e3148e46b2
cards supported by cxgbe(4). On the host side this driver interfaces with the storage stack via the ICL (iSCSI Common Layer) in the kernel. On the wire the traffic is standard iSCSI (SCSI over TCP as per RFC 3720/7143 etc.) that interoperates with all other standards compliant implementations. The driver is layered on top of the TOE driver (t4_tom) and promotes connections being handled by t4_tom to iSCSI ULP (Upper Layer Protocol) mode. Hardware assistance in this mode includes: - Full TCP processing. - iSCSI PDU identification and recovery within the TCP stream. - Header and/or data digest insertion (tx) and verification (rx). - Zero copy (both tx and rx). Man page will follow in a separate commit in a couple of weeks. Relnotes: Yes Sponsored by: Chelsio Communications
168 lines
4.7 KiB
C
168 lines
4.7 KiB
C
/*-
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* Copyright (c) 2012, 2015 Chelsio Communications, Inc.
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* All rights reserved.
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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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*/
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#ifndef __CXGBEI_OFLD_H__
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#define __CXGBEI_OFLD_H__
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#include <dev/iscsi/icl.h>
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enum {
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CWT_SLEEPING = 1,
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CWT_RUNNING = 2,
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CWT_STOP = 3,
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CWT_STOPPED = 4,
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};
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struct cxgbei_worker_thread_softc {
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struct mtx cwt_lock;
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struct cv cwt_cv;
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volatile int cwt_state;
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TAILQ_HEAD(, icl_cxgbei_conn) rx_head;
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} __aligned(CACHE_LINE_SIZE);
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#define CXGBEI_CONN_SIGNATURE 0x56788765
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enum {
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RXF_ACTIVE = 1 << 0, /* In the worker thread's queue */
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};
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struct icl_cxgbei_conn {
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struct icl_conn ic;
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/* cxgbei specific stuff goes here. */
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uint32_t icc_signature;
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int ulp_submode;
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struct adapter *sc;
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struct toepcb *toep;
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/* Receive related. */
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u_int rx_flags; /* protected by so_rcv lock */
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u_int cwt;
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STAILQ_HEAD(, icl_pdu) rcvd_pdus; /* protected by so_rcv lock */
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TAILQ_ENTRY(icl_cxgbei_conn) rx_link; /* protected by cwt lock */
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};
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static inline struct icl_cxgbei_conn *
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ic_to_icc(struct icl_conn *ic)
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{
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return (__containerof(ic, struct icl_cxgbei_conn, ic));
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}
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#define CXGBEI_PDU_SIGNATURE 0x12344321
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struct icl_cxgbei_pdu {
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struct icl_pdu ip;
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/* cxgbei specific stuff goes here. */
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uint32_t icp_signature;
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uint32_t pdu_seq; /* For debug only */
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u_int pdu_flags;
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};
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static inline struct icl_cxgbei_pdu *
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ip_to_icp(struct icl_pdu *ip)
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{
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return (__containerof(ip, struct icl_cxgbei_pdu, ip));
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}
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struct cxgbei_sgl {
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int sg_flag;
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void *sg_addr;
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void *sg_dma_addr;
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size_t sg_offset;
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size_t sg_length;
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};
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#define cxgbei_scsi_for_each_sg(_sgl, _sgel, _n, _i) \
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for (_i = 0, _sgel = (cxgbei_sgl*) (_sgl); _i < _n; _i++, \
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_sgel++)
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#define sg_dma_addr(_sgel) _sgel->sg_dma_addr
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#define sg_virt(_sgel) _sgel->sg_addr
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#define sg_len(_sgel) _sgel->sg_length
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#define sg_off(_sgel) _sgel->sg_offset
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#define sg_next(_sgel) _sgel + 1
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#define SBUF_ULP_FLAG_HDR_RCVD 0x1
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#define SBUF_ULP_FLAG_DATA_RCVD 0x2
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#define SBUF_ULP_FLAG_STATUS_RCVD 0x4
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#define SBUF_ULP_FLAG_HCRC_ERROR 0x10
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#define SBUF_ULP_FLAG_DCRC_ERROR 0x20
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#define SBUF_ULP_FLAG_PAD_ERROR 0x40
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#define SBUF_ULP_FLAG_DATA_DDPED 0x80
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/* private data for each scsi task */
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struct cxgbei_task_data {
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struct cxgbei_sgl sgl[256];
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u_int nsge;
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u_int sc_ddp_tag;
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};
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struct cxgbei_ulp2_tag_format {
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u_char sw_bits;
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u_char rsvd_bits;
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u_char rsvd_shift;
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u_char filler[1];
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uint32_t rsvd_mask;
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};
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struct cxgbei_data {
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u_int max_txsz;
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u_int max_rxsz;
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u_int llimit;
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u_int ulimit;
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u_int nppods;
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u_int idx_last;
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u_char idx_bits;
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uint32_t idx_mask;
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uint32_t rsvd_tag_mask;
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struct mtx map_lock;
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bus_dma_tag_t ulp_ddp_tag;
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unsigned char *colors;
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struct cxgbei_ulp2_gather_list **gl_map;
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struct cxgbei_ulp2_tag_format tag_format;
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};
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void cxgbei_conn_task_reserve_itt(void *, void **, void *, unsigned int *);
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void cxgbei_conn_transfer_reserve_ttt(void *, void **, void *, unsigned int *);
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void cxgbei_cleanup_task(void *, void *);
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u_int cxgbei_select_worker_thread(struct icl_cxgbei_conn *);
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struct cxgbei_ulp2_pagepod_hdr;
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int t4_ddp_set_map(struct cxgbei_data *, void *,
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struct cxgbei_ulp2_pagepod_hdr *, u_int, u_int,
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struct cxgbei_ulp2_gather_list *, int);
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void t4_ddp_clear_map(struct cxgbei_data *, struct cxgbei_ulp2_gather_list *,
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u_int, u_int, u_int, struct icl_cxgbei_conn *);
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#endif
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