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Date: Mon, 14 May 2018 09:51:51 -0500
From: Steve Wise <swise@...ngridcomputing.com>
To: Leon Romanovsky <leon@...nel.org>
Cc: dsahern@...il.com, stephen@...workplumber.org,
netdev@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH v1 iproute2-next 2/3] rdma: print driver resource
attributes
On 5/13/2018 8:24 AM, Leon Romanovsky wrote:
> On Mon, May 07, 2018 at 08:53:16AM -0700, Steve Wise wrote:
>> This enhancement allows printing rdma device-specific state, if provided
>> by the kernel. This is done in a generic manner, so rdma tool doesn't
> Double space between "." and "This".
>
>> need to know about the details of every type of rdma device.
>>
>> Driver attributes for a rdma resource are in the form of <key,
>> [print_type], value> tuples, where the key is a string and the value can
>> be any supported driver attribute. The print_type attribute, if present,
> ditto
I'll fix these.
>> provides a print format to use vs the standard print format for the type.
>> For example, the default print type for a PROVIDER_S32 value is "%d ",
>> but "0x%x " if the print_type of PRINT_TYPE_HEX is included inthe tuple.
>>
>> Driver resources are only printed when the -dd flag is present.
>> If -p is present, then the output is formatted to not exceed 80 columns,
>> otherwise it is printed as a single row to be grep/awk friendly.
>>
>> Example output:
>>
>> # rdma resource show qp lqpn 1028 -dd -p
>> link cxgb4_0/- lqpn 1028 rqpn 0 type RC state RTS rq-psn 0 sq-psn 0 path-mig-state MIGRATED pid 0 comm [nvme_rdma]
>> sqid 1028 flushed 0 memsize 123968 cidx 85 pidx 85 wq_pidx 106 flush_cidx 85 in_use 0
>> size 386 flags 0x0 rqid 1029 memsize 16768 cidx 43 pidx 41 wq_pidx 171 msn 44 rqt_hwaddr 0x2a8a5d00
>> rqt_size 256 in_use 128 size 130 idx 43 wr_id 0xffff881057c03408 idx 40 wr_id 0xffff881057c033f0
>>
>> Signed-off-by: Steve Wise <swise@...ngridcomputing.com>
>> ---
>> rdma/rdma.c | 7 ++-
>> rdma/rdma.h | 11 ++++
>> rdma/res.c | 30 +++------
>> rdma/utils.c | 194 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>> 4 files changed, 221 insertions(+), 21 deletions(-)
>>
>> diff --git a/rdma/rdma.c b/rdma/rdma.c
>> index b43e538..0155627 100644
>> --- a/rdma/rdma.c
>> +++ b/rdma/rdma.c
>> @@ -132,6 +132,7 @@ int main(int argc, char **argv)
>> const char *batch_file = NULL;
>> bool pretty_output = false;
>> bool show_details = false;
>> + bool show_driver_details = false;
> Reversed Christmas tree please.
Sure.
>> bool json_output = false;
>> bool force = false;
>> char *filename;
>> @@ -152,7 +153,10 @@ int main(int argc, char **argv)
>> pretty_output = true;
>> break;
>> case 'd':
>> - show_details = true;
>> + if (show_details)
>> + show_driver_details = true;
>> + else
>> + show_details = true;
>> break;
>> case 'j':
>> json_output = true;
>> @@ -180,6 +184,7 @@ int main(int argc, char **argv)
>> argv += optind;
>>
>> rd.show_details = show_details;
>> + rd.show_driver_details = show_driver_details;
>> rd.json_output = json_output;
>> rd.pretty_output = pretty_output;
>>
>> diff --git a/rdma/rdma.h b/rdma/rdma.h
>> index 1908fc4..fcaf9e6 100644
>> --- a/rdma/rdma.h
>> +++ b/rdma/rdma.h
