[PATCH 04/28] IB/srp: Add RDMA/CM support

Bart Van Assche
2018-01-03T21:39:14Z

Since the SRP_LOGIN_REQ defined in the SRP standard is larger than
what fits in the RDMA/CM login request private data, introduce a new
login request format for the RDMA/CM. Add a kernel module parameter
to the ib_srp kernel driver that allows to specify the port on which
to listen for RDMA/CM connections. The default value for this kernel
module parameter is 0, which means not to listen for RDMA/CM
connections.

Signed-off-by: Bart Van Assche <bart.vanassche-Sjgp3cTcYWE@public.gmane.org>
---
drivers/infiniband/ulp/srp/ib_srp.c | 683 ++++++++++++++++++++++++++++--------
drivers/infiniband/ulp/srp/ib_srp.h | 41 ++-
include/scsi/srp.h | 17 +
3 files changed, 590 insertions(+), 151 deletions(-)

diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 9472f5989d27..6f59bf715a0d 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -41,6 +41,7 @@
#include <linux/random.h>
#include <linux/jiffies.h>
#include <linux/lockdep.h>
+#include <linux/inet.h>
#include <rdma/ib_cache.h>

#include <linux/atomic.h>
@@ -144,7 +145,9 @@ static void srp_remove_one(struct ib_device *device, void *client_data);
static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc);
static void srp_handle_qp_err(struct ib_cq *cq, struct ib_wc *wc,
const char *opname);
-static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
+static int srp_ib_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
+static int srp_rdma_cm_handler(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event);

static struct scsi_transport_template *ib_srp_transport_template;
static struct workqueue_struct *srp_remove_wq;
@@ -265,8 +268,8 @@ static void srp_qp_event(struct ib_event *event, void *context)
ib_event_msg(event->event), event->event);
}

-static int srp_init_qp(struct srp_target_port *target,
- struct ib_qp *qp)
+static int srp_init_ib_qp(struct srp_target_port *target,
+ struct ib_qp *qp)
{
struct ib_qp_attr *attr;
int ret;
@@ -277,7 +280,7 @@ static int srp_init_qp(struct srp_target_port *target,

ret = ib_find_cached_pkey(target->srp_host->srp_dev->dev,
target->srp_host->port,
- be16_to_cpu(target->pkey),
+ be16_to_cpu(target->ib_cm.pkey),
&attr->pkey_index);
if (ret)
goto out;
@@ -298,32 +301,110 @@ static int srp_init_qp(struct srp_target_port *target,
return ret;
}

-static int srp_new_cm_id(struct srp_rdma_ch *ch)
+static int srp_new_ib_cm_id(struct srp_rdma_ch *ch)
{
struct srp_target_port *target = ch->target;
struct ib_cm_id *new_cm_id;

new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
- srp_cm_handler, ch);
+ srp_ib_cm_handler, ch);
if (IS_ERR(new_cm_id))
return PTR_ERR(new_cm_id);

- if (ch->cm_id)
- ib_destroy_cm_id(ch->cm_id);
- ch->cm_id = new_cm_id;
+ if (ch->ib_cm.cm_id)
+ ib_destroy_cm_id(ch->ib_cm.cm_id);
+ ch->ib_cm.cm_id = new_cm_id;
if (rdma_cap_opa_ah(target->srp_host->srp_dev->dev,
target->srp_host->port))
- ch->path.rec_type = SA_PATH_REC_TYPE_OPA;
+ ch->ib_cm.path.rec_type = SA_PATH_REC_TYPE_OPA;
else
- ch->path.rec_type = SA_PATH_REC_TYPE_IB;
- ch->path.sgid = target->sgid;
- ch->path.dgid = target->orig_dgid;
- ch->path.pkey = target->pkey;
- ch->path.service_id = target->service_id;
+ ch->ib_cm.path.rec_type = SA_PATH_REC_TYPE_IB;
+ ch->ib_cm.path.sgid = target->sgid;
+ ch->ib_cm.path.dgid = target->ib_cm.orig_dgid;
+ ch->ib_cm.path.pkey = target->ib_cm.pkey;
+ ch->ib_cm.path.service_id = target->ib_cm.service_id;

