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nvme-rdma: add support for duplicate_connect option 

Adds support for the duplicate_connect option. When set to true,
checks whether there's an existing controller via the same target
address (traddr), target port (trsvcid), and if specified, host
address (host_traddr). Fails the connection request if there is
an existing controller.

Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
James Smart 2017-10-20 16:17:09 -07:00 committed by Christoph Hellwig
parent 991231dc48
commit 36e835f243
1 changed files with 82 additions and 0 deletions
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82
drivers/nvme/host/rdma.c
View File

@ -1851,6 +1851,83 @@ static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
.reinit_request = nvme_rdma_reinit_request,
};
static inline bool
__nvme_rdma_options_match(struct nvme_rdma_ctrl *ctrl,
struct nvmf_ctrl_options *opts)
{
char *stdport = __stringify(NVME_RDMA_IP_PORT);
if (!nvmf_ctlr_matches_baseopts(&ctrl->ctrl, opts) ||
strcmp(opts->traddr, ctrl->ctrl.opts->traddr))
return false;
if (opts->mask & NVMF_OPT_TRSVCID &&
ctrl->ctrl.opts->mask & NVMF_OPT_TRSVCID) {
if (strcmp(opts->trsvcid, ctrl->ctrl.opts->trsvcid))
return false;
} else if (opts->mask & NVMF_OPT_TRSVCID) {
if (strcmp(opts->trsvcid, stdport))
return false;
} else if (ctrl->ctrl.opts->mask & NVMF_OPT_TRSVCID) {
if (strcmp(stdport, ctrl->ctrl.opts->trsvcid))
return false;
}
/* else, it's a match as both have stdport. Fall to next checks */
/*
* checking the local address is rough. In most cases, one
* is not specified and the host port is selected by the stack.
*
* Assume no match if:
* local address is specified and address is not the same
* local address is not specified but remote is, or vice versa
* (admin using specific host_traddr when it matters).
*/
if (opts->mask & NVMF_OPT_HOST_TRADDR &&
ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR) {
if (strcmp(opts->host_traddr, ctrl->ctrl.opts->host_traddr))
return false;
} else if (opts->mask & NVMF_OPT_HOST_TRADDR ||
ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR)
return false;
/*
* if neither controller had an host port specified, assume it's
* a match as everything else matched.
*/
return true;
}
/*
* Fails a connection request if it matches an existing controller
* (association) with the same tuple:
* <Host NQN, Host ID, local address, remote address, remote port, SUBSYS NQN>
*
* if local address is not specified in the request, it will match an
* existing controller with all the other parameters the same and no
* local port address specified as well.
*
* The ports don't need to be compared as they are intrinsically
* already matched by the port pointers supplied.
*/
static bool
nvme_rdma_existing_controller(struct nvmf_ctrl_options *opts)
{
struct nvme_rdma_ctrl *ctrl;
bool found = false;
mutex_lock(&nvme_rdma_ctrl_mutex);
list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
found = __nvme_rdma_options_match(ctrl, opts);
if (found)
break;
}
mutex_unlock(&nvme_rdma_ctrl_mutex);
return found;
}
static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
struct nvmf_ctrl_options *opts)
{
@ -1887,6 +1964,11 @@ static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
}
}
if (!opts->duplicate_connect && nvme_rdma_existing_controller(opts)) {
ret = -EALREADY;
goto out_free_ctrl;
}
ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops,
0 /* no quirks, we're perfect! */);
if (ret)