IB/hfi1: Virtual Network Interface Controller (VNIC) HW support

HFI1 HW specific support for VNIC functionality.
Dynamically allocate a set of contexts for VNIC when the first vnic
port is instantiated. Allocate VNIC contexts from user contexts pool
and return them back to the same pool while freeing up. Set aside
enough MSI-X interrupts for VNIC contexts and assign them when the
contexts are allocated. On the receive side, use an RSM rule to
spread TCP/UDP streams among VNIC contexts.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Andrzej Kacprowski <andrzej.kacprowski@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 18 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/hfi1/pio.c b/drivers/infiniband/hw/hfi1/pio.c
index 615be68e40b3..ed72b5aca139 100644
--- a/drivers/infiniband/hw/hfi1/pio.c
+++ b/drivers/infiniband/hw/hfi1/pio.c
@@ -1,5 +1,5 @@
 /*
- * Copyright(c) 2015, 2016 Intel Corporation.
+ * Copyright(c) 2015-2017 Intel Corporation.
  *
  * This file is provided under a dual BSD/GPLv2 license.  When using or
  * redistributing this file, you may do so under either license.
@@ -703,6 +703,7 @@ struct send_context *sc_alloc(struct hfi1_devdata *dd, int type,
 {
 	struct send_context_info *sci;
 	struct send_context *sc = NULL;
+	int req_type = type;
 	dma_addr_t dma;
 	unsigned long flags;
 	u64 reg;
@@ -729,6 +730,13 @@ struct send_context *sc_alloc(struct hfi1_devdata *dd, int type,
 		return NULL;
 	}
 
+	/*
+	 * VNIC contexts are dynamically allocated.
+	 * Hence, pick a user context for VNIC.
+	 */
+	if (type == SC_VNIC)
+		type = SC_USER;
+
 	spin_lock_irqsave(&dd->sc_lock, flags);
 	ret = sc_hw_alloc(dd, type, &sw_index, &hw_context);
 	if (ret) {
@@ -738,6 +746,15 @@ struct send_context *sc_alloc(struct hfi1_devdata *dd, int type,
 		return NULL;
 	}
 
+	/*
+	 * VNIC contexts are used by kernel driver.
+	 * Hence, mark them as kernel contexts.
+	 */
+	if (req_type == SC_VNIC) {
+		dd->send_contexts[sw_index].type = SC_KERNEL;
+		type = SC_KERNEL;
+	}
+
 	sci = &dd->send_contexts[sw_index];
 	sci->sc = sc;