The RXCHK block will return a partial checksum of 0 if it encounters a problem while receiving a packet. Since a 1's complement sum can only produce this result if no bits are set in the received data stream it is fair to treat it as an invalid partial checksum and not pass it up the stack.
Unified · Split
| @@ -2287,8 +2287,10 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_rx_ring *ring, · 2286 unmodified lines | ||
| 2287 | 2287 | dma_length_status = status->length_status; |
| 2288 | 2288 | if (dev->features & NETIF_F_RXCSUM) { |
| 2289 | 2289 | rx_csum = (__force __be16)(status->rx_csum & 0xffff); |
| 2290 | − skb->csum = (__force __wsum)ntohs(rx_csum); | |
| 2291 | − skb->ip_summed = CHECKSUM_COMPLETE; | |
| 2290 | + if (rx_csum) { | |
| 2291 | + skb->csum = (__force __wsum)ntohs(rx_csum); | |
| 2292 | + skb->ip_summed = CHECKSUM_COMPLETE; | |
| 2293 | + } | |
| 2292 | 2294 | } |
| 2293 | 2295 | |
| 2294 | 2296 | /* DMA flags and length are still valid no matter how |