595 lines
16 KiB
C
595 lines
16 KiB
C
/*-
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* Copyright (c) 2015, Mellanox Technologies, Inc. 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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#include "icl_iser.h"
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SYSCTL_NODE(_kern, OID_AUTO, iser, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"iSER module");
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int iser_debug = 0;
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SYSCTL_INT(_kern_iser, OID_AUTO, debug, CTLFLAG_RWTUN,
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&iser_debug, 0, "Enable iser debug messages");
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static MALLOC_DEFINE(M_ICL_ISER, "icl_iser", "iSCSI iser backend");
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static uma_zone_t icl_pdu_zone;
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static volatile u_int icl_iser_ncons;
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struct iser_global ig;
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static void iser_conn_release(struct icl_conn *ic);
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static icl_conn_new_pdu_t iser_conn_new_pdu;
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static icl_conn_pdu_free_t iser_conn_pdu_free;
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static icl_conn_pdu_data_segment_length_t iser_conn_pdu_data_segment_length;
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static icl_conn_pdu_append_bio_t iser_conn_pdu_append_bio;
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static icl_conn_pdu_append_data_t iser_conn_pdu_append_data;
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static icl_conn_pdu_queue_t iser_conn_pdu_queue;
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static icl_conn_handoff_t iser_conn_handoff;
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static icl_conn_free_t iser_conn_free;
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static icl_conn_close_t iser_conn_close;
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static icl_conn_connect_t iser_conn_connect;
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static icl_conn_task_setup_t iser_conn_task_setup;
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static icl_conn_task_done_t iser_conn_task_done;
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static icl_conn_pdu_get_bio_t iser_conn_pdu_get_bio;
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static icl_conn_pdu_get_data_t iser_conn_pdu_get_data;
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static kobj_method_t icl_iser_methods[] = {
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KOBJMETHOD(icl_conn_new_pdu, iser_conn_new_pdu),
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KOBJMETHOD(icl_conn_pdu_free, iser_conn_pdu_free),
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KOBJMETHOD(icl_conn_pdu_data_segment_length, iser_conn_pdu_data_segment_length),
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KOBJMETHOD(icl_conn_pdu_append_bio, iser_conn_pdu_append_bio),
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KOBJMETHOD(icl_conn_pdu_append_data, iser_conn_pdu_append_data),
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KOBJMETHOD(icl_conn_pdu_queue, iser_conn_pdu_queue),
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KOBJMETHOD(icl_conn_handoff, iser_conn_handoff),
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KOBJMETHOD(icl_conn_free, iser_conn_free),
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KOBJMETHOD(icl_conn_close, iser_conn_close),
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KOBJMETHOD(icl_conn_connect, iser_conn_connect),
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KOBJMETHOD(icl_conn_task_setup, iser_conn_task_setup),
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KOBJMETHOD(icl_conn_task_done, iser_conn_task_done),
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KOBJMETHOD(icl_conn_pdu_get_bio, iser_conn_pdu_get_bio),
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KOBJMETHOD(icl_conn_pdu_get_data, iser_conn_pdu_get_data),
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{ 0, 0 }
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};
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DEFINE_CLASS(icl_iser, icl_iser_methods, sizeof(struct iser_conn));
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/**
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* iser_initialize_headers() - Initialize task headers
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* @pdu: iser pdu
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* @iser_conn: iser connection
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*
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* Notes:
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* This routine may race with iser teardown flow for scsi
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* error handling TMFs. So for TMF we should acquire the
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* state mutex to avoid dereferencing the IB device which
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* may have already been terminated (racing teardown sequence).
