P4080 PCIe Adapter SDK User Guide Production Release

Freescale Semiconductor
cmd_fd: FD used to form the response command FD. It returns the modified form of
“cmd_fd” with “type” and “sub_type” fields set accordingly.
struct p4080_fd {
u16 type;
u16 sub_type;
u32 __reserved;
u64 phys_addr_of_buff;
u64 cookie;
struct qm_fd qman_fd;
}
o type – Hardware function type
o sub_type – For denoting sub commands in a Hardware Function
o __reserved – Used for SKB headroom and tail rooms. Also used for marking
command completion status.
o phys_addr_of_buff – Physical address of SKB data
o cookie – Virtual address of the SKB
o qman_fd – Qman File Descriptor.
/**
* API: pkt_drv_confirm_cmd_response : It confirms the completion of the
* command processing in the “__reserved” field of the “struct p4080_fd”
* structure by setting it to “1”. Prior to invoking this API, the caller
* needs to have invoked the pkt_drv_enqueue_cmd_response() API to ensure
* in-order delivery of the command response.
* Though the pkt_drv_enqueue_cmd_response()
* API enqueues the response commands FD into the Rx command ring, it
* doesn’t confirm command completion. This API enables the Host to see the
* command response.
*
* @cmd_fd – Pointer to the FD whose completion status has to be set.
*/
The prototype of this API is as follows.
void pkt_drv_confirm_cmd_response(struct p4080_fd *fd);
DMA
/**
cmd_fd: FD for which the “__reserved” field is set to notify that this response command
can be processed.
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