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be2net: avoid unncessary swapping of fields in eth_tx_wrb

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The 32-bit fields of a tx-wrb are little endian. The driver is currently
using be_dws_le_to_cpu() routine to swap (cpu to le) all the fields of
a tx-wrb. So, the rsvd field is also unnecessarily swapped.

This patch fixes this by individually swapping the required fields.
Also, the type of the fields in eth_tx_wrb{} is now changed to __le32
from u32 to avoid sparse warnings.

Signed-off-by: Sathya Perla <sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sathya Perla 2015-02-06 08:18:43 -05:00 committed by David S. Miller
parent 21252377bb
commit f986afcbe0
2 changed files with 27 additions and 18 deletions
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10
drivers/net/ethernet/emulex/benet/be_hw.h
View File

@ -193,10 +193,10 @@ struct be_eq_entry {
/* TX Queue Descriptor */
#define ETH_WRB_FRAG_LEN_MASK 0xFFFF
struct be_eth_wrb {
u32 frag_pa_hi; /* dword 0 */
u32 frag_pa_lo; /* dword 1 */
u32 rsvd0; /* dword 2 */
u32 frag_len; /* dword 3: bits 0 - 15 */
__le32 frag_pa_hi; /* dword 0 */
__le32 frag_pa_lo; /* dword 1 */
u32 rsvd0; /* dword 2 */
__le32 frag_len; /* dword 3: bits 0 - 15 */
} __packed;
/* Pseudo amap definition for eth_hdr_wrb in which each bit of the
@ -229,7 +229,7 @@ struct amap_eth_hdr_wrb {
#define TX_HDR_WRB_NUM_MASK 0x1F /* word 2: bits 13:17 */
struct be_eth_hdr_wrb {
u32 dw[4];
__le32 dw[4];
};
/********* Tx Compl Status Encoding *********/

35
drivers/net/ethernet/emulex/benet/be_main.c
View File

@ -682,9 +682,20 @@ static u32 skb_wrb_cnt(struct sk_buff *skb)
static inline void wrb_fill(struct be_eth_wrb *wrb, u64 addr, int len)
{
wrb->frag_pa_hi = upper_32_bits(addr);
wrb->frag_pa_lo = addr & 0xFFFFFFFF;
wrb->frag_len = len & ETH_WRB_FRAG_LEN_MASK;
wrb->frag_pa_hi = cpu_to_le32(upper_32_bits(addr));
wrb->frag_pa_lo = cpu_to_le32(lower_32_bits(addr));
wrb->frag_len = cpu_to_le32(len & ETH_WRB_FRAG_LEN_MASK);
wrb->rsvd0 = 0;
}
/* A dummy wrb is just all zeros. Using a separate routine for dummy-wrb
* to avoid the swap and shift/mask operations in wrb_fill().
*/
static inline void wrb_fill_dummy(struct be_eth_wrb *wrb)
{
wrb->frag_pa_hi = 0;
wrb->frag_pa_lo = 0;
wrb->frag_len = 0;
wrb->rsvd0 = 0;
}
@ -765,16 +776,16 @@ static void unmap_tx_frag(struct device *dev, struct be_eth_wrb *wrb,
bool unmap_single)
{
dma_addr_t dma;
u32 frag_len = le32_to_cpu(wrb->frag_len);
be_dws_le_to_cpu(wrb, sizeof(*wrb));
dma = (u64)wrb->frag_pa_hi << 32 | (u64)wrb->frag_pa_lo;
if (wrb->frag_len) {
dma = (u64)le32_to_cpu(wrb->frag_pa_hi) << 32 |
(u64)le32_to_cpu(wrb->frag_pa_lo);
if (frag_len) {
if (unmap_single)
dma_unmap_single(dev, dma, wrb->frag_len,
DMA_TO_DEVICE);
dma_unmap_single(dev, dma, frag_len, DMA_TO_DEVICE);
else
dma_unmap_page(dev, dma, wrb->frag_len, DMA_TO_DEVICE);
dma_unmap_page(dev, dma, frag_len, DMA_TO_DEVICE);
}
}
@ -806,7 +817,6 @@ static u32 be_xmit_enqueue(struct be_adapter *adapter, struct be_tx_obj *txo,
map_single = true;
wrb = queue_head_node(txq);
wrb_fill(wrb, busaddr, len);
be_dws_cpu_to_le(wrb, sizeof(*wrb));
queue_head_inc(txq);
copied += len;
}
@ -820,7 +830,6 @@ static u32 be_xmit_enqueue(struct be_adapter *adapter, struct be_tx_obj *txo,
goto dma_err;
wrb = queue_head_node(txq);
wrb_fill(wrb, busaddr, skb_frag_size(frag));
be_dws_cpu_to_le(wrb, sizeof(*wrb));
queue_head_inc(txq);
copied += skb_frag_size(frag);
}
@ -846,7 +855,7 @@ dma_err:
wrb = queue_head_node(txq);
unmap_tx_frag(dev, wrb, map_single);
map_single = false;
copied -= wrb->frag_len;
copied -= le32_to_cpu(wrb->frag_len);
adapter->drv_stats.dma_map_errors++;
queue_head_inc(txq);
}
@ -1037,7 +1046,7 @@ static void be_xmit_flush(struct be_adapter *adapter, struct be_tx_obj *txo)
/* compose a dummy wrb if there are odd set of wrbs to notify */
if (!lancer_chip(adapter) && (txo->pend_wrb_cnt & 1)) {
wrb_fill(queue_head_node(txq), 0, 0);
wrb_fill_dummy(queue_head_node(txq));
queue_head_inc(txq);
atomic_inc(&txq->used);
txo->pend_wrb_cnt++;