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Message-ID: <1488334402-13557-1-git-send-email-hassan.naveed@imgtec.com>
Date: Tue, 28 Feb 2017 18:13:22 -0800
From: Hassan Naveed <hassan.naveed@...tec.com>
To: <netdev@...r.kernel.org>
CC: Hassan Naveed <hassan.naveed@...tec.com>,
Paul Burton <paul.burton@...tec.com>,
Matt Redfearn <matt.redfearn@...tec.com>,
"David S. Miller" <davem@...emloft.net>,
Florian Westphal <fw@...len.de>,
françois romieu <romieu@...zoreil.com>
Subject: [PATCH v2] net: pch_gbe: Fix TX RX descriptor accesses for big endian systems
Fix pch_gbe driver for ethernet operations for a big endian CPU.
Values written to and read from transmit and receive descriptors
in the pch_gbe driver are byte swapped from the perspective of a
big endian CPU, since the ethernet controller always operates in
little endian mode. Rectify this by appropriately byte swapping
these descriptor field values in the driver software.
Signed-off-by: Hassan Naveed <hassan.naveed@...tec.com>
Reviewed-by: Paul Burton <paul.burton@...tec.com>
Reviewed-by: Matt Redfearn <matt.redfearn@...tec.com>
Cc: Paul Burton <paul.burton@...tec.com>
Cc: Matt Redfearn <matt.redfearn@...tec.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: Florian Westphal <fw@...len.de>
Cc: françois romieu <romieu@...zoreil.com>
---
Changes in v2: Additionally changed transmit and receive descriptors field
types to __le{16,32}. Ran sparse with endianness checking enabled and no
new warnings were generated.
drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.h | 22 ++++----
.../net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c | 66 ++++++++++++----------
2 files changed, 46 insertions(+), 42 deletions(-)
diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.h b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.h
index de1dd08..e279eb2 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.h
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.h
@@ -431,13 +431,13 @@ struct pch_gbe_hw {
* @reserved2: Reserved
*/
struct pch_gbe_rx_desc {
- u32 buffer_addr;
- u32 tcp_ip_status;
- u16 rx_words_eob;
- u16 gbec_status;
+ __le32 buffer_addr;
+ __le32 tcp_ip_status;
+ __le16 rx_words_eob;
+ __le16 gbec_status;
u8 dma_status;
u8 reserved1;
- u16 reserved2;
+ __le16 reserved2;
};
/**
@@ -452,14 +452,14 @@ struct pch_gbe_rx_desc {
* @gbec_status: GMAC Status
*/
struct pch_gbe_tx_desc {
- u32 buffer_addr;
- u16 length;
- u16 reserved1;
- u16 tx_words_eob;
- u16 tx_frame_ctrl;
+ __le32 buffer_addr;
+ __le16 length;
+ __le16 reserved1;
+ __le16 tx_words_eob;
+ __le16 tx_frame_ctrl;
u8 dma_status;
u8 reserved2;
- u16 gbec_status;
+ __le16 gbec_status;
};
diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
index d1048dd..6937169 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
@@ -1250,11 +1250,11 @@ static void pch_gbe_tx_queue(struct pch_gbe_adapter *adapter,
/*-- Set Tx descriptor --*/
tx_desc = PCH_GBE_TX_DESC(*tx_ring, ring_num);
- tx_desc->buffer_addr = (buffer_info->dma);
- tx_desc->length = skb->len;
- tx_desc->tx_words_eob = skb->len + 3;
- tx_desc->tx_frame_ctrl = (frame_ctrl);
- tx_desc->gbec_status = (DSC_INIT16);
