networking:napi
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networking:napi [2016/10/06 06:47] shirai some tiny fixes related to wiki syntax |
networking:napi [2016/11/14 21:59] jwi |
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| * Only one CPU at any time can call napi->poll(); for each ''napi_struct'' this is because only one CPU can pick the initial interrupt and hence the initial //napi_schedule(napi)// | * Only one CPU at any time can call napi->poll(); for each ''napi_struct'' this is because only one CPU can pick the initial interrupt and hence the initial //napi_schedule(napi)// | ||
| - | * The core layer invokes devices to send packets in a round robin format. This implies receive is totaly lockless because of the guarantee only that one CPU is executing it. | + | * The core layer invokes devices to send packets in a round robin format. This implies receive is totaly lockless because of the guarantee that only one CPU is executing it. |
| * Contention can only be the result of some other CPU accessing the rx ring. This happens only in close() and suspend() (when these methods try to clean the rx ring); Driver authors need not worry about this; synchronization is taken care for them by the top net layer. | * Contention can only be the result of some other CPU accessing the rx ring. This happens only in close() and suspend() (when these methods try to clean the rx ring); Driver authors need not worry about this; synchronization is taken care for them by the top net layer. | ||
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| * puts ''napi'' in a state ready to be added to the CPU polling list if it is up and running. You can look at this as the first half of //napi_schedule(napi)//. | * puts ''napi'' in a state ready to be added to the CPU polling list if it is up and running. You can look at this as the first half of //napi_schedule(napi)//. | ||
| * **<nowiki>__napi_schedule(napi)</nowiki>** | * **<nowiki>__napi_schedule(napi)</nowiki>** | ||
| - | * Add ''napi'' to the poll list for this CPU; assuming that //napi_prep(napi)// has already been called and returned 1 | + | * Add ''napi'' to the poll list for this CPU; assuming that //napi_schedule_prep(napi)// has already been called and returned 1 |
| * **napi_reschedule(napi) ** | * **napi_reschedule(napi) ** | ||
| * Called to reschedule polling for ''napi'' specifically for some deficient hardware. | * Called to reschedule polling for ''napi'' specifically for some deficient hardware. | ||
networking/napi.txt · Last modified: 2022/10/16 16:55 by joser93
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