Message-Id: <1256826258-663-1-git-send-email-Sandeep.Kumar@freescale.com>
Date:	Thu, 29 Oct 2009 19:54:18 +0530
From:	Sandeep Gopalpet <Sandeep.Kumar@...escale.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, afleming@...escale.com,
	Sandeep Gopalpet <sandeep.kumar@...escale.com>
Subject: [PATCH v3 7/7] gianfar: Basic Support for programming hash rules

From: Sandeep Gopalpet <sandeep.kumar@...escale.com>

This patch provides basic hash rules programming via the ethtool
interface.

Signed-off-by: Sandeep Gopalpet <sandeep.kumar@...escale.com>
---
 *. Rebased to the net-next-2.6 tree as of 20091028 cloned from
    http://www.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6.git

 drivers/net/gianfar.c         |   73 +++++++++++++
 drivers/net/gianfar.h         |   93 ++++++++++++++++
 drivers/net/gianfar_ethtool.c |  236 +++++++++++++++++++++++++++++++++++++++++
 include/linux/ethtool.h       |    2 +
 4 files changed, 404 insertions(+), 0 deletions(-)

diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index daff741..1b1a8b4 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -416,6 +416,9 @@ static const struct net_device_ops gfar_netdev_ops = {
 #endif
 };
 
+unsigned int ftp_rqfpr[MAX_FILER_IDX + 1];
+unsigned int ftp_rqfcr[MAX_FILER_IDX + 1];
+
 inline void lock_rx_qs(struct gfar_private *priv)
 {
 	int i = 0x0;
@@ -751,6 +754,73 @@ static unsigned int reverse_bitmap(unsigned int bit_map, unsigned int max_qs)
 	}
 	return new_bit_map;
 }
+
+u32 cluster_entry_per_class(struct gfar_private *priv, u32 rqfar, u32 class)
+{
+	u32 rqfpr = FPR_FILER_MASK;
+	u32 rqfcr = 0x0;
+
+	rqfar--;
+	rqfcr = RQFCR_CLE | RQFCR_PID_MASK | RQFCR_CMP_EXACT;
+	ftp_rqfpr[rqfar] = rqfpr;
+	ftp_rqfcr[rqfar] = rqfcr;
+	gfar_write_filer(priv, rqfar, rqfcr, rqfpr);
+
+	rqfar--;
+	rqfcr = RQFCR_CMP_NOMATCH;
+	ftp_rqfpr[rqfar] = rqfpr;
+	ftp_rqfcr[rqfar] = rqfcr;
+	gfar_write_filer(priv, rqfar, rqfcr, rqfpr);
+
+	rqfar--;
+	rqfcr = RQFCR_CMP_EXACT | RQFCR_PID_PARSE | RQFCR_CLE | RQFCR_AND;
+	rqfpr = class;
+	ftp_rqfcr[rqfar] = rqfcr;
+	ftp_rqfpr[rqfar] = rqfpr;
+	gfar_write_filer(priv, rqfar, rqfcr, rqfpr);
+
+	rqfar--;
+	rqfcr = RQFCR_CMP_EXACT | RQFCR_PID_MASK | RQFCR_AND;
+	rqfpr = class;
+	ftp_rqfcr[rqfar] = rqfcr;
+	ftp_rqfpr[rqfar] = rqfpr;
+	gfar_write_filer(priv, rqfar, rqfcr, rqfpr);
+
+	return rqfar;
+}
+
+static void gfar_init_filer_table(struct gfar_private *priv)
+{
+	int i = 0x0;
+	u32 rqfar = MAX_FILER_IDX;
+	u32 rqfcr = 0x0;
+	u32 rqfpr = FPR_FILER_MASK;
+
+	/* Default rule */
+	rqfcr = RQFCR_CMP_MATCH;
+	ftp_rqfcr[rqfar] = rqfcr;
+	ftp_rqfpr[rqfar] = rqfpr;
+	gfar_write_filer(priv, rqfar, rqfcr, rqfpr);
+
+	rqfar = cluster_entry_per_class(priv, rqfar, RQFPR_IPV6);
+	rqfar = cluster_entry_per_class(priv, rqfar, RQFPR_IPV6 | RQFPR_UDP);
+	rqfar = cluster_entry_per_class(priv, rqfar, RQFPR_IPV6 | RQFPR_TCP);
+	rqfar = cluster_entry_per_class(priv, rqfar, RQFPR_IPV4);
+	rqfar = cluster_entry_per_class(priv, rqfar, RQFPR_IPV4 | RQFPR_UDP);
+	rqfar = cluster_entry_per_class(priv, rqfar, RQFPR_IPV4 | RQFPR_TCP);
+
+	/* cur_filer_idx indicated the fisrt non-masked rule */
+	priv->cur_filer_idx = rqfar;
+
+	/* Rest are masked rules */
+	rqfcr = RQFCR_CMP_NOMATCH;
+	for (i = 0; i < rqfar; i++) {
+		ftp_rqfcr[i] = rqfcr;
+		ftp_rqfpr[i] = rqfpr;
+		gfar_write_filer(priv, i, rqfcr, rqfpr);
+	}
+}
+
 /* Set up the ethernet device structure, private data,
  * and anything else we need before we start */
 static int gfar_probe(struct of_device *ofdev,
@@ -990,6 +1060,9 @@ static int gfar_probe(struct of_device *ofdev,
 			priv->gfargrp[i].int_name_tx[len_devname] = '\0';
 	}
 
