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5e93cbadd3
When a data path reset is initiated, write control to the PCIE_GMBX is yanked from the switch manager. The switch manager writes to this register to clear mailbox global interrupt bits as part of its mailbox interrupt handling routine. When the device recovers from the data path reset and these bits are not cleared, it will prevent future mailbox global interrupts from being triggered. Upon confirming that the device has exited from a data path reset, clear these bits to ensure the proper functioning of the mailbox global interrupt. Signed-off-by: Ngai-Mint Kwan <ngai-mint.kwan@intel.com> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
312 lines
12 KiB
C
312 lines
12 KiB
C
/* Intel(R) Ethernet Switch Host Interface Driver
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* Copyright(c) 2013 - 2016 Intel Corporation.
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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 and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*
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* Contact Information:
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* e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*/
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#ifndef _FM10K_MBX_H_
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#define _FM10K_MBX_H_
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/* forward declaration */
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struct fm10k_mbx_info;
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#include "fm10k_type.h"
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#include "fm10k_tlv.h"
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/* PF Mailbox Registers */
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#define FM10K_MBMEM(_n) ((_n) + 0x18000)
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#define FM10K_MBMEM_VF(_n, _m) (((_n) * 0x10) + (_m) + 0x18000)
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#define FM10K_MBMEM_SM(_n) ((_n) + 0x18400)
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#define FM10K_MBMEM_PF(_n) ((_n) + 0x18600)
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/* XOR provides means of switching from Tx to Rx FIFO */
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#define FM10K_MBMEM_PF_XOR (FM10K_MBMEM_SM(0) ^ FM10K_MBMEM_PF(0))
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#define FM10K_MBX(_n) ((_n) + 0x18800)
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#define FM10K_MBX_REQ 0x00000002
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#define FM10K_MBX_ACK 0x00000004
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#define FM10K_MBX_REQ_INTERRUPT 0x00000008
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#define FM10K_MBX_ACK_INTERRUPT 0x00000010
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#define FM10K_MBX_INTERRUPT_ENABLE 0x00000020
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#define FM10K_MBX_INTERRUPT_DISABLE 0x00000040
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#define FM10K_MBX_GLOBAL_REQ_INTERRUPT 0x00000200
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#define FM10K_MBX_GLOBAL_ACK_INTERRUPT 0x00000400
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#define FM10K_MBICR(_n) ((_n) + 0x18840)
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#define FM10K_GMBX 0x18842
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/* VF Mailbox Registers */
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#define FM10K_VFMBX 0x00010
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#define FM10K_VFMBMEM(_n) ((_n) + 0x00020)
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#define FM10K_VFMBMEM_LEN 16
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#define FM10K_VFMBMEM_VF_XOR (FM10K_VFMBMEM_LEN / 2)
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/* Delays/timeouts */
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#define FM10K_MBX_DISCONNECT_TIMEOUT 500
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#define FM10K_MBX_POLL_DELAY 19
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#define FM10K_MBX_INT_DELAY 20
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/* PF/VF Mailbox state machine
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*
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* +----------+ connect() +----------+
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* | CLOSED | --------------> | CONNECT |
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* +----------+ +----------+
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* ^ ^ |
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* | rcv: rcv: | | rcv:
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* | Connect Disconnect | | Connect
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* | Disconnect Error | | Data
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* | | |
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* | | V
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* +----------+ disconnect() +----------+
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* |DISCONNECT| <-------------- | OPEN |
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* +----------+ +----------+
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*
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* The diagram above describes the PF/VF mailbox state machine. There
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* are four main states to this machine.
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* Closed: This state represents a mailbox that is in a standby state
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* with interrupts disabled. In this state the mailbox should not
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* read the mailbox or write any data. The only means of exiting
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* this state is for the system to make the connect() call for the
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* mailbox, it will then transition to the connect state.
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* Connect: In this state the mailbox is seeking a connection. It will
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* post a connect message with no specified destination and will
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* wait for a reply from the other side of the mailbox. This state
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* is exited when either a connect with the local mailbox as the
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* destination is received or when a data message is received with
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* a valid sequence number.
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* Open: In this state the mailbox is able to transfer data between the local
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* entity and the remote. It will fall back to connect in the event of
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* receiving either an error message, or a disconnect message. It will
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* transition to disconnect on a call to disconnect();
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* Disconnect: In this state the mailbox is attempting to gracefully terminate
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* the connection. It will do so at the first point where it knows
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* that the remote endpoint is either done sending, or when the
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* remote endpoint has fallen back into connect.
