Hi,
Le jeudi 30 janvier 2014 à 13:49 +0200, Eli Cohen a écrit :
> Commit c1be5232d21d "Fix micro UAR allocator" broke binary compatibility
> between libmlx5 and mlx5_ib since it defines a different value to the number of
> micro UARs per page, leading to wrong calculation in libmlx5. This patch
> defines struct mlx5_ib_alloc_ucontext_req_v2 as an extension to struct
> mlx5_ib_alloc_ucontext_req. The extended size is determined in
> mlx5_ib_alloc_ucontext() and in case of old library we use uuarn 0 which works
> fine -- this is acheived due to create_user_qp() falling back from high to
> medium then to low class where low class will return 0. For new libraries we
> use the more sophisticated allocation algorithm.
>
> Fixes: c1be5232d21d ('Fix micro UAR allocator')
> Signed-off-by: Eli Cohen <eli@xxxxxxxxxxxx>
Reviewed-by: Yann Droneaud <ydroneaud@xxxxxxxxxx>
> ---
> Changes from v1:
> Use 12 digit hash code as required
> Fix mlx5_ib_alloc_ucontext to subtract the size of struct ib_uverbs_cmd_hdr)
> Improve change log documentation
> Remove whitesapce
>
Thanks.
> drivers/infiniband/hw/mlx5/main.c | 19 +++++++++++++++++--
> drivers/infiniband/hw/mlx5/qp.c | 10 ++++++++--
> drivers/infiniband/hw/mlx5/user.h | 7 +++++++
> include/linux/mlx5/driver.h | 1 +
> 4 files changed, 33 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
> index 9660d093f8cf..f4ef4a24d410 100644
> --- a/drivers/infiniband/hw/mlx5/main.c
> +++ b/drivers/infiniband/hw/mlx5/main.c
> @@ -536,24 +536,38 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
> struct ib_udata *udata)
> {
> struct mlx5_ib_dev *dev = to_mdev(ibdev);
> - struct mlx5_ib_alloc_ucontext_req req;
> + struct mlx5_ib_alloc_ucontext_req_v2 req;
> struct mlx5_ib_alloc_ucontext_resp resp;
> struct mlx5_ib_ucontext *context;
> struct mlx5_uuar_info *uuari;
> struct mlx5_uar *uars;
> int gross_uuars;
> int num_uars;
> + int ver;
> int uuarn;
> int err;
> int i;
> + int reqlen;
>
> if (!dev->ib_active)
> return ERR_PTR(-EAGAIN);
>
> - err = ib_copy_from_udata(&req, udata, sizeof(req));
> + memset(&req, 0, sizeof(req));
> + reqlen = udata->inlen - sizeof(struct ib_uverbs_cmd_hdr);
> + if (reqlen == sizeof(struct mlx5_ib_alloc_ucontext_req))
> + ver = 0;
> + else if (reqlen == sizeof(struct mlx5_ib_alloc_ucontext_req_v2))
> + ver = 2;
> + else
> + return ERR_PTR(-EINVAL);
> +
> + err = ib_copy_from_udata(&req, udata, reqlen);
> if (err)
> return ERR_PTR(err);
>
> + if (req.flags || req.reserved)
> + return ERR_PTR(-EINVAL);
> +
> if (req.total_num_uuars > MLX5_MAX_UUARS)
> return ERR_PTR(-ENOMEM);
>
> @@ -626,6 +640,7 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
> if (err)
> goto out_uars;
>
> + uuari->ver = ver;
> uuari->num_low_latency_uuars = req.num_low_latency_uuars;
> uuari->uars = uars;
> uuari->num_uars = num_uars;
> diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
> index 492dc330e907..091576a777e9 100644
> --- a/drivers/infiniband/hw/mlx5/qp.c
> +++ b/drivers/infiniband/hw/mlx5/qp.c
> @@ -430,11 +430,17 @@ static int alloc_uuar(struct mlx5_uuar_info *uuari,
> break;
>
> case MLX5_IB_LATENCY_CLASS_MEDIUM:
> - uuarn = alloc_med_class_uuar(uuari);
> + if (uuari->ver < 2)
> + uuarn = -ENOMEM;
> + else
> + uuarn = alloc_med_class_uuar(uuari);
> break;
>
> case MLX5_IB_LATENCY_CLASS_HIGH:
> - uuarn = alloc_high_class_uuar(uuari);
> + if (uuari->ver < 2)
> + uuarn = -ENOMEM;
> + else
> + uuarn = alloc_high_class_uuar(uuari);
> break;
>
> case MLX5_IB_LATENCY_CLASS_FAST_PATH:
> diff --git a/drivers/infiniband/hw/mlx5/user.h b/drivers/infiniband/hw/mlx5/user.h
> index 32a2a5dfc523..0f4f8e42a17f 100644
> --- a/drivers/infiniband/hw/mlx5/user.h
> +++ b/drivers/infiniband/hw/mlx5/user.h
> @@ -62,6 +62,13 @@ struct mlx5_ib_alloc_ucontext_req {
> __u32 num_low_latency_uuars;
> };
>
> +struct mlx5_ib_alloc_ucontext_req_v2 {
> + __u32 total_num_uuars;
> + __u32 num_low_latency_uuars;
> + __u32 flags;
> + __u32 reserved;
> +};
> +
> struct mlx5_ib_alloc_ucontext_resp {
> __u32 qp_tab_size;
> __u32 bf_reg_size;
> diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
> index 554548cd3dd4..32cb18c399c2 100644
> --- a/include/linux/mlx5/driver.h
> +++ b/include/linux/mlx5/driver.h
> @@ -227,6 +227,7 @@ struct mlx5_uuar_info {
> * protect uuar allocation data structs
> */
> struct mutex lock;
> + u32 ver;
> };
>
> struct mlx5_bf {
--
Yann Droneaud
OPTEYA
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