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Subject[PATCH v6 2/5] crypto: add zBeWalgo to crypto-api
Date
This patch adds zBeWalgo to the crypto api so that zBeWalgo can be used by
zram.

Signed-off-by: Benjamin Warnke <4bwarnke@informatik.uni-hamburg.de>
---
crypto/Kconfig | 12 ++++
crypto/Makefile | 1 +
crypto/testmgr.c | 10 +++
crypto/testmgr.h | 134 ++++++++++++++++++++++++++++++++++
crypto/zbewalgo.c | 164 ++++++++++++++++++++++++++++++++++++++++++
drivers/block/zram/zcomp.c | 3 +
drivers/block/zram/zram_drv.h | 4 +-
7 files changed, 327 insertions(+), 1 deletion(-)
create mode 100644 crypto/zbewalgo.c

diff --git a/crypto/Kconfig b/crypto/Kconfig
index b75264b09..3ac0d4ca7 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1668,6 +1668,18 @@ config CRYPTO_LZ4
help
This is the LZ4 algorithm.

+config CRYPTO_ZBEWALGO
+ tristate "zBeWalgo compression algorithm"
+ select CRYPTO_ALGAPI
+ select CRYPTO_ACOMP2
+ select ZBEWALGO_COMPRESS
+ help
+ This is the zBeWalgo compression algorithm. This algorithm
+ accepts only input sizes of at most one page at once.
+ To achieve high compression ratios zbewalgo can call multiple
+ transformation and compression algorithms in a row to optimize
+ the compressed size.
+
config CRYPTO_LZ4HC
tristate "LZ4HC compression algorithm"
select CRYPTO_ALGAPI
diff --git a/crypto/Makefile b/crypto/Makefile
index cdbc03b35..2a42fb289 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -121,6 +121,7 @@ obj-$(CONFIG_CRYPTO_CRCT10DIF) += crct10dif_common.o crct10dif_generic.o
obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.o authencesn.o
obj-$(CONFIG_CRYPTO_LZO) += lzo.o
obj-$(CONFIG_CRYPTO_LZ4) += lz4.o
+obj-$(CONFIG_CRYPTO_ZBEWALGO) += zbewalgo.o
obj-$(CONFIG_CRYPTO_LZ4HC) += lz4hc.o
obj-$(CONFIG_CRYPTO_842) += 842.o
obj-$(CONFIG_CRYPTO_RNG2) += rng.o
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index d5e23a142..294075476 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -3566,6 +3566,16 @@ static const struct alg_test_desc alg_test_descs[] = {
.dec = __VECS(tf_xts_dec_tv_template)
}
}
+ }, {
+ .alg = "zbewalgo",
+ .test = alg_test_comp,
+ .fips_allowed = 1,
+ .suite = {
+ .comp = {
+ .comp = __VECS(zbewalgo_comp_tv_template),
+ .decomp = __VECS(zbewalgo_decomp_tv_template)
