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netmap: make sure rings are disabled during resets

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Explicitly disable ring synchronization before calling
callbacks that may result in a hardware reset.

Before this patch we relied on capturing the down/up events which,
however, may not be issued by all drivers.
This commit is contained in:
Vincenzo Maffione 2021-04-17 14:01:20 +00:00
parent d1de2b05a0
commit 13c4641188
2 changed files with 30 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
sys/dev/netmap/netmap.c
View File

@ -1002,6 +1002,22 @@ netmap_mem_drop(struct netmap_adapter *na)
}
}
static void
netmap_update_hostrings_mode(struct netmap_adapter *na)
{
enum txrx t;
struct netmap_kring *kring;
int i;
for_rx_tx(t) {
for (i = nma_get_nrings(na, t);
i < netmap_real_rings(na, t); i++) {
kring = NMR(na, t)[i];
kring->nr_mode = kring->nr_pending_mode;
}
}
}
/*
* Undo everything that was done in netmap_do_regif(). In particular,
* call nm_register(ifp,0) to stop netmap mode on the interface and
@ -1031,8 +1047,12 @@ netmap_do_unregif(struct netmap_priv_d *priv)
}
#endif
netmap_update_hostrings_mode(na);
if (na->active_fds <= 0 || nm_kring_pending(priv)) {
netmap_set_all_rings(na, NM_KR_LOCKED);
na->nm_register(na, 0);
netmap_set_all_rings(na, 0);
}
/* delete rings and buffers that are no longer needed */
@ -2609,10 +2629,17 @@ netmap_do_regif(struct netmap_priv_d *priv, struct netmap_adapter *na,
goto err_rel_excl;
}
/* make sure we don't call na->nm_register() when only
* host rings are changing mode
*/
netmap_update_hostrings_mode(na);
if (nm_kring_pending(priv)) {
/* Some kring is switching mode, tell the adapter to
* react on this. */
netmap_set_all_rings(na, NM_KR_LOCKED);
error = na->nm_register(na, 1);
netmap_set_all_rings(na, 0);
if (error)
goto err_del_if;
}
@ -2634,6 +2661,7 @@ netmap_do_regif(struct netmap_priv_d *priv, struct netmap_adapter *na,
netmap_mem_if_delete(na, nifp);
err_rel_excl:
netmap_krings_put(priv);
netmap_update_hostrings_mode(na);
netmap_mem_rings_delete(na);
err_del_krings:
if (na->active_fds == 0)
@ -2840,6 +2868,8 @@ netmap_ioctl(struct netmap_priv_d *priv, u_long cmd, caddr_t data,
&nifp->ni_bufs_head, req->nr_extra_bufs);
if (netmap_verbose)
nm_prinf("got %d extra buffers", req->nr_extra_bufs);
} else {
nifp->ni_bufs_head = 0;
}
req->nr_offset = netmap_mem_if_offset(na->nm_mem, nifp);
@ -4473,7 +4503,6 @@ nm_set_native_flags(struct netmap_adapter *na)
na->na_flags |= NAF_NETMAP_ON;
nm_os_onenter(ifp);
nm_update_hostrings_mode(na);
}
void
@ -4487,7 +4516,6 @@ nm_clear_native_flags(struct netmap_adapter *na)
return;
}
nm_update_hostrings_mode(na);
nm_os_onexit(ifp);
na->na_flags &= ~NAF_NETMAP_ON;

10
sys/dev/netmap/netmap_kern.h
View File

@ -1435,16 +1435,6 @@ nm_iszombie(struct netmap_adapter *na)
return na == NULL || (na->na_flags & NAF_ZOMBIE);
}
static inline void
nm_update_hostrings_mode(struct netmap_adapter *na)
{
/* Process nr_mode and nr_pending_mode for host rings. */
na->tx_rings[na->num_tx_rings]->nr_mode =
na->tx_rings[na->num_tx_rings]->nr_pending_mode;
na->rx_rings[na->num_rx_rings]->nr_mode =
na->rx_rings[na->num_rx_rings]->nr_pending_mode;
}
void nm_set_native_flags(struct netmap_adapter *);
void nm_clear_native_flags(struct netmap_adapter *);