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net/tls: simplify seq calculation in handle_device_resync()

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We subtract "TLS_HEADER_SIZE - 1" from req_seq, then if they
match we add the same constant to seq.  Just add it to seq,
and we don't have to touch req_seq.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2019-06-10 21:39:59 -07:00 committed by David S. Miller
parent 46088059aa
commit 4967373959
1 changed files with 3 additions and 4 deletions
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7
net/tls/tls_device.c
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@ -576,14 +576,13 @@ void handle_device_resync(struct sock *sk, u32 seq, u64 rcd_sn)
rx_ctx = tls_offload_ctx_rx(tls_ctx);
resync_req = atomic64_read(&rx_ctx->resync_req);
req_seq = (resync_req >> 32) - ((u32)TLS_HEADER_SIZE - 1);
req_seq = resync_req >> 32;
seq += TLS_HEADER_SIZE - 1;
is_req_pending = resync_req;
if (unlikely(is_req_pending) && req_seq == seq &&
atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0)) {
seq += TLS_HEADER_SIZE - 1;
atomic64_try_cmpxchg(&rx_ctx->resync_req, &resync_req, 0))
tls_device_resync_rx(tls_ctx, sk, seq, rcd_sn);
}
}
static int tls_device_reencrypt(struct sock *sk, struct sk_buff *skb)