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IB/srpt: Introduce helper functions for SRQ allocation and freeing 

The only functional change in this patch is in the srpt_add_one()
error path: if allocating the ring buffer for the SRQ fails, fall
back to non-SRQ mode instead of disabling SRP target functionality.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bart Van Assche 2017-11-03 16:20:53 -07:00 committed by Doug Ledford
parent 321e329b9c
commit c76d7d64f8
1 changed files with 72 additions and 43 deletions
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115
drivers/infiniband/ulp/srpt/ib_srpt.c
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@ -2510,6 +2510,74 @@ static struct se_wwn *srpt_lookup_wwn(const char *name)
return wwn;
}
static void srpt_free_srq(struct srpt_device *sdev)
{
if (!sdev->srq)
return;
ib_destroy_srq(sdev->srq);
srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE);
sdev->srq = NULL;
}
static int srpt_alloc_srq(struct srpt_device *sdev)
{
struct ib_srq_init_attr srq_attr = {
.event_handler = srpt_srq_event,
.srq_context = (void *)sdev,
.attr.max_wr = sdev->srq_size,
.attr.max_sge = 1,
.srq_type = IB_SRQT_BASIC,
};
struct ib_device *device = sdev->device;
struct ib_srq *srq;
int i;
WARN_ON_ONCE(sdev->srq);
srq = ib_create_srq(sdev->pd, &srq_attr);
if (IS_ERR(srq)) {
pr_debug("ib_create_srq() failed: %ld\n", PTR_ERR(srq));
return PTR_ERR(srq);
}
pr_debug("create SRQ #wr= %d max_allow=%d dev= %s\n", sdev->srq_size,
sdev->device->attrs.max_srq_wr, device->name);
sdev->ioctx_ring = (struct srpt_recv_ioctx **)
srpt_alloc_ioctx_ring(sdev, sdev->srq_size,
sizeof(*sdev->ioctx_ring[0]),
srp_max_req_size, DMA_FROM_DEVICE);
if (!sdev->ioctx_ring) {
ib_destroy_srq(srq);
return -ENOMEM;
}
sdev->use_srq = true;
sdev->srq = srq;
for (i = 0; i < sdev->srq_size; ++i)
srpt_post_recv(sdev, NULL, sdev->ioctx_ring[i]);
return 0;
}
static int srpt_use_srq(struct srpt_device *sdev, bool use_srq)
{
struct ib_device *device = sdev->device;
int ret = 0;
if (!use_srq) {
srpt_free_srq(sdev);
sdev->use_srq = false;
} else if (use_srq && !sdev->srq) {
ret = srpt_alloc_srq(sdev);
}
pr_debug("%s(%s): use_srq = %d; ret = %d\n", __func__, device->name,
sdev->use_srq, ret);
return ret;
}
/**
* srpt_add_one() - Infiniband device addition callback function.
*/
@ -2517,7 +2585,6 @@ static void srpt_add_one(struct ib_device *device)
{
struct srpt_device *sdev;
struct srpt_port *sport;
struct ib_srq_init_attr srq_attr;
int i;
pr_debug("device = %p\n", device);
@ -2539,38 +2606,7 @@ static void srpt_add_one(struct ib_device *device)
sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr);
srq_attr.event_handler = srpt_srq_event;
srq_attr.srq_context = (void *)sdev;
srq_attr.attr.max_wr = sdev->srq_size;
srq_attr.attr.max_sge = 1;
srq_attr.attr.srq_limit = 0;
srq_attr.srq_type = IB_SRQT_BASIC;
sdev->srq = sdev->port[0].port_attrib.use_srq ?
ib_create_srq(sdev->pd, &srq_attr) : ERR_PTR(-ENOTSUPP);
if (IS_ERR(sdev->srq)) {
pr_debug("ib_create_srq() failed: %ld\n", PTR_ERR(sdev->srq));
/* SRQ not supported. */
sdev->use_srq = false;
} else {
pr_debug("create SRQ #wr= %d max_allow=%d dev= %s\n",
sdev->srq_size, sdev->device->attrs.max_srq_wr,
device->name);
sdev->use_srq = true;
sdev->ioctx_ring = (struct srpt_recv_ioctx **)
srpt_alloc_ioctx_ring(sdev, sdev->srq_size,
sizeof(*sdev->ioctx_ring[0]),
srp_max_req_size,
DMA_FROM_DEVICE);
if (!sdev->ioctx_ring)
goto err_pd;
for (i = 0; i < sdev->srq_size; ++i)
srpt_post_recv(sdev, NULL, sdev->ioctx_ring[i]);
}
srpt_use_srq(sdev, sdev->port[0].port_attrib.use_srq);
if (!srpt_service_guid)
srpt_service_guid = be64_to_cpu(device->node_guid);
@ -2630,12 +2666,7 @@ err_event:
err_cm:
ib_destroy_cm_id(sdev->cm_id);
err_ring:
if (sdev->use_srq)
ib_destroy_srq(sdev->srq);
srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
sdev->srq_size, srp_max_req_size,
DMA_FROM_DEVICE);
err_pd:
srpt_free_srq(sdev);
ib_dealloc_pd(sdev->pd);
free_dev:
kfree(sdev);
@ -2678,10 +2709,8 @@ static void srpt_remove_one(struct ib_device *device, void *client_data)
spin_unlock(&srpt_dev_lock);
srpt_release_sdev(sdev);
if (sdev->use_srq)
ib_destroy_srq(sdev->srq);
srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE);
srpt_free_srq(sdev);
ib_dealloc_pd(sdev->pd);
kfree(sdev);