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*/
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enum fm10k_mbx_state {
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FM10K_STATE_CLOSED,
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FM10K_STATE_CONNECT,
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FM10K_STATE_OPEN,
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FM10K_STATE_DISCONNECT,
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};
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/* PF/VF Mailbox header format
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* 3 2 1 0
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* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Size/Err_no/CRC | Rsvd0 | Head | Tail | Type |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* The layout above describes the format for the header used in the PF/VF
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* mailbox. The header is broken out into the following fields:
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* Type: There are 4 supported message types
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* 0x8: Data header - used to transport message data
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* 0xC: Connect header - used to establish connection
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* 0xD: Disconnect header - used to tear down a connection
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* 0xE: Error header - used to address message exceptions
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* Tail: Tail index for local FIFO
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* Tail index actually consists of two parts. The MSB of
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* the head is a loop tracker, it is 0 on an even numbered
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* loop through the FIFO, and 1 on the odd numbered loops.
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* To get the actual mailbox offset based on the tail it
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* is necessary to add bit 3 to bit 0 and clear bit 3. This
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* gives us a valid range of 0x1 - 0xE.
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* Head: Head index for remote FIFO
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* Head index follows the same format as the tail index.
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* Rsvd0: Reserved 0 portion of the mailbox header
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* CRC: Running CRC for all data since connect plus current message header
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* Size: Maximum message size - Applies only to connect headers
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* The maximum message size is provided during connect to avoid
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* jamming the mailbox with messages that do not fit.
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* Err_no: Error number - Applies only to error headers
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* The error number provides an indication of the type of error
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* experienced.
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*/
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/* macros for retrieving and setting header values */
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#define FM10K_MSG_HDR_MASK(name) \
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((0x1u << FM10K_MSG_##name##_SIZE) - 1)
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#define FM10K_MSG_HDR_FIELD_SET(value, name) \
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(((u32)(value) & FM10K_MSG_HDR_MASK(name)) << FM10K_MSG_##name##_SHIFT)
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#define FM10K_MSG_HDR_FIELD_GET(value, name) \
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((u16)((value) >> FM10K_MSG_##name##_SHIFT) & FM10K_MSG_HDR_MASK(name))
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/* offsets shared between all headers */
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#define FM10K_MSG_TYPE_SHIFT 0
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#define FM10K_MSG_TYPE_SIZE 4
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#define FM10K_MSG_TAIL_SHIFT 4
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#define FM10K_MSG_TAIL_SIZE 4
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#define FM10K_MSG_HEAD_SHIFT 8
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#define FM10K_MSG_HEAD_SIZE 4
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#define FM10K_MSG_RSVD0_SHIFT 12
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#define FM10K_MSG_RSVD0_SIZE 4
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/* offsets for data/disconnect headers */
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#define FM10K_MSG_CRC_SHIFT 16
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#define FM10K_MSG_CRC_SIZE 16
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/* offsets for connect headers */
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#define FM10K_MSG_CONNECT_SIZE_SHIFT 16
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#define FM10K_MSG_CONNECT_SIZE_SIZE 16
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/* offsets for error headers */
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#define FM10K_MSG_ERR_NO_SHIFT 16
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#define FM10K_MSG_ERR_NO_SIZE 16
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enum fm10k_msg_type {
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FM10K_MSG_DATA = 0x8,
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FM10K_MSG_CONNECT = 0xC,
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FM10K_MSG_DISCONNECT = 0xD,
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FM10K_MSG_ERROR = 0xE,
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};
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/* HNI/SM Mailbox FIFO format
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* 3 2 1 0
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* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
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* +-------+-----------------------+-------+-----------------------+
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* | Error | Remote Head |Version| Local Tail |
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* +-------+-----------------------+-------+-----------------------+
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* | |
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* . Local FIFO Data .
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* . .
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* +-------+-----------------------+-------+-----------------------+
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*
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* The layout above describes the format for the FIFOs used by the host
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* network interface and the switch manager to communicate messages back
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* and forth. Both the HNI and the switch maintain one such FIFO. The
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* layout in memory has the switch manager FIFO followed immediately by
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* the HNI FIFO. For this reason I am using just the pointer to the
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* HNI FIFO in the mailbox ops as the offset between the two is fixed.
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*
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* The header for the FIFO is broken out into the following fields:
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* Local Tail: Offset into FIFO region for next DWORD to write.
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* Version: Version info for mailbox, only values of 0/1 are supported.
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* Remote Head: Offset into remote FIFO to indicate how much we have read.
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* Error: Error indication, values TBD.
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*/
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/* version number for switch manager mailboxes */
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#define FM10K_SM_MBX_VERSION 1
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#define FM10K_SM_MBX_FIFO_LEN (FM10K_MBMEM_PF_XOR - 1)
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/* offsets shared between all SM FIFO headers */
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#define FM10K_MSG_SM_TAIL_SHIFT 0
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#define FM10K_MSG_SM_TAIL_SIZE 12
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#define FM10K_MSG_SM_VER_SHIFT 12
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#define FM10K_MSG_SM_VER_SIZE 4
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#define FM10K_MSG_SM_HEAD_SHIFT 16
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#define FM10K_MSG_SM_HEAD_SIZE 12
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#define FM10K_MSG_SM_ERR_SHIFT 28
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#define FM10K_MSG_SM_ERR_SIZE 4
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/* All error messages returned by mailbox functions
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* The value -511 is 0xFE01 in hex. The idea is to order the errors
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* from 0xFE01 - 0xFEFF so error codes are easily visible in the mailbox
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* messages. This also helps to avoid error number collisions as Linux
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* doesn't appear to use error numbers 256 - 511.
