From f986afcbe05f507e4520cf0e92bdb56637a3e6c1 Mon Sep 17 00:00:00 2001 From: Sathya Perla Date: Fri, 6 Feb 2015 08:18:43 -0500 Subject: [PATCH] be2net: avoid unncessary swapping of fields in eth_tx_wrb 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 Signed-off-by: David S. Miller --- drivers/net/ethernet/emulex/benet/be_hw.h | 10 +++--- drivers/net/ethernet/emulex/benet/be_main.c | 35 +++++++++++++-------- 2 files changed, 27 insertions(+), 18 deletions(-) diff --git a/drivers/net/ethernet/emulex/benet/be_hw.h b/drivers/net/ethernet/emulex/benet/be_hw.h index a8593aa46359..48840889db62 100644 --- a/drivers/net/ethernet/emulex/benet/be_hw.h +++ b/drivers/net/ethernet/emulex/benet/be_hw.h @@ -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 *********/ diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c index 195d357e2f3f..932b93a14965 100644 --- a/drivers/net/ethernet/emulex/benet/be_main.c +++ b/drivers/net/ethernet/emulex/benet/be_main.c @@ -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++; -- 2.34.1