diff options
Diffstat (limited to 'drivers/net/usb/smsc95xx.c')
| -rw-r--r-- | drivers/net/usb/smsc95xx.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c index d222d7e25273..73f9a31cf94d 100644 --- a/drivers/net/usb/smsc95xx.c +++ b/drivers/net/usb/smsc95xx.c | |||
| @@ -1189,9 +1189,21 @@ static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev, | |||
| 1189 | } | 1189 | } |
| 1190 | 1190 | ||
| 1191 | if (csum) { | 1191 | if (csum) { |
| 1192 | u32 csum_preamble = smsc95xx_calc_csum_preamble(skb); | 1192 | if (skb->len <= 45) { |
| 1193 | skb_push(skb, 4); | 1193 | /* workaround - hardware tx checksum does not work |
| 1194 | memcpy(skb->data, &csum_preamble, 4); | 1194 | * properly with extremely small packets */ |
| 1195 | long csstart = skb->csum_start - skb_headroom(skb); | ||
| 1196 | __wsum calc = csum_partial(skb->data + csstart, | ||
| 1197 | skb->len - csstart, 0); | ||
| 1198 | *((__sum16 *)(skb->data + csstart | ||
| 1199 | + skb->csum_offset)) = csum_fold(calc); | ||
| 1200 | |||
| 1201 | csum = false; | ||
| 1202 | } else { | ||
| 1203 | u32 csum_preamble = smsc95xx_calc_csum_preamble(skb); | ||
| 1204 | skb_push(skb, 4); | ||
| 1205 | memcpy(skb->data, &csum_preamble, 4); | ||
| 1206 | } | ||
| 1195 | } | 1207 | } |
| 1196 | 1208 | ||
| 1197 | skb_push(skb, 4); | 1209 | skb_push(skb, 4); |