forked from Minki/linux
fce50a2fa4
This patch fixes a NULL pointer dereference in isert_login_recv_done()
of isert_conn->cm_id due to isert_cma_handler() -> isert_connect_error()
resetting isert_conn->cm_id = NULL during a failed login attempt.
As per Sagi, we will always see the completion of all recv wrs posted
on the qp (given that we assigned a ->done handler), this is a FLUSH
error completion, we just don't get to verify that because we deref
NULL before.
The issue here, was the assumption that dereferencing the connection
cm_id is always safe, which is not true since:
commit 4a579da258
Author: Sagi Grimberg <sagig@mellanox.com>
Date: Sun Mar 29 15:52:04 2015 +0300
iser-target: Fix possible deadlock in RDMA_CM connection error
As I see it, we have a direct reference to the isert_device from
isert_conn which is the one-liner fix that we actually need like
we do in isert_rdma_read_done() and isert_rdma_write_done().
Reported-by: Andrea Righi <righi.andrea@gmail.com>
Tested-by: Andrea Righi <righi.andrea@gmail.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Cc: <stable@vger.kernel.org> # 3.10+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2719 lines
72 KiB
C
2719 lines
72 KiB
C
/*******************************************************************************
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* This file contains iSCSI extentions for RDMA (iSER) Verbs
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*
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* (c) Copyright 2013 Datera, Inc.
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*
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* Nicholas A. Bellinger <nab@linux-iscsi.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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****************************************************************************/
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#include <linux/string.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/rdma_cm.h>
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#include <target/target_core_base.h>
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#include <target/target_core_fabric.h>
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#include <target/iscsi/iscsi_transport.h>
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#include <linux/semaphore.h>
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#include "ib_isert.h"
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#define ISERT_MAX_CONN 8
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#define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
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#define ISER_MAX_TX_CQ_LEN \
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((ISERT_QP_MAX_REQ_DTOS + ISCSI_DEF_XMIT_CMDS_MAX) * ISERT_MAX_CONN)
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#define ISER_MAX_CQ_LEN (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \
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ISERT_MAX_CONN)
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static int isert_debug_level;
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module_param_named(debug_level, isert_debug_level, int, 0644);
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MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
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static DEFINE_MUTEX(device_list_mutex);
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static LIST_HEAD(device_list);
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static struct workqueue_struct *isert_comp_wq;
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static struct workqueue_struct *isert_release_wq;
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static int
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isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
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static int
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isert_login_post_recv(struct isert_conn *isert_conn);
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static int
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isert_rdma_accept(struct isert_conn *isert_conn);
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struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
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static void isert_release_work(struct work_struct *work);
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static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
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static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
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static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
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static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
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static inline bool
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isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
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{
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return (conn->pi_support &&
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cmd->prot_op != TARGET_PROT_NORMAL);
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}
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static void
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isert_qp_event_callback(struct ib_event *e, void *context)
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{
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struct isert_conn *isert_conn = context;
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isert_err("%s (%d): conn %p\n",
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ib_event_msg(e->event), e->event, isert_conn);
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switch (e->event) {
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case IB_EVENT_COMM_EST:
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rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
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break;
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case IB_EVENT_QP_LAST_WQE_REACHED:
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isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
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break;
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default:
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break;
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}
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}
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static struct isert_comp *
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isert_comp_get(struct isert_conn *isert_conn)
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{
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struct isert_device *device = isert_conn->device;
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struct isert_comp *comp;
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int i, min = 0;
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mutex_lock(&device_list_mutex);
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for (i = 0; i < device->comps_used; i++)
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if (device->comps[i].active_qps <
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device->comps[min].active_qps)
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min = i;
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comp = &device->comps[min];
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comp->active_qps++;
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mutex_unlock(&device_list_mutex);
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isert_info("conn %p, using comp %p min_index: %d\n",
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isert_conn, comp, min);
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return comp;
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}
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static void
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isert_comp_put(struct isert_comp *comp)
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{
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mutex_lock(&device_list_mutex);
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comp->active_qps--;
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mutex_unlock(&device_list_mutex);
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}
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static struct ib_qp *
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isert_create_qp(struct isert_conn *isert_conn,
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struct isert_comp *comp,
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struct rdma_cm_id *cma_id)
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{
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struct isert_device *device = isert_conn->device;
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struct ib_qp_init_attr attr;
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int ret;
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memset(&attr, 0, sizeof(struct ib_qp_init_attr));
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attr.event_handler = isert_qp_event_callback;
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attr.qp_context = isert_conn;
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attr.send_cq = comp->cq;
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attr.recv_cq = comp->cq;
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attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
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attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
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attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX;
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attr.cap.max_send_sge = device->ib_device->attrs.max_sge;
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attr.cap.max_recv_sge = 1;
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attr.sq_sig_type = IB_SIGNAL_REQ_WR;
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attr.qp_type = IB_QPT_RC;
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if (device->pi_capable)
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attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
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ret = rdma_create_qp(cma_id, device->pd, &attr);
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if (ret) {
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isert_err("rdma_create_qp failed for cma_id %d\n", ret);
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return ERR_PTR(ret);
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}
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return cma_id->qp;
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}
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static int
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isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
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{
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struct isert_comp *comp;
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int ret;
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comp = isert_comp_get(isert_conn);
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isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
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if (IS_ERR(isert_conn->qp)) {
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ret = PTR_ERR(isert_conn->qp);
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goto err;
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}
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return 0;
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err:
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isert_comp_put(comp);
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return ret;
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}
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static int
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isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
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{
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struct isert_device *device = isert_conn->device;
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struct ib_device *ib_dev = device->ib_device;
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struct iser_rx_desc *rx_desc;
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struct ib_sge *rx_sg;
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u64 dma_addr;
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int i, j;
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isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
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sizeof(struct iser_rx_desc), GFP_KERNEL);
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if (!isert_conn->rx_descs)
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return -ENOMEM;
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rx_desc = isert_conn->rx_descs;
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for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
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dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
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ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
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if (ib_dma_mapping_error(ib_dev, dma_addr))
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goto dma_map_fail;
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rx_desc->dma_addr = dma_addr;
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rx_sg = &rx_desc->rx_sg;
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rx_sg->addr = rx_desc->dma_addr;
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rx_sg->length = ISER_RX_PAYLOAD_SIZE;
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rx_sg->lkey = device->pd->local_dma_lkey;
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rx_desc->rx_cqe.done = isert_recv_done;
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}
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return 0;
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dma_map_fail:
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rx_desc = isert_conn->rx_descs;
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for (j = 0; j < i; j++, rx_desc++) {
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ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
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ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
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}
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kfree(isert_conn->rx_descs);
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isert_conn->rx_descs = NULL;
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isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
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return -ENOMEM;
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}
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static void
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isert_free_rx_descriptors(struct isert_conn *isert_conn)
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{
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struct ib_device *ib_dev = isert_conn->device->ib_device;
