octeontx2-af: cn10kb: Add RPM_USX MAC support

OcteonTx2's next gen platform the CN10KB has RPM_USX MAC which has a
different serdes when compared to RPM MAC. Though the underlying
HW is different, the CSR interface has been designed largely inline
with RPM MAC, with few exceptions though. So we are using the same
CGX driver for RPM_USX MAC as well and will have a different set of APIs
for RPM_USX where ever necessary.

The RPM and RPM_USX blocks support a different number of LMACS.
RPM_USX support 8 LMACS per MAC block whereas legacy RPM supports only 4
LMACS per MAC. with this RPM_USX support double the number of DMAC filters
and fifo size.

This patch adds initial support for CN10KB's RPM_USX  MAC i.e registering
the driver and defining MAC operations (mac_ops). Adds the logic to
configure internal loopback and pause frames and assign FIFO length to
LMACS.

Kernel reads lmac features like lmac type, autoneg, etc from shared
firmware data this structure only supports 4 lmacs per MAC, this patch
extends this structure to accommodate 8 lmacs.

Signed-off-by: Hariprasad Kelam <[email protected]>
Signed-off-by: Sunil Kovvuri Goutham <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>

Author: Hariprasad Kelam

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

@@ -64,6 +64,7 @@ static int cgx_fwi_link_change(struct cgx *cgx, int lmac_id, bool en);
 static const struct pci_device_id cgx_id_table[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, PCI_DEVID_OCTEONTX2_CGX) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, PCI_DEVID_CN10K_RPM) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, PCI_DEVID_CN10KB_RPM) },
 	{ 0, }  /* end of table */
 };
 
@@ -73,7 +74,8 @@ static bool is_dev_rpm(void *cgxd)
 {
 	struct cgx *cgx = cgxd;
 
-	return (cgx->pdev->device == PCI_DEVID_CN10K_RPM);
+	return (cgx->pdev->device == PCI_DEVID_CN10K_RPM) ||
+	       (cgx->pdev->device == PCI_DEVID_CN10KB_RPM);
 }
 
 bool is_lmac_valid(struct cgx *cgx, int lmac_id)
@@ -485,7 +487,7 @@ int cgx_set_pkind(void *cgxd, u8 lmac_id, int pkind)
 	if (!is_lmac_valid(cgx, lmac_id))
 		return -ENODEV;
 
-	cgx_write(cgx, lmac_id, CGXX_CMRX_RX_ID_MAP, (pkind & 0x3F));
+	cgx_write(cgx, lmac_id, cgx->mac_ops->rxid_map_offset, (pkind & 0x3F));
 	return 0;
 }
 
@@ -1224,7 +1226,7 @@ static inline void link_status_user_format(u64 lstat,
 	linfo->speed = cgx_speed_mbps[FIELD_GET(RESP_LINKSTAT_SPEED, lstat)];
 	linfo->an = FIELD_GET(RESP_LINKSTAT_AN, lstat);
 	linfo->fec = FIELD_GET(RESP_LINKSTAT_FEC, lstat);
-	linfo->lmac_type_id = cgx_get_lmac_type(cgx, lmac_id);
+	linfo->lmac_type_id = FIELD_GET(RESP_LINKSTAT_LMAC_TYPE, lstat);
 	lmac_string = cgx_lmactype_string[linfo->lmac_type_id];
 	strncpy(linfo->lmac_type, lmac_string, LMACTYPE_STR_LEN - 1);
 }
@@ -1599,8 +1601,14 @@ static int cgx_lmac_init(struct cgx *cgx)
 	/* lmac_list specifies which lmacs are enabled
 	 * when bit n is set to 1, LMAC[n] is enabled
 	 */
-	if (cgx->mac_ops->non_contiguous_serdes_lane)
-		lmac_list = cgx_read(cgx, 0, CGXX_CMRX_RX_LMACS) & 0xFULL;
+	if (cgx->mac_ops->non_contiguous_serdes_lane) {
+		if (is_dev_rpm2(cgx))
+			lmac_list =
+				cgx_read(cgx, 0, RPM2_CMRX_RX_LMACS) & 0xFFULL;
+		else
+			lmac_list =
+				cgx_read(cgx, 0, CGXX_CMRX_RX_LMACS) & 0xFULL;
+	}
 
 	if (cgx->lmac_count > cgx->max_lmac_per_mac)
 		cgx->lmac_count = cgx->max_lmac_per_mac;
@@ -1624,7 +1632,9 @@ static int cgx_lmac_init(struct cgx *cgx)
 
 		lmac->cgx = cgx;
 		lmac->mac_to_index_bmap.max =
-				MAX_DMAC_ENTRIES_PER_CGX / cgx->lmac_count;
+				cgx->mac_ops->dmac_filter_count /
+				cgx->lmac_count;
+
 		err = rvu_alloc_bitmap(&lmac->mac_to_index_bmap);
 		if (err)
 			goto err_name_free;
@@ -1711,6 +1721,15 @@ static void cgx_populate_features(struct cgx *cgx)
 				    RVU_LMAC_FEAT_PTP | RVU_LMAC_FEAT_DMACF);
 }
 
