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IB/mlx5: Extend QP creation to get uar page index from user space

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Extend QP creation to get uar page index from user space, this mode can be
used with the UAR dynamic mode APIs to allocate/destroy a UAR object.

As part of enabling this option blocked the weird/un-supported cross
channel option which uses index 0 hard-coded.

This QP flag wasn't exposed to user space as part of any formal upstream
release, the dynamic option can allow having valid UAR page index instead.

Link: https://lore.kernel.org/r/20200324060143.1569116-4-leon@kernel.org
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Reviewed-by: Michael Guralnik <michaelgur@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Yishai Hadas 2020-03-24 08:01:41 +02:00 committed by Jason Gunthorpe
parent 64d99f6a62
commit ac42a5ee92
2 changed files with 18 additions and 10 deletions
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27
drivers/infiniband/hw/mlx5/qp.c
View file

@ -919,6 +919,7 @@ static int create_user_qp(struct mlx5_ib_dev *dev, struct ib_pd *pd,
void *qpc;
int err;
u16 uid;
u32 uar_flags;
err = ib_copy_from_udata(&ucmd, udata, sizeof(ucmd));
if (err) {
@ -928,24 +929,29 @@ static int create_user_qp(struct mlx5_ib_dev *dev, struct ib_pd *pd,
context = rdma_udata_to_drv_context(udata, struct mlx5_ib_ucontext,
ibucontext);
if (ucmd.flags & MLX5_QP_FLAG_BFREG_INDEX) {
uar_flags = ucmd.flags & (MLX5_QP_FLAG_UAR_PAGE_INDEX |
MLX5_QP_FLAG_BFREG_INDEX);
switch (uar_flags) {
case MLX5_QP_FLAG_UAR_PAGE_INDEX:
uar_index = ucmd.bfreg_index;
bfregn = MLX5_IB_INVALID_BFREG;
break;
case MLX5_QP_FLAG_BFREG_INDEX:
uar_index = bfregn_to_uar_index(dev, &context->bfregi,
ucmd.bfreg_index, true);
if (uar_index < 0)
return uar_index;
bfregn = MLX5_IB_INVALID_BFREG;
} else if (qp->flags & MLX5_IB_QP_CROSS_CHANNEL) {
/*
* TBD: should come from the verbs when we have the API
*/
/* In CROSS_CHANNEL CQ and QP must use the same UAR */
bfregn = MLX5_CROSS_CHANNEL_BFREG;
}
else {
break;
case 0:
if (qp->flags & MLX5_IB_QP_CROSS_CHANNEL)
return -EINVAL;
bfregn = alloc_bfreg(dev, &context->bfregi);
if (bfregn < 0)
return bfregn;
break;
default:
return -EINVAL;
}
mlx5_ib_dbg(dev, "bfregn 0x%x, uar_index 0x%x\n", bfregn, uar_index);
@ -2100,6 +2106,7 @@ static int create_qp_common(struct mlx5_ib_dev *dev, struct ib_pd *pd,
MLX5_QP_FLAG_TIR_ALLOW_SELF_LB_MC |
MLX5_QP_FLAG_TIR_ALLOW_SELF_LB_UC |
MLX5_QP_FLAG_TUNNEL_OFFLOADS |
MLX5_QP_FLAG_UAR_PAGE_INDEX |
MLX5_QP_FLAG_TYPE_DCI |
MLX5_QP_FLAG_TYPE_DCT))
return -EINVAL;

1
include/uapi/rdma/mlx5-abi.h
View file

@ -49,6 +49,7 @@ enum {
MLX5_QP_FLAG_TIR_ALLOW_SELF_LB_MC = 1 << 7,
MLX5_QP_FLAG_ALLOW_SCATTER_CQE = 1 << 8,
MLX5_QP_FLAG_PACKET_BASED_CREDIT_MODE = 1 << 9,
MLX5_QP_FLAG_UAR_PAGE_INDEX = 1 << 10,
};
enum {