return 0;
}

+static const char *inet_ntop(const void *sa, char *dst, unsigned int size)
+{
+ switch (((struct sockaddr *)sa)->sa_family) {
+ case AF_INET:
+ snprintf(dst, size, "%pI4",
+ &((struct sockaddr_in *)sa)->sin_addr);
+ break;
+ case AF_INET6:
+ snprintf(dst, size, "%pI6",
+ &((struct sockaddr_in6 *)sa)->sin6_addr);
+ break;
+ default:
+ snprintf(dst, size, "???");
+ break;
+ }
+ return dst;
+}
+
+static int srp_new_rdma_cm_id(struct srp_rdma_ch *ch)
+{
+ struct srp_target_port *target = ch->target;
+ struct rdma_cm_id *new_cm_id;
+ char src_addr[64], dst_addr[64];
+ int ret;
+
+ new_cm_id = rdma_create_id(&init_net, srp_rdma_cm_handler, ch,
+ RDMA_PS_TCP, IB_QPT_RC);
+ if (IS_ERR(new_cm_id)) {
+ ret = PTR_ERR(new_cm_id);
+ new_cm_id = NULL;
+ goto out;
+ }
+
+ init_completion(&ch->done);
+ ret = rdma_resolve_addr(new_cm_id, target->rdma_cm.src_specified ?
+ (struct sockaddr *)&target->rdma_cm.src : NULL,
+ (struct sockaddr *)&target->rdma_cm.dst,
+ SRP_PATH_REC_TIMEOUT_MS);
+ if (ret) {
+ pr_err("No route available from %s to %s (%d)\n",
+ target->rdma_cm.src_specified ?
+ inet_ntop(&target->rdma_cm.src, src_addr,
+ sizeof(src_addr)) : "(any)",
+ inet_ntop(&target->rdma_cm.dst, dst_addr,
+ sizeof(dst_addr)),
+ ret);
+ goto out;
+ }
+ ret = wait_for_completion_interruptible(&ch->done);
+ if (ret < 0)
+ goto out;
+
+ ret = ch->status;
+ if (ret) {
+ pr_err("Resolving address %s failed (%d)\n",
+ inet_ntop(&target->rdma_cm.dst, dst_addr,
+ sizeof(dst_addr)),
+ ret);
+ goto out;
+ }
+
+ swap(ch->rdma_cm.cm_id, new_cm_id);
+
+out:
+ if (new_cm_id)
+ rdma_destroy_id(new_cm_id);
+
+ return ret;
+}
+
+static int srp_new_cm_id(struct srp_rdma_ch *ch)
+{
+ struct srp_target_port *target = ch->target;
+
+ return target->using_rdma_cm ? srp_new_rdma_cm_id(ch) :
+ srp_new_ib_cm_id(ch);
+}
+
static struct ib_fmr_pool *srp_alloc_fmr_pool(struct srp_target_port *target)
{
struct srp_device *dev = target->srp_host->srp_dev;
@@ -521,16 +602,25 @@ static int srp_create_ch_ib(struct srp_rdma_ch *ch)
init_attr->send_cq = send_cq;
init_attr->recv_cq = recv_cq;

- qp = ib_create_qp(dev->pd, init_attr);
- if (IS_ERR(qp)) {
- ret = PTR_ERR(qp);
+ if (target->using_rdma_cm) {
+ ret = rdma_create_qp(ch->rdma_cm.cm_id, dev->pd, init_attr);
+ qp = ch->rdma_cm.cm_id->qp;
+ } else {
+ qp = ib_create_qp(dev->pd, init_attr);
+ if (!IS_ERR(qp)) {
+ ret = srp_init_ib_qp(target, qp);
+ if (ret)
+ ib_destroy_qp(qp);
+ } else {
+ ret = PTR_ERR(qp);
+ }
+ }
+ if (ret) {
+ pr_err("QP creation failed for dev %s: %d\n",
+ dev_name(&dev->dev->dev), ret);
goto err_send_cq;
}

- ret = srp_init_qp(target, qp);
- if (ret)
- goto err_qp;
-
if (dev->use_fast_reg) {
fr_pool = srp_alloc_fr_pool(target);
if (IS_ERR(fr_pool)) {
@@ -574,7 +664,10 @@ static int srp_create_ch_ib(struct srp_rdma_ch *ch)
return 0;

err_qp:
- ib_destroy_qp(qp);
+ if (target->using_rdma_cm)
+ rdma_destroy_qp(ch->rdma_cm.cm_id);
+ else
+ ib_destroy_qp(qp);

err_send_cq:
ib_free_cq(send_cq);
@@ -600,9 +693,16 @@ static void srp_free_ch_ib(struct srp_target_port *target,
if (!ch->target)
return;

- if (ch->cm_id) {
- ib_destroy_cm_id(ch->cm_id);
- ch->cm_id = NULL;
+ if (target->using_rdma_cm) {
+ if (ch->rdma_cm.cm_id) {
+ rdma_destroy_id(ch->rdma_cm.cm_id);
+ ch->rdma_cm.cm_id = NULL;
+ }
+ } else {
+ if (ch->ib_cm.cm_id) {
+ ib_destroy_cm_id(ch->ib_cm.cm_id);
+ ch->ib_cm.cm_id = NULL;
+ }
}

/* If srp_new_cm_id() succeeded but srp_create_ch_ib() not, return. */
@@ -658,16 +758,16 @@ static void srp_path_rec_completion(int status,
shost_printk(KERN_ERR, target->scsi_host,
PFX "Got failed path rec status %d\n", status);
else
- ch->path = *pathrec;
+ ch->ib_cm.path = *pathrec;
complete(&ch->done);
}

-static int srp_lookup_path(struct srp_rdma_ch *ch)
+static int srp_ib_lookup_path(struct srp_rdma_ch *ch)
{
struct srp_target_port *target = ch->target;
int ret = -ENODEV;

- ch->path.numb_path = 1;
+ ch->ib_cm.path.numb_path = 1;

init_completion(&ch->done);

@@ -678,10 +778,10 @@ static int srp_lookup_path(struct srp_rdma_ch *ch)
if (!scsi_host_get(target->scsi_host))
goto out;

