drivers: net: xgene: Adding support for TSO

Signed-off-by: Iyappan Subramanian <isubramanian@apm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -193,12 +193,16 @@ enum xgene_enet_rm {
 #define USERINFO_LEN			32
 #define FPQNUM_POS			32
 #define FPQNUM_LEN			12
+#define NV_POS				50
+#define NV_LEN				1
+#define LL_POS				51
+#define LL_LEN				1
 #define LERR_POS			60
 #define LERR_LEN			3
 #define STASH_POS			52
 #define STASH_LEN			2
 #define BUFDATALEN_POS			48
-#define BUFDATALEN_LEN			12
+#define BUFDATALEN_LEN			15
 #define DATAADDR_POS			0
 #define DATAADDR_LEN			42
 #define COHERENT_POS			63
@@ -215,9 +219,19 @@ enum xgene_enet_rm {
 #define IPHDR_LEN			6
 #define EC_POS				22	/* Enable checksum */
 #define EC_LEN				1
+#define ET_POS				23	/* Enable TSO */
 #define IS_POS				24	/* IP protocol select */
 #define IS_LEN				1
 #define TYPE_ETH_WORK_MESSAGE_POS	44
+#define LL_BYTES_MSB_POS		56
+#define LL_BYTES_MSB_LEN		8
+#define LL_BYTES_LSB_POS		48
+#define LL_BYTES_LSB_LEN		12
+#define LL_LEN_POS			48
+#define LL_LEN_LEN			8
+#define DATALEN_MASK			GENMASK(11, 0)
+
+#define LAST_BUFFER			(0x7800ULL << BUFDATALEN_POS)
 
 struct xgene_enet_raw_desc {
 	__le64 m0;

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

@@ -43,6 +43,9 @@
 #define BUFLEN_16K	(16 * 1024)
 #define NUM_PKT_BUF	64
 #define NUM_BUFPOOL	32
+#define MAX_EXP_BUFFS	256
+#define XGENE_ENET_MSS	1448
+#define XGENE_MIN_ENET_FRAME_SIZE	60
 
 #define START_CPU_BUFNUM_0	0
 #define START_ETH_BUFNUM_0	2
@@ -80,6 +83,7 @@ struct xgene_enet_desc_ring {
 	u16 num;
 	u16 head;
 	u16 tail;
+	u16 exp_buf_tail;
 	u16 slots;
 	u16 irq;
 	char irq_name[IRQ_ID_SIZE];
@@ -94,6 +98,7 @@ struct xgene_enet_desc_ring {
 	u8 nbufpool;
 	struct sk_buff *(*rx_skb);
 	struct sk_buff *(*cp_skb);
+	dma_addr_t *frag_dma_addr;
 	enum xgene_enet_ring_cfgsize cfgsize;
 	struct xgene_enet_desc_ring *cp_ring;
 	struct xgene_enet_desc_ring *buf_pool;
@@ -103,6 +108,7 @@ struct xgene_enet_desc_ring {
 		struct xgene_enet_raw_desc *raw_desc;
 		struct xgene_enet_raw_desc16 *raw_desc16;
 	};
+	__le64 *exp_bufs;
 };
 
 struct xgene_mac_ops {
@@ -113,6 +119,7 @@ struct xgene_mac_ops {
 	void (*tx_disable)(struct xgene_enet_pdata *pdata);
 	void (*rx_disable)(struct xgene_enet_pdata *pdata);
 	void (*set_mac_addr)(struct xgene_enet_pdata *pdata);
+	void (*set_mss)(struct xgene_enet_pdata *pdata);
 	void (*link_state)(struct work_struct *work);
 };
 
@@ -171,6 +178,7 @@ struct xgene_enet_pdata {
 	u8 eth_bufnum;
 	u8 bp_bufnum;
 	u16 ring_num;
+	u32 mss;
 };
 
 struct xgene_indirect_ctl {
@@ -205,6 +213,9 @@ static inline u64 xgene_enet_get_field_value(int pos, int len, u64 src)
 #define GET_VAL(field, src) \
 		xgene_enet_get_field_value(field ## _POS, field ## _LEN, src)
 
+#define GET_BIT(field, src) \
+		xgene_enet_get_field_value(field ## _POS, 1, src)
+
 static inline struct device *ndev_to_dev(struct net_device *ndev)
 {
 	return ndev->dev.parent;

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

@@ -184,6 +184,11 @@ static void xgene_xgmac_set_mac_addr(struct xgene_enet_pdata *pdata)
 	xgene_enet_wr_mac(pdata, HSTMACADR_MSW_ADDR, addr1);
 }
 
+static void xgene_xgmac_set_mss(struct xgene_enet_pdata *pdata)
+{
+	xgene_enet_wr_csr(pdata, XG_TSIF_MSS_REG0_ADDR, pdata->mss);
+}
+
 static u32 xgene_enet_link_status(struct xgene_enet_pdata *pdata)
 {
 	u32 data;
@@ -204,8 +209,8 @@ static void xgene_xgmac_init(struct xgene_enet_pdata *pdata)
 	data &= ~HSTLENCHK;
 	xgene_enet_wr_mac(pdata, AXGMAC_CONFIG_1, data);
 
-	xgene_enet_wr_mac(pdata, HSTMAXFRAME_LENGTH_ADDR, 0x06000600);
 	xgene_xgmac_set_mac_addr(pdata);
+	xgene_xgmac_set_mss(pdata);
 
 	xgene_enet_rd_csr(pdata, XG_RSIF_CONFIG_REG_ADDR, &data);
 	data |= CFG_RSIF_FPBUFF_TIMEOUT_EN;
@@ -329,6 +334,7 @@ struct xgene_mac_ops xgene_xgmac_ops = {
 	.rx_disable = xgene_xgmac_rx_disable,
 	.tx_disable = xgene_xgmac_tx_disable,
 	.set_mac_addr = xgene_xgmac_set_mac_addr,
+	.set_mss = xgene_xgmac_set_mss,
 	.link_state = xgene_enet_link_state
 };
 

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

@@ -62,7 +62,9 @@
 #define XCLE_BYPASS_REG0_ADDR           0x0160
 #define XCLE_BYPASS_REG1_ADDR           0x0164
 #define XG_CFG_BYPASS_ADDR		0x0204
+#define XG_CFG_LINK_AGGR_RESUME_0_ADDR	0x0214
 #define XG_LINK_STATUS_ADDR		0x0228
+#define XG_TSIF_MSS_REG0_ADDR		0x02a4
 #define XG_ENET_SPARE_CFG_REG_ADDR	0x040c
 #define XG_ENET_SPARE_CFG_REG_1_ADDR	0x0410
 #define XGENET_RX_DV_GATE_REG_0_ADDR	0x0804