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authorTom Tucker <tom@opengridcomputing.com>2008-09-30 13:46:13 -0500
committerTom Tucker <tom@opengridcomputing.com>2008-10-06 14:45:45 -0500
commit3a5c63803d0552a3ad93b85c262f12cd86471443 (patch)
treeaec8f9e66b2ac4258a7e379be5ce9abd5670da49 /net/sunrpc/xprtrdma
parent64be8608c163bd480cf5ec4b34366f11e0f3c87f (diff)
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svcrdma: Query device for Fast Reg support during connection setup
Query the device capabilities in the svc_rdma_accept function to determine what advanced memory management capabilities are supported by the device. Based on the query, select the most secure model available given the requirements of the transport and capabilities of the adapter. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Diffstat (limited to 'net/sunrpc/xprtrdma')
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma_transport.c76
1 files changed, 70 insertions, 6 deletions
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index f0b5c5f..a8ec4b1 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -807,6 +807,8 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
struct rdma_conn_param conn_param;
struct ib_qp_init_attr qp_attr;
struct ib_device_attr devattr;
+ int dma_mr_acc;
+ int need_dma_mr;
int ret;
int i;
@@ -922,15 +924,77 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
}
newxprt->sc_qp = newxprt->sc_cm_id->qp;
- /* Register all of physical memory */
- newxprt->sc_phys_mr = ib_get_dma_mr(newxprt->sc_pd,
- IB_ACCESS_LOCAL_WRITE |
- IB_ACCESS_REMOTE_WRITE);
- if (IS_ERR(newxprt->sc_phys_mr)) {
- dprintk("svcrdma: Failed to create DMA MR ret=%d\n", ret);
+ /*
+ * Use the most secure set of MR resources based on the
+ * transport type and available memory management features in
+ * the device. Here's the table implemented below:
+ *
+ * Fast Global DMA Remote WR
+ * Reg LKEY MR Access
+ * Sup'd Sup'd Needed Needed
+ *
+ * IWARP N N Y Y
+ * N Y Y Y
+ * Y N Y N
+ * Y Y N -
+ *
+ * IB N N Y N
+ * N Y N -
+ * Y N Y N
+ * Y Y N -
+ *
+ * NB: iWARP requires remote write access for the data sink
+ * of an RDMA_READ. IB does not.
+ */
+ if (devattr.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
+ newxprt->sc_frmr_pg_list_len =
+ devattr.max_fast_reg_page_list_len;
+ newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_FAST_REG;
+ }
+
+ /*
+ * Determine if a DMA MR is required and if so, what privs are required
+ */
+ switch (rdma_node_get_transport(newxprt->sc_cm_id->device->node_type)) {
+ case RDMA_TRANSPORT_IWARP:
+ newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_READ_W_INV;
+ if (!(newxprt->sc_dev_caps & SVCRDMA_DEVCAP_FAST_REG)) {
+ need_dma_mr = 1;
+ dma_mr_acc =
+ (IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_WRITE);
+ } else if (!(devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)) {
+ need_dma_mr = 1;
+ dma_mr_acc = IB_ACCESS_LOCAL_WRITE;
+ } else
+ need_dma_mr = 0;
+ break;
+ case RDMA_TRANSPORT_IB:
+ if (!(devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)) {
+ need_dma_mr = 1;
+ dma_mr_acc = IB_ACCESS_LOCAL_WRITE;
+ } else
+ need_dma_mr = 0;
+ break;
+ default:
goto errout;
}
+ /* Create the DMA MR if needed, otherwise, use the DMA LKEY */
+ if (need_dma_mr) {
+ /* Register all of physical memory */
+ newxprt->sc_phys_mr =
+ ib_get_dma_mr(newxprt->sc_pd, dma_mr_acc);
+ if (IS_ERR(newxprt->sc_phys_mr)) {
+ dprintk("svcrdma: Failed to create DMA MR ret=%d\n",
+ ret);
+ goto errout;
+ }
+ newxprt->sc_dma_lkey = newxprt->sc_phys_mr->lkey;
+ } else
+ newxprt->sc_dma_lkey =
+ newxprt->sc_cm_id->device->local_dma_lkey;
+
/* Post receive buffers */
for (i = 0; i < newxprt->sc_max_requests; i++) {
ret = svc_rdma_post_recv(newxprt);