- ch->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
+ ch->ib_cm.path_query_id = ib_sa_path_rec_get(&srp_sa_client,
target->srp_host->srp_dev->dev,
target->srp_host->port,
- &ch->path,
+ &ch->ib_cm.path,
IB_SA_PATH_REC_SERVICE_ID |
IB_SA_PATH_REC_DGID |
IB_SA_PATH_REC_SGID |
@@ -690,8 +790,8 @@ static int srp_lookup_path(struct srp_rdma_ch *ch)
SRP_PATH_REC_TIMEOUT_MS,
GFP_KERNEL,
srp_path_rec_completion,
- ch, &ch->path_query);
- ret = ch->path_query_id;
+ ch, &ch->ib_cm.path_query);
+ ret = ch->ib_cm.path_query_id;
if (ret < 0)
goto put;

@@ -703,9 +803,9 @@ static int srp_lookup_path(struct srp_rdma_ch *ch)
if (ret < 0)
shost_printk(KERN_WARNING, target->scsi_host,
PFX "Path record query failed: sgid %pI6, dgid %pI6, pkey %#04x, service_id %#16llx\n",
- ch->path.sgid.raw, ch->path.dgid.raw,
- be16_to_cpu(target->pkey),
- be64_to_cpu(target->service_id));
+ ch->ib_cm.path.sgid.raw, ch->ib_cm.path.dgid.raw,
+ be16_to_cpu(target->ib_cm.pkey),
+ be64_to_cpu(target->ib_cm.service_id));

put:
scsi_host_put(target->scsi_host);
@@ -714,6 +814,34 @@ static int srp_lookup_path(struct srp_rdma_ch *ch)
return ret;
}

+static int srp_rdma_lookup_path(struct srp_rdma_ch *ch)
+{
+ struct srp_target_port *target = ch->target;
+ int ret;
+
+ init_completion(&ch->done);
+
+ ret = rdma_resolve_route(ch->rdma_cm.cm_id, SRP_PATH_REC_TIMEOUT_MS);
+ if (ret)
+ return ret;
+
+ wait_for_completion_interruptible(&ch->done);
+
+ if (ch->status != 0)
+ shost_printk(KERN_WARNING, target->scsi_host,
+ PFX "Path resolution failed\n");
+
+ return ch->status;
+}
+
+static int srp_lookup_path(struct srp_rdma_ch *ch)
+{
+ struct srp_target_port *target = ch->target;
+
+ return target->using_rdma_cm ? srp_rdma_lookup_path(ch) :
+ srp_ib_lookup_path(ch);
+}
+
static u8 srp_get_subnet_timeout(struct srp_host *host)
{
struct ib_port_attr attr;
@@ -735,8 +863,10 @@ static int srp_send_req(struct srp_rdma_ch *ch, bool multich)
{
struct srp_target_port *target = ch->target;
struct {
- struct ib_cm_req_param param;
- struct srp_login_req priv;
+ struct rdma_conn_param rdma_param;
+ struct srp_login_req_rdma rdma_req;
+ struct ib_cm_req_param ib_param;
+ struct srp_login_req ib_req;
} *req = NULL;
char *ipi, *tpi;
int status;
@@ -745,44 +875,62 @@ static int srp_send_req(struct srp_rdma_ch *ch, bool multich)
if (!req)
return -ENOMEM;

- req->param.flow_control = 1;
- req->param.retry_count = target->tl_retry_count;
+ req->ib_param.flow_control = 1;
+ req->ib_param.retry_count = target->tl_retry_count;

/*
* Pick some arbitrary defaults here; we could make these
* module parameters if anyone cared about setting them.
*/
- req->param.responder_resources = 4;
- req->param.rnr_retry_count = 7;
- req->param.max_cm_retries = 15;
-
- req->priv.opcode = SRP_LOGIN_REQ;
- req->priv.tag = 0;
- req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
- req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
+ req->ib_param.responder_resources = 4;
+ req->ib_param.rnr_retry_count = 7;
+ req->ib_param.max_cm_retries = 15;
+
+ req->ib_req.opcode = SRP_LOGIN_REQ;
+ req->ib_req.tag = 0;
+ req->ib_req.req_it_iu_len = cpu_to_be32(target->max_iu_len);
+ req->ib_req.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
SRP_BUF_FORMAT_INDIRECT);
- req->priv.req_flags = (multich ? SRP_MULTICHAN_MULTI :
- SRP_MULTICHAN_SINGLE);
-
- {
+ req->ib_req.req_flags = (multich ? SRP_MULTICHAN_MULTI :
+ SRP_MULTICHAN_SINGLE);
+
+ if (target->using_rdma_cm) {
+ req->rdma_param.flow_control = req->ib_param.flow_control;
+ req->rdma_param.responder_resources =
+ req->ib_param.responder_resources;
+ req->rdma_param.initiator_depth = req->ib_param.initiator_depth;
+ req->rdma_param.retry_count = req->ib_param.retry_count;
+ req->rdma_param.rnr_retry_count = req->ib_param.rnr_retry_count;
+ req->rdma_param.private_data = &req->rdma_req;
+ req->rdma_param.private_data_len = sizeof(req->rdma_req);
+
+ req->rdma_req.opcode = req->ib_req.opcode;
+ req->rdma_req.tag = req->ib_req.tag;
+ req->rdma_req.req_it_iu_len = req->ib_req.req_it_iu_len;
+ req->rdma_req.req_buf_fmt = req->ib_req.req_buf_fmt;
+ req->rdma_req.req_flags = req->ib_req.req_flags;
+
+ ipi = req->rdma_req.initiator_port_id;
+ tpi = req->rdma_req.target_port_id;
+ } else {
u8 subnet_timeout;

subnet_timeout = srp_get_subnet_timeout(target->srp_host);

