109345f65SFUJITA Tomonori /* 209345f65SFUJITA Tomonori * SCSI RDMA (SRP) transport class 309345f65SFUJITA Tomonori * 409345f65SFUJITA Tomonori * Copyright (C) 2007 FUJITA Tomonori <tomof@acm.org> 509345f65SFUJITA Tomonori * 609345f65SFUJITA Tomonori * This program is free software; you can redistribute it and/or 709345f65SFUJITA Tomonori * modify it under the terms of the GNU General Public License as 809345f65SFUJITA Tomonori * published by the Free Software Foundation, version 2 of the 909345f65SFUJITA Tomonori * License. 1009345f65SFUJITA Tomonori * 1109345f65SFUJITA Tomonori * This program is distributed in the hope that it will be useful, but 1209345f65SFUJITA Tomonori * WITHOUT ANY WARRANTY; without even the implied warranty of 1309345f65SFUJITA Tomonori * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 1409345f65SFUJITA Tomonori * General Public License for more details. 1509345f65SFUJITA Tomonori * 1609345f65SFUJITA Tomonori * You should have received a copy of the GNU General Public License 1709345f65SFUJITA Tomonori * along with this program; if not, write to the Free Software 1809345f65SFUJITA Tomonori * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 1909345f65SFUJITA Tomonori * 02110-1301 USA 2009345f65SFUJITA Tomonori */ 2109345f65SFUJITA Tomonori #include <linux/init.h> 2209345f65SFUJITA Tomonori #include <linux/module.h> 2309345f65SFUJITA Tomonori #include <linux/jiffies.h> 2409345f65SFUJITA Tomonori #include <linux/err.h> 2509345f65SFUJITA Tomonori #include <linux/slab.h> 2609345f65SFUJITA Tomonori #include <linux/string.h> 2729c17324SBart Van Assche #include <linux/delay.h> 2809345f65SFUJITA Tomonori 2909345f65SFUJITA Tomonori #include <scsi/scsi.h> 3029c17324SBart Van Assche #include <scsi/scsi_cmnd.h> 3109345f65SFUJITA Tomonori #include <scsi/scsi_device.h> 3209345f65SFUJITA Tomonori #include <scsi/scsi_host.h> 3309345f65SFUJITA Tomonori #include <scsi/scsi_transport.h> 3409345f65SFUJITA Tomonori #include <scsi/scsi_transport_srp.h> 3529c17324SBart Van Assche #include "scsi_priv.h" 360012fdf9SFUJITA Tomonori #include "scsi_transport_srp_internal.h" 3709345f65SFUJITA Tomonori 3809345f65SFUJITA Tomonori struct srp_host_attrs { 3909345f65SFUJITA Tomonori atomic_t next_port_id; 4009345f65SFUJITA Tomonori }; 4109345f65SFUJITA Tomonori #define to_srp_host_attrs(host) ((struct srp_host_attrs *)(host)->shost_data) 4209345f65SFUJITA Tomonori 4309345f65SFUJITA Tomonori #define SRP_HOST_ATTRS 0 448c64e453SBart Van Assche #define SRP_RPORT_ATTRS 8 4509345f65SFUJITA Tomonori 4609345f65SFUJITA Tomonori struct srp_internal { 4709345f65SFUJITA Tomonori struct scsi_transport_template t; 4809345f65SFUJITA Tomonori struct srp_function_template *f; 4909345f65SFUJITA Tomonori 50ee959b00STony Jones struct device_attribute *host_attrs[SRP_HOST_ATTRS + 1]; 5109345f65SFUJITA Tomonori 52ee959b00STony Jones struct device_attribute *rport_attrs[SRP_RPORT_ATTRS + 1]; 5309345f65SFUJITA Tomonori struct transport_container rport_attr_cont; 5409345f65SFUJITA Tomonori }; 5509345f65SFUJITA Tomonori 5609345f65SFUJITA Tomonori #define to_srp_internal(tmpl) container_of(tmpl, struct srp_internal, t) 5709345f65SFUJITA Tomonori 5809345f65SFUJITA Tomonori #define dev_to_rport(d) container_of(d, struct srp_rport, dev) 59ee959b00STony Jones #define transport_class_to_srp_rport(dev) dev_to_rport((dev)->parent) 6029c17324SBart Van Assche static inline struct Scsi_Host *rport_to_shost(struct srp_rport *r) 6129c17324SBart Van Assche { 6229c17324SBart Van Assche return dev_to_shost(r->dev.parent); 6329c17324SBart Van Assche } 6429c17324SBart Van Assche 6529c17324SBart Van Assche /** 6629c17324SBart Van Assche * srp_tmo_valid() - check timeout combination validity 6729c17324SBart Van Assche * 6829c17324SBart Van Assche * The combination of the timeout parameters must be such that SCSI commands 6929c17324SBart Van Assche * are finished in a reasonable time. Hence do not allow the fast I/O fail 70*18cc4e02SBart Van Assche * timeout to exceed SCSI_DEVICE_BLOCK_MAX_TIMEOUT nor allow dev_loss_tmo to 71*18cc4e02SBart Van Assche * exceed that limit if failing I/O fast has been disabled. Furthermore, these 7229c17324SBart Van Assche * parameters must be such that multipath can detect failed paths timely. 738c64e453SBart Van Assche * Hence do not allow all three parameters to be disabled simultaneously. 7429c17324SBart Van Assche */ 758c64e453SBart Van Assche int srp_tmo_valid(int reconnect_delay, int fast_io_fail_tmo, int dev_loss_tmo) 7629c17324SBart Van Assche { 778c64e453SBart Van Assche if (reconnect_delay < 0 && fast_io_fail_tmo < 0 && dev_loss_tmo < 0) 788c64e453SBart Van Assche return -EINVAL; 798c64e453SBart Van Assche if (reconnect_delay == 0) 8029c17324SBart Van Assche return -EINVAL; 8129c17324SBart Van Assche if (fast_io_fail_tmo > SCSI_DEVICE_BLOCK_MAX_TIMEOUT) 8229c17324SBart Van Assche return -EINVAL; 83*18cc4e02SBart Van Assche if (fast_io_fail_tmo < 0 && 84*18cc4e02SBart Van Assche dev_loss_tmo > SCSI_DEVICE_BLOCK_MAX_TIMEOUT) 85*18cc4e02SBart Van Assche return -EINVAL; 8629c17324SBart Van Assche if (dev_loss_tmo >= LONG_MAX / HZ) 8729c17324SBart Van Assche return -EINVAL; 8829c17324SBart Van Assche if (fast_io_fail_tmo >= 0 && dev_loss_tmo >= 0 && 8929c17324SBart Van Assche fast_io_fail_tmo >= dev_loss_tmo) 9029c17324SBart Van Assche return -EINVAL; 9129c17324SBart Van Assche return 0; 9229c17324SBart Van Assche } 9329c17324SBart Van Assche EXPORT_SYMBOL_GPL(srp_tmo_valid); 9409345f65SFUJITA Tomonori 9509345f65SFUJITA Tomonori static int srp_host_setup(struct transport_container *tc, struct device *dev, 96ee959b00STony Jones struct device *cdev) 9709345f65SFUJITA Tomonori { 9809345f65SFUJITA Tomonori struct Scsi_Host *shost = dev_to_shost(dev); 9909345f65SFUJITA Tomonori struct srp_host_attrs *srp_host = to_srp_host_attrs(shost); 10009345f65SFUJITA Tomonori 10109345f65SFUJITA Tomonori atomic_set(&srp_host->next_port_id, 0); 10209345f65SFUJITA Tomonori return 0; 10309345f65SFUJITA Tomonori } 10409345f65SFUJITA Tomonori 10509345f65SFUJITA Tomonori static DECLARE_TRANSPORT_CLASS(srp_host_class, "srp_host", srp_host_setup, 10609345f65SFUJITA Tomonori NULL, NULL); 10709345f65SFUJITA Tomonori 10809345f65SFUJITA Tomonori static DECLARE_TRANSPORT_CLASS(srp_rport_class, "srp_remote_ports", 10909345f65SFUJITA