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- cvmx-pko.h
/***********************license start***************
* Author: Cavium Networks
*
* Contact: support@caviumnetworks.com
* This file is part of the OCTEON SDK
*
* Copyright (c) 2003-2008 Cavium Networks
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, Version 2, as
* published by the Free Software Foundation.
*
* This file is distributed in the hope that it will be useful, but
* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
* NONINFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this file; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* or visit http://www.gnu.org/licenses/.
*
* This file may also be available under a different license from Cavium.
* Contact Cavium Networks for more information
***********************license end**************************************/
/**
*
* Interface to the hardware Packet Output unit.
*
* Starting with SDK 1.7.0, the PKO output functions now support
* two types of locking. CVMX_PKO_LOCK_ATOMIC_TAG continues to
* function similarly to previous SDKs by using POW atomic tags
* to preserve ordering and exclusivity. As a new option, you
* can now pass CVMX_PKO_LOCK_CMD_QUEUE which uses a ll/sc
* memory based locking instead. This locking has the advantage
* of not affecting the tag state but doesn't preserve packet
* ordering. CVMX_PKO_LOCK_CMD_QUEUE is appropriate in most
* generic code while CVMX_PKO_LOCK_CMD_QUEUE should be used
* with hand tuned fast path code.
*
* Some of other SDK differences visible to the command command
* queuing:
* - PKO indexes are no longer stored in the FAU. A large
* percentage of the FAU register block used to be tied up
* maintaining PKO queue pointers. These are now stored in a
* global named block.
* - The PKO <b>use_locking</b> parameter can now have a global
* effect. Since all application use the same named block,
* queue locking correctly applies across all operating
* systems when using CVMX_PKO_LOCK_CMD_QUEUE.
* - PKO 3 word commands are now supported. Use
* cvmx_pko_send_packet_finish3().
*
*/
#ifndef __CVMX_PKO_H__
#define __CVMX_PKO_H__
#include <asm/octeon/cvmx-fpa.h>
#include <asm/octeon/cvmx-pow.h>
#include <asm/octeon/cvmx-cmd-queue.h>
#include <asm/octeon/cvmx-pko-defs.h>
/* Adjust the command buffer size by 1 word so that in the case of using only
* two word PKO commands no command words stradle buffers. The useful values
* for this are 0 and 1. */
#define CVMX_PKO_COMMAND_BUFFER_SIZE_ADJUST (1)
#define CVMX_PKO_MAX_OUTPUT_QUEUES_STATIC 256
#define CVMX_PKO_MAX_OUTPUT_QUEUES ((OCTEON_IS_MODEL(OCTEON_CN31XX) || \
OCTEON_IS_MODEL(OCTEON_CN3010) || OCTEON_IS_MODEL(OCTEON_CN3005) || \
OCTEON_IS_MODEL(OCTEON_CN50XX)) ? 32 : \
(OCTEON_IS_MODEL(OCTEON_CN58XX) || \
OCTEON_IS_MODEL(OCTEON_CN56XX)) ? 256 : 128)
#define CVMX_PKO_NUM_OUTPUT_PORTS 40
/* use this for queues that are not used */
#define CVMX_PKO_MEM_QUEUE_PTRS_ILLEGAL_PID 63
#define CVMX_PKO_QUEUE_STATIC_PRIORITY 9
#define CVMX_PKO_ILLEGAL_QUEUE 0xFFFF
#define CVMX_PKO_MAX_QUEUE_DEPTH 0
typedef enum {
CVMX_PKO_SUCCESS,
CVMX_PKO_INVALID_PORT,
CVMX_PKO_INVALID_QUEUE,
CVMX_PKO_INVALID_PRIORITY,
CVMX_PKO_NO_MEMORY,
CVMX_PKO_PORT_ALREADY_SETUP,
CVMX_PKO_CMD_QUEUE_INIT_ERROR
} cvmx_pko_status_t;
/**
* This enumeration represents the differnet locking modes supported by PKO.
*/
typedef enum {
/*
* PKO doesn't do any locking. It is the responsibility of the
* application to make sure that no other core is accessing
* the same queue at the same time
*/
CVMX_PKO_LOCK_NONE = 0,
/*
* PKO performs an atomic tagswitch to insure exclusive access
* to the output queue. This will maintain packet ordering on
* output.
