[PATCH v02] net/af_packet: support link status update

[Gur Stavi <gur.stavi@huawei.com>]

For net_af_packet PMD, eth_link_update was an empty function.
Application may be interested in link up/down status.
This patch adds implementation that updates dev_link->link_status based
on socket IFF_RUNNING flag.

Signed-off-by: Gur Stavi <gur.stavi@huawei.com>
---
v2:
* return error on ioctl error

v1: https://mails.dpdk.org/archives/dev/2024-October/304831.html
---
 drivers/net/af_packet/rte_eth_af_packet.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/net/af_packet/rte_eth_af_packet.c b/drivers/net/af_packet/rte_eth_af_packet.c
index 68870dd3e2..fb4743f3e0 100644
--- a/drivers/net/af_packet/rte_eth_af_packet.c
+++ b/drivers/net/af_packet/rte_eth_af_packet.c
@@ -472,9 +472,22 @@ eth_dev_close(struct rte_eth_dev *dev)
 }

 static int
-eth_link_update(struct rte_eth_dev *dev __rte_unused,
+eth_link_update(struct rte_eth_dev *dev,
                 int wait_to_complete __rte_unused)
 {
+	const struct pmd_internals *internals = dev->data->dev_private;
+	struct rte_eth_link *dev_link = &dev->data->dev_link;
+	int sockfd = internals->rx_queue[0].sockfd;
+	struct ifreq ifr = { };
+
+	if (sockfd == -1)
+		return 0;
+
+	strlcpy(ifr.ifr_name, internals->if_name, IFNAMSIZ);
+	if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0)
+		return -errno;
+	dev_link->link_status = (ifr.ifr_flags & IFF_RUNNING) ?
+		RTE_ETH_LINK_UP : RTE_ETH_LINK_DOWN;
 	return 0;
 }


base-commit: 98613d32e3dac58d685f4f236cf8cc9733abaaf3
--
2.40.1