Fix a problem introduced by a compiler upgrade (from gcc10 to gcc12.3),
which will lead the hns3 NIC can't link up. The root cause is strict
aliasing violation in rte_eth_linkstatus_set() with hns3 driver, see
[1] for more details.
This commit use union to avoid such aliasing violation. Also the
impacted components (cxgbe and qos_sched) have been adapted to the
struct change.
[1] https://inbox.dpdk.org/dev/8175c905-e661-b910-7f20-59b6ab605...@huawei.com/
Cc: sta...@dpdk.org
Signed-off-by: Chengwen Feng
Signed-off-by: Dengdui Huang
Acked-by: Morten Brørup
---
v8: address Ferruh's comments.
v7: add rte_atomic_store_explicit to get link status which address
Morten's comment, and add Morten's acked-by.
v6: fix DPDK CI compiler error with qos_sched.
v5: fix DPDK CI compiler error due to GCC extension [-Werror=pedantic]
v4: fix DPDK CI compiler error with cxgbe.
v3: fix checkpatch warning "missing --in-reply-to".
v2: add RTE_ATOMIC(uint64_t) wrap which address Morten's comment.
---
drivers/net/cxgbe/cxgbe_ethdev.c | 3 ++-
examples/qos_sched/init.c| 3 ++-
lib/ethdev/ethdev_driver.h | 24 +---
lib/ethdev/rte_ethdev.h | 17 +++--
4 files changed, 24 insertions(+), 23 deletions(-)
diff --git a/drivers/net/cxgbe/cxgbe_ethdev.c b/drivers/net/cxgbe/cxgbe_ethdev.c
index a27b9b266e..9b6a3651f9 100644
--- a/drivers/net/cxgbe/cxgbe_ethdev.c
+++ b/drivers/net/cxgbe/cxgbe_ethdev.c
@@ -211,9 +211,9 @@ int cxgbe_dev_link_update(struct rte_eth_dev *eth_dev,
unsigned int i, work_done, budget = 32;
struct link_config *lc = &pi->link_cfg;
struct adapter *adapter = pi->adapter;
- struct rte_eth_link new_link = { 0 };
u8 old_link = pi->link_cfg.link_ok;
struct sge *s = &adapter->sge;
+ struct rte_eth_link new_link;
for (i = 0; i < CXGBE_LINK_STATUS_POLL_CNT; i++) {
if (!s->fw_evtq.desc)
@@ -232,6 +232,7 @@ int cxgbe_dev_link_update(struct rte_eth_dev *eth_dev,
rte_delay_ms(CXGBE_LINK_STATUS_POLL_MS);
}
+ memset(&new_link, 0, sizeof(new_link));
new_link.link_status = cxgbe_force_linkup(adapter) ?
RTE_ETH_LINK_UP : pi->link_cfg.link_ok;
new_link.link_autoneg = (lc->link_caps & FW_PORT_CAP32_ANEG) ? 1 : 0;
diff --git a/examples/qos_sched/init.c b/examples/qos_sched/init.c
index d8abae635a..32964fd57e 100644
--- a/examples/qos_sched/init.c
+++ b/examples/qos_sched/init.c
@@ -335,7 +335,7 @@ int app_init(void)
for(i = 0; i < nb_pfc; i++) {
uint32_t socket = rte_lcore_to_socket_id(qos_conf[i].rx_core);
struct rte_ring *ring;
- struct rte_eth_link link = {0};
+ struct rte_eth_link link;
int retry_count = 100, retry_delay = 100; /* try every 100ms
for 10 sec */
snprintf(ring_name, MAX_NAME_LEN, "ring-%u-%u", i,
qos_conf[i].rx_core);
@@ -367,6 +367,7 @@ int app_init(void)
app_init_port(qos_conf[i].rx_port, qos_conf[i].mbuf_pool);
app_init_port(qos_conf[i].tx_port, qos_conf[i].mbuf_pool);
+ memset(&link, 0, sizeof(link));
rte_eth_link_get(qos_conf[i].tx_port, &link);
if (link.link_status == 0)
printf("Waiting for link on port %u\n",
qos_conf[i].tx_port);
diff --git a/lib/ethdev/ethdev_driver.h b/lib/ethdev/ethdev_driver.h
index 0dbf2dd6a2..883e59a927 100644
--- a/lib/ethdev/ethdev_driver.h
+++ b/lib/ethdev/ethdev_driver.h
@@ -1674,18 +1674,13 @@ static inline int
rte_eth_linkstatus_set(struct rte_eth_dev *dev,
const struct rte_eth_link *new_link)
{
- RTE_ATOMIC(uint64_t) *dev_link = (uint64_t __rte_atomic
*)&(dev->data->dev_link);
- union {
- uint64_t val64;
- struct rte_eth_link link;
- } orig;
-
- RTE_BUILD_BUG_ON(sizeof(*new_link) != sizeof(uint64_t));
+ struct rte_eth_link old_link;
- orig.val64 = rte_atomic_exchange_explicit(dev_link, *(const uint64_t
*)new_link,
- rte_memory_order_seq_cst);
+ old_link.val64 =
rte_atomic_exchange_explicit(&dev->data->dev_link.val64,
+ new_link->val64,
+ rte_memory_order_seq_cst);
- return (orig.link.link_status == new_link->link_status) ? -1 : 0;
+ return (old_link.link_status == new_link->link_status) ? -1 : 0;
}
/**
@@ -1701,12 +1696,11 @@ static inline void
rte_eth_linkstatus_get(const struct rte_eth_dev *dev,
struct rte_eth_link *link)
{
- RTE_ATOMIC(uint64_t) *src = (uint64_t __rte_atomic
*)&(dev->data->dev_link);
- uint64_t *dst = (uint64_t *)link;
-
- RTE_BUILD_BUG_ON(sizeof(*link) != sizeof(uint64_t));
+ struct rte_eth_link curr_link;
- *dst = rte_atomic_
