Commit fb9036dd authored by Jim Snow's avatar Jim Snow Committed by Doug Ledford

staging/hfi1: check for ARMED->ACTIVE change in recv int

The link state will transition from ARMED to ACTIVE when a non-SC15
packet arrives, but the driver might not notice the change.  With this
fix, if the slowpath receive interrupt handler sees a non-SC15 packet
while in the ARMED state, we queue work to call linkstate_active_work
from process context to promote it to ACTIVE.
Reviewed-by: default avatarDean Luick <dean.luick@intel.com>
Reviewed-by: default avatarIra Weiny <ira.weiny@intel.com>
Reviewed-by: default avatarMike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: default avatarJim Snow <jim.m.snow@intel.com>
Signed-off-by: default avatarBrendan Cunningham <brendan.cunningham@intel.com>
Signed-off-by: default avatarJubin John <jubin.john@intel.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent f4ddedf4
......@@ -7878,7 +7878,7 @@ static inline void clear_recv_intr(struct hfi1_ctxtdata *rcd)
}
/* force the receive interrupt */
static inline void force_recv_intr(struct hfi1_ctxtdata *rcd)
void force_recv_intr(struct hfi1_ctxtdata *rcd)
{
write_csr(rcd->dd, CCE_INT_FORCE + (8 * rcd->ireg), rcd->imask);
}
......@@ -7977,7 +7977,7 @@ u32 read_physical_state(struct hfi1_devdata *dd)
& DC_DC8051_STS_CUR_STATE_PORT_MASK;
}
static u32 read_logical_state(struct hfi1_devdata *dd)
u32 read_logical_state(struct hfi1_devdata *dd)
{
u64 reg;
......@@ -9952,6 +9952,7 @@ int set_link_state(struct hfi1_pportdata *ppd, u32 state)
ppd->link_enabled = 1;
}
set_all_slowpath(ppd->dd);
ret = set_local_link_attributes(ppd);
if (ret)
break;
......
......@@ -690,6 +690,8 @@ u64 read_dev_cntr(struct hfi1_devdata *dd, int index, int vl);
u64 write_dev_cntr(struct hfi1_devdata *dd, int index, int vl, u64 data);
u64 read_port_cntr(struct hfi1_pportdata *ppd, int index, int vl);
u64 write_port_cntr(struct hfi1_pportdata *ppd, int index, int vl, u64 data);
u32 read_logical_state(struct hfi1_devdata *dd);
void force_recv_intr(struct hfi1_ctxtdata *rcd);
/* Per VL indexes */
enum {
......
......@@ -862,6 +862,37 @@ static inline void set_all_dma_rtail(struct hfi1_devdata *dd)
&handle_receive_interrupt_dma_rtail;
}
void set_all_slowpath(struct hfi1_devdata *dd)
{
int i;
/* HFI1_CTRL_CTXT must always use the slow path interrupt handler */
for (i = HFI1_CTRL_CTXT + 1; i < dd->first_user_ctxt; i++)
dd->rcd[i]->do_interrupt = &handle_receive_interrupt;
}
static inline int set_armed_to_active(struct hfi1_ctxtdata *rcd,
struct hfi1_packet packet,
struct hfi1_devdata *dd)
{
struct work_struct *lsaw = &rcd->ppd->linkstate_active_work;
struct hfi1_message_header *hdr = hfi1_get_msgheader(packet.rcd->dd,
packet.rhf_addr);
if (hdr2sc(hdr, packet.rhf) != 0xf) {
int hwstate = read_logical_state(dd);
if (hwstate != LSTATE_ACTIVE) {
dd_dev_info(dd, "Unexpected link state %d\n", hwstate);
return 0;
}
queue_work(rcd->ppd->hfi1_wq, lsaw);
return 1;
}
return 0;
}
/*
* handle_receive_interrupt - receive a packet
* @rcd: the context
......@@ -929,6 +960,11 @@ int handle_receive_interrupt(struct hfi1_ctxtdata *rcd, int thread)
last = skip_rcv_packet(&packet, thread);
skip_pkt = 0;
} else {
/* Auto activate link on non-SC15 packet receive */
if (unlikely(rcd->ppd->host_link_state ==
HLS_UP_ARMED) &&
set_armed_to_active(rcd, packet, dd))
goto bail;
last = process_rcv_packet(&packet, thread);
}
......@@ -983,6 +1019,42 @@ int handle_receive_interrupt(struct hfi1_ctxtdata *rcd, int thread)
return last;
}
/*
* We may discover in the interrupt that the hardware link state has
* changed from ARMED to ACTIVE (due to the arrival of a non-SC15 packet),
* and we need to update the driver's notion of the link state. We cannot
* run set_link_state from interrupt context, so we queue this function on
* a workqueue.
