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net/tls: add device decrypted trace point 

Add a tracepoint to the TLS offload's fast path. This tracepoint
can be used to track the decrypted and encrypted status of received
records. Records decrypted by the device should have decrypted set
to 1, records which have neither decrypted nor decrypted set are
partially decrypted, require re-encryption and therefore are most
expensive to deal with.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2019-10-04 16:19:23 -07:00 committed by David S. Miller
parent 8538d29cea
commit 9ec1c6ac27
2 changed files with 38 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
net/tls/tls_device.c
View File

@ -850,6 +850,7 @@ int tls_device_decrypted(struct sock *sk, struct sk_buff *skb)
{
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct tls_offload_context_rx *ctx = tls_offload_ctx_rx(tls_ctx);
struct strp_msg *rxm = strp_msg(skb);
int is_decrypted = skb->decrypted;
int is_encrypted = !is_decrypted;
struct sk_buff *skb_iter;
@ -860,6 +861,10 @@ int tls_device_decrypted(struct sock *sk, struct sk_buff *skb)
is_encrypted &= !skb_iter->decrypted;
}
trace_tls_device_decrypted(sk, tcp_sk(sk)->copied_seq - rxm->full_len,
tls_ctx->rx.rec_seq, rxm->full_len,
is_encrypted, is_decrypted);
ctx->sw.decrypted |= is_decrypted;
/* Return immediately if the record is either entirely plaintext or

33
net/tls/trace.h
View File

@ -41,6 +41,39 @@ TRACE_EVENT(tls_device_offload_set,
)
);
TRACE_EVENT(tls_device_decrypted,
TP_PROTO(struct sock *sk, u32 tcp_seq, u8 *rec_no, u32 rec_len,
bool encrypted, bool decrypted),
TP_ARGS(sk, tcp_seq, rec_no, rec_len, encrypted, decrypted),
TP_STRUCT__entry(
__field( struct sock *, sk )
__field( u64, rec_no )
__field( u32, tcp_seq )
__field( u32, rec_len )
__field( bool, encrypted )
__field( bool, decrypted )
),
TP_fast_assign(
__entry->sk = sk;
__entry->rec_no = get_unaligned_be64(rec_no);
__entry->tcp_seq = tcp_seq;
__entry->rec_len = rec_len;
__entry->encrypted = encrypted;
__entry->decrypted = decrypted;
),
TP_printk(
"sk=%p tcp_seq=%u rec_no=%llu len=%u encrypted=%d decrypted=%d",
__entry->sk, __entry->tcp_seq,
__entry->rec_no, __entry->rec_len,
__entry->encrypted, __entry->decrypted
)
);
TRACE_EVENT(tls_device_rx_resync_send,
TP_PROTO(struct sock *sk, u32 tcp_seq, u8 *rec_no, int sync_type),