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authorJohann Baudy <johann.baudy@gnu-log.net>2009-05-18 22:11:22 -0700
committerDavid S. Miller <davem@davemloft.net>2009-05-18 22:11:22 -0700
commit69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 (patch)
tree24920f17ea435627978af9d5fe0e99763bf6a533 /include
parentf67f34084914144de55c785163d047d5d8dddd2d (diff)
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net: TX_RING and packet mmap
New packet socket feature that makes packet socket more efficient for transmission. - It reduces number of system call through a PACKET_TX_RING mechanism, based on PACKET_RX_RING (Circular buffer allocated in kernel space which is mmapped from user space). - It minimizes CPU copy using fragmented SKB (almost zero copy). Signed-off-by: Johann Baudy <johann.baudy@gnu-log.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/if_packet.h20
-rw-r--r--include/linux/skbuff.h3
2 files changed, 18 insertions, 5 deletions
diff --git a/include/linux/if_packet.h b/include/linux/if_packet.h
index 18db0668065..5b2badeb949 100644
--- a/include/linux/if_packet.h
+++ b/include/linux/if_packet.h
@@ -46,6 +46,8 @@ struct sockaddr_ll
#define PACKET_VERSION 10
#define PACKET_HDRLEN 11
#define PACKET_RESERVE 12
+#define PACKET_TX_RING 13
+#define PACKET_LOSS 14
struct tpacket_stats
{
@@ -63,14 +65,22 @@ struct tpacket_auxdata
__u16 tp_vlan_tci;
};
+/* Rx ring - header status */
+#define TP_STATUS_KERNEL 0x0
+#define TP_STATUS_USER 0x1
+#define TP_STATUS_COPY 0x2
+#define TP_STATUS_LOSING 0x4
+#define TP_STATUS_CSUMNOTREADY 0x8
+
+/* Tx ring - header status */
+#define TP_STATUS_AVAILABLE 0x0
+#define TP_STATUS_SEND_REQUEST 0x1
+#define TP_STATUS_SENDING 0x2
+#define TP_STATUS_WRONG_FORMAT 0x4
+
struct tpacket_hdr
{
unsigned long tp_status;
-#define TP_STATUS_KERNEL 0
-#define TP_STATUS_USER 1
-#define TP_STATUS_COPY 2
-#define TP_STATUS_LOSING 4
-#define TP_STATUS_CSUMNOTREADY 8
unsigned int tp_len;
unsigned int tp_snaplen;
unsigned short tp_mac;
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 1b5c3d298f4..aff494ba6a3 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -203,6 +203,9 @@ struct skb_shared_info {
#ifdef CONFIG_HAS_DMA
dma_addr_t dma_maps[MAX_SKB_FRAGS + 1];
#endif
+ /* Intermediate layers must ensure that destructor_arg
+ * remains valid until skb destructor */
+ void * destructor_arg;
};
/* We divide dataref into two halves. The higher 16 bits hold references