linux.git/drivers/net/hyperv/hyperv_net.h, branch v4.15

hv_netvsc: preserve hw_features on mtu/channels/ringparam changes

2017-11-16T01:49:00+00:00

rndis_filter_device_add() is called both from netvsc_probe() when we
initially create the device and from set channels/mtu/ringparam
routines where we basically remove the device and add it back.

hw_features is reset in rndis_filter_device_add() and filled with
host data. However, we lose all additional flags which are set outside
of the driver, e.g. register_netdevice() adds NETIF_F_SOFT_FEATURES and
many others.

Unfortunately, calls to rndis_{query_hwcaps(), _set_offload_params()}
calls cannot be avoided on every RNDIS reset: host expects us to set
required features explicitly. Moreover, in theory hardware capabilities
can change and we need to reflect the change in hw_features.

Reset net->hw_features bits according to host data in
rndis_netdev_set_hwcaps(), clear corresponding feature bits
from net->features in case some features went missing (will never happen
in real life I guess but let's be consistent).

Signed-off-by: Vitaly Kuznetsov 
Reviewed-by: Haiyang Zhang 
Signed-off-by: David S. Miller

hv_netvsc: Rename tx_send_table to tx_table

2017-10-15T01:42:55+00:00

Simplify the variable name: tx_send_table

Signed-off-by: Haiyang Zhang 
Signed-off-by: David S. Miller

hv_netvsc: Rename ind_table to rx_table

2017-10-15T01:42:55+00:00

Rename this variable because it is the Receive indirection
table.

Signed-off-by: Haiyang Zhang 
Signed-off-by: David S. Miller

hv_netvsc: Change the hash level variable to bit flags

2017-10-08T17:11:01+00:00

This simplifies the logic and make it easier to add more
options.

Signed-off-by: Haiyang Zhang 
Signed-off-by: David S. Miller

hv_netvsc: report stop_queue and wake_queue

2017-10-01T03:10:30+00:00

Report the numbers of events for stop_queue and wake_queue in
ethtool stats.

Example:
ethtool -S eth0
NIC statistics:
	...
	stop_queue: 7
	wake_queue: 7
	...

Signed-off-by: Simon Xiao 
Reviewed-by: Haiyang Zhang 
Signed-off-by: David S. Miller

hv_netvsc: fix send buffer failure on MTU change

2017-09-21T22:17:16+00:00

If MTU is changed the host would reject the send buffer change.
This problem is result of recent change to allow changing send
buffer size.

Every time we change the MTU, we store the previous net_device section
count before destroying the buffer, but we don’t store the previous
section size. When we reinitialize the buffer, its size is calculated
by multiplying the previous count and previous size. Since we
continuously increase the MTU, the host returns us a decreasing count
value while the section size is reinitialized to 1728 bytes every
time.

This eventually leads to a condition where the calculated buf_size is
so small that the host rejects it.

Fixes: 8b5327975ae1 ("netvsc: allow controlling send/recv buffer size")
Signed-off-by: Alex Ng 
Signed-off-by: Stephen Hemminger 
Signed-off-by: David S. Miller

hv_netvsc: fix deadlock on hotplug

2017-09-11T21:21:30+00:00

When a virtual device is added dynamically (via host console), then
the vmbus sends an offer message for the primary channel. The processing
of this message for networking causes the network device to then
initialize the sub channels.

The problem is that setting up the sub channels needs to wait until
the subsequent subchannel offers have been processed. These offers
come in on the same ring buffer and work queue as where the primary
offer is being processed; leading to a deadlock.

This did not happen in older kernels, because the sub channel waiting
logic was broken (it wasn't really waiting).

The solution is to do the sub channel setup in its own work queue
context that is scheduled by the primary channel setup; and then
happens later.

Fixes: 732e49850c5e ("netvsc: fix race on sub channel creation")
Reported-by: Dexuan Cui 
Signed-off-by: Stephen Hemminger 
Signed-off-by: David S. Miller

hv_netvsc: Clean up an unused parameter in rndis_filter_set_rss_param()

2017-09-02T03:39:12+00:00

This patch removes the parameter, num_queue in
rndis_filter_set_rss_param(), which is no longer in use.

Signed-off-by: Haiyang Zhang 
Signed-off-by: David S. Miller

hv_netvsc: Add ethtool handler to set and get UDP hash levels

2017-08-22T21:08:12+00:00

The patch add the functions to switch UDP hash level between
L3 and L4 by ethtool command. UDP over IPv4 and v6 can be set
differently. The default hash level is L4. We currently only
allow switching TX hash level from within the guests.

On Azure, fragmented UDP packets have high loss rate with L4
hashing. Using L3 hashing is recommended in this case.

For example, for UDP over IPv4 on eth0:
To include UDP port numbers in hasing:
	ethtool -N eth0 rx-flow-hash udp4 sdfn
To exclude UDP port numbers in hasing:
	ethtool -N eth0 rx-flow-hash udp4 sd
To show UDP hash level:
	ethtool -n eth0 rx-flow-hash udp4

Signed-off-by: Haiyang Zhang 
Signed-off-by: David S. Miller

netvsc: keep track of some non-fatal overload conditions

2017-08-11T21:00:07+00:00

Add ethtool statistics for case where send chimmeny buffer is
exhausted and driver has to fall back to doing scatter/gather
send. Also, add statistic for case where ring buffer is full and
receive completions are delayed.

Signed-off-by: Stephen Hemminger 
Signed-off-by: David S. Miller