|
Lines 1843-1856
Link Here
|
| 1843 |
} |
1843 |
} |
| 1844 |
|
1844 |
|
| 1845 |
/* |
1845 |
/* |
| 1846 |
* If the parent interface can do LRO and checksum offloading on |
1846 |
* If the parent interface is not a bridge and can do LRO and |
| 1847 |
* VLANs, then guess it may do LRO on VLANs. False positive here |
1847 |
* checksum offloading on VLANs, then guess it may do LRO on VLANs. |
| 1848 |
* cost nothing, while false negative may lead to some confusions. |
1848 |
* False positive here cost nothing, while false negative may lead |
|
|
1849 |
* to some confusions. According to Wikipedia: |
| 1850 |
* |
| 1851 |
* "LRO should not operate on machines acting as routers, as it breaks |
| 1852 |
* the end-to-end principle and can significantly impact performance." |
| 1853 |
* |
| 1854 |
* The same reasoning applies to machines acting as bridges. |
| 1849 |
*/ |
1855 |
*/ |
| 1850 |
if (p->if_capabilities & IFCAP_VLAN_HWCSUM) |
1856 |
if (ifp->if_bridge == NULL) { |
| 1851 |
cap |= p->if_capabilities & IFCAP_LRO; |
1857 |
if (p->if_capabilities & IFCAP_VLAN_HWCSUM) |
| 1852 |
if (p->if_capenable & IFCAP_VLAN_HWCSUM) |
1858 |
cap |= p->if_capabilities & IFCAP_LRO; |
| 1853 |
ena |= p->if_capenable & IFCAP_LRO; |
1859 |
if (p->if_capenable & IFCAP_VLAN_HWCSUM) |
|
|
1860 |
ena |= p->if_capenable & IFCAP_LRO; |
| 1861 |
} |
| 1854 |
|
1862 |
|
| 1855 |
/* |
1863 |
/* |
| 1856 |
* If the parent interface can offload TCP connections over VLANs then |
1864 |
* If the parent interface can offload TCP connections over VLANs then |