Merge drm/drm-next into drm-misc-next-fixes

Backmerging to bring drm-misc-next-fixes up to the latest state for
the current release cycle.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>

1 files changed, 38 insertions, 48 deletions

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index c41273cefc51..fe98e4f475ba 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -422,28 +422,6 @@ bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
 	return false;
 }
 
-/* MP_JOIN client subflow must wait for 4th ack before sending any data:
- * TCP can't schedule delack timer before the subflow is fully established.
- * MPTCP uses the delack timer to do 3rd ack retransmissions
- */
-static void schedule_3rdack_retransmission(struct sock *sk)
-{
-	struct inet_connection_sock *icsk = inet_csk(sk);
-	struct tcp_sock *tp = tcp_sk(sk);
-	unsigned long timeout;
-
-	/* reschedule with a timeout above RTT, as we must look only for drop */
-	if (tp->srtt_us)
-		timeout = tp->srtt_us << 1;
-	else
-		timeout = TCP_TIMEOUT_INIT;
-
-	WARN_ON_ONCE(icsk->icsk_ack.pending & ICSK_ACK_TIMER);
-	icsk->icsk_ack.pending |= ICSK_ACK_SCHED | ICSK_ACK_TIMER;
-	icsk->icsk_ack.timeout = timeout;
-	sk_reset_timer(sk, &icsk->icsk_delack_timer, timeout);
-}
-
 static void clear_3rdack_retransmission(struct sock *sk)
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
@@ -485,11 +463,11 @@ static bool mptcp_established_options_mp(struct sock *sk, struct sk_buff *skb,
 		mpext = mptcp_get_ext(skb);
 		data_len = mpext ? mpext->data_len : 0;
 
-		/* we will check ext_copy.data_len in mptcp_write_options() to
+		/* we will check ops->data_len in mptcp_write_options() to
 		 * discriminate between TCPOLEN_MPTCP_MPC_ACK_DATA and
 		 * TCPOLEN_MPTCP_MPC_ACK
 		 */
-		opts->ext_copy.data_len = data_len;
+		opts->data_len = data_len;
 		opts->suboptions = OPTION_MPTCP_MPC_ACK;
 		opts->sndr_key = subflow->local_key;
 		opts->rcvr_key = subflow->remote_key;
@@ -505,9 +483,9 @@ static bool mptcp_established_options_mp(struct sock *sk, struct sk_buff *skb,
 			len = TCPOLEN_MPTCP_MPC_ACK_DATA;
 			if (opts->csum_reqd) {
 				/* we need to propagate more info to csum the pseudo hdr */
-				opts->ext_copy.data_seq = mpext->data_seq;
-				opts->ext_copy.subflow_seq = mpext->subflow_seq;
-				opts->ext_copy.csum = mpext->csum;
+				opts->data_seq = mpext->data_seq;
+				opts->subflow_seq = mpext->subflow_seq;
+				opts->csum = mpext->csum;
 				len += TCPOLEN_MPTCP_DSS_CHECKSUM;
 			}
 			*size = ALIGN(len, 4);
@@ -526,7 +504,15 @@ static bool mptcp_established_options_mp(struct sock *sk, struct sk_buff *skb,
 		*size = TCPOLEN_MPTCP_MPJ_ACK;
 		pr_debug("subflow=%p", subflow);
 
-		schedule_3rdack_retransmission(sk);
+		/* we can use the full delegate action helper only from BH context
+		 * If we are in process context - sk is flushing the backlog at
+		 * socket lock release time - just set the appropriate flag, will
+		 * be handled by the release callback
+		 */
+		if (sock_owned_by_user(sk))
+			set_bit(MPTCP_DELEGATE_ACK, &subflow->delegated_status);
+		else
+			mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_ACK);
 		return true;
 	}
 	return false;
@@ -748,9 +734,7 @@ static bool mptcp_established_options_mp_prio(struct sock *sk,
 	/* can't send MP_PRIO with MPC, as they share the same option space:
 	 * 'backup'. Also it makes no sense at all
 	 */
-	if (!subflow->send_mp_prio ||
-	    ((OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK |
-	      OPTION_MPTCP_MPC_ACK) & opts->suboptions))
+	if (!subflow->send_mp_prio || (opts->suboptions & OPTIONS_MPTCP_MPC))
 		return false;
 