+ tx_desc->buffer_addr = cpu_to_le32(buffer_info->dma);
+ tx_desc->length = cpu_to_le16(skb->len);
+ tx_desc->tx_words_eob = cpu_to_le16(skb->len + 3);
+ tx_desc->tx_frame_ctrl = cpu_to_le16(frame_ctrl);
+ tx_desc->gbec_status = cpu_to_le16(DSC_INIT16);
if (unlikely(++ring_num == tx_ring->count))
ring_num = 0;
@@ -1460,8 +1460,8 @@ static irqreturn_t pch_gbe_intr(int irq, void *data)
}
buffer_info->mapped = true;
rx_desc = PCH_GBE_RX_DESC(*rx_ring, i);
- rx_desc->buffer_addr = (buffer_info->dma);
- rx_desc->gbec_status = DSC_INIT16;
+ rx_desc->buffer_addr = cpu_to_le32(buffer_info->dma);
+ rx_desc->gbec_status = cpu_to_le16(DSC_INIT16);
netdev_dbg(netdev,
"i = %d buffer_info->dma = 0x08%llx buffer_info->length = 0x%x\n",
@@ -1533,7 +1533,7 @@ static void pch_gbe_alloc_tx_buffers(struct pch_gbe_adapter *adapter,
skb_reserve(skb, PCH_GBE_DMA_ALIGN);
buffer_info->skb = skb;
tx_desc = PCH_GBE_TX_DESC(*tx_ring, i);
- tx_desc->gbec_status = (DSC_INIT16);
+ tx_desc->gbec_status = cpu_to_le16(DSC_INIT16);
}
return;
}
@@ -1564,11 +1564,12 @@ static void pch_gbe_alloc_tx_buffers(struct pch_gbe_adapter *adapter,
i = tx_ring->next_to_clean;
tx_desc = PCH_GBE_TX_DESC(*tx_ring, i);
netdev_dbg(adapter->netdev, "gbec_status:0x%04x dma_status:0x%04x\n",
- tx_desc->gbec_status, tx_desc->dma_status);
+ le16_to_cpu(tx_desc->gbec_status), tx_desc->dma_status);
unused = PCH_GBE_DESC_UNUSED(tx_ring);
thresh = tx_ring->count - PCH_GBE_TX_WEIGHT;
- if ((tx_desc->gbec_status == DSC_INIT16) && (unused < thresh))
+ if ((le16_to_cpu(tx_desc->gbec_status) == DSC_INIT16) &&
+ (unused < thresh))
{ /* current marked clean, tx queue filling up, do extra clean */
int j, k;
if (unused < 8) { /* tx queue nearly full */
@@ -1583,47 +1584,49 @@ static void pch_gbe_alloc_tx_buffers(struct pch_gbe_adapter *adapter,
for (j = 0; j < PCH_GBE_TX_WEIGHT; j++)
{
tx_desc = PCH_GBE_TX_DESC(*tx_ring, k);
- if (tx_desc->gbec_status != DSC_INIT16) break; /*found*/
+ if (le16_to_cpu(tx_desc->gbec_status) != DSC_INIT16)
+ break; /*found*/
if (++k >= tx_ring->count) k = 0; /*increment, wrap*/
}
if (j < PCH_GBE_TX_WEIGHT) {
netdev_dbg(adapter->netdev,
"clean_tx: unused=%d loops=%d found tx_desc[%x,%x:%x].gbec_status=%04x\n",
unused, j, i, k, tx_ring->next_to_use,
- tx_desc->gbec_status);
+ le16_to_cpu(tx_desc->gbec_status));
i = k; /*found one to clean, usu gbec_status==2000.*/
}
}
- while ((tx_desc->gbec_status & DSC_INIT16) == 0x0000) {
+ while ((cpu_to_le16(tx_desc->gbec_status) & DSC_INIT16) == 0x0000) {
netdev_dbg(adapter->netdev, "gbec_status:0x%04x\n",
- tx_desc->gbec_status);
+ le16_to_cpu(tx_desc->gbec_status));
buffer_info = &tx_ring->buffer_info[i];
skb = buffer_info->skb;
cleaned = true;
- if ((tx_desc->gbec_status & PCH_GBE_TXD_GMAC_STAT_ABT)) {
+ if ((le16_to_cpu(tx_desc->gbec_status) &
+ PCH_GBE_TXD_GMAC_STAT_ABT)) {
adapter->stats.tx_aborted_errors++;
netdev_err(adapter->netdev, "Transfer Abort Error\n");
- } else if ((tx_desc->gbec_status & PCH_GBE_TXD_GMAC_STAT_CRSER)
- ) {
+ } else if ((le16_to_cpu(tx_desc->gbec_status) &
+ PCH_GBE_TXD_GMAC_STAT_CRSER)) {
adapter->stats.tx_carrier_errors++;
netdev_err(adapter->netdev,
"Transfer Carrier Sense Error\n");
