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Date: Thu, 27 Sep 2018 13:18:20 -0700
From: Nick Desaulniers <ndesaulniers@...gle.com>
To: Nathan Chancellor <natechancellor@...il.com>
Cc: monis@...lanox.com, dledford@...hat.com, jgg@...pe.ca,
linux-rdma@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] IB/rxe: Remove unnecessary enum values
On Wed, Sep 26, 2018 at 10:14 PM Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> Clang warns when an emumerated type is implicitly converted to another.
>
> drivers/infiniband/sw/rxe/rxe.c:106:27: warning: implicit conversion
> from enumeration type 'enum rxe_device_param' to different enumeration
> type 'enum ib_atomic_cap' [-Wenum-conversion]
> rxe->attr.atomic_cap = RXE_ATOMIC_CAP;
> ~ ^~~~~~~~~~~~~~
> drivers/infiniband/sw/rxe/rxe.c:131:22: warning: implicit conversion
> from enumeration type 'enum rxe_port_param' to different enumeration
> type 'enum ib_port_state' [-Wenum-conversion]
> port->attr.state = RXE_PORT_STATE;
> ~ ^~~~~~~~~~~~~~
> drivers/infiniband/sw/rxe/rxe.c:132:24: warning: implicit conversion
> from enumeration type 'enum rxe_port_param' to different enumeration
> type 'enum ib_mtu' [-Wenum-conversion]
> port->attr.max_mtu = RXE_PORT_MAX_MTU;
> ~ ^~~~~~~~~~~~~~~~
> drivers/infiniband/sw/rxe/rxe.c:133:27: warning: implicit conversion
> from enumeration type 'enum rxe_port_param' to different enumeration
> type 'enum ib_mtu' [-Wenum-conversion]
> port->attr.active_mtu = RXE_PORT_ACTIVE_MTU;
> ~ ^~~~~~~~~~~~~~~~~~~
> drivers/infiniband/sw/rxe/rxe.c:151:24: warning: implicit conversion
> from enumeration type 'enum rxe_port_param' to different enumeration
> type 'enum ib_mtu' [-Wenum-conversion]
> ib_mtu_enum_to_int(RXE_PORT_ACTIVE_MTU);
> ~~~~~~~~~~~~~~~~~~ ^~~~~~~~~~~~~~~~~~~
> 5 warnings generated.
>
> Use the appropriate values from the expected enumerated type so no
> conversion needs to happen then remove the unneeded definitions.
>
> Reported-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
Nathan,
Thanks for taking the time to respond to feedback and send incremental
revisions to this patch.
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
>
> v1 -> v2:
>
> * Don't cast, just use the expecting enumerated value directly, per
> Jason's request
>
> v2 -> v3:
>
> * Convert two spots from RXE_PORT_MAX_MTU to IB_MTU_4096 then remove
> value definitions.
>
> drivers/infiniband/sw/rxe/rxe.c | 13 ++++++-------
> drivers/infiniband/sw/rxe/rxe_loc.h | 2 +-
> drivers/infiniband/sw/rxe/rxe_param.h | 4 ----
> 3 files changed, 7 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/infiniband/sw/rxe/rxe.c b/drivers/infiniband/sw/rxe/rxe.c
> index 10999fa69281..383e65c7bbc0 100644
> --- a/drivers/infiniband/sw/rxe/rxe.c
> +++ b/drivers/infiniband/sw/rxe/rxe.c
> @@ -103,7 +103,7 @@ static void rxe_init_device_param(struct rxe_dev *rxe)
> rxe->attr.max_res_rd_atom = RXE_MAX_RES_RD_ATOM;
> rxe->attr.max_qp_init_rd_atom = RXE_MAX_QP_INIT_RD_ATOM;
