Split this function in two new ones:
- cdc_ncm_ndp16_find: finds an NDP block in the chain mathcing a supplied
signature; a pointer to it is returned in case of success;
- cdc_ncm_ndp16_push: create and add to skb a new NDP block;
cdc_ncm_ndp16_push refers to the last NDP visited by cdc_ncm_ndp16_find, hence
this code is stateful.
Signed-Off-By: Enrico Mioso <mrkiko...@gmail.com>
---
drivers/net/usb/cdc_ncm.c | 30 +++++++++++++++++++++---------
1 file changed, 21 insertions(+), 9 deletions(-)
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index 8067b8f..3c837d6 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -980,7 +980,7 @@ static void cdc_ncm_align_tail(struct sk_buff *skb, size_t
modulus, size_t remai
/* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
* allocating a new one within skb
*/
-static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct
sk_buff *skb, __le32 sign, size_t reserve)
+static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp16_find(struct cdc_ncm_ctx *ctx,
struct sk_buff *skb, __le32 sign)
{
struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
@@ -988,12 +988,20 @@ static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct
cdc_ncm_ctx *ctx, struct sk_
/* follow the chain of NDPs, looking for a match */
while (ndpoffset) {
- ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
- if (ndp16->dwSignature == sign)
- return ndp16;
+ ctx->tx_curr_ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data +
ndpoffset);
+ if (ctx->tx_curr_ndp16->dwSignature == sign)
+ ndp16 = ctx->tx_curr_ndp16;
ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
}
+
+ return ndp16;
+}
+static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp16_push(struct cdc_ncm_ctx *ctx,
struct sk_buff *skb, __le32 sign, size_t reserve)
+{
+ struct usb_cdc_ncm_ndp16 *ndp16 = ctx->tx_curr_ndp16;
+ struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
+
/* align new NDP */
cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max);
@@ -1070,11 +1078,15 @@ cdc_ncm_fill_tx_frame(struct usbnet *dev, struct
sk_buff *skb, __le32 sign)
break;
}
- /* get the appropriate NDP for this skb */
- ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len +
ctx->tx_modulus + ctx->tx_remainder);
-
- /* align beginning of next frame */
- cdc_ncm_align_tail(skb_out, ctx->tx_modulus,
ctx->tx_remainder, ctx->tx_max);
+ /* search for the appropriate NDP for this skb */
+ ndp16 = cdc_ncm_ndp16_find(ctx, skb_out, sign);
+
+ if (ndp16 == NULL)
+ {
+ ndp16 = cdc_ncm_ndp16_push(ctx, skb_out, sign, skb->len +
ctx->tx_modulus + ctx->tx_remainder);
+ }
+ else
+ cdc_ncm_align_tail(skb_out, ctx->tx_modulus,
ctx->tx_remainder, ctx->tx_max);
/* check if we had enough room left for both NDP and frame */
if (!ndp16 || skb_out->len + skb->len > ctx->tx_max) {
--
2.4.2
--
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