From 474432229f9482f0f4a2732f2e130dc48247f1d7 Mon Sep 17 00:00:00 2001 From: Shrikrishna Khare Date: Thu, 16 Jun 2016 10:51:58 -0700 Subject: [PATCH] vmxnet3: introduce command to register memory region In vmxnet3 version 3, the emulation added support for the vmxnet3 driver to communicate information about the memory regions the driver will use for rx/tx buffers. The driver can also indicate which rx/tx queue the memory region is applicable for. If this information is communicated to the emulation, the emulation will always keep these memory regions mapped, thereby avoiding the mapping/unmapping overhead for every packet. Currently, Linux vmxnet3 driver does not leverage this capability. The feasibility of using this approach for the Linux vmxnet3 driver will be investigated independently and if possible, will be part of a different patch. This patch only exposes the emulation capability to the driver (vmxnet3_defs.h is identical between the driver and the emulation). Signed-off-by: Guolin Yang Signed-off-by: Shrikrishna Khare Signed-off-by: David S. Miller --- drivers/net/vmxnet3/vmxnet3_defs.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/net/vmxnet3/vmxnet3_defs.h b/drivers/net/vmxnet3/vmxnet3_defs.h index 274e145ab72a..c3a31646189f 100644 --- a/drivers/net/vmxnet3/vmxnet3_defs.h +++ b/drivers/net/vmxnet3/vmxnet3_defs.h @@ -81,6 +81,7 @@ enum { VMXNET3_CMD_RESERVED2, VMXNET3_CMD_RESERVED3, VMXNET3_CMD_SET_COALESCE, + VMXNET3_CMD_REGISTER_MEMREGS, VMXNET3_CMD_FIRST_GET = 0xF00D0000, VMXNET3_CMD_GET_QUEUE_STATUS = VMXNET3_CMD_FIRST_GET, @@ -668,6 +669,22 @@ struct Vmxnet3_CoalesceScheme { } coalPara; }; +struct Vmxnet3_MemoryRegion { + __le64 startPA; + __le32 length; + __le16 txQueueBits; + __le16 rxQueueBits; +}; + +#define MAX_MEMORY_REGION_PER_QUEUE 16 +#define MAX_MEMORY_REGION_PER_DEVICE 256 + +struct Vmxnet3_MemRegs { + __le16 numRegs; + __le16 pad[3]; + struct Vmxnet3_MemoryRegion memRegs[1]; +}; + /* If the command data <= 16 bytes, use the shared memory directly. * otherwise, use variable length configuration descriptor. */ -- GitLab