Many drivers initialize uselessly n_priv_flags, n_stats, testinfo_len,
eedump_len & regdump_len fields in their .get_drvinfo() ethtool op.
It's not necessary as these fields is filled in ethtool_get_drvinfo().

v2: removed unused variable
v3: removed another unused variable
Signed-off-by: NIvan Vecera <ivecera@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The Kconfig currently controlling compilation of this code is:

drivers/net/ethernet/ti/Kconfig:config TI_CPSW_PHY_SEL
drivers/net/ethernet/ti/Kconfig:        bool "TI CPSW Switch Phy sel Support"

...meaning that it currently is not being built as a module by anyone.

Lets remove the couple traces of modularity so that when reading the
driver there is no doubt it is builtin-only.

Since module_platform_driver() uses the same init level priority as
builtin_platform_driver() the init ordering remains unchanged with
this commit.

Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code.

We also delete the MODULE_LICENSE tag etc. since all that information
was (or is now) contained at the top of the file in the comments.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Varka Bhadram <varkabhadram@gmail.com>
Cc: netdev@vger.kernel.org
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

In case the DaVinci Emac is directly connected to a
non-mdio PHY/device, it should be possible to provide
a fixed link configuration in the DT.
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Tested-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

A deadlock trace is seen in netcp driver with lockup detector enabled.
The trace log is provided below for reference. This patch fixes the
bug by removing the usage of netcp_modules_lock within ndo_ops functions.
ndo_{open/close/ioctl)() is already called with rtnl_lock held. So there
is no need to hold another mutex for serialization across processes on
multiple cores.  So remove use of netcp_modules_lock mutex from these
ndo ops functions.

ndo_set_rx_mode() shouldn't be using a mutex as it is called from atomic
context. In the case of ndo_set_rx_mode(), there can be call to this API
without rtnl_lock held from an atomic context. As the underlying modules
are expected to add address to a hardware table, it is to be protected
across concurrent updates and hence a spin lock is used to synchronize
the access. Same with ndo_vlan_rx_add_vid() & ndo_vlan_rx_kill_vid().

Probably the netcp_modules_lock is used to protect the module not being
removed as part of rmmod. Currently this is not fully implemented and
assumes the interface is brought down before doing rmmod of modules.
The support for rmmmod while interface is up is expected in a future
patch set when additional modules such as pa, qos are added. For now
all of the tests such as if up/down, reboot, iperf works fine with this
patch applied.

Deadlock trace seen with lockup detector enabled is shown below for
reference.

