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Make BPF global lock an SX

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This allows NIC drivers to sleep on polling config operations.

Submitted by:	Matthew Macy <mmacy@mattmacy.io>
Reviewed by:	shurd
Sponsored by:	Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D14982
This commit is contained in:
Stephen Hurd 2018-04-10 19:42:50 +00:00
parent 74d6c131cb
commit f422673e10
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=332388
3 changed files with 6 additions and 6 deletions
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2
sys/kern/subr_witness.c
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@ -569,7 +569,7 @@ static struct witness_order_list_entry order_lists[] = {
/*
* BPF
*/
{ "bpf global lock", &lock_class_mtx_sleep },
{ "bpf global lock", &lock_class_sx },
{ "bpf interface lock", &lock_class_rw },
{ "bpf cdev lock", &lock_class_mtx_sleep },
{ NULL, NULL },

7
sys/net/bpf.c
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@ -159,6 +159,9 @@ struct bpf_dltlist32 {
#define BIOCSETFNR32 _IOW('B', 130, struct bpf_program32)
#endif
#define BPF_LOCK() sx_xlock(&bpf_sx)
#define BPF_UNLOCK() sx_xunlock(&bpf_sx)
#define BPF_LOCK_ASSERT() sx_assert(&bpf_sx, SA_XLOCKED)
/*
* bpf_iflist is a list of BPF interface structures, each corresponding to a
* specific DLT. The same network interface might have several BPF interface
@ -166,7 +169,7 @@ struct bpf_dltlist32 {
* frames, ethernet frames, etc).
*/
static LIST_HEAD(, bpf_if) bpf_iflist, bpf_freelist;
static struct mtx bpf_mtx; /* bpf global lock */
static struct sx bpf_sx; /* bpf global lock */
static int bpf_bpfd_cnt;
static void bpf_attachd(struct bpf_d *, struct bpf_if *);
@ -2821,7 +2824,7 @@ bpf_drvinit(void *unused)
{
struct cdev *dev;
mtx_init(&bpf_mtx, "bpf global lock", NULL, MTX_DEF);
sx_init(&bpf_sx, "bpf global lock");
LIST_INIT(&bpf_iflist);
LIST_INIT(&bpf_freelist);

3
sys/net/bpfdesc.h
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@ -118,9 +118,6 @@ struct bpf_d {
#define BPF_PID_REFRESH(bd, td) (bd)->bd_pid = (td)->td_proc->p_pid
#define BPF_PID_REFRESH_CUR(bd) (bd)->bd_pid = curthread->td_proc->p_pid
#define BPF_LOCK() mtx_lock(&bpf_mtx)
#define BPF_UNLOCK() mtx_unlock(&bpf_mtx)
#define BPF_LOCK_ASSERT() mtx_assert(&bpf_mtx, MA_OWNED)
/*
* External representation of the bpf descriptor
*/