256 lines
9.3 KiB
C
256 lines
9.3 KiB
C
/****************************************************************************
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* Driver for Solarflare Solarstorm network controllers and boards
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* Copyright 2010-2012 Solarflare Communications Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation, incorporated herein by reference.
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*/
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#ifndef _VFDI_H
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#define _VFDI_H
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/**
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* DOC: Virtual Function Driver Interface
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*
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* This file contains software structures used to form a two way
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* communication channel between the VF driver and the PF driver,
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* named Virtual Function Driver Interface (VFDI).
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*
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* For the purposes of VFDI, a page is a memory region with size and
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* alignment of 4K. All addresses are DMA addresses to be used within
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* the domain of the relevant VF.
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*
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* The only hardware-defined channels for a VF driver to communicate
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* with the PF driver are the event mailboxes (%FR_CZ_USR_EV
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* registers). Writing to these registers generates an event with
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* EV_CODE = EV_CODE_USR_EV, USER_QID set to the index of the mailbox
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* and USER_EV_REG_VALUE set to the value written. The PF driver may
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* direct or disable delivery of these events by setting
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* %FR_CZ_USR_EV_CFG.
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*
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* The PF driver can send arbitrary events to arbitrary event queues.
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* However, for consistency, VFDI events from the PF are defined to
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* follow the same form and be sent to the first event queue assigned
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* to the VF while that queue is enabled by the VF driver.
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*
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* The general form of the variable bits of VFDI events is:
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*
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* 0 16 24 31
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* | DATA | TYPE | SEQ |
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*
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* SEQ is a sequence number which should be incremented by 1 (modulo
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* 256) for each event. The sequence numbers used in each direction
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* are independent.
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*
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* The VF submits requests of type &struct vfdi_req by sending the
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* address of the request (ADDR) in a series of 4 events:
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*
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* 0 16 24 31
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* | ADDR[0:15] | VFDI_EV_TYPE_REQ_WORD0 | SEQ |
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* | ADDR[16:31] | VFDI_EV_TYPE_REQ_WORD1 | SEQ+1 |
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* | ADDR[32:47] | VFDI_EV_TYPE_REQ_WORD2 | SEQ+2 |
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* | ADDR[48:63] | VFDI_EV_TYPE_REQ_WORD3 | SEQ+3 |
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*
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* The address must be page-aligned. After receiving such a valid
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* series of events, the PF driver will attempt to read the request
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* and write a response to the same address. In case of an invalid
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* sequence of events or a DMA error, there will be no response.
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*
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* The VF driver may request that the PF driver writes status
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* information into its domain asynchronously. After writing the
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* status, the PF driver will send an event of the form:
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*
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* 0 16 24 31
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* | reserved | VFDI_EV_TYPE_STATUS | SEQ |
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*
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* In case the VF must be reset for any reason, the PF driver will
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* send an event of the form:
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*
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* 0 16 24 31
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* | reserved | VFDI_EV_TYPE_RESET | SEQ |
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*
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* It is then the responsibility of the VF driver to request
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* reinitialisation of its queues.
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*/
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#define VFDI_EV_SEQ_LBN 24
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#define VFDI_EV_SEQ_WIDTH 8
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#define VFDI_EV_TYPE_LBN 16
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#define VFDI_EV_TYPE_WIDTH 8
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#define VFDI_EV_TYPE_REQ_WORD0 0
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#define VFDI_EV_TYPE_REQ_WORD1 1
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#define VFDI_EV_TYPE_REQ_WORD2 2
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#define VFDI_EV_TYPE_REQ_WORD3 3
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#define VFDI_EV_TYPE_STATUS 4
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#define VFDI_EV_TYPE_RESET 5
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#define VFDI_EV_DATA_LBN 0
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#define VFDI_EV_DATA_WIDTH 16
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struct vfdi_endpoint {
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u8 mac_addr[ETH_ALEN];
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__be16 tci;
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};
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/**
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* enum vfdi_op - VFDI operation enumeration
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* @VFDI_OP_RESPONSE: Indicates a response to the request.
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* @VFDI_OP_INIT_EVQ: Initialize SRAM entries and initialize an EVQ.
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* @VFDI_OP_INIT_RXQ: Initialize SRAM entries and initialize an RXQ.
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* @VFDI_OP_INIT_TXQ: Initialize SRAM entries and initialize a TXQ.
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* @VFDI_OP_FINI_ALL_QUEUES: Flush all queues, finalize all queues, then
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* finalize the SRAM entries.
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* @VFDI_OP_INSERT_FILTER: Insert a MAC filter targetting the given RXQ.
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* @VFDI_OP_REMOVE_ALL_FILTERS: Remove all filters.
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* @VFDI_OP_SET_STATUS_PAGE: Set the DMA page(s) used for status updates
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* from PF and write the initial status.
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* @VFDI_OP_CLEAR_STATUS_PAGE: Clear the DMA page(s) used for status
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* updates from PF.
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*/
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enum vfdi_op {
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VFDI_OP_RESPONSE = 0,
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VFDI_OP_INIT_EVQ = 1,
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VFDI_OP_INIT_RXQ = 2,
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VFDI_OP_INIT_TXQ = 3,
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VFDI_OP_FINI_ALL_QUEUES = 4,
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VFDI_OP_INSERT_FILTER = 5,
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VFDI_OP_REMOVE_ALL_FILTERS = 6,
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VFDI_OP_SET_STATUS_PAGE = 7,
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VFDI_OP_CLEAR_STATUS_PAGE = 8,
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VFDI_OP_LIMIT,
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};
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/* Response codes for VFDI operations. Other values may be used in future. */
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#define VFDI_RC_SUCCESS 0
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#define VFDI_RC_ENOMEM (-12)
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#define VFDI_RC_EINVAL (-22)
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#define VFDI_RC_EOPNOTSUPP (-95)
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#define VFDI_RC_ETIMEDOUT (-110)
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/**
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* struct vfdi_req - Request from VF driver to PF driver
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* @op: Operation code or response indicator, taken from &enum vfdi_op.
