Subject: [PATCH RFC PKS/PMEM 40/58] net: Utilize new kmap_thread()

From: [email-masked]
Date: Fri, 9 Oct 2020 12:50:15 -0700

From: Ira Weiny <[email-masked]>

These kmap() calls in these drivers are localized to a single thread.
To avoid the over head of global PKRS updates use the new kmap_thread()
call.

Cc: "David S. Miller" <[email-masked]>
Cc: Jakub Kicinski <[email-masked]>
Cc: Alexey Kuznetsov <[email-masked]>
Cc: Hideaki YOSHIFUJI <[email-masked]>
Cc: Trond Myklebust <[email-masked]>
Cc: Anna Schumaker <[email-masked]>
Cc: Boris Pismenny <[email-masked]>
Cc: Aviad Yehezkel <[email-masked]>
Cc: John Fastabend <[email-masked]>
Cc: Daniel Borkmann <[email-masked]>
Signed-off-by: Ira Weiny <[email-masked]>
---
 net/ceph/messenger.c | 4 ++--
 net/core/datagram.c  | 4 ++--
 net/core/sock.c      | 8 ++++----
 net/ipv4/ip_output.c | 4 ++--
 net/sunrpc/cache.c   | 4 ++--
 net/sunrpc/xdr.c     | 8 ++++----
 net/tls/tls_device.c | 4 ++--
 7 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index d4d7a0e52491..0c49b8e333da 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -1535,10 +1535,10 @@ static u32 ceph_crc32c_page(u32 crc, struct page *page,
 {
 	char *kaddr;
 
-	kaddr = kmap(page);
+	kaddr = kmap_thread(page);
 	BUG_ON(kaddr == NULL);
 	crc = crc32c(crc, kaddr + page_offset, length);
-	kunmap(page);
+	kunmap_thread(page);
 
 	return crc;
 }
diff --git a/net/core/datagram.c b/net/core/datagram.c
index 639745d4f3b9..cbd0a343074a 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -441,14 +441,14 @@ static int __skb_datagram_iter(const struct sk_buff *skb, int offset,
 		end = start + skb_frag_size(frag);
 		if ((copy = end - offset) > 0) {
 			struct page *page = skb_frag_page(frag);
-			u8 *vaddr = kmap(page);
+			u8 *vaddr = kmap_thread(page);
 
 			if (copy > len)
 				copy = len;
 			n = INDIRECT_CALL_1(cb, simple_copy_to_iter,
 					vaddr + skb_frag_off(frag) + offset - start,
 					copy, data, to);
-			kunmap(page);
+			kunmap_thread(page);
 			offset += n;
 			if (n != copy)
 				goto short_copy;
diff --git a/net/core/sock.c b/net/core/sock.c
index 6c5c6b18eff4..9b46a75cd8c1 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2846,11 +2846,11 @@ ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, siz
 	ssize_t res;
 	struct msghdr msg = {.msg_flags = flags};
 	struct kvec iov;
-	char *kaddr = kmap(page);
+	char *kaddr = kmap_thread(page);
 	iov.iov_base = kaddr + offset;
 	iov.iov_len = size;
 	res = kernel_sendmsg(sock, &msg, &iov, 1, size);
-	kunmap(page);
+	kunmap_thread(page);
 	return res;
 }
 EXPORT_SYMBOL(sock_no_sendpage);
@@ -2861,12 +2861,12 @@ ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
 	ssize_t res;
 	struct msghdr msg = {.msg_flags = flags};
 	struct kvec iov;
-	char *kaddr = kmap(page);
+	char *kaddr = kmap_thread(page);
 
 	iov.iov_base = kaddr + offset;
 	iov.iov_len = size;
 	res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
-	kunmap(page);
+	kunmap_thread(page);
 	return res;
 }
 EXPORT_SYMBOL(sock_no_sendpage_locked);
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index e6f2ada9e7d5..05304fb251a4 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -949,9 +949,9 @@ csum_page(struct page *page, int offset, int copy)
 {
 	char *kaddr;
 	__wsum csum;
-	kaddr = kmap(page);
+	kaddr = kmap_thread(page);
 	csum = csum_partial(kaddr + offset, copy, 0);
-	kunmap(page);
+	kunmap_thread(page);
 	return csum;
 }
 
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index baef5ee43dbb..88193f2a8e6f 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -935,9 +935,9 @@ static ssize_t cache_downcall(struct address_space *mapping,
 	if (!page)
 		goto out_slow;
 
-	kaddr = kmap(page);
+	kaddr = kmap_thread(page);
 	ret = cache_do_downcall(kaddr, buf, count, cd);
-	kunmap(page);
+	kunmap_thread(page);
 	unlock_page(page);
 	put_page(page);
 	return ret;
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index be11d672b5b9..00afbb48fb0a 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -1353,7 +1353,7 @@ xdr_xcode_array2(struct xdr_buf *buf, unsigned int base,
 		base &= ~PAGE_MASK;
 		avail_page = min_t(unsigned int, PAGE_SIZE - base,
 					avail_here);
-		c = kmap(*ppages) + base;
+		c = kmap_thread(*ppages) + base;
 
 		while (avail_here) {
 			avail_here -= avail_page;
@@ -1429,9 +1429,9 @@ xdr_xcode_array2(struct xdr_buf *buf, unsigned int base,
 				}
 			}
 			if (avail_here) {
-				kunmap(*ppages);
+				kunmap_thread(*ppages);
 				ppages++;
-				c = kmap(*ppages);
+				c = kmap_thread(*ppages);
 			}
 
 			avail_page = min(avail_here,
@@ -1471,7 +1471,7 @@ xdr_xcode_array2(struct xdr_buf *buf, unsigned int base,
 out:
 	kfree(elem);
 	if (ppages)
-		kunmap(*ppages);
+		kunmap_thread(*ppages);
 	return err;
 }
 
diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index b74e2741f74f..ead5b1c485f8 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -576,13 +576,13 @@ int tls_device_sendpage(struct sock *sk, struct page *page,
 		goto out;
 	}
 
-	kaddr = kmap(page);
+	kaddr = kmap_thread(page);
 	iov.iov_base = kaddr + offset;
 	iov.iov_len = size;
 	iov_iter_kvec(&msg_iter, WRITE, &iov, 1, size);
 	rc = tls_push_data(sk, &msg_iter, size,
 			   flags, TLS_RECORD_TYPE_DATA);
-	kunmap(page);
+	kunmap_thread(page);
 
 out:
 	release_sock(sk);
-- 
2.28.0.rc0.12.gb6a658bd00c9