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/*
* BSD LICENSE
*
* Copyright (C) Cavium, Inc. 2017.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Cavium, Inc nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <string.h>
#include <rte_atomic.h>
#include <rte_common.h>
#include <rte_cycles.h>
#include <rte_io.h>
#include <rte_spinlock.h>
#include "ssovf_evdev.h"
/* Mbox operation timeout in seconds */
#define MBOX_WAIT_TIME_SEC 3
#define MAX_RAM_MBOX_LEN ((SSOW_BAR4_LEN >> 1) - 8 /* Mbox header */)
/* Mbox channel state */
enum {
MBOX_CHAN_STATE_REQ = 1,
MBOX_CHAN_STATE_RES = 0,
};
/* Response messages */
enum {
MBOX_RET_SUCCESS,
MBOX_RET_INVALID,
MBOX_RET_INTERNAL_ERR,
};
struct mbox {
int init_once;
uint8_t *ram_mbox_base; /* Base address of mbox message stored in ram */
uint8_t *reg; /* Store to this register triggers PF mbox interrupt */
uint16_t tag_own; /* Last tag which was written to own channel */
rte_spinlock_t lock;
};
static struct mbox octeontx_mbox;
/*
* Structure used for mbox synchronization
* This structure sits at the begin of Mbox RAM and used as main
* synchronization point for channel communication
*/
struct mbox_ram_hdr {
union {
uint64_t u64;
struct {
uint8_t chan_state : 1;
uint8_t coproc : 7;
uint8_t msg;
uint8_t vfid;
uint8_t res_code;
uint16_t tag;
uint16_t len;
};
};
};
static inline void
mbox_send_request(struct mbox *m, struct octeontx_mbox_hdr *hdr,
const void *txmsg, uint16_t txsize)
{
struct mbox_ram_hdr old_hdr;
struct mbox_ram_hdr new_hdr = { {0} };
uint64_t *ram_mbox_hdr = (uint64_t *)m->ram_mbox_base;
uint8_t *ram_mbox_msg = m->ram_mbox_base + sizeof(struct mbox_ram_hdr);
/*
* Initialize the channel with the tag left by last send.
* On success full mbox send complete, PF increments the tag by one.
* The sender can validate integrity of PF message with this scheme
*/
old_hdr.u64 = rte_read64(ram_mbox_hdr);
m->tag_own = (old_hdr.tag + 2) & (~0x1ul); /* next even number */
/* Copy msg body */
if (txmsg)
memcpy(ram_mbox_msg, txmsg, txsize);
/* Prepare new hdr */
new_hdr.chan_state = MBOX_CHAN_STATE_REQ;
new_hdr.coproc = hdr->coproc;
new_hdr.msg = hdr->msg;
new_hdr.vfid = hdr->vfid;
new_hdr.tag = m->tag_own;
new_hdr.len = txsize;
/* Write the msg header */
rte_write64(new_hdr.u64, ram_mbox_hdr);
rte_io_wmb();
/* Notify PF about the new msg - write to MBOX reg generates PF IRQ */
rte_write64(0, m->reg);
}
static inline int
mbox_wait_response(struct mbox *m, struct octeontx_mbox_hdr *hdr,
void *rxmsg, uint16_t rxsize)
{
int res = 0, wait;
uint16_t len;
struct mbox_ram_hdr rx_hdr;
uint64_t *ram_mbox_hdr = (uint64_t *)m->ram_mbox_base;
uint8_t *ram_mbox_msg = m->ram_mbox_base + sizeof(struct mbox_ram_hdr);
/* Wait for response */
wait = MBOX_WAIT_TIME_SEC * 1000 * 10;
while (wait > 0) {
rte_delay_us(100);
rx_hdr.u64 = rte_read64(ram_mbox_hdr);
if (rx_hdr.chan_state == MBOX_CHAN_STATE_RES)
break;
--wait;
}
hdr->res_code = rx_hdr.res_code;
m->tag_own++;
/* Timeout */
if (wait <= 0) {
res = -ETIMEDOUT;
goto error;
}
/* Tag mismatch */
if (m->tag_own != rx_hdr.tag) {
res = -EINVAL;
goto error;
}
/* PF nacked the msg */
if (rx_hdr.res_code != MBOX_RET_SUCCESS) {
res = -EBADMSG;
goto error;
}
len = RTE_MIN(rx_hdr.len, rxsize);
if (rxmsg)
memcpy(rxmsg, ram_mbox_msg, len);
return len;
error:
ssovf_log_err("Failed to send mbox(%d/%d) coproc=%d msg=%d ret=(%d,%d)",
m->tag_own, rx_hdr.tag, hdr->coproc, hdr->msg, res,
hdr->res_code);
return res;
}
static inline int
mbox_send(struct mbox *m, struct octeontx_mbox_hdr *hdr, const void *txmsg,
uint16_t txsize, void *rxmsg, uint16_t rxsize)
{
int res = -EINVAL;
if (m->init_once == 0 || hdr == NULL ||
txsize > MAX_RAM_MBOX_LEN || rxsize > MAX_RAM_MBOX_LEN) {
ssovf_log_err("Invalid init_once=%d hdr=%p txsz=%d rxsz=%d",
m->init_once, hdr, txsize, rxsize);
return res;
}
rte_spinlock_lock(&m->lock);
mbox_send_request(m, hdr, txmsg, txsize);
res = mbox_wait_response(m, hdr, rxmsg, rxsize);
rte_spinlock_unlock(&m->lock);
return res;
}
static inline int
mbox_setup(struct mbox *m)
{
if (unlikely(m->init_once == 0)) {
rte_spinlock_init(&m->lock);
m->ram_mbox_base = octeontx_ssovf_bar(OCTEONTX_SSO_HWS, 0, 4);
m->reg = octeontx_ssovf_bar(OCTEONTX_SSO_GROUP, 0, 0);
m->reg += SSO_VHGRP_PF_MBOX(1);
if (m->ram_mbox_base == NULL || m->reg == NULL) {
ssovf_log_err("Invalid ram_mbox_base=%p or reg=%p",
m->ram_mbox_base, m->reg);
return -EINVAL;
}
m->init_once = 1;
}
return 0;
}
int
octeontx_ssovf_mbox_send(struct octeontx_mbox_hdr *hdr, void *txdata,
uint16_t txlen, void *rxdata, uint16_t rxlen)
{
struct mbox *m = &octeontx_mbox;
RTE_BUILD_BUG_ON(sizeof(struct mbox_ram_hdr) != 8);
if (rte_eal_process_type() != RTE_PROC_PRIMARY || mbox_setup(m))
return -EINVAL;
return mbox_send(m, hdr, txdata, txlen, rxdata, rxlen);
}
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