LRO/RSC in the vSwitch is a feature available in Windows Server 2019
hosts and later. It reduces the per packet processing overhead by
coalescing multiple TCP segments when possible. This patch adds netvsc
driver support for this feature.
Signed-off-by: NHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Florian Fainelli says:

====================
net: dsa: b53: SGMII modes fixes

Here are two additional fixes that are required in order for SGMII to
work correctly. This was discovered with using a copper SFP which would
make us use SGMII mode, we would actually leave the HW configured in its
default mode: Fiber.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

In both 802.3z and SGMII modes we need to configure the MAC accordingly
to flip between Fiber and SGMII modes, and we need to read the MAC
status from the SGMII in-band control word.

Fixes: 0e01491d ("net: dsa: b53: Add SerDes support")
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Maths went wrong, to get 0x20, we need to do 0x1e + (x) * 2, not 0x18,
fix that offset so we access the correct registers. This would make us
not access the correct SerDes Digital control words, status would be
fine and so we would not be correctly flipping between Fiber and SGMII
modes resulting in incorrect status words being pulled into the SerDes
digital status register.

Fixes: 0e01491d ("net: dsa: b53: Add SerDes support")
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

PHYLINK takes care of filing the right information into
state->an_enabled, get rid of the read from the SerDes's BMCR register.

Fixes: 0e01491d ("net: dsa: b53: Add SerDes support")
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Clang warns that the address of a pointer will always evaluated as true
in a boolean context.

net/decnet/dn_dev.c:1366:10: warning: address of array 'dev->name' will
always evaluate to 'true' [-Wpointer-bool-conversion]
                                dev->name ? dev->name : "???",
                                ~~~~~^~~~ ~
1 warning generated.

Link: https://github.com/ClangBuiltLinux/linux/issues/116Signed-off-by: NNathan Chancellor <natechancellor@gmail.com>
Reviewed-by: NStephen Hemminger <stephen@networkplumber.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch adds ipv6 defragmentation tests to ip_defrag selftest,
to complement existing ipv4 tests.
Signed-off-by: NPeter Oskolkov <posk@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Currently, ip[6]frag_high_thresh sysctl values in new namespaces are
hard-limited to those of the root/init ns.

There are at least two use cases when it would be desirable to
set the high_thresh values higher in a child namespace vs the global hard
limit:

- a security/ddos protection policy may lower the thresholds in the
  root/init ns but allow for a special exception in a child namespace
- testing: a test running in a namespace may want to set these
  thresholds higher in its namespace than what is in the root/init ns

The new behavior:

 # ip netns add testns
 # ip netns exec testns bash

 # sysctl -w net.ipv4.ipfrag_high_thresh=9000000
 net.ipv4.ipfrag_high_thresh = 9000000

 # sysctl net.ipv4.ipfrag_high_thresh
 net.ipv4.ipfrag_high_thresh = 9000000

 # sysctl -w net.ipv6.ip6frag_high_thresh=9000000
 net.ipv6.ip6frag_high_thresh = 9000000

 # sysctl net.ipv6.ip6frag_high_thresh
 net.ipv6.ip6frag_high_thresh = 9000000

The old behavior:

 # ip netns add testns
 # ip netns exec testns bash

 # sysctl -w net.ipv4.ipfrag_high_thresh=9000000
 net.ipv4.ipfrag_high_thresh = 9000000

 # sysctl net.ipv4.ipfrag_high_thresh
 net.ipv4.ipfrag_high_thresh = 4194304

 # sysctl -w net.ipv6.ip6frag_high_thresh=9000000
 net.ipv6.ip6frag_high_thresh = 9000000

 # sysctl net.ipv6.ip6frag_high_thresh
 net.ipv6.ip6frag_high_thresh = 4194304
Signed-off-by: NPeter Oskolkov <posk@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This is similar to how ipv4 now behaves:
commit 0ff89efb ("ip: fail fast on IP defrag errors").
Signed-off-by: NPeter Oskolkov <posk@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/fib_frontend.c: In function 'fib_info_nh_uses_dev':
net/ipv4/fib_frontend.c:322:6: error: unused variable 'ret' [-Werror=unused-variable]
cc1: all warnings being treated as errors

Fixes: 78f2756c ("net/ipv4: Move device validation to helper")
Signed-off-by: NEric Dumazet <edumazet@google.com>
Cc: David Ahern <dsahern@gmail.com>
Reviewed-by: NDavid Ahern <dsahern@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Eric Dumazet says:

====================
tcp: switch to Early Departure Time model

In the early days, pacing has been implemented in sch_fq (FQ)
in a generic way :

- SO_MAX_PACING_RATE could be used by any sockets.