*/
CVMX_PKO_LOCK_ATOMIC_TAG = 1,
/*
* PKO uses the common command queue locks to insure exclusive
* access to the output queue. This is a memory based
* ll/sc. This is the most portable locking mechanism.
*/
CVMX_PKO_LOCK_CMD_QUEUE = 2,
} cvmx_pko_lock_t;
typedef struct {
uint32_t packets;
uint64_t octets;
uint64_t doorbell;
} cvmx_pko_port_status_t;
/**
* This structure defines the address to use on a packet enqueue
*/
typedef union {
uint64_t u64;
struct {
/* Must CVMX_IO_SEG */
uint64_t mem_space:2;
/* Must be zero */
uint64_t reserved:13;
/* Must be one */
uint64_t is_io:1;
/* The ID of the device on the non-coherent bus */
uint64_t did:8;
/* Must be zero */
uint64_t reserved2:4;
/* Must be zero */
uint64_t reserved3:18;
/*
* The hardware likes to have the output port in
* addition to the output queue,
*/
uint64_t port:6;
/*
* The output queue to send the packet to (0-127 are
* legal)
*/
uint64_t queue:9;
/* Must be zero */
uint64_t reserved4:3;
} s;
} cvmx_pko_doorbell_address_t;
/**
* Structure of the first packet output command word.
*/
typedef union {
uint64_t u64;
struct {
/*
* The size of the reg1 operation - could be 8, 16,
* 32, or 64 bits.
*/
uint64_t size1:2;
/*
* The size of the reg0 operation - could be 8, 16,
* 32, or 64 bits.
*/
uint64_t size0:2;
/*
* If set, subtract 1, if clear, subtract packet
* size.
*/
uint64_t subone1:1;
/*
* The register, subtract will be done if reg1 is
* non-zero.
*/
uint64_t reg1:11;
/* If set, subtract 1, if clear, subtract packet size */
uint64_t subone0:1;
/* The register, subtract will be done if reg0 is non-zero */
uint64_t reg0:11;
/*
* When set, interpret segment pointer and segment
* bytes in little endian order.
*/
uint64_t le:1;
/*
* When set, packet data not allocated in L2 cache by
* PKO.
*/
uint64_t n2:1;
/*
* If set and rsp is set, word3 contains a pointer to
* a work queue entry.
*/
uint64_t wqp:1;
/* If set, the hardware will send a response when done */
uint64_t rsp:1;
/*
* If set, the supplied pkt_ptr is really a pointer to
* a list of pkt_ptr's.
*/
uint64_t gather:1;
/*
* If ipoffp1 is non zero, (ipoffp1-1) is the number
* of bytes to IP header, and the hardware will
* calculate and insert the UDP/TCP checksum.
*/
uint64_t ipoffp1:7;
/*
* If set, ignore the I bit (force to zero) from all
* pointer structures.
*/
uint64_t ignore_i:1;
/*
* If clear, the hardware will attempt to free the
* buffers containing the packet.
*/
uint64_t dontfree:1;
/*
* The total number of segs in the packet, if gather
* set, also gather list length.
*/
uint64_t segs:6;
/* Including L2, but no trailing CRC */
uint64_t total_bytes:16;
} s;
} cvmx_pko_command_word0_t;
/* CSR typedefs have been moved to cvmx-csr-*.h */
/**
* Definition of internal state for Packet output processing
*/
typedef struct {
/* ptr to start of buffer, offset kept in FAU reg */
uint64_t *start_ptr;
} cvmx_pko_state_elem_t;
/**
* Call before any other calls to initialize the packet
* output system.
*/
extern void cvmx_pko_initialize_global(void);
extern int cvmx_pko_initialize_local(void);
/**
* Enables the packet output hardware. It must already be
* configured.
*/
extern void cvmx_pko_enable(void);
/**
* Disables the packet output. Does not affect any configuration.
*/
extern void cvmx_pko_disable(void);
/**
* Shutdown and free resources required by packet output.
*/
extern void cvmx_pko_shutdown(void);
/**
* Configure a output port and the associated queues for use.
*
* @port: Port to configure.
* @base_queue: First queue number to associate with this port.
* @num_queues: Number of queues t oassociate with this port
* @priority: Array of priority levels for each queue. Values are
* allowed to be 1-8. A value of 8 get 8 times the traffic
* of a value of 1. There must be num_queues elements in the
* array.
