diff mbox series

[v3,05/19] crypto: scatterwalk - add scatterwalk_get_sglist()

Message ID 20250219182341.43961-6-ebiggers@kernel.org (mailing list archive)
State Not Applicable
Headers show
Series crypto: scatterlist handling improvements | expand

Checks

Context Check Description
netdev/series_format fail Series longer than 15 patches
netdev/tree_selection success Guessed tree name to be net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/build_tools success Errors and warnings before: 26 (+1) this patch: 26 (+1)
netdev/cc_maintainers fail 1 maintainers not CCed: herbert@gondor.apana.org.au
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1 this patch: 1
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 23 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2025-02-20--12-00 (tests: 893)

Commit Message

Eric Biggers Feb. 19, 2025, 6:23 p.m. UTC 
From: Eric Biggers <ebiggers@google.com>

Add a function that creates a scatterlist that represents the remaining
data in a walk.  This will be used to replace chain_to_walk() in
net/tls/tls_device_fallback.c so that it will no longer need to reach
into the internals of struct scatter_walk.

Cc: Boris Pismenny <borisp@nvidia.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 include/crypto/scatterwalk.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
diff mbox series

Patch

diff --git a/include/crypto/scatterwalk.h b/include/crypto/scatterwalk.h
index 1689ecd7ddafa..f6262d05a3c75 100644
--- a/include/crypto/scatterwalk.h
+++ b/include/crypto/scatterwalk.h
@@ -67,10 +67,27 @@  static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk,
 static inline struct page *scatterwalk_page(struct scatter_walk *walk)
 {
 	return sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
 }
 
+/*
+ * Create a scatterlist that represents the remaining data in a walk.  Uses
+ * chaining to reference the original scatterlist, so this uses at most two
+ * entries in @sg_out regardless of the number of entries in the original list.
+ * Assumes that sg_init_table() was already done.
+ */
+static inline void scatterwalk_get_sglist(struct scatter_walk *walk,
+					  struct scatterlist sg_out[2])
+{
+	if (walk->offset >= walk->sg->offset + walk->sg->length)
+		scatterwalk_start(walk, sg_next(walk->sg));
+	sg_set_page(sg_out, sg_page(walk->sg),
+		    walk->sg->offset + walk->sg->length - walk->offset,
+		    walk->offset);
+	scatterwalk_crypto_chain(sg_out, sg_next(walk->sg), 2);
+}
+
 static inline void scatterwalk_unmap(void *vaddr)
 {
 	kunmap_local(vaddr);
 }