Tomonori NULL, NULL, NULL); 11009345f65SFUJITA Tomonori 11109345f65SFUJITA Tomonori #define SRP_PID(p) \ 11209345f65SFUJITA Tomonori (p)->port_id[0], (p)->port_id[1], (p)->port_id[2], (p)->port_id[3], \ 11309345f65SFUJITA Tomonori (p)->port_id[4], (p)->port_id[5], (p)->port_id[6], (p)->port_id[7], \ 11409345f65SFUJITA Tomonori (p)->port_id[8], (p)->port_id[9], (p)->port_id[10], (p)->port_id[11], \ 11509345f65SFUJITA Tomonori (p)->port_id[12], (p)->port_id[13], (p)->port_id[14], (p)->port_id[15] 11609345f65SFUJITA Tomonori 11709345f65SFUJITA Tomonori #define SRP_PID_FMT "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:" \ 11809345f65SFUJITA Tomonori "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x" 11909345f65SFUJITA Tomonori 12009345f65SFUJITA Tomonori static ssize_t 121ee959b00STony Jones show_srp_rport_id(struct device *dev, struct device_attribute *attr, 122ee959b00STony Jones char *buf) 12309345f65SFUJITA Tomonori { 124ee959b00STony Jones struct srp_rport *rport = transport_class_to_srp_rport(dev); 12509345f65SFUJITA Tomonori return sprintf(buf, SRP_PID_FMT "\n", SRP_PID(rport)); 12609345f65SFUJITA Tomonori } 12709345f65SFUJITA Tomonori 128ee959b00STony Jones static DEVICE_ATTR(port_id, S_IRUGO, show_srp_rport_id, NULL); 12909345f65SFUJITA Tomonori 130aebd5e47SFUJITA Tomonori static const struct { 131aebd5e47SFUJITA Tomonori u32 value; 132aebd5e47SFUJITA Tomonori char *name; 133aebd5e47SFUJITA Tomonori } srp_rport_role_names[] = { 134aebd5e47SFUJITA Tomonori {SRP_RPORT_ROLE_INITIATOR, "SRP Initiator"}, 135aebd5e47SFUJITA Tomonori {SRP_RPORT_ROLE_TARGET, "SRP Target"}, 136aebd5e47SFUJITA Tomonori }; 137aebd5e47SFUJITA Tomonori 138aebd5e47SFUJITA Tomonori static ssize_t 139ee959b00STony Jones show_srp_rport_roles(struct device *dev, struct device_attribute *attr, 140ee959b00STony Jones char *buf) 141aebd5e47SFUJITA Tomonori { 142ee959b00STony Jones struct srp_rport *rport = transport_class_to_srp_rport(dev); 143aebd5e47SFUJITA Tomonori int i; 144aebd5e47SFUJITA Tomonori char *name = NULL; 145aebd5e47SFUJITA Tomonori 146aebd5e47SFUJITA Tomonori for (i = 0; i < ARRAY_SIZE(srp_rport_role_names); i++) 147aebd5e47SFUJITA Tomonori if (srp_rport_role_names[i].value == rport->roles) { 148aebd5e47SFUJITA Tomonori name = srp_rport_role_names[i].name; 149aebd5e47SFUJITA Tomonori break; 150aebd5e47SFUJITA Tomonori } 151aebd5e47SFUJITA Tomonori return sprintf(buf, "%s\n", name ? : "unknown"); 152aebd5e47SFUJITA Tomonori } 153aebd5e47SFUJITA Tomonori 154ee959b00STony Jones static DEVICE_ATTR(roles, S_IRUGO, show_srp_rport_roles, NULL); 155aebd5e47SFUJITA Tomonori 156dc1bdbd9SBart Van Assche static ssize_t store_srp_rport_delete(struct device *dev, 157dc1bdbd9SBart Van Assche struct device_attribute *attr, 158dc1bdbd9SBart Van Assche const char *buf, size_t count) 159dc1bdbd9SBart Van Assche { 160dc1bdbd9SBart Van Assche struct srp_rport *rport = transport_class_to_srp_rport(dev); 161dc1bdbd9SBart Van Assche struct Scsi_Host *shost = dev_to_shost(dev); 162dc1bdbd9SBart Van Assche struct srp_internal *i = to_srp_internal(shost->transportt); 163dc1bdbd9SBart Van Assche 164dc1bdbd9SBart Van Assche if (i->f->rport_delete) { 165dc1bdbd9SBart Van Assche i->f->rport_delete(rport); 166dc1bdbd9SBart Van Assche return count; 167dc1bdbd9SBart Van Assche } else { 168dc1bdbd9SBart Van Assche return -ENOSYS; 169dc1bdbd9SBart Van Assche } 170dc1bdbd9SBart Van Assche } 171dc1bdbd9SBart Van Assche 172dc1bdbd9SBart Van Assche static DEVICE_ATTR(delete, S_IWUSR, NULL, store_srp_rport_delete); 173dc1bdbd9SBart Van Assche 17429c17324SBart Van Assche static ssize_t show_srp_rport_state(struct device *dev, 17529c17324SBart Van Assche struct device_attribute *attr, 17629c17324SBart Van Assche char *buf) 17729c17324SBart Van Assche { 17829c17324SBart Van Assche static const char *const state_name[] = { 17929c17324SBart Van Assche [SRP_RPORT_RUNNING] = "running", 18029c17324SBart Van Assche [SRP_RPORT_BLOCKED] = "blocked", 18129c17324SBart Van Assche [SRP_RPORT_FAIL_FAST] = "fail-fast", 18229c17324SBart Van Assche [SRP_RPORT_LOST] = "lost", 18329c17324SBart Van Assche }; 18429c17324SBart Van Assche struct srp_rport *rport = transport_class_to_srp_rport(dev); 18529c17324SBart Van Assche enum srp_rport_state state = rport->state; 18629c17324SBart Van Assche 18729c17324SBart Van Assche return sprintf(buf, "%s\n", 18829c17324SBart Van Assche (unsigned)state < ARRAY_SIZE(state_name) ? 18929c17324SBart Van Assche state_name[state] : "???"); 19029c17324SBart Van Assche } 19129c17324SBart Van Assche 19229c17324SBart Van Assche static DEVICE_ATTR(state, S_IRUGO, show_srp_rport_state, NULL); 19329c17324SBart Van Assche 19429c17324SBart Van Assche static ssize_t srp_show_tmo(char *buf, int tmo) 19529c17324SBart Van Assche { 19629c17324SBart Van Assche return tmo >= 0 ? sprintf(buf, "%d\n", tmo) : sprintf(buf, "off\n"); 19729c17324SBart Van Assche } 19829c17324SBart Van Assche 19929c17324SBart Van Assche static int srp_parse_tmo(int *tmo, const char *buf) 20029c17324SBart Van Assche { 20129c17324SBart Van Assche int res = 0; 20229c17324SBart Van Assche 20329c17324SBart Van Assche if (strncmp(buf, "off", 3) != 0) 20429c17324SBart Van Assche res = kstrtoint(buf, 0, tmo); 20529c17324SBart Van Assche else 20629c17324SBart Van Assche *tmo = -1; 20729c17324SBart Van Assche 20829c17324SBart Van Assche return res; 20929c17324SBart Van Assche } 21029c17324SBart Van Assche 2118c64e453SBart Van Assche static ssize_t show_reconnect_delay(struct device *dev, 2128c64e453SBart Van Assche struct device_attribute *attr, char *buf) 2138c64e453SBart Van Assche { 2148c64e453SBart Van Assche struct srp_rport *rport = transport_class_to_srp_rport(dev); 2158c64e453SBart Van Assche 2168c64e453SBart Van Assche return srp_show_tmo(buf, rport->reconnect_delay); 2178c64e453SBart Van Assche } 2188c64e453SBart Van Assche 2198c64e453SBart Van Assche static ssize_t store_reconnect_delay(struct device *dev, 2208c64e453SBart Van Assche struct device_attribute *attr, 2218c64e453SBart Van Assche const char *buf, const size_t count) 2228c64e453SBart Van Assche { 2238c64e453SBart Van Assche struct srp_rport *rport = transport_class_to_srp_rport(dev); 2248c64e453SBart Van Assche int res, delay; 2258c64e453SBart Van Assche 2268c64e453SBart Van Assche res = srp_parse_tmo(&delay, buf); 