octeontx2-af: Broadcast packet replication support

Allocate memory for mcast/bcast/mirror replication entry
contexts, replication buffers (used by HW) and config HW
with corresponding memory bases. Added support for installing
MCEs via NIX AQ mbox.

For now support is restricted to broadcast pkt replication,
hence MCE table size and number of replication buffers
allocated are less. Each CGX LMAC mapped RVU PF is assigned
a MCE table of size 'num VFs of that PF + PF'.
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

@@ -59,6 +59,20 @@ struct rvu_block {
 	unsigned char name[NAME_SIZE];
 };
 
+struct nix_mcast {
+	struct qmem	*mce_ctx;
+	struct qmem	*mcast_buf;
+	int		replay_pkind;
+	int		next_free_mce;
+	spinlock_t	mce_lock; /* Serialize MCE updates */
+};
+
+struct nix_mce_list {
+	struct hlist_head	head;
+	int			count;
+	int			max;
+};
+
 /* Structure for per RVU func info ie PF/VF */
 struct rvu_pfvf {
 	bool		npalf; /* Only one NPALF per RVU_FUNC */
@@ -93,6 +107,10 @@ struct rvu_pfvf {
 	unsigned long	*cq_bmap;
 
 	u8		mac_addr[ETH_ALEN]; /* MAC address of this PF/VF */
+
+	/* Broadcast pkt replication info */
+	u16			bcast_mce_idx;
+	struct nix_mce_list	bcast_mce_list;
 };
 
 struct nix_txsch {
@@ -108,6 +126,7 @@ struct npc_pkind {
 
 struct nix_hw {
 	struct nix_txsch txsch[NIX_TXSCH_LVL_CNT]; /* Tx schedulers */
+	struct nix_mcast mcast;
 };
 
 struct rvu_hwinfo {

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

@@ -16,6 +16,61 @@
 #include "rvu.h"
 #include "cgx.h"
 
+enum mc_tbl_sz {
+	MC_TBL_SZ_256,
+	MC_TBL_SZ_512,
+	MC_TBL_SZ_1K,
+	MC_TBL_SZ_2K,
+	MC_TBL_SZ_4K,
+	MC_TBL_SZ_8K,
+	MC_TBL_SZ_16K,
+	MC_TBL_SZ_32K,
+	MC_TBL_SZ_64K,
+};
+
+enum mc_buf_cnt {
+	MC_BUF_CNT_8,
+	MC_BUF_CNT_16,
+	MC_BUF_CNT_32,
+	MC_BUF_CNT_64,
+	MC_BUF_CNT_128,
+	MC_BUF_CNT_256,
+	MC_BUF_CNT_512,
+	MC_BUF_CNT_1024,
+	MC_BUF_CNT_2048,
+};
+
+/* For now considering MC resources needed for broadcast
+ * pkt replication only. i.e 256 HWVFs + 12 PFs.
+ */
+#define MC_TBL_SIZE	MC_TBL_SZ_512
+#define MC_BUF_CNT	MC_BUF_CNT_128
+
+struct mce {
+	struct hlist_node	node;
+	u16			idx;
+	u16			pcifunc;
+};
+
+static void nix_mce_list_init(struct nix_mce_list *list, int max)
+{
+	INIT_HLIST_HEAD(&list->head);
+	list->count = 0;
+	list->max = max;
+}
+
+static u16 nix_alloc_mce_list(struct nix_mcast *mcast, int count)
+{
+	int idx;
+
+	if (!mcast)
+		return 0;
+
+	idx = mcast->next_free_mce;
+	mcast->next_free_mce += count;
+	return idx;
+}
+
 static inline struct nix_hw *get_nix_hw(struct rvu_hwinfo *hw, int blkaddr)
 {
 	if (blkaddr == BLKADDR_NIX0 && hw->nix0)
@@ -315,6 +370,19 @@ static int rvu_nix_aq_enq_inst(struct rvu *rvu, struct nix_aq_enq_req *req,
 		    (req->qidx >= (256UL << (cfg & 0xF))))
 			rc = NIX_AF_ERR_AQ_ENQUEUE;
 		break;
+	case NIX_AQ_CTYPE_MCE:
+		cfg = rvu_read64(rvu, blkaddr, NIX_AF_RX_MCAST_CFG);
+		/* Check if index exceeds MCE list length */
+		if (!hw->nix0->mcast.mce_ctx ||
+		    (req->qidx >= (256UL << (cfg & 0xF))))
+			rc = NIX_AF_ERR_AQ_ENQUEUE;
+
+		/* Adding multicast lists for requests from PF/VFs is not
+		 * yet supported, so ignore this.
+		 */
+		if (rsp)
+			rc = NIX_AF_ERR_AQ_ENQUEUE;
+		break;
 	default:
 		rc = NIX_AF_ERR_AQ_ENQUEUE;
 	}
@@ -361,6 +429,9 @@ static int rvu_nix_aq_enq_inst(struct rvu *rvu, struct nix_aq_enq_req *req,
 		else if (req->ctype == NIX_AQ_CTYPE_RSS)
 			memcpy(mask, &req->rss_mask,
 			       sizeof(struct nix_rsse_s));
+		else if (req->ctype == NIX_AQ_CTYPE_MCE)
+			memcpy(mask, &req->mce_mask,
+			       sizeof(struct nix_rx_mce_s));
 		/* Fall through */
 	case NIX_AQ_INSTOP_INIT:
 		if (req->ctype == NIX_AQ_CTYPE_RQ)
@@ -371,6 +442,8 @@ static int rvu_nix_aq_enq_inst(struct rvu *rvu, struct nix_aq_enq_req *req,
 			memcpy(ctx, &req->cq, sizeof(struct nix_cq_ctx_s));
 		else if (req->ctype == NIX_AQ_CTYPE_RSS)
 			memcpy(ctx, &req->rss, sizeof(struct nix_rsse_s));
+		else if (req->ctype == NIX_AQ_CTYPE_MCE)
+			memcpy(ctx, &req->mce, sizeof(struct nix_rx_mce_s));
 		break;
 	case NIX_AQ_INSTOP_NOP:
 	case NIX_AQ_INSTOP_READ:
@@ -446,6 +519,9 @@ static int rvu_nix_aq_enq_inst(struct rvu *rvu, struct nix_aq_enq_req *req,
 			else if (req->ctype == NIX_AQ_CTYPE_RSS)
 				memcpy(&rsp->rss, ctx,
 				       sizeof(struct nix_cq_ctx_s));
+			else if (req->ctype == NIX_AQ_CTYPE_MCE)
+				memcpy(&rsp->mce, ctx,
+				       sizeof(struct nix_rx_mce_s));
 		}
 	}
 
