crypto: cryptd - Add cryptd_max_cpu_qlen module parameter

Make the cryptd queue length configurable. We recently had customer where this
needed to be tuned to accommodate the aesni_intel module and prevent packet
drop.

Signed-off-by: Jon Maxwell <jmaxwell37@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/cryptd.c

@@ -32,7 +32,9 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 
-#define CRYPTD_MAX_CPU_QLEN 1000
+unsigned int cryptd_max_cpu_qlen = 1000;
+module_param(cryptd_max_cpu_qlen, uint, 0);
+MODULE_PARM_DESC(cryptd_max_cpu_qlen, "Set cryptd Max queue depth");
 
 struct cryptd_cpu_queue {
 	struct crypto_queue queue;
@@ -116,6 +118,7 @@ static int cryptd_init_queue(struct cryptd_queue *queue,
 		crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
 		INIT_WORK(&cpu_queue->work, cryptd_queue_worker);
 	}
+	pr_info("cryptd: max_cpu_qlen set to %d\n", max_cpu_qlen);
 	return 0;
 }
 
@@ -1372,7 +1375,7 @@ static int __init cryptd_init(void)
 {
 	int err;
 
-	err = cryptd_init_queue(&queue, CRYPTD_MAX_CPU_QLEN);
+	err = cryptd_init_queue(&queue, cryptd_max_cpu_qlen);
 	if (err)
 		return err;