- req->param.primary_path = &ch->path;
- req->param.alternate_path = NULL;
- req->param.service_id = target->service_id;
- get_random_bytes(&req->param.starting_psn, 4);
- req->param.starting_psn &= 0xffffff;
- req->param.qp_num = ch->qp->qp_num;
- req->param.qp_type = ch->qp->qp_type;
- req->param.local_cm_response_timeout = subnet_timeout + 2;
- req->param.remote_cm_response_timeout = subnet_timeout + 2;
- req->param.private_data = &req->priv;
- req->param.private_data_len = sizeof(req->priv);
-
- ipi = req->priv.initiator_port_id;
- tpi = req->priv.target_port_id;
+ req->ib_param.primary_path = &ch->ib_cm.path;
+ req->ib_param.alternate_path = NULL;
+ req->ib_param.service_id = target->ib_cm.service_id;
+ get_random_bytes(&req->ib_param.starting_psn, 4);
+ req->ib_param.starting_psn &= 0xffffff;
+ req->ib_param.qp_num = ch->qp->qp_num;
+ req->ib_param.qp_type = ch->qp->qp_type;
+ req->ib_param.local_cm_response_timeout = subnet_timeout + 2;
+ req->ib_param.remote_cm_response_timeout = subnet_timeout + 2;
+ req->ib_param.private_data = &req->ib_req;
+ req->ib_param.private_data_len = sizeof(req->ib_req);
+
+ ipi = req->ib_req.initiator_port_id;
+ tpi = req->ib_req.target_port_id;
}

/*
@@ -820,7 +968,10 @@ static int srp_send_req(struct srp_rdma_ch *ch, bool multich)
memcpy(ipi + 8, &target->srp_host->srp_dev->dev->node_guid, 8);
}

- status = ib_send_cm_req(ch->cm_id, &req->param);
+ if (target->using_rdma_cm)
+ status = rdma_connect(ch->rdma_cm.cm_id, &req->rdma_param);
+ else
+ status = ib_send_cm_req(ch->ib_cm.cm_id, &req->ib_param);

kfree(req);

@@ -847,14 +998,23 @@ static bool srp_queue_remove_work(struct srp_target_port *target)
static void srp_disconnect_target(struct srp_target_port *target)
{
struct srp_rdma_ch *ch;
- int i;
+ int i, ret;

/* XXX should send SRP_I_LOGOUT request */

for (i = 0; i < target->ch_count; i++) {
ch = &target->ch[i];
ch->connected = false;
- if (ch->cm_id && ib_send_cm_dreq(ch->cm_id, NULL, 0)) {
+ ret = 0;
+ if (target->using_rdma_cm) {
+ if (ch->rdma_cm.cm_id)
+ rdma_disconnect(ch->rdma_cm.cm_id);
+ } else {
+ if (ch->ib_cm.cm_id)
+ ret = ib_send_cm_dreq(ch->ib_cm.cm_id,
+ NULL, 0);
+ }
+ if (ret < 0) {
shost_printk(KERN_DEBUG, target->scsi_host,
PFX "Sending CM DREQ failed\n");
}
@@ -2355,7 +2515,7 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
struct srp_target_port *target = ch->target;
struct ib_qp_attr *qp_attr = NULL;
int attr_mask = 0;
- int ret;
+ int ret = 0;
int i;

if (lrsp->opcode == SRP_LOGIN_RSP) {
@@ -2385,40 +2545,42 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
goto error;
}

- ret = -ENOMEM;
- qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
- if (!qp_attr)
- goto error;
-
- qp_attr->qp_state = IB_QPS_RTR;
- ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
- if (ret)
- goto error_free;
-
- ret = ib_modify_qp(ch->qp, qp_attr, attr_mask);
- if (ret)
- goto error_free;
-
for (i = 0; i < target->queue_size; i++) {
struct srp_iu *iu = ch->rx_ring[i];

ret = srp_post_recv(ch, iu);
if (ret)
- goto error_free;
+ goto error;
}

- qp_attr->qp_state = IB_QPS_RTS;
- ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
- if (ret)
- goto error_free;
+ if (!target->using_rdma_cm) {
+ ret = -ENOMEM;
+ qp_attr = kmalloc(sizeof(*qp_attr), GFP_KERNEL);
+ if (!qp_attr)
+ goto error;

- target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
+ qp_attr->qp_state = IB_QPS_RTR;
+ ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
+ if (ret)
+ goto error_free;

- ret = ib_modify_qp(ch->qp, qp_attr, attr_mask);
- if (ret)
- goto error_free;
+ ret = ib_modify_qp(ch->qp, qp_attr, attr_mask);
+ if (ret)
+ goto error_free;
+
+ qp_attr->qp_state = IB_QPS_RTS;
+ ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
+ if (ret)
+ goto error_free;