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struct iser_rx_desc *rx_desc;
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int i;
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if (!isert_conn->rx_descs)
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return;
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rx_desc = isert_conn->rx_descs;
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for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
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ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
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ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
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}
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kfree(isert_conn->rx_descs);
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isert_conn->rx_descs = NULL;
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}
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static void
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isert_free_comps(struct isert_device *device)
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{
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int i;
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for (i = 0; i < device->comps_used; i++) {
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struct isert_comp *comp = &device->comps[i];
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if (comp->cq)
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ib_free_cq(comp->cq);
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}
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kfree(device->comps);
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}
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static int
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isert_alloc_comps(struct isert_device *device)
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{
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int i, max_cqe, ret = 0;
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device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
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device->ib_device->num_comp_vectors));
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isert_info("Using %d CQs, %s supports %d vectors support "
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"pi_capable %d\n",
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device->comps_used, device->ib_device->name,
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device->ib_device->num_comp_vectors,
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device->pi_capable);
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device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
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GFP_KERNEL);
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if (!device->comps)
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return -ENOMEM;
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max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
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for (i = 0; i < device->comps_used; i++) {
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struct isert_comp *comp = &device->comps[i];
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comp->device = device;
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comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
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IB_POLL_WORKQUEUE);
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if (IS_ERR(comp->cq)) {
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isert_err("Unable to allocate cq\n");
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ret = PTR_ERR(comp->cq);
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comp->cq = NULL;
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goto out_cq;
|
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}
|
|
}
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|
|
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return 0;
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out_cq:
|
|
isert_free_comps(device);
|
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return ret;
|
|
}
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|
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static int
|
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isert_create_device_ib_res(struct isert_device *device)
|
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{
|
|
struct ib_device *ib_dev = device->ib_device;
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int ret;
|
|
|
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isert_dbg("devattr->max_sge: %d\n", ib_dev->attrs.max_sge);
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isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
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|
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ret = isert_alloc_comps(device);
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if (ret)
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goto out;
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|
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device->pd = ib_alloc_pd(ib_dev, 0);
|
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if (IS_ERR(device->pd)) {
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ret = PTR_ERR(device->pd);
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isert_err("failed to allocate pd, device %p, ret=%d\n",
|
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device, ret);
|
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goto out_cq;
|
|
}
|
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|
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/* Check signature cap */
|
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device->pi_capable = ib_dev->attrs.device_cap_flags &
|
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IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
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|
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return 0;
|
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|
|
out_cq:
|
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isert_free_comps(device);
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|
out:
|
|
if (ret > 0)
|
|
ret = -EINVAL;
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
isert_free_device_ib_res(struct isert_device *device)
|
|
{
|
|
isert_info("device %p\n", device);
|
|
|
|
ib_dealloc_pd(device->pd);
|
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isert_free_comps(device);
|
|
}
|
|
|
|
static void
|
|
isert_device_put(struct isert_device *device)
|
|
{
|
|
mutex_lock(&device_list_mutex);
|
|
device->refcount--;
|
|
isert_info("device %p refcount %d\n", device, device->refcount);
|
|
if (!device->refcount) {
|
|
isert_free_device_ib_res(device);
|
|
list_del(&device->dev_node);
|
|
kfree(device);
|
|
}
|
|
mutex_unlock(&device_list_mutex);
|
|
}
|
|
|
|
static struct isert_device *
|
|
isert_device_get(struct rdma_cm_id *cma_id)
|
|
{
|
|
struct isert_device *device;
|
|
int ret;
|
|
|
|
mutex_lock(&device_list_mutex);
|
|
list_for_each_entry(device, &device_list, dev_node) {
|
|
if (device->ib_device->node_guid == cma_id->device->node_guid) {
|
|
device->refcount++;
|
|
isert_info("Found iser device %p refcount %d\n",
|
|
device, device->refcount);
|
|
mutex_unlock(&device_list_mutex);
|
|
return device;
|
|
}
|
|
}
|
|
|
|
device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
|
|
if (!device) {
|
|
mutex_unlock(&device_list_mutex);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
INIT_LIST_HEAD(&device->dev_node);
|
|
|
|
device->ib_device = cma_id->device;
|
|
ret = isert_create_device_ib_res(device);
|
|
if (ret) {
|
|
kfree(device);
|
|
mutex_unlock(&device_list_mutex);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
device->refcount++;
|
|
list_add_tail(&device->dev_node, &device_list);
|
|
isert_info("Created a new iser device %p refcount %d\n",
|
|
device, device->refcount);
|
|
mutex_unlock(&device_list_mutex);
|
|
|
|
return device;
|
|
}
|
|
|
|
static void
|
|
isert_init_conn(struct isert_conn *isert_conn)
|
|
{
|
|
isert_conn->state = ISER_CONN_INIT;
|
|
INIT_LIST_HEAD(&isert_conn->node);
|
|
init_completion(&isert_conn->login_comp);
|
|
init_completion(&isert_conn->login_req_comp);
|
|
init_waitqueue_head(&isert_conn->rem_wait);
|
|
kref_init(&isert_conn->kref);
|
|
mutex_init(&isert_conn->mutex);
|
|
INIT_WORK(&isert_conn->release_work, isert_release_work);
|
|
}
|
|
|
|
static void
|
|
isert_free_login_buf(struct isert_conn *isert_conn)
|
|
{
|
|
struct ib_device *ib_dev = isert_conn->device->ib_device;
|
|
|
|
ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
|
|
ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
|
|
kfree(isert_conn->login_rsp_buf);
|
|
|
|
ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
|
|
ISER_RX_PAYLOAD_SIZE,
|
|
DMA_FROM_DEVICE);
|
|
kfree(isert_conn->login_req_buf);
|
|
}
|
|
|
|
static int
|
|
isert_alloc_login_buf(struct isert_conn *isert_conn,
|
|
struct ib_device *ib_dev)
|
|
{
|
|
int ret;
|
|
|
|
isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
|
|
GFP_KERNEL);
|
|
if (!isert_conn->login_req_buf)
|
|
return -ENOMEM;
|
|
|
|
isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
|
|
isert_conn->login_req_buf,
|
|
ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
|
|
ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
|
|
if (ret) {
|
|
isert_err("login_req_dma mapping error: %d\n", ret);
|
|
isert_conn->login_req_dma = 0;
|
|
goto out_free_login_req_buf;
|
|
}
|
|
|
|
isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
|
|
if (!isert_conn->login_rsp_buf) {
|
|
ret = -ENOMEM;
|
|
goto out_unmap_login_req_buf;
|
|
}
|
|
|
|
isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
|
|
isert_conn->login_rsp_buf,
|
|
ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
|
|
ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
|
|
if (ret) {
|
|
isert_err("login_rsp_dma mapping error: %d\n", ret);
|
|
isert_conn->login_rsp_dma = 0;
|
|
goto out_free_login_rsp_buf;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_free_login_rsp_buf:
|
|
kfree(isert_conn->login_rsp_buf);
|
|
out_unmap_login_req_buf:
|
|
ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
|
|
ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
|
|
out_free_login_req_buf:
|
|
kfree(isert_conn->login_req_buf);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
isert_set_nego_params(struct isert_conn *isert_conn,
|
|
struct rdma_conn_param *param)
|
|
{
|
|
struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
|
|
|
|
/* Set max inflight RDMA READ requests */
|
|
isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
|
|
attr->max_qp_init_rd_atom);
|
|
isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
|
|
|
|
if (param->private_data) {
|
|
u8 flags = *(u8 *)param->private_data;
|
|
|
|
/*
|
|
* use remote invalidation if the both initiator
|
|
* and the HCA support it
|
|
*/
|
|
isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
|
|
(attr->device_cap_flags &
|
|
IB_DEVICE_MEM_MGT_EXTENSIONS);
|
|
if (isert_conn->snd_w_inv)
|
|
isert_info("Using remote invalidation\n");
|
|
}
|
|
}
|
|
|
|
static int
|
|
isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
|
|
{
|
|
struct isert_np *isert_np = cma_id->context;
|
|
struct iscsi_np *np = isert_np->np;
|
|
struct isert_conn *isert_conn;
|
|
struct isert_device *device;
|
|
int ret = 0;
|
|
|
|
spin_lock_bh(&np->np_thread_lock);
|
|
if (!np->enabled) {
|
|
spin_unlock_bh(&np->np_thread_lock);
|
|
isert_dbg("iscsi_np is not enabled, reject connect request\n");
|
|
return rdma_reject(cma_id, NULL, 0);
|
|
}
|
|
spin_unlock_bh(&np->np_thread_lock);
|
|
|
|
isert_dbg("cma_id: %p, portal: %p\n",
|
|
cma_id, cma_id->context);
|
|
|
|
isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
|
|
if (!isert_conn)
|
|
return -ENOMEM;
|
|
|
|
isert_init_conn(isert_conn);
|
|
isert_conn->cm_id = cma_id;
|
|
|
|
ret = isert_alloc_login_buf(isert_conn, cma_id->device);
|
|
if (ret)
|
|
goto out;
|
|
|
|
device = isert_device_get(cma_id);
|
|
if (IS_ERR(device)) {
|
|
ret = PTR_ERR(device);
|
|
goto out_rsp_dma_map;
|
|
}
|
|
isert_conn->device = device;
|
|
|
|
isert_set_nego_params(isert_conn, &event->param.conn);
|
|
|
|
ret = isert_conn_setup_qp(isert_conn, cma_id);
|
|
if (ret)
|
|
goto out_conn_dev;
|
|
|
|
ret = isert_login_post_recv(isert_conn);
|
|
if (ret)
|
|
goto out_conn_dev;
|
|
|
|
ret = isert_rdma_accept(isert_conn);
|
|
if (ret)
|
|
goto out_conn_dev;
|
|
|
|
mutex_lock(&isert_np->mutex);
|
|
list_add_tail(&isert_conn->node, &isert_np->accepted);
|
|
mutex_unlock(&isert_np->mutex);
|
|
|
|
return 0;
|
|
|
|
out_conn_dev:
|
|
isert_device_put(device);
|
|
out_rsp_dma_map:
|
|
isert_free_login_buf(isert_conn);
|
|
out:
|
|
kfree(isert_conn);
|
|
rdma_reject(cma_id, NULL, 0);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
isert_connect_release(struct isert_conn *isert_conn)
|
|
{
|
|
struct isert_device *device = isert_conn->device;
|
|
|
|
isert_dbg("conn %p\n", isert_conn);
|
|
|
|
BUG_ON(!device);
|
|
|
|
isert_free_rx_descriptors(isert_conn);
|
|
if (isert_conn->cm_id &&
|
|
!isert_conn->dev_removed)
|
|
rdma_destroy_id(isert_conn->cm_id);
|
|
|
|
if (isert_conn->qp) {
|
|
struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
|
|
|
|
isert_comp_put(comp);
|
|
ib_destroy_qp(isert_conn->qp);
|
|
}
|
|
|
|
if (isert_conn->login_req_buf)
|
|
isert_free_login_buf(isert_conn);
|
|
|
|
isert_device_put(device);
|
|
|
|
if (isert_conn->dev_removed)
|
|
wake_up_interruptible(&isert_conn->rem_wait);
|
|
else
|
|
kfree(isert_conn);
|
|
}
|
|
|
|
static void
|
|
isert_connected_handler(struct rdma_cm_id *cma_id)
|
|
{
|
|
struct isert_conn *isert_conn = cma_id->qp->qp_context;
|
|
struct isert_np *isert_np = cma_id->context;
|
|
|
|
isert_info("conn %p\n", isert_conn);
|
|
|
|
mutex_lock(&isert_conn->mutex);
|
|
isert_conn->state = ISER_CONN_UP;
|
|
kref_get(&isert_conn->kref);
|
|
mutex_unlock(&isert_conn->mutex);
|
|
|
|
mutex_lock(&isert_np->mutex);
|
|
list_move_tail(&isert_conn->node, &isert_np->pending);
|
|
mutex_unlock(&isert_np->mutex);
|
|
|
|
isert_info("np %p: Allow accept_np to continue\n", isert_np);
|
|
up(&isert_np->sem);
|
|
}
|
|
|
|
static void
|
|
isert_release_kref(struct kref *kref)
|
|
{
|
|
struct isert_conn *isert_conn = container_of(kref,
|
|
struct isert_conn, kref);
|
|
|
|
isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
|
|
current->pid);
|
|
|
|
isert_connect_release(isert_conn);
|
|
}
|
|
|
|
static void
|
|
isert_put_conn(struct isert_conn *isert_conn)
|
|
{
|
|
kref_put(&isert_conn->kref, isert_release_kref);
|
|
}
|
|
|
|
static void
|
|
isert_handle_unbound_conn(struct isert_conn *isert_conn)
|
|
{
|
|
struct isert_np *isert_np = isert_conn->cm_id->context;
|
|
|
|
mutex_lock(&isert_np->mutex);
|
|
if (!list_empty(&isert_conn->node)) {
|
|
/*
|
|
* This means iscsi doesn't know this connection
|
|
* so schedule a cleanup ourselves
|
|
*/
|
|
list_del_init(&isert_conn->node);
|
|
isert_put_conn(isert_conn);
|
|
queue_work(isert_release_wq, &isert_conn->release_work);
|
|
}
|
|
mutex_unlock(&isert_np->mutex);
|
|
}
|
|
|
|
/**
|
|
* isert_conn_terminate() - Initiate connection termination
|
|
* @isert_conn: isert connection struct
|
|
*
|
|
* Notes:
|
|
* In case the connection state is BOUND, move state
|
|
* to TEMINATING and start teardown sequence (rdma_disconnect).
|
|
* In case the connection state is UP, complete flush as well.
|
|
*
|
|
* This routine must be called with mutex held. Thus it is
|
|
* safe to call multiple times.
