diff options
| author | Chuck Lever | 2015-05-26 17:52:06 +0200 |
|---|---|---|
| committer | Anna Schumaker | 2015-06-12 19:10:36 +0200 |
| commit | 346aa66b2ab7988ca105f7fee5a968c11712b0d8 (patch) | |
| tree | 6b8c77c21c658d87f3ca8055d8aabe7ef12c575a /net/sunrpc/xprtrdma/verbs.c | |
| parent | xprtrdma: Use ib_device pointer safely (diff) | |
| download | kernel-qcow2-linux-346aa66b2ab7988ca105f7fee5a968c11712b0d8.tar.gz kernel-qcow2-linux-346aa66b2ab7988ca105f7fee5a968c11712b0d8.tar.xz kernel-qcow2-linux-346aa66b2ab7988ca105f7fee5a968c11712b0d8.zip | |
xprtrdma: Introduce helpers for allocating MWs
We eventually want to handle allocating MWs one at a time, as
needed, instead of grabbing 64 and throwing them at each RPC in the
pipeline.
Add a helper for grabbing an MW off rb_mws, and a helper for
returning an MW to rb_mws. These will be used in a subsequent patch.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Tested-By: Devesh Sharma <devesh.sharma@avagotech.com>
Reviewed-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc/xprtrdma/verbs.c')
| -rw-r--r-- | net/sunrpc/xprtrdma/verbs.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index ddd5b362da35..b7ca73e7e2e6 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -1173,6 +1173,37 @@ rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf) kfree(buf->rb_pool); } +struct rpcrdma_mw * +rpcrdma_get_mw(struct rpcrdma_xprt *r_xprt) +{ + struct rpcrdma_buffer *buf = &r_xprt->rx_buf; + struct rpcrdma_mw *mw = NULL; + unsigned long flags; + + spin_lock_irqsave(&buf->rb_lock, flags); + if (!list_empty(&buf->rb_mws)) { + mw = list_first_entry(&buf->rb_mws, + struct rpcrdma_mw, mw_list); + list_del_init(&mw->mw_list); + } + spin_unlock_irqrestore(&buf->rb_lock, flags); + + if (!mw) + pr_err("RPC: %s: no MWs available\n", __func__); + return mw; +} + +void +rpcrdma_put_mw(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mw *mw) +{ + struct rpcrdma_buffer *buf = &r_xprt->rx_buf; + unsigned long flags; + + spin_lock_irqsave(&buf->rb_lock, flags); + list_add_tail(&mw->mw_list, &buf->rb_mws); + spin_unlock_irqrestore(&buf->rb_lock, flags); +} + /* "*mw" can be NULL when rpcrdma_buffer_get_mrs() fails, leaving * some req segments uninitialized. */ |