git: 13b9f78e33c9 - stable/15 - netmap: Let memory allocator parameters be settable via loader.conf

The branch stable/15 has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=13b9f78e33c9cdbcd7312afff9f1d5f1bd29f400

commit 13b9f78e33c9cdbcd7312afff9f1d5f1bd29f400
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2025-12-14 15:47:48 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2025-12-29 14:31:30 +0000

    netmap: Let memory allocator parameters be settable via loader.conf
    
    This is useful when dev.netmap.port_numa_affinity is set to 1.  When
    interfaces attach, they get a memory allocator that is copied from
    nm_mem.  Parameters in nm_mem can be set using sysctls, but this happens
    after their values are copied.
    
    To work around this, we can make it possible to set these memory
    parameters as tunables.
    
    Reviewed by:    vmaffione
    MFC after:      1 week
    Sponsored by:   Klara, Inc.
    Differential Revision:  https://reviews.freebsd.org/D54178
    
    (cherry picked from commit c694122f3cfb7d52b882fa79086d49f45a2c7fd2)
---
 sys/dev/netmap/netmap_mem2.c | 34 +++++++++++++++++++---------------
 1 file changed, 19 insertions(+), 15 deletions(-)

diff --git a/sys/dev/netmap/netmap_mem2.c b/sys/dev/netmap/netmap_mem2.c
index d69e9305f6f0..865a663da364 100644
--- a/sys/dev/netmap/netmap_mem2.c
+++ b/sys/dev/netmap/netmap_mem2.c
@@ -628,22 +628,26 @@ static const struct netmap_mem_d nm_blueprint = {
 
 #define STRINGIFY(x) #x
 
-#define DECLARE_SYSCTLS(id, name) \
-	SYSBEGIN(mem2_ ## name); \
-	SYSCTL_INT(_dev_netmap, OID_AUTO, name##_size, \
-	    CTLFLAG_RW, &nm_mem.params[id].size, 0, "Requested size of netmap " STRINGIFY(name) "s"); \
-	SYSCTL_INT(_dev_netmap, OID_AUTO, name##_curr_size, \
-	    CTLFLAG_RD, &nm_mem.pools[id]._objsize, 0, "Current size of netmap " STRINGIFY(name) "s"); \
-	SYSCTL_INT(_dev_netmap, OID_AUTO, name##_num, \
-	    CTLFLAG_RW, &nm_mem.params[id].num, 0, "Requested number of netmap " STRINGIFY(name) "s"); \
-	SYSCTL_INT(_dev_netmap, OID_AUTO, name##_curr_num, \
-	    CTLFLAG_RD, &nm_mem.pools[id].objtotal, 0, "Current number of netmap " STRINGIFY(name) "s"); \
-	SYSCTL_INT(_dev_netmap, OID_AUTO, priv_##name##_size, \
-	    CTLFLAG_RW, &netmap_min_priv_params[id].size, 0, \
+#define DECLARE_SYSCTLS(id, name)				\
+	SYSBEGIN(mem2_ ## name);				\
+	SYSCTL_INT(_dev_netmap, OID_AUTO, name##_size,		\
+	    CTLFLAG_RWTUN, &nm_mem.params[id].size, 0,		\
+	    "Requested size of netmap " STRINGIFY(name) "s");	\
+	SYSCTL_INT(_dev_netmap, OID_AUTO, name##_curr_size,	\
+	    CTLFLAG_RD, &nm_mem.pools[id]._objsize, 0,		\
+	    "Current size of netmap " STRINGIFY(name) "s");	\
+	SYSCTL_INT(_dev_netmap, OID_AUTO, name##_num,		\
+	    CTLFLAG_RWTUN, &nm_mem.params[id].num, 0,		\
+	    "Requested number of netmap " STRINGIFY(name) "s"); \
+	SYSCTL_INT(_dev_netmap, OID_AUTO, name##_curr_num,	\
+	    CTLFLAG_RD, &nm_mem.pools[id].objtotal, 0,		\
+	    "Current number of netmap " STRINGIFY(name) "s");	\
+	SYSCTL_INT(_dev_netmap, OID_AUTO, priv_##name##_size,	\
+	    CTLFLAG_RWTUN, &netmap_min_priv_params[id].size, 0,	\
 	    "Default size of private netmap " STRINGIFY(name) "s"); \
-	SYSCTL_INT(_dev_netmap, OID_AUTO, priv_##name##_num, \
-	    CTLFLAG_RW, &netmap_min_priv_params[id].num, 0, \
-	    "Default number of private netmap " STRINGIFY(name) "s");	\
+	SYSCTL_INT(_dev_netmap, OID_AUTO, priv_##name##_num,	\
+	    CTLFLAG_RWTUN, &netmap_min_priv_params[id].num, 0,	\
+	    "Default number of private netmap " STRINGIFY(name) "s"); \
 	SYSEND
 
 SYSCTL_DECL(_dev_netmap);