- ret = ib_send_cm_rtu(cm_id, NULL, 0);
+ target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
+
+ ret = ib_modify_qp(ch->qp, qp_attr, attr_mask);
+ if (ret)
+ goto error_free;
+
+ ret = ib_send_cm_rtu(cm_id, NULL, 0);
+ }

error_free:
kfree(qp_attr);
@@ -2427,41 +2589,43 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
ch->status = ret;
}

-static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
- struct ib_cm_event *event,
- struct srp_rdma_ch *ch)
+static void srp_ib_cm_rej_handler(struct ib_cm_id *cm_id,
+ struct ib_cm_event *event,
+ struct srp_rdma_ch *ch)
{
struct srp_target_port *target = ch->target;
struct Scsi_Host *shost = target->scsi_host;
struct ib_class_port_info *cpi;
int opcode;
+ u16 dlid;

switch (event->param.rej_rcvd.reason) {
case IB_CM_REJ_PORT_CM_REDIRECT:
cpi = event->param.rej_rcvd.ari;
- sa_path_set_dlid(&ch->path, ntohs(cpi->redirect_lid));
- ch->path.pkey = cpi->redirect_pkey;
+ dlid = be16_to_cpu(cpi->redirect_lid);
+ sa_path_set_dlid(&ch->ib_cm.path, dlid);
+ ch->ib_cm.path.pkey = cpi->redirect_pkey;
cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
- memcpy(ch->path.dgid.raw, cpi->redirect_gid, 16);
+ memcpy(ch->ib_cm.path.dgid.raw, cpi->redirect_gid, 16);

- ch->status = sa_path_get_dlid(&ch->path) ?
- SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
+ ch->status = dlid ? SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
break;

case IB_CM_REJ_PORT_REDIRECT:
if (srp_target_is_topspin(target)) {
+ union ib_gid *dgid = &ch->ib_cm.path.dgid;
+
/*
* Topspin/Cisco SRP gateways incorrectly send
* reject reason code 25 when they mean 24
* (port redirect).
*/
- memcpy(ch->path.dgid.raw,
- event->param.rej_rcvd.ari, 16);
+ memcpy(dgid->raw, event->param.rej_rcvd.ari, 16);

shost_printk(KERN_DEBUG, shost,
PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
- be64_to_cpu(ch->path.dgid.global.subnet_prefix),
- be64_to_cpu(ch->path.dgid.global.interface_id));
+ be64_to_cpu(dgid->global.subnet_prefix),
+ be64_to_cpu(dgid->global.interface_id));

ch->status = SRP_PORT_REDIRECT;
} else {
@@ -2490,7 +2654,8 @@ static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
shost_printk(KERN_WARNING, shost, PFX
"SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
target->sgid.raw,
- target->orig_dgid.raw, reason);
+ target->ib_cm.orig_dgid.raw,
+ reason);
} else
shost_printk(KERN_WARNING, shost,
" REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
@@ -2510,7 +2675,7 @@ static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
}
}

-static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
+static int srp_ib_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
{
struct srp_rdma_ch *ch = cm_id->context;
struct srp_target_port *target = ch->target;
@@ -2533,7 +2698,7 @@ static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
comp = 1;

- srp_cm_rej_handler(cm_id, event, ch);
+ srp_ib_cm_rej_handler(cm_id, event, ch);
break;

case IB_CM_DREQ_RECEIVED:
@@ -2571,6 +2736,135 @@ static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
return 0;
}