+ }
+ }
}, {
.alg = "zlib-deflate",
.test = alg_test_comp,
diff --git a/crypto/testmgr.h b/crypto/testmgr.h
index 6044f6906..996d8321e 100644
--- a/crypto/testmgr.h
+++ b/crypto/testmgr.h
@@ -35133,6 +35133,140 @@ static const struct hash_testvec bfin_crc_tv_template[] = {

};

+static const struct comp_testvec zbewalgo_comp_tv_template[] = {
+ {
+ .inlen = 512,
+ .outlen = 402,
+ .input =
+ "\x8a\x3a\xf3\xbe\x33\xf9\xab\x3d\xa1\x51\x9f\x7f\xad\xf6\xab\x3d"
+ "\xad\x29\x8f\x3c\x27\xf4\xab\x3d\x06\x19\xc3\xf5\xa0\xf1\xab\x3d"
+ "\xfb\x75\x3b\xab\x1a\xef\xab\x3d\xe3\x96\xf8\x5c\x94\xec\xab\x3d"
+ "\x13\xd2\xfa\x0a\x0e\xea\xab\x3d\xe0\x7d\x42\xb5\x87\xe7\xab\x3d"
+ "\xa1\xf0\xcf\x5b\x01\xe5\xab\x3d\xad\x80\xa3\xfe\x7a\xe2\xab\x3d"
+ "\x59\x84\xbd\x9d\xf4\xdf\xab\x3d\xff\x51\x1e\x39\x6e\xdd\xab\x3d"
+ "\xf5\x3f\xc6\xd0\xe7\xda\xab\x3d\x96\xa4\xb5\x64\x61\xd8\xab\x3d"
+ "\x3b\xd6\xec\xf4\xda\xd5\xab\x3d\x3b\x2b\x6c\x81\x54\xd3\xab\x3d"
+ "\xf2\xf9\x33\x0a\xce\xd0\xab\x3d\xbb\x98\x44\x8f\x47\xce\xab\x3d"
+ "\xed\x5d\x9e\x10\xc1\xcb\xab\x3d\xe7\x9f\x41\x8e\x3a\xc9\xab\x3d"
+ "\x07\xb5\x2e\x08\xb4\xc6\xab\x3d\xa9\xf3\x65\x7e\x2d\xc4\xab\x3d"
+ "\x28\xb2\xe7\xf0\xa6\xc1\xab\x3d\xe3\x46\xb4\x5f\x20\xbf\xab\x3d"
+ "\x38\x08\xcc\xca\x99\xbc\xab\x3d\x85\x4c\x2f\x32\x13\xba\xab\x3d"
+ "\x2a\x6a\xde\x95\x8c\xb7\xab\x3d\x85\xb7\xd9\xf5\x05\xb5\xab\x3d"
+ "\xf7\x8a\x21\x52\x7f\xb2\xab\x3d\xe2\x3a\xb6\xaa\xf8\xaf\xab\x3d"
+ "\xa5\x1d\x98\xff\x71\xad\xab\x3d\xa3\x89\xc7\x50\xeb\xaa\xab\x3d"
+ "\x3d\xd5\x44\x9e\x64\xa8\xab\x3d\xd6\x56\x10\xe8\xdd\xa5\xab\x3d"
+ "\xce\x64\x2a\x2e\x57\xa3\xab\x3d\x8d\x55\x93\x70\xd0\xa0\xab\x3d"
+ "\x76\x7f\x4b\xaf\x49\x9e\xab\x3d\xeb\x38\x53\xea\xc2\x9b\xab\x3d"
+ "\x53\xd8\xaa\x21\x3c\x99\xab\x3d\x13\xb4\x52\x55\xb5\x96\xab\x3d"
+ "\x92\x22\x4b\x85\x2e\x94\xab\x3d\x35\x7a\x94\xb1\xa7\x91\xab\x3d"
+ "\x65\x11\x2f\xda\x20\x8f\xab\x3d\x86\x3e\x1b\xff\x99\x8c\xab\x3d"
+ "\x02\x58\x59\x20\x13\x8a\xab\x3d\x41\xb4\xe9\x3d\x8c\x87\xab\x3d"
+ "\xaf\xa9\xcc\x57\x05\x85\xab\x3d\xb5\x8e\x02\x6e\x7e\x82\xab\x3d"
+ "\xb9\xb9\x8b\x80\xf7\x7f\xab\x3d\x27\x81\x68\x8f\x70\x7d\xab\x3d"
+ "\x6a\x3b\x99\x9a\xe9\x7a\xab\x3d\xef\x3e\x1e\xa2\x62\x78\xab\x3d"
+ "\x20\xe2\xf7\xa5\xdb\x75\xab\x3d\x6a\x7b\x26\xa6\x54\x73\xab\x3d"