|
|
*/
|
|
static void
|
|
isert_conn_terminate(struct isert_conn *isert_conn)
|
|
{
|
|
int err;
|
|
|
|
if (isert_conn->state >= ISER_CONN_TERMINATING)
|
|
return;
|
|
|
|
isert_info("Terminating conn %p state %d\n",
|
|
isert_conn, isert_conn->state);
|
|
isert_conn->state = ISER_CONN_TERMINATING;
|
|
err = rdma_disconnect(isert_conn->cm_id);
|
|
if (err)
|
|
isert_warn("Failed rdma_disconnect isert_conn %p\n",
|
|
isert_conn);
|
|
}
|
|
|
|
static int
|
|
isert_np_cma_handler(struct isert_np *isert_np,
|
|
enum rdma_cm_event_type event)
|
|
{
|
|
isert_dbg("%s (%d): isert np %p\n",
|
|
rdma_event_msg(event), event, isert_np);
|
|
|
|
switch (event) {
|
|
case RDMA_CM_EVENT_DEVICE_REMOVAL:
|
|
isert_np->cm_id = NULL;
|
|
break;
|
|
case RDMA_CM_EVENT_ADDR_CHANGE:
|
|
isert_np->cm_id = isert_setup_id(isert_np);
|
|
if (IS_ERR(isert_np->cm_id)) {
|
|
isert_err("isert np %p setup id failed: %ld\n",
|
|
isert_np, PTR_ERR(isert_np->cm_id));
|
|
isert_np->cm_id = NULL;
|
|
}
|
|
break;
|
|
default:
|
|
isert_err("isert np %p Unexpected event %d\n",
|
|
isert_np, event);
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
isert_disconnected_handler(struct rdma_cm_id *cma_id,
|
|
enum rdma_cm_event_type event)
|
|
{
|
|
struct isert_conn *isert_conn = cma_id->qp->qp_context;
|
|
|
|
mutex_lock(&isert_conn->mutex);
|
|
switch (isert_conn->state) {
|
|
case ISER_CONN_TERMINATING:
|
|
break;
|
|
case ISER_CONN_UP:
|
|
isert_conn_terminate(isert_conn);
|
|
ib_drain_qp(isert_conn->qp);
|
|
isert_handle_unbound_conn(isert_conn);
|
|
break;
|
|
case ISER_CONN_BOUND:
|
|
case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
|
|
iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
|
|
break;
|
|
default:
|
|
isert_warn("conn %p terminating in state %d\n",
|
|
isert_conn, isert_conn->state);
|
|
}
|
|
mutex_unlock(&isert_conn->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
isert_connect_error(struct rdma_cm_id *cma_id)
|
|
{
|
|
struct isert_conn *isert_conn = cma_id->qp->qp_context;
|
|
|
|
list_del_init(&isert_conn->node);
|
|
isert_conn->cm_id = NULL;
|
|
isert_put_conn(isert_conn);
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
|
|
{
|
|
struct isert_np *isert_np = cma_id->context;
|
|
struct isert_conn *isert_conn;
|
|
int ret = 0;
|
|
|
|
isert_info("%s (%d): status %d id %p np %p\n",
|
|
rdma_event_msg(event->event), event->event,
|
|
event->status, cma_id, cma_id->context);
|
|
|
|
if (isert_np->cm_id == cma_id)
|
|
return isert_np_cma_handler(cma_id->context, event->event);
|
|
|
|
switch (event->event) {
|
|
case RDMA_CM_EVENT_CONNECT_REQUEST:
|
|
ret = isert_connect_request(cma_id, event);
|
|
if (ret)
|
|
isert_err("failed handle connect request %d\n", ret);
|
|
break;
|
|
case RDMA_CM_EVENT_ESTABLISHED:
|
|
isert_connected_handler(cma_id);
|
|
break;
|
|
case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
|
|
case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
|
|
case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
|
|
ret = isert_disconnected_handler(cma_id, event->event);
|
|
break;
|
|
case RDMA_CM_EVENT_DEVICE_REMOVAL:
|
|
isert_conn = cma_id->qp->qp_context;
|
|
isert_conn->dev_removed = true;
|
|
isert_disconnected_handler(cma_id, event->event);
|
|
wait_event_interruptible(isert_conn->rem_wait,
|
|
isert_conn->state == ISER_CONN_DOWN);
|
|
kfree(isert_conn);
|
|
/*
|
|
* return non-zero from the callback to destroy
|
|
* the rdma cm id
|
|
*/
|
|
return 1;
|
|
case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */
|
|
isert_info("Connection rejected: %s\n",
|
|
rdma_reject_msg(cma_id, event->status));
|
|
case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
|
|
case RDMA_CM_EVENT_CONNECT_ERROR:
|
|
ret = isert_connect_error(cma_id);
|
|
break;
|
|
default:
|
|
isert_err("Unhandled RDMA CMA event: %d\n", event->event);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
isert_post_recvm(struct isert_conn *isert_conn, u32 count)
|
|
{
|
|
struct ib_recv_wr *rx_wr, *rx_wr_failed;
|
|
int i, ret;
|
|
struct iser_rx_desc *rx_desc;
|
|
|
|
for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
|
|
rx_desc = &isert_conn->rx_descs[i];
|
|
|
|
rx_wr->wr_cqe = &rx_desc->rx_cqe;
|
|
rx_wr->sg_list = &rx_desc->rx_sg;
|
|
rx_wr->num_sge = 1;
|
|
rx_wr->next = rx_wr + 1;
|
|
rx_desc->in_use = false;
|
|
}
|
|
rx_wr--;
|
|
rx_wr->next = NULL; /* mark end of work requests list */
|
|
|
|
ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
|
|
&rx_wr_failed);
|
|
if (ret)
|
|
isert_err("ib_post_recv() failed with ret: %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
|
|
{
|
|
struct ib_recv_wr *rx_wr_failed, rx_wr;
|
|
int ret;
|
|
|
|
if (!rx_desc->in_use) {
|
|
/*
|
|
* if the descriptor is not in-use we already reposted it
|
|
* for recv, so just silently return
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
rx_desc->in_use = false;
|
|
rx_wr.wr_cqe = &rx_desc->rx_cqe;
|
|
rx_wr.sg_list = &rx_desc->rx_sg;
|
|
rx_wr.num_sge = 1;
|
|
rx_wr.next = NULL;
|
|
|
|
ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
|
|
if (ret)
|
|
isert_err("ib_post_recv() failed with ret: %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
|
|
{
|
|
struct ib_device *ib_dev = isert_conn->cm_id->device;
|
|
struct ib_send_wr send_wr, *send_wr_failed;
|
|
int ret;
|
|
|
|
ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
|
|
ISER_HEADERS_LEN, DMA_TO_DEVICE);
|
|
|
|
tx_desc->tx_cqe.done = isert_login_send_done;
|
|
|
|
send_wr.next = NULL;
|
|
send_wr.wr_cqe = &tx_desc->tx_cqe;
|
|
send_wr.sg_list = tx_desc->tx_sg;
|
|
send_wr.num_sge = tx_desc->num_sge;
|
|
send_wr.opcode = IB_WR_SEND;
|
|
send_wr.send_flags = IB_SEND_SIGNALED;
|
|
|
|
ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
|
|
if (ret)
|
|
isert_err("ib_post_send() failed, ret: %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
isert_create_send_desc(struct isert_conn *isert_conn,
|
|
struct isert_cmd *isert_cmd,
|
|
struct iser_tx_desc *tx_desc)
|
|
{
|
|
struct isert_device *device = isert_conn->device;
|
|
struct ib_device *ib_dev = device->ib_device;
|
|
|
|
ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
|
|
ISER_HEADERS_LEN, DMA_TO_DEVICE);
|
|
|
|
memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
|
|
tx_desc->iser_header.flags = ISCSI_CTRL;
|
|
|
|
tx_desc->num_sge = 1;
|
|
|
|
if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
|
|
tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
|
|
isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
|
|
}
|
|
}
|
|
|
|
static int
|
|
isert_init_tx_hdrs(struct isert_conn *isert_conn,
|
|
struct iser_tx_desc *tx_desc)
|
|
{
|
|
struct isert_device *device = isert_conn->device;
|
|
struct ib_device *ib_dev = device->ib_device;
|
|
u64 dma_addr;
|
|
|
|
dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
|
|
ISER_HEADERS_LEN, DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(ib_dev, dma_addr)) {
|
|
isert_err("ib_dma_mapping_error() failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
tx_desc->dma_addr = dma_addr;
|
|
tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
|
|
tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
|
|
tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
|
|
|
|
isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
|
|
tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
|
|
tx_desc->tx_sg[0].lkey);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
|
|
struct ib_send_wr *send_wr)
|
|
{
|
|
struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
|
|
|
|
tx_desc->tx_cqe.done = isert_send_done;
|
|
send_wr->wr_cqe = &tx_desc->tx_cqe;
|
|
|
|
if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
|
|
send_wr->opcode = IB_WR_SEND_WITH_INV;
|
|
send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
|
|
} else {
|
|
send_wr->opcode = IB_WR_SEND;
|
|
}
|
|
|
|
send_wr->sg_list = &tx_desc->tx_sg[0];
|
|
send_wr->num_sge = isert_cmd->tx_desc.num_sge;
|
|
send_wr->send_flags = IB_SEND_SIGNALED;
|
|
}
|
|
|
|
static int
|
|
isert_login_post_recv(struct isert_conn *isert_conn)
|
|
{
|
|
struct ib_recv_wr rx_wr, *rx_wr_fail;
|
|
struct ib_sge sge;
|
|
int ret;
|
|
|
|
memset(&sge, 0, sizeof(struct ib_sge));
|
|
sge.addr = isert_conn->login_req_dma;
|
|
sge.length = ISER_RX_PAYLOAD_SIZE;
|
|
sge.lkey = isert_conn->device->pd->local_dma_lkey;
|
|
|
|
isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
|
|
sge.addr, sge.length, sge.lkey);
|
|
|
|
isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
|
|
|
|
memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
|
|
rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
|
|
rx_wr.sg_list = &sge;
|
|
rx_wr.num_sge = 1;
|
|
|
|
ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
|
|
if (ret)
|
|
isert_err("ib_post_recv() failed: %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
|
|
u32 length)
|
|
{
|
|
struct isert_conn *isert_conn = conn->context;
|
|
struct isert_device *device = isert_conn->device;
|
|
struct ib_device *ib_dev = device->ib_device;
|
|
struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
|
|
int ret;
|
|
|
|
isert_create_send_desc(isert_conn, NULL, tx_desc);
|
|
|
|
memcpy(&tx_desc->iscsi_header, &login->rsp[0],
|
|
sizeof(struct iscsi_hdr));
|
|
|
|
isert_init_tx_hdrs(isert_conn, tx_desc);
|
|
|
|
if (length > 0) {
|
|
struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
|
|
|
|
ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
|
|
length, DMA_TO_DEVICE);
|
|
|
|
memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
|
|
|
|
ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
|
|
length, DMA_TO_DEVICE);
|
|
|
|
tx_dsg->addr = isert_conn->login_rsp_dma;
|
|
tx_dsg->length = length;
|
|
tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
|
|
tx_desc->num_sge = 2;
|
|
}
|
|
if (!login->login_failed) {
|
|
if (login->login_complete) {
|
|
ret = isert_alloc_rx_descriptors(isert_conn);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = isert_post_recvm(isert_conn,
|
|
ISERT_QP_MAX_RECV_DTOS);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Now we are in FULL_FEATURE phase */
|
|
mutex_lock(&isert_conn->mutex);
|
|
isert_conn->state = ISER_CONN_FULL_FEATURE;
|
|
mutex_unlock(&isert_conn->mutex);
|
|
goto post_send;
|
|
}
|
|
|
|
ret = isert_login_post_recv(isert_conn);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
post_send:
|
|
ret = isert_login_post_send(isert_conn, tx_desc);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
isert_rx_login_req(struct isert_conn *isert_conn)
|
|
{
|
|
struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
|
|
int rx_buflen = isert_conn->login_req_len;
|
|
struct iscsi_conn *conn = isert_conn->conn;
|
|
struct iscsi_login *login = conn->conn_login;
|
|
int size;
|
|
|
|
isert_info("conn %p\n", isert_conn);
|
|
|
|
WARN_ON_ONCE(!login);
|
|
|
|
if (login->first_request) {
|
|
struct iscsi_login_req *login_req =
|
|
(struct iscsi_login_req *)&rx_desc->iscsi_header;
|
|
/*
|
|
* Setup the initial iscsi_login values from the leading
|
|
* login request PDU.
