diff options
| author | Alexander Lobakin <alexandr.lobakin@intel.com> | 2021-11-23 20:18:32 +0300 |
|---|---|---|
| committer | Tony Nguyen <anthony.l.nguyen@intel.com> | 2021-12-28 20:41:57 +0300 |
| commit | dcb95f06eab84bb3283273a63af8f930bf27c9d7 (patch) | |
| tree | 51a83e51da5e8edd9ac8ae6123d6b8d818117b01 /drivers/net/ethernet/intel | |
| parent | 0f1eae8e565e632f64670a5730894f22819fcaad (diff) | |
| download | linux-dcb95f06eab84bb3283273a63af8f930bf27c9d7.tar.xz | |
e1000: switch to napi_consume_skb()
In order to take the best from per-cpu NAPI skbuff_head caches and
CPU cycles, let's switch from dev_kfree_skb_any(), which passes skb
back to the mm layer, to napi_consume_skb(), which feeds those
caches on non-zero budget instead (falls back to the former on 0).
Do the replacement in e1000_unmap_and_free_tx_resource(). There are
4 call sites of this function throughout the driver:
* e1000_clean_tx_ring(). Slowpath, process context, cleans the
whole Tx ring on ifdown. Use budget of 0 here;
* e1000_tx_map(). Hotpath, net Tx softirq, unmaps the buffers in
case of error. Use 0 as well;
* e1000_clean_tx_irq(). Hotpath, NAPI Tx completion polling cycle.
As the driver doesn't count completed Tx entries towards the NAPI
budget, just use the poll budget of 64 to utilize caches.
Apart from being a preparation for switching to napi_build_skb(),
this is useful on its own as well, as napi_consume_skb() flushes
skb caches by batches of 32 instead of one-at-a-time.
Signed-off-by: Alexander Lobakin <alexandr.lobakin@intel.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Tested-by: Tony Brelinski <tony.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel')
| -rw-r--r-- | drivers/net/ethernet/intel/e1000/e1000_main.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c index 669060a2e6aa..975a145d48ef 100644 --- a/drivers/net/ethernet/intel/e1000/e1000_main.c +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c @@ -1953,7 +1953,8 @@ void e1000_free_all_tx_resources(struct e1000_adapter *adapter) static void e1000_unmap_and_free_tx_resource(struct e1000_adapter *adapter, - struct e1000_tx_buffer *buffer_info) + struct e1000_tx_buffer *buffer_info, + int budget) { if (buffer_info->dma) { if (buffer_info->mapped_as_page) @@ -1966,7 +1967,7 @@ e1000_unmap_and_free_tx_resource(struct e1000_adapter *adapter, buffer_info->dma = 0; } if (buffer_info->skb) { - dev_kfree_skb_any(buffer_info->skb); + napi_consume_skb(buffer_info->skb, budget); buffer_info->skb = NULL; } buffer_info->time_stamp = 0; @@ -1990,7 +1991,7 @@ static void e1000_clean_tx_ring(struct e1000_adapter *adapter, for (i = 0; i < tx_ring->count; i++) { buffer_info = &tx_ring->buffer_info[i]; - e1000_unmap_and_free_tx_resource(adapter, buffer_info); + e1000_unmap_and_free_tx_resource(adapter, buffer_info, 0); } netdev_reset_queue(adapter->netdev); @@ -2958,7 +2959,7 @@ dma_error: i += tx_ring->count; i--; buffer_info = &tx_ring->buffer_info[i]; - e1000_unmap_and_free_tx_resource(adapter, buffer_info); + e1000_unmap_and_free_tx_resource(adapter, buffer_info, 0); } return 0; @@ -3856,7 +3857,8 @@ static bool e1000_clean_tx_irq(struct e1000_adapter *adapter, } } - e1000_unmap_and_free_tx_resource(adapter, buffer_info); + e1000_unmap_and_free_tx_resource(adapter, buffer_info, + 64); tx_desc->upper.data = 0; if (unlikely(++i == tx_ring->count)) |