+	/* Initialize the filer table */
+	gfar_init_filer_table(priv);
+
 	/* Create all the sysfs files */
 	gfar_init_sysfs(dev);
 
diff --git a/drivers/net/gianfar.h b/drivers/net/gianfar.h
index a43b238..1c9fdea 100644
--- a/drivers/net/gianfar.h
+++ b/drivers/net/gianfar.h
@@ -381,6 +381,84 @@ extern const char gfar_driver_version[];
 #define BD_LFLAG(flags) ((flags) << 16)
 #define BD_LENGTH_MASK		0x0000ffff
 
+#define CLASS_CODE_UNRECOG		0x00
+#define CLASS_CODE_DUMMY1		0x01
+#define CLASS_CODE_ETHERTYPE1		0x02
+#define CLASS_CODE_ETHERTYPE2		0x03
+#define CLASS_CODE_USER_PROG1		0x04
+#define CLASS_CODE_USER_PROG2		0x05
+#define CLASS_CODE_USER_PROG3		0x06
+#define CLASS_CODE_USER_PROG4		0x07
+#define CLASS_CODE_TCP_IPV4		0x08
+#define CLASS_CODE_UDP_IPV4		0x09
+#define CLASS_CODE_AH_ESP_IPV4		0x0a
+#define CLASS_CODE_SCTP_IPV4		0x0b
+#define CLASS_CODE_TCP_IPV6		0x0c
+#define CLASS_CODE_UDP_IPV6		0x0d
+#define CLASS_CODE_AH_ESP_IPV6		0x0e
+#define CLASS_CODE_SCTP_IPV6		0x0f
+
+#define FPR_FILER_MASK	0xFFFFFFFF
+#define MAX_FILER_IDX	0xFF
+
+/* RQFCR register bits */
+#define RQFCR_GPI		0x80000000
+#define RQFCR_HASHTBL_Q		0x00000000
+#define RQFCR_HASHTBL_0		0x00020000
+#define RQFCR_HASHTBL_1		0x00040000
+#define RQFCR_HASHTBL_2		0x00060000
+#define RQFCR_HASHTBL_3		0x00080000
+#define RQFCR_HASH		0x00010000
+#define RQFCR_CLE		0x00000200
+#define RQFCR_RJE		0x00000100
+#define RQFCR_AND		0x00000080
+#define RQFCR_CMP_EXACT		0x00000000
+#define RQFCR_CMP_MATCH		0x00000020
+#define RQFCR_CMP_NOEXACT	0x00000040
+#define RQFCR_CMP_NOMATCH	0x00000060
+
+/* RQFCR PID values */
+#define	RQFCR_PID_MASK		0x00000000
+#define	RQFCR_PID_PARSE		0x00000001
+#define	RQFCR_PID_ARB		0x00000002
+#define	RQFCR_PID_DAH		0x00000003
+#define	RQFCR_PID_DAL		0x00000004
+#define	RQFCR_PID_SAH		0x00000005
+#define	RQFCR_PID_SAL		0x00000006
+#define	RQFCR_PID_ETY		0x00000007
+#define	RQFCR_PID_VID		0x00000008
+#define	RQFCR_PID_PRI		0x00000009
+#define	RQFCR_PID_TOS		0x0000000A
+#define	RQFCR_PID_L4P		0x0000000B
+#define	RQFCR_PID_DIA		0x0000000C
+#define	RQFCR_PID_SIA		0x0000000D
+#define	RQFCR_PID_DPT		0x0000000E
+#define	RQFCR_PID_SPT		0x0000000F