+ "\x3b\x61\xaa\xa2\xcd\x70\xab\x3d\xfe\xe9\x83\x9b\x46\x6e\xab\x3d"
+ "\x22\x6c\xb3\x90\xbf\x6b\xab\x3d\x16\x3e\x39\x82\x38\x69\xab\x3d"
+ "\x48\xb6\x15\x70\xb1\x66\xab\x3d\x26\x2b\x49\x5a\x2a\x64\xab\x3d"
+ "\x23\xf3\xd3\x40\xa3\x61\xab\x3d\xae\x64\xb6\x23\x1c\x5f\xab\x3d"
+ "\x37\xd6\xf0\x02\x95\x5c\xab\x3d\x30\x9e\x83\xde\x0d\x5a\xab\x3d",
+ .output =
+ "\x02\x02\x07\x02\x07\x00\x00\x00\x0f\x00\x02\x8a\xa1\xad\x06\xfb"
+ "\xe3\x13\xe0\xa1\xad\x59\xff\xf5\x96\x81\x3b\x7f\xf2\xbb\xed\xe7"
+ "\x07\xa9\x28\xe3\x38\x85\x2a\x85\xf7\xe2\xa5\xa3\x3d\xd6\xce\x8d"
+ "\x76\xeb\x53\x13\x92\x35\x65\x86\x02\x41\xaf\xb5\xb9\x27\x6a\xef"
+ "\x20\x6a\x3b\xfe\x22\x16\x48\x26\x23\xae\x37\x30\x3a\x51\x29\x19"
+ "\x75\x96\xd2\x7d\xf0\x80\x84\x51\x3f\xa4\xd6\x2b\xf9\x98\x5d\x9f"
+ "\xb5\xf3\xb2\x46\x08\x4c\x6a\xb7\x8a\x3a\x1d\x89\xd5\x56\x64\x55"
+ "\x7f\x38\xd8\xb4\x22\x7a\x11\x3e\x58\xb4\xa9\x8e\xb9\x81\x3b\x3e"
+ "\xe2\x7b\x61\xe9\x6c\x3e\xb6\x2b\xf3\x64\xd6\x9e\xf3\x9f\x8f\xc3"
+ "\x3b\xf8\xfa\x42\xcf\xa3\xbd\x1e\xc6\xb5\xec\x6c\x7f\x33\x44\x9e"
+ "\x41\x2e\x65\xe7\xb4\xcc\x2f\xde\xd9\x21\xb6\x98\xc7\x44\x10\x2a"
+ "\x93\x4b\x53\xaa\x52\x4b\x94\x2f\x1b\x59\xe9\xcc\x02\x8b\x68\x99"
+ "\x1e\xf7\x26\xaa\x83\xb3\x39\x15\x49\xd3\xb6\xf0\x83\xbe\x7f\x3c"
+ "\xf5\xab\x5c\x0a\xb5\x5b\xfe\x9d\x39\xd0\x64\xf4\x81\x0a\x8f\x10"
+ "\x8e\x08\x7e\xf0\x5f\xca\x32\x95\xf5\x52\xaa\xff\x50\x9e\xe8\x2e"
+ "\x70\xaf\xea\x21\x55\x85\xb1\xda\xff\x20\x3d\x57\x6e\x80\x8f\x9a"
+ "\xa2\xa5\xa6\xa2\x9b\x90\x82\x70\x5a\x40\x23\x02\xde\x33\xad\x27"
+ "\xa0\x1a\x94\x0e\x87\x01\x7a\xf4\x6e\xe7\x61\xda\x54\x6f\xce\x47"
+ "\xc1\x3a\xb4\x2d\xa6\x20\x99\x13\x8c\x05\x7f\xf8\x71\xeb\x64\xdd"
+ "\x57\xd0\x49\xc2\x3c\xb5\x2e\xa7\x20\x99\x13\x8c\x05\x7e\xf7\x70"
+ "\xe9\x62\xdb\x54\xcd\x46\xbf\x38\xb1\x2a\xa3\x1c\x95\x0d\xf9\xf6"
+ "\xf4\xf1\xef\xec\xea\xe7\xe5\xe2\xdf\xdd\xda\xd8\xd5\xd3\xd0\xce"
+ "\xcb\xc9\xc6\xc4\xc1\xbf\xbc\xba\xb7\xb5\xb2\xaf\xad\xaa\xa8\xa5"
+ "\xa3\xa0\x9e\x9b\x99\x96\x94\x91\x8f\x8c\x8a\x87\x85\x82\x7f\x7d"
+ "\x7a\x78\x75\x73\x70\x6e\x6b\x69\x66\x64\x61\x5f\x5c\x5a\xbf\xab"
+ "\xbf\x3d",
+ },
+};
+
+static const struct comp_testvec zbewalgo_decomp_tv_template[] = {
+ {
+ .inlen = 402,
+ .outlen = 512,
+ .input =
+ "\x02\x02\x07\x02\x07\x00\x00\x00\x0f\x00\x02\x8a\xa1\xad\x06\xfb"
