octeontx2-af: Mbox communication support btw AF and it's VFs

VFs attached to PFs other than AF can not communicate with AF
directly. Instead they are supposed to first send message to
the PF they are residing on and PF forwards it to the AF.
Responses to messages are handled in the reverse order.

On the other hand if VFs are on AF (PF0) itself then direct mailbox
communication is possible since there's no other PF in the way.

This patch addresses this particular case and adds support for
handling it.
Signed-off-by: Tomasz Duszynski <tduszynski@marvell.com>
Signed-off-by: Marko Kallio <mkallio@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/octeontx2/af/rvu.h

@@ -183,6 +183,16 @@ struct rvu_hwinfo {
 	struct npc_mcam  mcam;
 };
 
+struct mbox_wq_info {
+	struct otx2_mbox mbox;
+	struct rvu_work *mbox_wrk;
+
+	struct otx2_mbox mbox_up;
+	struct rvu_work *mbox_wrk_up;
+
+	struct workqueue_struct *mbox_wq;
+};
+
 struct rvu {
 	void __iomem		*afreg_base;
 	void __iomem		*pfreg_base;
@@ -194,11 +204,8 @@ struct rvu {
 	struct mutex            rsrc_lock; /* Serialize resource alloc/free */
 
 	/* Mbox */
-	struct otx2_mbox	mbox;
-	struct rvu_work		*mbox_wrk;
-	struct otx2_mbox        mbox_up;
-	struct rvu_work		*mbox_wrk_up;
-	struct workqueue_struct *mbox_wq;
+	struct mbox_wq_info	afpf_wq_info;
+	struct mbox_wq_info	afvf_wq_info;
 
 	/* PF FLR */
 	struct rvu_work		*flr_wrk;

drivers/net/ethernet/marvell/octeontx2/af/rvu_cgx.c

@@ -27,7 +27,7 @@ static struct _req_type __maybe_unused					\
 	struct _req_type *req;						\
 									\
 	req = (struct _req_type *)otx2_mbox_alloc_msg_rsp(		\
-		&rvu->mbox_up, devid, sizeof(struct _req_type),		\
+		&rvu->afpf_wq_info.mbox_up, devid, sizeof(struct _req_type), \
 		sizeof(struct _rsp_type));				\
 	if (!req)							\
 		return NULL;						\
@@ -181,8 +181,8 @@ static void cgx_notify_pfs(struct cgx_link_event *event, struct rvu *rvu)
 		if (!msg)
 			continue;
 		msg->link_info = *linfo;
-		otx2_mbox_msg_send(&rvu->mbox_up, pfid);
-		err = otx2_mbox_wait_for_rsp(&rvu->mbox_up, pfid);
+		otx2_mbox_msg_send(&rvu->afpf_wq_info.mbox_up, pfid);
+		err = otx2_mbox_wait_for_rsp(&rvu->afpf_wq_info.mbox_up, pfid);
 		if (err)
 			dev_warn(rvu->dev, "notification to pf %d failed\n",
 				 pfid);