rdma: Add an option to query,set net namespace sharing sys parameter

Enrich rdmatool with an option to query rdma subsystem parameter
whether rdma devices are shared among multiple network namespaces
or exclusive to single network namespace.

rdma tool command examples and output.

$ rdma system show
netns shared

$ rdma system set netns exclusive

$ rdma system show
netns exclusive

Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: David Ahern <dsahern@gmail.com>

diff --git a/rdma/Makefile b/rdma/Makefile
index 6a4242341a62f3e622677acc9879dde3549cd996..4847f27eaf6a68de737603d8815801d47a59702b 100644 (file)
--- a/rdma/Makefile
+++ b/rdma/Makefile
@@ -7,7 +7,7 @@ ifeq ($(HAVE_MNL),y)
 CFLAGS += -I./include/uapi/
 
 RDMA_OBJ = rdma.o utils.o dev.o link.o res.o res-pd.o res-mr.o res-cq.o \
-          res-cmid.o res-qp.o
+          res-cmid.o res-qp.o sys.o
 
 TARGETS += rdma
 endif

diff --git a/rdma/rdma.c b/rdma/rdma.c
index 676e03c23088316fac634990b52168f1636d7ab0..e9f1b4bb21014a0cb7217e5d922f6ee4c9f644ef 100644 (file)
--- a/rdma/rdma.c
+++ b/rdma/rdma.c
@@ -11,7 +11,7 @@ static void help(char *name)
 {
        pr_out("Usage: %s [ OPTIONS ] OBJECT { COMMAND | help }\n"
               "       %s [ -f[orce] ] -b[atch] filename\n"
-              "where  OBJECT := { dev | link | resource | help }\n"
+              "where  OBJECT := { dev | link | resource | system | help }\n"
               "       OPTIONS := { -V[ersion] | -d[etails] | -j[son] | -p[retty]}\n", name, name);
 }
 
@@ -29,6 +29,7 @@ static int rd_cmd(struct rd *rd, int argc, char **argv)
                { "dev",        cmd_dev },
                { "link",       cmd_link },
                { "resource",   cmd_res },
+               { "system",     cmd_sys },
                { 0 }
        };
 

diff --git a/rdma/rdma.h b/rdma/rdma.h
index 9ed9e045044583442141a8e7242c1028b83323ae..885a751e61d97e9517505b7752c68e653da453d2 100644 (file)
--- a/rdma/rdma.h
+++ b/rdma/rdma.h
@@ -93,6 +93,7 @@ char *rd_argv(struct rd *rd);
 int cmd_dev(struct rd *rd);
 int cmd_link(struct rd *rd);
 int cmd_res(struct rd *rd);
+int cmd_sys(struct rd *rd);
 int rd_exec_cmd(struct rd *rd, const struct rd_cmd *c, const char *str);
 int rd_exec_dev(struct rd *rd, int (*cb)(struct rd *rd));
 int rd_exec_require_dev(struct rd *rd, int (*cb)(struct rd *rd));

diff --git a/rdma/sys.c b/rdma/sys.c
new file mode 100644 (file)
index 0000000..cef3908
--- /dev/null
+++ b/rdma/sys.c
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/*
+ * sys.c       RDMA tool
+ */
+
+#include "rdma.h"
+
+static int sys_help(struct rd *rd)
+{
+       pr_out("Usage: %s system show [ netns ]\n", rd->filename);
+       pr_out("       %s system set netns { shared | exclusive }\n", rd->filename);
+       return 0;
+}
+
+static const char *netns_modes_str[] = {
+       "exclusive",
+       "shared",
+};
+
+static int sys_show_parse_cb(const struct nlmsghdr *nlh, void *data)
+{
+       struct nlattr *tb[RDMA_NLDEV_ATTR_MAX] = {};
+       struct rd *rd = data;
+
+       mnl_attr_parse(nlh, 0, rd_attr_cb, tb);
+
+       if (tb[RDMA_NLDEV_SYS_ATTR_NETNS_MODE]) {
+               const char *mode_str;
+               uint8_t netns_mode;
+
+               netns_mode =
+                       mnl_attr_get_u8(tb[RDMA_NLDEV_SYS_ATTR_NETNS_MODE]);
+
+               if (netns_mode <= ARRAY_SIZE(netns_modes_str))
+                       mode_str = netns_modes_str[netns_mode];
+               else
+                       mode_str = "unknown";
+
+               if (rd->json_output)
+                       jsonw_string_field(rd->jw, "netns", mode_str);
+               else
+                       pr_out("netns %s\n", mode_str);
+       }
+       return MNL_CB_OK;
+}
+
+static int sys_show_no_args(struct rd *rd)
+{
+       uint32_t seq;
+       int ret;
+
+       rd_prepare_msg(rd, RDMA_NLDEV_CMD_SYS_GET,
+                      &seq, (NLM_F_REQUEST | NLM_F_ACK));
+       ret = rd_send_msg(rd);
+       if (ret)
+               return ret;
+
+       return rd_recv_msg(rd, sys_show_parse_cb, rd, seq);
+}
+
+static int sys_show(struct rd *rd)
+{
+       const struct rd_cmd cmds[] = {
+               { NULL,         sys_show_no_args},
+               { "netns",      sys_show_no_args},
+               { 0 }
+       };
+
+       return rd_exec_cmd(rd, cmds, "parameter");
+}
+
+static int sys_set_netns_cmd(struct rd *rd, bool enable)
+{
+       uint32_t seq;
+
+       rd_prepare_msg(rd, RDMA_NLDEV_CMD_SYS_SET,
+                      &seq, (NLM_F_REQUEST | NLM_F_ACK));
+       mnl_attr_put_u8(rd->nlh, RDMA_NLDEV_SYS_ATTR_NETNS_MODE, enable);
+
+       return rd_sendrecv_msg(rd, seq);
+}
+
+static bool sys_valid_netns_cmd(const char *cmd)
+{
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(netns_modes_str); i++) {
+               if (!strcmp(cmd, netns_modes_str[i]))
+                       return true;
+       }
+       return false;
+}
+
+static int sys_set_netns_args(struct rd *rd)
+{
+       bool cmd;
+
+       if (rd_no_arg(rd) || !sys_valid_netns_cmd(rd_argv(rd))) {
+               pr_err("valid options are: { shared | exclusive }\n");
+               return -EINVAL;
+       }
+
+       cmd = (strcmp(rd_argv(rd), "shared") == 0) ? true : false;
+
+       return sys_set_netns_cmd(rd, cmd);
+}
+
+static int sys_set_help(struct rd *rd)
+{
+       pr_out("Usage: %s system set [PARAM] value\n", rd->filename);
+       pr_out("            system set netns { shared | exclusive }\n");
+       return 0;
+}
+
+static int sys_set(struct rd *rd)
+{
+       const struct rd_cmd cmds[] = {
+               { NULL,                 sys_set_help },
+               { "help",               sys_set_help },
+               { "netns",              sys_set_netns_args},
+               { 0 }
+       };
+
+       return rd_exec_cmd(rd, cmds, "parameter");
+}
+
+int cmd_sys(struct rd *rd)
+{
+       const struct rd_cmd cmds[] = {
+               { NULL,         sys_show },
+               { "show",       sys_show },
+               { "set",        sys_set },
+               { "help",       sys_help },
+               { 0 }
+       };
+
+       return rd_exec_cmd(rd, cmds, "system command");
+}

diff --git a/rdma/utils.c b/rdma/utils.c
index 11ed8a73b2d3e4ea62a20927464bd1af8e45f920..558d1c29b4c54e6965f3f54b94aa1d800305c289 100644 (file)
--- a/rdma/utils.c
+++ b/rdma/utils.c
@@ -435,6 +435,7 @@ static const enum mnl_attr_data_type nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
        [RDMA_NLDEV_ATTR_DRIVER_U32] = MNL_TYPE_U32,
        [RDMA_NLDEV_ATTR_DRIVER_S64] = MNL_TYPE_U64,
        [RDMA_NLDEV_ATTR_DRIVER_U64] = MNL_TYPE_U64,
+       [RDMA_NLDEV_SYS_ATTR_NETNS_MODE] = MNL_TYPE_U8,
 };
 
 int rd_attr_check(const struct nlattr *attr, int *typep)