+ "\xe3\x13\xe0\xa1\xad\x59\xff\xf5\x96\x81\x3b\x7f\xf2\xbb\xed\xe7"
+ "\x07\xa9\x28\xe3\x38\x85\x2a\x85\xf7\xe2\xa5\xa3\x3d\xd6\xce\x8d"
+ "\x76\xeb\x53\x13\x92\x35\x65\x86\x02\x41\xaf\xb5\xb9\x27\x6a\xef"
+ "\x20\x6a\x3b\xfe\x22\x16\x48\x26\x23\xae\x37\x30\x3a\x51\x29\x19"
+ "\x75\x96\xd2\x7d\xf0\x80\x84\x51\x3f\xa4\xd6\x2b\xf9\x98\x5d\x9f"
+ "\xb5\xf3\xb2\x46\x08\x4c\x6a\xb7\x8a\x3a\x1d\x89\xd5\x56\x64\x55"
+ "\x7f\x38\xd8\xb4\x22\x7a\x11\x3e\x58\xb4\xa9\x8e\xb9\x81\x3b\x3e"
+ "\xe2\x7b\x61\xe9\x6c\x3e\xb6\x2b\xf3\x64\xd6\x9e\xf3\x9f\x8f\xc3"
+ "\x3b\xf8\xfa\x42\xcf\xa3\xbd\x1e\xc6\xb5\xec\x6c\x7f\x33\x44\x9e"
+ "\x41\x2e\x65\xe7\xb4\xcc\x2f\xde\xd9\x21\xb6\x98\xc7\x44\x10\x2a"
+ "\x93\x4b\x53\xaa\x52\x4b\x94\x2f\x1b\x59\xe9\xcc\x02\x8b\x68\x99"
+ "\x1e\xf7\x26\xaa\x83\xb3\x39\x15\x49\xd3\xb6\xf0\x83\xbe\x7f\x3c"
+ "\xf5\xab\x5c\x0a\xb5\x5b\xfe\x9d\x39\xd0\x64\xf4\x81\x0a\x8f\x10"
+ "\x8e\x08\x7e\xf0\x5f\xca\x32\x95\xf5\x52\xaa\xff\x50\x9e\xe8\x2e"
+ "\x70\xaf\xea\x21\x55\x85\xb1\xda\xff\x20\x3d\x57\x6e\x80\x8f\x9a"
+ "\xa2\xa5\xa6\xa2\x9b\x90\x82\x70\x5a\x40\x23\x02\xde\x33\xad\x27"
+ "\xa0\x1a\x94\x0e\x87\x01\x7a\xf4\x6e\xe7\x61\xda\x54\x6f\xce\x47"
+ "\xc1\x3a\xb4\x2d\xa6\x20\x99\x13\x8c\x05\x7f\xf8\x71\xeb\x64\xdd"
+ "\x57\xd0\x49\xc2\x3c\xb5\x2e\xa7\x20\x99\x13\x8c\x05\x7e\xf7\x70"
+ "\xe9\x62\xdb\x54\xcd\x46\xbf\x38\xb1\x2a\xa3\x1c\x95\x0d\xf9\xf6"
+ "\xf4\xf1\xef\xec\xea\xe7\xe5\xe2\xdf\xdd\xda\xd8\xd5\xd3\xd0\xce"
+ "\xcb\xc9\xc6\xc4\xc1\xbf\xbc\xba\xb7\xb5\xb2\xaf\xad\xaa\xa8\xa5"
+ "\xa3\xa0\x9e\x9b\x99\x96\x94\x91\x8f\x8c\x8a\x87\x85\x82\x7f\x7d"
+ "\x7a\x78\x75\x73\x70\x6e\x6b\x69\x66\x64\x61\x5f\x5c\x5a\xbf\xab"
+ "\xbf\x3d",
+ .output =
+ "\x8a\x3a\xf3\xbe\x33\xf9\xab\x3d\xa1\x51\x9f\x7f\xad\xf6\xab\x3d"
+ "\xad\x29\x8f\x3c\x27\xf4\xab\x3d\x06\x19\xc3\xf5\xa0\xf1\xab\x3d"
+ "\xfb\x75\x3b\xab\x1a\xef\xab\x3d\xe3\x96\xf8\x5c\x94\xec\xab\x3d"
+ "\x13\xd2\xfa\x0a\x0e\xea\xab\x3d\xe0\x7d\x42\xb5\x87\xe7\xab\x3d"
+ "\xa1\xf0\xcf\x5b\x01\xe5\xab\x3d\xad\x80\xa3\xfe\x7a\xe2\xab\x3d"
+ "\x59\x84\xbd\x9d\xf4\xdf\xab\x3d\xff\x51\x1e\x39\x6e\xdd\xab\x3d"
+ "\xf5\x3f\xc6\xd0\xe7\xda\xab\x3d\x96\xa4\xb5\x64\x61\xd8\xab\x3d"
+ "\x3b\xd6\xec\xf4\xda\xd5\xab\x3d\x3b\x2b\x6c\x81\x54\xd3\xab\x3d"