[   16.863014] ======================================================
[   16.869183] [ INFO: possible circular locking dependency detected ]
[   16.875441] 4.1.6-01265-gfb1e101 #1 Tainted: G        W
[   16.881176] -------------------------------------------------------
[   16.887432] ifconfig/1662 is trying to acquire lock:
[   16.892386]  (netcp_modules_lock){+.+.+.}, at: [<c03e8110>]
netcp_ndo_open+0x168/0x518
[   16.900321]
[   16.900321] but task is already holding lock:
[   16.906144]  (rtnl_mutex){+.+.+.}, at: [<c053a418>] devinet_ioctl+0xf8/0x7e4
[   16.913206]
[   16.913206] which lock already depends on the new lock.
[   16.913206]
[   16.921372]
[   16.921372] the existing dependency chain (in reverse order) is:
[   16.928844]
-> #1 (rtnl_mutex){+.+.+.}:
[   16.932865]        [<c06023f0>] mutex_lock_nested+0x68/0x4a8
[   16.938521]        [<c04c5758>] register_netdev+0xc/0x24
[   16.943831]        [<c03e65c0>] netcp_module_probe+0x214/0x2ec
[   16.949660]        [<c03e8a54>] netcp_register_module+0xd4/0x140
[   16.955663]        [<c089654c>] keystone_gbe_init+0x10/0x28
[   16.961233]        [<c000977c>] do_one_initcall+0xb8/0x1f8
[   16.966714]        [<c0867e04>] kernel_init_freeable+0x148/0x1e8
[   16.972720]        [<c05f9994>] kernel_init+0xc/0xe8
[   16.977682]        [<c0010038>] ret_from_fork+0x14/0x3c
[   16.982905]
-> #0 (netcp_modules_lock){+.+.+.}:
[   16.987619]        [<c006eab0>] lock_acquire+0x118/0x320
[   16.992928]        [<c06023f0>] mutex_lock_nested+0x68/0x4a8
[   16.998582]        [<c03e8110>] netcp_ndo_open+0x168/0x518
[   17.004064]        [<c04c48f0>] __dev_open+0xa8/0x10c
[   17.009112]        [<c04c4b74>] __dev_change_flags+0x94/0x144
[   17.014853]        [<c04c4c3c>] dev_change_flags+0x18/0x48
[   17.020334]        [<c053a9fc>] devinet_ioctl+0x6dc/0x7e4
[   17.025729]        [<c04a59ec>] sock_ioctl+0x1d0/0x2a8
[   17.030865]        [<c0142844>] do_vfs_ioctl+0x41c/0x688
[   17.036173]        [<c0142ae4>] SyS_ioctl+0x34/0x5c
[   17.041046]        [<c000ff60>] ret_fast_syscall+0x0/0x54
[   17.046441]
[   17.046441] other info that might help us debug this:
[   17.046441]
[   17.054434]  Possible unsafe locking scenario:
[   17.054434]
[   17.060343]        CPU0                    CPU1
[   17.064862]        ----                    ----
[   17.069381]   lock(rtnl_mutex);
[   17.072522]                                lock(netcp_modules_lock);
[   17.078875]                                lock(rtnl_mutex);
[   17.084532]   lock(netcp_modules_lock);
[   17.088366]
[   17.088366]  *** DEADLOCK ***
[   17.088366]
[   17.094279] 1 lock held by ifconfig/1662:
[   17.098278]  #0:  (rtnl_mutex){+.+.+.}, at: [<c053a418>]
devinet_ioctl+0xf8/0x7e4
[   17.105774]
[   17.105774] stack backtrace:
[   17.110124] CPU: 1 PID: 1662 Comm: ifconfig Tainted: G        W
4.1.6-01265-gfb1e101 #1
[   17.118637] Hardware name: Keystone
[   17.122123] [<c00178e4>] (unwind_backtrace) from [<c0013cbc>]
(show_stack+0x10/0x14)
[   17.129862] [<c0013cbc>] (show_stack) from [<c05ff450>]
(dump_stack+0x84/0xc4)
[   17.137079] [<c05ff450>] (dump_stack) from [<c0068e34>]
(print_circular_bug+0x210/0x330)
[   17.145161] [<c0068e34>] (print_circular_bug) from [<c006ab7c>]
(validate_chain.isra.35+0xf98/0x13ac)
[   17.154372] [<c006ab7c>] (validate_chain.isra.35) from [<c006da60>]
(__lock_acquire+0x52c/0xcc0)
[   17.163149] [<c006da60>] (__lock_acquire) from [<c006eab0>]
(lock_acquire+0x118/0x320)
[   17.171058] [<c006eab0>] (lock_acquire) from [<c06023f0>]
(mutex_lock_nested+0x68/0x4a8)
[   17.179140] [<c06023f0>] (mutex_lock_nested) from [<c03e8110>]
(netcp_ndo_open+0x168/0x518)
[   17.187484] [<c03e8110>] (netcp_ndo_open) from [<c04c48f0>]
(__dev_open+0xa8/0x10c)
[   17.195133] [<c04c48f0>] (__dev_open) from [<c04c4b74>]
(__dev_change_flags+0x94/0x144)
[   17.203129] [<c04c4b74>] (__dev_change_flags) from [<c04c4c3c>]
(dev_change_flags+0x18/0x48)
[   17.211560] [<c04c4c3c>] (dev_change_flags) from [<c053a9fc>]
