[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1440614886-23566-2-git-send-email-isubramanian@apm.com>
Date: Wed, 26 Aug 2015 11:48:05 -0700
From: Iyappan Subramanian <isubramanian@....com>
To: davem@...emloft.net, netdev@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org, patches@....com,
Iyappan Subramanian <isubramanian@....com>
Subject: [PATCH v2 1/2] drivers: net: xgene: Preparatory patch for TSO support
- Rearranged descriptor writes
- Moved increment command write to xgene_enet_setup_tx_desc
Signed-off-by: Iyappan Subramanian <isubramanian@....com>
---
drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 29 ++++++++++++++++++------
drivers/net/ethernet/apm/xgene/xgene_enet_main.h | 1 +
2 files changed, 23 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
index 4f68d19..652b4c3 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
@@ -219,6 +219,11 @@ out:
return hopinfo;
}
+static u16 xgene_enet_encode_len(u16 len)
+{
+ return (len == BUFLEN_16K) ? 0 : len;
+}
+
static int xgene_enet_setup_tx_desc(struct xgene_enet_desc_ring *tx_ring,
struct sk_buff *skb)
{
@@ -227,27 +232,36 @@ static int xgene_enet_setup_tx_desc(struct xgene_enet_desc_ring *tx_ring,
dma_addr_t dma_addr;
u16 tail = tx_ring->tail;
u64 hopinfo;
+ u32 len, hw_len;
+ u8 count = 1;
raw_desc = &tx_ring->raw_desc[tail];
memset(raw_desc, 0, sizeof(struct xgene_enet_raw_desc));
- dma_addr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
+ len = skb_headlen(skb);
+ hw_len = xgene_enet_encode_len(len);
+
+ dma_addr = dma_map_single(dev, skb->data, len, DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma_addr)) {
netdev_err(tx_ring->ndev, "DMA mapping error\n");
return -EINVAL;
}
/* Hardware expects descriptor in little endian format */
- raw_desc->m0 = cpu_to_le64(tail);
raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) |
- SET_VAL(BUFDATALEN, skb->len) |
+ SET_VAL(BUFDATALEN, hw_len) |
SET_BIT(COHERENT));
+
+ raw_desc->m0 = cpu_to_le64(SET_VAL(USERINFO, tail));
hopinfo = xgene_enet_work_msg(skb);
raw_desc->m3 = cpu_to_le64(SET_VAL(HENQNUM, tx_ring->dst_ring_num) |
hopinfo);
tx_ring->cp_ring->cp_skb[tail] = skb;
- return 0;
+ tail = (tail + 1) & (tx_ring->slots - 1);
+ tx_ring->tail = tail;
+
+ return count;
}
static netdev_tx_t xgene_enet_start_xmit(struct sk_buff *skb,
@@ -257,6 +271,7 @@ static netdev_tx_t xgene_enet_start_xmit(struct sk_buff *skb,
struct xgene_enet_desc_ring *tx_ring = pdata->tx_ring;
struct xgene_enet_desc_ring *cp_ring = tx_ring->cp_ring;
u32 tx_level, cq_level;
+ int count;
tx_level = pdata->ring_ops->len(tx_ring);
cq_level = pdata->ring_ops->len(cp_ring);
@@ -266,14 +281,14 @@ static netdev_tx_t xgene_enet_start_xmit(struct sk_buff *skb,
return NETDEV_TX_BUSY;
}
- if (xgene_enet_setup_tx_desc(tx_ring, skb)) {
+ count = xgene_enet_setup_tx_desc(tx_ring, skb);
+ if (count <= 0) {
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
- pdata->ring_ops->wr_cmd(tx_ring, 1);
+ pdata->ring_ops->wr_cmd(tx_ring, count);
skb_tx_timestamp(skb);
- tx_ring->tail = (tx_ring->tail + 1) & (tx_ring->slots - 1);
pdata->stats.tx_packets++;
pdata->stats.tx_bytes += skb->len;
diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.h b/drivers/net/ethernet/apm/xgene/xgene_enet_main.h
index 1c85fc8..2ac547e 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.h
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.h
@@ -40,6 +40,7 @@
#define XGENE_DRV_VERSION "v1.0"
#define XGENE_ENET_MAX_MTU 1536
#define SKB_BUFFER_SIZE (XGENE_ENET_MAX_MTU - NET_IP_ALIGN)
+#define BUFLEN_16K (16 * 1024)
#define NUM_PKT_BUF 64
#define NUM_BUFPOOL 32
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists