system/freebsd-src
system/freebsd-src
1
0
Fork 0
mirror of https://github.com/freebsd/freebsd-src synced 2024-10-04 15:40:44 +00:00
Code Issues Packages Projects Releases Wiki Activity

cxgbe(4): New knob to limit driver to the specified types of doorbells.

Browse source 
hw.cxgbe.doorbells_allowed="0xf"

The adapter's doorbells bitmap is clipped to the value specified in the
tunable, which is meant for debug and workarounds only.  There is no
change in default behavior.

MFC after:	1 week
Sponsored by:	Chelsio Communications
This commit is contained in:
Navdeep Parhar 2024-06-13 10:22:03 -07:00
parent d72db09005
commit ba95b4aea7
3 changed files with 26 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
sys/dev/cxgbe/adapter.h
View file

@ -1364,6 +1364,7 @@ void t4_add_adapter(struct adapter *);
int t4_detach_common(device_t);
int t4_map_bars_0_and_4(struct adapter *);
int t4_map_bar_2(struct adapter *);
int t4_adj_doorbells(struct adapter *);
int t4_setup_intr_handlers(struct adapter *);
void t4_sysctls(struct adapter *);
int begin_synchronized_op(struct adapter *, struct vi_info *, int, char *);

21
sys/dev/cxgbe/t4_main.c
View file

@ -604,6 +604,11 @@ static int t5_write_combine = 0;
SYSCTL_INT(_hw_cxl, OID_AUTO, write_combine, CTLFLAG_RDTUN, &t5_write_combine,
0, "Use WC instead of UC for BAR2");
/* From t4_sysctls: doorbells = {"\20\1UDB\2WCWR\3UDBWC\4KDB"} */
static int t4_doorbells_allowed = 0xf;
SYSCTL_INT(_hw_cxgbe, OID_AUTO, doorbells_allowed, CTLFLAG_RDTUN,
&t4_doorbells_allowed, 0, "Limit tx queues to these doorbells");
static int t4_num_vis = 1;
SYSCTL_INT(_hw_cxgbe, OID_AUTO, num_vis, CTLFLAG_RDTUN, &t4_num_vis, 0,
"Number of VIs per port");
@ -1347,6 +1352,10 @@ t4_attach(device_t dev)
if (rc != 0)
goto done; /* error message displayed already */
rc = t4_adj_doorbells(sc);
if (rc != 0)
goto done; /* error message displayed already */
rc = t4_create_dma_tag(sc);
if (rc != 0)
goto done; /* error message displayed already */
@ -3760,6 +3769,18 @@ t4_map_bar_2(struct adapter *sc)
return (0);
}
int
t4_adj_doorbells(struct adapter *sc)
{
if ((sc->doorbells & t4_doorbells_allowed) != 0) {
sc->doorbells &= t4_doorbells_allowed;
return (0);
}
CH_ERR(sc, "No usable doorbell (available = 0x%x, allowed = 0x%x).\n",
sc->doorbells, t4_doorbells_allowed);
return (EINVAL);
}
struct memwin_init {
uint32_t base;
uint32_t aperture;

4
sys/dev/cxgbe/t4_vf.c
View file

@ -589,6 +589,10 @@ t4vf_attach(device_t dev)
if (rc != 0)
goto done; /* error message displayed already */
rc = t4_adj_doorbells(sc);
if (rc != 0)
goto done; /* error message displayed already */
rc = t4_create_dma_tag(sc);
if (rc != 0)
goto done; /* error message displayed already */