octeontx2-af: Teardown NPA, NIX LF upon receiving FLR

Upon receiving FLR IRQ for a RVU PF, teardown or cleanup
resources held by that PF_FUNC. This patch cleans up,
NIX LF
 - Stop ingress/egress traffic
 - Disable NPC MCAM entries being used.
 - Free Tx scheduler queues
 - Disable RQ/SQ/CQ HW contexts
NPA LF
 - Disable Pool/Aura HW contexts
In future teardown of SSO/SSOW/TIM/CPT will be added.

Also added a mailbox message for a RVU PF to request
AF, to perform FLR for a RVU VF under it.
Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Signed-off-by: Stanislaw Kardach <skardach@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/mbox.h

@@ -124,6 +124,7 @@ M(READY,		0x001, ready, msg_req, ready_msg_rsp)		\
 M(ATTACH_RESOURCES,	0x002, attach_resources, rsrc_attach, msg_rsp)	\
 M(DETACH_RESOURCES,	0x003, detach_resources, rsrc_detach, msg_rsp)	\
 M(MSIX_OFFSET,		0x004, msix_offset, msg_req, msix_offset_rsp)	\
+M(VF_FLR,		0x006, vf_flr, msg_req, msg_rsp)		\
 /* CGX mbox IDs (range 0x200 - 0x3FF) */				\
 M(CGX_START_RXTX,	0x200, cgx_start_rxtx, msg_req, msg_rsp)	\
 M(CGX_STOP_RXTX,	0x201, cgx_stop_rxtx, msg_req, msg_rsp)		\
@@ -229,6 +230,13 @@ struct msg_rsp {
 	struct mbox_msghdr hdr;
 };
 
+/* RVU mailbox error codes
+ * Range 256 - 300.
+ */
+enum rvu_af_status {
+	RVU_INVALID_VF_ID           = -256,
+};
+
 struct ready_msg_rsp {
 	struct mbox_msghdr hdr;
 	u16    sclk_feq;	/* SCLK frequency */

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

@@ -29,6 +29,7 @@ static void rvu_set_msix_offset(struct rvu *rvu, struct rvu_pfvf *pfvf,
 				struct rvu_block *block, int lf);
 static void rvu_clear_msix_offset(struct rvu *rvu, struct rvu_pfvf *pfvf,
 				  struct rvu_block *block, int lf);
+static void __rvu_flr_handler(struct rvu *rvu, u16 pcifunc);
 
 /* Supported devices */
 static const struct pci_device_id rvu_id_table[] = {
@@ -1320,6 +1321,26 @@ static int rvu_mbox_handler_msix_offset(struct rvu *rvu, struct msg_req *req,
 	return 0;
 }
 
+static int rvu_mbox_handler_vf_flr(struct rvu *rvu, struct msg_req *req,
+				   struct msg_rsp *rsp)
+{
+	u16 pcifunc = req->hdr.pcifunc;
+	u16 vf, numvfs;
+	u64 cfg;
+
+	vf = pcifunc & RVU_PFVF_FUNC_MASK;
+	cfg = rvu_read64(rvu, BLKADDR_RVUM,
+			 RVU_PRIV_PFX_CFG(rvu_get_pf(pcifunc)));
+	numvfs = (cfg >> 12) & 0xFF;
+
+	if (vf && vf <= numvfs)
+		__rvu_flr_handler(rvu, pcifunc);
+	else
+		return RVU_INVALID_VF_ID;
+
+	return 0;
+}
+
 static int rvu_process_mbox_msg(struct rvu *rvu, int devid,
 				struct mbox_msghdr *req)
 {
@@ -1601,14 +1622,73 @@ static void rvu_enable_mbox_intr(struct rvu *rvu)
 		    INTR_MASK(hw->total_pfs) & ~1ULL);
 }
 