>> @@ -55,6 +55,7 @@ struct rd {
>> char **argv;
>> char *filename;
>> bool show_details;
>> + bool show_driver_details;
>> struct list_head dev_map_list;
>> uint32_t dev_idx;
>> uint32_t port_idx;
>> @@ -115,4 +116,14 @@ int rd_recv_msg(struct rd *rd, mnl_cb_t callback, void *data, uint32_t seq);
>> void rd_prepare_msg(struct rd *rd, uint32_t cmd, uint32_t *seq, uint16_t flags);
>> int rd_dev_init_cb(const struct nlmsghdr *nlh, void *data);
>> int rd_attr_cb(const struct nlattr *attr, void *data);
>> +int rd_attr_check(const struct nlattr *attr, int *typep);
>> +
>> +/*
>> + * Print helpers
>> + */
>> +void print_driver_table(struct rd *rd, struct nlattr *tb);
>> +void newline(struct rd *rd);
>> +void newline_indent(struct rd *rd);
>> +#define MAX_LINE_LENGTH 80
>> +
>> #endif /* _RDMA_TOOL_H_ */
>> diff --git a/rdma/res.c b/rdma/res.c
>> index 1a0aab6..074b992 100644
>> --- a/rdma/res.c
>> +++ b/rdma/res.c
>> @@ -439,10 +439,8 @@ static int res_qp_parse_cb(const struct nlmsghdr *nlh, void *data)
>> if (nla_line[RDMA_NLDEV_ATTR_RES_PID])
>> free(comm);
>>
>> - if (rd->json_output)
>> - jsonw_end_array(rd->jw);
>> - else
>> - pr_out("\n");
>> + print_driver_table(rd, nla_line[RDMA_NLDEV_ATTR_DRIVER]);
>> + newline(rd);
>> }
>> return MNL_CB_OK;
>> }
>> @@ -678,10 +676,8 @@ static int res_cm_id_parse_cb(const struct nlmsghdr *nlh, void *data)
>> if (nla_line[RDMA_NLDEV_ATTR_RES_PID])
>> free(comm);
>>
>> - if (rd->json_output)
>> - jsonw_end_array(rd->jw);
>> - else
>> - pr_out("\n");
>> + print_driver_table(rd, nla_line[RDMA_NLDEV_ATTR_DRIVER]);
>> + newline(rd);
>> }
>> return MNL_CB_OK;
>> }
>> @@ -804,10 +800,8 @@ static int res_cq_parse_cb(const struct nlmsghdr *nlh, void *data)
>> if (nla_line[RDMA_NLDEV_ATTR_RES_PID])
>> free(comm);
>>
>> - if (rd->json_output)
>> - jsonw_end_array(rd->jw);
>> - else
>> - pr_out("\n");
>> + print_driver_table(rd, nla_line[RDMA_NLDEV_ATTR_DRIVER]);
>> + newline(rd);
>> }
>> return MNL_CB_OK;
>> }
>> @@ -919,10 +913,8 @@ static int res_mr_parse_cb(const struct nlmsghdr *nlh, void *data)
>> if (nla_line[RDMA_NLDEV_ATTR_RES_PID])
>> free(comm);
>>
>> - if (rd->json_output)
>> - jsonw_end_array(rd->jw);
>> - else
>> - pr_out("\n");
>> + print_driver_table(rd, nla_line[RDMA_NLDEV_ATTR_DRIVER]);
>> + newline(rd);
>> }
>> return MNL_CB_OK;
>> }
>> @@ -1004,10 +996,8 @@ static int res_pd_parse_cb(const struct nlmsghdr *nlh, void *data)
>> if (nla_line[RDMA_NLDEV_ATTR_RES_PID])
>> free(comm);
>>
>> - if (rd->json_output)
>> - jsonw_end_array(rd->jw);
>> - else
>> - pr_out("\n");
>> + print_driver_table(rd, nla_line[RDMA_NLDEV_ATTR_DRIVER]);
>> + newline(rd);
>> }
>> return MNL_CB_OK;
>> }
>> diff --git a/rdma/utils.c b/rdma/utils.c
>> index 49c967f..452fe92 100644
>> --- a/rdma/utils.c
>> +++ b/rdma/utils.c
>> @@ -11,6 +11,7 @@
>>
>> #include "rdma.h"
>> #include <ctype.h>
>> +#include <inttypes.h>
>>
>> int rd_argc(struct rd *rd)
>> {
>> @@ -393,8 +394,32 @@ static const enum mnl_attr_data_type nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
>> [RDMA_NLDEV_ATTR_RES_MRLEN] = MNL_TYPE_U64,
>> [RDMA_NLDEV_ATTR_NDEV_INDEX] = MNL_TYPE_U32,
>> [RDMA_NLDEV_ATTR_NDEV_NAME] = MNL_TYPE_NUL_STRING,
