* handle new SAE (WPA3 authentication) status codes in the correct way
* fix a while that should be an if instead, avoiding infinite loops
* handle beacon filtering changing better
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Merge tag 'mac80211-next-for-davem-2020-08-03' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next
Johannes Berg says:
====================
A few more changes, notably:
* handle new SAE (WPA3 authentication) status codes in the correct way
* fix a while that should be an if instead, avoiding infinite loops
* handle beacon filtering changing better
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
With the latest net-next tree, if test suspend/resume after enabling
WOL, we get error as below:
[ 487.086365] dpm_run_callback(): mdio_bus_suspend+0x0/0x30 returns -16
[ 487.086375] PM: Device stmmac-0:00 failed to suspend: error -16
-16 means -EBUSY, this is because I didn't enable wakeup of the correct
device when implementing phy based WOL feature. To be honest, I caught
the issue when implementing phy based WOL and then fix it locally, but
forgot to amend the phy based wol patch. Today, I found the issue by
testing net-next tree.
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Refactor the function seg6_lwt_headroom out of the seg6_iptunnel.h uapi
header, because it is only used in seg6_iptunnel.c. Moreover, it is only
used in the kernel code, as indicated by the "#ifdef __KERNEL__".
Suggested-by: David Miller <davem@davemloft.net>
Signed-off-by: Ioana-Ruxandra Stăncioi <stancioi@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
For retransmitted packets, TCP needs to resort to using TCP timestamps
for computing RTT samples. In the common case where the data and ACK
fall in the same 1-millisecond interval, TCP senders with millisecond-
granularity TCP timestamps compute a ca_rtt_us of 0. This ca_rtt_us
of 0 propagates to rs->rtt_us.
This value of 0 can cause performance problems for congestion control
modules. For example, in BBR, the zero min_rtt sample can bring the
min_rtt and BDP estimate down to 0, reduce snd_cwnd and result in a
low throughput. It would be hard to mitigate this with filtering in
the congestion control module, because the proper floor to apply would
depend on the method of RTT sampling (using timestamp options or
internally-saved transmission timestamps).
This fix applies a floor of 1 for the RTT sample delta from TCP
timestamps, so that seq_rtt_us, ca_rtt_us, and rs->rtt_us will be at
least 1 * (USEC_PER_SEC / TCP_TS_HZ).
Note that the receiver RTT computation in tcp_rcv_rtt_measure() and
min_rtt computation in tcp_update_rtt_min() both already apply a floor
of 1 timestamp tick, so this commit makes the code more consistent in
avoiding this edge case of a value of 0.
Signed-off-by: Jianfeng Wang <jfwang@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Kevin Yang <yyd@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Using is_broadcast_ether_addr() instead of directly use
memcmp() to determine if the ethernet address is broadcast
address.
spatch with a semantic match is used to found this problem.
(http://coccinelle.lip6.fr/)
Signed-off-by: Huang Guobin <huangguobin4@huawei.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Florinel Iordache says:
====================
DPAA FMan driver fixes
Here are several fixes for the DPAA FMan driver.
v2 changes:
* corrected patch 4 by removing the line added by mistake
* used longer fixes tags with the first 12 characters of the SHA-1 ID
v3 changes:
* remove the empty line inserted after fixes tag
====================
Acked-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Fix memory allocation for ethernet address hash table.
The code was wrongly allocating an array for eth hash table which
is incorrect because this is the main structure for eth hash table
(struct eth_hash_t) that contains inside a number of elements.
Fixes: 57ba4c9b56 ("fsl/fman: Add FMan MAC support")
Signed-off-by: Florinel Iordache <florinel.iordache@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add a safe check to avoid dereferencing null pointer
Fixes: 57ba4c9b56 ("fsl/fman: Add FMan MAC support")
Signed-off-by: Florinel Iordache <florinel.iordache@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The parameter 'priority' is incorrectly forced to zero which ultimately
induces logically dead code in the subsequent lines.
Fixes: 57ba4c9b56 ("fsl/fman: Add FMan MAC support")
Signed-off-by: Florinel Iordache <florinel.iordache@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Check before using returned value to avoid dereferencing null pointer.
