mirror of https://gitee.com/openkylin/linux.git
vmxnet3: introduce generalized command interface to configure the device
Shared memory is used to exchange information between the vmxnet3 driver and the emulation. In order to request emulation to perform a task, the driver first populates specific fields in this shared memory and then issues corresponding command by writing to the command register(CMD). The layout of the shared memory was defined by vmxnet3 version 1 and cannot be extended for every new command without breaking backward compatibility. To address this problem, in vmxnet3 version 3, the emulation repurposed a reserved field in the shared memory to represent command information instead. For new commands, the driver first populates the command information field in the shared memory and then issues the command. The emulation interprets the data written to the command information depending on the type of the command. This patch exposes this capability to the driver. Signed-off-by: Guolin Yang <gyang@vmware.com> Signed-off-by: Shrikrishna Khare <skhare@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -79,6 +79,7 @@ enum {
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VMXNET3_CMD_RESERVED1,
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VMXNET3_CMD_LOAD_PLUGIN,
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VMXNET3_CMD_RESERVED2,
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VMXNET3_CMD_RESERVED3,
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VMXNET3_CMD_FIRST_GET = 0xF00D0000,
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VMXNET3_CMD_GET_QUEUE_STATUS = VMXNET3_CMD_FIRST_GET,
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@ -612,6 +613,18 @@ struct Vmxnet3_RxQueueDesc {
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u8 __pad[88]; /* 128 aligned */
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};
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struct Vmxnet3_SetPolling {
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u8 enablePolling;
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};
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/* If the command data <= 16 bytes, use the shared memory directly.
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* otherwise, use variable length configuration descriptor.
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*/
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union Vmxnet3_CmdInfo {
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struct Vmxnet3_VariableLenConfDesc varConf;
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struct Vmxnet3_SetPolling setPolling;
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__le64 data[2];
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};
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struct Vmxnet3_DSDevRead {
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/* read-only region for device, read by dev in response to a SET cmd */
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@ -630,7 +643,14 @@ struct Vmxnet3_DriverShared {
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__le32 pad;
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struct Vmxnet3_DSDevRead devRead;
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__le32 ecr;
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__le32 reserved[5];
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__le32 reserved;
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union {
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__le32 reserved1[4];
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union Vmxnet3_CmdInfo cmdInfo; /* only valid in the context of
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* executing the relevant
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* command
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*/
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} cu;
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};
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