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spdk.go
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spdk.go
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//
// (C) Copyright 2018-2019 Intel Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// GOVERNMENT LICENSE RIGHTS-OPEN SOURCE SOFTWARE
// The Government's rights to use, modify, reproduce, release, perform, display,
// or disclose this software are subject to the terms of the Apache License as
// provided in Contract No. 8F-30005.
// Any reproduction of computer software, computer software documentation, or
// portions thereof marked with this legend must also reproduce the markings.
//
// Package spdk provides Go bindings for SPDK
package spdk
// CGO_CFLAGS & CGO_LDFLAGS env vars can be used
// to specify additional dirs.
/*
#cgo LDFLAGS: -lspdk_env_dpdk -lrte_mempool -lrte_mempool_ring -lrte_bus_pci
#cgo LDFLAGS: -lrte_pci -lrte_ring -lrte_mbuf -lrte_eal -lrte_kvargs -ldl -lnuma
#include "stdlib.h"
#include "spdk/stdinc.h"
#include "spdk/env.h"
*/
import "C"
import (
"fmt"
)
// ENV is the interface that provides SPDK environment management.
type ENV interface {
InitSPDKEnv(int) error
}
// Env is a simple ENV implementation.
type Env struct{}
// Rc2err returns an failure if rc != 0.
//
// TODO: If err is already set then it is wrapped,
// otherwise it is ignored. e.g.
// func Rc2err(label string, rc C.int, err error) error {
func Rc2err(label string, rc C.int) error {
if rc != 0 {
if rc < 0 {
rc = -rc
}
// e := errors.Error(rc)
return fmt.Errorf("%s: %d", label, rc) // e
}
return nil
}
// InitSPDKEnv initializes the SPDK environment.
//
// SPDK relies on an abstraction around the local environment
// named env that handles memory allocation and PCI device operations.
// The library must be initialized first.
func (e *Env) InitSPDKEnv(shmID int) (err error) {
opts := &C.struct_spdk_env_opts{}
C.spdk_env_opts_init(opts)
// shmID 0 will be ignored
if shmID > 0 {
opts.shm_id = C.int(shmID)
}
rc := C.spdk_env_init(opts)
if err = Rc2err("spdk_env_opts_init", rc); err != nil {
return
}
return
}