@@ -1041,6 +1117,122 @@ int rvu_mbox_handler_NIX_TXSCHQ_CFG(struct rvu *rvu,
 	return 0;
 }
 
+static int nix_setup_mce(struct rvu *rvu, int mce, u8 op,
+			 u16 pcifunc, int next, bool eol)
+{
+	struct nix_aq_enq_req aq_req;
+	int err;
+
+	aq_req.hdr.pcifunc = pcifunc;
+	aq_req.ctype = NIX_AQ_CTYPE_MCE;
+	aq_req.op = op;
+	aq_req.qidx = mce;
+
+	/* Forward bcast pkts to RQ0, RSS not needed */
+	aq_req.mce.op = 0;
+	aq_req.mce.index = 0;
+	aq_req.mce.eol = eol;
+	aq_req.mce.pf_func = pcifunc;
+	aq_req.mce.next = next;
+
+	/* All fields valid */
+	*(u64 *)(&aq_req.mce_mask) = ~0ULL;
+
+	err = rvu_nix_aq_enq_inst(rvu, &aq_req, NULL);
+	if (err) {
+		dev_err(rvu->dev, "Failed to setup Bcast MCE for PF%d:VF%d\n",
+			rvu_get_pf(pcifunc), pcifunc & RVU_PFVF_FUNC_MASK);
+		return err;
+	}
+	return 0;
+}
+
+static int nix_setup_bcast_tables(struct rvu *rvu, struct nix_hw *nix_hw)
+{
+	struct nix_mcast *mcast = &nix_hw->mcast;
+	int err, pf, numvfs, idx;
+	struct rvu_pfvf *pfvf;
+	u16 pcifunc;
+	u64 cfg;
+
+	/* Skip PF0 (i.e AF) */
+	for (pf = 1; pf < (rvu->cgx_mapped_pfs + 1); pf++) {
+		cfg = rvu_read64(rvu, BLKADDR_RVUM, RVU_PRIV_PFX_CFG(pf));
+		/* If PF is not enabled, nothing to do */
+		if (!((cfg >> 20) & 0x01))
+			continue;
+		/* Get numVFs attached to this PF */
+		numvfs = (cfg >> 12) & 0xFF;
+
+		pfvf = &rvu->pf[pf];
+		/* Save the start MCE */
+		pfvf->bcast_mce_idx = nix_alloc_mce_list(mcast, numvfs + 1);
+
+		nix_mce_list_init(&pfvf->bcast_mce_list, numvfs + 1);
+
+		for (idx = 0; idx < (numvfs + 1); idx++) {
+			/* idx-0 is for PF, followed by VFs */
+			pcifunc = (pf << RVU_PFVF_PF_SHIFT);
+			pcifunc |= idx;
+			/* Add dummy entries now, so that we don't have to check
+			 * for whether AQ_OP should be INIT/WRITE later on.
+			 * Will be updated when a NIXLF is attached/detached to
+			 * these PF/VFs.
+			 */
+			err = nix_setup_mce(rvu, pfvf->bcast_mce_idx + idx,
+					    NIX_AQ_INSTOP_INIT,
+					    pcifunc, 0, true);
+			if (err)
+				return err;
+		}
+	}
+	return 0;
+}
+
+static int nix_setup_mcast(struct rvu *rvu, struct nix_hw *nix_hw, int blkaddr)
+{
