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>

3 files changed, 9 insertions, 9 deletions

diff --git a/drivers/infiniband/sw/rxe/rxe_hw_counters.c b/drivers/infiniband/sw/rxe/rxe_hw_counters.c
index ac9154f0593d..f469fd1c753d 100644
--- a/drivers/infiniband/sw/rxe/rxe_hw_counters.c
+++ b/drivers/infiniband/sw/rxe/rxe_hw_counters.c
@@ -26,7 +26,7 @@ static const char * const rxe_counter_name[] = {
 
 int rxe_ib_get_hw_stats(struct ib_device *ibdev,
 			struct rdma_hw_stats *stats,
-			u8 port, int index)
+			u32 port, int index)
 {
 	struct rxe_dev *dev = to_rdev(ibdev);
 	unsigned int cnt;
@@ -41,7 +41,7 @@ int rxe_ib_get_hw_stats(struct ib_device *ibdev,
 }
 
 struct rdma_hw_stats *rxe_ib_alloc_hw_stats(struct ib_device *ibdev,
-					    u8 port_num)
+					    u32 port_num)
 {
 	BUILD_BUG_ON(ARRAY_SIZE(rxe_counter_name) != RXE_NUM_OF_COUNTERS);
 	/* We support only per port stats */
diff --git a/drivers/infiniband/sw/rxe/rxe_hw_counters.h b/drivers/infiniband/sw/rxe/rxe_hw_counters.h
index 49ee6f96656d..2f369acb46d7 100644
--- a/drivers/infiniband/sw/rxe/rxe_hw_counters.h
+++ b/drivers/infiniband/sw/rxe/rxe_hw_counters.h
@@ -30,8 +30,8 @@ enum rxe_counters {
 };
 
 struct rdma_hw_stats *rxe_ib_alloc_hw_stats(struct ib_device *ibdev,
-					    u8 port_num);
+					    u32 port_num);
 int rxe_ib_get_hw_stats(struct ib_device *ibdev,
 			struct rdma_hw_stats *stats,
-			u8 port, int index);
+			u32 port, int index);
 #endif /* RXE_HW_COUNTERS_H */
diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c
index dee5e0e919d2..a76139a92067 100644
--- a/drivers/infiniband/sw/rxe/rxe_verbs.c
+++ b/drivers/infiniband/sw/rxe/rxe_verbs.c
@@ -26,7 +26,7 @@ static int rxe_query_device(struct ib_device *dev,
 }
 
 static int rxe_query_port(struct ib_device *dev,
-			  u8 port_num, struct ib_port_attr *attr)
+			  u32 port_num, struct ib_port_attr *attr)
 {
 	struct rxe_dev *rxe = to_rdev(dev);
 	struct rxe_port *port;
@@ -54,7 +54,7 @@ static int rxe_query_port(struct ib_device *dev,
 }
 
 static int rxe_query_pkey(struct ib_device *device,
-			  u8 port_num, u16 index, u16 *pkey)
+			  u32 port_num, u16 index, u16 *pkey)
 {
 	if (index > 0)
 		return -EINVAL;
@@ -84,7 +84,7 @@ static int rxe_modify_device(struct ib_device *dev,
 }
 
 static int rxe_modify_port(struct ib_device *dev,
-			   u8 port_num, int mask, struct ib_port_modify *attr)
+			   u32 port_num, int mask, struct ib_port_modify *attr)
 {
 	struct rxe_dev *rxe = to_rdev(dev);
 	struct rxe_port *port;
@@ -101,7 +101,7 @@ static int rxe_modify_port(struct ib_device *dev,
 }
 
 static enum rdma_link_layer rxe_get_link_layer(struct ib_device *dev,
-					       u8 port_num)
+					       u32 port_num)
 {
 	return IB_LINK_LAYER_ETHERNET;
 }
@@ -121,7 +121,7 @@ static void rxe_dealloc_ucontext(struct ib_ucontext *ibuc)
 	rxe_drop_ref(uc);
 }
 
-static int rxe_port_immutable(struct ib_device *dev, u8 port_num,
+static int rxe_port_immutable(struct ib_device *dev, u32 port_num,
 			      struct ib_port_immutable *immutable)
 {
 	int err;