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IB: Change CQE "csum_ok" field to a bit flag

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Use a bit in wc_flags rather then a whole integer to hold the
"checksum OK" flag.  By itself, this change doesn't reduce the size of
struct ib_wc on 64bit machines -- it stays on 56 bytes because of
padding.  However, it will allow to add more fields in the future
without enlarging the struct.  Also, it will let us have a unified
approach with future libibverbs checksum offload reporting, because a
bit flag doesn't break the library ABI.

This patch was suggested during conversation with Liran Liss
<[email protected]>.

Signed-off-by: Or Gerlitz <[email protected]>
Reviewed-by: Sean Hefty <[email protected]>
Signed-off-by: Roland Dreier <[email protected]>
This commit is contained in:
Or Gerlitz 2012-01-11 19:03:51 +02:00 • committed by Roland Dreier
commit d927d505c5
6 changed files with 7 additions and 6 deletions
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2
include/rdma/ib_verbs.h
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@ -518,6 +518,7 @@ enum ib_wc_flags {
IB_WC_GRH = 1,
IB_WC_WITH_IMM = (1<<1),
IB_WC_WITH_INVALIDATE = (1<<2),
IB_WC_IP_CSUM_OK = (1<<3),
};
struct ib_wc {
@ -538,7 +539,6 @@ struct ib_wc {
u8 sl;
u8 dlid_path_bits;
u8 port_num; /* valid only for DR SMPs on switches */
int csum_ok;
};
enum ib_cq_notify_flags {