|
|
*/
|
|
login->leading_connection = (!login_req->tsih) ? 1 : 0;
|
|
login->current_stage =
|
|
(login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
|
|
>> 2;
|
|
login->version_min = login_req->min_version;
|
|
login->version_max = login_req->max_version;
|
|
memcpy(login->isid, login_req->isid, 6);
|
|
login->cmd_sn = be32_to_cpu(login_req->cmdsn);
|
|
login->init_task_tag = login_req->itt;
|
|
login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
|
|
login->cid = be16_to_cpu(login_req->cid);
|
|
login->tsih = be16_to_cpu(login_req->tsih);
|
|
}
|
|
|
|
memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
|
|
|
|
size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
|
|
isert_dbg("Using login payload size: %d, rx_buflen: %d "
|
|
"MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
|
|
MAX_KEY_VALUE_PAIRS);
|
|
memcpy(login->req_buf, &rx_desc->data[0], size);
|
|
|
|
if (login->first_request) {
|
|
complete(&isert_conn->login_comp);
|
|
return;
|
|
}
|
|
schedule_delayed_work(&conn->login_work, 0);
|
|
}
|
|
|
|
static struct iscsi_cmd
|
|
*isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
|
|
{
|
|
struct isert_conn *isert_conn = conn->context;
|
|
struct isert_cmd *isert_cmd;
|
|
struct iscsi_cmd *cmd;
|
|
|
|
cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
|
|
if (!cmd) {
|
|
isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
|
|
return NULL;
|
|
}
|
|
isert_cmd = iscsit_priv_cmd(cmd);
|
|
isert_cmd->conn = isert_conn;
|
|
isert_cmd->iscsi_cmd = cmd;
|
|
isert_cmd->rx_desc = rx_desc;
|
|
|
|
return cmd;
|
|
}
|
|
|
|
static int
|
|
isert_handle_scsi_cmd(struct isert_conn *isert_conn,
|
|
struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
|
|
struct iser_rx_desc *rx_desc, unsigned char *buf)
|
|
{
|
|
struct iscsi_conn *conn = isert_conn->conn;
|
|
struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
|
|
int imm_data, imm_data_len, unsol_data, sg_nents, rc;
|
|
bool dump_payload = false;
|
|
unsigned int data_len;
|
|
|
|
rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
imm_data = cmd->immediate_data;
|
|
imm_data_len = cmd->first_burst_len;
|
|
unsol_data = cmd->unsolicited_data;
|
|
data_len = cmd->se_cmd.data_length;
|
|
|
|
if (imm_data && imm_data_len == data_len)
|
|
cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
|
|
rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
|
|
if (rc < 0) {
|
|
return 0;
|
|
} else if (rc > 0) {
|
|
dump_payload = true;
|
|
goto sequence_cmd;
|
|
}
|
|
|
|
if (!imm_data)
|
|
return 0;
|
|
|
|
if (imm_data_len != data_len) {
|
|
sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
|
|
sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
|
|
&rx_desc->data[0], imm_data_len);
|
|
isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
|
|
sg_nents, imm_data_len);
|
|
} else {
|
|
sg_init_table(&isert_cmd->sg, 1);
|
|
cmd->se_cmd.t_data_sg = &isert_cmd->sg;
|
|
cmd->se_cmd.t_data_nents = 1;
|
|
sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
|
|
isert_dbg("Transfer Immediate imm_data_len: %d\n",
|
|
imm_data_len);
|
|
}
|
|
|
|
cmd->write_data_done += imm_data_len;
|
|
|
|
if (cmd->write_data_done == cmd->se_cmd.data_length) {
|
|
spin_lock_bh(&cmd->istate_lock);
|
|
cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
|
|
cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
}
|
|
|
|
sequence_cmd:
|
|
rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
|
|
|
|
if (!rc && dump_payload == false && unsol_data)
|
|
iscsit_set_unsoliticed_dataout(cmd);
|
|
else if (dump_payload && imm_data)
|
|
target_put_sess_cmd(&cmd->se_cmd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
|
|
struct iser_rx_desc *rx_desc, unsigned char *buf)
|
|
{
|
|
struct scatterlist *sg_start;
|
|
struct iscsi_conn *conn = isert_conn->conn;
|
|
struct iscsi_cmd *cmd = NULL;
|
|
struct iscsi_data *hdr = (struct iscsi_data *)buf;
|
|
u32 unsol_data_len = ntoh24(hdr->dlength);
|
|
int rc, sg_nents, sg_off, page_off;
|
|
|
|
rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
|
|
if (rc < 0)
|
|
return rc;
|
|
else if (!cmd)
|
|
return 0;
|
|
/*
|
|
* FIXME: Unexpected unsolicited_data out
|
|
*/
|
|
if (!cmd->unsolicited_data) {
|
|
isert_err("Received unexpected solicited data payload\n");
|
|
dump_stack();
|
|
return -1;
|
|
}
|
|
|
|
isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
|
|
"write_data_done: %u, data_length: %u\n",
|
|
unsol_data_len, cmd->write_data_done,
|
|
cmd->se_cmd.data_length);
|
|
|
|
sg_off = cmd->write_data_done / PAGE_SIZE;
|
|
sg_start = &cmd->se_cmd.t_data_sg[sg_off];
|
|
sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
|
|
page_off = cmd->write_data_done % PAGE_SIZE;
|
|
/*
|
|
* FIXME: Non page-aligned unsolicited_data out
|
|
*/
|
|
if (page_off) {
|
|
isert_err("unexpected non-page aligned data payload\n");
|
|
dump_stack();
|
|
return -1;
|
|
}
|
|
isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
|
|
"sg_nents: %u from %p %u\n", sg_start, sg_off,
|
|
sg_nents, &rx_desc->data[0], unsol_data_len);
|
|
|
|
sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
|
|
unsol_data_len);
|
|
|
|
rc = iscsit_check_dataout_payload(cmd, hdr, false);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
/*
|
|
* multiple data-outs on the same command can arrive -
|
|
* so post the buffer before hand
|
|
*/
|
|
rc = isert_post_recv(isert_conn, rx_desc);
|
|
if (rc) {
|
|
isert_err("ib_post_recv failed with %d\n", rc);
|
|
return rc;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
|
|
struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
|
|
unsigned char *buf)
|
|
{
|
|
struct iscsi_conn *conn = isert_conn->conn;
|
|
struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
|
|
int rc;
|
|
|
|
rc = iscsit_setup_nop_out(conn, cmd, hdr);
|
|
if (rc < 0)
|
|
return rc;
|
|
/*
|
|
* FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
|
|
*/
|
|
|
|
return iscsit_process_nop_out(conn, cmd, hdr);
|
|
}
|
|
|
|
static int
|
|
isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
|
|
struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
|
|
struct iscsi_text *hdr)
|
|
{
|
|
struct iscsi_conn *conn = isert_conn->conn;
|
|
u32 payload_length = ntoh24(hdr->dlength);
|
|
int rc;
|
|
unsigned char *text_in = NULL;
|
|
|
|
rc = iscsit_setup_text_cmd(conn, cmd, hdr);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
if (payload_length) {
|
|
text_in = kzalloc(payload_length, GFP_KERNEL);
|
|
if (!text_in)
|
|
return -ENOMEM;
|
|
}
|
|
cmd->text_in_ptr = text_in;
|
|
|
|
memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
|
|
|
|
return iscsit_process_text_cmd(conn, cmd, hdr);
|
|
}
|
|
|
|
static int
|
|
isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
|
|
uint32_t read_stag, uint64_t read_va,
|
|
uint32_t write_stag, uint64_t write_va)
|
|
{
|
|
struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
|
|
struct iscsi_conn *conn = isert_conn->conn;
|
|
struct iscsi_cmd *cmd;
|
|
struct isert_cmd *isert_cmd;
|
|
int ret = -EINVAL;
|
|
u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
|
|
|
|
if (conn->sess->sess_ops->SessionType &&
|
|
(!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
|
|
isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
|
|
" ignoring\n", opcode);
|
|
return 0;
|
|
}
|
|
|
|
switch (opcode) {
|
|
case ISCSI_OP_SCSI_CMD:
|
|
cmd = isert_allocate_cmd(conn, rx_desc);
|
|
if (!cmd)
|
|
break;
|
|
|
|
isert_cmd = iscsit_priv_cmd(cmd);
|
|
isert_cmd->read_stag = read_stag;
|
|
isert_cmd->read_va = read_va;
|
|
isert_cmd->write_stag = write_stag;
|
|
isert_cmd->write_va = write_va;
|
|
isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
|
|
|
|
ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
|
|
rx_desc, (unsigned char *)hdr);
|
|
break;
|
|
case ISCSI_OP_NOOP_OUT:
|
|
cmd = isert_allocate_cmd(conn, rx_desc);
|
|
if (!cmd)
|
|
break;
|
|
|
|
isert_cmd = iscsit_priv_cmd(cmd);
|
|
ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
|
|
rx_desc, (unsigned char *)hdr);
|
|
break;
|
|
case ISCSI_OP_SCSI_DATA_OUT:
|
|
ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
|
|
(unsigned char *)hdr);
|
|
break;
|
|
case ISCSI_OP_SCSI_TMFUNC:
|
|
cmd = isert_allocate_cmd(conn, rx_desc);
|
|
if (!cmd)
|
|
break;
|
|
|
|
ret = iscsit_handle_task_mgt_cmd(conn, cmd,
|
|
(unsigned char *)hdr);
|
|
break;
|
|
case ISCSI_OP_LOGOUT:
|
|
cmd = isert_allocate_cmd(conn, rx_desc);
|
|
if (!cmd)
|
|
break;
|
|
|
|
ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
|
|
break;
|
|
case ISCSI_OP_TEXT:
|
|
if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
|
|
cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
|
|
else
|
|
cmd = isert_allocate_cmd(conn, rx_desc);
|
|
|
|
if (!cmd)
|
|
break;
|
|
|
|
isert_cmd = iscsit_priv_cmd(cmd);
|
|
ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
|
|
rx_desc, (struct iscsi_text *)hdr);
|
|
break;
|
|
default:
|
|
isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
|
|
dump_stack();
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
isert_print_wc(struct ib_wc *wc, const char *type)
|
|
{
|
|
if (wc->status != IB_WC_WR_FLUSH_ERR)
|
|
isert_err("%s failure: %s (%d) vend_err %x\n", type,
|
|
ib_wc_status_msg(wc->status), wc->status,
|
|
wc->vendor_err);
|
|
else
|
|
isert_dbg("%s failure: %s (%d)\n", type,
|
|
ib_wc_status_msg(wc->status), wc->status);
|
|
}
|
|
|
|
static void
|
|
isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
struct isert_conn *isert_conn = wc->qp->qp_context;
|
|
struct ib_device *ib_dev = isert_conn->cm_id->device;
|
|
struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
|
|
struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
|
|
struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
|
|
uint64_t read_va = 0, write_va = 0;
|
|
uint32_t read_stag = 0, write_stag = 0;
|
|
|
|
if (unlikely(wc->status != IB_WC_SUCCESS)) {
|
|
isert_print_wc(wc, "recv");
|
|
if (wc->status != IB_WC_WR_FLUSH_ERR)
|
|
iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
|
|
return;
|
|
}
|
|
|
|
rx_desc->in_use = true;
|
|
|
|
ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
|
|
ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
|
|
|
|
isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
|
|
rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
|
|
(int)(wc->byte_len - ISER_HEADERS_LEN));
|
|
|
|
switch (iser_ctrl->flags & 0xF0) {
|
|
case ISCSI_CTRL:
|
|
if (iser_ctrl->flags & ISER_RSV) {
|
|
read_stag = be32_to_cpu(iser_ctrl->read_stag);
|
|
read_va = be64_to_cpu(iser_ctrl->read_va);
|
|
isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
|
|
read_stag, (unsigned long long)read_va);
|
|
}
|
|
if (iser_ctrl->flags & ISER_WSV) {
|
|
write_stag = be32_to_cpu(iser_ctrl->write_stag);
|
|
write_va = be64_to_cpu(iser_ctrl->write_va);
|
|
isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
|
|
write_stag, (unsigned long long)write_va);
|
|
}
|
|
|
|
isert_dbg("ISER ISCSI_CTRL PDU\n");
|
|
break;
|
|
case ISER_HELLO:
|
|
isert_err("iSER Hello message\n");
|
|
break;
|
|
default:
|
|
isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
|
|
break;
|
|
}
|
|
|
|
isert_rx_opcode(isert_conn, rx_desc,
|
|
read_stag, read_va, write_stag, write_va);
|
|
|
|
ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
|
|
ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
|
|
}
|
|
|
|
static void
|
|
isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
struct isert_conn *isert_conn = wc->qp->qp_context;
|
|
struct ib_device *ib_dev = isert_conn->device->ib_device;
|
|
|
|
if (unlikely(wc->status != IB_WC_SUCCESS)) {
|
|
isert_print_wc(wc, "login recv");
|
|
return;
|
|
}
|
|
|
|
ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
|
|
ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
|
|
|
|
isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
|
|
|
|
if (isert_conn->conn) {
|
|
struct iscsi_login *login = isert_conn->conn->conn_login;
|
|
|
|
if (login && !login->first_request)
|
|
isert_rx_login_req(isert_conn);
|
|
}
|
|
|
|
mutex_lock(&isert_conn->mutex);
|
|
complete(&isert_conn->login_req_comp);
|
|
mutex_unlock(&isert_conn->mutex);
|
|
|
|
ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
|
|
ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
|
|
}
|
|
|
|
static void
|
|
isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
|
|
{
|
|
struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
|
|
enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
|
|
|
|
if (!cmd->rw.nr_ops)
|
|
return;
|
|
|
|
if (isert_prot_cmd(conn, se_cmd)) {
|
|
rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
|
|
conn->cm_id->port_num, se_cmd->t_data_sg,
|
|
se_cmd->t_data_nents, se_cmd->t_prot_sg,
|
|
se_cmd->t_prot_nents, dir);
|
|
} else {
|
|
rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
|
|
se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
|
|
}
|
|
|
|
cmd->rw.nr_ops = 0;
|
|
}
|
|
|
|
static void
|
|
isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
|
|
{
|
|
struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
|
|
struct isert_conn *isert_conn = isert_cmd->conn;
|
|
struct iscsi_conn *conn = isert_conn->conn;
|
|
struct iscsi_text_rsp *hdr;
|
|
|
|
isert_dbg("Cmd %p\n", isert_cmd);
|
|
|
|
switch (cmd->iscsi_opcode) {
|
|
case ISCSI_OP_SCSI_CMD:
|
|
spin_lock_bh(&conn->cmd_lock);
|
|
if (!list_empty(&cmd->i_conn_node))
|
|
list_del_init(&cmd->i_conn_node);
|
|
spin_unlock_bh(&conn->cmd_lock);
|
|
|
|
if (cmd->data_direction == DMA_TO_DEVICE) {
|
|
iscsit_stop_dataout_timer(cmd);
|
|
/*
|
|
* Check for special case during comp_err where
|
|
* WRITE_PENDING has been handed off from core,
|
|
* but requires an extra target_put_sess_cmd()
|
|
* before transport_generic_free_cmd() below.
|
|
*/
|
|
if (comp_err &&
|
|
cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
|
|
struct se_cmd *se_cmd = &cmd->se_cmd;
|
|
|
|
target_put_sess_cmd(se_cmd);
|
|
}
|
|
}
|
|
|
|
isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
|
|
transport_generic_free_cmd(&cmd->se_cmd, 0);
|
|
break;
|
|
case ISCSI_OP_SCSI_TMFUNC:
|
|
spin_lock_bh(&conn->cmd_lock);
|
|
if (!list_empty(&cmd->i_conn_node))
|
|
list_del_init(&cmd->i_conn_node);
|
|
spin_unlock_bh(&conn->cmd_lock);
|
|
|
|
transport_generic_free_cmd(&cmd->se_cmd, 0);
|
|
break;
|
|
case ISCSI_OP_REJECT:
|
|
case ISCSI_OP_NOOP_OUT:
|
|
case ISCSI_OP_TEXT:
|
|
hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
|
|
/* If the continue bit is on, keep the command alive */
|
|
if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
|
|
break;
|
|
|
|
spin_lock_bh(&conn->cmd_lock);
|
|
if (!list_empty(&cmd->i_conn_node))
|
|
list_del_init(&cmd->i_conn_node);
|
|
spin_unlock_bh(&conn->cmd_lock);
|
|
|
|
/*
|
|
* Handle special case for REJECT when iscsi_add_reject*() has
|
|
* overwritten the original iscsi_opcode assignment, and the
|
|
* associated cmd->se_cmd needs to be released.
|
|
*/
|
|
if (cmd->se_cmd.se_tfo != NULL) {
|
|
isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
|
|
cmd->iscsi_opcode);
|
|
transport_generic_free_cmd(&cmd->se_cmd, 0);
|
|
break;
|
|
}
|
|
/*
|
|
* Fall-through
|
|
*/
|
|
default:
|
|
iscsit_release_cmd(cmd);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
|
|
{
|
|
if (tx_desc->dma_addr != 0) {
|
|
isert_dbg("unmap single for tx_desc->dma_addr\n");
|
|
ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
|
|
ISER_HEADERS_LEN, DMA_TO_DEVICE);
|
|
tx_desc->dma_addr = 0;
|
|
}
|
|
}
|
|
|
|
static void
|
|
isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
|
|
struct ib_device *ib_dev, bool comp_err)
|
|
{
|
|
if (isert_cmd->pdu_buf_dma != 0) {
|
|
isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
|
|
ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
|
|
isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
|
|
isert_cmd->pdu_buf_dma = 0;
|
|
}
|
|
|
|
isert_unmap_tx_desc(tx_desc, ib_dev);
|
|
isert_put_cmd(isert_cmd, comp_err);
|
|
}
|
|
|
|
static int
|
|
isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
|
|
{
|
|
struct ib_mr_status mr_status;
|
|
int ret;
|
|
|
|
ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
|
|
if (ret) {
|
|
isert_err("ib_check_mr_status failed, ret %d\n", ret);
|
|
goto fail_mr_status;
|
|
}
|
|
|
|
if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
|
|
u64 sec_offset_err;
|
|
u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
|
|
|
|
switch (mr_status.sig_err.err_type) {
|
|
case IB_SIG_BAD_GUARD:
|
|
se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
|
|
break;
|
|
case IB_SIG_BAD_REFTAG:
|
|
se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
|
|
break;
|
|
case IB_SIG_BAD_APPTAG:
|
|
se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
|
|
break;
|
|
}
|
|
sec_offset_err = mr_status.sig_err.sig_err_offset;
|
|
do_div(sec_offset_err, block_size);
|
|
se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
|
|
|
|
isert_err("PI error found type %d at sector 0x%llx "
|
|
"expected 0x%x vs actual 0x%x\n",
|
|
mr_status.sig_err.err_type,
|
|
(unsigned long long)se_cmd->bad_sector,
|
|
mr_status.sig_err.expected,
|
|
mr_status.sig_err.actual);
|
|
ret = 1;
|
|
}
|
|
|
|
fail_mr_status:
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
struct isert_conn *isert_conn = wc->qp->qp_context;
|
|
struct isert_device *device = isert_conn->device;
|
|
struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
|
|
struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
|
|
struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
|
|
int ret = 0;
|
|
|
|
if (unlikely(wc->status != IB_WC_SUCCESS)) {
|
|
isert_print_wc(wc, "rdma write");
|
|
if (wc->status != IB_WC_WR_FLUSH_ERR)
|
|
iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
|
|
isert_completion_put(desc, isert_cmd, device->ib_device, true);
|
|
return;
|
|
}
|
|
|
|
isert_dbg("Cmd %p\n", isert_cmd);
|
|
|
|
ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
|
|
isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
|
|
|
|
if (ret) {
|
|
/*
|
|
* transport_generic_request_failure() expects to have
|
|
* plus two references to handle queue-full, so re-add
|
|
* one here as target-core will have already dropped
|
|
* it after the first isert_put_datain() callback.
|
|
*/
|
|
kref_get(&cmd->cmd_kref);
|
|
transport_generic_request_failure(cmd, cmd->pi_err);
|
|
} else {
|
|
/*
|
|
* XXX: isert_put_response() failure is not retried.
|
|
*/
|
|
ret = isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
|
|
if (ret)
|
|
pr_warn_ratelimited("isert_put_response() ret: %d\n", ret);
|
|
}
|
|
}
|
|
|
|
static void
|
|
isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
struct isert_conn *isert_conn = wc->qp->qp_context;
|
|
struct isert_device *device = isert_conn->device;
|
|
struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
|
|
struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
|
|
struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
|
|
struct se_cmd *se_cmd = &cmd->se_cmd;
|
|
int ret = 0;
|
|
|
|
if (unlikely(wc->status != IB_WC_SUCCESS)) {
|
|
isert_print_wc(wc, "rdma read");
|
|
if (wc->status != IB_WC_WR_FLUSH_ERR)
|
|
iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
|
|
isert_completion_put(desc, isert_cmd, device->ib_device, true);
|
|
return;
|
|
}
|
|
|
|
isert_dbg("Cmd %p\n", isert_cmd);
|
|
|
|
iscsit_stop_dataout_timer(cmd);
|
|
|
|
if (isert_prot_cmd(isert_conn, se_cmd))
|
|
ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
|
|
isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
|
|
cmd->write_data_done = 0;
|
|
|
|
isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
|
|
spin_lock_bh(&cmd->istate_lock);
|
|
cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
|
|
cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
|
|
/*
|
|
* transport_generic_request_failure() will drop the extra
|
|
* se_cmd->cmd_kref reference after T10-PI error, and handle
|
|
* any non-zero ->queue_status() callback error retries.