+static void srp_rdma_cm_rej_handler(struct srp_rdma_ch *ch,
+ struct rdma_cm_event *event)
+{
+ struct srp_target_port *target = ch->target;
+ struct Scsi_Host *shost = target->scsi_host;
+ int opcode;
+
+ switch (event->status) {
+ case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
+ shost_printk(KERN_WARNING, shost,
+ " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
+ ch->status = -ECONNRESET;
+ break;
+
+ case IB_CM_REJ_CONSUMER_DEFINED:
+ opcode = *(u8 *) event->param.conn.private_data;
+ if (opcode == SRP_LOGIN_REJ) {
+ struct srp_login_rej *rej =
+ (struct srp_login_rej *)
+ event->param.conn.private_data;
+ u32 reason = be32_to_cpu(rej->reason);
+
+ if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
+ shost_printk(KERN_WARNING, shost,
+ PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
+ else
+ shost_printk(KERN_WARNING, shost,
+ PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
+ } else {
+ shost_printk(KERN_WARNING, shost,
+ " REJ reason: IB_CM_REJ_CONSUMER_DEFINED, opcode 0x%02x\n",
+ opcode);
+ }
+ ch->status = -ECONNRESET;
+ break;
+
+ case IB_CM_REJ_STALE_CONN:
+ shost_printk(KERN_WARNING, shost,
+ " REJ reason: stale connection\n");
+ ch->status = SRP_STALE_CONN;
+ break;
+
+ default:
+ shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
+ event->status);
+ ch->status = -ECONNRESET;
+ break;
+ }
+}
+
+static int srp_rdma_cm_handler(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event)
+{
+ struct srp_rdma_ch *ch = cm_id->context;
+ struct srp_target_port *target = ch->target;
+ int comp = 0;
+
+ switch (event->event) {
+ case RDMA_CM_EVENT_ADDR_RESOLVED:
+ ch->status = 0;
+ comp = 1;
+ break;
+
+ case RDMA_CM_EVENT_ADDR_ERROR:
+ ch->status = -ENXIO;
+ comp = 1;
+ break;
+
+ case RDMA_CM_EVENT_ROUTE_RESOLVED:
+ ch->status = 0;
+ comp = 1;
+ break;
+
+ case RDMA_CM_EVENT_ROUTE_ERROR:
+ case RDMA_CM_EVENT_UNREACHABLE:
+ ch->status = -EHOSTUNREACH;
+ comp = 1;
+ break;
+
+ case RDMA_CM_EVENT_CONNECT_ERROR:
+ shost_printk(KERN_DEBUG, target->scsi_host,
+ PFX "Sending CM REQ failed\n");
+ comp = 1;
+ ch->status = -ECONNRESET;
+ break;
+
+ case RDMA_CM_EVENT_ESTABLISHED:
+ comp = 1;
+ srp_cm_rep_handler(NULL, event->param.conn.private_data, ch);
+ break;
+
+ case RDMA_CM_EVENT_REJECTED:
+ shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
+ comp = 1;
+
+ srp_rdma_cm_rej_handler(ch, event);
+ break;
+
+ case RDMA_CM_EVENT_DISCONNECTED:
+ if (ch->connected) {
+ shost_printk(KERN_WARNING, target->scsi_host,
+ PFX "received DREQ\n");
+ rdma_disconnect(ch->rdma_cm.cm_id);
+ comp = 1;
+ ch->status = 0;
+ queue_work(system_long_wq, &target->tl_err_work);
+ }
+ break;
+
+ case RDMA_CM_EVENT_TIMEWAIT_EXIT:
+ shost_printk(KERN_ERR, target->scsi_host,
+ PFX "connection closed\n");
+
+ comp = 1;
+ ch->status = 0;
+ break;
+
+ default:
+ shost_printk(KERN_WARNING, target->scsi_host,
+ PFX "Unhandled CM event %d\n", event->event);
+ break;
+ }
+
+ if (comp)
+ complete(&ch->done);
+
+ return 0;
+}
+
/**
* srp_change_queue_depth - setting device queue depth
* @sdev: scsi device struct
@@ -2772,7 +3066,10 @@ static ssize_t show_service_id(struct device *dev,
{
struct srp_target_port *target = host_to_target(class_to_shost(dev));

- return sprintf(buf, "0x%016llx\n", be64_to_cpu(target->service_id));
+ if (target->using_rdma_cm)
+ return -ENOENT;
+ return sprintf(buf, "0x%016llx\n",
+ be64_to_cpu(target->ib_cm.service_id));
}

static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
@@ -2780,7 +3077,9 @@ static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
{
struct srp_target_port *target = host_to_target(class_to_shost(dev));

- return sprintf(buf, "0x%04x\n", be16_to_cpu(target->pkey));
+ if (target->using_rdma_cm)
+ return -ENOENT;
+ return sprintf(buf, "0x%04x\n", be16_to_cpu(target->ib_cm.pkey));
}

static ssize_t show_sgid(struct device *dev, struct device_attribute *attr,
@@ -2797,7 +3096,9 @@ static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
struct srp_target_port *target = host_to_target(class_to_shost(dev));
struct srp_rdma_ch *ch = &target->ch[0];

- return sprintf(buf, "%pI6\n", ch->path.dgid.raw);
+ if (target->using_rdma_cm)
+ return -ENOENT;
+ return sprintf(buf, "%pI6\n", ch->ib_cm.path.dgid.raw);
}

static ssize_t show_orig_dgid(struct device *dev,
@@ -2805,7 +3106,9 @@ static ssize_t show_orig_dgid(struct device *dev,
{
struct srp_target_port *target = host_to_target(class_to_shost(dev));

- return sprintf(buf, "%pI6\n", target->orig_dgid.raw);
+ if (target->using_rdma_cm)
+ return -ENOENT;
+ return sprintf(buf, "%pI6\n", target->ib_cm.orig_dgid.raw);
}

static ssize_t show_req_lim(struct device *dev,
@@ -3050,6 +3353,9 @@ static bool srp_conn_unique(struct srp_host *host,
if (t != target &&
target->id_ext == t->id_ext &&
target->ioc_guid == t->ioc_guid &&
+ (!target->using_rdma_cm ||
+ memcmp(&target->rdma_cm.dst, &t->rdma_cm.dst,
+ sizeof(target->rdma_cm.dst)) == 0) &&
target->initiator_ext == t->initiator_ext) {
ret = false;
break;
@@ -3066,6 +3372,9 @@ static bool srp_conn_unique(struct srp_host *host,
*
* id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
* pkey=<P_Key>,service_id=<service ID>
+ * or
+ * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,
+ * [src=<IPv4 address>,]dest=<IPv4 address>:<port number>
*
* to the add_target sysfs attribute.
*/
@@ -3086,11 +3395,19 @@ enum {
SRP_OPT_COMP_VECTOR = 1 << 12,
SRP_OPT_TL_RETRY_COUNT = 1 << 13,
SRP_OPT_QUEUE_SIZE = 1 << 14,
- SRP_OPT_ALL = (SRP_OPT_ID_EXT |
- SRP_OPT_IOC_GUID |
- SRP_OPT_DGID |
- SRP_OPT_PKEY |
- SRP_OPT_SERVICE_ID),
+ SRP_OPT_IP_SRC = 1 << 15,
+ SRP_OPT_IP_DEST = 1 << 16,
+};
+
+static unsigned int srp_opt_mandatory[] = {
+ SRP_OPT_ID_EXT |
+ SRP_OPT_IOC_GUID |
+ SRP_OPT_DGID |
+ SRP_OPT_PKEY |
+ SRP_OPT_SERVICE_ID,
+ SRP_OPT_ID_EXT |
+ SRP_OPT_IOC_GUID |
+ SRP_OPT_IP_DEST,
};