+
+/* RQFPR when PID is 0x0001 */
+#define RQFPR_HDR_GE_512	0x00200000
+#define RQFPR_LERR		0x00100000
+#define RQFPR_RAR		0x00080000
+#define RQFPR_RARQ		0x00040000
+#define RQFPR_AR		0x00020000
+#define RQFPR_ARQ		0x00010000
+#define RQFPR_EBC		0x00008000
+#define RQFPR_VLN		0x00004000
+#define RQFPR_CFI		0x00002000
+#define RQFPR_JUM		0x00001000
+#define RQFPR_IPF		0x00000800
+#define RQFPR_FIF		0x00000400
+#define RQFPR_IPV4		0x00000200
+#define RQFPR_IPV6		0x00000100
+#define RQFPR_ICC		0x00000080
+#define RQFPR_ICV		0x00000040
+#define RQFPR_TCP		0x00000020
+#define RQFPR_UDP		0x00000010
+#define RQFPR_TUC		0x00000008
+#define RQFPR_TUV		0x00000004
+#define RQFPR_PER		0x00000002
+#define RQFPR_EER		0x00000001
+
 /* TxBD status field bits */
 #define TXBD_READY		0x8000
 #define TXBD_PADCRC		0x4000
@@ -958,6 +1036,8 @@ struct gfar_private {
 	unsigned int rx_stash_size;
 	unsigned int rx_stash_index;
 
+	u32 cur_filer_idx;
+
 	struct sk_buff_head rx_recycle;
 
 	struct vlan_group *vlgrp;
@@ -1001,6 +1081,9 @@ struct gfar_private {
 	struct gfar_extra_stats extra_stats;
 };
 
+extern unsigned int ftp_rqfpr[MAX_FILER_IDX + 1];
+extern unsigned int ftp_rqfcr[MAX_FILER_IDX + 1];
+
 static inline u32 gfar_read(volatile unsigned __iomem *addr)
 {
 	u32 val;
@@ -1013,6 +1096,16 @@ static inline void gfar_write(volatile unsigned __iomem *addr, u32 val)
 	out_be32(addr, val);
 }
 
+static inline void gfar_write_filer(struct gfar_private *priv,
+		unsigned int far, unsigned int fcr, unsigned int fpr)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+
+	gfar_write(&regs->rqfar, far);
+	gfar_write(&regs->rqfcr, fcr);
+	gfar_write(&regs->rqfpr, fpr);
+}
+
 extern inline void lock_rx_qs(struct gfar_private *priv);
 extern inline void lock_tx_qs(struct gfar_private *priv);
 extern inline void unlock_rx_qs(struct gfar_private *priv);
diff --git a/drivers/net/gianfar_ethtool.c b/drivers/net/gianfar_ethtool.c
index 562f6c2..1010367 100644
--- a/drivers/net/gianfar_ethtool.c
+++ b/drivers/net/gianfar_ethtool.c
@@ -645,6 +645,241 @@ static int gfar_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
 }
 #endif
 
