[PATCH 3.16 014/328] IB/srpt: Support HCAs with more than two ports

Ben Hutchings
2018-12-09T22:27:28Z

From: Bart Van Assche <bart.vanassche@wdc.com>

commit e620ebfc228dcbef7519e3d16f43c6c6f1a1d0cb upstream.

Since there are adapters that have four ports, increase the size of
the srpt_device.port[] array. This patch avoids that the following
warning is hit with quad port Chelsio adapters:

WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port));

Reported-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Steve Wise <swise@opengridcomputing.com>
Cc: Christoph Hellwig <hch@infradead.org>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
[bwh: Backported to 3.16:
- Use inline calculation instead of struct_size; the number of ports is not
user-controlled so no overflow check is needed
- Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -3147,7 +3147,9 @@ static void srpt_add_one(struct ib_devic
pr_debug("device = %p, device->dma_ops = %p\n", device,
device->dma_ops);

- sdev = kzalloc(sizeof *sdev, GFP_KERNEL);
+ sdev = kzalloc(sizeof(*sdev) +
+ device->phys_port_cnt * sizeof(*sdev->port),
+ GFP_KERNEL);
if (!sdev)
goto err;

@@ -3220,8 +3222,6 @@ static void srpt_add_one(struct ib_devic
for (i = 0; i < sdev->srq_size; ++i)
srpt_post_recv(sdev, sdev->ioctx_ring[i]);

- WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port));
-
for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
sport = &sdev->port[i - 1];
sport->sdev = sdev;
--- a/drivers/infiniband/ulp/srpt/ib_srpt.h
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.h
@@ -387,9 +387,9 @@ struct srpt_port {
* @rch_list: Per-device channel list -- see also srpt_rdma_ch.list.
* @ch_releaseQ: Enables waiting for removal from rch_list.
* @spinlock: Protects rch_list and tpg.
- * @port: Information about the ports owned by this HCA.
* @event_handler: Per-HCA asynchronous IB event handler.
* @list: Node in srpt_dev_list.
+ * @port: Information about the ports owned by this HCA.
*/
struct srpt_device {
struct ib_device *device;
@@ -403,9 +403,9 @@ struct srpt_device {
struct list_head rch_list;
wait_queue_head_t ch_releaseQ;
spinlock_t spinlock;
- struct srpt_port port[2];
struct ib_event_handler event_handler;
struct list_head list;
+ struct srpt_port port[];
};

/**