Add more functions to the Linux kernel compatibility layer. Add some

missing includes which are needed when the header files are not
included in a particular order.

MFC after:	1 month
Sponsored by:	Mellanox Technologies

sys/ofed/include/linux/gfp.h

@@ -105,6 +105,13 @@ __free_pages(struct page *m, unsigned int order)
 	kmem_free(kmem_arena, (vm_offset_t)page_address(m), size);
 }
 
+static inline void free_pages(uintptr_t addr, unsigned int order)
+{
+	if (addr == 0)
+		return;
+	__free_pages(virt_to_page((void *)addr), order);
+}
+
 /*
  * Alloc pages allocates directly from the buddy allocator on linux so
  * order specifies a power of two bucket of pages and the results
@@ -124,6 +131,16 @@ alloc_pages(gfp_t gfp_mask, unsigned int order)
         return (virt_to_page(page));
 }
 
+static inline uintptr_t __get_free_pages(gfp_t gfp_mask, unsigned int order)
+{
+	struct page *page;
+
+	page = alloc_pages(gfp_mask, order);
+	if (page == NULL)
+		return (0);
+	return ((uintptr_t)page_address(page));
+}
+
 #define alloc_pages_node(node, mask, order)     alloc_pages(mask, order)
 
 #define kmalloc_node(chunk, mask, node)         kmalloc(chunk, mask)

sys/ofed/include/linux/kernel.h

@@ -68,6 +68,7 @@
 #undef	ALIGN
 #define	ALIGN(x, y)		roundup2((x), (y))
 #define	DIV_ROUND_UP		howmany
+#define	FIELD_SIZEOF(t, f)	sizeof(((t *)0)->f)
 
 #define	printk(X...)		printf(X)
 
@@ -175,6 +176,7 @@
 #define round_down(x, y) ((x) & ~__round_mask(x, y))
 
 #define	num_possible_cpus()	mp_ncpus
+#define	num_online_cpus()	mp_ncpus
 
 typedef struct pm_message {
         int event;

sys/ofed/include/linux/kref.h

@@ -29,6 +29,7 @@
 #ifndef _LINUX_KREF_H_
 #define _LINUX_KREF_H_
 
+#include <sys/types.h>
 #include <sys/refcount.h>
 
 struct kref {

sys/ofed/include/linux/pci.h

@@ -269,6 +269,14 @@ pci_set_master(struct pci_dev *pdev)
 	return (0);
 }
 
+static inline int
+pci_clear_master(struct pci_dev *pdev)
+{
+
+	pci_disable_busmaster(pdev->dev.bsddev);
+	return (0);
+}
+
 static inline int
 pci_request_region(struct pci_dev *pdev, int bar, const char *res_name)
 {
@@ -458,6 +466,30 @@ pci_enable_msix(struct pci_dev *pdev, struct msix_entry *entries, int nreq)
 	return (0);
 }
 
+#define	pci_enable_msix_range	linux_pci_enable_msix_range
+static inline int
+pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
+    int minvec, int maxvec)
+{
+	int nvec = maxvec;
+	int rc;
+
+	if (maxvec < minvec)
+		return (-ERANGE);
+
+	do {
+		rc = pci_enable_msix(dev, entries, nvec);
+		if (rc < 0) {
+			return (rc);
+		} else if (rc > 0) {
+			if (rc < minvec)
+				return (-ENOSPC);
+			nvec = rc;
+		}
+	} while (rc);
+	return (nvec);
+}
+
 static inline int pci_channel_offline(struct pci_dev *pdev)
 {
         return false;