+static int gfar_ethflow_to_class(int flow_type, u64 *class)
+{
+	switch (flow_type) {
+	case TCP_V4_FLOW:
+		*class = CLASS_CODE_TCP_IPV4;
+		break;
+	case UDP_V4_FLOW:
+		*class = CLASS_CODE_UDP_IPV4;
+		break;
+	case AH_V4_FLOW:
+	case ESP_V4_FLOW:
+		*class = CLASS_CODE_AH_ESP_IPV4;
+		break;
+	case SCTP_V4_FLOW:
+		*class = CLASS_CODE_SCTP_IPV4;
+		break;
+	case TCP_V6_FLOW:
+		*class = CLASS_CODE_TCP_IPV6;
+		break;
+	case UDP_V6_FLOW:
+		*class = CLASS_CODE_UDP_IPV6;
+		break;
+	case AH_V6_FLOW:
+	case ESP_V6_FLOW:
+		*class = CLASS_CODE_AH_ESP_IPV6;
+		break;
+	case SCTP_V6_FLOW:
+		*class = CLASS_CODE_SCTP_IPV6;
+		break;
+	default:
+		return 0;
+	}
+
+	return 1;
+}
+
+static void ethflow_to_filer_rules (struct gfar_private *priv, u64 ethflow)
+{
+	u32 fcr = 0x0, fpr = FPR_FILER_MASK;
+
+	if (ethflow & RXH_L2DA) {
+		fcr = RQFCR_PID_DAH |RQFCR_CMP_NOMATCH |
+			RQFCR_HASH | RQFCR_AND | RQFCR_HASHTBL_0;
+		ftp_rqfpr[priv->cur_filer_idx] = fpr;
+		ftp_rqfcr[priv->cur_filer_idx] = fcr;
+		gfar_write_filer(priv, priv->cur_filer_idx, fcr, fpr);
+		priv->cur_filer_idx = priv->cur_filer_idx - 1;
+
+		fcr = RQFCR_PID_DAL | RQFCR_AND | RQFCR_CMP_NOMATCH |
+				RQFCR_HASH | RQFCR_AND | RQFCR_HASHTBL_0;
+		ftp_rqfpr[priv->cur_filer_idx] = fpr;
+		ftp_rqfcr[priv->cur_filer_idx] = fcr;
+		gfar_write_filer(priv, priv->cur_filer_idx, fcr, fpr);
+		priv->cur_filer_idx = priv->cur_filer_idx - 1;
+	}
+
+	if (ethflow & RXH_VLAN) {
+		fcr = RQFCR_PID_VID | RQFCR_CMP_NOMATCH | RQFCR_HASH |
+				RQFCR_AND | RQFCR_HASHTBL_0;
+		gfar_write_filer(priv, priv->cur_filer_idx, fcr, fpr);
+		ftp_rqfpr[priv->cur_filer_idx] = fpr;
+		ftp_rqfcr[priv->cur_filer_idx] = fcr;
+		priv->cur_filer_idx = priv->cur_filer_idx - 1;
+	}
+
+	if (ethflow & RXH_IP_SRC) {
+		fcr = RQFCR_PID_SIA | RQFCR_CMP_NOMATCH | RQFCR_HASH |
+			RQFCR_AND | RQFCR_HASHTBL_0;
+		ftp_rqfpr[priv->cur_filer_idx] = fpr;
+		ftp_rqfcr[priv->cur_filer_idx] = fcr;
+		gfar_write_filer(priv, priv->cur_filer_idx, fcr, fpr);
+		priv->cur_filer_idx = priv->cur_filer_idx - 1;
+	}
+
+	if (ethflow & (RXH_IP_DST)) {
+		fcr = RQFCR_PID_DIA | RQFCR_CMP_NOMATCH | RQFCR_HASH |
+			RQFCR_AND | RQFCR_HASHTBL_0;
+		ftp_rqfpr[priv->cur_filer_idx] = fpr;
+		ftp_rqfcr[priv->cur_filer_idx] = fcr;
+		gfar_write_filer(priv, priv->cur_filer_idx, fcr, fpr);
+		priv->cur_filer_idx = priv->cur_filer_idx - 1;
