Subject: [PATCH v2 26/29] net/tls: use the new scatterwalk functions

From: Eric Biggers <[email-masked]>
Date: Sun, 29 Dec 2024 16:14:15 -0800

From: Eric Biggers <[email-masked]>

Replace calls to the deprecated function scatterwalk_copychunks() with
memcpy_from_scatterwalk(), memcpy_to_scatterwalk(), or
scatterwalk_skip() as appropriate.  The new functions generally behave
more as expected and eliminate the need to call scatterwalk_done() or
scatterwalk_pagedone().

However, the new functions intentionally do not advance to the next sg
entry right away, which would have broken chain_to_walk() which is
accessing the fields of struct scatter_walk directly.  To avoid this,
replace chain_to_walk() with scatterwalk_get_sglist() which supports the
needed functionality.

Cc: Boris Pismenny <[email-masked]>
Cc: Jakub Kicinski <[email-masked]>
Cc: John Fastabend <[email-masked]>
Signed-off-by: Eric Biggers <[email-masked]>
---

This patch is part of a long series touching many files, so I have
limited the Cc list on the full series.  If you want the full series and
did not receive it, please retrieve it from lore.kernel.org.

 net/tls/tls_device_fallback.c | 31 ++++++-------------------------
 1 file changed, 6 insertions(+), 25 deletions(-)

diff --git a/net/tls/tls_device_fallback.c b/net/tls/tls_device_fallback.c
index f9e3d3d90dcf..03d508a45aae 100644
--- a/net/tls/tls_device_fallback.c
+++ b/net/tls/tls_device_fallback.c
@@ -35,21 +35,10 @@
 #include <net/ip6_checksum.h>
 #include <linux/skbuff_ref.h>
 
 #include "tls.h"
 
-static void chain_to_walk(struct scatterlist *sg, struct scatter_walk *walk)
-{
-	struct scatterlist *src = walk->sg;
-	int diff = walk->offset - src->offset;
-
-	sg_set_page(sg, sg_page(src),
-		    src->length - diff, walk->offset);
-
-	scatterwalk_crypto_chain(sg, sg_next(src), 2);
-}
-
 static int tls_enc_record(struct aead_request *aead_req,
 			  struct crypto_aead *aead, char *aad,
 			  char *iv, __be64 rcd_sn,
 			  struct scatter_walk *in,
 			  struct scatter_walk *out, int *in_len,
@@ -67,20 +56,17 @@ static int tls_enc_record(struct aead_request *aead_req,
 	DEBUG_NET_WARN_ON_ONCE(!cipher_desc || !cipher_desc->offloadable);
 
 	buf_size = TLS_HEADER_SIZE + cipher_desc->iv;
 	len = min_t(int, *in_len, buf_size);
 
-	scatterwalk_copychunks(buf, in, len, 0);
-	scatterwalk_copychunks(buf, out, len, 1);
+	memcpy_from_scatterwalk(buf, in, len);
+	memcpy_to_scatterwalk(out, buf, len);
 
 	*in_len -= len;
 	if (!*in_len)
 		return 0;
 
-	scatterwalk_pagedone(in, 0, 1);
-	scatterwalk_pagedone(out, 1, 1);
-
 	len = buf[4] | (buf[3] << 8);
 	len -= cipher_desc->iv;
 
 	tls_make_aad(aad, len - cipher_desc->tag, (char *)&rcd_sn, buf[0], prot);
 
@@ -88,12 +74,12 @@ static int tls_enc_record(struct aead_request *aead_req,
 
 	sg_init_table(sg_in, ARRAY_SIZE(sg_in));
 	sg_init_table(sg_out, ARRAY_SIZE(sg_out));
 	sg_set_buf(sg_in, aad, TLS_AAD_SPACE_SIZE);
 	sg_set_buf(sg_out, aad, TLS_AAD_SPACE_SIZE);
-	chain_to_walk(sg_in + 1, in);
-	chain_to_walk(sg_out + 1, out);
+	scatterwalk_get_sglist(in, sg_in + 1);
+	scatterwalk_get_sglist(out, sg_out + 1);
 
 	*in_len -= len;
 	if (*in_len < 0) {
 		*in_len += cipher_desc->tag;
 		/* the input buffer doesn't contain the entire record.
@@ -108,14 +94,12 @@ static int tls_enc_record(struct aead_request *aead_req,
 
 		*in_len = 0;
 	}
 
 	if (*in_len) {
-		scatterwalk_copychunks(NULL, in, len, 2);
-		scatterwalk_pagedone(in, 0, 1);
-		scatterwalk_copychunks(NULL, out, len, 2);
-		scatterwalk_pagedone(out, 1, 1);
+		scatterwalk_skip(in, len);
+		scatterwalk_skip(out, len);
 	}
 
 	len -= cipher_desc->tag;
 	aead_request_set_crypt(aead_req, sg_in, sg_out, len, iv);
 
@@ -160,13 +144,10 @@ static int tls_enc_records(struct aead_request *aead_req,
 				    cpu_to_be64(rcd_sn), &in, &out, &len, prot);
 		rcd_sn++;
 
 	} while (rc == 0 && len);
 
-	scatterwalk_done(&in, 0, 0);
-	scatterwalk_done(&out, 1, 0);
-
 	return rc;
 }
 
 /* Can't use icsk->icsk_af_ops->send_check here because the ip addresses
  * might have been changed by NAT.
-- 
2.47.1