ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/lib/crc-t10dif.c b/marvell/linux/lib/crc-t10dif.c
new file mode 100644
index 0000000..c9acf1c
--- /dev/null
+++ b/marvell/linux/lib/crc-t10dif.c
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * T10 Data Integrity Field CRC16 calculation
+ *
+ * Copyright (c) 2007 Oracle Corporation. All rights reserved.
+ * Written by Martin K. Petersen <martin.petersen@oracle.com>
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/crc-t10dif.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <crypto/hash.h>
+#include <crypto/algapi.h>
+#include <linux/static_key.h>
+#include <linux/notifier.h>
+
+static struct crypto_shash __rcu *crct10dif_tfm;
+static struct static_key crct10dif_fallback __read_mostly;
+static DEFINE_MUTEX(crc_t10dif_mutex);
+static struct work_struct crct10dif_rehash_work;
+
+static int crc_t10dif_notify(struct notifier_block *self, unsigned long val, void *data)
+{
+ struct crypto_alg *alg = data;
+
+ if (val != CRYPTO_MSG_ALG_LOADED ||
+ static_key_false(&crct10dif_fallback) ||
+ strncmp(alg->cra_name, CRC_T10DIF_STRING, strlen(CRC_T10DIF_STRING)))
+ return 0;
+
+ schedule_work(&crct10dif_rehash_work);
+ return 0;
+}
+
+static void crc_t10dif_rehash(struct work_struct *work)
+{
+ struct crypto_shash *new, *old;
+
+ mutex_lock(&crc_t10dif_mutex);
+ old = rcu_dereference_protected(crct10dif_tfm,
+ lockdep_is_held(&crc_t10dif_mutex));
+ if (!old) {
+ mutex_unlock(&crc_t10dif_mutex);
+ return;
+ }
+ new = crypto_alloc_shash("crct10dif", 0, 0);
+ if (IS_ERR(new)) {
+ mutex_unlock(&crc_t10dif_mutex);
+ return;
+ }
+ rcu_assign_pointer(crct10dif_tfm, new);
+ mutex_unlock(&crc_t10dif_mutex);
+
+ synchronize_rcu();
+ crypto_free_shash(old);
+}
+
+static struct notifier_block crc_t10dif_nb = {
+ .notifier_call = crc_t10dif_notify,
+};
+
+__u16 crc_t10dif_update(__u16 crc, const unsigned char *buffer, size_t len)
+{
+ struct {
+ struct shash_desc shash;
+ char ctx[2];
+ } desc;
+ int err;
+
+ if (static_key_false(&crct10dif_fallback))
+ return crc_t10dif_generic(crc, buffer, len);
+
+ rcu_read_lock();
+ desc.shash.tfm = rcu_dereference(crct10dif_tfm);
+ *(__u16 *)desc.ctx = crc;
+
+ err = crypto_shash_update(&desc.shash, buffer, len);
+ rcu_read_unlock();
+
+ BUG_ON(err);
+
+ return *(__u16 *)desc.ctx;
+}
+EXPORT_SYMBOL(crc_t10dif_update);
+
+__u16 crc_t10dif(const unsigned char *buffer, size_t len)
+{
+ return crc_t10dif_update(0, buffer, len);
+}
+EXPORT_SYMBOL(crc_t10dif);
+
+static int __init crc_t10dif_mod_init(void)
+{
+ struct crypto_shash *tfm;
+
+ INIT_WORK(&crct10dif_rehash_work, crc_t10dif_rehash);
+ crypto_register_notifier(&crc_t10dif_nb);
+ mutex_lock(&crc_t10dif_mutex);
+ tfm = crypto_alloc_shash("crct10dif", 0, 0);
+ if (IS_ERR(tfm)) {
+ static_key_slow_inc(&crct10dif_fallback);
+ tfm = NULL;
+ }
+ RCU_INIT_POINTER(crct10dif_tfm, tfm);
+ mutex_unlock(&crc_t10dif_mutex);
+ return 0;
+}
+
+static void __exit crc_t10dif_mod_fini(void)
+{
+ crypto_unregister_notifier(&crc_t10dif_nb);
+ cancel_work_sync(&crct10dif_rehash_work);
+ crypto_free_shash(rcu_dereference_protected(crct10dif_tfm, 1));
+}
+
+module_init(crc_t10dif_mod_init);
+module_exit(crc_t10dif_mod_fini);
+
+static int crc_t10dif_transform_show(char *buffer, const struct kernel_param *kp)
+{
+ struct crypto_shash *tfm;
+ const char *name;
+ int len;
+
+ if (static_key_false(&crct10dif_fallback))
+ return sprintf(buffer, "fallback\n");
+
+ rcu_read_lock();
+ tfm = rcu_dereference(crct10dif_tfm);
+ if (!tfm) {
+ len = sprintf(buffer, "init\n");
+ goto unlock;
+ }
+
+ name = crypto_tfm_alg_driver_name(crypto_shash_tfm(tfm));
+ len = sprintf(buffer, "%s\n", name);
+
+unlock:
+ rcu_read_unlock();
+
+ return len;
+}
+
+module_param_call(transform, NULL, crc_t10dif_transform_show, NULL, 0644);
+
+MODULE_DESCRIPTION("T10 DIF CRC calculation");
+MODULE_LICENSE("GPL");
+MODULE_SOFTDEP("pre: crct10dif");