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Message-Id: <1308708650-25509-2-git-send-email-loke.chetan@gmail.com>
Date: Tue, 21 Jun 2011 22:10:49 -0400
From: Chetan Loke <loke.chetan@...il.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, eric.dumazet@...il.com, joe@...ches.com,
bhutchings@...arflare.com, shemminger@...tta.com,
linux-kernel@...r.kernel.org, Chetan Loke <loke.chetan@...il.com>
Subject: [PATCH v2 net-next af-packet 1/2] Enhance af-packet to provide (near zero)lossless packet capture functionality.
Added TPACKET_V3 definitions
Signed-off-by: Chetan Loke <loke.chetan@...il.com>
---
include/linux/if_packet.h | 128 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 128 insertions(+), 0 deletions(-)
diff --git a/include/linux/if_packet.h b/include/linux/if_packet.h
index 6d66ce1..e5fad08 100644
--- a/include/linux/if_packet.h
+++ b/include/linux/if_packet.h
@@ -55,6 +55,17 @@ 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;
@@ -71,6 +82,7 @@ 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
@@ -102,12 +114,114 @@ struct tpacket2_hdr {
__u32 tp_nsec;
__u16 tp_vlan_tci;
};
+struct tpacket3_hdr {
+ __u32 tp_status;
+ __u32 tp_len;
+ __u32 tp_snaplen;
+ __u16 tp_mac;
+ __u16 tp_net;
+ __u32 tp_sec;
+ __u32 tp_nsec;
+ __u16 tp_vlan_tci;
+ __u16 tp_padding;
+ __u32 tp_next_offset;
+};
+
+struct bd_ts {
+ unsigned int ts_sec;
+ union {
+ struct {
+ unsigned int ts_usec;
+ };
+ struct {
+ unsigned int ts_nsec;
+ };
+ };
+} __attribute__ ((__packed__));
+
+struct bd_v1 {
+ /*
+ * If you re-order the first 5 fields then
+ * the BLOCK_XXX macros will NOT work.
+ */
+ __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.
+ */
+ __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;
+ struct bd_ts ts_last_pkt;
+} __attribute__ ((__packed__));
+
+struct block_desc {
+ __u16 version;
+ __u16 offset_to_priv;
+ union {
+ struct {
+ __u32 words[4];
+ __u64 dword;
+ } __attribute__ ((__packed__));
+ struct bd_v1 bd1;
+ };
+} __attribute__ ((__packed__));
+
+
#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))
+
+#define BLOCK_STATUS(x) ((x)->words[0])
+#define BLOCK_NUM_PKTS(x) ((x)->words[1])
+#define BLOCK_O2FP(x) ((x)->words[2])
+#define BLOCK_LEN(x) ((x)->words[3])
+#define BLOCK_SNUM(x) ((x)->dword)
+#define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
+#define BLOCK_PRIV(x) ((void *)((char *)(x) + BLOCK_O2PRIV(x)))
enum tpacket_versions {
TPACKET_V1,
TPACKET_V2,
+ TPACKET_V3,
};
/*
@@ -130,6 +244,20 @@ 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; /* size of private data area */
+};
+
+union tpacket_req_u {
+ struct tpacket_req req;
+ struct tpacket_req3 req3;
+};
+
struct packet_mreq {
int mr_ifindex;
unsigned short mr_type;
--
1.7.5.2
--
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