2278c64e453SBart Van Assche if (res) 2288c64e453SBart Van Assche goto out; 2298c64e453SBart Van Assche res = srp_tmo_valid(delay, rport->fast_io_fail_tmo, 2308c64e453SBart Van Assche rport->dev_loss_tmo); 2318c64e453SBart Van Assche if (res) 2328c64e453SBart Van Assche goto out; 2338c64e453SBart Van Assche 2348c64e453SBart Van Assche if (rport->reconnect_delay <= 0 && delay > 0 && 2358c64e453SBart Van Assche rport->state != SRP_RPORT_RUNNING) { 2368c64e453SBart Van Assche queue_delayed_work(system_long_wq, &rport->reconnect_work, 2378c64e453SBart Van Assche delay * HZ); 2388c64e453SBart Van Assche } else if (delay <= 0) { 2398c64e453SBart Van Assche cancel_delayed_work(&rport->reconnect_work); 2408c64e453SBart Van Assche } 2418c64e453SBart Van Assche rport->reconnect_delay = delay; 2428c64e453SBart Van Assche res = count; 2438c64e453SBart Van Assche 2448c64e453SBart Van Assche out: 2458c64e453SBart Van Assche return res; 2468c64e453SBart Van Assche } 2478c64e453SBart Van Assche 2488c64e453SBart Van Assche static DEVICE_ATTR(reconnect_delay, S_IRUGO | S_IWUSR, show_reconnect_delay, 2498c64e453SBart Van Assche store_reconnect_delay); 2508c64e453SBart Van Assche 2518c64e453SBart Van Assche static ssize_t show_failed_reconnects(struct device *dev, 2528c64e453SBart Van Assche struct device_attribute *attr, char *buf) 2538c64e453SBart Van Assche { 2548c64e453SBart Van Assche struct srp_rport *rport = transport_class_to_srp_rport(dev); 2558c64e453SBart Van Assche 2568c64e453SBart Van Assche return sprintf(buf, "%d\n", rport->failed_reconnects); 2578c64e453SBart Van Assche } 2588c64e453SBart Van Assche 2598c64e453SBart Van Assche static DEVICE_ATTR(failed_reconnects, S_IRUGO, show_failed_reconnects, NULL); 2608c64e453SBart Van Assche 26129c17324SBart Van Assche static ssize_t show_srp_rport_fast_io_fail_tmo(struct device *dev, 26229c17324SBart Van Assche struct device_attribute *attr, 26329c17324SBart Van Assche char *buf) 26429c17324SBart Van Assche { 26529c17324SBart Van Assche struct srp_rport *rport = transport_class_to_srp_rport(dev); 26629c17324SBart Van Assche 26729c17324SBart Van Assche return srp_show_tmo(buf, rport->fast_io_fail_tmo); 26829c17324SBart Van Assche } 26929c17324SBart Van Assche 27029c17324SBart Van Assche static ssize_t store_srp_rport_fast_io_fail_tmo(struct device *dev, 27129c17324SBart Van Assche struct device_attribute *attr, 27229c17324SBart Van Assche const char *buf, size_t count) 27329c17324SBart Van Assche { 27429c17324SBart Van Assche struct srp_rport *rport = transport_class_to_srp_rport(dev); 27529c17324SBart Van Assche int res; 27629c17324SBart Van Assche int fast_io_fail_tmo; 27729c17324SBart Van Assche 27829c17324SBart Van Assche res = srp_parse_tmo(&fast_io_fail_tmo, buf); 27929c17324SBart Van Assche if (res) 28029c17324SBart Van Assche goto out; 2818c64e453SBart Van Assche res = srp_tmo_valid(rport->reconnect_delay, fast_io_fail_tmo, 2828c64e453SBart Van Assche rport->dev_loss_tmo); 28329c17324SBart Van Assche if (res) 28429c17324SBart Van Assche goto out; 28529c17324SBart Van Assche rport->fast_io_fail_tmo = fast_io_fail_tmo; 28629c17324SBart Van Assche res = count; 28729c17324SBart Van Assche 28829c17324SBart Van Assche out: 28929c17324SBart Van Assche return res; 29029c17324SBart Van Assche } 29129c17324SBart Van Assche 29229c17324SBart Van Assche static DEVICE_ATTR(fast_io_fail_tmo, S_IRUGO | S_IWUSR, 29329c17324SBart Van Assche show_srp_rport_fast_io_fail_tmo, 29429c17324SBart Van Assche store_srp_rport_fast_io_fail_tmo); 29529c17324SBart Van Assche 29629c17324SBart Van Assche static ssize_t show_srp_rport_dev_loss_tmo(struct device *dev, 29729c17324SBart Van Assche struct device_attribute *attr, 29829c17324SBart Van Assche char *buf) 29929c17324SBart Van Assche { 30029c17324SBart Van Assche struct srp_rport *rport = transport_class_to_srp_rport(dev); 30129c17324SBart Van Assche 30229c17324SBart Van Assche return srp_show_tmo(buf, rport->dev_loss_tmo); 30329c17324SBart Van Assche } 30429c17324SBart Van Assche 30529c17324SBart Van Assche static ssize_t store_srp_rport_dev_loss_tmo(struct device *dev, 30629c17324SBart Van Assche struct device_attribute *attr, 30729c17324SBart Van Assche const char *buf, size_t count) 30829c17324SBart Van Assche { 30929c17324SBart Van Assche struct srp_rport *rport = transport_class_to_srp_rport(dev); 31029c17324SBart Van Assche int res; 31129c17324SBart Van Assche int dev_loss_tmo; 31229c17324SBart Van Assche 31329c17324SBart Van Assche res = srp_parse_tmo(&dev_loss_tmo, buf); 31429c17324SBart Van Assche if (res) 31529c17324SBart Van Assche goto out; 3168c64e453SBart Van Assche res = srp_tmo_valid(rport->reconnect_delay, rport->fast_io_fail_tmo, 3178c64e453SBart Van Assche dev_loss_tmo); 31829c17324SBart Van Assche if (res) 31929c17324SBart Van Assche goto out; 32029c17324SBart Van Assche rport->dev_loss_tmo = dev_loss_tmo; 32129c17324SBart Van Assche res = count; 32229c17324SBart Van Assche 32329c17324SBart Van Assche out: 32429c17324SBart Van Assche return res; 32529c17324SBart Van Assche } 32629c17324SBart Van Assche 32729c17324SBart Van Assche static DEVICE_ATTR(dev_loss_tmo, S_IRUGO | S_IWUSR, 32829c17324SBart Van Assche show_srp_rport_dev_loss_tmo, 32929c17324SBart Van Assche store_srp_rport_dev_loss_tmo); 33029c17324SBart Van Assche 33129c17324SBart Van Assche static int srp_rport_set_state(struct srp_rport *rport, 33229c17324SBart Van Assche enum srp_rport_state new_state) 33329c17324SBart Van Assche { 33429c17324SBart Van Assche enum srp_rport_state old_state = rport->state; 33529c17324SBart Van Assche 33629c17324SBart Van Assche lockdep_assert_held(&rport->mutex); 33729c17324SBart Van Assche 33829c17324SBart Van Assche switch (new_state) { 33929c17324SBart Van Assche case SRP_RPORT_RUNNING: 34029c17324SBart Van Assche switch (old_state) { 34129c17324SBart Van Assche case SRP_RPORT_LOST: 34229c17324SBart Van Assche goto invalid; 34329c17324SBart Van Assche default: 34429c17324SBart Van Assche break; 34529c17324SBart Van Assche } 34629c17324SBart Van Assche break; 34729c17324SBart Van Assche case SRP_RPORT_BLOCKED: 34829c17324SBart Van Assche switch (old_state) { 34929c17324SBart Van Assche case SRP_RPORT_RUNNING: 35029c17324SBart Van Assche break; 35129c17324SBart Van Assche default: 35229c17324SBart Van