Fixes: 18a6c85fcc ("fsl/fman: Add FMan Port Support")
Signed-off-by: Florinel Iordache <florinel.iordache@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Potentially overflowing expression (ts_freq << 16 and intgr << 16)
declared as type u32 (32-bit unsigned) is evaluated using 32-bit
arithmetic and then used in a context that expects an expression of
type u64 (64-bit unsigned) which ultimately is used as 16-bit
unsigned by typecasting to u16. Fixed by using an unsigned 32-bit
integer since the value is truncated anyway in the end.
Fixes: 414fd46e77 ("fsl/fman: Add FMan support")
Signed-off-by: Florinel Iordache <florinel.iordache@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Pablo Neira Ayuso says:
====================
Netfilter updates for net-next
1) UAF in chain binding support from previous batch, from Dan Carpenter.
2) Queue up delayed work to expire connections with no destination,
from Andrew Sy Kim.
3) Use fallthrough pseudo-keyword, from Gustavo A. R. Silva.
4) Replace HTTP links with HTTPS, from Alexander A. Klimov.
5) Remove superfluous null header checks in ip6tables, from
Gaurav Singh.
6) Add extended netlink error reporting for expression.
7) Report EEXIST on overlapping chain, set elements and flowtable
devices.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Avoid a memset after a call to 'dma_alloc_coherent()'.
This is useless since
commit 518a2f1925 ("dma-mapping: zero memory returned from dma_alloc_*")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Update the size used in 'dma_free_coherent()' in order to match the one
used in the corresponding 'dma_alloc_coherent()', in
'spider_net_init_chain()'.
Fixes: d4ed8f8d1f ("Spidernet DMA coalescing")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Update the size used in 'dma_free_coherent()' in order to match the one
used in the corresponding 'dma_alloc_coherent()'.
Fixes: 369a782af0 ("net: sgi: ioc3-eth: ensure tx ring is 16k aligned.")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
On an error exit path, a negative error code should be returned
instead of a positive return value.
Fixes: 0c45d7fe12 ("liquidio: fix use of pf in pass-through mode in a virtual machine")
Cc: Rick Farrington <ricardo.farrington@cavium.com>
Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
In the case of invalid rule, a positive value EINVAL is returned here.
I think this is a typo error. It is necessary to return an error value.
Cc: Po Liu <Po.Liu@nxp.com>
Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
In function hw_atl_a0_hw_multicast_list_set(), when an invalid
request is encountered, a negative error code should be returned.
Fixes: bab6de8fd1 ("net: ethernet: aquantia: Atlantic A0 and B0 specific functions")
Cc: David VomLehn <vomlehn@texas.net>
Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
In queue_skb(), skb->data is mapped to streaming DMA on line 850:
dma_map_single(..., skb->data, ...);
Then skb->data is accessed on lines 862 and 863:
tbd->word_4 = (skb->data[0] << 24) | (skb->data[1] << 16) |
(skb->data[2] << 8) | (skb->data[3] << 0);
and on lines 893 and 894:
tbd->word_4 = (skb->data[0] << 24) | (skb->data[1] << 16) |
(skb->data[2] << 8) | (skb->data[3] << 0);
These accesses may cause data inconsistency between CPU cache and
hardware.
To fix this problem, the calculation result of skb->data is stored in a
local variable before DMA mapping, and then the driver accesses this
local variable instead of skb->data.
Signed-off-by: Jia-Ju Bai <baijiaju@tsinghua.edu.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
In do_tx(), skb->data is mapped to streaming DMA on line 1111:
paddr = dma_map_single(...,skb->data,DMA_TO_DEVICE);
Then skb->data is accessed on line 1153:
(skb->data[3] & 0xf)
This access may cause data inconsistency between CPU cache and hardware.
To fix this problem, skb->data[3] is assigned to a local variable before
DMA mapping, and then the driver accesses this local variable instead of
skb->data[3].
Signed-off-by: Jia-Ju Bai <baijiaju@tsinghua.edu.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
PHYLIB is not selected by the mvusb driver but it uses mdio devres
helpers. Explicitly select MDIO_DEVRES in this driver's Kconfig entry.
Reported-by: kernel test robot <lkp@intel.com>
Fixes: 1814cff267 ("net: phy: add a Kconfig option for mdio_devres")
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add a missing return statement to atalk_proc_init so it doesn't return
-ENOMEM when successful. This allows the appletalk module to load
properly.