 	/* account for the trailing 'nop' option */
@@ -1019,11 +1003,9 @@ static void ack_update_msk(struct mptcp_sock *msk,
 	old_snd_una = msk->snd_una;
 	new_snd_una = mptcp_expand_seq(old_snd_una, mp_opt->data_ack, mp_opt->ack64);
 
-	/* ACK for data not even sent yet and even above recovery bound? Ignore.*/
-	if (unlikely(after64(new_snd_una, snd_nxt))) {
-		if (!msk->recovery || after64(new_snd_una, msk->recovery_snd_nxt))
-			new_snd_una = old_snd_una;
-	}
+	/* ACK for data not even sent yet? Ignore.*/
+	if (unlikely(after64(new_snd_una, snd_nxt)))
+		new_snd_una = old_snd_una;
 
 	new_wnd_end = new_snd_una + tcp_sk(ssk)->snd_wnd;
 
@@ -1227,7 +1209,7 @@ static void mptcp_set_rwin(const struct tcp_sock *tp)
 		WRITE_ONCE(msk->rcv_wnd_sent, ack_seq);
 }
 
-static u16 mptcp_make_csum(const struct mptcp_ext *mpext)
+static u16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __sum16 sum)
 {
 	struct csum_pseudo_header header;
 	__wsum csum;
@@ -1237,15 +1219,21 @@ static u16 mptcp_make_csum(const struct mptcp_ext *mpext)
 	 * always the 64-bit value, irrespective of what length is used in the
 	 * DSS option itself.
 	 */
-	header.data_seq = cpu_to_be64(mpext->data_seq);
-	header.subflow_seq = htonl(mpext->subflow_seq);
-	header.data_len = htons(mpext->data_len);
+	header.data_seq = cpu_to_be64(data_seq);
+	header.subflow_seq = htonl(subflow_seq);
+	header.data_len = htons(data_len);
 	header.csum = 0;
 
-	csum = csum_partial(&header, sizeof(header), ~csum_unfold(mpext->csum));
+	csum = csum_partial(&header, sizeof(header), ~csum_unfold(sum));
 	return (__force u16)csum_fold(csum);
 }
 
+static u16 mptcp_make_csum(const struct mptcp_ext *mpext)
+{
+	return __mptcp_make_csum(mpext->data_seq, mpext->subflow_seq, mpext->data_len,
+				 mpext->csum);
+}
+
 void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
 			 struct mptcp_out_options *opts)
 {
@@ -1329,15 +1317,14 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
 						   TCPOPT_NOP << 8 | TCPOPT_NOP, ptr);
 			}
 		}
-	} else if ((OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK |
-		    OPTION_MPTCP_MPC_ACK) & opts->suboptions) {
+	} else if (OPTIONS_MPTCP_MPC & opts->suboptions) {
 		u8 len, flag = MPTCP_CAP_HMAC_SHA256;
 
 		if (OPTION_MPTCP_MPC_SYN & opts->suboptions) {
 			len = TCPOLEN_MPTCP_MPC_SYN;
 		} else if (OPTION_MPTCP_MPC_SYNACK & opts->suboptions) {
 			len = TCPOLEN_MPTCP_MPC_SYNACK;
-		} else if (opts->ext_copy.data_len) {
+		} else if (opts->data_len) {
 			len = TCPOLEN_MPTCP_MPC_ACK_DATA;
 			if (opts->csum_reqd)
 				len += TCPOLEN_MPTCP_DSS_CHECKSUM;
@@ -1366,14 +1353,17 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
 
 		put_unaligned_be64(opts->rcvr_key, ptr);
 		ptr += 2;
-		if (!opts->ext_copy.data_len)
+		if (!opts->data_len)
 			goto mp_capable_done;
 
 		if (opts->csum_reqd) {
-			put_unaligned_be32(opts->ext_copy.data_len << 16 |
-					   mptcp_make_csum(&opts->ext_copy), ptr);
+			put_unaligned_be32(opts->data_len << 16 |
+					   __mptcp_make_csum(opts->data_seq,
+							     opts->subflow_seq,
+							     opts->data_len,
+							     opts->csum), ptr);
 		} else {
-			put_unaligned_be32(opts->ext_copy.data_len << 16 |
+			put_unaligned_be32(opts->data_len << 16 |
 					   TCPOPT_NOP << 8 | TCPOPT_NOP, ptr);
 		}
 		ptr += 1;