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*/
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int
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iser_initialize_headers(struct icl_iser_pdu *pdu, struct iser_conn *iser_conn)
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{
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struct iser_tx_desc *tx_desc = &pdu->desc;
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struct iser_device *device = iser_conn->ib_conn.device;
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u64 dma_addr;
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int ret = 0;
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dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
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ISER_HEADERS_LEN, DMA_TO_DEVICE);
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if (ib_dma_mapping_error(device->ib_device, dma_addr)) {
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ret = -ENOMEM;
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goto out;
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}
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tx_desc->mapped = true;
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tx_desc->dma_addr = dma_addr;
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tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
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tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
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tx_desc->tx_sg[0].lkey = device->mr->lkey;
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out:
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return (ret);
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}
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int
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iser_conn_pdu_append_bio(struct icl_conn *ic, struct icl_pdu *request,
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struct bio *bp, size_t offset, size_t len, int flags)
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{
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MPASS(!((request->ip_bhs->bhs_opcode & ISCSI_OPCODE_MASK) ==
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ISCSI_BHS_OPCODE_LOGIN_REQUEST ||
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(request->ip_bhs->bhs_opcode & ISCSI_OPCODE_MASK) ==
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ISCSI_BHS_OPCODE_TEXT_REQUEST));
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return (0);
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}
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int
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iser_conn_pdu_append_data(struct icl_conn *ic, struct icl_pdu *request,
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const void *addr, size_t len, int flags)
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{
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struct iser_conn *iser_conn = icl_to_iser_conn(ic);
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switch (request->ip_bhs->bhs_opcode & ISCSI_OPCODE_MASK) {
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case ISCSI_BHS_OPCODE_LOGIN_REQUEST:
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case ISCSI_BHS_OPCODE_TEXT_REQUEST:
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ISER_DBG("copy to login buff");
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memcpy(iser_conn->login_req_buf, addr, len);
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request->ip_data_len = len;
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break;
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}
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return (0);
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}
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void
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iser_conn_pdu_get_bio(struct icl_conn *ic, struct icl_pdu *ip,
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size_t pdu_off, struct bio *bp, size_t bio_off,
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size_t len)
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{
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MPASS(ip->ip_data_mbuf == NULL);
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}
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void
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iser_conn_pdu_get_data(struct icl_conn *ic, struct icl_pdu *ip,
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size_t off, void *addr, size_t len)
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{
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/* If we have a receive data, copy it to upper layer buffer */
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if (ip->ip_data_mbuf)
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memcpy(addr, ip->ip_data_mbuf + off, len);
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}
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/*
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* Allocate icl_pdu with empty BHS to fill up by the caller.
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*/
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struct icl_pdu *
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iser_new_pdu(struct icl_conn *ic, int flags)
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{
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struct icl_iser_pdu *iser_pdu;
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struct icl_pdu *ip;
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struct iser_conn *iser_conn = icl_to_iser_conn(ic);
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iser_pdu = uma_zalloc(icl_pdu_zone, flags | M_ZERO);
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if (iser_pdu == NULL) {
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ISER_WARN("failed to allocate %zd bytes", sizeof(*iser_pdu));
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return (NULL);
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}
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iser_pdu->iser_conn = iser_conn;
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ip = &iser_pdu->icl_pdu;
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ip->ip_conn = ic;
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ip->ip_bhs = &iser_pdu->desc.iscsi_header;
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return (ip);
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}
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struct icl_pdu *
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iser_conn_new_pdu(struct icl_conn *ic, int flags)
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{
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return (iser_new_pdu(ic, flags));
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}
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void
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iser_pdu_free(struct icl_conn *ic, struct icl_pdu *ip)
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{
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struct icl_iser_pdu *iser_pdu = icl_to_iser_pdu(ip);
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uma_zfree(icl_pdu_zone, iser_pdu);
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}
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size_t
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iser_conn_pdu_data_segment_length(struct icl_conn *ic,
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const struct icl_pdu *request)
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{
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uint32_t len = 0;
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len += request->ip_bhs->bhs_data_segment_len[0];
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len <<= 8;
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len += request->ip_bhs->bhs_data_segment_len[1];
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len <<= 8;
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len += request->ip_bhs->bhs_data_segment_len[2];
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return (len);
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}
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void
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iser_conn_pdu_free(struct icl_conn *ic, struct icl_pdu *ip)
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{
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iser_pdu_free(ic, ip);
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}
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static bool
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is_control_opcode(uint8_t opcode)
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{
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bool is_control = false;
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switch (opcode & ISCSI_OPCODE_MASK) {
