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Subject[net-next PATCH v3 3/4] net: macb: Add support for jumbo frames
Date
Enable jumbo frame support for Zynq Ultrascale+ MPSoC.
Update the NWCFG register and descriptor length masks accordingly.
Jumbo max length register should be set according to support in SoC; it is
set to 10240 for Zynq Ultrascale+ MPSoC.

Signed-off-by: Harini Katakam <harinik@xilinx.com>
Reviewed-by: Punnaiah Choudary Kalluri <punnaia@xilinx.com>
---

v3:
Use macb_config for declaring jumbo capability and max size.

v2:
Add constant definition and update SoC name

---
drivers/net/ethernet/cadence/macb.c | 22 ++++++++++++++++++----
drivers/net/ethernet/cadence/macb.h | 9 +++++++++
2 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index bbe5656..cb84587 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -782,7 +782,7 @@ static int gem_rx(struct macb *bp, int budget)
}
/* now everything is ready for receiving packet */
bp->rx_skbuff[entry] = NULL;
- len = MACB_BFEXT(RX_FRMLEN, ctrl);
+ len = ctrl & bp->rx_frm_len_mask;

netdev_vdbg(bp->dev, "gem_rx %u (len %u)\n", entry, len);

@@ -828,7 +828,7 @@ static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
struct macb_dma_desc *desc;

desc = macb_rx_desc(bp, last_frag);
- len = MACB_BFEXT(RX_FRMLEN, desc->ctrl);
+ len = desc->ctrl & bp->rx_frm_len_mask;

netdev_vdbg(bp->dev, "macb_rx_frame frags %u - %u (len %u)\n",
macb_rx_ring_wrap(first_frag),
@@ -1633,7 +1633,10 @@ static void macb_init_hw(struct macb *bp)
config |= MACB_BF(RBOF, NET_IP_ALIGN); /* Make eth data aligned */
config |= MACB_BIT(PAE); /* PAuse Enable */
config |= MACB_BIT(DRFCS); /* Discard Rx FCS */
- config |= MACB_BIT(BIG); /* Receive oversized frames */
+ if (bp->caps | MACB_CAPS_JUMBO)
+ config |= MACB_BIT(JFRAME); /* Enable jumbo frames */
+ else
+ config |= MACB_BIT(BIG); /* Receive oversized frames */
if (bp->dev->flags & IFF_PROMISC)
config |= MACB_BIT(CAF); /* Copy All Frames */
else if (macb_is_gem(bp) && bp->dev->features & NETIF_F_RXCSUM)
@@ -1642,8 +1645,13 @@ static void macb_init_hw(struct macb *bp)
config |= MACB_BIT(NBC); /* No BroadCast */
config |= macb_dbw(bp);
macb_writel(bp, NCFGR, config);
+ if ((bp->caps | MACB_CAPS_JUMBO) && bp->jumbo_max_len)
+ gem_writel(bp, JML, bp->jumbo_max_len);
bp->speed = SPEED_10;
bp->duplex = DUPLEX_HALF;
+ bp->rx_frm_len_mask = MACB_RX_FRMLEN_MASK;
+ if (bp->caps | MACB_CAPS_JUMBO)
+ bp->rx_frm_len_mask = MACB_RX_JFRMLEN_MASK;

macb_configure_dma(bp);

@@ -2685,10 +2693,12 @@ static const struct macb_config emac_config = {
};

static const struct macb_config zynqmp_config = {
- .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE,
+ .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE |
+ MACB_CAPS_JUMBO,
.dma_burst_length = 16,
.clk_init = macb_clk_init,
.init = macb_init,
+ .jumbo_max_len = 10240,
};

static const struct of_device_id macb_dt_ids[] = {
@@ -2770,6 +2780,10 @@ static int macb_probe(struct platform_device *pdev)
bp->pclk = pclk;
bp->hclk = hclk;
bp->tx_clk = tx_clk;
+ if (macb_config->jumbo_max_len) {
+ bp->jumbo_max_len = macb_config->jumbo_max_len;
+ }
+
spin_lock_init(&bp->lock);

/* setup capabilities */
diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
index eb7d76f..7d4ef51 100644
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h
@@ -71,6 +71,7 @@
#define GEM_NCFGR 0x0004 /* Network Config */
#define GEM_USRIO 0x000c /* User IO */
#define GEM_DMACFG 0x0010 /* DMA Configuration */
+#define GEM_JML 0x0048 /* Jumbo Max Length */
#define GEM_HRB 0x0080 /* Hash Bottom */
#define GEM_HRT 0x0084 /* Hash Top */
#define GEM_SA1B 0x0088 /* Specific1 Bottom */
@@ -397,6 +398,7 @@
#define MACB_CAPS_GIGABIT_MODE_AVAILABLE 0x20000000
#define MACB_CAPS_SG_DISABLED 0x40000000
#define MACB_CAPS_MACB_IS_GEM 0x80000000
+#define MACB_CAPS_JUMBO 0x00000008

/* Bit manipulation macros */
#define MACB_BIT(name) \
@@ -514,6 +516,9 @@ struct macb_dma_desc {
#define MACB_RX_BROADCAST_OFFSET 31
#define MACB_RX_BROADCAST_SIZE 1

+#define MACB_RX_FRMLEN_MASK 0xFFF
+#define MACB_RX_JFRMLEN_MASK 0x3FFF
+
/* RX checksum offload disabled: bit 24 clear in NCFGR */
#define GEM_RX_TYPEID_MATCH_OFFSET 22
#define GEM_RX_TYPEID_MATCH_SIZE 2
@@ -757,6 +762,7 @@ struct macb_config {
int (*clk_init)(struct platform_device *pdev, struct clk **pclk,
struct clk **hclk, struct clk **tx_clk);
int (*init)(struct platform_device *pdev);
+ int jumbo_max_len;
};

struct macb_queue {
@@ -826,6 +832,9 @@ struct macb {
unsigned int max_tx_length;

u64 ethtool_stats[GEM_STATS_LEN];
+
+ unsigned int rx_frm_len_mask;
+ unsigned int jumbo_max_len;
};

static inline bool macb_is_gem(struct macb *bp)
--
1.7.9.5


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