RDS: Add iWARP support

Support for iWARP NICs is implemented as a separate
RDS transport from IB. The code, however, is very
similar to IB (it was forked, basically.) so let's keep
it in one changeset.

The reason for this duplicationis that despite its similarity
to IB, there are a number of places where it has different
semantics. iwarp zcopy support is still under development,
and giving it its own sandbox ensures that IB code isn't
disrupted while iwarp changes. Over time these transports
will re-converge.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 95 insertions, 0 deletions

diff --git a/net/rds/iw_stats.c b/net/rds/iw_stats.c
new file mode 100644
index 000000000000..ccc7e8f0bf0e
--- /dev/null
+++ b/net/rds/iw_stats.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2006 Oracle.  All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#include <linux/percpu.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+
+#include "rds.h"
+#include "iw.h"
+
+DEFINE_PER_CPU(struct rds_iw_statistics, rds_iw_stats) ____cacheline_aligned;
+
+static char *rds_iw_stat_names[] = {
+        "iw_connect_raced",
+        "iw_listen_closed_stale",
+        "iw_tx_cq_call",
+        "iw_tx_cq_event",
+        "iw_tx_ring_full",
+        "iw_tx_throttle",
+        "iw_tx_sg_mapping_failure",
+        "iw_tx_stalled",
+        "iw_tx_credit_updates",
+        "iw_rx_cq_call",
+        "iw_rx_cq_event",
+        "iw_rx_ring_empty",
+        "iw_rx_refill_from_cq",
+        "iw_rx_refill_from_thread",
+        "iw_rx_alloc_limit",
+        "iw_rx_credit_updates",
+        "iw_ack_sent",
+        "iw_ack_send_failure",
+        "iw_ack_send_delayed",
+        "iw_ack_send_piggybacked",
+        "iw_ack_received",
+        "iw_rdma_mr_alloc",
+        "iw_rdma_mr_free",
+        "iw_rdma_mr_used",
+        "iw_rdma_mr_pool_flush",
+        "iw_rdma_mr_pool_wait",
+        "iw_rdma_mr_pool_depleted",
+};
+
+unsigned int rds_iw_stats_info_copy(struct rds_info_iterator *iter,
+                                    unsigned int avail)
+{
+        struct rds_iw_statistics stats = {0, };
+        uint64_t *src;
+        uint64_t *sum;
+        size_t i;
+        int cpu;
+
+        if (avail < ARRAY_SIZE(rds_iw_stat_names))
+                goto out;
+
+        for_each_online_cpu(cpu) {
+                src = (uint64_t *)&(per_cpu(rds_iw_stats, cpu));
+                sum = (uint64_t *)&stats;
+                for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
+                        *(sum++) += *(src++);
+        }
+
+        rds_stats_info_copy(iter, (uint64_t *)&stats, rds_iw_stat_names,
+                            ARRAY_SIZE(rds_iw_stat_names));
+out:
+        return ARRAY_SIZE(rds_iw_stat_names);
+}