env: add spdk_realloc()

It's a copy of spdk_dma_realloc() matching the new
spdk_malloc() naming convention.

Change-Id: I8e1b24aa0bae064392fe0f4ebc08c5723d9a5f1a
Signed-off-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/448169
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>

include/spdk/env.h

@@ -130,6 +130,21 @@ void *spdk_malloc(size_t size, size_t align, uint64_t *phys_addr, int socket_id,
  */
 void *spdk_zmalloc(size_t size, size_t align, uint64_t *phys_addr, int socket_id, uint32_t flags);
 
+/**
+ * Resize a dma/sharable memory buffer with the given new size and alignment.
+ * Existing contents are preserved.
+ *
+ * \param buf Buffer to resize.
+ * \param size Size in bytes.
+ * \param align Alignment value for the allocated memory. If '0', the allocated
+ * buffer is suitably aligned (in the same manner as malloc()). Otherwise, the
+ * allocated buffer is aligned to the multiple of align. In this case, it must
+ * be a power of two.
+ *
+ * \return a pointer to the resized memory buffer.
+ */
+void *spdk_realloc(void *buf, size_t size, size_t align);
+
 /**
  * Free buffer memory that was previously allocated with spdk_malloc() or spdk_zmalloc().
  *

lib/env_dpdk/env.c

@@ -89,6 +89,12 @@ spdk_zmalloc(size_t size, size_t align, uint64_t *phys_addr, int socket_id, uint
 	return buf;
 }
 
+void *
+spdk_realloc(void *buf, size_t size, size_t align)
+{
+	return rte_realloc(buf, size, align);
+}
+
 void
 spdk_free(void *buf)
 {

test/common/lib/test_env.c

@@ -114,6 +114,15 @@ spdk_dma_malloc(size_t size, size_t align, uint64_t *phys_addr)
 	return spdk_malloc(size, align, phys_addr, -1, 1);
 }
 
+DEFINE_RETURN_MOCK(spdk_realloc, void *);
+void *
+spdk_realloc(void *buf, size_t size, size_t align)
+{
+	HANDLE_RETURN_MOCK(spdk_realloc);
+
+	return realloc(buf, size);
+}
+
 DEFINE_RETURN_MOCK(spdk_dma_zmalloc, void *);
 void *
 spdk_dma_zmalloc(size_t size, size_t align, uint64_t *phys_addr)