> rxe->attr.max_ee_init_rd_atom = RXE_MAX_EE_INIT_RD_ATOM;
> - rxe->attr.atomic_cap = RXE_ATOMIC_CAP;
> + rxe->attr.atomic_cap = IB_ATOMIC_HCA;
> rxe->attr.max_ee = RXE_MAX_EE;
> rxe->attr.max_rdd = RXE_MAX_RDD;
> rxe->attr.max_mw = RXE_MAX_MW;
> @@ -128,9 +128,9 @@ static void rxe_init_device_param(struct rxe_dev *rxe)
> /* initialize port attributes */
> static int rxe_init_port_param(struct rxe_port *port)
> {
> - port->attr.state = RXE_PORT_STATE;
> - port->attr.max_mtu = RXE_PORT_MAX_MTU;
> - port->attr.active_mtu = RXE_PORT_ACTIVE_MTU;
> + port->attr.state = IB_PORT_DOWN;
> + port->attr.max_mtu = IB_MTU_4096;
> + port->attr.active_mtu = IB_MTU_256;
> port->attr.gid_tbl_len = RXE_PORT_GID_TBL_LEN;
> port->attr.port_cap_flags = RXE_PORT_PORT_CAP_FLAGS;
> port->attr.max_msg_sz = RXE_PORT_MAX_MSG_SZ;
> @@ -147,8 +147,7 @@ static int rxe_init_port_param(struct rxe_port *port)
> port->attr.active_width = RXE_PORT_ACTIVE_WIDTH;
> port->attr.active_speed = RXE_PORT_ACTIVE_SPEED;
> port->attr.phys_state = RXE_PORT_PHYS_STATE;
> - port->mtu_cap =
> - ib_mtu_enum_to_int(RXE_PORT_ACTIVE_MTU);
> + port->mtu_cap = ib_mtu_enum_to_int(IB_MTU_256);
> port->subnet_prefix = cpu_to_be64(RXE_PORT_SUBNET_PREFIX);
>
> return 0;
> @@ -300,7 +299,7 @@ void rxe_set_mtu(struct rxe_dev *rxe, unsigned int ndev_mtu)
> mtu = eth_mtu_int_to_enum(ndev_mtu);
>
> /* Make sure that new MTU in range */
> - mtu = mtu ? min_t(enum ib_mtu, mtu, RXE_PORT_MAX_MTU) : IB_MTU_256;
> + mtu = mtu ? min_t(enum ib_mtu, mtu, IB_MTU_4096) : IB_MTU_256;
>
> port->attr.active_mtu = mtu;
> port->mtu_cap = ib_mtu_enum_to_int(mtu);
> diff --git a/drivers/infiniband/sw/rxe/rxe_loc.h b/drivers/infiniband/sw/rxe/rxe_loc.h
> index 8e305422adbb..afd53f57a62b 100644
> --- a/drivers/infiniband/sw/rxe/rxe_loc.h
> +++ b/drivers/infiniband/sw/rxe/rxe_loc.h
> @@ -195,7 +195,7 @@ static inline int qp_mtu(struct rxe_qp *qp)
> if (qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC)
> return qp->attr.path_mtu;
> else
> - return RXE_PORT_MAX_MTU;
> + return IB_MTU_4096;
> }
>
> static inline int rcv_wqe_size(int max_sge)
> diff --git a/drivers/infiniband/sw/rxe/rxe_param.h b/drivers/infiniband/sw/rxe/rxe_param.h
> index 4555510d86c4..bdea899a58ac 100644
> --- a/drivers/infiniband/sw/rxe/rxe_param.h
> +++ b/drivers/infiniband/sw/rxe/rxe_param.h
> @@ -90,7 +90,6 @@ enum rxe_device_param {
> RXE_MAX_RES_RD_ATOM = 0x3f000,
> RXE_MAX_QP_INIT_RD_ATOM = 128,
> RXE_MAX_EE_INIT_RD_ATOM = 0,
> - RXE_ATOMIC_CAP = 1,
> RXE_MAX_EE = 0,
> RXE_MAX_RDD = 0,
> RXE_MAX_MW = 0,
> @@ -139,9 +138,6 @@ enum rxe_device_param {
>
> /* default/initial rxe port parameters */
> enum rxe_port_param {
> - RXE_PORT_STATE = IB_PORT_DOWN,
> - RXE_PORT_MAX_MTU = IB_MTU_4096,
> - RXE_PORT_ACTIVE_MTU = IB_MTU_256,
> RXE_PORT_GID_TBL_LEN = 1024,
> RXE_PORT_PORT_CAP_FLAGS = RDMA_CORE_CAP_PROT_ROCE_UDP_ENCAP,
> RXE_PORT_MAX_MSG_SZ = 0x800000,
> --
> 2.19.0
>
--
Thanks,
~Nick Desaulniers
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