kernel/drivers/net/ethernet/sun/sunvnet.h, branch linux-4.3.y

sunvnet: add TSO support

2014-12-09T02:19:04Z

This patch adds TSO support for the sunvnet driver. Signed-off-by: David L Stevens Signed-off-by: David S. Miller

sunvnet: Use one Tx queue per vnet_port

2014-10-30T23:56:23Z

Use multple Tx netdev queues for sunvnet by supporting a one-to-one mapping between vnet_port and Tx queue. Provide a ndo_select_queue indirection (vnet_select_queue()) which selects the queue based on the peer that would be selected in vnet_start_xmit() Signed-off-by: Sowmini Varadhan Signed-off-by: David S. Miller

sunvnet: NAPIfy sunvnet

2014-10-25T20:20:15Z

Move Rx packet procssing to the NAPI poll callback. Disable VIO interrupt and unconditioanlly go into NAPI context from vnet_event. Note that we want to minimize the number of LDC STOP/START messages sent. Specifically, do not send a STOP message if vnet_walk_rx does not read all the available descriptors because of the NAPI budget limitation. Instead, note the end index as part of port state, and resume from this index when the next poll callback is triggered. Signed-off-by: Sowmini Varadhan Acked-by: Raghuram Kothakota Acked-by: Dwight Engen Signed-off-by: David S. Miller

sunvnet: allow admin to set sunvnet MTU

2014-09-30T21:10:39Z

This patch allows an admin to set the MTU on a sunvnet device to arbitrary values between the minimum (68) and maximum (65535) IPv4 packet sizes. Signed-off-by: David L Stevens Signed-off-by: David S. Miller

sunvnet: make transmit path zero-copy in the kernel

2014-09-30T21:10:39Z

This patch removes pre-allocated transmit buffers and instead directly maps pending packets on demand. This saves O(n^2) maximum-sized transmit buffers, for n hosts on a vswitch, as well as a copy to those buffers. Single-stream TCP throughput linux-solaris dropped ~5% for 1500-byte MTU, but linux-linux at 1500-bytes increased ~20%. Signed-off-by: David L Stevens Signed-off-by: David S. Miller

sunvnet: upgrade to VIO protocol version 1.6

2014-09-30T21:10:39Z

This patch upgrades the sunvnet driver to support VIO protocol version 1.6. In particular, it adds per-port MTU negotiation, allowing MTUs other than ETH_FRAMELEN with ports using newer VIO protocol versions. Signed-off-by: David L Stevens Signed-off-by: David S. Miller

sunvnet: Avoid sending superfluous LDC messages.

2014-09-12T22:19:08Z

When sending out a burst of packets across multiple descriptors, it is sufficient to send one LDC "start" trigger for the first descriptor, so do not send an LDC "start" for every pass through vnet_start_xmit. Similarly, it is sufficient to send one "DRING_STOPPED" trigger for the last dring (and if that fails, hold off and send the trigger later). Optimizations to the number of LDC messages helps avoid filling up the LDC channel with superfluous LDC messages that risk triggering flow-control on the channel, and also boosts performance. Signed-off-by: Sowmini Varadhan Acked-by: Raghuram Kothakota Signed-off-by: David S. Miller

sunvnet: Schedule maybe_tx_wakeup() as a tasklet from ldc_rx path

2014-08-14T03:04:46Z

At the tail of vnet_event(), if we hit the maybe_tx_wakeup() condition, we try to take the netif_tx_lock() in the recv-interrupt-context and can deadlock with dev_watchdog(). vnet_event() should schedule maybe_tx_wakeup() as a tasklet to avoid this deadlock Signed-off-by: Sowmini Varadhan Signed-off-by: David S. Miller

cassini/niu/sun*: Move the Sun drivers

2011-08-11T09:33:43Z

Moves the Sun drivers into drivers/net/ethernet/sun/ and make the necessary Kconfig and Makefile changes. Oliver Hartkopp suggested removing the sun* prefix on the driver names. This type of change I will leave up to the driver maintainers. CC: Sam Creasey CC: Adrian Sun CC: Benjamin Herrenscmidt Signed-off-by: Jeff Kirsher