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- Use BUS_DMASYNC_PREWRITE in em_get_buf(), as the adapter is about to read

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the descriptors set.
- In em_process_receive_interrupts(), call bus_dmamap_sync() for the
descriptors set each time we modify one descriptor, instead of doing it only
at the function exit, to make sure the adapters know he can re-use the
descriptor.
This helps on arm with write-back data cache (and possibly on other arches
with bounce pages, I don't know) under heavy network load. Without this,
if we attempt to process more than num_rx_desc descriptors, the adapter
would just stop processing rx interrupts.
This commit is contained in:
Olivier Houchard 2005-10-18 00:42:10 +00:00
parent 7c799f4520
commit 60d41c425b
1 changed files with 4 additions and 3 deletions
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7
sys/dev/em/if_em.c
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@ -2493,7 +2493,8 @@ em_get_buf(int i, struct adapter *adapter,
}
rx_buffer->m_head = mp;
adapter->rx_desc_base[i].buffer_addr = htole64(paddr);
bus_dmamap_sync(adapter->rxtag, rx_buffer->map, BUS_DMASYNC_PREREAD);
bus_dmamap_sync(adapter->rxtag, rx_buffer->map, BUS_DMASYNC_PREREAD |
BUS_DMASYNC_PREWRITE);
return(0);
}
@ -2863,6 +2864,8 @@ em_process_receive_interrupts(struct adapter * adapter, int count)
/* Zero out the receive descriptors status */
current_desc->status = 0;
bus_dmamap_sync(adapter->rxdma.dma_tag, adapter->rxdma.dma_map,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
/* Advance the E1000's Receive Queue #0 "Tail Pointer". */
E1000_WRITE_REG(&adapter->hw, RDT, i);
@ -2879,8 +2882,6 @@ em_process_receive_interrupts(struct adapter * adapter, int count)
}
current_desc = &adapter->rx_desc_base[i];
}
bus_dmamap_sync(adapter->rxdma.dma_tag, adapter->rxdma.dma_map,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
adapter->next_rx_desc_to_check = i;
return;
}