[PATCH net-next v3 5/5] net: devlink: make the devlink_ops::info_get() callback optional

Vincent Mailhol
2022-11-27T13:11:38Z

Some drivers only reported the driver name in their
devlink_ops::info_get() callback. Now that the core provides this
information, the callback became empty. For such drivers, just
removing the callback would prevent the core from executing
devlink_nl_info_fill() meaning that "devlink dev info" would not
return anything.

Make the callback function optional by executing
devlink_nl_info_fill() even if devlink_ops::info_get() is NULL.

Remove all the empty devlink_ops::info_get() functions from the
drivers.

N.B.: the drivers with devlink support which previously did not
implement devlink_ops::info_get() will now also be able to report
the driver name.

Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
---
.../net/ethernet/fungible/funeth/funeth_devlink.c | 7 -------
.../net/ethernet/marvell/octeontx2/af/rvu_devlink.c | 7 -------
.../ethernet/marvell/octeontx2/nic/otx2_devlink.c | 8 --------
net/core/devlink.c | 13 ++++++-------
4 files changed, 6 insertions(+), 29 deletions(-)

diff --git a/drivers/net/ethernet/fungible/funeth/funeth_devlink.c b/drivers/net/ethernet/fungible/funeth/funeth_devlink.c
index 6668375edff6..4fbeb3fd71a8 100644
--- a/drivers/net/ethernet/fungible/funeth/funeth_devlink.c
+++ b/drivers/net/ethernet/fungible/funeth/funeth_devlink.c
@@ -3,14 +3,7 @@
#include "funeth.h"
#include "funeth_devlink.h"

-static int fun_dl_info_get(struct devlink *dl, struct devlink_info_req *req,
- struct netlink_ext_ack *extack)
-{
- return 0;
-}
-
static const struct devlink_ops fun_dl_ops = {
- .info_get = fun_dl_info_get,
};

struct devlink *fun_devlink_alloc(struct device *dev)
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
index f15439d26d21..bda1a6fa2ec4 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_devlink.c
@@ -1547,14 +1547,7 @@ static int rvu_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
return 0;
}

-static int rvu_devlink_info_get(struct devlink *devlink, struct devlink_info_req *req,
- struct netlink_ext_ack *extack)
-{
- return 0;
-}
-
static const struct devlink_ops rvu_devlink_ops = {
- .info_get = rvu_devlink_info_get,
.eswitch_mode_get = rvu_devlink_eswitch_mode_get,
.eswitch_mode_set = rvu_devlink_eswitch_mode_set,
};
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
index 5cc6416cf1a6..63ef7c41d18d 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c
@@ -77,15 +77,7 @@ static const struct devlink_param otx2_dl_params[] = {
otx2_dl_mcam_count_validate),
};

-static int otx2_devlink_info_get(struct devlink *devlink,
- struct devlink_info_req *req,
- struct netlink_ext_ack *extack)
-{
- return 0;
-}
-
static const struct devlink_ops otx2_devlink_ops = {
- .info_get = otx2_devlink_info_get,
};

int otx2_register_dl(struct otx2_nic *pfvf)
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 3babc16eeb6b..817d978bb729 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -6773,9 +6773,11 @@ devlink_nl_info_fill(struct sk_buff *msg, struct devlink *devlink,
goto err_cancel_msg;

req.msg = msg;
- err = devlink->ops->info_get(devlink, &req, extack);
- if (err)
- goto err_cancel_msg;
+ if (devlink->ops->info_get) {
+ err = devlink->ops->info_get(devlink, &req, extack);
+ if (err)
+ goto err_cancel_msg;
+ }

err = devlink_nl_driver_info_get(dev->driver, &req);
if (err)
@@ -6796,9 +6798,6 @@ static int devlink_nl_cmd_info_get_doit(struct sk_buff *skb,
struct sk_buff *msg;
int err;

- if (!devlink->ops->info_get)
- return -EOPNOTSUPP;
-
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
@@ -6824,7 +6823,7 @@ static int devlink_nl_cmd_info_get_dumpit(struct sk_buff *msg,
int err = 0;

devlinks_xa_for_each_registered_get(sock_net(msg->sk), index, devlink) {
- if (idx < start || !devlink->ops->info_get)
+ if (idx < start)
goto inc;

devl_lock(devlink);
--
2.37.4