static const match_table_t srp_opt_tokens = {
@@ -3109,9 +3426,25 @@ static const match_table_t srp_opt_tokens = {
{ SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
{ SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" },
{ SRP_OPT_QUEUE_SIZE, "queue_size=%d" },
+ { SRP_OPT_IP_SRC, "src=%s" },
+ { SRP_OPT_IP_DEST, "dest=%s" },
{ SRP_OPT_ERR, NULL }
};

+static int srp_parse_in(struct sockaddr_storage *sa, const char *addr_port_str)
+{
+ char *addr = kstrdup(addr_port_str, GFP_KERNEL);
+ char *port_str = addr;
+ int ret;
+
+ if (!addr)
+ return -ENOMEM;
+ strsep(&port_str, ":");
+ ret = inet_pton_with_scope(&init_net, AF_UNSPEC, addr, port_str, sa);
+ kfree(addr);
+ return ret;
+}
+
static int srp_parse_options(const char *buf, struct srp_target_port *target)
{
char *options, *sep_opt;
@@ -3180,7 +3513,7 @@ static int srp_parse_options(const char *buf, struct srp_target_port *target)
goto out;
}

- ret = hex2bin(target->orig_dgid.raw, p, 16);
+ ret = hex2bin(target->ib_cm.orig_dgid.raw, p, 16);
kfree(p);
if (ret < 0)
goto out;
@@ -3191,7 +3524,7 @@ static int srp_parse_options(const char *buf, struct srp_target_port *target)
pr_warn("bad P_Key parameter '%s'\n", p);
goto out;
}
- target->pkey = cpu_to_be16(token);
+ target->ib_cm.pkey = cpu_to_be16(token);
break;

case SRP_OPT_SERVICE_ID:
@@ -3206,7 +3539,39 @@ static int srp_parse_options(const char *buf, struct srp_target_port *target)
kfree(p);
goto out;
}
- target->service_id = cpu_to_be64(ull);
+ target->ib_cm.service_id = cpu_to_be64(ull);
+ kfree(p);
+ break;
+
+ case SRP_OPT_IP_SRC:
+ p = match_strdup(args);
+ if (!p) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ ret = srp_parse_in(&target->rdma_cm.src.ss, p);
+ if (ret < 0) {
+ pr_warn("bad source parameter '%s'\n", p);
+ kfree(p);
+ goto out;
+ }
+ target->rdma_cm.src_specified = true;
+ kfree(p);
+ break;
+
+ case SRP_OPT_IP_DEST:
+ p = match_strdup(args);
+ if (!p) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ ret = srp_parse_in(&target->rdma_cm.dst.ss, p);
+ if (ret < 0) {
+ pr_warn("bad dest parameter '%s'\n", p);
+ kfree(p);
+ goto out;
+ }
+ target->using_rdma_cm = true;
kfree(p);
break;

@@ -3321,14 +3686,14 @@ static int srp_parse_options(const char *buf, struct srp_target_port *target)
}
}

- if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
- ret = 0;
- else
- for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
- if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
- !(srp_opt_tokens[i].token & opt_mask))
- pr_warn("target creation request is missing parameter '%s'\n",
- srp_opt_tokens[i].pattern);
+ for (i = 0; i < ARRAY_SIZE(srp_opt_mandatory); i++) {
+ if ((opt_mask & srp_opt_mandatory[i]) == srp_opt_mandatory[i]) {
+ ret = 0;
+ break;
+ }
+ }
+ if (ret)
+ pr_warn("target creation request is missing one or more parameters\n");

if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue
&& (opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
@@ -3397,11 +3762,22 @@ static ssize_t srp_create_target(struct device *dev,
target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;

if (!srp_conn_unique(target->srp_host, target)) {
- shost_printk(KERN_INFO, target->scsi_host,
- PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
- be64_to_cpu(target->id_ext),
- be64_to_cpu(target->ioc_guid),
- be64_to_cpu(target->initiator_ext));
+ if (target->using_rdma_cm) {
+ char dst_addr[64];
+
+ shost_printk(KERN_INFO, target->scsi_host,
+ PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;dest=%s\n",
+ be64_to_cpu(target->id_ext),
+ be64_to_cpu(target->ioc_guid),
+ inet_ntop(&target->rdma_cm.dst, dst_addr,
+ sizeof(dst_addr)));
+ } else {
+ shost_printk(KERN_INFO, target->scsi_host,
+ PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
+ be64_to_cpu(target->id_ext),
+ be64_to_cpu(target->ioc_guid),
+ be64_to_cpu(target->initiator_ext));
+ }
ret = -EEXIST;
goto out;
}
@@ -3502,11 +3878,18 @@ static ssize_t srp_create_target(struct device *dev,

