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Groups > linux.kernel > #1438857
| From | Kamal Mostafa <kamal@canonical.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.19.y-ckt 42/99] can: fix handling of unmodifiable configuration options |
| Date | 2016-07-07 21:00 +0200 |
| Message-ID | <rSmGK-2kd-37@gated-at.bofh.it> (permalink) |
| References | <rSmnn-2ax-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
3.19.8-ckt23 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Oliver Hartkopp <socketcan@hartkopp.net>
commit bb208f144cf3f59d8f89a09a80efd04389718907 upstream.
As described in 'can: m_can: tag current CAN FD controllers as non-ISO'
(6cfda7fbebe) it is possible to define fixed configuration options by
setting the according bit in 'ctrlmode' and clear it in 'ctrlmode_supported'.
This leads to the incovenience that the fixed configuration bits can not be
passed by netlink even when they have the correct values (e.g. non-ISO, FD).
This patch fixes that issue and not only allows fixed set bit values to be set
again but now requires(!) to provide these fixed values at configuration time.
A valid CAN FD configuration consists of a nominal/arbitration bittiming, a
data bittiming and a control mode with CAN_CTRLMODE_FD set - which is now
enforced by a new can_validate() function. This fix additionally removed the
inconsistency that was prohibiting the support of 'CANFD-only' controller
drivers, like the RCar CAN FD.
For this reason a new helper can_set_static_ctrlmode() has been introduced to
provide a proper interface to handle static enabled CAN controller options.
Reported-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Reviewed-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
drivers/net/can/dev.c | 56 +++++++++++++++++++++++++++++++++++++++----
drivers/net/can/m_can/m_can.c | 2 +-
include/linux/can/dev.h | 22 +++++++++++++++--
3 files changed, 73 insertions(+), 7 deletions(-)
diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index 8202ab3..8fa4d9e 100644
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -693,11 +693,17 @@ int can_change_mtu(struct net_device *dev, int new_mtu)
/* allow change of MTU according to the CANFD ability of the device */
switch (new_mtu) {
case CAN_MTU:
+ /* 'CANFD-only' controllers can not switch to CAN_MTU */
+ if (priv->ctrlmode_static & CAN_CTRLMODE_FD)
+ return -EINVAL;
+
priv->ctrlmode &= ~CAN_CTRLMODE_FD;
break;
case CANFD_MTU:
- if (!(priv->ctrlmode_supported & CAN_CTRLMODE_FD))
+ /* check for potential CANFD ability */
+ if (!(priv->ctrlmode_supported & CAN_CTRLMODE_FD) &&
+ !(priv->ctrlmode_static & CAN_CTRLMODE_FD))
return -EINVAL;
priv->ctrlmode |= CAN_CTRLMODE_FD;
@@ -779,6 +785,35 @@ static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = {
= { .len = sizeof(struct can_bittiming_const) },
};
+static int can_validate(struct nlattr *tb[], struct nlattr *data[])
+{
+ bool is_can_fd = false;
+
+ /* Make sure that valid CAN FD configurations always consist of
+ * - nominal/arbitration bittiming
+ * - data bittiming
+ * - control mode with CAN_CTRLMODE_FD set
+ */
+
+ if (data[IFLA_CAN_CTRLMODE]) {
+ struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]);
+
+ is_can_fd = cm->flags & cm->mask & CAN_CTRLMODE_FD;
+ }
+
+ if (is_can_fd) {
+ if (!data[IFLA_CAN_BITTIMING] || !data[IFLA_CAN_DATA_BITTIMING])
+ return -EOPNOTSUPP;
+ }
+
+ if (data[IFLA_CAN_DATA_BITTIMING]) {
+ if (!is_can_fd || !data[IFLA_CAN_BITTIMING])
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+
static int can_changelink(struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
{
@@ -810,19 +845,31 @@ static int can_changelink(struct net_device *dev,
if (data[IFLA_CAN_CTRLMODE]) {
struct can_ctrlmode *cm;
+ u32 ctrlstatic;
+ u32 maskedflags;
/* Do not allow changing controller mode while running */
if (dev->flags & IFF_UP)
return -EBUSY;
cm = nla_data(data[IFLA_CAN_CTRLMODE]);
+ ctrlstatic = priv->ctrlmode_static;
