diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index a63e13082397..686a666d073d 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -454,9 +454,15 @@ enum {
 	 * all frags to avoid possible bad checksum
 	 */
 	SKBFL_SHARED_FRAG = BIT(1),
+
+	/* segment contains only zerocopy data and should not be
+	 * charged to the kernel memory.
+	 */
+	SKBFL_PURE_ZEROCOPY = BIT(2),
 };
 
 #define SKBFL_ZEROCOPY_FRAG	(SKBFL_ZEROCOPY_ENABLE | SKBFL_SHARED_FRAG)
+#define SKBFL_ALL_ZEROCOPY	(SKBFL_ZEROCOPY_FRAG | SKBFL_PURE_ZEROCOPY)
 
 /*
  * The callback notifies userspace to release buffers when skb DMA is done in
@@ -1464,6 +1470,17 @@ static inline struct ubuf_info *skb_zcopy(struct sk_buff *skb)
 	return is_zcopy ? skb_uarg(skb) : NULL;
 }
 
+static inline bool skb_zcopy_pure(const struct sk_buff *skb)
+{
+	return skb_shinfo(skb)->flags & SKBFL_PURE_ZEROCOPY;
+}
+
+static inline bool skb_pure_zcopy_same(const struct sk_buff *skb1,
+				       const struct sk_buff *skb2)
+{
+	return skb_zcopy_pure(skb1) == skb_zcopy_pure(skb2);
+}
+
 static inline void net_zcopy_get(struct ubuf_info *uarg)
 {
 	refcount_inc(&uarg->refcnt);
@@ -1528,7 +1545,7 @@ static inline void skb_zcopy_clear(struct sk_buff *skb, bool zerocopy_success)
 		if (!skb_zcopy_is_nouarg(skb))
 			uarg->callback(skb, uarg, zerocopy_success);
 
-		skb_shinfo(skb)->flags &= ~SKBFL_ZEROCOPY_FRAG;
+		skb_shinfo(skb)->flags &= ~SKBFL_ALL_ZEROCOPY;
 	}
 }
 
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 70972f3ac8fa..4da22b41bde6 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -293,7 +293,10 @@ static inline bool tcp_out_of_memory(struct sock *sk)
 static inline void tcp_wmem_free_skb(struct sock *sk, struct sk_buff *skb)
 {
 	sk_wmem_queued_add(sk, -skb->truesize);
-	sk_mem_uncharge(sk, skb->truesize);
+	if (!skb_zcopy_pure(skb))
+		sk_mem_uncharge(sk, skb->truesize);
+	else
+		sk_mem_uncharge(sk, SKB_TRUESIZE(skb_end_offset(skb)));
 	__kfree_skb(skb);
 }
 
@@ -974,7 +977,8 @@ static inline bool tcp_skb_can_collapse(const struct sk_buff *to,
 					const struct sk_buff *from)
 {
 	return likely(tcp_skb_can_collapse_to(to) &&
-		      mptcp_skb_can_collapse(to, from));
+		      mptcp_skb_can_collapse(to, from) &&
+		      skb_pure_zcopy_same(to, from));
 }
 
 /* Events passed to congestion control interface */
diff --git a/net/core/datagram.c b/net/core/datagram.c
index 15ab9ffb27fe..ee290776c661 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -646,7 +646,8 @@ int __zerocopy_sg_from_iter(struct sock *sk, struct sk_buff *skb,
 		skb->truesize += truesize;
 		if (sk && sk->sk_type == SOCK_STREAM) {
 			sk_wmem_queued_add(sk, truesize);
-			sk_mem_charge(sk, truesize);
+			if (!skb_zcopy_pure(skb))
+				sk_mem_charge(sk, truesize);
 		} else {
 			refcount_add(truesize, &skb->sk->sk_wmem_alloc);
 		}
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 3ec42cdee16a..ba2f38246f07 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3433,8 +3433,9 @@ static inline void skb_split_no_header(struct sk_buff *skb,
 void skb_split(struct sk_buff *skb, struct sk_buff *skb1, const u32 len)
 {
 	int pos = skb_headlen(skb);
+	const int zc_flags = SKBFL_SHARED_FRAG | SKBFL_PURE_ZEROCOPY;
 
-	skb_shinfo(skb1)->flags |= skb_shinfo(skb)->flags & SKBFL_SHARED_FRAG;
+	skb_shinfo(skb1)->flags |= skb_shinfo(skb)->flags & zc_flags;
 	skb_zerocopy_clone(skb1, skb, 0);
 	if (len < pos)	/* Split line is inside header. */
 		skb_split_inside_header(skb, skb1, len, pos);
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index bc7f419184aa..b461ae573afc 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -863,6 +863,7 @@ struct sk_buff *tcp_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp,
 	if (likely(skb)) {
 		bool mem_scheduled;
 
+		skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
 		if (force_schedule) {
 			mem_scheduled = true;
 			sk_forced_mem_schedule(sk, skb->truesize);
@@ -1319,6 +1320,15 @@ int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size)
 
 			copy = min_t(int, copy, pfrag->size - pfrag->offset);
 
+			/* skb changing from pure zc to mixed, must charge zc */
+			if (unlikely(skb_zcopy_pure(skb))) {
+				if (!sk_wmem_schedule(sk, skb->data_len))
+					goto wait_for_space;
+
+				sk_mem_charge(sk, skb->data_len);
+				skb_shinfo(skb)->flags &= ~SKBFL_PURE_ZEROCOPY;
+			}
+
 			if (!sk_wmem_schedule(sk, copy))
 				goto wait_for_space;
 
@@ -1339,8 +1349,16 @@ int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size)
 			}
 			pfrag->offset += copy;
 		} else {
-			if (!sk_wmem_schedule(sk, copy))
-				goto wait_for_space;
+			/* First append to a fragless skb builds initial
+			 * pure zerocopy skb
+			 */
+			if (!skb->len)
+				skb_shinfo(skb)->flags |= SKBFL_PURE_ZEROCOPY;
+
+			if (!skb_zcopy_pure(skb)) {
+				if (!sk_wmem_schedule(sk, copy))
+					goto wait_for_space;
+			}
 
 			err = skb_zerocopy_iter_stream(sk, skb, msg, copy, uarg);
 			if (err == -EMSGSIZE || err == -EEXIST) {
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 76cc1641beb4..6f7860e283c6 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1677,7 +1677,8 @@ int tcp_trim_head(struct sock *sk, struct sk_buff *skb, u32 len)
 	if (delta_truesize) {
 		skb->truesize	   -= delta_truesize;
 		sk_wmem_queued_add(sk, -delta_truesize);
-		sk_mem_uncharge(sk, delta_truesize);
+		if (!skb_zcopy_pure(skb))
+			sk_mem_uncharge(sk, delta_truesize);
 	}
 
 	/* Any change of skb->len requires recalculation of tso factor. */
@@ -2295,7 +2296,9 @@ static bool tcp_can_coalesce_send_queue_head(struct sock *sk, int len)
 		if (len <= skb->len)
 			break;
 
-		if (unlikely(TCP_SKB_CB(skb)->eor) || tcp_has_tx_tstamp(skb))
+		if (unlikely(TCP_SKB_CB(skb)->eor) ||
+		    tcp_has_tx_tstamp(skb) ||
+		    !skb_pure_zcopy_same(skb, next))
 			return false;
 
 		len -= skb->len;