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

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
<liranl@mellanox.com>.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Or Gerlitz 2012-01-11 19:03:51 +02:00 committed by Roland Dreier
parent 3eae7c9f97
commit d927d505c5
6 changed files with 7 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/infiniband/hw/mlx4/cq.c
View File

@ -720,7 +720,8 @@ repoll:
wc->dlid_path_bits = (g_mlpath_rqpn >> 24) & 0x7f;
wc->wc_flags |= g_mlpath_rqpn & 0x80000000 ? IB_WC_GRH : 0;
wc->pkey_index = be32_to_cpu(cqe->immed_rss_invalid) & 0x7f;
wc->csum_ok = mlx4_ib_ipoib_csum_ok(cqe->status, cqe->checksum);
wc->wc_flags |= mlx4_ib_ipoib_csum_ok(cqe->status,
cqe->checksum) ? IB_WC_IP_CSUM_OK : 0;
if (rdma_port_get_link_layer(wc->qp->device,
(*cur_qp)->port) == IB_LINK_LAYER_ETHERNET)
wc->sl = be16_to_cpu(cqe->sl_vid) >> 13;

3
drivers/infiniband/hw/mthca/mthca_cq.c
View File

@ -643,7 +643,8 @@ static inline int mthca_poll_one(struct mthca_dev *dev,
entry->wc_flags |= cqe->g_mlpath & 0x80 ? IB_WC_GRH : 0;
checksum = (be32_to_cpu(cqe->rqpn) >> 24) |
((be32_to_cpu(cqe->my_ee) >> 16) & 0xff00);
entry->csum_ok = (cqe->sl_ipok & 1 && checksum == 0xffff);
entry->wc_flags |= (cqe->sl_ipok & 1 && checksum == 0xffff) ?
IB_WC_IP_CSUM_OK : 0;
}
entry->status = IB_WC_SUCCESS;

1
drivers/infiniband/hw/qib/qib_rc.c
View File

@ -2048,7 +2048,6 @@ send_last:
wc.pkey_index = 0;
wc.dlid_path_bits = 0;
wc.port_num = 0;
wc.csum_ok = 0;
/* Signal completion event if the solicited bit is set. */
qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
(ohdr->bth[0] &

1
drivers/infiniband/hw/qib/qib_uc.c
View File

@ -422,7 +422,6 @@ last_imm:
wc.pkey_index = 0;
wc.dlid_path_bits = 0;
wc.port_num = 0;
wc.csum_ok = 0;
/* Signal completion event if the solicited bit is set. */
qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
(ohdr->bth[0] &

3
drivers/infiniband/ulp/ipoib/ipoib_ib.c
View File

@ -296,7 +296,8 @@ static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
dev->stats.rx_bytes += skb->len;
skb->dev = dev;
if ((dev->features & NETIF_F_RXCSUM) && likely(wc->csum_ok))
if ((dev->features & NETIF_F_RXCSUM) &&
likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
skb->ip_summed = CHECKSUM_UNNECESSARY;
napi_gro_receive(&priv->napi, skb);

2
include/rdma/ib_verbs.h
View File

@ -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 {