/* ensure the originating sk reference is available on driver level */
SKBTX_DRV_NEEDS_SK_REF = 1 << 3,
+
+ /* device driver supports TX zero-copy buffers */
+ SKBTX_DEV_ZEROCOPY = 1 << 4,
+};
+
+/*
+ * The callback notifies userspace to release buffers when skb DMA is done in
+ * lower device, the skb last reference should be 0 when calling this.
+ * The desc is used to track userspace buffer index.
+ */
+struct ubuf_info {
+ void (*callback)(void *);
+ void *arg;
+ unsigned long desc;
};
/* This data is invariant across clones and lives at
/* Intermediate layers must ensure that destructor_arg
* remains valid until skb destructor */
void * destructor_arg;
+
/* must be last field, see pskb_expand_head() */
skb_frag_t frags[MAX_SKB_FRAGS];
};
* struct sk_buff - socket buffer
* @next: Next buffer in list
* @prev: Previous buffer in list
- * @sk: Socket we are owned by
* @tstamp: Time we arrived
+ * @sk: Socket we are owned by
* @dev: Device we arrived on/are leaving by
- * @transport_header: Transport layer header
- * @network_header: Network layer header
- * @mac_header: Link layer header
+ * @cb: Control buffer. Free for use by every layer. Put private vars here
* @_skb_refdst: destination entry (with norefcount bit)
* @sp: the security path, used for xfrm
- * @cb: Control buffer. Free for use by every layer. Put private vars here
* @len: Length of actual data
* @data_len: Data length
* @mac_len: Length of link layer header
* @csum: Checksum (must include start/offset pair)
* @csum_start: Offset from skb->head where checksumming should start
* @csum_offset: Offset from csum_start where checksum should be stored
+ * @priority: Packet queueing priority
* @local_df: allow local fragmentation
* @cloned: Head may be cloned (check refcnt to be sure)
+ * @ip_summed: Driver fed us an IP checksum
* @nohdr: Payload reference only, must not modify header
+ * @nfctinfo: Relationship of this skb to the connection
* @pkt_type: Packet class
* @fclone: skbuff clone status
- * @ip_summed: Driver fed us an IP checksum
- * @priority: Packet queueing priority
- * @users: User count - see {datagram,tcp}.c
- * @protocol: Packet protocol from driver
- * @truesize: Buffer size
- * @head: Head of buffer
- * @data: Data head pointer
- * @tail: Tail pointer
- * @end: End pointer
- * @destructor: Destruct function
- * @mark: Generic packet mark
- * @nfct: Associated connection, if any
* @ipvs_property: skbuff is owned by ipvs
* @peeked: this packet has been seen already, so stats have been
* done for it, don't do them again
* @nf_trace: netfilter packet trace flag
- * @nfctinfo: Relationship of this skb to the connection
+ * @protocol: Packet protocol from driver
+ * @destructor: Destruct function
+ * @nfct: Associated connection, if any
* @nfct_reasm: netfilter conntrack re-assembly pointer
* @nf_bridge: Saved data about a bridged frame - see br_netfilter.c
* @skb_iif: ifindex of device we arrived on
- * @rxhash: the packet hash computed on receive
- * @queue_mapping: Queue mapping for multiqueue devices
* @tc_index: Traffic control index
* @tc_verd: traffic control verdict
+ * @rxhash: the packet hash computed on receive
+ * @queue_mapping: Queue mapping for multiqueue devices
* @ndisc_nodetype: router type (from link layer)
+ * @ooo_okay: allow the mapping of a socket to a queue to be changed
* @dma_cookie: a cookie to one of several possible DMA operations
* done by skb DMA functions
* @secmark: security marking
+ * @mark: Generic packet mark
+ * @dropcount: total number of sk_receive_queue overflows
* @vlan_tci: vlan tag control information
+ * @transport_header: Transport layer header
+ * @network_header: Network layer header
+ * @mac_header: Link layer header
+ * @tail: Tail pointer
+ * @end: End pointer
+ * @head: Head of buffer
+ * @data: Data head pointer
+ * @truesize: Buffer size
+ * @users: User count - see {datagram,tcp}.c
*/
struct sk_buff {
skb->tail += len;
}
+static inline void skb_reset_mac_len(struct sk_buff *skb)
+{
+ skb->mac_len = skb->network_header - skb->mac_header;
+}
+
#ifdef NET_SKBUFF_DATA_USES_OFFSET
static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
{
return __netdev_alloc_skb(dev, length, GFP_ATOMIC);
}
-static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev,
- unsigned int length)
+static inline struct sk_buff *__netdev_alloc_skb_ip_align(struct net_device *dev,
+ unsigned int length, gfp_t gfp)
{
- struct sk_buff *skb = netdev_alloc_skb(dev, length + NET_IP_ALIGN);
+ struct sk_buff *skb = __netdev_alloc_skb(dev, length + NET_IP_ALIGN, gfp);
if (NET_IP_ALIGN && skb)
skb_reserve(skb, NET_IP_ALIGN);
return skb;
}
+static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev,
+ unsigned int length)
+{
+ return __netdev_alloc_skb_ip_align(dev, length, GFP_ATOMIC);
+}
+
/**
* __netdev_alloc_page - allocate a page for ps-rx on a specific device
* @dev: network device to receive on
* skb_tx_timestamp() - Driver hook for transmit timestamping
*
* Ethernet MAC Drivers should call this function in their hard_xmit()
- * function as soon as possible after giving the sk_buff to the MAC
- * hardware, but before freeing the sk_buff.
+ * function immediately before giving the sk_buff to the MAC hardware.
*
* @skb: A socket buffer.
*/
}
bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off);
+
#endif /* __KERNEL__ */
#endif /* _LINUX_SKBUFF_H */
projects / firefly-linux-kernel-4.4.55.git / blobdiff