Assche goto invalid; 35329c17324SBart Van Assche } 35429c17324SBart Van Assche break; 35529c17324SBart Van Assche case SRP_RPORT_FAIL_FAST: 35629c17324SBart Van Assche switch (old_state) { 35729c17324SBart Van Assche case SRP_RPORT_LOST: 35829c17324SBart Van Assche goto invalid; 35929c17324SBart Van Assche default: 36029c17324SBart Van Assche break; 36129c17324SBart Van Assche } 36229c17324SBart Van Assche break; 36329c17324SBart Van Assche case SRP_RPORT_LOST: 36429c17324SBart Van Assche break; 36529c17324SBart Van Assche } 36629c17324SBart Van Assche rport->state = new_state; 36729c17324SBart Van Assche return 0; 36829c17324SBart Van Assche 36929c17324SBart Van Assche invalid: 37029c17324SBart Van Assche return -EINVAL; 37129c17324SBart Van Assche } 37229c17324SBart Van Assche 3738c64e453SBart Van Assche /** 3748c64e453SBart Van Assche * srp_reconnect_work() - reconnect and schedule a new attempt if necessary 3758c64e453SBart Van Assche */ 3768c64e453SBart Van Assche static void srp_reconnect_work(struct work_struct *work) 3778c64e453SBart Van Assche { 3788c64e453SBart Van Assche struct srp_rport *rport = container_of(to_delayed_work(work), 3798c64e453SBart Van Assche struct srp_rport, reconnect_work); 3808c64e453SBart Van Assche struct Scsi_Host *shost = rport_to_shost(rport); 3818c64e453SBart Van Assche int delay, res; 3828c64e453SBart Van Assche 3838c64e453SBart Van Assche res = srp_reconnect_rport(rport); 3848c64e453SBart Van Assche if (res != 0) { 3858c64e453SBart Van Assche shost_printk(KERN_ERR, shost, 3868c64e453SBart Van Assche "reconnect attempt %d failed (%d)\n", 3878c64e453SBart Van Assche ++rport->failed_reconnects, res); 3888c64e453SBart Van Assche delay = rport->reconnect_delay * 3898c64e453SBart Van Assche min(100, max(1, rport->failed_reconnects - 10)); 3908c64e453SBart Van Assche if (delay > 0) 3918c64e453SBart Van Assche queue_delayed_work(system_long_wq, 3928c64e453SBart Van Assche &rport->reconnect_work, delay * HZ); 3938c64e453SBart Van Assche } 3948c64e453SBart Van Assche } 3958c64e453SBart Van Assche 39629c17324SBart Van Assche static void __rport_fail_io_fast(struct srp_rport *rport) 39729c17324SBart Van Assche { 39829c17324SBart Van Assche struct Scsi_Host *shost = rport_to_shost(rport); 39929c17324SBart Van Assche struct srp_internal *i; 40029c17324SBart Van Assche 40129c17324SBart Van Assche lockdep_assert_held(&rport->mutex); 40229c17324SBart Van Assche 40329c17324SBart Van Assche if (srp_rport_set_state(rport, SRP_RPORT_FAIL_FAST)) 40429c17324SBart Van Assche return; 40529c17324SBart Van Assche scsi_target_unblock(rport->dev.parent, SDEV_TRANSPORT_OFFLINE); 40629c17324SBart Van Assche 40729c17324SBart Van Assche /* Involve the LLD if possible to terminate all I/O on the rport. */ 40829c17324SBart Van Assche i = to_srp_internal(shost->transportt); 40929c17324SBart Van Assche if (i->f->terminate_rport_io) 41029c17324SBart Van Assche i->f->terminate_rport_io(rport); 41129c17324SBart Van Assche } 41229c17324SBart Van Assche 41329c17324SBart Van Assche /** 41429c17324SBart Van Assche * rport_fast_io_fail_timedout() - fast I/O failure timeout handler 41529c17324SBart Van Assche */ 41629c17324SBart Van Assche static void rport_fast_io_fail_timedout(struct work_struct *work) 41729c17324SBart Van Assche { 41829c17324SBart Van Assche struct srp_rport *rport = container_of(to_delayed_work(work), 41929c17324SBart Van Assche struct srp_rport, fast_io_fail_work); 42029c17324SBart Van Assche struct Scsi_Host *shost = rport_to_shost(rport); 42129c17324SBart Van Assche 42229c17324SBart Van Assche pr_info("fast_io_fail_tmo expired for SRP %s / %s.\n", 42329c17324SBart Van Assche dev_name(&rport->dev), dev_name(&shost->shost_gendev)); 42429c17324SBart Van Assche 42529c17324SBart Van Assche mutex_lock(&rport->mutex); 42629c17324SBart Van Assche if (rport->state == SRP_RPORT_BLOCKED) 42729c17324SBart Van Assche __rport_fail_io_fast(rport); 42829c17324SBart Van Assche mutex_unlock(&rport->mutex); 42929c17324SBart Van Assche } 43029c17324SBart Van Assche 43129c17324SBart Van Assche /** 43229c17324SBart Van Assche * rport_dev_loss_timedout() - device loss timeout handler 43329c17324SBart Van Assche */ 43429c17324SBart Van Assche static void rport_dev_loss_timedout(struct work_struct *work) 43529c17324SBart Van Assche { 43629c17324SBart Van Assche struct srp_rport *rport = container_of(to_delayed_work(work), 43729c17324SBart Van Assche struct srp_rport, dev_loss_work); 43829c17324SBart Van Assche struct Scsi_Host *shost = rport_to_shost(rport); 43929c17324SBart Van Assche struct srp_internal *i = to_srp_internal(shost->transportt); 44029c17324SBart Van Assche 44129c17324SBart Van Assche pr_info("dev_loss_tmo expired for SRP %s / %s.\n", 44229c17324SBart Van Assche dev_name(&rport->dev), dev_name(&shost->shost_gendev)); 44329c17324SBart Van Assche 44429c17324SBart Van Assche mutex_lock(&rport->mutex); 44529c17324SBart Van Assche WARN_ON(srp_rport_set_state(rport, SRP_RPORT_LOST) != 0); 44629c17324SBart Van Assche scsi_target_unblock(rport->dev.parent, SDEV_TRANSPORT_OFFLINE); 44729c17324SBart Van Assche mutex_unlock(&rport->mutex); 44829c17324SBart Van Assche 44929c17324SBart Van Assche i->f->rport_delete(rport); 45029c17324SBart Van Assche } 45129c17324SBart Van Assche 45229c17324SBart Van Assche static void __srp_start_tl_fail_timers(struct srp_rport *rport) 45329c17324SBart Van Assche { 45429c17324SBart Van Assche struct Scsi_Host *shost = rport_to_shost(rport); 4558c64e453SBart Van Assche int delay, fast_io_fail_tmo, dev_loss_tmo; 45629c17324SBart Van Assche 45729c17324SBart Van Assche lockdep_assert_held(&rport->mutex); 45829c17324SBart Van Assche 45929c17324SBart Van Assche if (!rport->deleted) { 4608c64e453SBart Van Assche delay = rport->reconnect_delay; 46129c17324SBart Van Assche fast_io_fail_tmo = rport->fast_io_fail_tmo; 46229c17324SBart Van Assche dev_loss_tmo = rport->dev_loss_tmo; 46329c17324SBart Van Assche pr_debug("%s current state: %d\n", 46429c17324SBart Van Assche dev_name(&shost->shost_gendev), rport->state); 46529c17324SBart Van Assche 4668c64e453SBart Van Assche if (delay > 0) 4678c64e453SBart Van Assche queue_delayed_work(system_long_wq, 4688c64e453SBart Van Assche &rport->reconnect_work, 4698c64e453SBart Van Assche 1UL * delay * HZ); 470*18cc4e02SBart Van Assche if (srp_rport_set_state(rport, SRP_RPORT_BLOCKED) == 0) { 47129c17324SBart Van Assche pr_debug("%s new state: %d\n", 47229c17324SBart Van Assche dev_name(&shost->shost_gendev), 47329c17324SBart Van Assche rport->state); 47429c17324SBart Van Assche scsi_target_block(&shost->shost_gendev); 475*18cc4e02SBart Van Assche if (fast_io_fail_tmo >= 0) 47629c17324SBart Van Assche queue_delayed_work(system_long_wq, 47729c17324SBart Van Assche &rport->fast_io_fail_work, 47829c17324SBart Van Assche 1UL * fast_io_fail_tmo * HZ); 47929c17324SBart Van Assche if (dev_loss_tmo >= 0) 48029c17324SBart Van Assche queue_delayed_work(system_long_wq, 48129c17324SBart Van Assche &rport->dev_loss_work, 48229c17324SBart Van Assche 1UL * dev_loss_tmo * HZ); 483*18cc4e02SBart Van Assche } 48429c17324SBart Van Assche } else { 48529c17324SBart Van Assche pr_debug("%s has already been deleted\n", 48629c17324SBart Van Assche dev_name(&shost->shost_gendev)); 48729c17324SBart Van Assche srp_rport_set_state(rport, SRP_RPORT_FAIL_FAST); 48829c17324SBart Van Assche scsi_target_unblock(&shost->shost_gendev, 48929c17324SBart Van Assche SDEV_TRANSPORT_OFFLINE); 49029c17324SBart Van Assche } 49129c17324SBart Van Assche } 49229c17324SBart Van Assche 49329c17324SBart Van Assche /** 49429c17324SBart Van Assche * srp_start_tl_fail_timers() - start the transport layer failure timers 49529c17324SBart Van Assche * 49629c17324SBart Van Assche * Start the transport layer fast I/O failure and device loss timers. Do not 49729c17324SBart Van Assche * modify a timer that was already started. 49829c17324SBart Van Assche */ 49929c17324SBart Van Assche void srp_start_tl_fail_timers(struct srp_rport *rport) 50029c17324SBart Van Assche { 50129c17324SBart Van Assche mutex_lock(&rport->mutex); 50229c17324SBart Van Assche __srp_start_tl_fail_timers(rport); 50329c17324SBart Van Assche mutex_unlock(&rport->mutex); 50429c17324SBart Van Assche } 50529c17324SBart Van Assche EXPORT_SYMBOL(srp_start_tl_fail_timers); 50629c17324SBart Van Assche 50729c17324SBart Van Assche /** 50829c17324SBart Van Assche * scsi_request_fn_active() - number of kernel threads inside scsi_request_fn() 50929c17324SBart Van Assche */ 51029c17324SBart Van Assche static int scsi_request_fn_active(struct Scsi_Host *shost) 51129c17324SBart Van Assche { 51229c17324SBart Van Assche struct scsi_device *sdev; 51329c17324SBart Van Assche struct request_queue *q; 51429c17324SBart Van Assche int request_fn_active = 0; 51529c17324SBart Van Assche 51629c17324SBart Van Assche shost_for_each_device(sdev, shost) { 51729c17324SBart Van Assche q = sdev->request_queue; 51829c17324SBart Van Assche 51929c17324SBart Van Assche spin_lock_irq(q->queue_lock); 52029c17324SBart Van Assche request_fn_active += q->request_fn_active; 52129c17324SBart Van Assche spin_unlock_irq(q->queue_lock); 52229c17324SBart Van Assche } 52329c17324SBart Van Assche 52429c17324SBart Van Assche return request_fn_active; 52529c17324SBart Van Assche } 52629c17324SBart Van Assche 52729c17324SBart Van Assche /** 52829c17324SBart Van Assche * srp_reconnect_rport() - reconnect to an SRP target port 52929c17324SBart Van Assche * 53029c17324SBart Van Assche * Blocks SCSI command queueing before invoking reconnect() such that 53129c17324SBart Van Assche * queuecommand() won't be invoked concurrently with reconnect() from outside 53229c17324SBart Van Assche * the SCSI EH. This is important since a reconnect() implementation may 53329c17324SBart Van Assche * reallocate resources needed by queuecommand(). 53429c17324SBart Van Assche * 53529c17324SBart Van Assche * Notes: 53629c17324SBart Van Assche * - This function neither waits until outstanding requests have finished nor 53729c17324SBart Van Assche * tries to abort these. It is the responsibility of the reconnect() 53829c17324SBart Van Assche * function to finish outstanding commands before reconnecting to the target 53929c17324SBart Van Assche * port. 54029c17324SBart Van Assche * - It is the responsibility of the caller to ensure that the resources 54129c17324SBart Van Assche * reallocated by the reconnect() function won't be used while this function 54229c17324SBart Van Assche * is in progress. One possible strategy is to invoke this function from 54329c17324SBart Van Assche * the context of the SCSI EH thread only. Another possible strategy is to 54429c17324SBart Van Assche * lock the rport mutex inside each SCSI LLD callback that can be invoked by 54529c17324SBart Van Assche * the SCSI EH (the scsi_host_template.eh_*() functions and also the 54629c17324SBart Van Assche * scsi_host_template.queuecommand() function). 54729c17324SBart Van Assche */ 54829c17324SBart Van Assche int srp_reconnect_rport(struct srp_rport *rport) 54929c17324SBart Van Assche { 55029c17324SBart Van Assche struct Scsi_Host *shost = rport_to_shost(rport); 55129c17324SBart Van Assche struct srp_internal *i = to_srp_internal(shost->transportt); 55229c17324SBart Van Assche struct scsi_device *sdev; 55329c17324SBart Van Assche int res; 55429c17324SBart Van Assche 55529c17324SBart Van Assche pr_debug("SCSI host %s\n", dev_name(&shost->shost_gendev)); 55629c17324SBart Van Assche 55729c17324SBart Van Assche res = mutex_lock_interruptible(&rport->mutex); 55829c17324SBart Van Assche if (res) 55929c17324SBart Van Assche goto out; 56029c17324SBart Van Assche scsi_target_block(&shost->shost_gendev); 56129c17324SBart Van Assche while (scsi_request_fn_active(shost)) 56229c17324SBart Van Assche msleep(20); 56329c17324SBart Van Assche res = i->f->reconnect(rport); 56429c17324SBart Van Assche pr_debug("%s (state %d): transport.reconnect() returned %d\n", 56529c17324SBart Van Assche dev_name(&shost->shost_gendev), rport->state, res); 56629c17324SBart Van Assche if (res == 0) { 56729c17324SBart Van Assche cancel_delayed_work(&rport->fast_io_fail_work); 56829c17324SBart Van Assche cancel_delayed_work(&rport->dev_loss_work); 56929c17324SBart Van Assche 5708c64e453SBart Van Assche rport->failed_reconnects = 0; 57129c17324SBart Van Assche srp_rport_set_state(rport, SRP_RPORT_RUNNING); 57229c17324SBart Van Assche scsi_target_unblock(&shost->shost_gendev, SDEV_RUNNING); 57329c17324SBart Van Assche /* 57429c17324SBart Van Assche * If the SCSI error handler has offlined one or more devices, 57529c17324SBart Van Assche * invoking scsi_target_unblock() won't change the state of 57629c17324SBart Van Assche * these devices into running so do that explicitly. 