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verbs: Add new unordered MR access flag #1780

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9adf26f
Update kernel headers
gurmichael Jul 21, 2026
f79c831
verbs: Fix reg MR man page
gurmichael Jul 21, 2026
1c01586
verbs: Add new Unordered MR access flag
gurmichael Jul 21, 2026
4fe46af
verbs/examples: Add unordered access to examples
gurmichael Jul 21, 2026
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1 change: 1 addition & 0 deletions kernel-headers/rdma/ib_user_ioctl_verbs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,7 @@ enum ib_uverbs_access_flags {
IB_UVERBS_ACCESS_FLUSH_PERSISTENT = 1 << 9,

IB_UVERBS_ACCESS_RELAXED_ORDERING = IB_UVERBS_ACCESS_OPTIONAL_FIRST,
IB_UVERBS_ACCESS_UNORDERED = IB_UVERBS_ACCESS_OPTIONAL_FIRST << 1,
IB_UVERBS_ACCESS_OPTIONAL_RANGE =
((IB_UVERBS_ACCESS_OPTIONAL_LAST << 1) - 1) &
~(IB_UVERBS_ACCESS_OPTIONAL_FIRST - 1)
Expand Down
12 changes: 11 additions & 1 deletion libibverbs/examples/rc_pingpong.c
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,7 @@ static int validate_buf;
static int use_dm;
static int allow_cc_unprotected;
static int use_new_send;
static int use_unordered;

struct pingpong_context {
struct ibv_context *context;
Expand Down Expand Up @@ -445,6 +446,9 @@ static struct pingpong_context *pp_init_ctx(struct ibv_device *ib_dev, int size,
}
}

if (use_unordered)
access_flags |= IBV_ACCESS_UNORDERED;

ctx->buf = ibv_alloc_buf(ctx->pd, size, &ctx->ibv_buf);
if (!ctx->buf) {
fprintf(stderr, "Couldn't allocate work buf.\n");
Expand Down Expand Up @@ -832,6 +836,7 @@ static void usage(const char *argv0)
printf(" -N, --new_send use new post send WR API\n");
printf(" -U, --allow-cc-unprotected allow allocation of unprotected/shared\n"
" memory on CoCo guests\n");
printf(" -W, --weak-ordering use weak (unordered) memory access\n");
}

int main(int argc, char *argv[])
Expand Down Expand Up @@ -883,10 +888,11 @@ int main(int argc, char *argv[])
{ .name = "dm", .has_arg = 0, .val = 'j' },
{ .name = "new_send", .has_arg = 0, .val = 'N' },
{ .name = "allow-cc-unprotected", .has_arg = 0, .val = 'U' },
{ .name = "weak-ordering", .has_arg = 0, .val = 'W' },
{}
};

c = getopt_long(argc, argv, "p:d:i:s:m:r:n:l:eg:oOPtcjNU",
c = getopt_long(argc, argv, "p:d:i:s:m:r:n:l:eg:oOPtcjNUW",
long_options, NULL);

if (c == -1)
Expand Down Expand Up @@ -974,6 +980,10 @@ int main(int argc, char *argv[])
allow_cc_unprotected = 1;
break;

case 'W':
use_unordered = 1;
break;

default:
usage(argv[0]);
return 1;
Expand Down
11 changes: 10 additions & 1 deletion libibverbs/examples/srq_pingpong.c
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,7 @@ enum {
static int page_size;
static int validate_buf;
static int use_odp;
static int use_unordered;

struct pingpong_context {
struct ibv_context *context;
Expand Down Expand Up @@ -395,6 +396,8 @@ static struct pingpong_context *pp_init_ctx(struct ibv_device *ib_dev, int size,
access_flags |= IBV_ACCESS_ON_DEMAND;
}

if (use_unordered)
access_flags |= IBV_ACCESS_UNORDERED;

if (use_event) {
ctx->channel = ibv_create_comp_channel(ctx->context);
Expand Down Expand Up @@ -638,6 +641,7 @@ static void usage(const char *argv0)
printf(" -g, --gid-idx=<gid index> local port gid index\n");
printf(" -o, --odp use on demand paging\n");
printf(" -c, --chk validate received buffer\n");
printf(" -W, --weak-ordering use weak (unordered) memory access\n");
}