>> + [RDMA_NLDEV_ATTR_DRIVER] = MNL_TYPE_NESTED,
>> + [RDMA_NLDEV_ATTR_DRIVER_ENTRY] = MNL_TYPE_NESTED,
>> + [RDMA_NLDEV_ATTR_DRIVER_STRING] = MNL_TYPE_NUL_STRING,
>> + [RDMA_NLDEV_ATTR_DRIVER_PRINT_TYPE] = MNL_TYPE_U8,
>> + [RDMA_NLDEV_ATTR_DRIVER_S32] = MNL_TYPE_U32,
>> + [RDMA_NLDEV_ATTR_DRIVER_U32] = MNL_TYPE_U32,
>> + [RDMA_NLDEV_ATTR_DRIVER_S64] = MNL_TYPE_U64,
>> + [RDMA_NLDEV_ATTR_DRIVER_U64] = MNL_TYPE_U64,
>> };
>>
>> +int rd_attr_check(const struct nlattr *attr, int *typep)
>> +{
>> + int type;
>> +
>> + if (mnl_attr_type_valid(attr, RDMA_NLDEV_ATTR_MAX) < 0)
>> + return MNL_CB_ERROR;
>> +
>> + type = mnl_attr_get_type(attr);
>> +
>> + if (mnl_attr_validate(attr, nldev_policy[type]) < 0)
>> + return MNL_CB_ERROR;
>> +
>> + *typep = nldev_policy[type];
>> + return MNL_CB_OK;
>> +}
>> +
>> int rd_attr_cb(const struct nlattr *attr, void *data)
>> {
>> const struct nlattr **tb = data;
>> @@ -660,3 +685,172 @@ struct dev_map *dev_map_lookup(struct rd *rd, bool allow_port_index)
>> free(dev_name);
>> return dev_map;
>> }
>> +
>> +#define nla_type(attr) ((attr)->nla_type & NLA_TYPE_MASK)
>> +
>> +void newline(struct rd *rd)
>> +{
>> + if (rd->json_output)
>> + jsonw_end_array(rd->jw);
>> + else
>> + pr_out("\n");
>> +}
>> +
>> +void newline_indent(struct rd *rd)
>> +{
>> + newline(rd);
>> + if (!rd->json_output)
>> + pr_out(" ");
>> +}
>> +
>> +static int print_driver_string(struct rd *rd, const char *key_str,
>> + const char *val_str)
>> +{
>> + if (rd->json_output) {
>> + jsonw_string_field(rd->jw, key_str, val_str);
>> + return 0;
>> + } else {
>> + return pr_out("%s %s ", key_str, val_str);
>> + }
>> +}
>> +
>> +static int print_driver_s32(struct rd *rd, const char *key_str, int32_t val,
>> + enum rdma_nldev_print_type print_type)
>> +{
>> + if (rd->json_output) {
>> + jsonw_int_field(rd->jw, key_str, val);
>> + return 0;
>> + }
>> + switch (print_type) {
>> + case RDMA_NLDEV_PRINT_TYPE_UNSPEC:
>> + return pr_out("%s %d ", key_str, val);
>> + case RDMA_NLDEV_PRINT_TYPE_HEX:
>> + return pr_out("%s 0x%x ", key_str, val);
>> + default:
>> + return -EINVAL;
>> + }
>> +}
>> +
>> +static int print_driver_u32(struct rd *rd, const char *key_str, uint32_t val,
>> + enum rdma_nldev_print_type print_type)
>> +{
>> + if (rd->json_output) {
>> + jsonw_int_field(rd->jw, key_str, val);
>> + return 0;
>> + }
>> + switch (print_type) {
>> + case RDMA_NLDEV_PRINT_TYPE_UNSPEC:
>> + return pr_out("%s %u ", key_str, val);
>> + case RDMA_NLDEV_PRINT_TYPE_HEX:
>> + return pr_out("%s 0x%x ", key_str, val);
>> + default:
>> + return -EINVAL;
>> + }
>> +}
>> +
>> +static int print_driver_s64(struct rd *rd, const char *key_str, int64_t val,
>> + enum rdma_nldev_print_type print_type)
>> +{
>> + if (rd->json_output) {
>> + jsonw_int_field(rd->jw, key_str, val);
>> + return 0;
>> + }
>> + switch (print_type) {
>> + case RDMA_NLDEV_PRINT_TYPE_UNSPEC:
>> + return pr_out("%s %" PRId64 " ", key_str, val);
>> + case RDMA_NLDEV_PRINT_TYPE_HEX:
>> + return pr_out("%s 0x%" PRIx64 " ", key_str, val);
>> + default:
>> + return -EINVAL;
>> + }
>> +}
>> +
>> +static int print_driver_u64(struct rd *rd, const char *key_str, uint64_t val,
