--- /dev/null
+/*
+ * BSD LICENSE
+ *
+ * Copyright (C) Cavium networks Ltd. 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 networks 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 = {.u64 = 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->msg, hdr->coproc, 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);
+}
git.droids-corp.org / dpdk.git / commitdiff