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selftests: drv-net: add HDS payload sweep test for devmem TCP

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Add check_rx_hds test that verifies header/data split works across
payload sizes. The test sweeps payload sizes from 1 byte to 8KB, if any
data propagates up to userspace as SCM_DEVMEM_LINEAR, then the test
fails. This shows that regardless of payload size, ncdevmem's
configuration of hds-thresh to 0 is respected.

Add -L (--fail-on-linear) flag to ncdevmem that causes the receiver to
fail if any SCM_DEVMEM_LINEAR cmsg is received.

Use socat option for fixed block sizing and tcp nodelay to disable
nagle's algo to avoid buffering.

Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://patch.msgid.link/20260211-fbnic-tcp-hds-fixes-v1-4-55d050e6f606@meta.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Bobby Eshleman
2026-02-11 17:00:44 -08:00
committed by Paolo Abeni
parent 0f30a31b55
commit e7a3c1adc1
2 changed files with 28 additions and 2 deletions
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19
tools/testing/selftests/drivers/net/hw/devmem.py
View File

@@ -63,12 +63,29 @@ def check_tx_chunks(cfg) -> None:
ksft_eq(socat.stdout.strip(), "hello\nworld")
def check_rx_hds(cfg) -> None:
"""Test HDS splitting across payload sizes."""
require_devmem(cfg)
for size in [1, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192]:
port = rand_port()
listen_cmd = f"{cfg.bin_local} -L -l -f {cfg.ifname} -s {cfg.addr} -p {port}"
with bkg(listen_cmd, exit_wait=True) as ncdevmem:
wait_port_listen(port)
cmd(f"dd if=/dev/zero bs={size} count=1 2>/dev/null | " +
f"socat -b {size} -u - TCP{cfg.addr_ipver}:{cfg.baddr}:{port},nodelay",
host=cfg.remote, shell=True)
ksft_eq(ncdevmem.ret, 0, f"HDS failed for payload size {size}")
def main() -> None:
with NetDrvEpEnv(__file__) as cfg:
cfg.bin_local = path.abspath(path.dirname(__file__) + "/ncdevmem")
cfg.bin_remote = cfg.remote.deploy(cfg.bin_local)
ksft_run([check_rx, check_tx, check_tx_chunks],
ksft_run([check_rx, check_tx, check_tx_chunks, check_rx_hds],
args=(cfg, ))
ksft_exit()

11
tools/testing/selftests/drivers/net/hw/ncdevmem.c
View File

@@ -98,6 +98,7 @@ static unsigned int ifindex;
static unsigned int dmabuf_id;
static uint32_t tx_dmabuf_id;
static int waittime_ms = 500;
static bool fail_on_linear;
/* System state loaded by current_config_load() */
#define MAX_FLOWS 8
@@ -975,6 +976,11 @@ static int do_server(struct memory_buffer *mem)
"SCM_DEVMEM_LINEAR. dmabuf_cmsg->frag_size=%u\n",
dmabuf_cmsg->frag_size);
if (fail_on_linear) {
pr_err("received SCM_DEVMEM_LINEAR but --fail-on-linear (-L) set");
goto err_close_client;
}
continue;
}
@@ -1398,8 +1404,11 @@ int main(int argc, char *argv[])
int is_server = 0, opt;
int ret, err = 1;
while ((opt = getopt(argc, argv, "ls:c:p:v:q:t:f:z:")) != -1) {
while ((opt = getopt(argc, argv, "Lls:c:p:v:q:t:f:z:")) != -1) {
switch (opt) {
case 'L':
fail_on_linear = true;
break;
case 'l':
is_server = 1;
break;