rtwn: enable seqno offload; migrate to use ieee80211_output_seqno_assign()

This should both enable the sequence number offloading and disable
the net80211 TX lock from being acquired/released/checked.

Locally tested:

* RTL8812AU, STA mode

Reviewed by: bz
Differential Revision:	https://reviews.freebsd.org/D52301
Differential Revision:	https://reviews.freebsd.org/D50693

Author: Adrian Chadd

sys/dev/rtwn/if_rtwn.c

@@ -268,6 +268,9 @@ rtwn_attach(struct rtwn_softc *sc)
 	ic->ic_flags_ext |= IEEE80211_FEXT_WATCHDOG;
 #endif
 
+	/* Enable seqno offload */
+	ic->ic_flags_ext |= IEEE80211_FEXT_SEQNO_OFFLOAD;
+
 	/* Adjust capabilities. */
 	rtwn_adj_devcaps(sc);
 

sys/dev/rtwn/if_rtwn_tx.c

@@ -183,6 +183,10 @@ rtwn_tx_data(struct rtwn_softc *sc, struct ieee80211_node *ni,
 		}
 	}
 
+	/* seqno allocate, only if AMPDU isn't running */
+	if ((m->m_flags & M_AMPDU_MPDU) == 0)
+		ieee80211_output_seqno_assign(ni, -1, m);
+
 	cipher = IEEE80211_CIPHER_NONE;
 	if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 		k = ieee80211_crypto_encap(ni, m);
@@ -229,6 +233,10 @@ rtwn_tx_raw(struct rtwn_softc *sc, struct ieee80211_node *ni,
 	uint8_t type;
 	u_int cipher;
 
+	/* seqno allocate, only if AMPDU isn't running */
+	if ((m->m_flags & M_AMPDU_MPDU) == 0)
+		ieee80211_output_seqno_assign(ni, -1, m);
+
 	/* Encrypt the frame if need be. */
 	cipher = IEEE80211_CIPHER_NONE;
 	if (params->ibp_flags & IEEE80211_BPF_CRYPTO) {

sys/dev/rtwn/rtl8192c/r92c_tx.c

@@ -452,11 +452,10 @@ r92c_fill_tx_desc(struct rtwn_softc *sc, struct ieee80211_node *ni,
 	} else {
 		uint16_t seqno;
 
-		if (m->m_flags & M_AMPDU_MPDU) {
-			seqno = ni->ni_txseqs[tid] % IEEE80211_SEQ_RANGE;
-			ni->ni_txseqs[tid]++;
-		} else
-			seqno = M_SEQNO_GET(m) % IEEE80211_SEQ_RANGE;
+		if (m->m_flags & M_AMPDU_MPDU)
+			ieee80211_output_seqno_assign(ni, -1, m);
+
+		seqno = M_SEQNO_GET(m);
 
 		/* Set sequence number. */
 		txd->txdseq = htole16(seqno);
@@ -511,7 +510,7 @@ r92c_fill_tx_desc_raw(struct rtwn_softc *sc, struct ieee80211_node *ni,
 		rtwn_r92c_tx_setup_hwseq(sc, txd);
 	} else {
 		/* Set sequence number. */
-		txd->txdseq |= htole16(M_SEQNO_GET(m) % IEEE80211_SEQ_RANGE);
+		txd->txdseq |= htole16(M_SEQNO_GET(m));
 	}
 }
 

sys/dev/rtwn/rtl8812a/r12a_tx.c

@@ -433,12 +433,9 @@ r12a_fill_tx_desc(struct rtwn_softc *sc, struct ieee80211_node *ni,
 	} else {
 		uint16_t seqno;
 
-		if (m->m_flags & M_AMPDU_MPDU) {
-			seqno = ni->ni_txseqs[tid];
-			ni->ni_txseqs[tid]++;
-		} else
-			seqno = M_SEQNO_GET(m) % IEEE80211_SEQ_RANGE;
-
+		if (m->m_flags & M_AMPDU_MPDU)
+			ieee80211_output_seqno_assign(ni, -1, m);
+		seqno = M_SEQNO_GET(m);
 		/* Set sequence number. */
 		txd->txdw9 |= htole32(SM(R12A_TXDW9_SEQ, seqno));
 	}
@@ -493,8 +490,7 @@ r12a_fill_tx_desc_raw(struct rtwn_softc *sc, struct ieee80211_node *ni,
 		txd->txdw3 |= htole32(SM(R12A_TXDW3_SEQ_SEL, uvp->id));
 	} else {
 		/* Set sequence number. */
-		txd->txdw9 |= htole32(SM(R12A_TXDW9_SEQ,
-		    M_SEQNO_GET(m) % IEEE80211_SEQ_RANGE));
+		txd->txdw9 |= htole32(SM(R12A_TXDW9_SEQ, M_SEQNO_GET(m)));
 	}
 }