+static u8 cgx_get_rxid_mapoffset(struct cgx *cgx)
+{
+	if (cgx->pdev->subsystem_device == PCI_SUBSYS_DEVID_CNF10KB_RPM ||
+	    is_dev_rpm2(cgx))
+		return 0x80;
+	else
+		return 0x60;
+}
+
 static struct mac_ops	cgx_mac_ops    = {
 	.name		=       "cgx",
 	.csr_offset	=       0,
@@ -1723,6 +1742,7 @@ static struct mac_ops	cgx_mac_ops    = {
 	.non_contiguous_serdes_lane = false,
 	.rx_stats_cnt   =       9,
 	.tx_stats_cnt   =       18,
+	.dmac_filter_count =    32,
 	.get_nr_lmacs	=	cgx_get_nr_lmacs,
 	.get_lmac_type  =       cgx_get_lmac_type,
 	.lmac_fifo_len	=	cgx_get_lmac_fifo_len,
@@ -1754,11 +1774,13 @@ static int cgx_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	pci_set_drvdata(pdev, cgx);
 
 	/* Use mac_ops to get MAC specific features */
-	if (pdev->device == PCI_DEVID_CN10K_RPM)
-		cgx->mac_ops = rpm_get_mac_ops();
+	if (is_dev_rpm(cgx))
+		cgx->mac_ops = rpm_get_mac_ops(cgx);
 	else
 		cgx->mac_ops = &cgx_mac_ops;
 
+	cgx->mac_ops->rxid_map_offset = cgx_get_rxid_mapoffset(cgx);
+
 	err = pci_enable_device(pdev);
 	if (err) {
 		dev_err(dev, "Failed to enable PCI device\n");

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

@@ -19,7 +19,6 @@
 #define PCI_CFG_REG_BAR_NUM		0
 
 #define CGX_ID_MASK			0xF
-#define MAX_DMAC_ENTRIES_PER_CGX	32
 
 /* Registers */
 #define CGXX_CMRX_CFG			0x00
@@ -53,7 +52,7 @@
 #define CGXX_SCRATCH0_REG		0x1050
 #define CGXX_SCRATCH1_REG		0x1058
 #define CGX_CONST			0x2000
-#define CGX_CONST_RXFIFO_SIZE	        GENMASK_ULL(23, 0)
+#define CGX_CONST_RXFIFO_SIZE	        GENMASK_ULL(55, 32)
 #define CGX_CONST_MAX_LMACS	        GENMASK_ULL(31, 24)
 #define CGXX_SPUX_CONTROL1		0x10000
 #define CGXX_SPUX_LNX_FEC_CORR_BLOCKS	0x10700

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

@@ -75,6 +75,11 @@ struct mac_ops {
 	/* RPM & CGX differs in number of Receive/transmit stats */
 	u8			rx_stats_cnt;
 	u8			tx_stats_cnt;
+	/* Unlike CN10K which shares same CSR offset with CGX
+	 * CNF10KB has different csr offset
+	 */
+	u64			rxid_map_offset;
+	u8			dmac_filter_count;
 	/* Incase of RPM get number of lmacs from RPMX_CMR_RX_LMACS[LMAC_EXIST]
 	 * number of setbits in lmac_exist tells number of lmacs
 	 */
@@ -153,6 +158,6 @@ struct lmac *lmac_pdata(u8 lmac_id, struct cgx *cgx);
 int cgx_fwi_cmd_send(u64 req, u64 *resp, struct lmac *lmac);
 int cgx_fwi_cmd_generic(u64 req, u64 *resp, struct cgx *cgx, int lmac_id);
 bool is_lmac_valid(struct cgx *cgx, int lmac_id);
-struct mac_ops *rpm_get_mac_ops(void);
+struct mac_ops *rpm_get_mac_ops(struct cgx *cgx);
 
 #endif /* LMAC_COMMON_H */