c261b6ea4e
When using iSCSI PDU offload (cxgbei) on T6 adapters, a burst of received PDUs can be reported via a single message to the driver. Previously the driver passed these multi-PDU bursts up to the iSCSI stack up as a single "large" PDU by rewriting the buffer offset, data segment length, and DataSN fields in the iSCSI header. The DataSN field in particular was rewritten so that each of the "large" PDUs used consecutively increasing values. While this worked, the forged DataSN values did not match the ExpDataSN value in the subsequent SCSI Response PDU. The initiator does not currently verify this value, but the forged DataSN values prevent adding a check. To avoid this, allow a logical iSCSI PDU (struct icl_pdu) to describe a burst of PDUs via a new 'ip_additional_pdus' field. Normally this field is set to zero when 'struct icl_pdu' represents a single PDU. If logical PDU represents a burst of on-the-wire PDUs, then 'ip_npdus' contains the count of additional on-the-wire PDUs. The header of this "large" PDU is still modified, but the DataSN field now contains the DataSN value of the first on-the-wire PDU in the burst. Reviewed by: mav Sponsored by: Chelsio Communications Differential Revision: https://reviews.freebsd.org/D31577
168 lines
4.7 KiB
C
168 lines
4.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2012 The FreeBSD Foundation
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*
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* This software was developed by Edward Tomasz Napierala under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef ICL_H
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#define ICL_H
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/*
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* iSCSI Common Layer. It's used by both the initiator and target to send
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* and receive iSCSI PDUs.
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*/
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#include <sys/types.h>
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#include <sys/kobj.h>
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#include <sys/condvar.h>
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#include <sys/sysctl.h>
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SYSCTL_DECL(_kern_icl);
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extern int icl_debug;
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#define ICL_DEBUG(X, ...) \
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do { \
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if (icl_debug > 1) \
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printf("%s: " X "\n", __func__, ## __VA_ARGS__);\
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} while (0)
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#define ICL_WARN(X, ...) \
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do { \
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if (icl_debug > 0) { \
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printf("WARNING: %s: " X "\n", \
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__func__, ## __VA_ARGS__); \
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} \
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} while (0)
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struct icl_conn;
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struct ccb_scsiio;
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union ctl_io;
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struct icl_pdu {
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STAILQ_ENTRY(icl_pdu) ip_next;
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struct icl_conn *ip_conn;
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struct iscsi_bhs *ip_bhs;
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struct mbuf *ip_bhs_mbuf;
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size_t ip_ahs_len;
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struct mbuf *ip_ahs_mbuf;
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size_t ip_data_len;
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struct mbuf *ip_data_mbuf;
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/*
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* When a "large" received PDU represents multiple on-the-wire
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* PDUs, this is the count of additional on-the-wire PDUs.
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* For PDUs that match on-the-wire PDUs, this should be set to
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* zero.
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*/
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u_int ip_additional_pdus;
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/*
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* User (initiator or provider) private fields.
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*/
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void *ip_prv0;
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void *ip_prv1;
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};
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#define ICL_NOCOPY (1 << 30)
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struct icl_conn {
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KOBJ_FIELDS;
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struct mtx *ic_lock;
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struct socket *ic_socket;
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#ifdef DIAGNOSTIC
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volatile u_int ic_outstanding_pdus;
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#endif
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uint32_t ic_max_recv_data_segment_length;
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uint32_t ic_max_send_data_segment_length;
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size_t ic_hw_isomax;
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size_t ic_maxtags;
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bool ic_header_crc32c;
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bool ic_data_crc32c;
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bool ic_disconnecting;
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bool ic_iser;
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bool ic_unmapped;
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const char *ic_name;
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const char *ic_offload;
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void (*ic_receive)(struct icl_pdu *);
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void (*ic_error)(struct icl_conn *);
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/*
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* User (initiator or provider) private fields.
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*/
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void *ic_prv0;
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};
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struct icl_drv_limits {
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int idl_max_recv_data_segment_length;
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int idl_max_send_data_segment_length;
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int idl_max_burst_length;
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int idl_first_burst_length;
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int spare[4];
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};
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typedef void (*icl_pdu_cb)(struct icl_pdu *, int error);
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struct icl_conn *icl_new_conn(const char *offload, bool iser, const char *name,
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struct mtx *lock);
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int icl_limits(const char *offload, bool iser,
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struct icl_drv_limits *idl);
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int icl_register(const char *offload, bool iser, int priority,
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int (*limits)(struct icl_drv_limits *),
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struct icl_conn *(*new_conn)(const char *, struct mtx *));
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int icl_unregister(const char *offload, bool rdma);
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#ifdef ICL_KERNEL_PROXY
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struct sockaddr;
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struct icl_listen;
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/*
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* Target part.
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*/
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struct icl_listen *icl_listen_new(void (*accept_cb)(struct socket *,
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struct sockaddr *, int));
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void icl_listen_free(struct icl_listen *il);
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int icl_listen_add(struct icl_listen *il, bool rdma,
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int domain, int socktype, int protocol,
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struct sockaddr *sa, int portal_id);
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int icl_listen_remove(struct icl_listen *il, struct sockaddr *sa);
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/*
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* Those two are not a public API; only to be used between icl_soft.c
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* and icl_soft_proxy.c.
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*/
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int icl_soft_handoff_sock(struct icl_conn *ic, struct socket *so);
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int icl_soft_proxy_connect(struct icl_conn *ic, int domain,
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int socktype, int protocol, struct sockaddr *from_sa,
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struct sockaddr *to_sa);
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#endif /* ICL_KERNEL_PROXY */
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#endif /* !ICL_H */
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