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Date: Sat, 30 Aug 2014 20:28:27 +0200 From: Florian Westphal <fw@...len.de> To: e1000-devel@...ts.sourceforge.net Cc: netdev@...r.kernel.org, Florian Westphal <fw@...len.de> Subject: [PATCH 7/7] e1000: switch to napi_gro_frags api napi_gro_frags allows skb re-use in case GRO can merge payload pages into an skb on the gro lists. netperf TCP_STREAM, kvm-e1000 emulation, mtu 9k: Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec old: 87380 16384 16384 30.00 8985.78 new: 87380 16384 16384 30.00 9907.05 Signed-off-by: Florian Westphal <fw@...len.de> --- drivers/net/ethernet/intel/e1000/e1000_main.c | 50 ++++++++++++++++++--------- 1 file changed, 33 insertions(+), 17 deletions(-) diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c index 9ac9a77..784a67f 100644 --- a/drivers/net/ethernet/intel/e1000/e1000_main.c +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c @@ -2117,10 +2117,8 @@ static void e1000_clean_rx_ring(struct e1000_adapter *adapter, } /* there also may be some cached data from a chained receive */ - if (rx_ring->rx_skb_top) { - dev_kfree_skb(rx_ring->rx_skb_top); - rx_ring->rx_skb_top = NULL; - } + napi_free_frags(&adapter->napi); + rx_ring->rx_skb_top = NULL; size = sizeof(struct e1000_rx_buffer) * rx_ring->count; memset(rx_ring->buffer_info, 0, size); @@ -4130,7 +4128,6 @@ static bool e1000_clean_jumbo_rx_irq(struct e1000_adapter *adapter, int cleaned_count = 0; bool cleaned = false; unsigned int total_rx_bytes=0, total_rx_packets=0; - static const unsigned int bufsz = 256 - 16; /* for skb_reserve */ i = rx_ring->next_to_clean; rx_desc = E1000_RX_DESC(*rx_ring, i); @@ -4189,7 +4186,7 @@ process_skb: /* this descriptor is only the beginning (or middle) */ if (!rxtop) { /* this is the beginning of a chain */ - rxtop = e1000_alloc_rx_skb(adapter, bufsz); + rxtop = napi_get_frags(&adapter->napi); if (!rxtop) break; @@ -4218,14 +4215,17 @@ process_skb: /* no chain, got EOP, this buf is the packet * copybreak to save the put_page/alloc_page */ - skb = e1000_alloc_rx_skb(adapter, bufsz); - if (!skb) - break; p = buffer_info->rxbuf.page; - if (length <= copybreak && - skb_tailroom(skb) >= length) { + if (length <= copybreak) { u8 *vaddr; + if (likely(!(netdev->features & NETIF_F_RXFCS))) + length -= 4; + skb = e1000_alloc_rx_skb(adapter, + length); + if (!skb) + break; + vaddr = kmap_atomic(p); memcpy(skb_tail_pointer(skb), vaddr, length); @@ -4234,7 +4234,23 @@ process_skb: * buffer_info->rxbuf.page */ skb_put(skb, length); + e1000_rx_checksum(adapter, + (u32)(status) | + ((u32)(rx_desc->errors) << 24), + le16_to_cpu(rx_desc->csum), skb); + + total_rx_bytes += skb->len; + total_rx_packets++; + + e1000_receive_skb(adapter, status, + rx_desc->special, skb); + goto next_desc; } else { + skb = napi_get_frags(&adapter->napi); + if (!skb) { + adapter->alloc_rx_buff_failed++; + break; + } skb_fill_page_desc(skb, 0, p, 0, length); e1000_consume_page(buffer_info, skb, @@ -4254,14 +4270,14 @@ process_skb: pskb_trim(skb, skb->len - 4); total_rx_packets++; - /* eth type trans needs skb->data to point to something */ - if (!pskb_may_pull(skb, ETH_HLEN)) { - e_err(drv, "pskb_may_pull failed.\n"); - dev_kfree_skb(skb); - goto next_desc; + if (status & E1000_RXD_STAT_VP) { + __le16 vlan = rx_desc->special; + u16 vid = le16_to_cpu(vlan) & E1000_RXD_SPC_VLAN_MASK; + + __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid); } - e1000_receive_skb(adapter, status, rx_desc->special, skb); + napi_gro_frags(&adapter->napi); next_desc: rx_desc->status = 0; -- 1.8.1.5 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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