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Date: Sun, 15 May 2022 21:17:04 +0200 From: Oliver Hartkopp <socketcan@...tkopp.net> To: Vincent Mailhol <mailhol.vincent@...adoo.fr>, Marc Kleine-Budde <mkl@...gutronix.de> Cc: linux-can@...r.kernel.org, linux-kernel@...r.kernel.org, Max Staudt <max@...as.org>, netdev@...r.kernel.org Subject: Re: [PATCH v3 3/4] can: skb:: move can_dropped_invalid_skb and can_skb_headroom_valid to skb.c Hi Vincent, On 14.05.22 16:16, Vincent Mailhol wrote: > The functions can_dropped_invalid_skb() and can_skb_headroom_valid() > grew a lot over the years to a point which it does not make much sense > to have them defined as static inline in header files. Move those two > functions to the .c counterpart of skb.h. > > can_skb_headroom_valid() only caller being can_dropped_invalid_skb(), > the declaration is removed from the header. Only > can_dropped_invalid_skb() gets its symbol exported. I can see your point but the need for can-dev was always given for hardware specific stuff like bitrates, TDC, transceivers, whatever. As there would be more things in slcan (e.g. dev_alloc_skb() could be unified with alloc_can_skb()) - would it probably make sense to introduce a new can-skb module that could be used by all CAN virtual/software interfaces? Or some other split-up ... any idea? Best regards, Oliver > > While doing so, do a small cleanup: add brackets around the else block > in can_dropped_invalid_skb(). > > Signed-off-by: Vincent Mailhol <mailhol.vincent@...adoo.fr> > --- > drivers/net/can/dev/skb.c | 58 ++++++++++++++++++++++++++++++++++++++ > include/linux/can/skb.h | 59 +-------------------------------------- > 2 files changed, 59 insertions(+), 58 deletions(-) > > diff --git a/drivers/net/can/dev/skb.c b/drivers/net/can/dev/skb.c > index 61660248c69e..8b1991130de5 100644 > --- a/drivers/net/can/dev/skb.c > +++ b/drivers/net/can/dev/skb.c > @@ -252,3 +252,61 @@ struct sk_buff *alloc_can_err_skb(struct net_device *dev, struct can_frame **cf) > return skb; > } > EXPORT_SYMBOL_GPL(alloc_can_err_skb); > + > +/* Check for outgoing skbs that have not been created by the CAN subsystem */ > +static bool can_skb_headroom_valid(struct net_device *dev, struct sk_buff *skb) > +{ > + /* af_packet creates a headroom of HH_DATA_MOD bytes which is fine */ > + if (WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct can_skb_priv))) > + return false; > + > + /* af_packet does not apply CAN skb specific settings */ > + if (skb->ip_summed == CHECKSUM_NONE) { > + /* init headroom */ > + can_skb_prv(skb)->ifindex = dev->ifindex; > + can_skb_prv(skb)->skbcnt = 0; > + > + skb->ip_summed = CHECKSUM_UNNECESSARY; > + > + /* perform proper loopback on capable devices */ > + if (dev->flags & IFF_ECHO) > + skb->pkt_type = PACKET_LOOPBACK; > + else > + skb->pkt_type = PACKET_HOST; > + > + skb_reset_mac_header(skb); > + skb_reset_network_header(skb); > + skb_reset_transport_header(skb); > + } > + > + return true; > +} > + > +/* Drop a given socketbuffer if it does not contain a valid CAN frame. */ > +bool can_dropped_invalid_skb(struct net_device *dev, struct sk_buff *skb) > +{ > + const struct canfd_frame *cfd = (struct canfd_frame *)skb->data; > + > + if (skb->protocol == htons(ETH_P_CAN)) { > + if (unlikely(skb->len != CAN_MTU || > + cfd->len > CAN_MAX_DLEN)) > + goto inval_skb; > + } else if (skb->protocol == htons(ETH_P_CANFD)) { > + if (unlikely(skb->len != CANFD_MTU || > + cfd->len > CANFD_MAX_DLEN)) > + goto inval_skb; > + } else { > + goto inval_skb; > + } > + > + if (!can_skb_headroom_valid(dev, skb)) > + goto inval_skb; > + > + return false; > + > +inval_skb: > + kfree_skb(skb); > + dev->stats.tx_dropped++; > + return true; > +} > +EXPORT_SYMBOL_GPL(can_dropped_invalid_skb); > diff --git a/include/linux/can/skb.h b/include/linux/can/skb.h > index fdb22b00674a..182749e858b3 100644 > --- a/include/linux/can/skb.h > +++ b/include/linux/can/skb.h > @@ -31,6 +31,7 @@ struct sk_buff *alloc_canfd_skb(struct net_device *dev, > struct canfd_frame **cfd); > struct sk_buff *alloc_can_err_skb(struct net_device *dev, > struct can_frame **cf); > +bool can_dropped_invalid_skb(struct net_device *dev, struct sk_buff *skb); > > /* > * The struct can_skb_priv is used to transport additional information along > @@ -96,64 +97,6 @@ static inline struct sk_buff *can_create_echo_skb(struct sk_buff *skb) > return nskb; > } > > -/* Check for outgoing skbs that have not been created by the CAN subsystem */ > -static inline bool can_skb_headroom_valid(struct net_device *dev, > - struct sk_buff *skb) > -{ > - /* af_packet creates a headroom of HH_DATA_MOD bytes which is fine */ > - if (WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct can_skb_priv))) > - return false; > - > - /* af_packet does not apply CAN skb specific settings */ > - if (skb->ip_summed == CHECKSUM_NONE) { > - /* init headroom */ > - can_skb_prv(skb)->ifindex = dev->ifindex; > - can_skb_prv(skb)->skbcnt = 0; > - > - skb->ip_summed = CHECKSUM_UNNECESSARY; > - > - /* perform proper loopback on capable devices */ > - if (dev->flags & IFF_ECHO) > - skb->pkt_type = PACKET_LOOPBACK; > - else > - skb->pkt_type = PACKET_HOST; > - > - skb_reset_mac_header(skb); > - skb_reset_network_header(skb); > - skb_reset_transport_header(skb); > - } > - > - return true; > -} > - > -/* Drop a given socketbuffer if it does not contain a valid CAN frame. */ > -static inline bool can_dropped_invalid_skb(struct net_device *dev, > - struct sk_buff *skb) > -{ > - const struct canfd_frame *cfd = (struct canfd_frame *)skb->data; > - > - if (skb->protocol == htons(ETH_P_CAN)) { > - if (unlikely(skb->len != CAN_MTU || > - cfd->len > CAN_MAX_DLEN)) > - goto inval_skb; > - } else if (skb->protocol == htons(ETH_P_CANFD)) { > - if (unlikely(skb->len != CANFD_MTU || > - cfd->len > CANFD_MAX_DLEN)) > - goto inval_skb; > - } else > - goto inval_skb; > - > - if (!can_skb_headroom_valid(dev, skb)) > - goto inval_skb; > - > - return false; > - > -inval_skb: > - kfree_skb(skb); > - dev->stats.tx_dropped++; > - return true; > -} > - > static inline bool can_is_canfd_skb(const struct sk_buff *skb) > { > /* the CAN specific type of skb is identified by its data length */
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