- } else if ((tx_desc->gbec_status & PCH_GBE_TXD_GMAC_STAT_EXCOL)
- ) {
+ } else if ((le16_to_cpu(tx_desc->gbec_status) &
+ PCH_GBE_TXD_GMAC_STAT_EXCOL)) {
adapter->stats.tx_aborted_errors++;
netdev_err(adapter->netdev,
"Transfer Collision Abort Error\n");
- } else if ((tx_desc->gbec_status &
+ } else if ((le16_to_cpu(tx_desc->gbec_status) &
(PCH_GBE_TXD_GMAC_STAT_SNGCOL |
PCH_GBE_TXD_GMAC_STAT_MLTCOL))) {
adapter->stats.collisions++;
adapter->stats.tx_packets++;
adapter->stats.tx_bytes += skb->len;
netdev_dbg(adapter->netdev, "Transfer Collision\n");
- } else if ((tx_desc->gbec_status & PCH_GBE_TXD_GMAC_STAT_CMPLT)
- ) {
+ } else if ((le16_to_cpu(tx_desc->gbec_status) &
+ PCH_GBE_TXD_GMAC_STAT_CMPLT)) {
adapter->stats.tx_packets++;
adapter->stats.tx_bytes += skb->len;
}
@@ -1639,7 +1642,7 @@ static void pch_gbe_alloc_tx_buffers(struct pch_gbe_adapter *adapter,
"trim buffer_info->skb : %d\n", i);
skb_trim(buffer_info->skb, 0);
}
- tx_desc->gbec_status = DSC_INIT16;
+ tx_desc->gbec_status = cpu_to_le16(DSC_INIT16);
if (unlikely(++i == tx_ring->count))
i = 0;
tx_desc = PCH_GBE_TX_DESC(*tx_ring, i);
@@ -1705,15 +1708,15 @@ static void pch_gbe_alloc_tx_buffers(struct pch_gbe_adapter *adapter,
while (*work_done < work_to_do) {
/* Check Rx descriptor status */
rx_desc = PCH_GBE_RX_DESC(*rx_ring, i);
- if (rx_desc->gbec_status == DSC_INIT16)
+ if (le16_to_cpu(rx_desc->gbec_status) == DSC_INIT16)
break;
cleaned = true;
cleaned_count++;
dma_status = rx_desc->dma_status;
- gbec_status = rx_desc->gbec_status;
- tcp_ip_status = rx_desc->tcp_ip_status;
- rx_desc->gbec_status = DSC_INIT16;
+ gbec_status = le16_to_cpu(rx_desc->gbec_status);
+ tcp_ip_status = le32_to_cpu(rx_desc->tcp_ip_status);
+ rx_desc->gbec_status = cpu_to_le16(DSC_INIT16);
buffer_info = &rx_ring->buffer_info[i];
skb = buffer_info->skb;
buffer_info->skb = NULL;
@@ -1742,8 +1745,9 @@ static void pch_gbe_alloc_tx_buffers(struct pch_gbe_adapter *adapter,
} else {
/* get receive length */
/* length convert[-3], length includes FCS length */
- length = (rx_desc->rx_words_eob) - 3 - ETH_FCS_LEN;
- if (rx_desc->rx_words_eob & 0x02)
+ length = le16_to_cpu(rx_desc->rx_words_eob) - 3 -
+ ETH_FCS_LEN;
+ if (le16_to_cpu(rx_desc->rx_words_eob) & 0x02)
length = length - 4;
/*
* buffer_info->rx_buffer: [Header:14][payload]
@@ -1823,7 +1827,7 @@ int pch_gbe_setup_tx_resources(struct pch_gbe_adapter *adapter,
for (desNo = 0; desNo < tx_ring->count; desNo++) {
tx_desc = PCH_GBE_TX_DESC(*tx_ring, desNo);
- tx_desc->gbec_status = DSC_INIT16;
+ tx_desc->gbec_status = cpu_to_le16(DSC_INIT16);
}
netdev_dbg(adapter->netdev,
"tx_ring->desc = 0x%p tx_ring->dma = 0x%08llx next_to_clean = 0x%08x next_to_use = 0x%08x\n",
@@ -1864,7 +1868,7 @@ int pch_gbe_setup_rx_resources(struct pch_gbe_adapter *adapter,
rx_ring->next_to_use = 0;
for (desNo = 0; desNo < rx_ring->count; desNo++) {
rx_desc = PCH_GBE_RX_DESC(*rx_ring, desNo);
- rx_desc->gbec_status = DSC_INIT16;
+ rx_desc->gbec_status = cpu_to_le16(DSC_INIT16);
}
netdev_dbg(adapter->netdev,
"rx_ring->desc = 0x%p rx_ring->dma = 0x%08llx next_to_clean = 0x%08x next_to_use = 0x%08x\n",
--
1.9.1
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