freebsd-nq/sys/dev/cxgbe/cxgbei/cxgbei.h
John Baldwin c261b6ea4e iscsi: Teach the iSCSI stack about "large" received PDUs.
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
2021-08-18 10:56:28 -07:00

150 lines
4.0 KiB
C

/*-
* Copyright (c) 2012, 2015 Chelsio Communications, Inc.
* All rights reserved.
*
* 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.
*
* $FreeBSD$
*
*/
#ifndef __CXGBEI_OFLD_H__
#define __CXGBEI_OFLD_H__
#include <dev/iscsi/icl.h>
enum {
CWT_SLEEPING = 1,
CWT_RUNNING = 2,
CWT_STOP = 3,
CWT_STOPPED = 4,
};
struct cxgbei_worker_thread_softc {
struct mtx cwt_lock;
struct cv cwt_cv;
volatile int cwt_state;
TAILQ_HEAD(, icl_cxgbei_conn) rx_head;
} __aligned(CACHE_LINE_SIZE);
#define CXGBEI_CONN_SIGNATURE 0x56788765
enum {
RXF_ACTIVE = 1 << 0, /* In the worker thread's queue */
};
struct cxgbei_cmp {
LIST_ENTRY(cxgbei_cmp) link;
uint32_t tt; /* Transfer tag. */
uint32_t next_buffer_offset;
uint32_t last_datasn;
};
LIST_HEAD(cxgbei_cmp_head, cxgbei_cmp);
struct icl_cxgbei_conn {
struct icl_conn ic;
/* cxgbei specific stuff goes here. */
uint32_t icc_signature;
int ulp_submode;
struct adapter *sc;
struct toepcb *toep;
/* Receive related. */
u_int rx_flags; /* protected by so_rcv lock */
u_int cwt;
STAILQ_HEAD(, icl_pdu) rcvd_pdus; /* protected by so_rcv lock */
TAILQ_ENTRY(icl_cxgbei_conn) rx_link; /* protected by cwt lock */
struct cxgbei_cmp_head *cmp_table; /* protected by cmp_lock */
struct mtx cmp_lock;
unsigned long cmp_hash_mask;
};
static inline struct icl_cxgbei_conn *
ic_to_icc(struct icl_conn *ic)
{
return (__containerof(ic, struct icl_cxgbei_conn, ic));
}
/* PDU flags and signature. */
enum {
ICPF_RX_HDR = 1 << 0, /* PDU header received. */
ICPF_RX_FLBUF = 1 << 1, /* PDU payload received in a freelist. */
ICPF_RX_DDP = 1 << 2, /* PDU payload DDP'd. */
ICPF_RX_STATUS = 1 << 3, /* Rx status received. */
ICPF_HCRC_ERR = 1 << 4, /* Header digest error. */
ICPF_DCRC_ERR = 1 << 5, /* Data digest error. */
ICPF_PAD_ERR = 1 << 6, /* Padding error. */
CXGBEI_PDU_SIGNATURE = 0x12344321
};
struct icl_cxgbei_pdu {
struct icl_pdu ip;
/* cxgbei specific stuff goes here. */
uint32_t icp_signature;
uint32_t icp_seq; /* For debug only */
u_int icp_flags;
u_int ref_cnt;
icl_pdu_cb cb;
int error;
};
static inline struct icl_cxgbei_pdu *
ip_to_icp(struct icl_pdu *ip)
{
return (__containerof(ip, struct icl_cxgbei_pdu, ip));
}
struct cxgbei_data {
u_int max_tx_data_len;
u_int max_rx_data_len;
u_int ddp_threshold;
struct ppod_region pr;
struct sysctl_ctx_list ctx; /* from uld_activate to deactivate */
};
#define CXGBEI_MAX_ISO_PAYLOAD 65535
/* cxgbei.c */
u_int cxgbei_select_worker_thread(struct icl_cxgbei_conn *);
/* icl_cxgbei.c */
int icl_cxgbei_mod_load(void);
int icl_cxgbei_mod_unload(void);
struct icl_pdu *icl_cxgbei_new_pdu(int);
void icl_cxgbei_new_pdu_set_conn(struct icl_pdu *, struct icl_conn *);
void icl_cxgbei_conn_pdu_free(struct icl_conn *, struct icl_pdu *);
struct cxgbei_cmp *cxgbei_find_cmp(struct icl_cxgbei_conn *, uint32_t);
#endif