- TCP would vary effective pacing rate based on CWND*MSS/SRTT

- FQ would ensure delays between packets based on current
  sk->sk_pacing_rate, but with some quantum based artifacts.
  (inflating RPC tail latencies)

- BBR then tweaked the pacing rate in its various phases
  (PROBE, DRAIN, ...)

This worked reasonably well, but had the side effect that TCP RTT
samples would be inflated by the sojourn time of the packets in FQ.

Also note that when FQ is not used and TCP wants pacing, the
internal pacing fallback has very different behavior, since TCP
emits packets at the time they should be sent (with unreasonable
assumptions about scheduling costs)

Van Jacobson gave a talk at Netdev 0x12 in Montreal, about letting
TCP (or applications for UDP messages) decide of the Earliest
Departure Time, instead of letting packet schedulers derive it
from pacing rate.

https://www.netdevconf.org/0x12/session.html?evolving-from-afap-teaching-nics-about-time
https://www.files.netdevconf.org/d/46def75c2ef345809bbe/files/?p=/Evolving%20from%20AFAP%20%E2%80%93%20Teaching%20NICs%20about%20time.pdf

Recent additions in linux provided SO_TXTIME and a new ETF qdisc
supporting the new skb->tstamp role

This patch series converts TCP and FQ to the same model.

This might in the future allow us to relax tight TSQ limits
(if FQ is present in the output path), and thus lower
number of callbacks to tcp_write_xmit(), thanks to batching.

This will be followed by FQ change allowing SO_TXTIME support
so that QUIC servers can let the pacing being done in FQ (or
offloaded if network device permits)

For example, a TCP flow rated at 24Mbps now shows a more meaningful RTT

Before :

ESTAB  0  211408 10.246.7.151:41558   10.246.7.152:33723
	 cubic wscale:8,8 rto:203 rtt:2.195/0.084 mss:1448 rcvmss:536
  advmss:1448 cwnd:20 ssthresh:20 bytes_acked:36897937
  segs_out:25488 segs_in:12454 data_segs_out:25486
  send 105.5Mbps lastsnd:1 lastrcv:12851 lastack:1
  pacing_rate 24.0Mbps/24.0Mbps delivery_rate 22.9Mbps
  busy:12851ms unacked:4 rcv_space:29200 notsent:205616 minrtt:0.026

After :

ESTAB  0  192584 10.246.7.151:61612   10.246.7.152:34375
	 cubic wscale:8,8 rto:201 rtt:0.165/0.129 mss:1448 rcvmss:536
  advmss:1448 cwnd:20 ssthresh:20 bytes_acked:170755401
  segs_out:117931 segs_in:57651 data_segs_out:117929
  send 1404.1Mbps lastsnd:1 lastrcv:56915 lastack:1
  pacing_rate 24.0Mbps/24.0Mbps delivery_rate 24.2Mbps
  busy:56915ms unacked:4 rcv_space:29200 notsent:186792 minrtt:0.054

A nice side effect of this patch series is a reduction of max/p99
latencies of RPC workloads, since the FQ quantum no longer adds
artifact.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

With the earliest departure time model, we no longer plan
special casing TCP retransmits. We therefore remove dead
code (since most compilers understood skb_is_retransmit()
was false)
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Now TCP keeps track of tcp_wstamp_ns, recording the earliest
departure time of next packet, we can remove duplicate code
from tcp_internal_pacing()

This removes one ktime_get_tai_ns() call, and a divide.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

TCP keeps track of tcp_wstamp_ns by itself, meaning sch_fq
no longer has to do it.

Thanks to this model, TCP can get more accurate RTT samples,
since pacing no longer inflates them.

This has the nice effect of removing some delays caused by FQ
quantum mechanism, causing inflated max/P99 latencies.

Also we might relax TCP Small Queue tight limits in the future,
since this new model allow TCP to build bigger batches, since
sch_fq (or a device with earliest departure time offload) ensure
these packets will be delivered on time.