|
|
*/
|
|
if (ret)
|
|
transport_generic_request_failure(se_cmd, se_cmd->pi_err);
|
|
else
|
|
target_execute_cmd(se_cmd);
|
|
}
|
|
|
|
static void
|
|
isert_do_control_comp(struct work_struct *work)
|
|
{
|
|
struct isert_cmd *isert_cmd = container_of(work,
|
|
struct isert_cmd, comp_work);
|
|
struct isert_conn *isert_conn = isert_cmd->conn;
|
|
struct ib_device *ib_dev = isert_conn->cm_id->device;
|
|
struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
|
|
|
|
isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
|
|
|
|
switch (cmd->i_state) {
|
|
case ISTATE_SEND_TASKMGTRSP:
|
|
iscsit_tmr_post_handler(cmd, cmd->conn);
|
|
case ISTATE_SEND_REJECT: /* FALLTHRU */
|
|
case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
|
|
cmd->i_state = ISTATE_SENT_STATUS;
|
|
isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
|
|
ib_dev, false);
|
|
break;
|
|
case ISTATE_SEND_LOGOUTRSP:
|
|
iscsit_logout_post_handler(cmd, cmd->conn);
|
|
break;
|
|
default:
|
|
isert_err("Unknown i_state %d\n", cmd->i_state);
|
|
dump_stack();
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
struct isert_conn *isert_conn = wc->qp->qp_context;
|
|
struct ib_device *ib_dev = isert_conn->cm_id->device;
|
|
struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
|
|
|
|
if (unlikely(wc->status != IB_WC_SUCCESS)) {
|
|
isert_print_wc(wc, "login send");
|
|
if (wc->status != IB_WC_WR_FLUSH_ERR)
|
|
iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
|
|
}
|
|
|
|
isert_unmap_tx_desc(tx_desc, ib_dev);
|
|
}
|
|
|
|
static void
|
|
isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
struct isert_conn *isert_conn = wc->qp->qp_context;
|
|
struct ib_device *ib_dev = isert_conn->cm_id->device;
|
|
struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
|
|
struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
|
|
|
|
if (unlikely(wc->status != IB_WC_SUCCESS)) {
|
|
isert_print_wc(wc, "send");
|
|
if (wc->status != IB_WC_WR_FLUSH_ERR)
|
|
iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
|
|
isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
|
|
return;
|
|
}
|
|
|
|
isert_dbg("Cmd %p\n", isert_cmd);
|
|
|
|
switch (isert_cmd->iscsi_cmd->i_state) {
|
|
case ISTATE_SEND_TASKMGTRSP:
|
|
case ISTATE_SEND_LOGOUTRSP:
|
|
case ISTATE_SEND_REJECT:
|
|
case ISTATE_SEND_TEXTRSP:
|
|
isert_unmap_tx_desc(tx_desc, ib_dev);
|
|
|
|
INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
|
|
queue_work(isert_comp_wq, &isert_cmd->comp_work);
|
|
return;
|
|
default:
|
|
isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
|
|
isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int
|
|
isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
|
|
{
|
|
struct ib_send_wr *wr_failed;
|
|
int ret;
|
|
|
|
ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
|
|
if (ret) {
|
|
isert_err("ib_post_recv failed with %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
|
|
&wr_failed);
|
|
if (ret) {
|
|
isert_err("ib_post_send failed with %d\n", ret);
|
|
return ret;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
|
|
{
|
|
struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
|
|
struct isert_conn *isert_conn = conn->context;
|
|
struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
|
|
struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
|
|
&isert_cmd->tx_desc.iscsi_header;
|
|
|
|
isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
|
|
iscsit_build_rsp_pdu(cmd, conn, true, hdr);
|
|
isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
|
|
/*
|
|
* Attach SENSE DATA payload to iSCSI Response PDU
|
|
*/
|
|
if (cmd->se_cmd.sense_buffer &&
|
|
((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
|
|
(cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
|
|
struct isert_device *device = isert_conn->device;
|
|
struct ib_device *ib_dev = device->ib_device;
|
|
struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
|
|
u32 padding, pdu_len;
|
|
|
|
put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
|
|
cmd->sense_buffer);
|
|
cmd->se_cmd.scsi_sense_length += sizeof(__be16);
|
|
|
|
padding = -(cmd->se_cmd.scsi_sense_length) & 3;
|
|
hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
|
|
pdu_len = cmd->se_cmd.scsi_sense_length + padding;
|
|
|
|
isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
|
|
(void *)cmd->sense_buffer, pdu_len,
|
|
DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
|
|
return -ENOMEM;
|
|
|
|
isert_cmd->pdu_buf_len = pdu_len;
|
|
tx_dsg->addr = isert_cmd->pdu_buf_dma;
|
|
tx_dsg->length = pdu_len;
|
|
tx_dsg->lkey = device->pd->local_dma_lkey;
|
|
isert_cmd->tx_desc.num_sge = 2;
|
|
}
|
|
|
|
isert_init_send_wr(isert_conn, isert_cmd, send_wr);
|
|
|
|
isert_dbg("Posting SCSI Response\n");
|
|
|
|
return isert_post_response(isert_conn, isert_cmd);
|
|
}
|
|
|
|
static void
|
|
isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
|
|
{
|
|
struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
|
|
struct isert_conn *isert_conn = conn->context;
|
|
|
|
spin_lock_bh(&conn->cmd_lock);
|
|
if (!list_empty(&cmd->i_conn_node))
|
|
list_del_init(&cmd->i_conn_node);
|
|
spin_unlock_bh(&conn->cmd_lock);
|
|
|
|
if (cmd->data_direction == DMA_TO_DEVICE)
|
|
iscsit_stop_dataout_timer(cmd);
|
|
isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
|
|
}
|
|
|
|
static enum target_prot_op
|
|
isert_get_sup_prot_ops(struct iscsi_conn *conn)
|
|
{
|
|
struct isert_conn *isert_conn = conn->context;
|
|
struct isert_device *device = isert_conn->device;
|
|
|
|
if (conn->tpg->tpg_attrib.t10_pi) {
|
|
if (device->pi_capable) {
|
|
isert_info("conn %p PI offload enabled\n", isert_conn);
|
|
isert_conn->pi_support = true;
|
|
return TARGET_PROT_ALL;
|
|
}
|
|
}
|
|
|
|
isert_info("conn %p PI offload disabled\n", isert_conn);
|
|
isert_conn->pi_support = false;
|
|
|
|
return TARGET_PROT_NORMAL;
|
|
}
|
|
|
|
static int
|
|
isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
|
|
bool nopout_response)
|
|
{
|
|
struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
|
|
struct isert_conn *isert_conn = conn->context;
|
|
struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
|
|
|
|
isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
|
|
iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
|
|
&isert_cmd->tx_desc.iscsi_header,
|
|
nopout_response);
|
|
isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
|
|
isert_init_send_wr(isert_conn, isert_cmd, send_wr);
|
|
|
|
isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
|
|
|
|
return isert_post_response(isert_conn, isert_cmd);
|
|
}
|
|
|
|
static int
|
|
isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
|
|
{
|
|
struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
|
|
struct isert_conn *isert_conn = conn->context;
|
|
struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
|
|
|
|
isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
|
|
iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
|
|
&isert_cmd->tx_desc.iscsi_header);
|
|
isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
|
|
isert_init_send_wr(isert_conn, isert_cmd, send_wr);
|
|
|
|
isert_dbg("conn %p Posting Logout Response\n", isert_conn);
|
|
|
|
return isert_post_response(isert_conn, isert_cmd);
|
|
}
|
|
|
|
static int
|
|
isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
|
|
{
|
|
struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
|
|
struct isert_conn *isert_conn = conn->context;
|
|
struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
|
|
|
|
isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
|
|
iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
|
|
&isert_cmd->tx_desc.iscsi_header);
|
|
isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
|
|
isert_init_send_wr(isert_conn, isert_cmd, send_wr);
|
|
|
|
isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
|
|
|
|
return isert_post_response(isert_conn, isert_cmd);
|
|
}
|
|
|
|
static int
|
|
isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
|
|
{
|
|
struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
|
|
struct isert_conn *isert_conn = conn->context;
|
|
struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
|
|
struct isert_device *device = isert_conn->device;
|
|
struct ib_device *ib_dev = device->ib_device;
|
|
struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
|
|
struct iscsi_reject *hdr =
|
|
(struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
|
|
|
|
isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
|
|
iscsit_build_reject(cmd, conn, hdr);
|
|
isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
|
|
|
|
hton24(hdr->dlength, ISCSI_HDR_LEN);
|
|
isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
|
|
(void *)cmd->buf_ptr, ISCSI_HDR_LEN,
|
|
DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
|
|
return -ENOMEM;
|
|
isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
|
|
tx_dsg->addr = isert_cmd->pdu_buf_dma;
|
|
tx_dsg->length = ISCSI_HDR_LEN;
|
|
tx_dsg->lkey = device->pd->local_dma_lkey;
|
|
isert_cmd->tx_desc.num_sge = 2;
|
|
|
|
isert_init_send_wr(isert_conn, isert_cmd, send_wr);
|
|
|
|
isert_dbg("conn %p Posting Reject\n", isert_conn);
|
|
|
|
return isert_post_response(isert_conn, isert_cmd);
|
|
}
|
|
|
|
static int
|
|
isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
|
|
{
|
|
struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
|
|
struct isert_conn *isert_conn = conn->context;
|
|
struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
|
|
struct iscsi_text_rsp *hdr =
|
|
(struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
|
|
u32 txt_rsp_len;
|
|
int rc;
|
|
|
|
isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
|
|
rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
txt_rsp_len = rc;
|
|
isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
|
|
|
|
if (txt_rsp_len) {
|
|
struct isert_device *device = isert_conn->device;
|
|
struct ib_device *ib_dev = device->ib_device;
|
|
struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
|
|
void *txt_rsp_buf = cmd->buf_ptr;
|
|
|
|
isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
|
|
txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
|
|
return -ENOMEM;
|
|
|
|
isert_cmd->pdu_buf_len = txt_rsp_len;
|
|
tx_dsg->addr = isert_cmd->pdu_buf_dma;
|
|
tx_dsg->length = txt_rsp_len;
|
|
tx_dsg->lkey = device->pd->local_dma_lkey;
|
|
isert_cmd->tx_desc.num_sge = 2;
|
|
}
|
|
isert_init_send_wr(isert_conn, isert_cmd, send_wr);
|
|
|
|
isert_dbg("conn %p Text Response\n", isert_conn);
|
|
|
|
return isert_post_response(isert_conn, isert_cmd);
|
|
}
|
|
|
|
static inline void
|
|
isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
|
|
struct ib_sig_domain *domain)
|
|
{
|
|
domain->sig_type = IB_SIG_TYPE_T10_DIF;
|
|
domain->sig.dif.bg_type = IB_T10DIF_CRC;
|
|
domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
|
|
domain->sig.dif.ref_tag = se_cmd->reftag_seed;
|
|
/*
|
|
* At the moment we hard code those, but if in the future
|
|
* the target core would like to use it, we will take it
|
|
* from se_cmd.
