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Commit 2550a88d authored by Hariprasad Shenai's avatar Hariprasad Shenai Committed by Roland Dreier
Browse files

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: default avatarSteve Wise <swise@opengridcomputing.com>
Signed-off-by: default avatarHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: default avatarRoland Dreier <roland@purestorage.com>
parent 10be6b48

drivers/infiniband/hw/cxgb4/mem.c

+22 −0
Original line number Diff line number Diff line
@@ -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);