int main(int argc, char *argv[])
Expand Down Expand Up @@ -687,10 +691,11 @@ int main(int argc, char *argv[])
{ .name = "odp", .has_arg = 0, .val = 'o' },
{ .name = "gid-idx", .has_arg = 1, .val = 'g' },
{ .name = "chk", .has_arg = 0, .val = 'c' },
{ .name = "weak-ordering", .has_arg = 0, .val = 'W' },
{}
};

c = getopt_long(argc, argv, "p:d:i:s:m:q:r:n:l:eog:c",
c = getopt_long(argc, argv, "p:d:i:s:m:q:r:n:l:eog:cW",
long_options, NULL);
if (c == -1)
break;
Expand Down Expand Up @@ -764,6 +769,10 @@ int main(int argc, char *argv[])
validate_buf = 1;
break;

case 'W':
use_unordered = 1;
break;

default:
usage(argv[0]);
return 1;
Expand Down
14 changes: 12 additions & 2 deletions libibverbs/examples/uc_pingpong.c
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Original file line number Diff line number Diff line change
Expand Up @@ -54,6 +54,7 @@ enum {

static int page_size;
static int validate_buf;
static int use_unordered;

struct pingpong_context {
struct ibv_context *context;
Expand Down Expand Up @@ -300,6 +301,7 @@ static struct pingpong_context *pp_init_ctx(struct ibv_device *ib_dev, int size,
int rx_depth, int port,
int use_event)
{
int access_flags = IBV_ACCESS_LOCAL_WRITE;
struct pingpong_context *ctx;

ctx = calloc(1, sizeof *ctx);
Expand Down Expand Up @@ -341,7 +343,9 @@ static struct pingpong_context *pp_init_ctx(struct ibv_device *ib_dev, int size,
goto clean_comp_channel;
}

ctx->mr = ibv_reg_mr(ctx->pd, ctx->buf, size, IBV_ACCESS_LOCAL_WRITE);
if (use_unordered)
access_flags |= IBV_ACCESS_UNORDERED;
ctx->mr = ibv_reg_mr(ctx->pd, ctx->buf, size, access_flags);
if (!ctx->mr) {
fprintf(stderr, "Couldn't register MR\n");
goto clean_pd;
Expand Down Expand Up @@ -526,6 +530,7 @@ static void usage(const char *argv0)
printf(" -e, --events sleep on CQ events (default poll)\n");
printf(" -g, --gid-idx=<gid index> local port gid index\n");
printf(" -c, --chk validate received buffer\n");
printf(" -W, --weak-ordering use weak (unordered) memory access\n");
}

int main(int argc, char *argv[])
Expand Down Expand Up @@ -569,10 +574,11 @@ int main(int argc, char *argv[])
{ .name = "events", .has_arg = 0, .val = 'e' },
{ .name = "gid-idx", .has_arg = 1, .val = 'g' },
{ .name = "chk", .has_arg = 0, .val = 'c' },
{ .name = "weak-ordering", .has_arg = 0, .val = 'W' },
{}
};

c = getopt_long(argc, argv, "p:d:i:s:m:r:n:l:eg:c",
c = getopt_long(argc, argv, "p:d:i:s:m:r:n:l:eg:cW",
long_options, NULL);
if (c == -1)
break;
Expand Down Expand Up @@ -634,6 +640,10 @@ int main(int argc, char *argv[])
validate_buf = 1;
break;

case 'W':
use_unordered = 1;
break;

default:
usage(argv[0]);
return 1;
Expand Down
14 changes: 12 additions & 2 deletions libibverbs/examples/ud_pingpong.c
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Original file line number Diff line number Diff line change
Expand Up @@ -54,6 +54,7 @@ enum {

static int page_size;
static int validate_buf;
static int use_unordered;

struct pingpong_context {
struct ibv_context *context;
Expand Down Expand Up @@ -296,6 +297,7 @@ static struct pingpong_context *pp_init_ctx(struct ibv_device *ib_dev, int size,
int rx_depth, int port,
int use_event)
{
int access_flags = IBV_ACCESS_LOCAL_WRITE;
struct pingpong_context *ctx;