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case ISCSI_BHS_OPCODE_NOP_OUT:
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case ISCSI_BHS_OPCODE_LOGIN_REQUEST:
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case ISCSI_BHS_OPCODE_LOGOUT_REQUEST:
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case ISCSI_BHS_OPCODE_TEXT_REQUEST:
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is_control = true;
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break;
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case ISCSI_BHS_OPCODE_SCSI_COMMAND:
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is_control = false;
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break;
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default:
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ISER_ERR("unknown opcode %d", opcode);
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}
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return (is_control);
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}
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void
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iser_conn_pdu_queue(struct icl_conn *ic, struct icl_pdu *ip)
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{
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struct iser_conn *iser_conn = icl_to_iser_conn(ic);
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struct icl_iser_pdu *iser_pdu = icl_to_iser_pdu(ip);
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int ret;
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if (iser_conn->state != ISER_CONN_UP)
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return;
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ret = iser_initialize_headers(iser_pdu, iser_conn);
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if (ret) {
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ISER_ERR("Failed to map TX descriptor pdu %p", iser_pdu);
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return;
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}
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if (is_control_opcode(ip->ip_bhs->bhs_opcode)) {
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ret = iser_send_control(iser_conn, iser_pdu);
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if (unlikely(ret))
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ISER_ERR("Failed to send control pdu %p", iser_pdu);
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} else {
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ret = iser_send_command(iser_conn, iser_pdu);
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if (unlikely(ret))
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ISER_ERR("Failed to send command pdu %p", iser_pdu);
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}
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}
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static struct icl_conn *
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iser_new_conn(const char *name, struct mtx *lock)
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{
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struct iser_conn *iser_conn;
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struct icl_conn *ic;
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refcount_acquire(&icl_iser_ncons);
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iser_conn = (struct iser_conn *)kobj_create(&icl_iser_class, M_ICL_ISER, M_WAITOK | M_ZERO);
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if (!iser_conn) {
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ISER_ERR("failed to allocate iser conn");
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refcount_release(&icl_iser_ncons);
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return (NULL);
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}
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cv_init(&iser_conn->up_cv, "iser_cv");
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sx_init(&iser_conn->state_mutex, "iser_conn_state_mutex");
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mtx_init(&iser_conn->ib_conn.beacon.flush_lock, "iser_flush_lock", NULL, MTX_DEF);
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cv_init(&iser_conn->ib_conn.beacon.flush_cv, "flush_cv");
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mtx_init(&iser_conn->ib_conn.lock, "iser_lock", NULL, MTX_DEF);
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ic = &iser_conn->icl_conn;
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ic->ic_lock = lock;
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ic->ic_name = name;
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ic->ic_offload = strdup("iser", M_TEMP);
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ic->ic_iser = true;
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ic->ic_unmapped = true;
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return (ic);
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}
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void
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iser_conn_free(struct icl_conn *ic)
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{
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struct iser_conn *iser_conn = icl_to_iser_conn(ic);
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iser_conn_release(ic);
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mtx_destroy(&iser_conn->ib_conn.lock);
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cv_destroy(&iser_conn->ib_conn.beacon.flush_cv);
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mtx_destroy(&iser_conn->ib_conn.beacon.flush_lock);
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sx_destroy(&iser_conn->state_mutex);
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cv_destroy(&iser_conn->up_cv);
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kobj_delete((struct kobj *)iser_conn, M_ICL_ISER);
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refcount_release(&icl_iser_ncons);
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}
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int
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iser_conn_handoff(struct icl_conn *ic, int fd)
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{
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struct iser_conn *iser_conn = icl_to_iser_conn(ic);
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int error = 0;
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sx_xlock(&iser_conn->state_mutex);
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if (iser_conn->state != ISER_CONN_UP) {
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error = EINVAL;
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ISER_ERR("iser_conn %p state is %d, teardown started\n",
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iser_conn, iser_conn->state);
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goto out;
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}
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error = iser_alloc_rx_descriptors(iser_conn, ic->ic_maxtags);
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if (error)
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goto out;
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error = iser_post_recvm(iser_conn, iser_conn->min_posted_rx);
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if (error)
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goto post_error;
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iser_conn->handoff_done = true;
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sx_xunlock(&iser_conn->state_mutex);
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return (error);
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post_error:
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iser_free_rx_descriptors(iser_conn);
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out:
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sx_xunlock(&iser_conn->state_mutex);
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return (error);
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}
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/**
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* Frees all conn objects
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*/
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static void
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iser_conn_release(struct icl_conn *ic)
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{
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struct iser_conn *iser_conn = icl_to_iser_conn(ic);
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struct ib_conn *ib_conn = &iser_conn->ib_conn;
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struct iser_conn *curr, *tmp;
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mtx_lock(&ig.connlist_mutex);
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/*
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* Search for iser connection in global list.