Fixes: e2bcd8b0ce ("appletalk: use remove_proc_subtree to simplify procfs code")
Link: https://www.downtowndougbrown.com/2020/08/hacking-up-a-fix-for-the-broken-appletalk-kernel-module-in-linux-5-1-and-newer/
Reported-by: Christopher KOBAYASHI <chris@disavowed.jp>
Reported-by: Doug Brown <doug@downtowndougbrown.com>
Signed-off-by: Vincent Duvert <vincent.ldev@duvert.net>
[lukas: add missing tags]
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: stable@vger.kernel.org # v5.1+
Cc: Yue Haibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This adds full 802.1q VLAN support to the qca8k, allowing the use of
vlan_filtering and more complicated bridging setups than allowed by
basic port VLAN support.
Tested with a number of untagged ports with separate VLANs and then a
trunk port with all the VLANs tagged on it.
v3:
- Pull QCA8K_PORT_VID_DEF changes into separate cleanup patch
- Reverse Christmas tree notation for variable definitions
- Use untagged instead of tagged for consistency
v2:
- Return sensible errnos on failure rather than -1 (rmk)
- Style cleanups based on Florian's feedback
- Silently allow VLAN 0 as device correctly treats this as no tag
Signed-off-by: Jonathan McDowell <noodles@earth.li>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Rather than using a magic value of 1 when configuring the port VIDs add
a QCA8K_PORT_VID_DEF define and use that instead. Also fix up the
bitmask in the process; the top 4 bits are reserved so this wasn't a
problem, but only masking 12 bits is the correct approach.
Signed-off-by: Jonathan McDowell <noodles@earth.li>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Tony Nguyen says:
====================
100GbE Intel Wired LAN Driver Updates 2020-08-01
This series contains updates to the ice driver only.
Wei Yongjun marks power management functions with __maybe_unused.
Nick disables VLAN pruning in promiscuous mode and renames grst_delay to
grst_timeout.
Kiran modifies the check for linearization and corrects the vsi_id mask
value.
Vignesh replaces the use of flow profile locks to RSS profile locks for RSS
rule removal. Destroys flow profile lock on clearing XLT table and
clears extraction sequence entries.
Jesse adds some statistics and removes an unreported one.
Brett allows for 2 queue configuration for VFs.
Surabhi adds a check for failed allocation of an extraction sequence
table.
Tony updates the PTYPE lookup table and makes other trivial fixes.
Victor extends profile ID locks to be held until all references are
completed.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
When we don't care about vlan depth, we could pass NULL instead of the
address of a unused local variable to skb_network_protocol() as a param.
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
In fact, skb_pagelen() - skb_headlen() is equal to __skb_pagelen(), use it
directly to avoid unnecessary skb_headlen() call.
Also fix the CHECK note of checkpatch.pl:
Comparison to NULL could be written "!__pskb_pull_tail"
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Use eth_zero_addr() to clear mac address instead of memset().
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Use eth_zero_addr() to clear mac address instead of memset().
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
commit c8729cac2a ("cxgb4: add ethtool n-tuple filter insertion")
has removed checking control key for determining IP address types
for TC-FLOWER rules, which causes all the rules being inserted to
hardware to become IPv6 rule type always. So, add back the check
to select the correct IP address type to extract and hence fix the
correct rule type being inserted to hardware.
Also, ethtool_rx_flow_key doesn't have any control key and instead
directly sets the IPv4/IPv6 address keys. So, explicitly set the
IP address type for ethtool n-tuple filters to reuse the same code.
Fixes: c8729cac2a ("cxgb4: add ethtool n-tuple filter insertion")
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The flag indicating the selftest to run is a bitmask. So, fix the
check. Also, the selftests will fail if adapter initialization has
not been completed yet. So, add appropriate check and bail sooner.
Fixes: 7235ffae3d ("cxgb4: add loopback ethtool self-test")
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Shannon Nelson says:
====================
ionic txrx updates
These are a few patches to do some cleanup in the packet
handling and give us more flexibility in tuning performance
by allowing us to put Tx handling on separate interrupts
when it makes sense for particular traffic loads.
v3: simplified queue count change logging, removed unnecessary
check for no count change
v2: dropped the original patch 2 for ringsize change
changed the separated tx/rx interrupts to use ethtool -L
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Add the capability to split the Tx queues onto their own
interrupts with their own napi contexts. This gives the
opportunity for more direct control of Tx interrupt
handling, such as CPU affinity and interrupt coalescing,
useful for some traffic loads.
v2: use ethtool -L, not a vendor specific priv-flag
v3: simplify logging, drop unnecessary "no-change" tests
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
We give the tx clean path its own budget and service routine in
order to give a little more leeway to be more aggressive, and
in preparation for coming changes. We've found this gives us
a little better performance in some packet processing scenarios
without hurting other scenarios.