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* @rc: Response code. Set to 0 on success or a negative error code on failure.
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* @u.init_evq.index: Index of event queue to create.
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* @u.init_evq.buf_count: Number of 4k buffers backing event queue.
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* @u.init_evq.addr: Array of length %u.init_evq.buf_count containing DMA
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* address of each page backing the event queue.
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* @u.init_rxq.index: Index of receive queue to create.
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* @u.init_rxq.buf_count: Number of 4k buffers backing receive queue.
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* @u.init_rxq.evq: Instance of event queue to target receive events at.
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* @u.init_rxq.label: Label used in receive events.
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* @u.init_rxq.flags: Unused.
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* @u.init_rxq.addr: Array of length %u.init_rxq.buf_count containing DMA
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* address of each page backing the receive queue.
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* @u.init_txq.index: Index of transmit queue to create.
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* @u.init_txq.buf_count: Number of 4k buffers backing transmit queue.
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* @u.init_txq.evq: Instance of event queue to target transmit completion
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* events at.
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* @u.init_txq.label: Label used in transmit completion events.
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* @u.init_txq.flags: Checksum offload flags.
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* @u.init_txq.addr: Array of length %u.init_txq.buf_count containing DMA
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* address of each page backing the transmit queue.
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* @u.mac_filter.rxq: Insert MAC filter at VF local address/VLAN targetting
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* all traffic at this receive queue.
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* @u.mac_filter.flags: MAC filter flags.
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* @u.set_status_page.dma_addr: Base address for the &struct vfdi_status.
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* This address must be page-aligned and the PF may write up to a
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* whole page (allowing for extension of the structure).
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* @u.set_status_page.peer_page_count: Number of additional pages the VF
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* has provided into which peer addresses may be DMAd.
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* @u.set_status_page.peer_page_addr: Array of DMA addresses of pages.
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* If the number of peers exceeds 256, then the VF must provide
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* additional pages in this array. The PF will then DMA up to
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* 512 vfdi_endpoint structures into each page. These addresses
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* must be page-aligned.
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*/
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struct vfdi_req {
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u32 op;
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u32 reserved1;
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s32 rc;
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u32 reserved2;
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union {
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struct {
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u32 index;
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u32 buf_count;
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u64 addr[];
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} init_evq;
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struct {
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u32 index;
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u32 buf_count;
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u32 evq;
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u32 label;
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u32 flags;
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#define VFDI_RXQ_FLAG_SCATTER_EN 1
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u32 reserved;
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u64 addr[];
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} init_rxq;
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struct {
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u32 index;
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u32 buf_count;
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u32 evq;
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u32 label;
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u32 flags;
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#define VFDI_TXQ_FLAG_IP_CSUM_DIS 1
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#define VFDI_TXQ_FLAG_TCPUDP_CSUM_DIS 2
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u32 reserved;
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u64 addr[];
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} init_txq;
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struct {
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u32 rxq;
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u32 flags;
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#define VFDI_MAC_FILTER_FLAG_RSS 1
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#define VFDI_MAC_FILTER_FLAG_SCATTER 2
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} mac_filter;
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struct {
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u64 dma_addr;
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u64 peer_page_count;
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u64 peer_page_addr[];
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} set_status_page;
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} u;
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};
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/**
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* struct vfdi_status - Status provided by PF driver to VF driver
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* @generation_start: A generation count DMA'd to VF *before* the
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* rest of the structure.
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* @generation_end: A generation count DMA'd to VF *after* the
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* rest of the structure.
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* @version: Version of this structure; currently set to 1. Later
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* versions must either be layout-compatible or only be sent to VFs
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* that specifically request them.
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* @length: Total length of this structure including embedded tables
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* @vi_scale: log2 the number of VIs available on this VF. This quantity
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* is used by the hardware for register decoding.
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* @max_tx_channels: The maximum number of transmit queues the VF can use.
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* @rss_rxq_count: The number of receive queues present in the shared RSS
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* indirection table.
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* @peer_count: Total number of peers in the complete peer list. If larger
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* than ARRAY_SIZE(%peers), then the VF must provide sufficient
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* additional pages each of which is filled with vfdi_endpoint structures.
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* @local: The MAC address and outer VLAN tag of *this* VF
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* @peers: Table of peer addresses. The @tci fields in these structures
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* are currently unused and must be ignored. Additional peers are
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* written into any additional pages provided by the VF.
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* @timer_quantum_ns: Timer quantum (nominal period between timer ticks)
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* for interrupt moderation timers, in nanoseconds. This member is only
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* present if @length is sufficiently large.
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*/
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struct vfdi_status {
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u32 generation_start;
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u32 generation_end;
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u32 version;
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u32 length;
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u8 vi_scale;
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u8 max_tx_channels;
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u8 rss_rxq_count;
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u8 reserved1;
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u16 peer_count;
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u16 reserved2;
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struct vfdi_endpoint local;
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struct vfdi_endpoint peers[256];
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/* Members below here extend version 1 of this structure */
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u32 timer_quantum_ns;
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};
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#endif
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