drivers: net: xgene: Add support for Jumbo frame

This patch adds support for jumbo frame, by allocating
additional buffer (page) pool and configuring the hardware.
Signed-off-by: Iyappan Subramanian <isubramanian@apm.com>
Signed-off-by: Quan Nguyen <qnguyen@apm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/apm/xgene/xgene_enet_hw.c

@@ -679,6 +679,9 @@ static void xgene_gport_shutdown(struct xgene_enet_pdata *pdata)
 	for (i = 0; i < pdata->rxq_cnt; i++) {
 		ring = pdata->rx_ring[i]->buf_pool;
 		pb |= BIT(xgene_enet_get_fpsel(ring->id));
+		ring = pdata->rx_ring[i]->page_pool;
+		if (ring)
+			pb |= BIT(xgene_enet_get_fpsel(ring->id));
 
 	}
 	xgene_enet_wr_ring_if(pdata, ENET_CFGSSQMIFPRESET_ADDR, pb);

drivers/net/ethernet/apm/xgene/xgene_enet_main.h

@@ -41,11 +41,14 @@
 #include "../../../phy/mdio-xgene.h"
 
 #define XGENE_DRV_VERSION	"v1.0"
-#define XGENE_ENET_MAX_MTU	1536
-#define SKB_BUFFER_SIZE		(XGENE_ENET_MAX_MTU - NET_IP_ALIGN)
+#define XGENE_ENET_STD_MTU	1536
+#define XGENE_ENET_MAX_MTU	9600
+#define SKB_BUFFER_SIZE		(XGENE_ENET_STD_MTU - NET_IP_ALIGN)
+
 #define BUFLEN_16K	(16 * 1024)
-#define NUM_PKT_BUF	64
+#define NUM_PKT_BUF	1024
 #define NUM_BUFPOOL	32
+#define NUM_NXTBUFPOOL	8
 #define MAX_EXP_BUFFS	256
 #define NUM_MSS_REG	4
 #define XGENE_MIN_ENET_FRAME_SIZE	60
@@ -88,6 +91,12 @@ enum xgene_enet_id {
 	XGENE_ENET2
 };
 
+enum xgene_enet_buf_len {
+	SIZE_2K = 2048,
+	SIZE_4K = 4096,
+	SIZE_16K = 16384
+};
+
 /* software context of a descriptor ring */
 struct xgene_enet_desc_ring {
 	struct net_device *ndev;
@@ -107,11 +116,14 @@ struct xgene_enet_desc_ring {
 	dma_addr_t irq_mbox_dma;
 	void *irq_mbox_addr;
 	u16 dst_ring_num;
-	u8 nbufpool;
+	u16 nbufpool;
+	int npagepool;
 	u8 index;
+	u32 flags;
 	struct sk_buff *(*rx_skb);
 	struct sk_buff *(*cp_skb);
 	dma_addr_t *frag_dma_addr;
+	struct page *(*frag_page);
 	enum xgene_enet_ring_cfgsize cfgsize;
 	struct xgene_enet_desc_ring *cp_ring;
 	struct xgene_enet_desc_ring *buf_pool;

drivers/net/ethernet/apm/xgene/xgene_enet_ring2.c

@@ -119,6 +119,7 @@ static void xgene_enet_set_ring_id(struct xgene_enet_desc_ring *ring)
 
 	ring_id_buf = (ring->num << 9) & GENMASK(18, 9);
 	ring_id_buf |= PREFETCH_BUF_EN;
+
 	if (is_bufpool)
 		ring_id_buf |= IS_BUFFER_POOL;
 

drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c

@@ -536,6 +536,9 @@ static void xgene_enet_shutdown(struct xgene_enet_pdata *p)
 	for (i = 0; i < p->rxq_cnt; i++) {
 		ring = p->rx_ring[i]->buf_pool;
 		pb |= BIT(xgene_enet_get_fpsel(ring->id));
+		ring = p->rx_ring[i]->page_pool;
+		if (ring)
+			pb |= BIT(xgene_enet_get_fpsel(ring->id));
 	}
 	xgene_enet_wr_ring_if(p, ENET_CFGSSQMIFPRESET_ADDR, pb);
 

drivers/net/ethernet/apm/xgene/xgene_enet_xgmac.c

@@ -367,6 +367,7 @@ static void xgene_enet_xgcle_bypass(struct xgene_enet_pdata *pdata,
 	CFG_CLE_FPSEL0_SET(&cb, fpsel);
 	CFG_CLE_NXTFPSEL0_SET(&cb, nxtfpsel);
 	xgene_enet_wr_csr(pdata, XCLE_BYPASS_REG1_ADDR, cb);
+	pr_info("+ cle_bypass: fpsel: %d nxtfpsel: %d\n", fpsel, nxtfpsel);
 }
 
 static void xgene_enet_shutdown(struct xgene_enet_pdata *pdata)
@@ -380,6 +381,9 @@ static void xgene_enet_shutdown(struct xgene_enet_pdata *pdata)
 	for (i = 0; i < pdata->rxq_cnt; i++) {
 		ring = pdata->rx_ring[i]->buf_pool;
 		pb |= BIT(xgene_enet_get_fpsel(ring->id));
+		ring = pdata->rx_ring[i]->page_pool;
+		if (ring)
+			pb |= BIT(xgene_enet_get_fpsel(ring->id));
 	}
 	xgene_enet_wr_ring_if(pdata, ENET_CFGSSQMIFPRESET_ADDR, pb);