>> + enum rdma_nldev_print_type print_type)
>> +{
>> + if (rd->json_output) {
>> + jsonw_int_field(rd->jw, key_str, val);
>> + return 0;
>> + }
>> + switch (print_type) {
>> + case RDMA_NLDEV_PRINT_TYPE_UNSPEC:
>> + return pr_out("%s %" PRIu64 " ", key_str, val);
>> + case RDMA_NLDEV_PRINT_TYPE_HEX:
>> + return pr_out("%s 0x%" PRIx64 " ", key_str, val);
>> + default:
>> + return -EINVAL;
>> + }
>> +}
>> +
>> +static int print_driver_entry(struct rd *rd, struct nlattr *key_attr,
>> + struct nlattr *val_attr,
>> + enum rdma_nldev_print_type print_type)
>> +{
>> + const char *key_str = mnl_attr_get_str(key_attr);
>> + int attr_type = nla_type(val_attr);
>> +
>> + switch (attr_type) {
>> + case RDMA_NLDEV_ATTR_DRIVER_STRING:
>> + return print_driver_string(rd, key_str,
>> + mnl_attr_get_str(val_attr));
>> + case RDMA_NLDEV_ATTR_DRIVER_S32:
>> + return print_driver_s32(rd, key_str,
>> + mnl_attr_get_u32(val_attr), print_type);
>> + case RDMA_NLDEV_ATTR_DRIVER_U32:
>> + return print_driver_u32(rd, key_str,
>> + mnl_attr_get_u32(val_attr), print_type);
>> + case RDMA_NLDEV_ATTR_DRIVER_S64:
>> + return print_driver_s64(rd, key_str,
>> + mnl_attr_get_u64(val_attr), print_type);
>> + case RDMA_NLDEV_ATTR_DRIVER_U64:
>> + return print_driver_u64(rd, key_str,
>> + mnl_attr_get_u64(val_attr), print_type);
>> + }
>> + return -EINVAL;
>> +}
>> +
>> +void print_driver_table(struct rd *rd, struct nlattr *tb)
>> +{
>> + int print_type = RDMA_NLDEV_PRINT_TYPE_UNSPEC;
>> + struct nlattr *tb_entry, *key = NULL, *val;
>> + int type, cc = 0;
>> +
>> + if (!rd->show_driver_details || !tb)
>> + return;
>> +
>> + if (rd->pretty_output)
>> + newline_indent(rd);
>> +
>> + /*
>> + * Driver attrs are tuples of {key, [print-type], value}.
>> + * The key must be a string. If print-type is present, it
>> + * defines an alternate printf format type vs the native format
>> + * for the attribute. And the value can be any available
>> + * driver type.
>> + */
>> + mnl_attr_for_each_nested(tb_entry, tb) {
>> +
>> + if (cc > MAX_LINE_LENGTH) {
>> + if (rd->pretty_output)
>> + newline_indent(rd);
>> + cc = 0;
>> + }
>> + if (rd_attr_check(tb_entry, &type) != MNL_CB_OK)
>> + return;
>> + if (!key) {
>> + if (type != MNL_TYPE_NUL_STRING)
>> + return;
>> + key = tb_entry;
>> + } else if (type == MNL_TYPE_U8) {
>> + print_type = mnl_attr_get_u8(tb_entry);
>> + } else {
>> + val = tb_entry;
>> + cc += print_driver_entry(rd, key, val, print_type);
> I stopped to read here, because of two problems:
> 1. print_driver_entry can return negative number, so unclear to me what
> will be the final result of "cc += ..".
> 2. The netlink design is to ignore unknown attributes and not return
> error. It allows to use new kernels with old applications.
Yes, this is a bug. See below the check for 'cc < 0':
>> + if (cc < 0)
>> + return;
It's incorrect. The return from print_driver_entry() should be checked
for error to allow ignoring unknown attrs, and then if no error, cc gets
incremented. I'll fix this up.
Thanks for reviewing,
Steve.
>> + print_type = RDMA_NLDEV_PRINT_TYPE_UNSPEC;
>> + key = NULL;
>> + }
>> + }
>> + return;
>> +}
>> --
>> 1.8.3.1
>>
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