eal/windows: add missing SPDX license tag

[dpdk.git] / drivers / crypto / octeontx2 / otx2_ipsec_anti_replay.h

diff --git a/drivers/crypto/octeontx2/otx2_ipsec_anti_replay.h b/drivers/crypto/octeontx2/otx2_ipsec_anti_replay.h
index d599692..b2b1f77 100644 (file)
--- a/drivers/crypto/octeontx2/otx2_ipsec_anti_replay.h
+++ b/drivers/crypto/octeontx2/otx2_ipsec_anti_replay.h
@@ -204,4 +204,25 @@ cpt_ipsec_ip_antireplay_check(struct otx2_ipsec_fp_in_sa *sa, char *data)
 
        return ret;
 }
+
+static inline uint32_t
+anti_replay_get_seqh(uint32_t winsz, uint32_t seql,
+                       uint32_t esn_hi, uint32_t esn_low)
+{
+       uint32_t win_low = esn_low - winsz + 1;
+
+       if (esn_low > winsz - 1) {
+               /* Window is in one sequence number subspace */
+               if (seql > win_low)
+                       return esn_hi;
+               else
+                       return esn_hi + 1;
+       } else {
+               /* Window is split across two sequence number subspaces */
+               if (seql > win_low)
+                       return esn_hi - 1;
+               else
+                       return esn_hi;
+       }
+}
 #endif /* __OTX2_IPSEC_ANTI_REPLAY_H__ */