(devinet_ioctl+0x6dc/0x7e4)
[   17.219729] [<c053a9fc>] (devinet_ioctl) from [<c04a59ec>]
(sock_ioctl+0x1d0/0x2a8)
[   17.227378] [<c04a59ec>] (sock_ioctl) from [<c0142844>]
(do_vfs_ioctl+0x41c/0x688)
[   17.234939] [<c0142844>] (do_vfs_ioctl) from [<c0142ae4>]
(SyS_ioctl+0x34/0x5c)
[   17.242242] [<c0142ae4>] (SyS_ioctl) from [<c000ff60>]
(ret_fast_syscall+0x0/0x54)
[   17.258855] netcp-1.0 2620110.netcp eth0: Link is Up - 1Gbps/Full - flow
control off
[   17.271282] BUG: sleeping function called from invalid context at
kernel/locking/mutex.c:616
[   17.279712] in_atomic(): 1, irqs_disabled(): 0, pid: 1662, name: ifconfig
[   17.286500] INFO: lockdep is turned off.
[   17.290413] Preemption disabled at:[<  (null)>]   (null)
[   17.295728]
[   17.297214] CPU: 1 PID: 1662 Comm: ifconfig Tainted: G        W
4.1.6-01265-gfb1e101 #1
[   17.305735] Hardware name: Keystone
[   17.309223] [<c00178e4>] (unwind_backtrace) from [<c0013cbc>]
(show_stack+0x10/0x14)
[   17.316970] [<c0013cbc>] (show_stack) from [<c05ff450>]
(dump_stack+0x84/0xc4)
[   17.324194] [<c05ff450>] (dump_stack) from [<c06023b0>]
(mutex_lock_nested+0x28/0x4a8)
[   17.332112] [<c06023b0>] (mutex_lock_nested) from [<c03e9840>]
(netcp_set_rx_mode+0x160/0x210)
[   17.340724] [<c03e9840>] (netcp_set_rx_mode) from [<c04c483c>]
(dev_set_rx_mode+0x1c/0x28)
[   17.348982] [<c04c483c>] (dev_set_rx_mode) from [<c04c490c>]
(__dev_open+0xc4/0x10c)
[   17.356724] [<c04c490c>] (__dev_open) from [<c04c4b74>]
(__dev_change_flags+0x94/0x144)
[   17.364729] [<c04c4b74>] (__dev_change_flags) from [<c04c4c3c>]
(dev_change_flags+0x18/0x48)
[   17.373166] [<c04c4c3c>] (dev_change_flags) from [<c053a9fc>]
(devinet_ioctl+0x6dc/0x7e4)
[   17.381344] [<c053a9fc>] (devinet_ioctl) from [<c04a59ec>]
(sock_ioctl+0x1d0/0x2a8)
[   17.388994] [<c04a59ec>] (sock_ioctl) from [<c0142844>]
(do_vfs_ioctl+0x41c/0x688)
[   17.396563] [<c0142844>] (do_vfs_ioctl) from [<c0142ae4>]
(SyS_ioctl+0x34/0x5c)
[   17.403873] [<c0142ae4>] (SyS_ioctl) from [<c000ff60>]
(ret_fast_syscall+0x0/0x54)
[   17.413772] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
udhcpc (v1.20.2) started
Sending discover...
[   18.690666] netcp-1.0 2620110.netcp eth0: Link is Up - 1Gbps/Full - flow
control off
Sending discover...
[   22.250972] netcp-1.0 2620110.netcp eth0: Link is Up - 1Gbps/Full - flow
control off
[   22.258721] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   22.265458] BUG: sleeping function called from invalid context at
kernel/locking/mutex.c:616
[   22.273896] in_atomic(): 1, irqs_disabled(): 0, pid: 342, name: kworker/1:1
[   22.280854] INFO: lockdep is turned off.
[   22.284767] Preemption disabled at:[<  (null)>]   (null)
[   22.290074]
[   22.291568] CPU: 1 PID: 342 Comm: kworker/1:1 Tainted: G        W
4.1.6-01265-gfb1e101 #1
[   22.300255] Hardware name: Keystone
[   22.303750] Workqueue: ipv6_addrconf addrconf_dad_work
[   22.308895] [<c00178e4>] (unwind_backtrace) from [<c0013cbc>]
(show_stack+0x10/0x14)
[   22.316643] [<c0013cbc>] (show_stack) from [<c05ff450>]
(dump_stack+0x84/0xc4)
[   22.323867] [<c05ff450>] (dump_stack) from [<c06023b0>]
(mutex_lock_nested+0x28/0x4a8)
[   22.331786] [<c06023b0>] (mutex_lock_nested) from [<c03e9840>]
(netcp_set_rx_mode+0x160/0x210)
[   22.340394] [<c03e9840>] (netcp_set_rx_mode) from [<c04c9d18>]
(__dev_mc_add+0x54/0x68)
[   22.348401] [<c04c9d18>] (__dev_mc_add) from [<c05ab358>]
(igmp6_group_added+0x168/0x1b4)
[   22.356580] [<c05ab358>] (igmp6_group_added) from [<c05ad2cc>]
(ipv6_dev_mc_inc+0x4f0/0x5a8)
[   22.365019] [<c05ad2cc>] (ipv6_dev_mc_inc) from [<c058f0d0>]
(addrconf_dad_work+0x21c/0x33c)
[   22.373460] [<c058f0d0>] (addrconf_dad_work) from [<c0042850>]
(process_one_work+0x214/0x8d0)
[   22.381986] [<c0042850>] (process_one_work) from [<c0042f54>]
(worker_thread+0x48/0x4bc)
[   22.390071] [<c0042f54>] (worker_thread) from [<c004868c>]
(kthread+0xf0/0x108)
[   22.397381] [<c004868c>] (kthread) from [<c0010038>]

