diff options
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c b/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c index d894a88fa9f2..972e8e9df585 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c @@ -608,6 +608,11 @@ enum { RELEASE_ALL_PAGES_MASK = 0x4000, }; +/* This limit is based on the capability of the firmware as it cannot release + * more than 50000 back to the host in one go. + */ +#define MAX_RECLAIM_NPAGES (-50000) + static int req_pages_handler(struct notifier_block *nb, unsigned long type, void *data) { @@ -639,7 +644,16 @@ static int req_pages_handler(struct notifier_block *nb, req->dev = dev; req->func_id = func_id; - req->npages = npages; + + /* npages > 0 means HCA asking host to allocate/give pages, + * npages < 0 means HCA asking host to reclaim back the pages allocated. + * Here we are restricting the maximum number of pages that can be + * reclaimed to be MAX_RECLAIM_NPAGES. Note that MAX_RECLAIM_NPAGES is + * a negative value. + * Since MAX_RECLAIM is negative, we are using max() to restrict + * req->npages (and not min ()). + */ + req->npages = max_t(s32, npages, MAX_RECLAIM_NPAGES); req->ec_function = ec_function; req->release_all = release_all; INIT_WORK(&req->work, pages_work_handler); |