+ "\xf2\xf9\x33\x0a\xce\xd0\xab\x3d\xbb\x98\x44\x8f\x47\xce\xab\x3d"
+ "\xed\x5d\x9e\x10\xc1\xcb\xab\x3d\xe7\x9f\x41\x8e\x3a\xc9\xab\x3d"
+ "\x07\xb5\x2e\x08\xb4\xc6\xab\x3d\xa9\xf3\x65\x7e\x2d\xc4\xab\x3d"
+ "\x28\xb2\xe7\xf0\xa6\xc1\xab\x3d\xe3\x46\xb4\x5f\x20\xbf\xab\x3d"
+ "\x38\x08\xcc\xca\x99\xbc\xab\x3d\x85\x4c\x2f\x32\x13\xba\xab\x3d"
+ "\x2a\x6a\xde\x95\x8c\xb7\xab\x3d\x85\xb7\xd9\xf5\x05\xb5\xab\x3d"
+ "\xf7\x8a\x21\x52\x7f\xb2\xab\x3d\xe2\x3a\xb6\xaa\xf8\xaf\xab\x3d"
+ "\xa5\x1d\x98\xff\x71\xad\xab\x3d\xa3\x89\xc7\x50\xeb\xaa\xab\x3d"
+ "\x3d\xd5\x44\x9e\x64\xa8\xab\x3d\xd6\x56\x10\xe8\xdd\xa5\xab\x3d"
+ "\xce\x64\x2a\x2e\x57\xa3\xab\x3d\x8d\x55\x93\x70\xd0\xa0\xab\x3d"
+ "\x76\x7f\x4b\xaf\x49\x9e\xab\x3d\xeb\x38\x53\xea\xc2\x9b\xab\x3d"
+ "\x53\xd8\xaa\x21\x3c\x99\xab\x3d\x13\xb4\x52\x55\xb5\x96\xab\x3d"
+ "\x92\x22\x4b\x85\x2e\x94\xab\x3d\x35\x7a\x94\xb1\xa7\x91\xab\x3d"
+ "\x65\x11\x2f\xda\x20\x8f\xab\x3d\x86\x3e\x1b\xff\x99\x8c\xab\x3d"
+ "\x02\x58\x59\x20\x13\x8a\xab\x3d\x41\xb4\xe9\x3d\x8c\x87\xab\x3d"
+ "\xaf\xa9\xcc\x57\x05\x85\xab\x3d\xb5\x8e\x02\x6e\x7e\x82\xab\x3d"
+ "\xb9\xb9\x8b\x80\xf7\x7f\xab\x3d\x27\x81\x68\x8f\x70\x7d\xab\x3d"
+ "\x6a\x3b\x99\x9a\xe9\x7a\xab\x3d\xef\x3e\x1e\xa2\x62\x78\xab\x3d"
+ "\x20\xe2\xf7\xa5\xdb\x75\xab\x3d\x6a\x7b\x26\xa6\x54\x73\xab\x3d"
+ "\x3b\x61\xaa\xa2\xcd\x70\xab\x3d\xfe\xe9\x83\x9b\x46\x6e\xab\x3d"
+ "\x22\x6c\xb3\x90\xbf\x6b\xab\x3d\x16\x3e\x39\x82\x38\x69\xab\x3d"
+ "\x48\xb6\x15\x70\xb1\x66\xab\x3d\x26\x2b\x49\x5a\x2a\x64\xab\x3d"
+ "\x23\xf3\xd3\x40\xa3\x61\xab\x3d\xae\x64\xb6\x23\x1c\x5f\xab\x3d"
+ "\x37\xd6\xf0\x02\x95\x5c\xab\x3d\x30\x9e\x83\xde\x0d\x5a\xab\x3d",
+ },
+};
+
static const struct comp_testvec lz4_comp_tv_template[] = {
{
.inlen = 255,
diff --git a/crypto/zbewalgo.c b/crypto/zbewalgo.c
new file mode 100644
index 000000000..044b88117
--- /dev/null
+++ b/crypto/zbewalgo.c
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018 Benjamin Warnke <4bwarnke@informatik.uni-hamburg.de>
+ */
+
+#include <crypto/internal/scompress.h>
+#include <linux/crypto.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+#include <linux/zbewalgo.h>
+
+struct zbewalgo_ctx {
+ void *zbewalgo_comp_mem;
+};
+
+static void *zbewalgo_alloc_ctx(struct crypto_scomp *tfm)
+{
+ void *ctx;