Trace related to incorrect usage of mutex inside ndo_set_rx_mode

[   24.086066] BUG: sleeping function called from invalid context at
kernel/locking/mutex.c:616
[   24.094506] in_atomic(): 1, irqs_disabled(): 0, pid: 1682, name: ifconfig
[   24.101291] INFO: lockdep is turned off.
[   24.105203] Preemption disabled at:[<  (null)>]   (null)
[   24.110511]
[   24.112005] CPU: 2 PID: 1682 Comm: ifconfig Tainted: G        W
4.1.6-01265-gfb1e101 #1
[   24.120518] Hardware name: Keystone
[   24.124018] [<c00178e4>] (unwind_backtrace) from [<c0013cbc>]
(show_stack+0x10/0x14)
[   24.131772] [<c0013cbc>] (show_stack) from [<c05ff450>]
(dump_stack+0x84/0xc4)
[   24.138989] [<c05ff450>] (dump_stack) from [<c06023b0>]
(mutex_lock_nested+0x28/0x4a8)
[   24.146908] [<c06023b0>] (mutex_lock_nested) from [<c03e9840>]
(netcp_set_rx_mode+0x160/0x210)
[   24.155523] [<c03e9840>] (netcp_set_rx_mode) from [<c04c483c>]
(dev_set_rx_mode+0x1c/0x28)
[   24.163787] [<c04c483c>] (dev_set_rx_mode) from [<c04c490c>]
(__dev_open+0xc4/0x10c)
[   24.171531] [<c04c490c>] (__dev_open) from [<c04c4b74>]
(__dev_change_flags+0x94/0x144)
[   24.179528] [<c04c4b74>] (__dev_change_flags) from [<c04c4c3c>]
(dev_change_flags+0x18/0x48)
[   24.187966] [<c04c4c3c>] (dev_change_flags) from [<c053a9fc>]
(devinet_ioctl+0x6dc/0x7e4)
[   24.196145] [<c053a9fc>] (devinet_ioctl) from [<c04a59ec>]
(sock_ioctl+0x1d0/0x2a8)
[   24.203803] [<c04a59ec>] (sock_ioctl) from [<c0142844>]
(do_vfs_ioctl+0x41c/0x688)
[   24.211373] [<c0142844>] (do_vfs_ioctl) from [<c0142ae4>]
(SyS_ioctl+0x34/0x5c)
[   24.218676] [<c0142ae4>] (SyS_ioctl) from [<c000ff60>]
(ret_fast_syscall+0x0/0x54)
[   24.227156] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
Signed-off-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Currently netcp_rxpool_refill() that refill descriptors and attached
buffers to fdq while interrupt is enabled as part of NAPI poll. Doing
it while interrupt is disabled could be beneficial as hardware will
not be starved when CPU is busy with processing interrupt.
Signed-off-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Currently netcp_module_probe() doesn't check the return value of
of_parse_phandle() that points to the interface data for the
module and then pass the node ptr to the module which is incorrect.
Check for return value and free the intf_modpriv if there is error.
Signed-off-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Currently, if netcp_allocate_rx_buf() fails due no descriptors
in the rx free descriptor queue, inside the netcp_rxpool_refill() function
the iterative loop to fill buffers doesn't terminate right away. So modify
the netcp_allocate_rx_buf() to return an error code and use it break the
loop when there is error.
Signed-off-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The netcp interface is not fully initialized before attach the module
to the interface. For example, the tx pipe/rx pipe is initialized
in ethss module as part of attach(). So until this is complete, the
interface can't be registered.  So move registration of interface to
net device outside the current loop that attaches the modules to the
interface.
Signed-off-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

netcp_core is the first driver that will get initialized and the modules
(ethss, pa etc) will then get initialized. So the code at the end of
netcp_probe() that iterate over the modules is a dead code as the module
list will be always be empty. So remove this code.
Signed-off-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

On K2HK, sgmii module registers of slave 0 and 1 are mem
mapped to one contiguous block, while those of slave 2
and 3 are mapped to another contiguous block.  However,
on K2E and K2L, sgmii module registers of all slaves are
mem mapped to one contiguous block.  SGMII APIs expect
slave 0 sgmii base when API is invoked for slave 0 and 1,
and slave 2 sgmii base when invoked for other slaves.
Before this patch, slave 0 sgmii base is always passed to
sgmii API for K2E regardless which slave is the API invoked
for.  This patch fixes the problem.
Signed-off-by: NWingMan Kwok <w-kwok2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Adding support for reading mac address using syscon driver for
dra7 and am437x platforms
Signed-off-by: NMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Moving mac address reading from ethernet driver to common
file for better maintenance and for code reusable.
Signed-off-by: NMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

In DRA72x EVM, by default slave 1 is connected to the onboard
phy, but slave 2 pins are also muxed with video input module
which is controlled by pcf857x gpio and currently to select slave
0 to connect to phy gpio hogging is used, but with
omap2plus_defconfig the pcf857x gpio is built as module. So when
using NFS on DRA72x EVM, board doesn't boot as gpio hogging do
not set proper gpio state to connect slave 0 to phy as it is
built as module and you do not see any errors for not setting
gpio and just mentions dhcp reply not got.

To solve this issue, introducing "mode-gpios" in DT when gpio
based muxing is required. This will throw a warning when gpio
get fails and returns probe defer. When gpio-pcf857x module is
installed, cpsw probes again and ethernet becomes functional.
Verified this on DRA72x with pcf as module and ramdisk.
Signed-off-by: NMugunthan V N <mugunthanvnm@ti.com>
Acked-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Currently CONFIG_ARCH_HAVE_CUSTOM_GPIO_H is defined for all MIPS
machines, and each machine type provides its own gpio.h. However
only a handful really implement the GPIO API, most just forward
everythings to gpiolib.

