Hi,
On Fri, Nov 12, 2010 at 07:52:05AM -0800, Guy, Wey-Yi wrote:
> On Thu, 2010-11-11 at 23:47 -0800, Stanislaw Gruszka wrote:
> > We can simplify length calculation in iwlagn_tx_skb, that function
> > is enough complex, without fuzz it more than necessary.
> >
> > Signed-off-by: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
> > ---
> > drivers/net/wireless/iwlwifi/iwl-agn-tx.c | 33 ++++++++++------------------
> > 1 files changed, 12 insertions(+), 21 deletions(-)
> >
> > diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
> > index 2b078a9..1205cec 100644
> > --- a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
> > +++ b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
> > @@ -522,7 +522,7 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
> > dma_addr_t phys_addr;
> > dma_addr_t txcmd_phys;
> > dma_addr_t scratch_phys;
> > - u16 len, len_org, firstlen, secondlen;
> > + u16 len, firstlen, secondlen;
> > u16 seq_number = 0;
> > __le16 fc;
> > u8 hdr_len;
> > @@ -687,30 +687,23 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
> > */
> > len = sizeof(struct iwl_tx_cmd) +
> > sizeof(struct iwl_cmd_header) + hdr_len;
> > -
> > - len_org = len;
> > - firstlen = len = (len + 3) & ~3;
> > -
> > - if (len_org != len)
> > - len_org = 1;
> > - else
> > - len_org = 0;
> > + firstlen = (len + 3) & ~3;
> >
> > /* Tell NIC about any 2-byte padding after MAC header */
> > - if (len_org)
> > + if (firstlen != len)
> > tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK;
> >
> > /* Physical address of this Tx command's header (not MAC header!),
> > * within command buffer array. */
> > txcmd_phys = pci_map_single(priv->pci_dev,
> > - &out_cmd->hdr, len,
> > + &out_cmd->hdr, firstlen,
> > PCI_DMA_BIDIRECTIONAL);
> > dma_unmap_addr_set(out_meta, mapping, txcmd_phys);
> > - dma_unmap_len_set(out_meta, len, len);
> > + dma_unmap_len_set(out_meta, len, firstlen);
>
> it is possible len != firstlen, right?
Yes it is, firstlen is aligned up to 4 byes value, txcmd_phys dma map
size is firstlen and in consequence I use it every time with txcmd_phys.
> > /* Add buffer containing Tx command and MAC(!) header to TFD's
> > * first entry */
> > priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
> > - txcmd_phys, len, 1, 0);
> > + txcmd_phys, firstlen, 1, 0);
> >
> > if (!ieee80211_has_morefrags(hdr->frame_control)) {
> > txq->need_update = 1;
> > @@ -721,23 +714,21 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
> >
> > /* Set up TFD's 2nd entry to point directly to remainder of skb,
> > * if any (802.11 null frames have no payload). */
> > - secondlen = len = skb->len - hdr_len;
> > - if (len) {
> > + secondlen = skb->len - hdr_len;
> > + if (secondlen > 0) {
> > phys_addr = pci_map_single(priv->pci_dev, skb->data + hdr_len,
> > - len, PCI_DMA_TODEVICE);
> > + secondlen, PCI_DMA_TODEVICE);
> > priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
> > - phys_addr, len,
> > + phys_addr, secondlen,
> > 0, 0);
> > }
> >
> > scratch_phys = txcmd_phys + sizeof(struct iwl_cmd_header) +
> > offsetof(struct iwl_tx_cmd, scratch);
> >
> > - len = sizeof(struct iwl_tx_cmd) +
> > - sizeof(struct iwl_cmd_header) + hdr_len;
> > /* take back ownership of DMA buffer to enable update */
> > pci_dma_sync_single_for_cpu(priv->pci_dev, txcmd_phys,
> > - len, PCI_DMA_BIDIRECTIONAL);
> > + firstlen, PCI_DMA_BIDIRECTIONAL);
>
> same here, "firstlen" not necessary equal "len"
I guess its enough to sync just "len" but I prefer to use the
size we used to map dma.
Stanislaw
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