+ maskedflags = cm->flags & cm->mask;
+
+ /* check whether provided bits are allowed to be passed */
+ if (cm->mask & ~(priv->ctrlmode_supported | ctrlstatic))
+ return -EOPNOTSUPP;
+
+ /* do not check for static fd-non-iso if 'fd' is disabled */
+ if (!(maskedflags & CAN_CTRLMODE_FD))
+ ctrlstatic &= ~CAN_CTRLMODE_FD_NON_ISO;
- /* check whether changed bits are allowed to be modified */
- if (cm->mask & ~priv->ctrlmode_supported)
+ /* make sure static options are provided by configuration */
+ if ((maskedflags & ctrlstatic) != ctrlstatic)
return -EOPNOTSUPP;
/* clear bits to be modified and copy the flag values */
priv->ctrlmode &= ~cm->mask;
- priv->ctrlmode |= (cm->flags & cm->mask);
+ priv->ctrlmode |= maskedflags;
/* CAN_CTRLMODE_FD can only be set when driver supports FD */
if (priv->ctrlmode & CAN_CTRLMODE_FD)
@@ -963,6 +1010,7 @@ static struct rtnl_link_ops can_link_ops __read_mostly = {
.maxtype = IFLA_CAN_MAX,
.policy = can_policy,
.setup = can_setup,
+ .validate = can_validate,
.newlink = can_newlink,
.changelink = can_changelink,
.get_size = can_get_size,
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 2445298..62143cd 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -957,7 +957,7 @@ static struct net_device *alloc_m_can_dev(void)
priv->can.do_get_berr_counter = m_can_get_berr_counter;
/* CAN_CTRLMODE_FD_NON_ISO is fixed with M_CAN IP v3.0.1 */
- priv->can.ctrlmode = CAN_CTRLMODE_FD_NON_ISO;
+ can_set_static_ctrlmode(dev, CAN_CTRLMODE_FD_NON_ISO);
/* CAN_CTRLMODE_FD_NON_ISO can not be changed with M_CAN IP v3.0.1 */
priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index c05ff0f..a48d7b6 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -39,8 +39,11 @@ struct can_priv {
struct can_clock clock;
enum can_state state;
- u32 ctrlmode;
- u32 ctrlmode_supported;
+
+ /* CAN controller features - see include/uapi/linux/can/netlink.h */
+ u32 ctrlmode; /* current options setting */
+ u32 ctrlmode_supported; /* options that can be modified by netlink */
+ u32 ctrlmode_static; /* static enabled options for driver/hardware */
int restart_ms;
struct timer_list restart_timer;
@@ -105,6 +108,21 @@ static inline bool can_is_canfd_skb(const struct sk_buff *skb)
return skb->len == CANFD_MTU;
}
+/* helper to define static CAN controller features at device creation time */
+static inline void can_set_static_ctrlmode(struct net_device *dev,
+ u32 static_mode)
+{
+ struct can_priv *priv = netdev_priv(dev);
+
+ /* alloc_candev() succeeded => netdev_priv() is valid at this point */
+ priv->ctrlmode = static_mode;
+ priv->ctrlmode_static = static_mode;
+
+ /* override MTU which was set by default in can_setup()? */
+ if (static_mode & CAN_CTRLMODE_FD)
+ dev->mtu = CANFD_MTU;
+}
+
/* get data length from can_dlc with sanitized can_dlc */
u8 can_dlc2len(u8 can_dlc);
--
2.7.4
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[PATCH 3.19.y-ckt 04/99] ath10k: fix debugfs pktlog_filter write Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 02/99] ath10k: fix firmware assert in monitor mode Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 19/99] ath9k: Fix LED polarity for some Mini PCI AR9220 MB92 cards. Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 11/99] scsi: Add intermediate STARGET_REMOVE state to scsi_target_state Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 15/99] powerpc/book3s64: Fix branching to OOL handlers in relocatable kernel Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 31/99] USB: serial: option: add support for Cinterion PH8 and AHxx Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 13/99] usb: f_mass_storage: test whether thread is running before starting another Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 27/99] ext4: fix hang when processing corrupted orphaned inode list Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
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