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* It may not be there in case of failure in connection establishment
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* stage.
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*/
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list_for_each_entry_safe(curr, tmp, &ig.connlist, conn_list) {
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if (iser_conn == curr) {
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ISER_WARN("found iser_conn %p", iser_conn);
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list_del(&iser_conn->conn_list);
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}
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}
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mtx_unlock(&ig.connlist_mutex);
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/*
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* In case we reconnecting or removing session, we need to
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* release IB resources (which is safe to call more than once).
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*/
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sx_xlock(&iser_conn->state_mutex);
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iser_free_ib_conn_res(iser_conn, true);
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sx_xunlock(&iser_conn->state_mutex);
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if (ib_conn->cma_id != NULL) {
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rdma_destroy_id(ib_conn->cma_id);
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ib_conn->cma_id = NULL;
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}
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}
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void
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iser_conn_close(struct icl_conn *ic)
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{
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struct iser_conn *iser_conn = icl_to_iser_conn(ic);
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ISER_INFO("closing conn %p", iser_conn);
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sx_xlock(&iser_conn->state_mutex);
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/*
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* In case iser connection is waiting on conditional variable
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* (state PENDING) and we try to close it before connection establishment,
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* we need to signal it to continue releasing connection properly.
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*/
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if (!iser_conn_terminate(iser_conn) && iser_conn->state == ISER_CONN_PENDING)
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cv_signal(&iser_conn->up_cv);
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sx_xunlock(&iser_conn->state_mutex);
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}
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int
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iser_conn_connect(struct icl_conn *ic, int domain, int socktype,
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int protocol, struct sockaddr *from_sa, struct sockaddr *to_sa)
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{
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struct iser_conn *iser_conn = icl_to_iser_conn(ic);
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struct ib_conn *ib_conn = &iser_conn->ib_conn;
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int err = 0;
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iser_conn_release(ic);
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sx_xlock(&iser_conn->state_mutex);
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/* the device is known only --after-- address resolution */
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ib_conn->device = NULL;
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iser_conn->handoff_done = false;
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iser_conn->state = ISER_CONN_PENDING;
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ib_conn->cma_id = rdma_create_id(&init_net, iser_cma_handler, (void *)iser_conn,
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RDMA_PS_TCP, IB_QPT_RC);
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if (IS_ERR(ib_conn->cma_id)) {
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err = -PTR_ERR(ib_conn->cma_id);
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ISER_ERR("rdma_create_id failed: %d", err);
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goto id_failure;
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}
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err = rdma_resolve_addr(ib_conn->cma_id, from_sa, to_sa, 1000);
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if (err) {
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ISER_ERR("rdma_resolve_addr failed: %d", err);
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if (err < 0)