+
+ ctx = vmalloc(zbewalgo_get_wrkmem_size());
+ if (!ctx)
+ return ERR_PTR(-ENOMEM);
+ return ctx;
+}
+
+static int zbewalgo_init(struct crypto_tfm *tfm)
+{
+ struct zbewalgo_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ ctx->zbewalgo_comp_mem = zbewalgo_alloc_ctx(NULL);
+ if (IS_ERR(ctx->zbewalgo_comp_mem))
+ return -ENOMEM;
+ return 0;
+}
+
+static void zbewalgo_free_ctx(struct crypto_scomp *tfm, void *ctx)
+{
+ vfree(ctx);
+}
+
+static void zbewalgo_exit(struct crypto_tfm *tfm)
+{
+ struct zbewalgo_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ zbewalgo_free_ctx(NULL, ctx->zbewalgo_comp_mem);
+}
+
+static int __zbewalgo_compress_crypto(const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int *dlen, void *ctx)
+{
+ int out_len;
+
+ if (slen > 4096)
+ return -EINVAL;
+ out_len = zbewalgo_compress(src, dst, ctx, slen);
+ if (!out_len)
+ return -EINVAL;
+ *dlen = out_len;
+ return 0;
+}
+
+static int zbewalgo_scompress(struct crypto_scomp *tfm, const u8 *src,
+ unsigned int slen, u8 *dst, unsigned int *dlen,
+ void *ctx)
+{
+ return __zbewalgo_compress_crypto(src, slen, dst, dlen, ctx);
+}
+
+static int zbewalgo_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
+ unsigned int slen, u8 *dst,
+ unsigned int *dlen)
+{
+ struct zbewalgo_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ return __zbewalgo_compress_crypto(src, slen, dst, dlen,
+ ctx->zbewalgo_comp_mem);
+}
+
+static int __zbewalgo_decompress_crypto(const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int *dlen, void *ctx)
+{
+ int out_len;
+
+ out_len = zbewalgo_decompress_safe(src, dst, ctx, slen);
+ if (out_len < 0)
+ return -EINVAL;
+ *dlen = out_len;
+ return 0;
+}
+
+static int zbewalgo_sdecompress(struct crypto_scomp *tfm, const u8 *src,
+ unsigned int slen, u8 *dst, unsigned int *dlen,
+ void *ctx)
+{
+ return __zbewalgo_decompress_crypto(src, slen, dst, dlen, ctx);
+}
+
+static int zbewalgo_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
+ unsigned int slen, u8 *dst,
+ unsigned int *dlen)
+{
+ struct zbewalgo_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ return __zbewalgo_decompress_crypto(src, slen, dst, dlen,
+ ctx->zbewalgo_comp_mem);
+}
+
+static struct crypto_alg crypto_alg_zbewalgo = {
+ .cra_name = "zbewalgo",