|
|
*/
|
|
domain->sig.dif.apptag_check_mask = 0xffff;
|
|
domain->sig.dif.app_escape = true;
|
|
domain->sig.dif.ref_escape = true;
|
|
if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
|
|
se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
|
|
domain->sig.dif.ref_remap = true;
|
|
};
|
|
|
|
static int
|
|
isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
|
|
{
|
|
memset(sig_attrs, 0, sizeof(*sig_attrs));
|
|
|
|
switch (se_cmd->prot_op) {
|
|
case TARGET_PROT_DIN_INSERT:
|
|
case TARGET_PROT_DOUT_STRIP:
|
|
sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
|
|
isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
|
|
break;
|
|
case TARGET_PROT_DOUT_INSERT:
|
|
case TARGET_PROT_DIN_STRIP:
|
|
sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
|
|
isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
|
|
break;
|
|
case TARGET_PROT_DIN_PASS:
|
|
case TARGET_PROT_DOUT_PASS:
|
|
isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
|
|
isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
|
|
break;
|
|
default:
|
|
isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
|
|
return -EINVAL;
|
|
}
|
|
|
|
sig_attrs->check_mask =
|
|
(se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
|
|
(se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
|
|
(se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
|
|
struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
|
|
{
|
|
struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
|
|
enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
|
|
u8 port_num = conn->cm_id->port_num;
|
|
u64 addr;
|
|
u32 rkey, offset;
|
|
int ret;
|
|
|
|
if (dir == DMA_FROM_DEVICE) {
|
|
addr = cmd->write_va;
|
|
rkey = cmd->write_stag;
|
|
offset = cmd->iscsi_cmd->write_data_done;
|
|
} else {
|
|
addr = cmd->read_va;
|
|
rkey = cmd->read_stag;
|
|
offset = 0;
|
|
}
|
|
|
|
if (isert_prot_cmd(conn, se_cmd)) {
|
|
struct ib_sig_attrs sig_attrs;
|
|
|
|
ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
|
|
if (ret)
|
|
return ret;
|
|
|
|
WARN_ON_ONCE(offset);
|
|
ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
|
|
se_cmd->t_data_sg, se_cmd->t_data_nents,
|
|
se_cmd->t_prot_sg, se_cmd->t_prot_nents,
|
|
&sig_attrs, addr, rkey, dir);
|
|
} else {
|
|
ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
|
|
se_cmd->t_data_sg, se_cmd->t_data_nents,
|
|
offset, addr, rkey, dir);
|
|
}
|
|
if (ret < 0) {
|
|
isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
|
|
return ret;
|
|
}
|
|
|
|
ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
|
|
if (ret < 0)
|
|
isert_err("Cmd: %p failed to post RDMA res\n", cmd);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
|
|
{
|
|
struct se_cmd *se_cmd = &cmd->se_cmd;
|
|
struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
|
|
struct isert_conn *isert_conn = conn->context;
|
|
struct ib_cqe *cqe = NULL;
|
|
struct ib_send_wr *chain_wr = NULL;
|
|
int rc;
|
|
|
|
isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
|
|
isert_cmd, se_cmd->data_length);
|
|
|
|
if (isert_prot_cmd(isert_conn, se_cmd)) {
|
|
isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
|
|
cqe = &isert_cmd->tx_desc.tx_cqe;
|
|
} else {
|
|
/*
|
|
* Build isert_conn->tx_desc for iSCSI response PDU and attach
|
|
*/
|
|
isert_create_send_desc(isert_conn, isert_cmd,
|
|
&isert_cmd->tx_desc);
|
|
iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
|
|
&isert_cmd->tx_desc.iscsi_header);
|
|
isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
|
|
isert_init_send_wr(isert_conn, isert_cmd,
|
|
&isert_cmd->tx_desc.send_wr);
|
|
|
|
rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
|
|
if (rc) {
|
|
isert_err("ib_post_recv failed with %d\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
chain_wr = &isert_cmd->tx_desc.send_wr;
|
|
}
|
|
|
|
rc = isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
|
|
isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n",
|
|
isert_cmd, rc);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
|
|
{
|
|
struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
|
|
int ret;
|
|
|
|
isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
|
|
isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
|
|
|
|
isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
|
|
ret = isert_rdma_rw_ctx_post(isert_cmd, conn->context,
|
|
&isert_cmd->tx_desc.tx_cqe, NULL);
|
|
|
|
isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n",
|
|
isert_cmd, ret);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
|
|
{
|
|
struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
|
|
int ret = 0;
|
|
|
|
switch (state) {
|
|
case ISTATE_REMOVE:
|
|
spin_lock_bh(&conn->cmd_lock);
|
|
list_del_init(&cmd->i_conn_node);
|
|
spin_unlock_bh(&conn->cmd_lock);
|
|
isert_put_cmd(isert_cmd, true);
|
|
break;
|
|
case ISTATE_SEND_NOPIN_WANT_RESPONSE:
|
|
ret = isert_put_nopin(cmd, conn, false);
|
|
break;
|
|
default:
|
|
isert_err("Unknown immediate state: 0x%02x\n", state);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
|
|
{
|
|
struct isert_conn *isert_conn = conn->context;
|
|
int ret;
|
|
|
|
switch (state) {
|
|
case ISTATE_SEND_LOGOUTRSP:
|
|
ret = isert_put_logout_rsp(cmd, conn);
|
|
if (!ret)
|
|
isert_conn->logout_posted = true;
|
|
break;
|
|
case ISTATE_SEND_NOPIN:
|
|
ret = isert_put_nopin(cmd, conn, true);
|
|
break;
|
|
case ISTATE_SEND_TASKMGTRSP:
|
|
ret = isert_put_tm_rsp(cmd, conn);
|
|
break;
|
|
case ISTATE_SEND_REJECT:
|
|
ret = isert_put_reject(cmd, conn);
|
|
break;
|
|
case ISTATE_SEND_TEXTRSP:
|
|
ret = isert_put_text_rsp(cmd, conn);
|
|
break;
|
|
case ISTATE_SEND_STATUS:
|
|
/*
|
|
* Special case for sending non GOOD SCSI status from TX thread
|
|
* context during pre se_cmd excecution failure.
|
|
*/
|
|
ret = isert_put_response(conn, cmd);
|
|
break;
|
|
default:
|
|
isert_err("Unknown response state: 0x%02x\n", state);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct rdma_cm_id *
|
|
isert_setup_id(struct isert_np *isert_np)
|
|
{
|
|
struct iscsi_np *np = isert_np->np;
|
|
struct rdma_cm_id *id;
|
|
struct sockaddr *sa;
|
|
int ret;
|
|
|
|
sa = (struct sockaddr *)&np->np_sockaddr;
|
|
isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
|
|
|
|
id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
|
|
RDMA_PS_TCP, IB_QPT_RC);
|
|
if (IS_ERR(id)) {
|
|
isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
|
|
ret = PTR_ERR(id);
|
|
goto out;
|
|
}
|
|
isert_dbg("id %p context %p\n", id, id->context);
|
|
|
|
ret = rdma_bind_addr(id, sa);
|
|
if (ret) {
|
|
isert_err("rdma_bind_addr() failed: %d\n", ret);
|
|
goto out_id;
|
|
}
|
|
|
|
ret = rdma_listen(id, 0);
|
|
if (ret) {
|
|
isert_err("rdma_listen() failed: %d\n", ret);
|
|
goto out_id;
|
|
}
|
|
|
|
return id;
|
|
out_id:
|
|
rdma_destroy_id(id);
|
|
out:
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static int
|
|
isert_setup_np(struct iscsi_np *np,
|
|
struct sockaddr_storage *ksockaddr)
|
|
{
|
|
struct isert_np *isert_np;
|
|
struct rdma_cm_id *isert_lid;
|
|
int ret;
|
|
|
|
isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
|
|
if (!isert_np)
|
|
return -ENOMEM;
|
|
|
|
sema_init(&isert_np->sem, 0);
|
|
mutex_init(&isert_np->mutex);
|
|
INIT_LIST_HEAD(&isert_np->accepted);
|
|
INIT_LIST_HEAD(&isert_np->pending);
|
|
isert_np->np = np;
|
|
|
|
/*
|
|
* Setup the np->np_sockaddr from the passed sockaddr setup
|
|
* in iscsi_target_configfs.c code..
|
|
*/
|
|
memcpy(&np->np_sockaddr, ksockaddr,
|
|
sizeof(struct sockaddr_storage));
|
|
|
|
isert_lid = isert_setup_id(isert_np);
|
|
if (IS_ERR(isert_lid)) {
|
|
ret = PTR_ERR(isert_lid);
|
|
goto out;
|
|
}
|
|
|
|
isert_np->cm_id = isert_lid;
|
|
np->np_context = isert_np;
|
|
|
|
return 0;
|
|
|
|
out:
|
|
kfree(isert_np);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
isert_rdma_accept(struct isert_conn *isert_conn)
|
|
{
|
|
struct rdma_cm_id *cm_id = isert_conn->cm_id;
|
|
struct rdma_conn_param cp;
|
|
int ret;
|
|
struct iser_cm_hdr rsp_hdr;
|
|
|
|
memset(&cp, 0, sizeof(struct rdma_conn_param));
|
|
cp.initiator_depth = isert_conn->initiator_depth;
|
|
cp.retry_count = 7;
|
|
cp.rnr_retry_count = 7;
|
|
|
|
memset(&rsp_hdr, 0, sizeof(rsp_hdr));
|
|
rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
|
|
if (!isert_conn->snd_w_inv)
|
|
rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
|
|
cp.private_data = (void *)&rsp_hdr;
|
|
cp.private_data_len = sizeof(rsp_hdr);
|
|
|
|
ret = rdma_accept(cm_id, &cp);
|
|
if (ret) {
|
|
isert_err("rdma_accept() failed with: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
|
|
{
|
|
struct isert_conn *isert_conn = conn->context;
|
|
int ret;
|
|
|
|
isert_info("before login_req comp conn: %p\n", isert_conn);
|
|
ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
|
|
if (ret) {
|
|
isert_err("isert_conn %p interrupted before got login req\n",
|
|
isert_conn);
|
|
return ret;
|
|
}
|
|
reinit_completion(&isert_conn->login_req_comp);
|
|
|
|
/*
|
|
* For login requests after the first PDU, isert_rx_login_req() will
|
|
* kick schedule_delayed_work(&conn->login_work) as the packet is
|
|
* received, which turns this callback from iscsi_target_do_login_rx()
|
|
* into a NOP.
