kernel.git/crypto/scatterwalk.c, branch linux-6.15.y

crypto: scatterwalk - Add memcpy_sglist

2025-03-15T08:21:22Z

Add memcpy_sglist which copies one SG list to another. Signed-off-by: Herbert Xu

crypto: scatterwalk - Change scatterwalk_next calling convention

2025-03-15T08:21:22Z

Rather than returning the address and storing the length into an argument pointer, add an address field to the walk struct and use that to store the address. The length is returned directly. Change the done functions to use this stored address instead of getting them from the caller. Split the address into two using a union. The user should only access the const version so that it is never changed. Signed-off-by: Herbert Xu

crypto: scatterwalk - remove obsolete functions

2025-03-02T07:19:44Z

Remove various functions that are no longer used. Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu

crypto: scatterwalk - add new functions for copying data

2025-03-02T07:19:43Z

Add memcpy_from_sglist() and memcpy_to_sglist() which are more readable versions of scatterwalk_map_and_copy() with the 'out' argument 0 and 1 respectively. They follow the same argument order as memcpy_from_page() and memcpy_to_page() from . Note that in the case of memcpy_from_sglist(), this also happens to be the same argument order that scatterwalk_map_and_copy() uses. The new code is also faster, mainly because it builds the scatter_walk directly without creating a temporary scatterlist. E.g., a 20% performance improvement is seen for copying the AES-GCM auth tag. Make scatterwalk_map_and_copy() be a wrapper around memcpy_from_sglist() and memcpy_to_sglist(). Callers of scatterwalk_map_and_copy() should be updated to call memcpy_from_sglist() or memcpy_to_sglist() directly, but there are a lot of them so they aren't all being updated right away. Also add functions memcpy_from_scatterwalk() and memcpy_to_scatterwalk() which are similar but operate on a scatter_walk instead of a scatterlist. These will replace scatterwalk_copychunks() with the 'out' argument 0 and 1 respectively. Their behavior differs slightly from scatterwalk_copychunks() in that they automatically take care of flushing the dcache when needed, making them easier to use. scatterwalk_copychunks() itself is left unchanged for now. It will be removed after its callers are updated to use other functions instead. Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu

crypto: scatterwalk - add new functions for skipping data

2025-03-02T07:19:43Z

Add scatterwalk_skip() to skip the given number of bytes in a scatter_walk. Previously support for skipping was provided through scatterwalk_copychunks(..., 2) followed by scatterwalk_done(), which was confusing and less efficient. Also add scatterwalk_start_at_pos() which starts a scatter_walk at the given position, equivalent to scatterwalk_start() + scatterwalk_skip(). This addresses another common need in a more streamlined way. Later patches will convert various users to use these functions. Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30T18:26:32Z

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman

crypto: scatterwalk - remove 'chain' argument from scatterwalk_crypto_chain()

2018-08-03T10:06:03Z

All callers pass chain=0 to scatterwalk_crypto_chain(). Remove this unneeded parameter. Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu

crypto: scatterwalk - Remove unnecessary aliasing check in map_and_copy

2016-11-22T07:02:25Z

The aliasing check in map_and_copy is no longer necessary because the IPsec ESP code no longer provides an IV that points into the actual request data. As this check is now triggering BUG checks due to the vmalloced stack code, I'm removing it. Reported-by: Eric Biggers Signed-off-by: Herbert Xu

crypto: scatterwalk - Inline start/map/done

2016-07-18T09:35:50Z

This patch inlines the functions scatterwalk_start, scatterwalk_map and scatterwalk_done as they're all tiny and mostly used by the block cipher walker. Signed-off-by: Herbert Xu

crypto: scatterwalk - Remove unnecessary BUG in scatterwalk_start

2016-07-18T09:35:50Z

Nothing bad will happen even if sg->length is zero, so there is no point in keeping this BUG_ON in scatterwalk_start. Signed-off-by: Herbert Xu