may cause an ep leak. So handle return value of send_mpa_req()
Signed-off-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>