On 07/09/2014 12:57 PM, Chuck Lever wrote:
> If posting a FAST_REG_MR Work Reqeust fails, revert the rkey update
> to avoid subsequent IB_WC_MW_BIND_ERR completions.
>
> Suggested-by: Steve Wise <sw...@opengridcomputing.com>
> Signed-off-by: Chuck Lever <chuck.le...@oracle.com>
> ---
> net/sunrpc/xprtrdma/verbs.c | 27 ++++++++++++++++++++-------
> 1 file changed, 20 insertions(+), 7 deletions(-)
>
> diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
> index ce847d2..14d24ec 100644
> --- a/net/sunrpc/xprtrdma/verbs.c
> +++ b/net/sunrpc/xprtrdma/verbs.c
> @@ -1487,6 +1487,24 @@ rpcrdma_unmap_one(struct rpcrdma_ia *ia, struct
> rpcrdma_mr_seg *seg)
> seg->mr_dma, seg->mr_dmalen, seg->mr_dir);
> }
>
> +static void
> +rpcrdma_increment_frmr_rkey(struct rpcrdma_mw *mw)
> +{
> + struct ib_mr *mr = mw->r.frmr.fr_mr;
> + u8 key = mr->rkey & 0x000000FF;
It's not super obvious to be how this key is being calculated. Can you change
0x000000FF into a named constant to help?
It might also be useful to have an frmr_get_rkey() function rather than doing
this calculation in two different places.
Anna
> +
> + ib_update_fast_reg_key(mr, ++key);
> +}
> +
> +static void
> +rpcrdma_decrement_frmr_rkey(struct rpcrdma_mw *mw)
> +{
> + struct ib_mr *mr = mw->r.frmr.fr_mr;
> + u8 key = mr->rkey & 0x000000FF;
> +
> + ib_update_fast_reg_key(mr, --key);
> +}
> +
> static int
> rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg,
> int *nsegs, int writing, struct rpcrdma_ia *ia,
> @@ -1496,8 +1514,6 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg
> *seg,
> struct rpcrdma_mw *mw = seg1->mr_chunk.rl_mw;
> struct rpcrdma_frmr *frmr = &mw->r.frmr;
> struct ib_send_wr invalidate_wr, frmr_wr, *bad_wr, *post_wr;
> -
> - u8 key;
> int len, pageoff;
> int i, rc;
> int seg_len;
> @@ -1557,14 +1573,10 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg
> *seg,
> rc = -EIO;
> goto out_err;
> }
> -
> - /* Bump the key */
> - key = (u8)(frmr->fr_mr->rkey & 0x000000FF);
> - ib_update_fast_reg_key(frmr->fr_mr, ++key);
> -
> frmr_wr.wr.fast_reg.access_flags = (writing ?
> IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE :
> IB_ACCESS_REMOTE_READ);
> + rpcrdma_increment_frmr_rkey(mw);
> frmr_wr.wr.fast_reg.rkey = frmr->fr_mr->rkey;
> DECR_CQCOUNT(&r_xprt->rx_ep);
>
> @@ -1573,6 +1585,7 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg
> *seg,
> if (rc) {
> dprintk("RPC: %s: failed ib_post_send for register,"
> " status %i\n", __func__, rc);
> + rpcrdma_decrement_frmr_rkey(seg1->mr_chunk.rl_mw);
> goto out_err;
> } else {
> seg1->mr_rkey = frmr->fr_mr->rkey;
>
> --
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