The Alchemy machine is notable as it provides a system to allow
implementing the GPIO API at the board level. But it is not used by
any board currently supported, so it can also be removed.

For most machine types we can just remove the custom gpio.h, as well
as the custom wrappers if some exists. Some of the code found in
the wrappers must be moved to the respective GPIO driver.

A few more fixes are need in some drivers as they rely on linux/gpio.h
to provides some machine specific definitions, or used asm/gpio.h
instead of linux/gpio.h for the gpio API.
Signed-off-by: NAlban Bedel <albeu@free.fr>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Cc: linux-mips@linux-mips.org
Cc: Hauke Mehrtens <hauke@hauke-m.de>
Cc: Rafał Miłecki <zajec5@gmail.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Florian Fainelli <florian@openwrt.org>
Cc: Manuel Lauss <manuel.lauss@gmail.com>
Cc: Joe Perches <joe@perches.com>
Cc: Daniel Walter <dwalter@google.com>
Cc: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: James Hartley <james.hartley@imgtec.com>
Cc: Andrew Bresticker <abrestic@chromium.org>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Varka Bhadram <varkabhadram@gmail.com>
Cc: Masanari Iida <standby24x7@gmail.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Michael Buesch <m@bues.ch>
Cc: abdoulaye berthe <berthe.ab@gmail.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-ide@vger.kernel.org
Cc: linux-gpio@vger.kernel.org
Cc: linux-input@vger.kernel.org
Cc: netdev@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/10828/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Propagate error code on failure.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier ret; expression e1,e2;
@@
(
if (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}
// </smpl>
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

As per Am335x Errata [1] Advisory 1.0.9, The CPSW C0_TX_PEND and
C0_RX_PEND interrupt outputs provide a single transmit interrupt
that combines transmit channel interrupts TXPEND[7:0] and a
single receive interrupt that combines receive channel interrupts
RXPEND[7:0]. The TXPEND[0] and RXPEND[0] interrupt outputs are
connected to the ARM Cortex-A8 interrupt controller (INTC) rather
than the C0_TX_PEND and C0_RX_PEND interrupt outputs. So even
though CPSW interrupt is cleared by writing appropriate values to
EOI register the interrupt is not cleared in IRQ controller. So
interrupt is still pending and CPU is struck in ISR, the
workaround is to disable the interrupts in ARM irq controller.

[1] http://www.ti.com/lit/er/sprz360f/sprz360f.pdfSigned-off-by: NMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Prior to this patch, rx buffer size for each rx queue
of an interface is configurable through dts bindings.
But for an interface, the first rx queue's rx buffer
size is always the usual MTU size (plus usual overhead)
and page size for the remaining rx queues (if they are
enabled by specifying a non-zero rx queue depth dts
binding of the corresponding interface).  This patch
removes the rx buffer size configuration capability.
Signed-off-by: NWingMan Kwok <w-kwok2@ti.com>
Acked-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Instead of processing tx events in isr adding separate napi for
tx which improves performance by ~180Mbps with
omap2plus_defconfig on DRA74x platform. Also cleaning up rx napis
by renaming to napi_rx for better understanding the code.
Signed-off-by: NMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Since interrupt is shared between the two ethernet interface and
in isr only one napi is scheduled at an instance so having two
napis doesn't make any difference. So making napi also as a
common resource for the dual ethernet interfaces.
Signed-off-by: NMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

CPSW interrupts can be disabled by masking CPSW interrupts and
clearing interrupt by writing appropriate EOI. So removing all
disable_irq/enable_irq as discussed in [1]

[1] http://patchwork.ozlabs.org/patch/492741/Signed-off-by: NMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch clean up error handle code to use goto label properly. In some
cases, the code unnecessarily use goto instead of just returning the error
code.  Code also make explicit calls to devm_* APIs on error which is
not necessary. In the gbe_remove() also it makes similar calls which is
also unnecessary.

Also fix few checkpatch warnings
Signed-off-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The code seems to assume a null is returned when the list is empty
from first_sec_slave() to break the loop which is incorrect. Fix the
code by using list_empty().
Signed-off-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Currently if user do rmmod keystone_netcp.ko following warning is
seen :-

[   59.035891] ------------[ cut here ]------------
[   59.040535] WARNING: CPU: 2 PID: 1619 at drivers/net/ethernet/ti/
netcp_core.c:2127 netcp_remove)

This is because the interface list is not cleaned up in netcp_remove.
This patch fixes this. Also fix some checkpatch related warnings.
Signed-off-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

