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svcrdma: Use llist for managing cache of recv_ctxts

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Use a wait-free mechanism for managing the svc_rdma_recv_ctxts free
list. Subsequently, sc_recv_lock can be eliminated.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Chuck Lever
2019-08-16 17:49:38 -04:00
committed by J. Bruce Fields
parent d6dfe43ec6
commit 4866073e6d
3 changed files with 14 additions and 18 deletions
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24
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
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@@ -172,9 +172,10 @@ static void svc_rdma_recv_ctxt_destroy(struct svcxprt_rdma *rdma,
void svc_rdma_recv_ctxts_destroy(struct svcxprt_rdma *rdma)
{
struct svc_rdma_recv_ctxt *ctxt;
struct llist_node *node;
while ((ctxt = svc_rdma_next_recv_ctxt(&rdma->sc_recv_ctxts))) {
list_del(&ctxt->rc_list);
while ((node = llist_del_first(&rdma->sc_recv_ctxts))) {
ctxt = llist_entry(node, struct svc_rdma_recv_ctxt, rc_node);
svc_rdma_recv_ctxt_destroy(rdma, ctxt);
}
}
@@ -183,21 +184,18 @@ static struct svc_rdma_recv_ctxt *
svc_rdma_recv_ctxt_get(struct svcxprt_rdma *rdma)
{
struct svc_rdma_recv_ctxt *ctxt;
struct llist_node *node;
spin_lock(&rdma->sc_recv_lock);
ctxt = svc_rdma_next_recv_ctxt(&rdma->sc_recv_ctxts);
if (!ctxt)
node = llist_del_first(&rdma->sc_recv_ctxts);
if (!node)
goto out_empty;
list_del(&ctxt->rc_list);
spin_unlock(&rdma->sc_recv_lock);
ctxt = llist_entry(node, struct svc_rdma_recv_ctxt, rc_node);
out:
ctxt->rc_page_count = 0;
return ctxt;
out_empty:
spin_unlock(&rdma->sc_recv_lock);
ctxt = svc_rdma_recv_ctxt_alloc(rdma);
if (!ctxt)
return NULL;
@@ -218,11 +216,9 @@ void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma,
for (i = 0; i < ctxt->rc_page_count; i++)
put_page(ctxt->rc_pages[i]);
if (!ctxt->rc_temp) {
spin_lock(&rdma->sc_recv_lock);
list_add(&ctxt->rc_list, &rdma->sc_recv_ctxts);
spin_unlock(&rdma->sc_recv_lock);
} else
if (!ctxt->rc_temp)
llist_add(&ctxt->rc_node, &rdma->sc_recv_ctxts);
else
svc_rdma_recv_ctxt_destroy(rdma, ctxt);
}