57729c17324SBart Van Assche */ 57829c17324SBart Van Assche spin_lock_irq(shost->host_lock); 57929c17324SBart Van Assche __shost_for_each_device(sdev, shost) 58029c17324SBart Van Assche if (sdev->sdev_state == SDEV_OFFLINE) 58129c17324SBart Van Assche sdev->sdev_state = SDEV_RUNNING; 58229c17324SBart Van Assche spin_unlock_irq(shost->host_lock); 58329c17324SBart Van Assche } else if (rport->state == SRP_RPORT_RUNNING) { 58429c17324SBart Van Assche /* 585*18cc4e02SBart Van Assche * srp_reconnect_rport() has been invoked with fast_io_fail 586*18cc4e02SBart Van Assche * and dev_loss off. Mark the port as failed and start the TL 587*18cc4e02SBart Van Assche * failure timers if these had not yet been started. 58829c17324SBart Van Assche */ 58929c17324SBart Van Assche __rport_fail_io_fast(rport); 59029c17324SBart Van Assche scsi_target_unblock(&shost->shost_gendev, 59129c17324SBart Van Assche SDEV_TRANSPORT_OFFLINE); 59229c17324SBart Van Assche __srp_start_tl_fail_timers(rport); 59329c17324SBart Van Assche } else if (rport->state != SRP_RPORT_BLOCKED) { 59429c17324SBart Van Assche scsi_target_unblock(&shost->shost_gendev, 59529c17324SBart Van Assche SDEV_TRANSPORT_OFFLINE); 59629c17324SBart Van Assche } 59729c17324SBart Van Assche mutex_unlock(&rport->mutex); 59829c17324SBart Van Assche 59929c17324SBart Van Assche out: 60029c17324SBart Van Assche return res; 60129c17324SBart Van Assche } 60229c17324SBart Van Assche EXPORT_SYMBOL(srp_reconnect_rport); 60329c17324SBart Van Assche 60429c17324SBart Van Assche /** 60529c17324SBart Van Assche * srp_timed_out() - SRP transport intercept of the SCSI timeout EH 60629c17324SBart Van Assche * 60729c17324SBart Van Assche * If a timeout occurs while an rport is in the blocked state, ask the SCSI 60829c17324SBart Van Assche * EH to continue waiting (BLK_EH_RESET_TIMER). Otherwise let the SCSI core 60929c17324SBart Van Assche * handle the timeout (BLK_EH_NOT_HANDLED). 61029c17324SBart Van Assche * 61129c17324SBart Van Assche * Note: This function is called from soft-IRQ context and with the request 61229c17324SBart Van Assche * queue lock held. 61329c17324SBart Van Assche */ 61429c17324SBart Van Assche static enum blk_eh_timer_return srp_timed_out(struct scsi_cmnd *scmd) 61529c17324SBart Van Assche { 61629c17324SBart Van Assche struct scsi_device *sdev = scmd->device; 61729c17324SBart Van Assche struct Scsi_Host *shost = sdev->host; 61829c17324SBart Van Assche struct srp_internal *i = to_srp_internal(shost->transportt); 61929c17324SBart Van Assche 62029c17324SBart Van Assche pr_debug("timeout for sdev %s\n", dev_name(&sdev->sdev_gendev)); 62129c17324SBart Van Assche return i->f->reset_timer_if_blocked && scsi_device_blocked(sdev) ? 62229c17324SBart Van Assche BLK_EH_RESET_TIMER : BLK_EH_NOT_HANDLED; 62329c17324SBart Van Assche } 62429c17324SBart Van Assche 62509345f65SFUJITA Tomonori static void srp_rport_release(struct device *dev) 62609345f65SFUJITA Tomonori { 62709345f65SFUJITA Tomonori struct srp_rport *rport = dev_to_rport(dev); 62809345f65SFUJITA Tomonori 6298c64e453SBart Van Assche cancel_delayed_work_sync(&rport->reconnect_work); 63029c17324SBart Van Assche cancel_delayed_work_sync(&rport->fast_io_fail_work); 63129c17324SBart Van Assche cancel_delayed_work_sync(&rport->dev_loss_work); 63229c17324SBart Van Assche 63309345f65SFUJITA Tomonori put_device(dev->parent); 63409345f65SFUJITA Tomonori kfree(rport); 63509345f65SFUJITA Tomonori } 63609345f65SFUJITA Tomonori 63709345f65SFUJITA Tomonori static int scsi_is_srp_rport(const struct device *dev) 63809345f65SFUJITA Tomonori { 63909345f65SFUJITA Tomonori return dev->release == srp_rport_release; 64009345f65SFUJITA Tomonori } 64109345f65SFUJITA Tomonori 64209345f65SFUJITA Tomonori static int srp_rport_match(struct attribute_container *cont, 64309345f65SFUJITA Tomonori struct device *dev) 64409345f65SFUJITA Tomonori { 64509345f65SFUJITA Tomonori struct Scsi_Host *shost; 64609345f65SFUJITA Tomonori struct srp_internal *i; 64709345f65SFUJITA Tomonori 64809345f65SFUJITA Tomonori if (!scsi_is_srp_rport(dev)) 64909345f65SFUJITA Tomonori return 0; 65009345f65SFUJITA Tomonori 65109345f65SFUJITA Tomonori shost = dev_to_shost(dev->parent); 65209345f65SFUJITA Tomonori if (!shost->transportt) 65309345f65SFUJITA Tomonori return 0; 65409345f65SFUJITA Tomonori if (shost->transportt->host_attrs.ac.class != &srp_host_class.class) 65509345f65SFUJITA Tomonori return 0; 65609345f65SFUJITA Tomonori 65709345f65SFUJITA Tomonori i = to_srp_internal(shost->transportt); 65809345f65SFUJITA Tomonori return &i->rport_attr_cont.ac == cont; 65909345f65SFUJITA Tomonori } 66009345f65SFUJITA Tomonori 66109345f65SFUJITA Tomonori static int srp_host_match(struct attribute_container *cont, struct device *dev) 66209345f65SFUJITA Tomonori { 66309345f65SFUJITA Tomonori struct Scsi_Host *shost; 66409345f65SFUJITA Tomonori struct srp_internal *i; 66509345f65SFUJITA Tomonori 66609345f65SFUJITA Tomonori if (!scsi_is_host_device(dev)) 66709345f65SFUJITA Tomonori return 0; 66809345f65SFUJITA Tomonori 66909345f65SFUJITA Tomonori shost = dev_to_shost(dev); 67009345f65SFUJITA Tomonori if (!shost->transportt) 67109345f65SFUJITA Tomonori return 0; 67209345f65SFUJITA Tomonori if (shost->transportt->host_attrs.ac.class != &srp_host_class.class) 67309345f65SFUJITA Tomonori return 0; 67409345f65SFUJITA Tomonori 67509345f65SFUJITA Tomonori i = to_srp_internal(shost->transportt); 67609345f65SFUJITA Tomonori return &i->t.host_attrs.ac == cont; 67709345f65SFUJITA Tomonori } 67809345f65SFUJITA Tomonori 67909345f65SFUJITA Tomonori /** 6809dd69a60SBart Van Assche * srp_rport_get() - increment rport reference count 6819dd69a60SBart Van Assche */ 6829dd69a60SBart Van Assche void srp_rport_get(struct srp_rport *rport) 6839dd69a60SBart Van Assche { 6849dd69a60SBart Van Assche get_device(&rport->dev); 6859dd69a60SBart Van Assche } 6869dd69a60SBart Van Assche EXPORT_SYMBOL(srp_rport_get); 6879dd69a60SBart Van Assche 6889dd69a60SBart Van Assche /** 6899dd69a60SBart Van Assche * srp_rport_put() - decrement rport reference count 6909dd69a60SBart Van Assche */ 6919dd69a60SBart Van Assche void srp_rport_put(struct srp_rport *rport) 6929dd69a60SBart Van Assche { 6939dd69a60SBart Van Assche put_device(&rport->dev); 6949dd69a60SBart Van Assche } 6959dd69a60SBart Van Assche EXPORT_SYMBOL(srp_rport_put); 6969dd69a60SBart Van Assche 6979dd69a60SBart Van Assche /** 69809345f65SFUJITA Tomonori * srp_rport_add - add a SRP remote port to the device hierarchy 69909345f65SFUJITA Tomonori * @shost: scsi host the remote port is connected to. 70009345f65SFUJITA Tomonori * @ids: The port id for the remote port. 70109345f65SFUJITA Tomonori * 702dc8875e1SRandy Dunlap * Publishes a port to the rest of the system. 