On some of the K2E and K2L platforms, the two DWORDs in
efuse occupied by the pre-programmed mac address for
slave port 1 are swapped.  To workaround this issue,
this patch adds a new define NETCP_EFUSE_ADDR_SWAP (2)
which signifies the occurrence of such swapping so that
the driver can take proper action.  The flag can be
enabled in the corresponding netcp interface dts binding
as efuse-mac = <2>  under the corresponding netcp
interface node.
Signed-off-by: NWingMan Kwok <w-kwok2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch asserts SGMII RTRESET, i.e. resetting the SGMII Tx/Rx
logic,  during network interface shutdown to avoid having the
hardware wedge when shutting down with high incoming traffic rates.
This is cleared (brought out of RTRESET) when the interface is
brought back up.
Signed-off-by: NWingMan Kwok <w-kwok2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch adds the missing statistics for the host
and slave ports of the CPSW on K2L and K2E platforms.
Signed-off-by: NWingMan Kwok <w-kwok2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

In certain applications it's beneficial to allow the CPSW h/w
stats counters to continue to increment even while the kernel
polls them. This patch implements this behavior for both 1G
and 10G ethernet subsystem modules.
Signed-off-by: NWingMan Kwok <w-kwok2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Different Keystone2 platforms have different number and
layouts of hw statistics modules.  This patch consolidates
the statistics processing of different Keystone2 platforms
for easy maintenance.
Signed-off-by: NWingMan Kwok <w-kwok2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The CPSW driver keeps internally some, but not all, of
the statistics available in the hw statistics modules.  Furthermore,
some of the locations in the hw statistics modules are reserved and
contain no useful information.  Prior to this patch, the driver
allocates memory of the size of the the whole hw statistics modules,
instead of the size of statistics-entries-interested-in (i.e. et_stats),
for internal storage.  This patch fixes that.
Signed-off-by: NWingMan Kwok <w-kwok2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch fixes error in the setting of the hw statistics
module base for K2HK platform.  In K2HK although there are
4 hw statistics modules, but only 2 are visible at a time.
Thus when setting up the pointers to the base of the
corresponding hw statistics modules, modules 0 and 2 should
point to one base, while modules 1 and 3 should point to the
other.
Signed-off-by: NWingMan Kwok <w-kwok2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch fixes a bug in which the timer routine synchronized
against the ethtool-triggered statistics updates with spin_lock_bh().
A timer function is itself a bottom-half, so this should be
spin_lock().
Signed-off-by: NWingMan Kwok <w-kwok2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

With commit c03abd84 ("net: ethernet: cpsw: don't requests IRQs
we don't use") common isr and napi are separated into separate tx isr
and rx isr/napi, but still in rx napi tx events are handled. So removing
the tx event handling in rx napi.
Signed-off-by: NMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The keystone qmss will raise interrupt when packet arrive at the
receive queue. Only control available to avoid interrupt from happening
is to keep the free descriptor queue (FDQ) empty in the receive side.
So the filling of descriptors into the FDQ has to happen after
request_irq() call is made as part of knav_queue_enable_notify(). So
move the function netcp_rxpool_refill() after this call.
Signed-off-by: NMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

platform_driver does not need to set an owner because
platform_driver_register() will set it.
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

In commit 'c03abd84 ("net: ethernet: cpsw: don't requests
IRQs we don't use")', common isr is split into tx and rx, but
in rx isr tx interrupt is also disabledi in cpsw_disable_irq().
So tx interrupts are not handled during rx interrupts and rx
napi completion and results in poor tx performance by 40Mbps.
Fixing by disabling only rx interrupt in rx isr.

Cc: Felipe Balbi <balbi@ti.com>
Cc: <stable@vger.kernel.org> # v4.0+
Signed-off-by: NMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

When cpsw's number of slave is set to 1 in device tree and while
accessing second slave ndev and priv in cpsw_tx_interrupt(),
there is a kernel crash. This is due to cpsw_get_slave_priv()
not verifying number of slaves while retriving netdev priv and
returns a invalid memory region. Fixing the issue by introducing
number of slave check in cpsw_get_slave_priv() and
cpsw_get_slave_ndev().