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
We really don't need to hit the Rx queue doorbell so many times,
we can wait to the end and cause a little less thrash.
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
The GRE tunnel can be used to transport traffic that does not rely on a
Internet checksum (e.g. SCTP). The issue can be triggered creating a GRE
or GRETAP tunnel and transmitting SCTP traffic ontop of it where CRC
offload has been disabled. In order to fix the issue we need to
recompute the GRE csum in gre_gso_segment() not relying on the inner
checksum.
The issue is still present when we have the CRC offload enabled.
In this case we need to disable the CRC offload if we require GRE
checksum since otherwise skb_checksum() will report a wrong value.
Fixes: 90017accff ("sctp: Add GSO support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
We need to clear all of the bridge private skb variables as they can be
stale due to the packet being recirculated through the stack and then
transmitted through the bridge device. Similar memset is already done on
bridge's input. We've seen cases where proxyarp_replied was 1 on routed
multicast packets transmitted through the bridge to ports with neigh
suppress which were getting dropped. Same thing can in theory happen with
the port isolation bit as well.
Fixes: 821f1b21ca ("bridge: add new BR_NEIGH_SUPPRESS port flag to suppress arp and nd flood")
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
"how" was used as a boolean. Change the type to bool, and improve
variable name
Signed-off-by: Florent Fourcot <florent.fourcot@wifirst.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Second parameter of addrconf_ifdown "how" is used as a boolean
internally. It does not make sense to call it with something different
of 0 or 1.
This value is set to 2 in all git history.
Signed-off-by: Florent Fourcot <florent.fourcot@wifirst.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Eelco Chaudron says:
====================
net: openvswitch: masks cache enhancements
This patchset adds two enhancements to the Open vSwitch masks cache.
Changes in v4 [patch 2/2 only]:
- Remove null check before calling free_percpu()
- Make ovs_dp_change() return appropriate error codes
Changes in v3 [patch 2/2 only]:
- Use is_power_of_2() function
- Use array_size() function
- Fix remaining sparse errors
Changes in v2 [patch 2/2 only]:
- Fix sparse warnings
- Fix netlink policy items reported by Florian Westphal
====================
Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch makes the masks cache size configurable, or with
a size of 0, disable it.
Reviewed-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Add a counter that counts the number of masks cache hits, and
export it through the megaflow netlink statistics.
Reviewed-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Release skb memory in mvpp2_rx() if mvpp2_rx_refill routine fails
Fixes: b501585467 ("net: mvpp2: fix refilling BM pools in RX path")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Acked-by: Matteo Croce <mcroce@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
info cannot be NULL here since its being accessed earlier
in the function: nlmsg_parse(info->nlhdr...). Remove this
redundant NULL check.
Signed-off-by: Gaurav Singh <gaurav1086@gmail.com>
Reviewed-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
ovs_ct_put_key() is potentially copying uninitialized kernel stack memory
into socket buffers, since the compiler may leave a 3-byte hole at the end
of `struct ovs_key_ct_tuple_ipv4` and `struct ovs_key_ct_tuple_ipv6`. Fix
it by initializing `orig` with memset().
Fixes: 9dd7f8907c ("openvswitch: Add original direction conntrack tuple to sw_flow_key.")
Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
When openvswitch conntrack offload with act_ct action. Fragment packets
defrag in the ingress tc act_ct action and miss the next chain. Then the
packet pass to the openvswitch datapath without the mru. The over
mtu packet will be dropped in output action in openvswitch for over mtu.
"kernel: net2: dropped over-mtu packet: 1528 > 1500"
This patch add mru in the tc_skb_ext for adefrag and miss next chain
situation. And also add mru in the qdisc_skb_cb. The act_ct set the mru
to the qdisc_skb_cb when the packet defrag. And When the chain miss,
The mru is set to tc_skb_ext which can be got by ovs datapath.