+static void rvu_blklf_teardown(struct rvu *rvu, u16 pcifunc, u8 blkaddr)
+{
+	struct rvu_block *block;
+	int slot, lf, num_lfs;
+	int err;
+
+	block = &rvu->hw->block[blkaddr];
+	num_lfs = rvu_get_rsrc_mapcount(rvu_get_pfvf(rvu, pcifunc),
+					block->type);
+	if (!num_lfs)
+		return;
+	for (slot = 0; slot < num_lfs; slot++) {
+		lf = rvu_get_lf(rvu, block, pcifunc, slot);
+		if (lf < 0)
+			continue;
+
+		/* Cleanup LF and reset it */
+		if (block->addr == BLKADDR_NIX0)
+			rvu_nix_lf_teardown(rvu, pcifunc, block->addr, lf);
+		else if (block->addr == BLKADDR_NPA)
+			rvu_npa_lf_teardown(rvu, pcifunc, lf);
+
+		err = rvu_lf_reset(rvu, block, lf);
+		if (err) {
+			dev_err(rvu->dev, "Failed to reset blkaddr %d LF%d\n",
+				block->addr, lf);
+		}
+	}
+}
+
+static void __rvu_flr_handler(struct rvu *rvu, u16 pcifunc)
+{
+	mutex_lock(&rvu->flr_lock);
+	/* Reset order should reflect inter-block dependencies:
+	 * 1. Reset any packet/work sources (NIX, CPT, TIM)
+	 * 2. Flush and reset SSO/SSOW
+	 * 3. Cleanup pools (NPA)
+	 */
+	rvu_blklf_teardown(rvu, pcifunc, BLKADDR_NIX0);
+	rvu_blklf_teardown(rvu, pcifunc, BLKADDR_CPT0);
+	rvu_blklf_teardown(rvu, pcifunc, BLKADDR_TIM);
+	rvu_blklf_teardown(rvu, pcifunc, BLKADDR_SSOW);
+	rvu_blklf_teardown(rvu, pcifunc, BLKADDR_SSO);
+	rvu_blklf_teardown(rvu, pcifunc, BLKADDR_NPA);
+	rvu_detach_rsrcs(rvu, NULL, pcifunc);
+	mutex_unlock(&rvu->flr_lock);
+}
+
 static void rvu_flr_handler(struct work_struct *work)
 {
 	struct rvu_work *flrwork = container_of(work, struct rvu_work, work);
 	struct rvu *rvu = flrwork->rvu;
-	u16 pf;
+	u16 pcifunc, numvfs, vf;
+	u64 cfg;
+	int pf;
 
 	pf = flrwork - rvu->flr_wrk;
 
+	cfg = rvu_read64(rvu, BLKADDR_RVUM, RVU_PRIV_PFX_CFG(pf));
+	numvfs = (cfg >> 12) & 0xFF;
+	pcifunc  = pf << RVU_PFVF_PF_SHIFT;
+
+	for (vf = 0; vf < numvfs; vf++)
+		__rvu_flr_handler(rvu, (pcifunc | (vf + 1)));
+
+	__rvu_flr_handler(rvu, pcifunc);
+
 	/* Signal FLR finish */
 	rvu_write64(rvu, BLKADDR_RVUM, RVU_AF_PFTRPEND, BIT_ULL(pf));
 

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

@@ -325,6 +325,7 @@ int rvu_mbox_handler_cgx_intlbk_disable(struct rvu *rvu, struct msg_req *req,
 /* NPA APIs */
 int rvu_npa_init(struct rvu *rvu);
 void rvu_npa_freemem(struct rvu *rvu);
+void rvu_npa_lf_teardown(struct rvu *rvu, u16 pcifunc, int npalf);
 int rvu_mbox_handler_npa_aq_enq(struct rvu *rvu,
 				struct npa_aq_enq_req *req,
 				struct npa_aq_enq_rsp *rsp);
@@ -342,6 +343,7 @@ bool is_nixlf_attached(struct rvu *rvu, u16 pcifunc);
 int rvu_nix_init(struct rvu *rvu);
 void rvu_nix_freemem(struct rvu *rvu);
 int rvu_get_nixlf_count(struct rvu *rvu);
+void rvu_nix_lf_teardown(struct rvu *rvu, u16 pcifunc, int blkaddr, int npalf);
 int rvu_mbox_handler_nix_lf_alloc(struct rvu *rvu,
 				  struct nix_lf_alloc_req *req,
 				  struct nix_lf_alloc_rsp *rsp);

