qeth: restore device features after recovery

After device recovery, only a basic set of network device features is
enabled on the device. If features like checksum offloading or TSO were
enabled by the user before the recovery, this results in a mismatch
between the network device features, that the kernel assumes to be
enabled on the device, and the features actually enabled on the device.

This patch tries to restore previously set features, that require
changes on the device, after the recovery of a device. In case of an
error, the network device's features are changed to contain only the
features that are actually turned on.

Signed-off-by: Hans Wippel <hwippel@linux.vnet.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index bf40063de202ff8280ce7503f103ce3c5db349b9..6d4b68c483f3dffed55d4f8508564d6a2bf9bef2 100644 (file)
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -999,6 +999,7 @@ struct qeth_cmd_buffer *qeth_get_setassparms_cmd(struct qeth_card *,
                                                 __u16, __u16,
                                                 enum qeth_prot_versions);
 int qeth_set_features(struct net_device *, netdev_features_t);
+int qeth_recover_features(struct net_device *);
 netdev_features_t qeth_fix_features(struct net_device *, netdev_features_t);
 
 /* exports for OSN */

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 7dba6c8537a16c18e550f311361b3bdf6231bd38..6ad5a14669e7978105eaddd1278f08a841ea00ff 100644 (file)
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -6131,6 +6131,35 @@ static int qeth_set_ipa_tso(struct qeth_card *card, int on)
        return rc;
 }
 
+/* try to restore device features on a device after recovery */
+int qeth_recover_features(struct net_device *dev)
+{
+       struct qeth_card *card = dev->ml_priv;
+       netdev_features_t recover = dev->features;
+
+       if (recover & NETIF_F_IP_CSUM) {
+               if (qeth_set_ipa_csum(card, 1, IPA_OUTBOUND_CHECKSUM))
+                       recover ^= NETIF_F_IP_CSUM;
+       }
+       if (recover & NETIF_F_RXCSUM) {
+               if (qeth_set_ipa_csum(card, 1, IPA_INBOUND_CHECKSUM))
+                       recover ^= NETIF_F_RXCSUM;
+       }
+       if (recover & NETIF_F_TSO) {
+               if (qeth_set_ipa_tso(card, 1))
+                       recover ^= NETIF_F_TSO;
+       }
+
+       if (recover == dev->features)
+               return 0;
+
+       dev_warn(&card->gdev->dev,
+                "Device recovery failed to restore all offload features\n");
+       dev->features = recover;
+       return -EIO;
+}
+EXPORT_SYMBOL_GPL(qeth_recover_features);
+
 int qeth_set_features(struct net_device *dev, netdev_features_t features)
 {
        struct qeth_card *card = dev->ml_priv;

diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index 7bc20c5188bc67f32a2f5ace493a5827d216c8e6..54fd89110ac78170e82f85c4a8197917bdaa3b3b 100644 (file)
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -1246,6 +1246,9 @@ contin:
                }
                /* this also sets saved unicast addresses */
                qeth_l2_set_rx_mode(card->dev);
+               rtnl_lock();
+               qeth_recover_features(card->dev);
+               rtnl_unlock();
        }
        /* let user_space know that device is online */
        kobject_uevent(&gdev->dev.kobj, KOBJ_CHANGE);

diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 72934666fedf0193bef37fcc5378127ed2a540c7..2f512715403b0fd4cc236df4f5eaef2ea894a10a 100644 (file)
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -3269,6 +3269,7 @@ contin:
                else
                        dev_open(card->dev);
                qeth_l3_set_multicast_list(card->dev);
+               qeth_recover_features(card->dev);
                rtnl_unlock();
        }
        qeth_trace_features(card);