[package] base-files, ppp: fix interface shutdown

[openwrt.git] / target / linux / generic-2.6 / files / crypto / ocf / crypto.c

diff --git a/target/linux/generic-2.6/files/crypto/ocf/crypto.c b/target/linux/generic-2.6/files/crypto/ocf/crypto.c
index 5121b3d..9735f0c 100644 (file)
--- a/target/linux/generic-2.6/files/crypto/ocf/crypto.c
+++ b/target/linux/generic-2.6/files/crypto/ocf/crypto.c
@@ -1,6 +1,6 @@
 /*-
- * Linux port done by David McCullough <david_mccullough@securecomputing.com>
- * Copyright (C) 2006-2007 David McCullough
+ * Linux port done by David McCullough <david_mccullough@mcafee.com>
+ * Copyright (C) 2006-2010 David McCullough
  * Copyright (C) 2004-2005 Intel Corporation.
  * The license and original author are listed below.
  *
@@ -139,6 +139,9 @@ struct cryptocap {
 #define CRYPTOCAP_F_CLEANUP    0x80000000      /* needs resource cleanup */
        int             cc_qblocked;            /* (q) symmetric q blocked */
        int             cc_kqblocked;           /* (q) asymmetric q blocked */
+
+       int             cc_unqblocked;          /* (q) symmetric q blocked */
+       int             cc_unkqblocked;         /* (q) asymmetric q blocked */
 };
 static struct cryptocap *crypto_drivers = NULL;
 static int crypto_drivers_num = 0;
@@ -207,6 +210,11 @@ static struct kmem_cache *cryptop_zone;
 static struct kmem_cache *cryptodesc_zone;
 #endif
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27)
+#include <linux/sched.h>
+#define        kill_proc(p,s,v)        send_sig(s,find_task_by_vpid(p),0)
+#endif
+
 #define debug crypto_debug
 int crypto_debug = 0;
 module_param(crypto_debug, int, 0644);
@@ -255,6 +263,18 @@ module_param(crypto_devallowsoft, int, 0644);
 MODULE_PARM_DESC(crypto_devallowsoft,
           "Enable/disable use of software crypto support");
 
+/*
+ * This parameter controls the maximum number of crypto operations to 
+ * do consecutively in the crypto kernel thread before scheduling to allow 
+ * other processes to run. Without it, it is possible to get into a 
+ * situation where the crypto thread never allows any other processes to run.
+ * Default to 1000 which should be less than one second.
+ */
+static int crypto_max_loopcount = 1000;
+module_param(crypto_max_loopcount, int, 0644);
+MODULE_PARM_DESC(crypto_max_loopcount,
+          "Maximum number of crypto ops to do before yielding to other processes");
+
 static pid_t   cryptoproc = (pid_t) -1;
 static struct  completion cryptoproc_exited;
 static DECLARE_WAIT_QUEUE_HEAD(cryptoproc_wait);
@@ -760,10 +780,12 @@ crypto_unblock(u_int32_t driverid, int what)
        if (cap != NULL) {
                if (what & CRYPTO_SYMQ) {
                        cap->cc_qblocked = 0;
+                       cap->cc_unqblocked = 0;
                        crypto_all_qblocked = 0;
                }
                if (what & CRYPTO_ASYMQ) {
                        cap->cc_kqblocked = 0;
+                       cap->cc_unkqblocked = 0;
                        crypto_all_kqblocked = 0;
                }
                if (crp_sleep)
@@ -798,6 +820,10 @@ crypto_dispatch(struct cryptop *crp)
        }
        crypto_q_cnt++;
 
