lwn.git/drivers/net/vmxnet3/vmxnet3_drv.c, branch docs-6.1

vmxnet3: do not reschedule napi for rx processing

2022-07-29T11:11:23+00:00

Commit '2c5a5748105a ("vmxnet3: add support for out of order rx completion")' added support for out of order rx completion. Within that patch, an enhancement was done to reschedule napi for processing rx completions. However, it can lead to missing an interrupt. So, this patch reverts that part of the code. Fixes: 2c5a5748105a ("vmxnet3: add support for out of order rx completion") Signed-off-by: Ronak Doshi Acked-by: Guolin Yang Signed-off-by: David S. Miller

vmxnet3: Record queue number to incoming packets

2022-07-19T03:38:53+00:00

Make generic XDP processing attribute packets to their actual queues instead of queue #0. This improves AF_XDP performance considerably since softirq threads no longer fight over single AF_XDP socket spinlock. Signed-off-by: Andrey Turkin Link: https://lore.kernel.org/r/20220717022050.822766-2-andrey.turkin@gmail.com Signed-off-by: Jakub Kicinski

vmxnet3: disable overlay offloads if UPT device does not support

2022-06-20T08:12:46+00:00

'Commit 6f91f4ba046e ("vmxnet3: add support for capability registers")' added support for capability registers. These registers are used to advertize capabilities of the device. The patch updated the dev_caps to disable outer checksum offload if PTCR register does not support it. However, it missed to update other overlay offloads. This patch fixes this issue. Fixes: 6f91f4ba046e ("vmxnet3: add support for capability registers") Signed-off-by: Ronak Doshi Signed-off-by: David S. Miller

vmxnet3: update to version 7

2022-06-09T10:42:01+00:00

With all vmxnet3 version 7 changes incorporated in the vmxnet3 driver, the driver can configure emulation to run at vmxnet3 version 7, provided the emulation advertises support for version 7. Signed-off-by: Ronak Doshi Acked-by: Guolin Yang Signed-off-by: Paolo Abeni

vmxnet3: use ext1 field to indicate encapsulated packet

2022-06-09T10:42:01+00:00

Till vmxnet3 version 6, om field of transmit descriptor was used to indicate encapsulated offload packet and msscof was used to indirectly indicate TSO/CSO. From version 7 and later, ext1 field will be used to indicate whether packet is encapsulated or not and om fields will continue to indicate if the packet is TSO or CSO. Signed-off-by: Ronak Doshi Acked-by: Guolin Yang Signed-off-by: Paolo Abeni

vmxnet3: limit number of TXDs used for TSO packet

2022-06-09T10:42:01+00:00

Currently, vmxnet3 does not have a limit on number of descriptors used for a TSO packet. However, with UPT, for hardware performance reasons, this patch limits the number of transmit descriptors to 24 for a TSO packet. Signed-off-by: Ronak Doshi Acked-by: Guolin Yang Signed-off-by: Paolo Abeni

vmxnet3: add command to set ring buffer sizes

2022-06-09T10:42:01+00:00

This patch adds a new command to set ring buffer sizes. This is required to pass the buffer size information to passthrough devices. For performance reasons, with version7 and later, ring1 will contain only mtu size buffers (bound to 3K). Packets > 3K will use both ring1 and ring2. Also, ring sizes are round down to power of 2 and ring2 default size is increased to 512. Signed-off-by: Ronak Doshi Acked-by: Guolin Yang Signed-off-by: Paolo Abeni

vmxnet3: add support for out of order rx completion

2022-06-09T10:42:01+00:00

Currently, vmxnet3 processes rx completions in-order i.e. no out of order completion descriptor is expected. With UPT, if hardware supports LRO, then hardware can report out of order rx completions. This patch enhances vmxnet3 to add this support. This supports gets effective only when the corresponding feature bit is set. Also, minor enhancements are done for performance. Signed-off-by: Ronak Doshi Acked-by: Guolin Yang Signed-off-by: Paolo Abeni

vmxnet3: add support for large passthrough BAR register

2022-06-09T10:42:00+00:00

For vmxnet3 to work in UPT mode, the BAR sizes have been increased. The PT page has been extended to 2 pages and also includes OOB pages as a part of PT BAR. This patch enhances vmxnet3 to use appropriate BAR offsets based on the capability registered. To use new offsets, VMXNET3_CAP_LARGE_BAR needs to be set by the device. If it is not set then the device will use legacy PT page layout. Signed-off-by: Ronak Doshi Acked-by: Guolin Yang Signed-off-by: Paolo Abeni

vmxnet3: add support for capability registers

2022-06-09T10:42:00+00:00

This patch enhances vmxnet3 to suuport capability registers which allows it to enable features selectively. The DCR register tracks the capabilities vmxnet3 device supports. The PTCR register states the capabilities that the passthrough device supports. With the help of these registers, vmxnet3 can enable only those features which the passthrough device supoprts. This allows smooth trasition to Uniform-Passthrough (UPT) mode if the virtual nic requests it. If PTCR register returns nothing or error it means UPT is not being requested and vnic will continue in emulation mode. Signed-off-by: Ronak Doshi Acked-by: Guolin Yang Signed-off-by: Paolo Abeni