*/
extern cvmx_pko_status_t cvmx_pko_config_port(uint64_t port,
uint64_t base_queue,
uint64_t num_queues,
const uint64_t priority[]);
/**
* Ring the packet output doorbell. This tells the packet
* output hardware that "len" command words have been added
* to its pending list. This command includes the required
* CVMX_SYNCWS before the doorbell ring.
*
* @port: Port the packet is for
* @queue: Queue the packet is for
* @len: Length of the command in 64 bit words
*/
static inline void cvmx_pko_doorbell(uint64_t port, uint64_t queue,
uint64_t len)
{
cvmx_pko_doorbell_address_t ptr;
ptr.u64 = 0;
ptr.s.mem_space = CVMX_IO_SEG;
ptr.s.did = CVMX_OCT_DID_PKT_SEND;
ptr.s.is_io = 1;
ptr.s.port = port;
ptr.s.queue = queue;
/*
* Need to make sure output queue data is in DRAM before
* doorbell write.
*/
CVMX_SYNCWS;
cvmx_write_io(ptr.u64, len);
}
/**
* Prepare to send a packet. This may initiate a tag switch to
* get exclusive access to the output queue structure, and
* performs other prep work for the packet send operation.
*
* cvmx_pko_send_packet_finish() MUST be called after this function is called,
* and must be called with the same port/queue/use_locking arguments.
*
* The use_locking parameter allows the caller to use three
* possible locking modes.
* - CVMX_PKO_LOCK_NONE
* - PKO doesn't do any locking. It is the responsibility
* of the application to make sure that no other core
* is accessing the same queue at the same time.
* - CVMX_PKO_LOCK_ATOMIC_TAG
* - PKO performs an atomic tagswitch to insure exclusive
* access to the output queue. This will maintain
* packet ordering on output.
* - CVMX_PKO_LOCK_CMD_QUEUE
* - PKO uses the common command queue locks to insure
* exclusive access to the output queue. This is a
* memory based ll/sc. This is the most portable
* locking mechanism.
*
* NOTE: If atomic locking is used, the POW entry CANNOT be
* descheduled, as it does not contain a valid WQE pointer.
*
* @port: Port to send it on
* @queue: Queue to use
* @use_locking: CVMX_PKO_LOCK_NONE, CVMX_PKO_LOCK_ATOMIC_TAG, or
* CVMX_PKO_LOCK_CMD_QUEUE
*/
static inline void cvmx_pko_send_packet_prepare(uint64_t port, uint64_t queue,
cvmx_pko_lock_t use_locking)
{
if (use_locking == CVMX_PKO_LOCK_ATOMIC_TAG) {
/*
* Must do a full switch here to handle all cases. We
* use a fake WQE pointer, as the POW does not access
* this memory. The WQE pointer and group are only
* used if this work is descheduled, which is not
* supported by the
* cvmx_pko_send_packet_prepare/cvmx_pko_send_packet_finish
* combination. Note that this is a special case in
* which these fake values can be used - this is not a
* general technique.
*/
uint32_t tag =
CVMX_TAG_SW_BITS_INTERNAL << CVMX_TAG_SW_SHIFT |
CVMX_TAG_SUBGROUP_PKO << CVMX_TAG_SUBGROUP_SHIFT |
(CVMX_TAG_SUBGROUP_MASK & queue);
cvmx_pow_tag_sw_full((cvmx_wqe_t *) cvmx_phys_to_ptr(0x80), tag,
CVMX_POW_TAG_TYPE_ATOMIC, 0);
}
}
/**
* Complete packet output. cvmx_pko_send_packet_prepare() must be
* called exactly once before this, and the same parameters must be
* passed to both cvmx_pko_send_packet_prepare() and
* cvmx_pko_send_packet_finish().