[   15.879589] Unable to handle kernel paging request at virtual address 0f0e142c
[   15.888540] pgd = ed374000
[   15.891359] [0f0e142c] *pgd=00000000
[   15.895105] Internal error: Oops: 5 [#1] SMP ARM
[   15.899936] Modules linked in:
[   15.903139] CPU: 0 PID: 593 Comm: udhcpc Tainted: G        W       4.1.0-12205-gfda8b18c-dirty #10
[   15.912386] Hardware name: Generic AM43 (Flattened Device Tree)
[   15.918557] task: ed2a2e00 ti: ed3fe000 task.ti: ed3fe000
[   15.924187] PC is at cpsw_tx_interrupt+0x30/0x44
[   15.929008] LR is at _raw_spin_unlock_irqrestore+0x40/0x44
[   15.934726] pc : [<c048b9cc>]    lr : [<c05ef4f4>]    psr: 20000193
[   15.934726] sp : ed3ffc08  ip : ed2a2e40  fp : 00000000
[   15.946685] r10: c0969ce8  r9 : c0969cfc  r8 : 00000000
[   15.952129] r7 : 000000c6  r6 : ee54ab00  r5 : ee169c64  r4 : ee534e00
[   15.958932] r3 : 0f0e0d0c  r2 : 00000000  r1 : ed3ffbc0  r0 : 00000001
[   15.965735] Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
[   15.973261] Control: 10c5387d  Table: ad374059  DAC: 00000015
[   15.979246] Process udhcpc (pid: 593, stack limit = 0xed3fe218)
[   15.985414] Stack: (0xed3ffc08 to 0xed400000)
[   15.989954] fc00:                   ee54ab00 c009928c c0a9e648 60000193 000032e4 ee169c00
[   15.998478] fc20: ee169c64 ee169c00 ee169c64 ee54ab00 00000001 00000001 ee67e268 ee008800
[   16.006995] fc40: ee534800 c009946c ee169c00 ee169c64 c08bd660 c009c370 c009c2a4 000000c6
[   16.015513] fc60: c08b75c4 c08b0854 00000000 c0098b3c 000000c6 c0098c50 ed3ffcb0 0000003a
[   16.024033] fc80: ed3ffcb0 fa24010c c08b7800 fa240100 ee7e9880 c00094c4 c05ef4e8 60000013
[   16.032556] fca0: ffffffff ed3ffce4 ee7e9880 c05ef964 00000001 ed2a33d8 00000000 ed2a2e00
[   16.041080] fcc0: 60000013 ee536bf8 60000013 ee51b800 ee7e9880 ee67e268 ee7e9880 ee534800
[   16.049603] fce0: c0ad0768 ed3ffcf8 c008e910 c05ef4e8 60000013 ffffffff 00000001 00000001
[   16.058121] fd00: ee536bf8 c0487a04 00000000 00000000 ee534800 00000000 00000156 c048c990
[   16.066645] fd20: 00000000 00000000 c0969f40 00000000 00000000 c05000e8 00000001 00000000
[   16.075167] fd40: 00000000 c051eefc 00000000 ee67e268 00000000 00000000 ee51b800 ed3ffd9c
[   16.083690] fd60: 00000000 ee67e200 ee51b800 ee7e9880 ee67e268 00000000 00000000 ee67e200
[   16.092211] fd80: ee51b800 ee7e9880 ee67e268 ee534800 ee67e200 c051eedc ee67e268 00000010
[   16.100727] fda0: 00000000 00000000 ee7e9880 ee534800 00000000 ee67e268 ee51b800 c05006fc
[   16.109247] fdc0: ee67e268 00000001 c0500488 00000156 ee7e9880 00000000 ed3fe000 fffffff4
[   16.117771] fde0: ed3fff1c ee7e9880 ee534800 00000148 00000000 ed1f8340 00000000 00000000
[   16.126289] fe00: 00000000 c05a9054 00000000 00000000 00000156 c0ab62a8 00000010 ed3e7000
[   16.134812] fe20: 00000000 00000008 edcfb700 ed3fff1c c0fb5f94 ed2a2e00 c0fb5f64 000005d8
[   16.143336] fe40: c0a9b3b8 00000000 ed3e7070 00000000 00000000 00000000 00009f40 00000000
[   16.151858] fe60: 00000000 00020022 00110008 00000000 00000000 43004400 00000000 ffffffff
[   16.160374] fe80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   16.168898] fea0: edcfb700 bee5f380 00000014 00000000 ed3fe000 00000000 00004400 c04e2b64
[   16.177415] fec0: 00000002 c04e3b00 ed3ffeec 00000001 0000011a 00000000 00000000 bee5f394
[   16.185937] fee0: 00000148 ed3fff10 00000014 00000001 00000000 00000000 ed3ffee4 00000000
[   16.194459] ff00: 00000000 00000000 00000000 c04e3664 00080011 00000002 06000000 ffffffff
[   16.202980] ff20: 0000ffff ffffffff 0000ffff c008dd54 ee5a6f08 ee636e80 c096972d c0089c14
[   16.211499] ff40: 00000000 60000013 ee5a6f40 60000013 00000000 ee5a6f40 00000002 00000006
[   16.220023] ff60: 00000000 edcfb700 00000001 ed2a2e00 c000f60c 00000001 0000011a c008ea34
[   16.228540] ff80: 00000006 00000000 bee5f380 00000014 bee5f380 00000014 bee5f380 00000122
[   16.237059] ffa0: c000f7c4 c000f5e0 bee5f380 00000014 00000006 bee5f394 00000148 00000000
[   16.245581] ffc0: bee5f380 00000014 bee5f380 00000122 fffffd6e 00004300 00004800 00004400