+	struct nix_mcast *mcast = &nix_hw->mcast;
+	struct rvu_hwinfo *hw = rvu->hw;
+	int err, size;
+
+	size = (rvu_read64(rvu, blkaddr, NIX_AF_CONST3) >> 16) & 0x0F;
+	size = (1ULL << size);
+
+	/* Alloc memory for multicast/mirror replication entries */
+	err = qmem_alloc(rvu->dev, &mcast->mce_ctx,
+			 (256UL << MC_TBL_SIZE), size);
+	if (err)
+		return -ENOMEM;
+
+	rvu_write64(rvu, blkaddr, NIX_AF_RX_MCAST_BASE,
+		    (u64)mcast->mce_ctx->iova);
+
+	/* Set max list length equal to max no of VFs per PF  + PF itself */
+	rvu_write64(rvu, blkaddr, NIX_AF_RX_MCAST_CFG,
+		    BIT_ULL(36) | (hw->max_vfs_per_pf << 4) | MC_TBL_SIZE);
+
+	/* Alloc memory for multicast replication buffers */
+	size = rvu_read64(rvu, blkaddr, NIX_AF_MC_MIRROR_CONST) & 0xFFFF;
+	err = qmem_alloc(rvu->dev, &mcast->mcast_buf,
+			 (8UL << MC_BUF_CNT), size);
+	if (err)
+		return -ENOMEM;
+
+	rvu_write64(rvu, blkaddr, NIX_AF_RX_MCAST_BUF_BASE,
+		    (u64)mcast->mcast_buf->iova);
+
+	/* Alloc pkind for NIX internal RX multicast/mirror replay */
+	mcast->replay_pkind = rvu_alloc_rsrc(&hw->pkind.rsrc);
+
+	rvu_write64(rvu, blkaddr, NIX_AF_RX_MCAST_BUF_CFG,
+		    BIT_ULL(63) | (mcast->replay_pkind << 24) |
+		    BIT_ULL(20) | MC_BUF_CNT);
+
+	spin_lock_init(&mcast->mce_lock);
+
+	return nix_setup_bcast_tables(rvu, nix_hw);
+}
+
 static int nix_setup_txschq(struct rvu *rvu, struct nix_hw *nix_hw, int blkaddr)
 {
 	struct nix_txsch *txsch;
@@ -1242,6 +1434,10 @@ int rvu_nix_init(struct rvu *rvu)
 		err = nix_setup_txschq(rvu, hw->nix0, blkaddr);
 		if (err)
 			return err;
+
+		err = nix_setup_mcast(rvu, hw->nix0, blkaddr);
+		if (err)
+			return err;
 	}
 	return 0;
 }
@@ -1251,6 +1447,7 @@ void rvu_nix_freemem(struct rvu *rvu)
 	struct rvu_hwinfo *hw = rvu->hw;
 	struct rvu_block *block;
 	struct nix_txsch *txsch;
+	struct nix_mcast *mcast;
 	struct nix_hw *nix_hw;
 	int blkaddr, lvl;
 
@@ -1270,5 +1467,9 @@ void rvu_nix_freemem(struct rvu *rvu)
 			txsch = &nix_hw->txsch[lvl];
 			kfree(txsch->schq.bmap);
 		}
+
+		mcast = &nix_hw->mcast;
+		qmem_free(rvu->dev, mcast->mce_ctx);
+		qmem_free(rvu->dev, mcast->mcast_buf);
 	}
 }