+	}
+
+	if (ethflow & RXH_L3_PROTO) {
+		fcr = RQFCR_PID_L4P | RQFCR_CMP_NOMATCH | RQFCR_HASH |
+			RQFCR_AND | RQFCR_HASHTBL_0;
+		ftp_rqfpr[priv->cur_filer_idx] = fpr;
+		ftp_rqfcr[priv->cur_filer_idx] = fcr;
+		gfar_write_filer(priv, priv->cur_filer_idx, fcr, fpr);
+		priv->cur_filer_idx = priv->cur_filer_idx - 1;
+	}
+
+	if (ethflow & RXH_L4_B_0_1) {
+		fcr = RQFCR_PID_SPT | RQFCR_CMP_NOMATCH | RQFCR_HASH |
+			RQFCR_AND | RQFCR_HASHTBL_0;
+		ftp_rqfpr[priv->cur_filer_idx] = fpr;
+		ftp_rqfcr[priv->cur_filer_idx] = fcr;
+		gfar_write_filer(priv, priv->cur_filer_idx, fcr, fpr);
+		priv->cur_filer_idx = priv->cur_filer_idx - 1;
+	}
+
+	if (ethflow & RXH_L4_B_2_3) {
+		fcr = RQFCR_PID_DPT | RQFCR_CMP_NOMATCH | RQFCR_HASH |
+			RQFCR_AND | RQFCR_HASHTBL_0;
+		ftp_rqfpr[priv->cur_filer_idx] = fpr;
+		ftp_rqfcr[priv->cur_filer_idx] = fcr;
+		gfar_write_filer(priv, priv->cur_filer_idx, fcr, fpr);
+		priv->cur_filer_idx = priv->cur_filer_idx - 1;
+	}
+}
+
+static int gfar_ethflow_to_filer_table(struct gfar_private *priv, u64 ethflow, u64 class)
+{
+	unsigned int last_rule_idx = priv->cur_filer_idx;
+	unsigned int cmp_rqfpr;
+	unsigned int local_rqfpr[MAX_FILER_IDX + 1];
+	unsigned int local_rqfcr[MAX_FILER_IDX + 1];
+	int i = 0x0, k = 0x0;
+	int j = MAX_FILER_IDX, l = 0x0;
+
+	switch (class) {
+	case TCP_V4_FLOW:
+		cmp_rqfpr = RQFPR_IPV4 |RQFPR_TCP;
+		break;
+	case UDP_V4_FLOW:
+		cmp_rqfpr = RQFPR_IPV4 |RQFPR_UDP;
+		break;
+	case TCP_V6_FLOW:
+		cmp_rqfpr = RQFPR_IPV6 |RQFPR_TCP;
+		break;
+	case UDP_V6_FLOW:
+		cmp_rqfpr = RQFPR_IPV6 |RQFPR_UDP;
+		break;
+	case IPV4_FLOW:
+		cmp_rqfpr = RQFPR_IPV4;
+	case IPV6_FLOW:
+		cmp_rqfpr = RQFPR_IPV6;
+		break;
+	default:
+		printk(KERN_ERR "Right now this class is not supported\n");
+		return 0;
+	}
+
+	for (i = 0; i < MAX_FILER_IDX + 1; i++) {
+		local_rqfpr[j] = ftp_rqfpr[i];
+		local_rqfcr[j] = ftp_rqfcr[i];
+		j--;
+		if ((ftp_rqfcr[i] == (RQFCR_PID_PARSE |
+			RQFCR_CLE |RQFCR_AND)) &&
+			(ftp_rqfpr[i] == cmp_rqfpr))
+			break;
+	}
+
+	if (i == MAX_FILER_IDX + 1) {
+		printk(KERN_ERR "No parse rule found, ");
+		printk(KERN_ERR "can't create hash rules\n");
+		return 0;
+	}
+
+	/* If a match was found, then it begins the starting of a cluster rule
+	 * if it was already programmed, we need to overwrite these rules
+	 */
+	for (l = i+1; l < MAX_FILER_IDX; l++) {
