pdcp: similar to tx, also reduce log for Rx

instead of logging PDU received from below, and SDU that is forwarded
to above, only log the PDU in rx in info mode.

The next layer will do the same and log the PDU received (which is the SDU coming from here)
so there is now loss of information in the logs.

lib/src/upper/pdcp_entity_lte.cc

@@ -214,9 +214,10 @@ void pdcp_entity_lte::handle_srb_pdu(srslte::unique_byte_buffer_t pdu)
   // Perform decryption
   if (encryption_direction == DIRECTION_RX || encryption_direction == DIRECTION_TXRX) {
     cipher_decrypt(&pdu->msg[cfg.hdr_len_bytes], pdu->N_bytes - cfg.hdr_len_bytes, count, &pdu->msg[cfg.hdr_len_bytes]);
-    log->info_hex(pdu->msg, pdu->N_bytes, "%s Rx PDU (decrypted)", rrc->get_rb_name(lcid).c_str());
   }
 
+  log->debug_hex(pdu->msg, pdu->N_bytes, "%s Rx SDU SN=%d", rrc->get_rb_name(lcid).c_str(), sn);
+
   // Extract MAC
   uint8_t mac[4];
   extract_mac(pdu, mac);
@@ -244,7 +245,6 @@ void pdcp_entity_lte::handle_srb_pdu(srslte::unique_byte_buffer_t pdu)
   }
 
   // Pass to upper layers
-  log->debug_hex(pdu->msg, pdu->N_bytes, "Passing SDU to upper layers");
   rrc->write_pdu(lcid, std::move(pdu));
 }
 
@@ -261,9 +261,10 @@ void pdcp_entity_lte::handle_um_drb_pdu(srslte::unique_byte_buffer_t pdu)
   uint32_t count = (st.rx_hfn << cfg.sn_len) | sn;
   if (encryption_direction == DIRECTION_RX || encryption_direction == DIRECTION_TXRX) {
     cipher_decrypt(pdu->msg, pdu->N_bytes, count, pdu->msg);
-    log->debug_hex(pdu->msg, pdu->N_bytes, "%s Rx PDU (decrypted)", rrc->get_rb_name(lcid).c_str());
   }
 
+  log->debug_hex(pdu->msg, pdu->N_bytes, "%s Rx PDU SN=%d", rrc->get_rb_name(lcid).c_str(), sn);
+
   st.next_pdcp_rx_sn = sn + 1;
   if (st.next_pdcp_rx_sn > maximum_pdcp_sn) {
     st.next_pdcp_rx_sn = 0;
@@ -271,7 +272,6 @@ void pdcp_entity_lte::handle_um_drb_pdu(srslte::unique_byte_buffer_t pdu)
   }
 
   // Pass to upper layers
-  log->info_hex(pdu->msg, pdu->N_bytes, "%s Rx PDU SN=%d", rrc->get_rb_name(lcid).c_str(), sn);
   gw->write_pdu(lcid, std::move(pdu));
 }
 
@@ -325,13 +325,12 @@ void pdcp_entity_lte::handle_am_drb_pdu(srslte::unique_byte_buffer_t pdu)
 
   // Decrypt
   cipher_decrypt(pdu->msg, pdu->N_bytes, count, pdu->msg);
-  log->debug_hex(pdu->msg, pdu->N_bytes, "%s Rx PDU (decrypted)", rrc->get_rb_name(lcid).c_str());
+  log->debug_hex(pdu->msg, pdu->N_bytes, "%s Rx SDU SN=%d", rrc->get_rb_name(lcid).c_str(), sn);
 
   // Update info on last PDU submitted to upper layers
   st.last_submitted_pdcp_rx_sn = sn;
 
   // Pass to upper layers
-  log->info_hex(pdu->msg, pdu->N_bytes, "%s Rx PDU SN=%d", rrc->get_rb_name(lcid).c_str(), sn);
   gw->write_pdu(lcid, std::move(pdu));
 }