Handle support of PCI FLR capability (#517)

* Handle support of PCI FLR capability

If device supports FLR cap then call vfu_reset_cb_t when FLR is
initiated by client.

Signed-off-by: Swapnil Ingle <swapnil.ingle@nutanix.com>
Reviewed-by: John Levon <john.levon@nutanix.com>
Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>

1 files changed, 10 insertions, 2 deletions

diff --git a/lib/pci_caps.c b/lib/pci_caps.c
index 550d373..b00b9b8 100644
--- a/lib/pci_caps.c
+++ b/lib/pci_caps.c
@@ -277,8 +277,16 @@ handle_px_pxdc_write(vfu_ctx_t *vfu_ctx, struct pxcap *px,
     }
 
     if (p->iflr) {
-        vfu_log(vfu_ctx, LOG_DEBUG,
-            "initiate function level reset");
+        if (px->pxdcap.flrc == 0) {
+            vfu_log(vfu_ctx, LOG_ERR, "FLR capability is not supported");
+            return ERROR_INT(EINVAL);
+        }
+        if (vfu_ctx->reset != NULL) {
+            vfu_log(vfu_ctx, LOG_DEBUG, "initiate function level reset");
+            return vfu_ctx->reset(vfu_ctx, VFU_RESET_PCI_FLR);
+        } else {
+            vfu_log(vfu_ctx, LOG_ERR, "FLR callback is not implemented");
+        }
     }
 
     return 0;