*
* @port: Port to send it on
* @queue: Queue to use
* @pko_command:
* PKO HW command word
* @packet: Packet to send
* @use_locking: CVMX_PKO_LOCK_NONE, CVMX_PKO_LOCK_ATOMIC_TAG, or
* CVMX_PKO_LOCK_CMD_QUEUE
*
* Returns returns CVMX_PKO_SUCCESS on success, or error code on
* failure of output
*/
static inline cvmx_pko_status_t cvmx_pko_send_packet_finish(
uint64_t port,
uint64_t queue,
cvmx_pko_command_word0_t pko_command,
union cvmx_buf_ptr packet,
cvmx_pko_lock_t use_locking)
{
cvmx_cmd_queue_result_t result;
if (use_locking == CVMX_PKO_LOCK_ATOMIC_TAG)
cvmx_pow_tag_sw_wait();
result = cvmx_cmd_queue_write2(CVMX_CMD_QUEUE_PKO(queue),
(use_locking == CVMX_PKO_LOCK_CMD_QUEUE),
pko_command.u64, packet.u64);
if (likely(result == CVMX_CMD_QUEUE_SUCCESS)) {
cvmx_pko_doorbell(port, queue, 2);
return CVMX_PKO_SUCCESS;
} else if ((result == CVMX_CMD_QUEUE_NO_MEMORY)
|| (result == CVMX_CMD_QUEUE_FULL)) {
return CVMX_PKO_NO_MEMORY;
} else {
return CVMX_PKO_INVALID_QUEUE;
}
}
/**
* Complete packet output. cvmx_pko_send_packet_prepare() must be
* called exactly once before this, and the same parameters must be
* passed to both cvmx_pko_send_packet_prepare() and
* cvmx_pko_send_packet_finish().
*
* @port: Port to send it on
* @queue: Queue to use
* @pko_command:
* PKO HW command word
* @packet: Packet to send
* @addr: Plysical address of a work queue entry or physical address
* to zero on complete.
* @use_locking: CVMX_PKO_LOCK_NONE, CVMX_PKO_LOCK_ATOMIC_TAG, or
* CVMX_PKO_LOCK_CMD_QUEUE
*
* Returns returns CVMX_PKO_SUCCESS on success, or error code on
* failure of output
*/
static inline cvmx_pko_status_t cvmx_pko_send_packet_finish3(
uint64_t port,
uint64_t queue,
cvmx_pko_command_word0_t pko_command,
union cvmx_buf_ptr packet,
uint64_t addr,
cvmx_pko_lock_t use_locking)
{
cvmx_cmd_queue_result_t result;
if (use_locking == CVMX_PKO_LOCK_ATOMIC_TAG)
cvmx_pow_tag_sw_wait();
result = cvmx_cmd_queue_write3(CVMX_CMD_QUEUE_PKO(queue),
(use_locking == CVMX_PKO_LOCK_CMD_QUEUE),
pko_command.u64, packet.u64, addr);
if (likely(result == CVMX_CMD_QUEUE_SUCCESS)) {
cvmx_pko_doorbell(port, queue, 3);
return CVMX_PKO_SUCCESS;
} else if ((result == CVMX_CMD_QUEUE_NO_MEMORY)
|| (result == CVMX_CMD_QUEUE_FULL)) {
return CVMX_PKO_NO_MEMORY;
} else {
return CVMX_PKO_INVALID_QUEUE;
}
}
/**
* Return the pko output queue associated with a port and a specific core.
* In normal mode (PKO lockless operation is disabled), the value returned
* is the base queue.
*
* @port: Port number
* @core: Core to get queue for
*
* Returns Core-specific output queue
*/
static inline int cvmx_pko_get_base_queue_per_core(int port, int core)
{
#ifndef CVMX_HELPER_PKO_MAX_PORTS_INTERFACE0
#define CVMX_HELPER_PKO_MAX_PORTS_INTERFACE0 16
#endif
#ifndef CVMX_HELPER_PKO_MAX_PORTS_INTERFACE1
#define CVMX_HELPER_PKO_MAX_PORTS_INTERFACE1 16
#endif
if (port < CVMX_PKO_MAX_PORTS_INTERFACE0)
return port * CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 + core;
else if (port >= 16 && port < 16 + CVMX_PKO_MAX_PORTS_INTERFACE1)
return CVMX_PKO_MAX_PORTS_INTERFACE0 *
CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 + (port -
16) *
CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 + core;
else if ((port >= 32) && (port < 36))
return CVMX_PKO_MAX_PORTS_INTERFACE0 *
CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 +
CVMX_PKO_MAX_PORTS_INTERFACE1 *
CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 + (port -
32) *
CVMX_PKO_QUEUES_PER_PORT_PCI;
else if ((port >= 36) && (port < 40))
return CVMX_PKO_MAX_PORTS_INTERFACE0 *
CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 +
CVMX_PKO_MAX_PORTS_INTERFACE1 *
CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 +
4 * CVMX_PKO_QUEUES_PER_PORT_PCI + (port -
36) *
CVMX_PKO_QUEUES_PER_PORT_LOOP;
else
/* Given the limit on the number of ports we can map to
* CVMX_MAX_OUTPUT_QUEUES_STATIC queues (currently 256,
* divided among all cores), the remaining unmapped ports
* are assigned an illegal queue number */
return CVMX_PKO_ILLEGAL_QUEUE;
}
/**
* For a given port number, return the base pko output queue
* for the port.