Fixes: b57dc7c13e ("net/sched: Introduce action ct")
Signed-off-by: wenxu <wenxu@ucloud.cn>
Reviewed-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Bruno Thomsen says:
====================
Improve MDIO Ethernet PHY reset
This patch series is a result of trying to upstream a new device
tree for a TQMa7D based board[1][2]. Initial this DTS used some
deprecated PHY reset properties on the FEC device; NXP Ethernet
MAC also known as Freescale Fast Ethernet Controller.
When switching from FEC properties[3]:
"phy-reset-gpios"
"phy-reset-duration"
"phy-reset-post-delay"
To MDIO PHY properties[4]:
"reset-gpios"
"reset-assert-us"
"reset-deassert-us"
The result was that no Ethernet PHY device was detected on boot.
This issue could be worked around by disabling PHY type ID auto-
detection by using "ethernet-phy-id0022.1560" as compatible
string and not "ethernet-phy-ieee802.3-c22".
Upstreaming a DTS with this workaround was not accepted, so I
digged into the MDIO reset flow and found that it had a few
missing parts compared to the deprecated FEC reset function.
After some more testing and logic analyzer traces it was
revealed that the failed PHY communication was due to missing
initial device reset.
I was suggested[5] in a earlier mail thread to use MDIO bus
reset as that was performed before auto-detection, but current
device tree binding was limited to reset assert in usec.
Microchip/Micrel Ethernet PHYs recommended reset circuit[8],
figure 7-12, is a little "slow" after reset deassert as that
is left to a RC circuit with a tau of ~100ms; using a 10k PU
resistor together with a 10uF decoupling capacitor. The diode
in serie of the reset signal converts the GPIO push-pull output
into a open-drain output. So a post reset delay in the range
of 500-1000ms is needed, depending on component tolerances
and general hardware design margins.
In the first version of this patch series[6] I reused the
"reset-delay-us" property for reset deassert in usec as that
would cause 50/50% duty-cycle, but that would always apply.
The solution in this patch series is to add a new MDIO bus
property, so post reset delay is optional and configured
separately.
MDIO bus properties[7]:
"reset-delay-us"
"reset-post-delay-us" (new)
I have not marked this with "Fixes:" as no single commit is the
cause and historically this code has only supported MDIO devices
that need reset after auto-detection. The patch series also uses
a new flexible sleep helper function that was introduced in
5.8-rc1, so the driver uses the optimal sleep function depending
on value loaded from device tree.
Future work in this area could add new properties on the MDIO
device, so reset points are configurable, e.g. no reset,
before/after auto-detection or both.
[1] https://lore.kernel.org/linux-devicetree/20200629114927.17379-2-bruno.thomsen@gmail.com/
[2] https://lore.kernel.org/linux-devicetree/20200716172611.5349-2-bruno.thomsen@gmail.com/
[3] https://elixir.bootlin.com/linux/v5.7.8/source/Documentation/devicetree/bindings/net/fsl-fec.txt#L44
[4] https://elixir.bootlin.com/linux/v5.8-rc4/source/Documentation/devicetree/bindings/net/mdio.yaml#L78
[5] https://lore.kernel.org/netdev/CAOMZO5DtYDomD8FDCZDwYCSr2AwNT81Ay4==aDxXyBxtyvPiJA@mail.gmail.com/
[6] https://lore.kernel.org/netdev/20200728090203.17313-1-bruno.thomsen@gmail.com/
[7] https://elixir.bootlin.com/linux/v5.8-rc4/source/Documentation/devicetree/bindings/net/mdio.yaml#L36
[8] http://ww1.microchip.com/downloads/en/DeviceDoc/00002202C.pdf
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
MDIO device reset assert and deassert length was created by
usleep_range() but that does not ensure optimal handling of
all the different values from device tree properties.
By switching to the new flexible sleeping helper function,
fsleep(), the correct delay function is called depending on
delay length, e.g. udelay(), usleep_range() or msleep().
Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Load new "reset-post-delay-us" value from MDIO properties,
and if configured to a greater then zero delay do a
flexible sleeping delay after MDIO bus reset deassert.
This allows devices to exit reset state before start
bus communication.
Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
MDIO bus reset pulse width is created by using udelay()
and that function might not be optimal depending on
device tree value. By switching to the new fsleep() helper
the correct delay function is called depending on
delay length, e.g. udelay(), usleep_range() or msleep().
Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
