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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
--
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