bnxt: Fix build / load error for bnxt(4) in kernels without PCI_IOV

This change removes the hard-forcing of  PCI_IOV and adds shims to
allow the driver to compile and work when the kernel is missing
PCI_IOV support.

Fixes: 7c450d1127
Reviewed by: sumit.saxena_broadcom.com
Differential Revision: https://reviews.freebsd.org/D57300
Sponsored by: Netflix

sys/dev/bnxt/bnxt_en/bnxt_sriov.c

@@ -7,6 +7,8 @@
 #include "bnxt_hwrm.h"
 #include "bnxt_sriov.h"
 
+#ifdef PCI_IOV
+
 static int
 bnxt_set_vf_admin_mac(struct bnxt_softc *softc, struct bnxt_vf_info *vf,
 		      const uint8_t *mac)
@@ -973,6 +975,43 @@ void bnxt_sriov_attach(struct bnxt_softc *softc)
 		device_printf(dev, "Failed to initialize SR-IOV (error=%d)\n", rc);
 }
 
+#else
+
+void
+bnxt_sriov_attach(struct bnxt_softc *softc __unused)
+{
+}
+
+int
+bnxt_cfg_hw_sriov(struct bnxt_softc *softc __unused,
+    uint16_t *num_vfs __unused, bool reset __unused)
+{
+	return (0);
+}
+
+int
+bnxt_approve_mac(struct bnxt_softc *sc __unused)
+{
+	return (0);
+}
+
+void
+bnxt_hwrm_exec_fwd_req(struct bnxt_softc *softc __unused)
+{
+}
+
+bool
+bnxt_promisc_ok(struct bnxt_softc *softc __unused)
+{
+	return (true);
+}
+
+void
+bnxt_update_vf_mac(struct bnxt_softc *sc __unused)
+{
+}
+#endif
+
 void bnxt_reenable_sriov(struct bnxt_softc *bp)
 {
 	if (BNXT_PF(bp)) {

sys/dev/bnxt/bnxt_en/bnxt_sriov.h

@@ -8,10 +8,6 @@
 #include "opt_global.h"
 #include "bnxt.h"
 
-#ifndef PCI_IOV
-#define PCI_IOV 1
-#endif
-
 /* macro definations */
 
 #define BNXT_MAX_VFS 4

sys/dev/bnxt/bnxt_en/if_bnxt.c

@@ -2875,11 +2875,9 @@ bnxt_attach_post(if_ctx_t ctx)
 	bnxt_dcb_init(softc);
 	bnxt_rdma_aux_device_init(softc);
 
-#if PCI_IOV
 	/* SR-IOV attach */
 	if (BNXT_PF(softc) && BNXT_CHIP_P5_PLUS(softc))
 		bnxt_sriov_attach(softc);
-#endif
 
 failed:
 	return rc;