[Cryptodev-linux-devel] [PATCH 6/8] increase the number of slots for asynchronous completion dynamically

[Phil Sutter]

---
 cryptodev_main.c |   20 ++++++++++++++++----
 1 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/cryptodev_main.c b/cryptodev_main.c
index 6ab235f..09d2c41 100644
--- a/cryptodev_main.c
+++ b/cryptodev_main.c
@@ -53,9 +53,10 @@ MODULE_LICENSE("GPL");
 
 #define CRYPTODEV_STATS
 
-/* Default (pre-allocated) size of the job queue.
+/* Default (pre-allocated) and maximum size of the job queue.
  * These are free, pending and done items all together. */
 #define DEF_COP_RINGSIZE 16
+#define MAX_COP_RINGSIZE 64
 
 /* ====== Module parameters ====== */
 
@@ -866,21 +867,32 @@ clonefd(struct file *filp)
  *
  * returns:
  * -EBUSY when there are no free queue slots left
+ *        (and the number of slots has reached it MAX_COP_RINGSIZE)
+ * -EFAULT when there was a memory allocation error
  * 0 on success */
 static int crypto_async_run(struct crypt_priv *pcr, struct kernel_crypt_op 
*kcop)
 {
        struct todo_list_item *item = NULL;
 
        mutex_lock(&pcr->free.lock);
-       if (!list_empty(&pcr->free.list)) {
+       if (likely(!list_empty(&pcr->free.list))) {
                item = list_first_entry(&pcr->free.list,
                                struct todo_list_item, __hook);
                list_del(&item->__hook);
+       } else if (pcr->itemcount < MAX_COP_RINGSIZE) {
+               pcr->itemcount++;
+       } else {
+               mutex_unlock(&pcr->free.lock);
+               return -EBUSY;
        }
        mutex_unlock(&pcr->free.lock);
 
-       if (!item) {
-               return -EBUSY;
+       if (unlikely(!item)) {
+               item = kzalloc(sizeof(struct todo_list_item), GFP_KERNEL);
+               if (unlikely(!item))
+                       return -EFAULT;
+               dprintk(1, KERN_INFO, "%s: increased item count to %d\n",
+                               __func__, pcr->itemcount);
        }
 
        memcpy(&item->kcop, kcop, sizeof(struct kernel_crypt_op));
-- 
1.7.2.2



_______________________________________________
Cryptodev-linux-devel mailing list
Cryptodev-linux-devel@gna.org
https://mail.gna.org/listinfo/cryptodev-linux-devel