+       /* make sure we are starting a fresh run on this crp. */
+       crp->crp_flags &= ~CRYPTO_F_DONE;
+       crp->crp_etype = 0;
+
        /*
         * Caller marked the request to be processed immediately; dispatch
         * it directly to the driver unless the driver is currently blocked.
@@ -809,12 +835,14 @@ crypto_dispatch(struct cryptop *crp)
                KASSERT(cap != NULL, ("%s: Driver disappeared.", __func__));
                if (!cap->cc_qblocked) {
                        crypto_all_qblocked = 0;
-                       crypto_drivers[hid].cc_qblocked = 1;
+                       crypto_drivers[hid].cc_unqblocked = 1;
                        CRYPTO_Q_UNLOCK();
                        result = crypto_invoke(cap, crp, 0);
                        CRYPTO_Q_LOCK();
-                       if (result != ERESTART)
-                               crypto_drivers[hid].cc_qblocked = 0;
+                       if (result == ERESTART)
+                               if (crypto_drivers[hid].cc_unqblocked)
+                                       crypto_drivers[hid].cc_qblocked = 1;
+                       crypto_drivers[hid].cc_unqblocked = 0;
                }
        }
        if (result == ERESTART) {
@@ -829,13 +857,15 @@ crypto_dispatch(struct cryptop *crp)
                 */
                list_add(&crp->crp_next, &crp_q);
                cryptostats.cs_blocks++;
+               result = 0;
        } else if (result == -1) {
                TAILQ_INSERT_TAIL(&crp_q, crp, crp_next);
+               result = 0;
        }
        if (crp_sleep)
                wake_up_interruptible(&cryptoproc_wait);
        CRYPTO_Q_UNLOCK();
-       return 0;
+       return result;
 }
 
 /*
@@ -1246,6 +1276,7 @@ crypto_proc(void *arg)
        u_int32_t hid;
        int result, hint;
        unsigned long q_flags;
+       int loopcount = 0;
 
        ocf_daemonize("crypto");
 
@@ -1306,7 +1337,7 @@ crypto_proc(void *arg)
                        hid = CRYPTO_SESID2HID(submit->crp_sid);
                        crypto_all_qblocked = 0;
                        list_del(&submit->crp_next);
-                       crypto_drivers[hid].cc_qblocked = 1;
+                       crypto_drivers[hid].cc_unqblocked = 1;
                        cap = crypto_checkdriver(hid);
                        CRYPTO_Q_UNLOCK();
                        KASSERT(cap != NULL, ("%s:%u Driver disappeared.",
@@ -1326,8 +1357,11 @@ crypto_proc(void *arg)
                                /* XXX validate sid again? */
                                list_add(&submit->crp_next, &crp_q);
                                cryptostats.cs_blocks++;
-                       } else
-                               crypto_drivers[hid].cc_qblocked=0;
+                               if (crypto_drivers[hid].cc_unqblocked)
+                                       crypto_drivers[hid].cc_qblocked=0;
+                               crypto_drivers[hid].cc_unqblocked=0;
+                       }
+                       crypto_drivers[hid].cc_unqblocked = 0;
                }
 
                crypto_all_kqblocked = !list_empty(&crp_kq);
@@ -1396,6 +1430,7 @@ crypto_proc(void *arg)
                                        __FUNCTION__,
                                        list_empty(&crp_q), crypto_all_qblocked,
                                        list_empty(&crp_kq), crypto_all_kqblocked);
+                       loopcount = 0;
                        CRYPTO_Q_UNLOCK();
                        crp_sleep = 1;
                        wait_event_interruptible(cryptoproc_wait,
@@ -1417,7 +1452,15 @@ crypto_proc(void *arg)
                        if (cryptoproc == (pid_t) -1)
                                break;
                        cryptostats.cs_intrs++;
+               } else if (loopcount > crypto_max_loopcount) {
+                       /*
+                        * Give other processes a chance to run if we've 
+                        * been using the CPU exclusively for a while.
+                        */
+                       loopcount = 0;
+                       schedule();
                }
+               loopcount++;
        }
        CRYPTO_Q_UNLOCK();
        complete_and_exit(&cryptoproc_exited, 0);
@@ -1599,7 +1642,7 @@ crypto_init(void)
 {
        int error;
 
-       dprintk("%s(0x%x)\n", __FUNCTION__, (int) crypto_init);
+       dprintk("%s(%p)\n", __FUNCTION__, (void *) crypto_init);
 
        if (crypto_initted)
                return 0;
@@ -1737,5 +1780,5 @@ module_init(crypto_init);
 module_exit(crypto_exit);
 
 MODULE_LICENSE("BSD");
-MODULE_AUTHOR("David McCullough <david_mccullough@securecomputing.com>");
+MODULE_AUTHOR("David McCullough <david_mccullough@mcafee.com>");
 MODULE_DESCRIPTION("OCF (OpenBSD Cryptographic Framework)");