70309345f65SFUJITA Tomonori */ 70409345f65SFUJITA Tomonori struct srp_rport *srp_rport_add(struct Scsi_Host *shost, 70509345f65SFUJITA Tomonori struct srp_rport_identifiers *ids) 70609345f65SFUJITA Tomonori { 70709345f65SFUJITA Tomonori struct srp_rport *rport; 70809345f65SFUJITA Tomonori struct device *parent = &shost->shost_gendev; 70929c17324SBart Van Assche struct srp_internal *i = to_srp_internal(shost->transportt); 71009345f65SFUJITA Tomonori int id, ret; 71109345f65SFUJITA Tomonori 71209345f65SFUJITA Tomonori rport = kzalloc(sizeof(*rport), GFP_KERNEL); 71309345f65SFUJITA Tomonori if (!rport) 71409345f65SFUJITA Tomonori return ERR_PTR(-ENOMEM); 71509345f65SFUJITA Tomonori 71629c17324SBart Van Assche mutex_init(&rport->mutex); 71729c17324SBart Van Assche 71809345f65SFUJITA Tomonori device_initialize(&rport->dev); 71909345f65SFUJITA Tomonori 72009345f65SFUJITA Tomonori rport->dev.parent = get_device(parent); 72109345f65SFUJITA Tomonori rport->dev.release = srp_rport_release; 72209345f65SFUJITA Tomonori 72309345f65SFUJITA Tomonori memcpy(rport->port_id, ids->port_id, sizeof(rport->port_id)); 724aebd5e47SFUJITA Tomonori rport->roles = ids->roles; 72509345f65SFUJITA Tomonori 7268c64e453SBart Van Assche if (i->f->reconnect) 7278c64e453SBart Van Assche rport->reconnect_delay = i->f->reconnect_delay ? 7288c64e453SBart Van Assche *i->f->reconnect_delay : 10; 7298c64e453SBart Van Assche INIT_DELAYED_WORK(&rport->reconnect_work, srp_reconnect_work); 73029c17324SBart Van Assche rport->fast_io_fail_tmo = i->f->fast_io_fail_tmo ? 73129c17324SBart Van Assche *i->f->fast_io_fail_tmo : 15; 73229c17324SBart Van Assche rport->dev_loss_tmo = i->f->dev_loss_tmo ? *i->f->dev_loss_tmo : 60; 73329c17324SBart Van Assche INIT_DELAYED_WORK(&rport->fast_io_fail_work, 73429c17324SBart Van Assche rport_fast_io_fail_timedout); 73529c17324SBart Van Assche INIT_DELAYED_WORK(&rport->dev_loss_work, rport_dev_loss_timedout); 73629c17324SBart Van Assche 73709345f65SFUJITA Tomonori id = atomic_inc_return(&to_srp_host_attrs(shost)->next_port_id); 73871610f55SKay Sievers dev_set_name(&rport->dev, "port-%d:%d", shost->host_no, id); 73909345f65SFUJITA Tomonori 74009345f65SFUJITA Tomonori transport_setup_device(&rport->dev); 74109345f65SFUJITA Tomonori 74209345f65SFUJITA Tomonori ret = device_add(&rport->dev); 74309345f65SFUJITA Tomonori if (ret) { 74409345f65SFUJITA Tomonori transport_destroy_device(&rport->dev); 74509345f65SFUJITA Tomonori put_device(&rport->dev); 74609345f65SFUJITA Tomonori return ERR_PTR(ret); 74709345f65SFUJITA Tomonori } 74809345f65SFUJITA Tomonori 74972e39ea7SFUJITA Tomonori if (shost->active_mode & MODE_TARGET && 75072e39ea7SFUJITA Tomonori ids->roles == SRP_RPORT_ROLE_INITIATOR) { 7510012fdf9SFUJITA Tomonori ret = srp_tgt_it_nexus_create(shost, (unsigned long)rport, 75262fe8826SFUJITA Tomonori rport->port_id); 75362fe8826SFUJITA Tomonori if (ret) { 75462fe8826SFUJITA Tomonori device_del(&rport->dev); 75562fe8826SFUJITA Tomonori transport_destroy_device(&rport->dev); 75662fe8826SFUJITA Tomonori put_device(&rport->dev); 75762fe8826SFUJITA Tomonori return ERR_PTR(ret); 75862fe8826SFUJITA Tomonori } 75962fe8826SFUJITA Tomonori } 76062fe8826SFUJITA Tomonori 76109345f65SFUJITA Tomonori transport_add_device(&rport->dev); 76209345f65SFUJITA Tomonori transport_configure_device(&rport->dev); 76309345f65SFUJITA Tomonori 76409345f65SFUJITA Tomonori return rport; 76509345f65SFUJITA Tomonori } 76609345f65SFUJITA Tomonori EXPORT_SYMBOL_GPL(srp_rport_add); 76709345f65SFUJITA Tomonori 76809345f65SFUJITA Tomonori /** 769eb44820cSRob Landley * srp_rport_del - remove a SRP remote port 770eb44820cSRob Landley * @rport: SRP remote port to remove 77109345f65SFUJITA Tomonori * 77209345f65SFUJITA Tomonori * Removes the specified SRP remote port. 77309345f65SFUJITA Tomonori */ 77409345f65SFUJITA Tomonori void srp_rport_del(struct srp_rport *rport) 77509345f65SFUJITA Tomonori { 77609345f65SFUJITA Tomonori struct device *dev = &rport->dev; 77772e39ea7SFUJITA Tomonori struct Scsi_Host *shost = dev_to_shost(dev->parent); 77809345f65SFUJITA Tomonori 77972e39ea7SFUJITA Tomonori if (shost->active_mode & MODE_TARGET && 78072e39ea7SFUJITA Tomonori rport->roles == SRP_RPORT_ROLE_INITIATOR) 78172e39ea7SFUJITA Tomonori srp_tgt_it_nexus_destroy(shost, (unsigned long)rport); 78262fe8826SFUJITA Tomonori 78309345f65SFUJITA Tomonori transport_remove_device(dev); 78409345f65SFUJITA Tomonori device_del(dev); 78509345f65SFUJITA Tomonori transport_destroy_device(dev); 78629c17324SBart Van Assche 78729c17324SBart Van Assche mutex_lock(&rport->mutex); 78829c17324SBart Van Assche if (rport->state == SRP_RPORT_BLOCKED) 78929c17324SBart Van Assche __rport_fail_io_fast(rport); 79029c17324SBart Van Assche rport->deleted = true; 79129c17324SBart Van Assche mutex_unlock(&rport->mutex); 79229c17324SBart Van Assche 79309345f65SFUJITA Tomonori put_device(dev); 79409345f65SFUJITA Tomonori } 79509345f65SFUJITA Tomonori EXPORT_SYMBOL_GPL(srp_rport_del); 79609345f65SFUJITA Tomonori 79709345f65SFUJITA Tomonori static int do_srp_rport_del(struct device *dev, void *data) 79809345f65SFUJITA Tomonori { 79991183344SDave Dillow if (scsi_is_srp_rport(dev)) 80009345f65SFUJITA Tomonori srp_rport_del(dev_to_rport(dev)); 80109345f65SFUJITA Tomonori return 0; 80209345f65SFUJITA Tomonori } 80309345f65SFUJITA Tomonori 80409345f65SFUJITA Tomonori /** 805eb44820cSRob Landley * srp_remove_host - tear down a Scsi_Host's SRP data structures 80609345f65SFUJITA Tomonori * @shost: Scsi Host that is torn down 80709345f65SFUJITA Tomonori * 80809345f65SFUJITA Tomonori * Removes all SRP remote ports for a given Scsi_Host. 80909345f65SFUJITA Tomonori * Must be called just before scsi_remove_host for SRP HBAs. 81009345f65SFUJITA Tomonori */ 81109345f65SFUJITA Tomonori void