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err = -err;
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goto addr_failure;
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}
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ISER_DBG("before cv_wait: %p", iser_conn);
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cv_wait(&iser_conn->up_cv, &iser_conn->state_mutex);
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ISER_DBG("after cv_wait: %p", iser_conn);
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if (iser_conn->state != ISER_CONN_UP) {
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err = EIO;
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goto addr_failure;
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}
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err = iser_alloc_login_buf(iser_conn);
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if (err)
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goto addr_failure;
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sx_xunlock(&iser_conn->state_mutex);
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mtx_lock(&ig.connlist_mutex);
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list_add(&iser_conn->conn_list, &ig.connlist);
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mtx_unlock(&ig.connlist_mutex);
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return (0);
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id_failure:
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ib_conn->cma_id = NULL;
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addr_failure:
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sx_xunlock(&iser_conn->state_mutex);
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return (err);
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}
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int
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iser_conn_task_setup(struct icl_conn *ic, struct icl_pdu *ip,
|
|
struct ccb_scsiio *csio,
|
|
uint32_t *task_tagp, void **prvp)
|
|
{
|
|
struct icl_iser_pdu *iser_pdu = icl_to_iser_pdu(ip);
|
|
|
|
*prvp = ip;
|
|
iser_pdu->csio = csio;
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
iser_conn_task_done(struct icl_conn *ic, void *prv)
|
|
{
|
|
struct icl_pdu *ip = prv;
|
|
struct icl_iser_pdu *iser_pdu = icl_to_iser_pdu(ip);
|
|
struct iser_device *device = iser_pdu->iser_conn->ib_conn.device;
|
|
struct iser_tx_desc *tx_desc = &iser_pdu->desc;
|
|
|
|
if (iser_pdu->dir[ISER_DIR_IN]) {
|
|
iser_unreg_rdma_mem(iser_pdu, ISER_DIR_IN);
|
|
iser_dma_unmap_task_data(iser_pdu,
|
|
&iser_pdu->data[ISER_DIR_IN],
|
|
DMA_FROM_DEVICE);
|
|
}
|
|
|
|
if (iser_pdu->dir[ISER_DIR_OUT]) {
|
|
iser_unreg_rdma_mem(iser_pdu, ISER_DIR_OUT);
|
|
iser_dma_unmap_task_data(iser_pdu,
|
|
&iser_pdu->data[ISER_DIR_OUT],
|
|
DMA_TO_DEVICE);
|
|
}
|
|
|
|
if (likely(tx_desc->mapped)) {
|
|
ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
|
|
ISER_HEADERS_LEN, DMA_TO_DEVICE);
|
|
tx_desc->mapped = false;
|
|
}
|
|
|
|
iser_pdu_free(ic, ip);
|
|
}
|
|
|
|
static int
|
|
iser_limits(struct icl_drv_limits *idl, int socket)
|
|
{
|
|
|
|
idl->idl_max_recv_data_segment_length = 128 * 1024;
|
|
idl->idl_max_send_data_segment_length = 128 * 1024;
|
|
idl->idl_max_burst_length = 262144;
|
|
idl->idl_first_burst_length = 65536;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
icl_iser_load(void)
|
|
{
|
|
int error;
|
|
|
|
ISER_DBG("Starting iSER datamover...");
|
|
|
|
icl_pdu_zone = uma_zcreate("icl_iser_pdu", sizeof(struct icl_iser_pdu),
|
|
NULL, NULL, NULL, NULL,
|
|
UMA_ALIGN_PTR, 0);
|
|
/* FIXME: Check rc */
|
|
|
|
refcount_init(&icl_iser_ncons, 0);
|
|
|
|
error = icl_register("iser", true, 0, iser_limits, iser_new_conn);
|
|
KASSERT(error == 0, ("failed to register iser"));
|
|
|
|
memset(&ig, 0, sizeof(struct iser_global));
|
|
|
|
/* device init is called only after the first addr resolution */
|
|
sx_init(&ig.device_list_mutex, "global_device_lock");
|
|
INIT_LIST_HEAD(&ig.device_list);
|
|
mtx_init(&ig.connlist_mutex, "iser_global_conn_lock", NULL, MTX_DEF);
|
|
INIT_LIST_HEAD(&ig.connlist);
|
|
sx_init(&ig.close_conns_mutex, "global_close_conns_lock");
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
icl_iser_unload(void)
|
|
{
|
|
ISER_DBG("Removing iSER datamover...");
|
|
|
|
if (icl_iser_ncons != 0)
|
|
return (EBUSY);
|
|
|
|
sx_destroy(&ig.close_conns_mutex);
|
|
mtx_destroy(&ig.connlist_mutex);
|
|
sx_destroy(&ig.device_list_mutex);
|
|
|
|
icl_unregister("iser", true);
|
|
|
|
uma_zdestroy(icl_pdu_zone);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
icl_iser_modevent(module_t mod, int what, void *arg)
|
|
{
|
|
switch (what) {
|
|
case MOD_LOAD:
|
|
return (icl_iser_load());
|
|
case MOD_UNLOAD:
|
|
return (icl_iser_unload());
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
|
|
moduledata_t icl_iser_data = {
|
|
.name = "icl_iser",
|
|
.evhand = icl_iser_modevent,
|
|
.priv = 0
|
|
};
|
|
|
|
DECLARE_MODULE(icl_iser, icl_iser_data, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
|
|
MODULE_DEPEND(icl_iser, icl, 1, 1, 1);
|
|
MODULE_DEPEND(icl_iser, ibcore, 1, 1, 1);
|
|
MODULE_VERSION(icl_iser, 1);
|