+ .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
+ .cra_ctxsize = sizeof(struct zbewalgo_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_init = zbewalgo_init,
+ .cra_exit = zbewalgo_exit,
+ .cra_u = {
+ .compress = {
+ .coa_compress = zbewalgo_compress_crypto,
+ .coa_decompress = zbewalgo_decompress_crypto
+ }
+ }
+};
+
+static struct scomp_alg scomp = {
+ .alloc_ctx = zbewalgo_alloc_ctx,
+ .free_ctx = zbewalgo_free_ctx,
+ .compress = zbewalgo_scompress,
+ .decompress = zbewalgo_sdecompress,
+ .base = {
+ .cra_name = "zbewalgo",
+ .cra_driver_name = "zbewalgo-scomp",
+ .cra_module = THIS_MODULE,
+ }
+};
+
+static int __init zbewalgo_mod_init(void)
+{
+ int ret;
+
+ ret = crypto_register_alg(&crypto_alg_zbewalgo);
+ if (ret)
+ return ret;
+ ret = crypto_register_scomp(&scomp);
+ if (ret) {
+ crypto_unregister_alg(&crypto_alg_zbewalgo);
+ return ret;
+ }
+ return ret;
+}
+
+static void __exit zbewalgo_mod_fini(void)
+{
+ crypto_unregister_alg(&crypto_alg_zbewalgo);
+ crypto_unregister_scomp(&scomp);
+}
+
+module_init(zbewalgo_mod_init);
+module_exit(zbewalgo_mod_fini);
+
+MODULE_AUTHOR("Benjamin Warnke <4bwarnke@informatik.uni-hamburg.de>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("zBeWalgo Compression Algorithm");
+MODULE_ALIAS_CRYPTO("zbewalgo");
diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
index 4ed0a78fd..15b3a0162 100644
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -23,6 +23,9 @@ static const char * const backends[] = {
#if IS_ENABLED(CONFIG_CRYPTO_LZ4)
"lz4",
#endif
+#if IS_ENABLED(CONFIG_CRYPTO_ZBEWALGO)
+ "zbewalgo",
+#endif
#if IS_ENABLED(CONFIG_CRYPTO_LZ4HC)
"lz4hc",
#endif
diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index 31762db86..84dee5383 100644
--- a/drivers/block/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
@@ -27,7 +27,9 @@
* Pages that compress to size greater than this are stored
* uncompressed in memory.
*/
-static const size_t max_zpage_size = PAGE_SIZE / 4 * 3;
+static const size_t max_zpage_size =
+ 3264 /* largest reported size_class by zsmalloc */
+ - (sizeof(unsigned long)); /* zsmalloc internal overhead */

/*
* NOTE: max_zpage_size must be less than or equal to:
--
2.14.1
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