[src/trunk]: src/sys/arch/xen/xen Use an independent pool, don't steal pages ...

[maxv <maxv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/9e688847301c
branches:  trunk
changeset: 363722:9e688847301c
user:      maxv <maxv%NetBSD.org@localhost>
date:      Thu Aug 09 17:32:44 2018 +0000

description:
Use an independent pool, don't steal pages from mcl_cache. This was a bad
hack.

No particular functional change, since the (MCLBYTES != PAGE_SIZE)
condition is already true.

diffstat:

 sys/arch/xen/xen/xennetback_xenbus.c |  20 +++++---------------
 1 files changed, 5 insertions(+), 15 deletions(-)

diffs (66 lines):

diff -r 6df6668488ef -r 9e688847301c sys/arch/xen/xen/xennetback_xenbus.c
--- a/sys/arch/xen/xen/xennetback_xenbus.c      Thu Aug 09 17:26:00 2018 +0000
+++ b/sys/arch/xen/xen/xennetback_xenbus.c      Thu Aug 09 17:32:44 2018 +0000
@@ -1,4 +1,4 @@
-/*      $NetBSD: xennetback_xenbus.c,v 1.66 2018/08/09 17:26:00 maxv Exp $      */
+/*      $NetBSD: xennetback_xenbus.c,v 1.67 2018/08/09 17:32:44 maxv Exp $      */
 
 /*
  * Copyright (c) 2006 Manuel Bouyer.
@@ -25,7 +25,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: xennetback_xenbus.c,v 1.66 2018/08/09 17:26:00 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: xennetback_xenbus.c,v 1.67 2018/08/09 17:32:44 maxv Exp $");
 
 #include "opt_xen.h"
 
@@ -173,13 +173,9 @@
 
 /*
  * If we can't transfer the mbuf directly, we have to copy it to a page which
- * will be transferred to the remote domain. We use a pool_cache
- * for this, or the mbuf cluster pool cache if MCLBYTES == PAGE_SIZE
+ * will be transferred to the remote domain. We use a pool_cache for this.
  */
-#if MCLBYTES != PAGE_SIZE
 pool_cache_t xmit_pages_cache;
-#endif
-pool_cache_t xmit_pages_cachep;
 
 /* arrays used in xennetback_ifstart(), too large to allocate on stack */
 /* XXXSMP */
@@ -227,13 +223,8 @@
        /* initialise pools */
        pool_init(&xni_pkt_pool, sizeof(struct xni_pkt), 0, 0, 0,
            "xnbpkt", NULL, IPL_VM);
-#if MCLBYTES != PAGE_SIZE
        xmit_pages_cache = pool_cache_init(PAGE_SIZE, 0, 0, 0, "xnbxm", NULL,
            IPL_VM, NULL, NULL, NULL);
-       xmit_pages_cachep = xmit_pages_cache;
-#else
-       xmit_pages_cachep = mcl_cache;
-#endif
 
        SLIST_INIT(&xnetback_instances);
        mutex_init(&xnetback_lock, MUTEX_DEFAULT, IPL_NONE);
@@ -1048,8 +1039,7 @@
                        } else {
                                /* we have to copy the packet */
                                xmit_va = (vaddr_t)pool_cache_get_paddr(
-                                   xmit_pages_cachep,
-                                   PR_NOWAIT, &xmit_pa);
+                                   xmit_pages_cache, PR_NOWAIT, &xmit_pa);
                                if (__predict_false(xmit_va == 0))
                                        break; /* out of memory */
 
@@ -1185,7 +1175,7 @@
                                m_freem(mbufs_sent[j]);
                        }
                        for (j = 0; j < nppitems; j++) {
-                               pool_cache_put_paddr(xmit_pages_cachep,
+                               pool_cache_put_paddr(xmit_pages_cache,
                                    (void *)pages_pool_free[j].va,
                                    pages_pool_free[j].pa);
                        }