IB/hfi1: TID RDMA flow allocation
The hfi1 hardware flow is a hardware flow-control mechanism for a KDETH
data packet that is received on a hfi1 port. It validates the packet by
checking both the generation and sequence. Each QP that uses the TID RDMA
mechanism will allocate a hardware flow from its receiving context for
any incoming KDETH data packets.
This patch implements:
(1) a function to allocate hardware flow
(2) a function to free hardware flow
(3) a function to initialize hardware flow generation for a receiving
context
(4) a wait mechanism if the hardware flow is not available
(4) a function to remove the qp from the wait queue for hardware flow
when the qp is reset or destroyed.
Signed-off-by: Mitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/drivers/infiniband/hw/hfi1/hfi.h b/drivers/infiniband/hw/hfi1/hfi.h
index 9aa0357..78aa344 100644
--- a/drivers/infiniband/hw/hfi1/hfi.h
+++ b/drivers/infiniband/hw/hfi1/hfi.h
@@ -198,6 +198,14 @@ struct exp_tid_set {
};
typedef int (*rhf_rcv_function_ptr)(struct hfi1_packet *packet);
+
+struct tid_queue {
+ struct list_head queue_head;
+ /* queue head for QP TID resource waiters */
+ u32 enqueue; /* count of tid enqueues */
+ u32 dequeue; /* count of tid dequeues */
+};
+
struct hfi1_ctxtdata {
/* rcvhdrq base, needs mmap before useful */
void *rcvhdrq;
@@ -291,6 +299,10 @@ struct hfi1_ctxtdata {
/* PSM Specific fields */
/* lock protecting all Expected TID data */
struct mutex exp_mutex;
+ /* lock protecting all Expected TID data of kernel contexts */
+ spinlock_t exp_lock;
+ /* Queue for QP's waiting for HW TID flows */
+ struct tid_queue flow_queue;
/* when waiting for rcv or pioavail */
wait_queue_head_t wait;
/* uuid from PSM */
@@ -323,6 +335,9 @@ struct hfi1_ctxtdata {
*/
u8 subctxt_cnt;
+ /* Bit mask to track free TID RDMA HW flows */
+ unsigned long flow_mask;
+ struct tid_flow_state flows[RXE_NUM_TID_FLOWS];
};
/**