ctx = malloc(sizeof *ctx);
Expand Down Expand Up @@ -352,7 +354,9 @@ static struct pingpong_context *pp_init_ctx(struct ibv_device *ib_dev, int size,
goto clean_comp_channel;
}

ctx->mr = ibv_reg_mr(ctx->pd, ctx->buf, size + 40, IBV_ACCESS_LOCAL_WRITE);
if (use_unordered)
access_flags |= IBV_ACCESS_UNORDERED;
ctx->mr = ibv_reg_mr(ctx->pd, ctx->buf, size + 40, access_flags);
if (!ctx->mr) {
fprintf(stderr, "Couldn't register MR\n");
goto clean_pd;
Expand Down Expand Up @@ -549,6 +553,7 @@ static void usage(const char *argv0)
printf(" -e, --events sleep on CQ events (default poll)\n");
printf(" -g, --gid-idx=<gid index> local port gid index\n");
printf(" -c, --chk validate received buffer\n");
printf(" -W, --weak-ordering use weak (unordered) memory access\n");
}

int main(int argc, char *argv[])
Expand Down Expand Up @@ -590,10 +595,11 @@ int main(int argc, char *argv[])
{ .name = "events", .has_arg = 0, .val = 'e' },
{ .name = "gid-idx", .has_arg = 1, .val = 'g' },
{ .name = "chk", .has_arg = 0, .val = 'c' },
{ .name = "weak-ordering", .has_arg = 0, .val = 'W' },
{}
};

c = getopt_long(argc, argv, "p:d:i:s:r:n:l:eg:c", long_options,
c = getopt_long(argc, argv, "p:d:i:s:r:n:l:eg:cW", long_options,
NULL);
if (c == -1)
break;
Expand Down Expand Up @@ -647,6 +653,10 @@ int main(int argc, char *argv[])
validate_buf = 1;
break;

case 'W':
use_unordered = 1;
break;

default:
usage(argv[0]);
return 1;
Expand Down
11 changes: 10 additions & 1 deletion libibverbs/examples/xsrq_pingpong.c
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,7 @@
#define TERMINATION_MSG "END"
static int page_size;
static int use_odp;
static int use_unordered;

struct pingpong_dest {
union ibv_gid gid;
Expand Down Expand Up @@ -233,6 +234,9 @@ static int pp_init_ctx(char *ib_devname)
access_flags |= IBV_ACCESS_ON_DEMAND;
}

if (use_unordered)
access_flags |= IBV_ACCESS_UNORDERED;

if (pp_get_port_info(ctx.context, ctx.ib_port, &port_attr)) {
fprintf(stderr, "Failed to get port info\n");
return 1;
Expand Down Expand Up @@ -869,6 +873,7 @@ static void usage(const char *argv0)
printf(" -e, --events sleep on CQ events (default poll)\n");
printf(" -o, --odp use on demand paging\n");
printf(" -g, --gid-idx=<gid index> local port gid index\n");
printf(" -W, --weak-ordering use weak (unordered) memory access\n");
}

int main(int argc, char *argv[])
Expand Down Expand Up @@ -896,10 +901,11 @@ int main(int argc, char *argv[])
{ .name = "events", .has_arg = 0, .val = 'e' },
{ .name = "odp", .has_arg = 0, .val = 'o' },
{ .name = "gid-idx", .has_arg = 1, .val = 'g' },
{ .name = "weak-ordering", .has_arg = 0, .val = 'W' },
{}
};

c = getopt_long(argc, argv, "p:d:i:s:m:n:l:eog:c:", long_options,
c = getopt_long(argc, argv, "p:d:i:s:m:n:l:eog:c:W", long_options,
NULL);
if (c == -1)
break;
Expand Down Expand Up @@ -950,6 +956,9 @@ int main(int argc, char *argv[])
case 'o':
use_odp = 1;
break;
case 'W':
use_unordered = 1;
break;
default:
usage(argv[0]);
return 1;
Expand Down
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