ret = srp_connect_ch(ch, multich);
if (ret) {
+ char dst[64];
+
+ if (target->using_rdma_cm)
+ inet_ntop(&target->rdma_cm.dst, dst,
+ sizeof(dst));
+ else
+ snprintf(dst, sizeof(dst), "%pI6",
+ target->ib_cm.orig_dgid.raw);
shost_printk(KERN_ERR, target->scsi_host,
- PFX "Connection %d/%d to %pI6 failed\n",
+ PFX "Connection %d/%d to %s failed\n",
ch_start + cpu_idx,
- target->ch_count,
- ch->target->orig_dgid.raw);
+ target->ch_count, dst);
if (node_idx == 0 && cpu_idx == 0) {
goto free_ch;
} else {
@@ -3531,13 +3914,25 @@ static ssize_t srp_create_target(struct device *dev,
goto err_disconnect;

if (target->state != SRP_TARGET_REMOVED) {
- shost_printk(KERN_DEBUG, target->scsi_host, PFX
- "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
- be64_to_cpu(target->id_ext),
- be64_to_cpu(target->ioc_guid),
- be16_to_cpu(target->pkey),
- be64_to_cpu(target->service_id),
- target->sgid.raw, target->orig_dgid.raw);
+ if (target->using_rdma_cm) {
+ char dst[64];
+
+ inet_ntop(&target->rdma_cm.dst, dst, sizeof(dst));
+ shost_printk(KERN_DEBUG, target->scsi_host, PFX
+ "new target: id_ext %016llx ioc_guid %016llx sgid %pI6 dest %s\n",
+ be64_to_cpu(target->id_ext),
+ be64_to_cpu(target->ioc_guid),
+ target->sgid.raw, dst);
+ } else {
+ shost_printk(KERN_DEBUG, target->scsi_host, PFX
+ "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
+ be64_to_cpu(target->id_ext),
+ be64_to_cpu(target->ioc_guid),
+ be16_to_cpu(target->ib_cm.pkey),
+ be64_to_cpu(target->ib_cm.service_id),
+ target->sgid.raw,
+ target->ib_cm.orig_dgid.raw);
+ }
}

ret = count;
diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h
index a814f5ef16f9..ce9d8e0f84dc 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.h
+++ b/drivers/infiniband/ulp/srp/ib_srp.h
@@ -45,6 +45,7 @@
#include <rdma/ib_sa.h>
#include <rdma/ib_cm.h>
#include <rdma/ib_fmr_pool.h>
+#include <rdma/rdma_cm.h>

enum {
SRP_PATH_REC_TIMEOUT_MS = 1000,
@@ -153,11 +154,18 @@ struct srp_rdma_ch {
struct completion done;
int status;

- struct sa_path_rec path;
- struct ib_sa_query *path_query;
- int path_query_id;
+ union {
+ struct ib_cm {
+ struct sa_path_rec path;
+ struct ib_sa_query *path_query;
+ int path_query_id;
+ struct ib_cm_id *cm_id;
+ } ib_cm;
+ struct rdma_cm {
+ struct rdma_cm_id *cm_id;
+ } rdma_cm;
+ };

- struct ib_cm_id *cm_id;
struct srp_iu **tx_ring;
struct srp_iu **rx_ring;
struct srp_request *req_ring;
@@ -194,7 +202,6 @@ struct srp_target_port {
union ib_gid sgid;
__be64 id_ext;
__be64 ioc_guid;
- __be64 service_id;
__be64 initiator_ext;
u16 io_class;
struct srp_host *srp_host;
@@ -210,8 +217,28 @@ struct srp_target_port {
int comp_vector;
int tl_retry_count;

- union ib_gid orig_dgid;
- __be16 pkey;
+ bool using_rdma_cm;
+
+ union {
+ struct {
+ __be64 service_id;
+ union ib_gid orig_dgid;
+ __be16 pkey;
+ } ib_cm;
+ struct {
+ union {
+ struct sockaddr_in ip4;
+ struct sockaddr_in6 ip6;
+ struct sockaddr_storage ss;
+ } src;
+ union {
+ struct sockaddr_in ip4;
+ struct sockaddr_in6 ip6;
+ struct sockaddr_storage ss;
+ } dst;
+ bool src_specified;
+ } rdma_cm;
+ };

u32 rq_tmo_jiffies;

diff --git a/include/scsi/srp.h b/include/scsi/srp.h
index 5be834de491a..c16a3c9a4d9b 100644
--- a/include/scsi/srp.h
+++ b/include/scsi/srp.h
@@ -129,6 +129,23 @@ struct srp_login_req {
u8 target_port_id[16];
};

+/**
+ * struct srp_login_req_rdma - RDMA/CM login parameters.
+ *
+ * RDMA/CM over InfiniBand can only carry 92 - 36 = 56 bytes of private
+ * data. The %srp_login_req_rdma structure contains the same information as
+ * %srp_login_req but with the reserved data removed.
+ */
+struct srp_login_req_rdma {
+ u64 tag;
+ __be16 req_buf_fmt;
+ u8 req_flags;
+ u8 opcode;
+ __be32 req_it_iu_len;
+ u8 initiator_port_id[16];
+ u8 target_port_id[16];
+};
+
/*
* The SRP spec defines the size of the LOGIN_RSP structure to be 52
* bytes, so it needs to be packed to avoid having it padded to 56