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netvsc: fix calculation of available send sections

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My change (introduced in 4.11) to use find_first_clear_bit
incorrectly assumed that the size argument was words, not bits.
The effect was only a small limited number of the available send
sections were being actually used. This can cause performance loss
with some workloads.

Since map_words is now used only during initialization, it can
be on stack instead of in per-device data.

Fixes: b58a185801 ("netvsc: simplify get next send section")
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger
2017-04-24 18:33:38 -07:00
committed by David S. Miller
parent a23f6ce6d9
commit fdfb70d275
2 changed files with 4 additions and 6 deletions
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drivers/net/hyperv/hyperv_net.h
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@@ -751,7 +751,6 @@ struct netvsc_device {
u32 send_section_cnt;
u32 send_section_size;
unsigned long *send_section_map;
int map_words;
/* Used for NetVSP initialization protocol */
struct completion channel_init_wait;