Note that other protocols are not converted (they will probably
never be) so sch_fq has still support for SO_MAX_PACING_RATE

Tested:

Test showing FQ pacing quantum artifact for low-rate flows,
adding unexpected throttles for RPC flows, inflating max and P99 latencies.

The parameters chosen here are to show what happens typically when
a TCP flow has a reduced pacing rate (this can be caused by a reduced
cwin after few losses, or/and rtt above few ms)

MIBS="MIN_LATENCY,MEAN_LATENCY,MAX_LATENCY,P99_LATENCY,STDDEV_LATENCY"
Before :
$ netperf -H 10.246.7.133 -t TCP_RR -Cc -T6,6 -- -q 2000000 -r 100,100 -o $MIBS
MIGRATED TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.246.7.133 () port 0 AF_INET : first burst 0 : cpu bind
 Minimum Latency Microseconds,Mean Latency Microseconds,Maximum Latency Microseconds,99th Percentile Latency Microseconds,Stddev Latency Microseconds
19,82.78,5279,3825,482.02

After :
$ netperf -H 10.246.7.133 -t TCP_RR -Cc -T6,6 -- -q 2000000 -r 100,100 -o $MIBS
MIGRATED TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.246.7.133 () port 0 AF_INET : first burst 0 : cpu bind
Minimum Latency Microseconds,Mean Latency Microseconds,Maximum Latency Microseconds,99th Percentile Latency Microseconds,Stddev Latency Microseconds
20,49.94,128,63,3.18
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Next patch will use tcp_wstamp_ns to feed internal
TCP pacing timer, so switch to CLOCK_TAI to share same base.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Switch internal TCP skb->skb_mstamp to skb->skb_mstamp_ns,
from usec units to nsec units.

Do not clear skb->tstamp before entering IP stacks in TX,
so that qdisc or devices can implement pacing based on the
earliest departure time instead of socket sk->sk_pacing_rate

Packets are fed with tcp_wstamp_ns, and following patch
will update tcp_wstamp_ns when both TCP and sch_fq switch to
the earliest departure time mechanism.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

TCP will soon provide earliest departure time on TX skbs.
It needs to track this in a new variable.

tcp_mstamp_refresh() needs to update this variable, and
became too big to stay an inline.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

TCP will soon provide per skb->tstamp with earliest departure time,
so that sch_fq does not have to determine departure time by looking
at socket sk_pacing_rate.

We chose in linux-4.19 CLOCK_TAI as the clock base for transports,
qdiscs, and NIC offloads.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

There are few places where TCP reads skb->skb_mstamp expecting
a value in usec unit.

skb->tstamp (aka skb->skb_mstamp) will soon store CLOCK_TAI nsec value.

Add tcp_skb_timestamp_us() to provide proper conversion when needed.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

TCP pacing is either implemented in sch_fq or internally.
We have the goal of being able to offload pacing on the NICS.

TCP will soon provide per skb skb->tstamp as early departure time.

Like ETF in commit 25db26a9 ("net/sched: Introduce the ETF Qdisc")
we chose CLOCK_T as the clock base, so that TCP and pacers can share
a common clock, to get better RTT samples (without pacing artificially
inflating these samples).
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Salil Mehta says:

====================
Bug fixes, snall modifications & cleanup for HNS3 driver

This patch presents some bug fixes, small modifications and cleanups
to the HNS3 VF and PF driver.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch removes hclge_get_port_type which is redundant.
Signed-off-by: NFuyun Liang <liangfuyun1@huawei.com>
Signed-off-by: NPeng Li <lipeng321@huawei.com>
Signed-off-by: NSalil Mehta <salil.mehta@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Our VF has not implemented the ops for get_port_type. So when we executing
ethtool ethx cmd of VF, hns3_get_link_ksettings will return directly. And
we can not query anything.

To support get_link_ksettings for VF, this patch replaces get_port_type
with get_media_type. If the media type is HNAE3_MEDIA_TYPE_NONE,
hns3_get_link_ksettings will return link information of VF.