srp_remove_host(struct Scsi_Host *shost) 81209345f65SFUJITA Tomonori { 81309345f65SFUJITA Tomonori device_for_each_child(&shost->shost_gendev, NULL, do_srp_rport_del); 81409345f65SFUJITA Tomonori } 81509345f65SFUJITA Tomonori EXPORT_SYMBOL_GPL(srp_remove_host); 81609345f65SFUJITA Tomonori 817bfb74374SFUJITA Tomonori static int srp_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id, 818bfb74374SFUJITA Tomonori int result) 81962fe8826SFUJITA Tomonori { 82062fe8826SFUJITA Tomonori struct srp_internal *i = to_srp_internal(shost->transportt); 821bfb74374SFUJITA Tomonori return i->f->tsk_mgmt_response(shost, nexus, tm_id, result); 822bfb74374SFUJITA Tomonori } 823bfb74374SFUJITA Tomonori 824bfb74374SFUJITA Tomonori static int srp_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result) 825bfb74374SFUJITA Tomonori { 826bfb74374SFUJITA Tomonori struct srp_internal *i = to_srp_internal(shost->transportt); 827bfb74374SFUJITA Tomonori return i->f->it_nexus_response(shost, nexus, result); 82862fe8826SFUJITA Tomonori } 82962fe8826SFUJITA Tomonori 83009345f65SFUJITA Tomonori /** 831eb44820cSRob Landley * srp_attach_transport - instantiate SRP transport template 83209345f65SFUJITA Tomonori * @ft: SRP transport class function template 83309345f65SFUJITA Tomonori */ 83409345f65SFUJITA Tomonori struct scsi_transport_template * 83509345f65SFUJITA Tomonori srp_attach_transport(struct srp_function_template *ft) 83609345f65SFUJITA Tomonori { 83709345f65SFUJITA Tomonori int count; 83809345f65SFUJITA Tomonori struct srp_internal *i; 83909345f65SFUJITA Tomonori 84009345f65SFUJITA Tomonori i = kzalloc(sizeof(*i), GFP_KERNEL); 84109345f65SFUJITA Tomonori if (!i) 84209345f65SFUJITA Tomonori return NULL; 84309345f65SFUJITA Tomonori 84429c17324SBart Van Assche i->t.eh_timed_out = srp_timed_out; 84529c17324SBart Van Assche 846bfb74374SFUJITA Tomonori i->t.tsk_mgmt_response = srp_tsk_mgmt_response; 84762fe8826SFUJITA Tomonori i->t.it_nexus_response = srp_it_nexus_response; 84862fe8826SFUJITA Tomonori 84909345f65SFUJITA Tomonori i->t.host_size = sizeof(struct srp_host_attrs); 85009345f65SFUJITA Tomonori i->t.host_attrs.ac.attrs = &i->host_attrs[0]; 85109345f65SFUJITA Tomonori i->t.host_attrs.ac.class = &srp_host_class.class; 85209345f65SFUJITA Tomonori i->t.host_attrs.ac.match = srp_host_match; 85309345f65SFUJITA Tomonori i->host_attrs[0] = NULL; 85409345f65SFUJITA Tomonori transport_container_register(&i->t.host_attrs); 85509345f65SFUJITA Tomonori 85609345f65SFUJITA Tomonori i->rport_attr_cont.ac.attrs = &i->rport_attrs[0]; 85709345f65SFUJITA Tomonori i->rport_attr_cont.ac.class = &srp_rport_class.class; 85809345f65SFUJITA Tomonori i->rport_attr_cont.ac.match = srp_rport_match; 85909345f65SFUJITA Tomonori 86009345f65SFUJITA Tomonori count = 0; 8619134a855SBart Van Assche i->rport_attrs[count++] = &dev_attr_port_id; 8629134a855SBart Van Assche i->rport_attrs[count++] = &dev_attr_roles; 86329c17324SBart Van Assche if (ft->has_rport_state) { 86429c17324SBart Van Assche i->rport_attrs[count++] = &dev_attr_state; 86529c17324SBart Van Assche i->rport_attrs[count++] = &dev_attr_fast_io_fail_tmo; 86629c17324SBart Van Assche i->rport_attrs[count++] = &dev_attr_dev_loss_tmo; 86729c17324SBart Van Assche } 8688c64e453SBart Van Assche if (ft->reconnect) { 8698c64e453SBart Van Assche i->rport_attrs[count++] = &dev_attr_reconnect_delay; 8708c64e453SBart Van Assche i->rport_attrs[count++] = &dev_attr_failed_reconnects; 8718c64e453SBart Van Assche } 872dc1bdbd9SBart Van Assche if (ft->rport_delete) 873dc1bdbd9SBart Van Assche i->rport_attrs[count++] = &dev_attr_delete; 8749134a855SBart Van Assche i->rport_attrs[count++] = NULL; 8759134a855SBart Van Assche BUG_ON(count > ARRAY_SIZE(i->rport_attrs)); 87609345f65SFUJITA Tomonori 877ac9be30eSBart Van Assche transport_container_register(&i->rport_attr_cont); 878ac9be30eSBart Van Assche 87909345f65SFUJITA Tomonori i->f = ft; 88009345f65SFUJITA Tomonori 88109345f65SFUJITA Tomonori return &i->t; 88209345f65SFUJITA Tomonori } 88309345f65SFUJITA Tomonori EXPORT_SYMBOL_GPL(srp_attach_transport); 88409345f65SFUJITA Tomonori 88509345f65SFUJITA Tomonori /** 886eb44820cSRob Landley * srp_release_transport - release SRP transport template instance 88709345f65SFUJITA Tomonori * @t: transport template instance 88809345f65SFUJITA Tomonori */ 88909345f65SFUJITA Tomonori void srp_release_transport(struct scsi_transport_template *t) 89009345f65SFUJITA Tomonori { 89109345f65SFUJITA Tomonori struct srp_internal *i = to_srp_internal(t); 89209345f65SFUJITA Tomonori 89309345f65SFUJITA Tomonori transport_container_unregister(&i->t.host_attrs); 89409345f65SFUJITA Tomonori transport_container_unregister(&i->rport_attr_cont); 89509345f65SFUJITA Tomonori 89609345f65SFUJITA Tomonori kfree(i); 89709345f65SFUJITA Tomonori } 89809345f65SFUJITA Tomonori EXPORT_SYMBOL_GPL(srp_release_transport); 89909345f65SFUJITA Tomonori 90009345f65SFUJITA Tomonori static __init int srp_transport_init(void) 90109345f65SFUJITA Tomonori { 90209345f65SFUJITA Tomonori int ret; 90309345f65SFUJITA Tomonori 90409345f65SFUJITA Tomonori ret = transport_class_register(&srp_host_class); 90509345f65SFUJITA Tomonori if (ret) 90609345f65SFUJITA Tomonori return ret; 90709345f65SFUJITA Tomonori ret = transport_class_register(&srp_rport_class); 90809345f65SFUJITA Tomonori if (ret) 90909345f65SFUJITA Tomonori goto unregister_host_class; 91009345f65SFUJITA Tomonori 91109345f65SFUJITA Tomonori return 0; 91209345f65SFUJITA Tomonori unregister_host_class: 91309345f65SFUJITA Tomonori transport_class_unregister(&srp_host_class); 91409345f65SFUJITA Tomonori return ret; 91509345f65SFUJITA Tomonori } 91609345f65SFUJITA Tomonori 91709345f65SFUJITA Tomonori static void __exit srp_transport_exit(void) 91809345f65SFUJITA Tomonori { 91909345f65SFUJITA Tomonori transport_class_unregister(&srp_host_class); 92009345f65SFUJITA Tomonori transport_class_unregister(&srp_rport_class); 92109345f65SFUJITA Tomonori } 92209345f65SFUJITA Tomonori 92309345f65SFUJITA Tomonori MODULE_AUTHOR("FUJITA Tomonori"); 92409345f65SFUJITA Tomonori MODULE_DESCRIPTION("SRP Transport Attributes"); 92509345f65SFUJITA Tomonori MODULE_LICENSE("GPL"); 92609345f65SFUJITA Tomonori 92709345f65SFUJITA Tomonori module_init(srp_transport_init); 92809345f65SFUJITA Tomonori module_exit(srp_transport_exit); 929