This patch add two functions for allocating a freeing
dynamically allocated per-cpu transform structures.
Signed-off-by: Seth Jennings <sjenn...@linux.vnet.ibm.com>
---
crypto/api.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 62 insertions(+), 0 deletions(-)
diff --git a/crypto/api.c b/crypto/api.c
index 033a714..f95b3f9 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -602,5 +602,67 @@ int crypto_has_alg(const char *name, u32 type, u32 mask)
}
EXPORT_SYMBOL_GPL(crypto_has_alg);
+/*
+ * Per-cpu crypto helpers
+ *
+ * crypto_alloc_percpu_tfms() and crypto_free_percpu_tfms() are used for
+ * allocating tfms on a per-cpu basis. The set of cpus the tfms are
+ * allocated/freed on is determined by the cpumask (see linux/cpumask.h).
+ * If the cpu_possible_mask is used, then the user has a tfm for every cpu
+ * that could ever possibly enabled. However, if the user calls with cpumask
+ * cpu_online_mask or cpu_present_mask with HOTPLUG enabled, the user
+ * must register a cpu notifier to allocate/free the tfm for dynamically
+ * added/removed cpus.
+*/
+void crypto_free_percpu_tfms(struct crypto_tfm * __percpu *tfms,
+ const struct cpumask *cpumask)
+{
+ int cpu;
+ struct crypto_tfm *tfm;
+
+ if (!tfms)
+ return;
+
+ for_each_cpu(cpu, cpumask) {
+ tfm = *per_cpu_ptr(tfms, cpu);
+ if (!tfm)
+ continue;
+ crypto_free_tfm(tfm);
+ *per_cpu_ptr(tfms, cpu) = NULL;
+ }
+
+ free_percpu(tfms);
+}
+EXPORT_SYMBOL_GPL(crypto_free_percpu_tfms);
+
+struct crypto_tfm * __percpu *crypto_alloc_percpu_tfms(const char *alg_name,
+ u32 type, u32 mask, const struct cpumask *cpumask)
+{
+ int cpu, err;
+ struct crypto_tfm * __percpu *tfms, *tfm;
+
+ tfms = alloc_percpu(struct crypto_tfm *);
+ if (!tfms) {
+ err = -ENOMEM;
+ goto error;
+ }
+
+ for_each_cpu(cpu, cpumask) {
+ tfm = crypto_alloc_base(alg_name, type, mask);
+ if (IS_ERR(tfm)) {
+ err = PTR_ERR(tfm);
+ goto error;
+ }
+ *per_cpu_ptr(tfms, cpu) = tfm;
+ }
+ return tfms;
+
+error:
+ if (tfms)
+ crypto_free_percpu_tfms(tfms, cpumask);
+ return (struct crypto_tfm * __percpu *)(ERR_PTR(err));
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_percpu_tfms);
+
MODULE_DESCRIPTION("Cryptographic core API");
MODULE_LICENSE("GPL");
--
1.7.5.4
--
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