*
* We delay the regular interrupt processing until after the state changes
* so that the link will be in the correct state by the time any application
* we wake up attempts to send a reply to any message it received.
* (Subsequent receive interrupts may possibly force the wakeup before we
* update the link state.)
*
* The rcd is freed in hfi1_free_ctxtdata after hfi1_postinit_cleanup invokes
* dd->f_cleanup(dd) to disable the interrupt handler and flush workqueues,
* so we're safe from use-after-free of the rcd.
*/
void receive_interrupt_work(struct work_struct *work)
{
struct hfi1_pportdata *ppd = container_of(work, struct hfi1_pportdata,
linkstate_active_work);
struct hfi1_devdata *dd = ppd->dd;
int i;
/* Received non-SC15 packet implies neighbor_normal */
ppd->neighbor_normal = 1;
set_link_state(ppd, HLS_UP_ACTIVE);
/*
* Interrupt all kernel contexts that could have had an
* interrupt during auto activation.
*/
for (i = HFI1_CTRL_CTXT; i < dd->first_user_ctxt; i++)
force_recv_intr(dd->rcd[i]);
}
/*
* Convert a given MTU size to the on-wire MAD packet enumeration.
* Return -1 if the size is invalid.
......
......@@ -729,6 +729,7 @@ struct hfi1_pportdata {
u8 remote_link_down_reason;
/* Error events that will cause a port bounce. */
u32 port_error_action;
struct work_struct linkstate_active_work;
};
typedef int (*rhf_rcv_function_ptr)(struct hfi1_packet *packet);
......@@ -1177,6 +1178,7 @@ void hfi1_free_ctxtdata(struct hfi1_devdata *, struct hfi1_ctxtdata *);
int handle_receive_interrupt(struct hfi1_ctxtdata *, int);
int handle_receive_interrupt_nodma_rtail(struct hfi1_ctxtdata *, int);
int handle_receive_interrupt_dma_rtail(struct hfi1_ctxtdata *, int);
void set_all_slowpath(struct hfi1_devdata *dd);
/* receive packet handler dispositions */
#define RCV_PKT_OK 0x0 /* keep going */
......@@ -1197,6 +1199,15 @@ static inline u32 driver_lstate(struct hfi1_pportdata *ppd)
return ppd->lstate; /* use the cached value */
}
void receive_interrupt_work(struct work_struct *work);
/* extract service channel from header and rhf */
static inline int hdr2sc(struct hfi1_message_header *hdr, u64 rhf)
{
return ((be16_to_cpu(hdr->lrh[0]) >> 12) & 0xf) |
((!!(rhf & RHF_DC_INFO_MASK)) << 4);
}
static inline u16 generate_jkey(kuid_t uid)
{
return from_kuid(current_user_ns(), uid) & 0xffff;
......
......@@ -498,6 +498,7 @@ void hfi1_init_pportdata(struct pci_dev *pdev, struct hfi1_pportdata *ppd,
INIT_WORK(&ppd->link_downgrade_work, handle_link_downgrade);
INIT_WORK(&ppd->sma_message_work, handle_sma_message);
INIT_WORK(&ppd->link_bounce_work, handle_link_bounce);
INIT_WORK(&ppd->linkstate_active_work, receive_interrupt_work);
mutex_init(&ppd->hls_lock);
spin_lock_init(&ppd->sdma_alllock);
spin_lock_init(&ppd->qsfp_info.qsfp_lock);
......
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