RDMA: Support more than 255 rdma ports

Current code uses many different types when dealing with a port of a RDMA
device: u8, unsigned int and u32. Switch to u32 to clean up the logic.

This allows us to make (at least) the core view consistent and use the
same type. Unfortunately not all places can be converted. Many uverbs
functions expect port to be u8 so keep those places in order not to break
UAPIs.  HW/Spec defined values must also not be changed.

With the switch to u32 we now can support devices with more than 255
ports. U32_MAX is reserved to make control logic a bit easier to deal
with. As a device with U32_MAX ports probably isn't going to happen any
time soon this seems like a non issue.

When a device with more than 255 ports is created uverbs will report the
RDMA device as having 255 ports as this is the max currently supported.

The verbs interface is not changed yet because the IBTA spec limits the
port size in too many places to be u8 and all applications that relies in
verbs won't be able to cope with this change. At this stage, we are
extending the interfaces that are using vendor channel solely

Once the limitation is lifted mlx5 in switchdev mode will be able to have
thousands of SFs created by the device. As the only instance of an RDMA
device that reports more than 255 ports will be a representor device and
it exposes itself as a RAW Ethernet only device CM/MAD/IPoIB and other
ULPs aren't effected by this change and their sysfs/interfaces that are
exposes to userspace can remain unchanged.

While here cleanup some alignment issues and remove unneeded sanity
checks (mainly in rdmavt),

Link: https://lore.kernel.org/r/20210301070420.439400-1-leon@kernel.org
Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
index 3d194bb60840..74ca5e67a113 100644
--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -202,7 +202,7 @@ static struct attribute *cm_counter_default_attrs[] = {
 struct cm_port {
 	struct cm_device *cm_dev;
 	struct ib_mad_agent *mad_agent;
-	u8 port_num;
+	u32 port_num;
 	struct list_head cm_priv_prim_list;
 	struct list_head cm_priv_altr_list;
 	struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
@@ -1631,7 +1631,7 @@ static bool cm_req_has_alt_path(struct cm_req_msg *req_msg)
 					       req_msg))));
 }
 
-static void cm_path_set_rec_type(struct ib_device *ib_device, u8 port_num,
+static void cm_path_set_rec_type(struct ib_device *ib_device, u32 port_num,
 				 struct sa_path_rec *path, union ib_gid *gid)
 {
 	if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num))
@@ -1750,7 +1750,7 @@ static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
 static u16 cm_get_bth_pkey(struct cm_work *work)
 {
 	struct ib_device *ib_dev = work->port->cm_dev->ib_device;
-	u8 port_num = work->port->port_num;
+	u32 port_num = work->port->port_num;
 	u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
 	u16 pkey;
 	int ret;
@@ -1778,7 +1778,7 @@ static void cm_opa_to_ib_sgid(struct cm_work *work,
 			      struct sa_path_rec *path)
 {
 	struct ib_device *dev = work->port->cm_dev->ib_device;
-	u8 port_num = work->port->port_num;
+	u32 port_num = work->port->port_num;
 
 	if (rdma_cap_opa_ah(dev, port_num) &&
 	    (ib_is_opa_gid(&path->sgid))) {
@@ -4334,7 +4334,7 @@ static int cm_add_one(struct ib_device *ib_device)
 	unsigned long flags;
 	int ret;
 	int count = 0;
-	unsigned int i;
+	u32 i;
 
 	cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt),
 			 GFP_KERNEL);
@@ -4432,7 +4432,7 @@ static void cm_remove_one(struct ib_device *ib_device, void *client_data)
 		.clr_port_cap_mask = IB_PORT_CM_SUP
 	};
 	unsigned long flags;
-	unsigned int i;
+	u32 i;
 
 	write_lock_irqsave(&cm.device_lock, flags);
 	list_del(&cm_dev->list);