Fixes: 12f46bc1 ("net: hns3: Refine hns3_get_link_ksettings()")
Signed-off-by: NFuyun Liang <liangfuyun1@huawei.com>
Signed-off-by: NPeng Li <lipeng321@huawei.com>
Signed-off-by: NSalil Mehta <salil.mehta@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch adds the ops of get_media_type support for VF.
Signed-off-by: NFuyun Liang <liangfuyun1@huawei.com>
Signed-off-by: NPeng Li <lipeng321@huawei.com>
Signed-off-by: NSalil Mehta <salil.mehta@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

There are already multiple types packets statistics for error packets,
it's unnecessary to print them, which may affect the rx performance if
print too many.
Signed-off-by: NJian Shen <shenjian15@huawei.com>
Signed-off-by: NPeng Li <lipeng321@huawei.com>
Signed-off-by: NSalil Mehta <salil.mehta@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

For dma_mapping_error is unlikely happened, this patch adds unlikely for
dma_mapping_error check.
Signed-off-by: NJian Shen <shenjian15@huawei.com>
Signed-off-by: NPeng Li <lipeng321@huawei.com>
Signed-off-by: NSalil Mehta <salil.mehta@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

When nic down, it firstly calls netif_tx_stop_all_queues(), then calls
napi_disable(). But napi_disable() will wait current napi_poll finish,
it may call netif_tx_wake_queue(). This patch fixes it by add nic state
checking.

Fixes: 424eb834 ("net: hns3: Unified HNS3 {VF|PF} Ethernet Driver for hip08 SoC")
Signed-off-by: NJian Shen <shenjian15@huawei.com>
Signed-off-by: NPeng Li <lipeng321@huawei.com>
Signed-off-by: NSalil Mehta <salil.mehta@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

There are a few "switch-case" codes missed handle for default case. For
some abnormal case, it should return error code instead of return 0.
Signed-off-by: NJian Shen <shenjian15@huawei.com>
Signed-off-by: NPeng Li <lipeng321@huawei.com>
Signed-off-by: NSalil Mehta <salil.mehta@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The prefix of most functions for vf are hclgevf. This patch renames the
function with inconsistent prefix.
Signed-off-by: NJian Shen <shenjian15@huawei.com>
Signed-off-by: NPeng Li <lipeng321@huawei.com>
Signed-off-by: NSalil Mehta <salil.mehta@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

There are two tqp_num variables "hdev->tqp_num" and "kinfo->tqp_num"
used in VF. "hdev->tqp_num" is the total tqp number allocated to the
VF, and "kinfo->tqp_num" indicates the tqp number being used by the
VF. Usually the two variables are equal. But for the case hdev->tqp_num
larger than rss_size_max, and num_tc is 1, "kinfo->tqp_num" will be
less than "hdev->tqp_num".

In original codes, "hdev->tqp_num" is always used to traverse the
tqp array of kinfo. It may cause null pointer error when "hdev->tqp_num"
is larger than "kinfo->tqp_num"

Fixes: e2cb1dec ("net: hns3: Add HNS3 VF HCL(Hardware Compatibility Layer) Support")
Signed-off-by: NJian Shen <shenjian15@huawei.com>
Signed-off-by: NPeng Li <lipeng321@huawei.com>
Signed-off-by: NSalil Mehta <salil.mehta@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Some prefix of tx/rx statistic names are redundant, this patch modifies
these names.

The new prefix looks like below:
rxq#1_ -> rxq1_
txq#1_ -> txq1_
tx_dropped -> dropped
tx_wake -> wake
tx_busy -> busy
rx_dropped -> dropped
Signed-off-by: NJian Shen <shenjian15@huawei.com>
Signed-off-by: NPeng Li <lipeng321@huawei.com>
Signed-off-by: NSalil Mehta <salil.mehta@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

For desc.data is already point to the address of struct member "data[6]",
it's unnecessary to use '&' to get its address. This patch unifies all
the type convert for dest.data, using "req = (struct name *)dest.data".
Signed-off-by: NJian Shen <shenjian15@huawei.com>
Signed-off-by: NPeng Li <lipeng321@huawei.com>
Signed-off-by: NSalil Mehta <salil.mehta@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

There is a defect in hclge_ets_validate(). If each member of tc_tsa is
not IEEE_8021QAZ_TSA_ETS, the variable total_ets_bw won't be updated.
In this case, the check for value of total_ets_bw will fail. This patch
fixes it by checking total_ets_bw only after it has been updated.

