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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>
This commit is contained in:
Hariprasad Shenai 2014-11-21 09:36:36 -06:00 committed by Roland Dreier
parent 10be6b48fd
commit 2550a88d95
1 changed files with 22 additions and 0 deletions
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22
drivers/infiniband/hw/cxgb4/mem.c
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@ -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);