freebsd-dev/sys/dev/iscsi/icl_conn_if.m
John Baldwin 7aab9c14a4 iscsi: Handle unmapped I/O requests.
Don't assume that csio->data_ptr is pointer to a data buffer that can
be passed to icl_get_pdu_data and icl_append_data.  For unmapped I/O
requests, csio->data_ptr is instead a pointer to a struct bio as
indicated by CAM_DATA_BIO.  To support these requests, add
icl_pdu_append_bio and icl_pdu_get_bio methods which pass a pointer to
the bio and an offset and length relative to the bio's buffer.

Note that only backends supporting unmapped requests need to implement
these hooks.

Implement simple no-op hooks for the iser backend.

Reviewed by:	mav
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D34382
2022-03-10 15:49:53 -08:00

159 lines
3.4 KiB
Objective-C

#-
# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
#
# Copyright (c) 2014 The FreeBSD Foundation
#
# This software was developed by Edward Tomasz Napierala under sponsorship
# from the FreeBSD Foundation.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. 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.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
#
# $FreeBSD$
#
#include <sys/bio.h>
#include <sys/socket.h>
#include <dev/iscsi/icl.h>
INTERFACE icl_conn;
CODE {
static void null_pdu_queue_cb(struct icl_conn *ic,
struct icl_pdu *ip, icl_pdu_cb cb)
{
ICL_CONN_PDU_QUEUE(ic, ip);
if (cb)
cb(ip, 0);
}
};
METHOD size_t pdu_data_segment_length {
struct icl_conn *_ic;
const struct icl_pdu *_ip;
};
METHOD int pdu_append_bio {
struct icl_conn *_ic;
struct icl_pdu *_ip;
struct bio *_bp;
size_t _offset;
size_t _len;
int _flags;
};
METHOD int pdu_append_data {
struct icl_conn *_ic;
struct icl_pdu *_ip;
const void *_addr;
size_t _len;
int _flags;
};
METHOD void pdu_get_bio {
struct icl_conn *_ic;
struct icl_pdu *_ip;
size_t _pdu_off;
struct bio *_bp;
size_t _bio_off;
size_t _len;
};
METHOD void pdu_get_data {
struct icl_conn *_ic;
struct icl_pdu *_ip;
size_t _off;
void *_addr;
size_t _len;
};
METHOD void pdu_queue {
struct icl_conn *_ic;
struct icl_pdu *_ip;
};
METHOD void pdu_queue_cb {
struct icl_conn *_ic;
struct icl_pdu *_ip;
icl_pdu_cb cb;
} DEFAULT null_pdu_queue_cb;
METHOD void pdu_free {
struct icl_conn *_ic;
struct icl_pdu *_ip;
};
METHOD struct icl_pdu * new_pdu {
struct icl_conn *_ic;
int _flags;
};
METHOD void free {
struct icl_conn *_ic;
};
METHOD int handoff {
struct icl_conn *_ic;
int _fd;
};
METHOD void close {
struct icl_conn *_ic;
};
METHOD int task_setup {
struct icl_conn *_ic;
struct icl_pdu *_ip;
struct ccb_scsiio *_csio;
uint32_t *_task_tag;
void **_prvp;
};
METHOD void task_done {
struct icl_conn *_ic;
void *_prv;
};
METHOD int transfer_setup {
struct icl_conn *_ic;
struct icl_pdu *_ip;
union ctl_io *_io;
uint32_t *_transfer_tag;
void **_prvp;
};
METHOD void transfer_done {
struct icl_conn *_ic;
void *_prv;
};
#
# The function below is only used with ICL_KERNEL_PROXY.
#
METHOD int connect {
struct icl_conn *_ic;
int _domain;
int _socktype;
int _protocol;
struct sockaddr *_from_sa;
struct sockaddr *_to_sa;
};