Fixes: cacde272 ("net: hns3: Add hclge_dcb module for the support of DCB feature")
Signed-off-by: NJian Shen <shenjian15@huawei.com>
Signed-off-by: NPeng Li <lipeng321@huawei.com>
Signed-off-by: NSalil Mehta <salil.mehta@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Document RZ/G1N (R8A7744) SoC bindings.
Signed-off-by: NBiju Das <biju.das@bp.renesas.com>
Reviewed-by: NFabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The previous commit to ravb had the side effect of making the PHY
advertise Pause and Asym Pause, which previously did not happen.  By
default, phydev->supported has both forms of pause enabled, but
phydev->advertising does not. The new phy_remove_link_mode() copies
phydev->supported to phydev->advertising after removing the requested
link mode. These Pause configuration bits appears it stops the PHY
from completing Auto-Neg and the link remains down.  Be explicit and
remove the Pause and Asym Pause modes, so restoring the old behavior.

Fixes: 41124fa6 ("net: ethernet: Add helper to remove a supported link mode")
Reported-by: NSimon Horman <horms@verge.net.au>
Signed-off-by: NAndrew Lunn <andrew@lunn.ch>
Reviewed-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Håkon Bugge says:

====================
net: if_arp: use define instead of hard-coded value

Struct arpreq contains the name of the device. All other places in the
kernel, the define IFNAMSIZ is used to designate its size. But in
if_arp.h, a literal constant is used.

As it could be good reasons to use constants instead of the defines in
include files under uapi, it seems to be OK to use the define here,
without opening a can of worms in user-land.

This because if_arp.h includes netdevice.h, which also uses
IFNAMSIZ. For the distros I have checked, this also holds true for the
use-land side.

The series also fixes some incorrect indents.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

uapi/linux/if_arp.h includes linux/netdevice.h, which uses
IFNAMSIZ. Hence, use it instead of hard-coded value.
Signed-off-by: NHåkon Bugge <haakon.bugge@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Fixing incorrect indents and align comments.
Signed-off-by: NHåkon Bugge <haakon.bugge@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

In current implementation, tls records are encrypted & transmitted
serially. Till the time the previously submitted user data is encrypted,
the implementation waits and on finish starts transmitting the record.
This approach of encrypt-one record at a time is inefficient when
asynchronous crypto accelerators are used. For each record, there are
overheads of interrupts, driver softIRQ scheduling etc. Also the crypto
accelerator sits idle most of time while an encrypted record's pages are
handed over to tcp stack for transmission.

This patch enables encryption of multiple records in parallel when an
async capable crypto accelerator is present in system. This is achieved
by allowing the user space application to send more data using sendmsg()
even while previously issued data is being processed by crypto
accelerator. This requires returning the control back to user space
application after submitting encryption request to accelerator. This
also means that zero-copy mode of encryption cannot be used with async
accelerator as we must be done with user space application buffer before
returning from sendmsg().

There can be multiple records in flight to/from the accelerator. Each of
the record is represented by 'struct tls_rec'. This is used to store the
memory pages for the record.

After the records are encrypted, they are added in a linked list called
tx_ready_list which contains encrypted tls records sorted as per tls
sequence number. The records from tx_ready_list are transmitted using a
newly introduced function called tls_tx_records(). The tx_ready_list is
polled for any record ready to be transmitted in sendmsg(), sendpage()
after initiating encryption of new tls records. This achieves parallel
encryption and transmission of records when async accelerator is
present.

There could be situation when crypto accelerator completes encryption
later than polling of tx_ready_list by sendmsg()/sendpage(). Therefore
we need a deferred work context to be able to transmit records from
tx_ready_list. The deferred work context gets scheduled if applications
are not sending much data through the socket. If the applications issue
sendmsg()/sendpage() in quick succession, then the scheduling of
tx_work_handler gets cancelled as the tx_ready_list would be polled from
application's context itself. This saves scheduling overhead of deferred
work.

The patch also brings some side benefit. We are able to get rid of the
concept of CLOSED record. This is because the records once closed are
either encrypted and then placed into tx_ready_list or if encryption
fails, the socket error is set. This simplifies the kernel tls
sendpath. However since tls_device.c is still using macros, accessory
functions for CLOSED records have been retained.
Signed-off-by: NVakul Garg <vakul.garg@nxp.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The method ndo_start_xmit() is defined as returning an 'netdev_tx_t',
which is a typedef for an enum type, so make sure the implementation in
this driver has returns 'netdev_tx_t' value, and change the function
return type to netdev_tx_t.

Found by coccinelle.
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>