+		if ((ftp_rqfcr[l] & RQFCR_CLE) &&
+			!(ftp_rqfcr[l] & RQFCR_AND)) {
+			ftp_rqfcr[l] = RQFCR_CLE | RQFCR_CMP_EXACT |
+				RQFCR_HASHTBL_0 | RQFCR_PID_MASK;
+			ftp_rqfpr[l] = FPR_FILER_MASK;
+			gfar_write_filer(priv, l, ftp_rqfcr[l], ftp_rqfpr[l]);
+			break;
+		}
+
+		if (!(ftp_rqfcr[l] & RQFCR_CLE) && (ftp_rqfcr[l] & RQFCR_AND))
+			continue;
+		else {
+			local_rqfpr[j] = ftp_rqfpr[l];
+			local_rqfcr[j] = ftp_rqfcr[l];
+			j--;
+		}
+	}
+
+	priv->cur_filer_idx = l - 1;
+	last_rule_idx = l;
+
+	/* hash rules */
+	ethflow_to_filer_rules(priv, ethflow);
+
+	/* Write back the popped out rules again */
+	for (k = j+1; k < MAX_FILER_IDX; k++) {
+		ftp_rqfpr[priv->cur_filer_idx] = local_rqfpr[k];
+		ftp_rqfcr[priv->cur_filer_idx] = local_rqfcr[k];
+		gfar_write_filer(priv, priv->cur_filer_idx,
+				local_rqfcr[k], local_rqfpr[k]);
+		if (!priv->cur_filer_idx)
+			break;
+		priv->cur_filer_idx = priv->cur_filer_idx - 1;
+	}
+
+	return 1;
+}
+
+static int gfar_set_hash_opts(struct gfar_private *priv, struct ethtool_rxnfc *cmd)
+{
+	u64 class;
+
+	if (!gfar_ethflow_to_class(cmd->flow_type, &class))
+		return -EINVAL;
+
+	if (class < CLASS_CODE_USER_PROG1 ||
+			class > CLASS_CODE_SCTP_IPV6)
+		return -EINVAL;
+
+	/* write the filer rules here */
+	if (!gfar_ethflow_to_filer_table(priv, cmd->data, cmd->flow_type))
+		return -1;
+
+	return 0;
+}
+
+static int gfar_set_nfc(struct net_device *dev, struct ethtool_rxnfc *cmd)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	int ret = 0;
+
+	switch(cmd->cmd) {
+	case ETHTOOL_SRXFH:
+		ret = gfar_set_hash_opts(priv, cmd);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
 const struct ethtool_ops gfar_ethtool_ops = {
 	.get_settings = gfar_gsettings,
 	.set_settings = gfar_ssettings,
@@ -670,4 +905,5 @@ const struct ethtool_ops gfar_ethtool_ops = {
 	.get_wol = gfar_get_wol,
 	.set_wol = gfar_set_wol,
 #endif
+	.set_rxnfc = gfar_set_nfc,
 };
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index eb1a48d..edd03b7 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -674,6 +674,8 @@ struct ethtool_ops {
 #define	AH_V6_FLOW	0x0b
 #define	ESP_V6_FLOW	0x0c
 #define	IP_USER_FLOW	0x0d
+#define IPV4_FLOW       0x10
+#define IPV6_FLOW       0x11
 
 /* L3-L4 network traffic flow hash options */
 #define	RXH_L2DA	(1 << 1)
-- 
1.5.6.5

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