af-packet: Added TPACKET_V3 headers.

Added TPACKET_V3 definitions.

Signed-off-by: Chetan Loke <loke.chetan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 119 insertions, 0 deletions

diff --git a/include/linux/if_packet.h b/include/linux/if_packet.h
index c1486060f5ed..5926d59c4295 100644
--- a/include/linux/if_packet.h
+++ b/include/linux/if_packet.h
@@ -61,6 +61,17 @@ struct tpacket_stats {
         unsigned int    tp_drops;
 };
 
+struct tpacket_stats_v3 {
+        unsigned int    tp_packets;
+        unsigned int    tp_drops;
+        unsigned int    tp_freeze_q_cnt;
+};
+
+union tpacket_stats_u {
+        struct tpacket_stats stats1;
+        struct tpacket_stats_v3 stats3;
+};
+
 struct tpacket_auxdata {
         __u32           tp_status;
         __u32           tp_len;
@@ -78,6 +89,7 @@ struct tpacket_auxdata {
 #define TP_STATUS_LOSING        0x4
 #define TP_STATUS_CSUMNOTREADY  0x8
 #define TP_STATUS_VLAN_VALID   0x10 /* auxdata has valid tp_vlan_tci */
+#define TP_STATUS_BLK_TMO       0x20
 
 /* Tx ring - header status */
 #define TP_STATUS_AVAILABLE     0x0
@@ -85,6 +97,9 @@ struct tpacket_auxdata {
 #define TP_STATUS_SENDING       0x2
 #define TP_STATUS_WRONG_FORMAT  0x4
 
+/* Rx ring - feature request bits */
+#define TP_FT_REQ_FILL_RXHASH   0x1
+
 struct tpacket_hdr {
         unsigned long   tp_status;
         unsigned int    tp_len;
@@ -111,11 +126,100 @@ struct tpacket2_hdr {
         __u16           tp_padding;
 };
 
+struct hdr_variant1 {
+        __u32   tp_rxhash;
+        __u32   tp_vlan_tci;
+};
+
+struct tpacket3_hdr {
+        __u32           tp_next_offset;
+        __u32           tp_sec;
+        __u32           tp_nsec;
+        __u32           tp_snaplen;
+        __u32           tp_len;
+        __u32           tp_status;
+        __u16           tp_mac;
+        __u16           tp_net;
+        /* pkt_hdr variants */
+        union {
+                struct hdr_variant1 hv1;
+        };
+};
+
+struct bd_ts {
+        unsigned int ts_sec;
+        union {
+                unsigned int ts_usec;
+                unsigned int ts_nsec;
+        };
+};
+
+struct hdr_v1 {
+        __u32   block_status;
+        __u32   num_pkts;
+        __u32   offset_to_first_pkt;
+
+        /* Number of valid bytes (including padding)
+         * blk_len <= tp_block_size
+         */
+        __u32   blk_len;
+
+        /*
+         * Quite a few uses of sequence number:
+         * 1. Make sure cache flush etc worked.
+         *    Well, one can argue - why not use the increasing ts below?
+         *    But look at 2. below first.
+         * 2. When you pass around blocks to other user space decoders,
+         *    you can see which blk[s] is[are] outstanding etc.
+         * 3. Validate kernel code.
+         */
+        aligned_u64     seq_num;
+
+        /*
+         * ts_last_pkt:
+         *
+         * Case 1.      Block has 'N'(N >=1) packets and TMO'd(timed out)
+         *              ts_last_pkt == 'time-stamp of last packet' and NOT the
+         *              time when the timer fired and the block was closed.
+         *              By providing the ts of the last packet we can absolutely
+         *              guarantee that time-stamp wise, the first packet in the
+         *              next block will never precede the last packet of the
+         *              previous block.
+         * Case 2.      Block has zero packets and TMO'd
+         *              ts_last_pkt = time when the timer fired and the block
+         *              was closed.
+         * Case 3.      Block has 'N' packets and NO TMO.
+         *              ts_last_pkt = time-stamp of the last pkt in the block.
+         *
+         * ts_first_pkt:
+         *              Is always the time-stamp when the block was opened.
+         *              Case a) ZERO packets
+         *                      No packets to deal with but atleast you know the
+         *                      time-interval of this block.
+         *              Case b) Non-zero packets
+         *                      Use the ts of the first packet in the block.
+         *
+         */
+        struct bd_ts    ts_first_pkt, ts_last_pkt;
+};
+
+union bd_header_u {
+        struct hdr_v1 bh1;
+};
+
+struct block_desc {
+        __u32 version;
+        __u32 offset_to_priv;
+        union bd_header_u hdr;
+};
+
 #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
 };
 
 /*
@@ -138,6 +242,21 @@ struct tpacket_req {
         unsigned int    tp_frame_nr;    /* Total number of frames */
 };
 
+struct tpacket_req3 {
+        unsigned int    tp_block_size;  /* Minimal size of contiguous block */
+        unsigned int    tp_block_nr;    /* Number of blocks */
+        unsigned int    tp_frame_size;  /* Size of frame */
+        unsigned int    tp_frame_nr;    /* Total number of frames */
+        unsigned int    tp_retire_blk_tov; /* timeout in msecs */
+        unsigned int    tp_sizeof_priv; /* offset to private data area */
+        unsigned int    tp_feature_req_word;
+};
+
+union tpacket_req_u {
+        struct tpacket_req      req;
+        struct tpacket_req3     req3;
+};
+
 struct packet_mreq {
         int             mr_ifindex;
         unsigned short  mr_type;