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

@@ -105,6 +105,17 @@ static inline struct nix_hw *get_nix_hw(struct rvu_hwinfo *hw, int blkaddr)
 	return NULL;
 }
 
+static void nix_rx_sync(struct rvu *rvu, int blkaddr)
+{
+	int err;
+
+	/*Sync all in flight RX packets to LLC/DRAM */
+	rvu_write64(rvu, blkaddr, NIX_AF_RX_SW_SYNC, BIT_ULL(0));
+	err = rvu_poll_reg(rvu, blkaddr, NIX_AF_RX_SW_SYNC, BIT_ULL(0), true);
+	if (err)
+		dev_err(rvu->dev, "NIX RX software sync failed\n");
+}
+
 static bool is_valid_txschq(struct rvu *rvu, int blkaddr,
 			    int lvl, u16 pcifunc, u16 schq)
 {
@@ -2281,3 +2292,40 @@ int rvu_mbox_handler_nix_lf_stop_rx(struct rvu *rvu, struct msg_req *req,
 	rvu_npc_disable_default_entries(rvu, pcifunc, nixlf);
 	return 0;
 }
+
+void rvu_nix_lf_teardown(struct rvu *rvu, u16 pcifunc, int blkaddr, int nixlf)
+{
+	struct rvu_pfvf *pfvf = rvu_get_pfvf(rvu, pcifunc);
+	struct hwctx_disable_req ctx_req;
+	int err;
+
+	ctx_req.hdr.pcifunc = pcifunc;
+
+	/* Cleanup NPC MCAM entries, free Tx scheduler queues being used */
+	nix_interface_deinit(rvu, pcifunc, nixlf);
+	nix_rx_sync(rvu, blkaddr);
+	nix_txschq_free(rvu, pcifunc);
+
+	if (pfvf->sq_ctx) {
+		ctx_req.ctype = NIX_AQ_CTYPE_SQ;
+		err = nix_lf_hwctx_disable(rvu, &ctx_req);
+		if (err)
+			dev_err(rvu->dev, "SQ ctx disable failed\n");
+	}
+
+	if (pfvf->rq_ctx) {
+		ctx_req.ctype = NIX_AQ_CTYPE_RQ;
+		err = nix_lf_hwctx_disable(rvu, &ctx_req);
+		if (err)
+			dev_err(rvu->dev, "RQ ctx disable failed\n");
+	}
+
+	if (pfvf->cq_ctx) {
+		ctx_req.ctype = NIX_AQ_CTYPE_CQ;
+		err = nix_lf_hwctx_disable(rvu, &ctx_req);
+		if (err)
+			dev_err(rvu->dev, "CQ ctx disable failed\n");
+	}
+
+	nix_ctx_free(rvu, pfvf);
+}

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

@@ -470,3 +470,20 @@ void rvu_npa_freemem(struct rvu *rvu)
 	block = &hw->block[blkaddr];
 	rvu_aq_free(rvu, block->aq);
 }
+
+void rvu_npa_lf_teardown(struct rvu *rvu, u16 pcifunc, int npalf)
+{
+	struct rvu_pfvf *pfvf = rvu_get_pfvf(rvu, pcifunc);
+	struct hwctx_disable_req ctx_req;
+
+	/* Disable all pools */
+	ctx_req.hdr.pcifunc = pcifunc;
+	ctx_req.ctype = NPA_AQ_CTYPE_POOL;
+	npa_lf_hwctx_disable(rvu, &ctx_req);
+
+	/* Disable all auras */
+	ctx_req.ctype = NPA_AQ_CTYPE_AURA;
+	npa_lf_hwctx_disable(rvu, &ctx_req);
+
+	npa_ctx_free(rvu, pfvf);
+}