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*/
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#define FM10K_MBX_ERR(_n) ((_n) - 512)
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#define FM10K_MBX_ERR_NO_MBX FM10K_MBX_ERR(0x01)
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#define FM10K_MBX_ERR_NO_SPACE FM10K_MBX_ERR(0x03)
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#define FM10K_MBX_ERR_TAIL FM10K_MBX_ERR(0x05)
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#define FM10K_MBX_ERR_HEAD FM10K_MBX_ERR(0x06)
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#define FM10K_MBX_ERR_SRC FM10K_MBX_ERR(0x08)
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#define FM10K_MBX_ERR_TYPE FM10K_MBX_ERR(0x09)
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#define FM10K_MBX_ERR_SIZE FM10K_MBX_ERR(0x0B)
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#define FM10K_MBX_ERR_BUSY FM10K_MBX_ERR(0x0C)
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#define FM10K_MBX_ERR_RSVD0 FM10K_MBX_ERR(0x0E)
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#define FM10K_MBX_ERR_CRC FM10K_MBX_ERR(0x0F)
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#define FM10K_MBX_CRC_SEED 0xFFFF
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struct fm10k_mbx_ops {
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s32 (*connect)(struct fm10k_hw *, struct fm10k_mbx_info *);
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void (*disconnect)(struct fm10k_hw *, struct fm10k_mbx_info *);
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bool (*rx_ready)(struct fm10k_mbx_info *);
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bool (*tx_ready)(struct fm10k_mbx_info *, u16);
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bool (*tx_complete)(struct fm10k_mbx_info *);
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s32 (*enqueue_tx)(struct fm10k_hw *, struct fm10k_mbx_info *,
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const u32 *);
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s32 (*process)(struct fm10k_hw *, struct fm10k_mbx_info *);
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s32 (*register_handlers)(struct fm10k_mbx_info *,
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const struct fm10k_msg_data *);
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};
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struct fm10k_mbx_fifo {
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u32 *buffer;
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u16 head;
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u16 tail;
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u16 size;
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};
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/* size of buffer to be stored in mailbox for FIFOs */
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#define FM10K_MBX_TX_BUFFER_SIZE 512
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#define FM10K_MBX_RX_BUFFER_SIZE 128
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#define FM10K_MBX_BUFFER_SIZE \
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(FM10K_MBX_TX_BUFFER_SIZE + FM10K_MBX_RX_BUFFER_SIZE)
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/* minimum and maximum message size in dwords */
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#define FM10K_MBX_MSG_MAX_SIZE \
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((FM10K_MBX_TX_BUFFER_SIZE - 1) & (FM10K_MBX_RX_BUFFER_SIZE - 1))
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#define FM10K_VFMBX_MSG_MTU ((FM10K_VFMBMEM_LEN / 2) - 1)
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#define FM10K_MBX_INIT_TIMEOUT 2000 /* number of retries on mailbox */
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#define FM10K_MBX_INIT_DELAY 500 /* microseconds between retries */
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struct fm10k_mbx_info {
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/* function pointers for mailbox operations */
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struct fm10k_mbx_ops ops;
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const struct fm10k_msg_data *msg_data;
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/* message FIFOs */
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struct fm10k_mbx_fifo rx;
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struct fm10k_mbx_fifo tx;
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/* delay for handling timeouts */
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u32 timeout;
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u32 udelay;
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/* mailbox state info */
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u32 mbx_reg, mbmem_reg, mbx_lock, mbx_hdr;
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u16 max_size, mbmem_len;
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u16 tail, tail_len, pulled;
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u16 head, head_len, pushed;
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u16 local, remote;
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enum fm10k_mbx_state state;
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/* result of last mailbox test */
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s32 test_result;
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/* statistics */
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u64 tx_busy;
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u64 tx_dropped;
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u64 tx_messages;
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u64 tx_dwords;
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u64 tx_mbmem_pulled;
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u64 rx_messages;
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u64 rx_dwords;
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u64 rx_mbmem_pushed;
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u64 rx_parse_err;
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/* Buffer to store messages */
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u32 buffer[FM10K_MBX_BUFFER_SIZE];
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};
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s32 fm10k_pfvf_mbx_init(struct fm10k_hw *, struct fm10k_mbx_info *,
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const struct fm10k_msg_data *, u8);
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s32 fm10k_sm_mbx_init(struct fm10k_hw *, struct fm10k_mbx_info *,
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const struct fm10k_msg_data *);
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#endif /* _FM10K_MBX_H_ */
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