From: Björn Töpel <bjorn.to...@intel.com>
This patch adds the necessary AF_PACKET V4 structures for usage from
userspace. AF_PACKET V4 is a new interface optimized for high
performance packet processing.
Signed-off-by: Björn Töpel <bjorn.to...@intel.com>
---
include/uapi/linux/if_packet.h | 65 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 64 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/if_packet.h b/include/uapi/linux/if_packet.h
index 4df96a7dd4fa..8eabcd1b370a 100644
--- a/include/uapi/linux/if_packet.h
+++ b/include/uapi/linux/if_packet.h
@@ -56,6 +56,8 @@ struct sockaddr_ll {
#define PACKET_QDISC_BYPASS 20
#define PACKET_ROLLOVER_STATS 21
#define PACKET_FANOUT_DATA 22
+#define PACKET_MEMREG 23
+#define PACKET_ZEROCOPY 24
#define PACKET_FANOUT_HASH 0
#define PACKET_FANOUT_LB 1
@@ -243,13 +245,35 @@ struct tpacket_block_desc {
union tpacket_bd_header_u hdr;
};
+#define TP4_DESC_KERNEL 0x0080 /* The descriptor is owned by the kernel
*/
+#define TP4_PKT_CONT 1 /* The packet continues in the next descriptor */
+
+struct tpacket4_desc {
+ __u32 idx;
+ __u32 len;
+ __u16 offset;
+ __u8 error; /* an errno */
+ __u8 flags;
+ __u8 padding[4];
+};
+
+struct tpacket4_queue {
+ struct tpacket4_desc *ring;
+
+ unsigned int avail_idx;
+ unsigned int last_used_idx;
+ unsigned int num_free;
+ unsigned int ring_mask;
+};
+
#define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct
tpacket2_hdr)) + sizeof(struct sockaddr_ll))
#define TPACKET3_HDRLEN (TPACKET_ALIGN(sizeof(struct
tpacket3_hdr)) + sizeof(struct sockaddr_ll))
enum tpacket_versions {
TPACKET_V1,
TPACKET_V2,
- TPACKET_V3
+ TPACKET_V3,
+ TPACKET_V4
};
/*
@@ -282,9 +306,26 @@ struct tpacket_req3 {
unsigned int tp_feature_req_word;
};
+/* V4 frame structure
+ *
+ * The v4 frame is contained within a frame defined by
+ * PACKET_MEMREG/struct tpacket_memreg_req. Each frame is frame_size
+ * bytes, and laid out as following:
+ *
+ * - Start.
+ * - Gap, at least data_headroom (from struct tpacket_memreg_req),
+ * chosen so that packet data (Start+data) is at least 64B aligned.
+ */
+
+struct tpacket_req4 {
+ int mr_fd; /* File descriptor for registered buffers */
+ unsigned int desc_nr; /* Number of entries in descriptor ring */
+};
+
union tpacket_req_u {
struct tpacket_req req;
struct tpacket_req3 req3;
+ struct tpacket_req4 req4;
};
struct packet_mreq {
@@ -294,6 +335,28 @@ struct packet_mreq {
unsigned char mr_address[8];
};
+/*
+ * struct tpacket_memreg_req is used in conjunction with PACKET_MEMREG
+ * to register user memory which should be used to store the packet
+ * data.
+ *
+ * There are some constraints for the memory being registered:
+ * - The memory area has to be memory page size aligned.
+ * - The frame size has to be a power of 2.
+ * - The frame size cannot be smaller than 2048B.
+ * - The frame size cannot be larger than the memory page size.
+ *
+ * Corollary: The number of frames that can be stored is
+ * len / frame_size.
+ *
+ */
+struct tpacket_memreg_req {
+ unsigned long addr; /* Start of packet data area */
+ unsigned long len; /* Length of packet data area */
+ unsigned int frame_size; /* Frame size */
+ unsigned int data_headroom; /* Frame head room */
+};
+
#define PACKET_MR_MULTICAST 0
#define PACKET_MR_PROMISC 1
#define PACKET_MR_ALLMULTI 2
--
2.11.0
