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s390: scatter-gather for inbound traffic in qeth driver

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For large incoming packets > PAGE_SIZE/2 qeth creates a fragmented skb
by adding pointers to qdio pages to the fragment list of the skb.
This avoids allocating big chunks of consecutive memory. Also copying
data from the qdio buffer to the skb is economized.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Frank Pavlic <fpavlic@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Frank Blaschka
2007-07-12 12:51:34 +02:00
committed by Jeff Garzik
parent 44c8215257
commit aa617aa956
3 changed files with 165 additions and 32 deletions
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6
drivers/s390/net/qeth_proc.c
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@@ -212,6 +212,12 @@ qeth_perf_procfile_seq_show(struct seq_file *s, void *it)
" Skb fragments sent in SG mode : %u\n\n",
card->perf_stats.sg_skbs_sent,
card->perf_stats.sg_frags_sent);
seq_printf(s, " Skbs received in SG mode : %u\n"
" Skb fragments received in SG mode : %u\n"
" Page allocations for rx SG mode : %u\n\n",
card->perf_stats.sg_skbs_rx,
card->perf_stats.sg_frags_rx,
card->perf_stats.sg_alloc_page_rx);
seq_printf(s, " large_send tx (in Kbytes) : %u\n"
" large_send count : %u\n\n",
card->perf_stats.large_send_bytes >> 10,