|
|
*/
|
|
if (!login->first_request)
|
|
return 0;
|
|
|
|
isert_rx_login_req(isert_conn);
|
|
|
|
isert_info("before login_comp conn: %p\n", conn);
|
|
ret = wait_for_completion_interruptible(&isert_conn->login_comp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
isert_info("processing login->req: %p\n", login->req);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
|
|
struct isert_conn *isert_conn)
|
|
{
|
|
struct rdma_cm_id *cm_id = isert_conn->cm_id;
|
|
struct rdma_route *cm_route = &cm_id->route;
|
|
|
|
conn->login_family = np->np_sockaddr.ss_family;
|
|
|
|
conn->login_sockaddr = cm_route->addr.dst_addr;
|
|
conn->local_sockaddr = cm_route->addr.src_addr;
|
|
}
|
|
|
|
static int
|
|
isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
|
|
{
|
|
struct isert_np *isert_np = np->np_context;
|
|
struct isert_conn *isert_conn;
|
|
int ret;
|
|
|
|
accept_wait:
|
|
ret = down_interruptible(&isert_np->sem);
|
|
if (ret)
|
|
return -ENODEV;
|
|
|
|
spin_lock_bh(&np->np_thread_lock);
|
|
if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
|
|
spin_unlock_bh(&np->np_thread_lock);
|
|
isert_dbg("np_thread_state %d\n",
|
|
np->np_thread_state);
|
|
/**
|
|
* No point in stalling here when np_thread
|
|
* is in state RESET/SHUTDOWN/EXIT - bail
|
|
**/
|
|
return -ENODEV;
|
|
}
|
|
spin_unlock_bh(&np->np_thread_lock);
|
|
|
|
mutex_lock(&isert_np->mutex);
|
|
if (list_empty(&isert_np->pending)) {
|
|
mutex_unlock(&isert_np->mutex);
|
|
goto accept_wait;
|
|
}
|
|
isert_conn = list_first_entry(&isert_np->pending,
|
|
struct isert_conn, node);
|
|
list_del_init(&isert_conn->node);
|
|
mutex_unlock(&isert_np->mutex);
|
|
|
|
conn->context = isert_conn;
|
|
isert_conn->conn = conn;
|
|
isert_conn->state = ISER_CONN_BOUND;
|
|
|
|
isert_set_conn_info(np, conn, isert_conn);
|
|
|
|
isert_dbg("Processing isert_conn: %p\n", isert_conn);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
isert_free_np(struct iscsi_np *np)
|
|
{
|
|
struct isert_np *isert_np = np->np_context;
|
|
struct isert_conn *isert_conn, *n;
|
|
|
|
if (isert_np->cm_id)
|
|
rdma_destroy_id(isert_np->cm_id);
|
|
|
|
/*
|
|
* FIXME: At this point we don't have a good way to insure
|
|
* that at this point we don't have hanging connections that
|
|
* completed RDMA establishment but didn't start iscsi login
|
|
* process. So work-around this by cleaning up what ever piled
|
|
* up in accepted and pending lists.
|
|
*/
|
|
mutex_lock(&isert_np->mutex);
|
|
if (!list_empty(&isert_np->pending)) {
|
|
isert_info("Still have isert pending connections\n");
|
|
list_for_each_entry_safe(isert_conn, n,
|
|
&isert_np->pending,
|
|
node) {
|
|
isert_info("cleaning isert_conn %p state (%d)\n",
|
|
isert_conn, isert_conn->state);
|
|
isert_connect_release(isert_conn);
|
|
}
|
|
}
|
|
|
|
if (!list_empty(&isert_np->accepted)) {
|
|
isert_info("Still have isert accepted connections\n");
|
|
list_for_each_entry_safe(isert_conn, n,
|
|
&isert_np->accepted,
|
|
node) {
|
|
isert_info("cleaning isert_conn %p state (%d)\n",
|
|
isert_conn, isert_conn->state);
|
|
isert_connect_release(isert_conn);
|
|
}
|
|
}
|
|
mutex_unlock(&isert_np->mutex);
|
|
|
|
np->np_context = NULL;
|
|
kfree(isert_np);
|
|
}
|
|
|
|
static void isert_release_work(struct work_struct *work)
|
|
{
|
|
struct isert_conn *isert_conn = container_of(work,
|
|
struct isert_conn,
|
|
release_work);
|
|
|
|
isert_info("Starting release conn %p\n", isert_conn);
|
|
|
|
mutex_lock(&isert_conn->mutex);
|
|
isert_conn->state = ISER_CONN_DOWN;
|
|
mutex_unlock(&isert_conn->mutex);
|
|
|
|
isert_info("Destroying conn %p\n", isert_conn);
|
|
isert_put_conn(isert_conn);
|
|
}
|
|
|
|
static void
|
|
isert_wait4logout(struct isert_conn *isert_conn)
|
|
{
|
|
struct iscsi_conn *conn = isert_conn->conn;
|
|
|
|
isert_info("conn %p\n", isert_conn);
|
|
|
|
if (isert_conn->logout_posted) {
|
|
isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
|
|
wait_for_completion_timeout(&conn->conn_logout_comp,
|
|
SECONDS_FOR_LOGOUT_COMP * HZ);
|
|
}
|
|
}
|
|
|
|
static void
|
|
isert_wait4cmds(struct iscsi_conn *conn)
|
|
{
|
|
isert_info("iscsi_conn %p\n", conn);
|
|
|
|
if (conn->sess) {
|
|
target_sess_cmd_list_set_waiting(conn->sess->se_sess);
|
|
target_wait_for_sess_cmds(conn->sess->se_sess);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* isert_put_unsol_pending_cmds() - Drop commands waiting for
|
|
* unsolicitate dataout
|
|
* @conn: iscsi connection
|
|
*
|
|
* We might still have commands that are waiting for unsolicited
|
|
* dataouts messages. We must put the extra reference on those
|
|
* before blocking on the target_wait_for_session_cmds
|
|
*/
|
|
static void
|
|
isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_cmd *cmd, *tmp;
|
|
static LIST_HEAD(drop_cmd_list);
|
|
|
|
spin_lock_bh(&conn->cmd_lock);
|
|
list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
|
|
if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
|
|
(cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
|
|
(cmd->write_data_done < cmd->se_cmd.data_length))
|
|
list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
|
|
}
|
|
spin_unlock_bh(&conn->cmd_lock);
|
|
|
|
list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
|
|
list_del_init(&cmd->i_conn_node);
|
|
if (cmd->i_state != ISTATE_REMOVE) {
|
|
struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
|
|
|
|
isert_info("conn %p dropping cmd %p\n", conn, cmd);
|
|
isert_put_cmd(isert_cmd, true);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void isert_wait_conn(struct iscsi_conn *conn)
|
|
{
|
|
struct isert_conn *isert_conn = conn->context;
|
|
|
|
isert_info("Starting conn %p\n", isert_conn);
|
|
|
|
mutex_lock(&isert_conn->mutex);
|
|
isert_conn_terminate(isert_conn);
|
|
mutex_unlock(&isert_conn->mutex);
|
|
|
|
ib_drain_qp(isert_conn->qp);
|
|
isert_put_unsol_pending_cmds(conn);
|
|
isert_wait4cmds(conn);
|
|
isert_wait4logout(isert_conn);
|
|
|
|
queue_work(isert_release_wq, &isert_conn->release_work);
|
|
}
|
|
|
|
static void isert_free_conn(struct iscsi_conn *conn)
|
|
{
|
|
struct isert_conn *isert_conn = conn->context;
|
|
|
|
ib_drain_qp(isert_conn->qp);
|
|
isert_put_conn(isert_conn);
|
|
}
|
|
|
|
static void isert_get_rx_pdu(struct iscsi_conn *conn)
|
|
{
|
|
struct completion comp;
|
|
|
|
init_completion(&comp);
|
|
|
|
wait_for_completion_interruptible(&comp);
|
|
}
|
|
|
|
static struct iscsit_transport iser_target_transport = {
|
|
.name = "IB/iSER",
|
|
.transport_type = ISCSI_INFINIBAND,
|
|
.rdma_shutdown = true,
|
|
.priv_size = sizeof(struct isert_cmd),
|
|
.owner = THIS_MODULE,
|
|
.iscsit_setup_np = isert_setup_np,
|
|
.iscsit_accept_np = isert_accept_np,
|
|
.iscsit_free_np = isert_free_np,
|
|
.iscsit_wait_conn = isert_wait_conn,
|
|
.iscsit_free_conn = isert_free_conn,
|
|
.iscsit_get_login_rx = isert_get_login_rx,
|
|
.iscsit_put_login_tx = isert_put_login_tx,
|
|
.iscsit_immediate_queue = isert_immediate_queue,
|
|
.iscsit_response_queue = isert_response_queue,
|
|
.iscsit_get_dataout = isert_get_dataout,
|
|
.iscsit_queue_data_in = isert_put_datain,
|
|
.iscsit_queue_status = isert_put_response,
|
|
.iscsit_aborted_task = isert_aborted_task,
|
|
.iscsit_get_rx_pdu = isert_get_rx_pdu,
|
|
.iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
|
|
};
|
|
|
|
static int __init isert_init(void)
|
|
{
|
|
int ret;
|
|
|
|
isert_comp_wq = alloc_workqueue("isert_comp_wq",
|
|
WQ_UNBOUND | WQ_HIGHPRI, 0);
|
|
if (!isert_comp_wq) {
|
|
isert_err("Unable to allocate isert_comp_wq\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
|
|
WQ_UNBOUND_MAX_ACTIVE);
|
|
if (!isert_release_wq) {
|
|
isert_err("Unable to allocate isert_release_wq\n");
|
|
ret = -ENOMEM;
|
|
goto destroy_comp_wq;
|
|
}
|
|
|
|
iscsit_register_transport(&iser_target_transport);
|
|
isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
|
|
|
|
return 0;
|
|
|
|
destroy_comp_wq:
|
|
destroy_workqueue(isert_comp_wq);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit isert_exit(void)
|
|
{
|
|
flush_scheduled_work();
|
|
destroy_workqueue(isert_release_wq);
|
|
destroy_workqueue(isert_comp_wq);
|
|
iscsit_unregister_transport(&iser_target_transport);
|
|
isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
|
|
}
|
|
|
|
MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
|
|
MODULE_VERSION("1.0");
|
|
MODULE_AUTHOR("nab@Linux-iSCSI.org");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(isert_init);
|
|
module_exit(isert_exit);
|