*
* @port: Port number
* Returns Base output queue
*/
static inline int cvmx_pko_get_base_queue(int port)
{
return cvmx_pko_get_base_queue_per_core(port, 0);
}
/**
* For a given port number, return the number of pko output queues.
*
* @port: Port number
* Returns Number of output queues
*/
static inline int cvmx_pko_get_num_queues(int port)
{
if (port < 16)
return CVMX_PKO_QUEUES_PER_PORT_INTERFACE0;
else if (port < 32)
return CVMX_PKO_QUEUES_PER_PORT_INTERFACE1;
else if (port < 36)
return CVMX_PKO_QUEUES_PER_PORT_PCI;
else if (port < 40)
return CVMX_PKO_QUEUES_PER_PORT_LOOP;
else
return 0;
}
/**
* Get the status counters for a port.
*
* @port_num: Port number to get statistics for.
* @clear: Set to 1 to clear the counters after they are read
* @status: Where to put the results.
*/
static inline void cvmx_pko_get_port_status(uint64_t port_num, uint64_t clear,
cvmx_pko_port_status_t *status)
{
union cvmx_pko_reg_read_idx pko_reg_read_idx;
union cvmx_pko_mem_count0 pko_mem_count0;
union cvmx_pko_mem_count1 pko_mem_count1;
pko_reg_read_idx.u64 = 0;
pko_reg_read_idx.s.index = port_num;
cvmx_write_csr(CVMX_PKO_REG_READ_IDX, pko_reg_read_idx.u64);
pko_mem_count0.u64 = cvmx_read_csr(CVMX_PKO_MEM_COUNT0);
status->packets = pko_mem_count0.s.count;
if (clear) {
pko_mem_count0.s.count = port_num;
cvmx_write_csr(CVMX_PKO_MEM_COUNT0, pko_mem_count0.u64);
}
pko_mem_count1.u64 = cvmx_read_csr(CVMX_PKO_MEM_COUNT1);
status->octets = pko_mem_count1.s.count;
if (clear) {
pko_mem_count1.s.count = port_num;
cvmx_write_csr(CVMX_PKO_MEM_COUNT1, pko_mem_count1.u64);
}
if (OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
union cvmx_pko_mem_debug9 debug9;
pko_reg_read_idx.s.index = cvmx_pko_get_base_queue(port_num);
cvmx_write_csr(CVMX_PKO_REG_READ_IDX, pko_reg_read_idx.u64);
debug9.u64 = cvmx_read_csr(CVMX_PKO_MEM_DEBUG9);
status->doorbell = debug9.cn38xx.doorbell;
} else {
union cvmx_pko_mem_debug8 debug8;
pko_reg_read_idx.s.index = cvmx_pko_get_base_queue(port_num);
cvmx_write_csr(CVMX_PKO_REG_READ_IDX, pko_reg_read_idx.u64);
debug8.u64 = cvmx_read_csr(CVMX_PKO_MEM_DEBUG8);
status->doorbell = debug8.cn58xx.doorbell;
}
}
/**
* Rate limit a PKO port to a max packets/sec. This function is only
* supported on CN57XX, CN56XX, CN55XX, and CN54XX.
*
* @port: Port to rate limit
* @packets_s: Maximum packet/sec
* @burst: Maximum number of packets to burst in a row before rate
* limiting cuts in.
*
* Returns Zero on success, negative on failure
*/
extern int cvmx_pko_rate_limit_packets(int port, int packets_s, int burst);
/**
* Rate limit a PKO port to a max bits/sec. This function is only
* supported on CN57XX, CN56XX, CN55XX, and CN54XX.
*
* @port: Port to rate limit
* @bits_s: PKO rate limit in bits/sec
* @burst: Maximum number of bits to burst before rate
* limiting cuts in.
*
* Returns Zero on success, negative on failure
*/
extern int cvmx_pko_rate_limit_bits(int port, uint64_t bits_s, int burst);
#endif /* __CVMX_PKO_H__ */