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authorHariprasad Shenai <hariprasad@chelsio.com>2014-11-21 18:36:36 +0300
committerRoland Dreier <roland@purestorage.com>2014-12-16 05:10:46 +0300
commit2550a88d956fb77c34d71b46a0a8e9ebf1c5b4a3 (patch)
tree6d2aa56589f7f2ddd4bd2d5f8e3adb8d682a5e6a /drivers/infiniband/hw/cxgb4/mem.c
parent10be6b48fd870f1076f746d614deed6b9d21ce2a (diff)
downloadlinux-2550a88d956fb77c34d71b46a0a8e9ebf1c5b4a3.tar.xz
RDMA/cxgb4: Limit MRs to < 8GB for T4/T5 devices
T4/T5 hardware can't handle MRs >= 8GB due to a hardware bug. So limit registrations to < 8GB for thse devices. Based on original work by Steve Wise <swise@opengridcomputing.com>. Signed-off-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/hw/cxgb4/mem.c')
-rw-r--r--drivers/infiniband/hw/cxgb4/mem.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/cxgb4/mem.c b/drivers/infiniband/hw/cxgb4/mem.c
index 6bf14d803e5a..cb43c2299ac0 100644
--- a/drivers/infiniband/hw/cxgb4/mem.c
+++ b/drivers/infiniband/hw/cxgb4/mem.c
@@ -50,6 +50,13 @@ static int inline_threshold = C4IW_INLINE_THRESHOLD;
module_param(inline_threshold, int, 0644);
MODULE_PARM_DESC(inline_threshold, "inline vs dsgl threshold (default=128)");
+static int mr_exceeds_hw_limits(struct c4iw_dev *dev, u64 length)
+{
+ return (is_t4(dev->rdev.lldi.adapter_type) ||
+ is_t5(dev->rdev.lldi.adapter_type)) &&
+ length >= 8*1024*1024*1024ULL;
+}
+
static int _c4iw_write_mem_dma_aligned(struct c4iw_rdev *rdev, u32 addr,
u32 len, dma_addr_t data, int wait)
{
@@ -538,6 +545,11 @@ int c4iw_reregister_phys_mem(struct ib_mr *mr, int mr_rereg_mask,
return ret;
}
+ if (mr_exceeds_hw_limits(rhp, total_size)) {
+ kfree(page_list);
+ return -EINVAL;
+ }
+
ret = reregister_mem(rhp, php, &mh, shift, npages);
kfree(page_list);
if (ret)
@@ -598,6 +610,12 @@ struct ib_mr *c4iw_register_phys_mem(struct ib_pd *pd,
if (ret)
goto err;
+ if (mr_exceeds_hw_limits(rhp, total_size)) {
+ kfree(page_list);
+ ret = -EINVAL;
+ goto err;
+ }
+
ret = alloc_pbl(mhp, npages);
if (ret) {
kfree(page_list);
@@ -701,6 +719,10 @@ struct ib_mr *c4iw_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
php = to_c4iw_pd(pd);
rhp = php->rhp;
+
+ if (mr_exceeds_hw_limits(rhp, length))
+ return ERR_PTR(-EINVAL);
+
mhp = kzalloc(sizeof(*mhp), GFP_KERNEL);
if (!mhp)
return ERR_PTR(-ENOMEM);