[   16.254104] ffe0: bee5f378 bee5f36c 000307ec b6f39044 40000010 00000006 ed36fa40 00000000
[   16.262642] [<c048b9cc>] (cpsw_tx_interrupt) from [<c009928c>] (handle_irq_event_percpu+0x64/0x204)
[   16.272076] [<c009928c>] (handle_irq_event_percpu) from [<c009946c>] (handle_irq_event+0x40/0x64)
[   16.281330] [<c009946c>] (handle_irq_event) from [<c009c370>] (handle_fasteoi_irq+0xcc/0x1a8)
[   16.290220] [<c009c370>] (handle_fasteoi_irq) from [<c0098b3c>] (generic_handle_irq+0x20/0x30)
[   16.299197] [<c0098b3c>] (generic_handle_irq) from [<c0098c50>] (__handle_domain_irq+0x64/0xdc)
[   16.308273] [<c0098c50>] (__handle_domain_irq) from [<c00094c4>] (gic_handle_irq+0x20/0x60)
[   16.316987] [<c00094c4>] (gic_handle_irq) from [<c05ef964>] (__irq_svc+0x44/0x5c)
[   16.324779] Exception stack(0xed3ffcb0 to 0xed3ffcf8)
[   16.330044] fca0:                                     00000001 ed2a33d8 00000000 ed2a2e00
[   16.338567] fcc0: 60000013 ee536bf8 60000013 ee51b800 ee7e9880 ee67e268 ee7e9880 ee534800
[   16.347090] fce0: c0ad0768 ed3ffcf8 c008e910 c05ef4e8 60000013 ffffffff
[   16.353987] [<c05ef964>] (__irq_svc) from [<c05ef4e8>] (_raw_spin_unlock_irqrestore+0x34/0x44)
[   16.362973] [<c05ef4e8>] (_raw_spin_unlock_irqrestore) from [<c0487a04>] (cpdma_check_free_tx_desc+0x60/0x6c)
[   16.373311] [<c0487a04>] (cpdma_check_free_tx_desc) from [<c048c990>] (cpsw_ndo_start_xmit+0xb4/0x1ac)
[   16.383017] [<c048c990>] (cpsw_ndo_start_xmit) from [<c05000e8>] (dev_hard_start_xmit+0x2a4/0x4c0)
[   16.392364] [<c05000e8>] (dev_hard_start_xmit) from [<c051eedc>] (sch_direct_xmit+0xf4/0x210)
[   16.401246] [<c051eedc>] (sch_direct_xmit) from [<c05006fc>] (__dev_queue_xmit+0x2ac/0x7bc)
[   16.409960] [<c05006fc>] (__dev_queue_xmit) from [<c05a9054>] (packet_sendmsg+0xc68/0xeb4)
[   16.418585] [<c05a9054>] (packet_sendmsg) from [<c04e2b64>] (sock_sendmsg+0x14/0x24)
[   16.426663] [<c04e2b64>] (sock_sendmsg) from [<c04e3b00>] (SyS_sendto+0xb4/0xe0)
[   16.434377] [<c04e3b00>] (SyS_sendto) from [<c000f5e0>] (ret_fast_syscall+0x0/0x54)
[   16.442360] Code: e5943118 e593303c e3530000 0a000002 (e5930720)
[   16.448716] ---[ end trace a68159f094d85ba6 ]---
[   16.453526] Kernel panic - not syncing: Fatal exception in interrupt
[   16.460149] ---[ end Kernel panic - not syncing: Fatal exception in interrupt
Signed-off-by: NMugunthan V N <mugunthanvnm@ti.com>
Cc: <stable@vger.kernel.org> # v3.8+
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This howto made sense in the 1990s when users had to manually configure
ISA cards with jumpers or vendor utilities, but with the implementation
of PCI it became increasingly less and less relevant, to the point where
it has been well over a decade since I last updated it.  And there is
no value in anyone else taking over updating it either.

However the references to it continue to spread as boiler plate text
from one Kconfig file into the next.  We are not doing end users any
favours by pointing them at this old document, so lets kill it with
fire, once and for all, to hopefully stop any further spread.

No code is changed in this commit, just Kconfig help text.
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The function, cpsw_intr_disable, already calls cpdma_ctlr_int_ctrl.  There
is no need to disable the dma interrupts twice.  This patch removes the
extra calls.
Signed-off-by: NRichard Cochran <richardcochran@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The function, cpsw_intr_enable, already calls cpdma_ctlr_int_ctrl.  There
is no need to enable the dma interrupts twice.  This patch removes the
extra call.
Signed-off-by: NRichard Cochran <richardcochran@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The funtions, cpsw_ale_flush and cpsw_ale_set_ageout, have never been used
since they were first introduced.  This patch removes the dead code.
Signed-off-by: NRichard Cochran <richardcochran@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>