From 4b7ae12216948229b065d6bf4776a5681d46330c Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Tue, 12 Feb 2019 18:33:23 +0100 Subject: s390/qeth: allow cmd callbacks to return errnos Error propagation from cmd callbacks currently works in a way where qeth_send_control_data_cb() picks the raw HW code from the response, and the cmd's originator later translates this into an errno. The callback itself only returns 0 ("done") or 1 ("expect more data"). This is 1. limiting, as the only means for the callback to report an internal error is to invent pseudo HW codes (such as IPA_RC_ENOMEM), that the originator then needs to understand. For non-IPA callbacks, we even provide a separate field in the IO buffer metadata (iob->rc) so the callback can pass back a return value. 2. fragile, as the originator must take care to not translate any errno that is returned by qeth's own IO code paths (eg -ENOMEM). Also, any originator that forgets to translate the HW codes potentially passes garbage back to its caller. For instance, see commit 2aa4867198c2 ("s390/qeth: translate SETVLAN/DELVLAN errors"). Introduce a new model where all HW error translation is done within the callback, and the callback returns > 0, if it expects more data (as before) == 0, on success < 0, with an errno Start off with converting all callbacks to the new model that either a) pass back pseudo HW codes, or b) have a dependency on a specific HW error code. Also convert c) the one callback that uses iob->rc, and d) qeth_setadpparms_change_macaddr_cb() so that it can pass back an error back to qeth_l2_request_initial_mac() even when the cmd itself was successful. The old model remains supported: if the callback returns 0, we still propagate the response's HW error code back to the originator. Signed-off-by: Julian Wiedmann Signed-off-by: David S. Miller --- drivers/s390/net/qeth_core.h | 1 - drivers/s390/net/qeth_core_main.c | 82 +++++++++++++++++++++------------------ drivers/s390/net/qeth_core_mpc.c | 4 +- drivers/s390/net/qeth_core_mpc.h | 1 - drivers/s390/net/qeth_l2_main.c | 2 +- drivers/s390/net/qeth_l3_main.c | 50 ++++++++++++++---------- 6 files changed, 76 insertions(+), 64 deletions(-) (limited to 'drivers/s390/net') diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h index 83f710336685..18696ffb662d 100644 --- a/drivers/s390/net/qeth_core.h +++ b/drivers/s390/net/qeth_core.h @@ -597,7 +597,6 @@ struct qeth_cmd_buffer { struct qeth_channel *channel; struct qeth_reply *reply; unsigned char *data; - int rc; void (*callback)(struct qeth_card *card, struct qeth_channel *channel, struct qeth_cmd_buffer *iob); }; diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index b1a7a35a086e..cdb65ba99888 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -747,7 +747,6 @@ void qeth_release_buffer(struct qeth_channel *channel, qeth_put_reply(iob->reply); iob->reply = NULL; } - iob->rc = 0; spin_unlock_irqrestore(&channel->iob_lock, flags); wake_up(&channel->wait_q); } @@ -809,7 +808,6 @@ static void qeth_send_control_data_cb(struct qeth_card *card, struct qeth_reply *reply = NULL; struct qeth_reply *r; unsigned long flags; - int keep_reply = 0; int rc = 0; QETH_CARD_TEXT(card, 4, "sndctlcb"); @@ -857,22 +855,27 @@ static void qeth_send_control_data_cb(struct qeth_card *card, if (!reply) goto out; - if (reply->callback) { + if (!reply->callback) { + rc = 0; + } else { if (cmd) { reply->offset = (u16)((char *)cmd - (char *)iob->data); - keep_reply = reply->callback(card, reply, - (unsigned long)cmd); - } else - keep_reply = reply->callback(card, reply, - (unsigned long)iob); + rc = reply->callback(card, reply, (unsigned long)cmd); + } else { + rc = reply->callback(card, reply, (unsigned long)iob); + } } - if (cmd) - reply->rc = (u16) cmd->hdr.return_code; - else if (iob->rc) - reply->rc = iob->rc; - if (!keep_reply) + if (rc <= 0) { + if (cmd) + reply->rc = (u16) cmd->hdr.return_code; + + /* for callbacks with proper errnos: */ + if (rc < 0) + reply->rc = rc; qeth_notify_reply(reply); + } + qeth_put_reply(reply); out: @@ -1293,7 +1296,6 @@ static int qeth_setup_channel(struct qeth_channel *channel, bool alloc_buffers) channel->iob[cnt].state = BUF_STATE_FREE; channel->iob[cnt].channel = channel; channel->iob[cnt].callback = qeth_send_control_data_cb; - channel->iob[cnt].rc = 0; } if (cnt < QETH_CMD_BUFFER_NO) { qeth_clean_channel(channel); @@ -2343,9 +2345,8 @@ static int qeth_ulp_setup_cb(struct qeth_card *card, struct qeth_reply *reply, QETH_DBF_TEXT(SETUP, 2, "olmlimit"); dev_err(&card->gdev->dev, "A connection could not be " "established because of an OLM limit\n"); - iob->rc = -EMLINK; + return -EMLINK; } - QETH_DBF_TEXT_(SETUP, 2, " rc%d", iob->rc); return 0; } @@ -2900,9 +2901,19 @@ int qeth_send_ipa_cmd(struct qeth_card *card, struct qeth_cmd_buffer *iob, } EXPORT_SYMBOL_GPL(qeth_send_ipa_cmd); +static int qeth_send_startlan_cb(struct qeth_card *card, + struct qeth_reply *reply, unsigned long data) +{ + struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *) data; + + if (cmd->hdr.return_code == IPA_RC_LAN_OFFLINE) + return -ENETDOWN; + + return (cmd->hdr.return_code) ? -EIO : 0; +} + static int qeth_send_startlan(struct qeth_card *card) { - int rc; struct qeth_cmd_buffer *iob; QETH_DBF_TEXT(SETUP, 2, "strtlan"); @@ -2910,8 +2921,7 @@ static int qeth_send_startlan(struct qeth_card *card) iob = qeth_get_ipacmd_buffer(card, IPA_CMD_STARTLAN, 0); if (!iob) return -ENOMEM; - rc = qeth_send_ipa_cmd(card, iob, NULL, NULL); - return rc; + return qeth_send_ipa_cmd(card, iob, qeth_send_startlan_cb, NULL); } static int qeth_setadpparms_inspect_rc(struct qeth_ipa_cmd *cmd) @@ -4238,12 +4248,15 @@ static int qeth_setadpparms_change_macaddr_cb(struct qeth_card *card, QETH_CARD_TEXT(card, 4, "chgmaccb"); if (qeth_setadpparms_inspect_rc(cmd)) - return 0; + return -EIO; adp_cmd = &cmd->data.setadapterparms; + if (!is_valid_ether_addr(adp_cmd->data.change_addr.addr)) + return -EADDRNOTAVAIL; + if (IS_LAYER2(card) && IS_OSD(card) && !IS_VM_NIC(card) && !(adp_cmd->hdr.flags & QETH_SETADP_FLAGS_VIRTUAL_MAC)) - return 0; + return -EADDRNOTAVAIL; ether_addr_copy(card->dev->dev_addr, adp_cmd->data.change_addr.addr); return 0; @@ -4507,13 +4520,13 @@ static int qeth_snmp_command_cb(struct qeth_card *card, if (cmd->hdr.return_code) { QETH_CARD_TEXT_(card, 4, "scer1%x", cmd->hdr.return_code); - return 0; + return -EIO; } if (cmd->data.setadapterparms.hdr.return_code) { cmd->hdr.return_code = cmd->data.setadapterparms.hdr.return_code; QETH_CARD_TEXT_(card, 4, "scer2%x", cmd->hdr.return_code); - return 0; + return -EIO; } data_len = *((__u16 *)QETH_IPA_PDU_LEN_PDU1(data)); if (cmd->data.setadapterparms.hdr.seq_no == 1) { @@ -4528,9 +4541,8 @@ static int qeth_snmp_command_cb(struct qeth_card *card, /* check if there is enough room in userspace */ if ((qinfo->udata_len - qinfo->udata_offset) < data_len) { - QETH_CARD_TEXT_(card, 4, "scer3%i", -ENOMEM); - cmd->hdr.return_code = IPA_RC_ENOMEM; - return 0; + QETH_CARD_TEXT_(card, 4, "scer3%i", -ENOSPC); + return -ENOSPC; } QETH_CARD_TEXT_(card, 4, "snore%i", cmd->data.setadapterparms.hdr.used_total); @@ -4625,16 +4637,14 @@ static int qeth_setadpparms_query_oat_cb(struct qeth_card *card, QETH_CARD_TEXT(card, 3, "qoatcb"); if (qeth_setadpparms_inspect_rc(cmd)) - return 0; + return -EIO; priv = (struct qeth_qoat_priv *)reply->param; resdatalen = cmd->data.setadapterparms.hdr.cmdlength; resdata = (char *)data + 28; - if (resdatalen > (priv->buffer_len - priv->response_len)) { - cmd->hdr.return_code = IPA_RC_FFFF; - return 0; - } + if (resdatalen > (priv->buffer_len - priv->response_len)) + return -ENOSPC; memcpy((priv->buffer + priv->response_len), resdata, resdatalen); @@ -4707,9 +4717,7 @@ static int qeth_query_oat_command(struct qeth_card *card, char __user *udata) if (copy_to_user(udata, &oat_data, sizeof(struct qeth_query_oat_data))) rc = -EFAULT; - } else - if (rc == IPA_RC_FFFF) - rc = -EFAULT; + } out_free: vfree(priv.buffer); @@ -5128,12 +5136,10 @@ retriable: rc = qeth_send_startlan(card); if (rc) { QETH_DBF_TEXT_(SETUP, 2, "6err%d", rc); - if (rc == IPA_RC_LAN_OFFLINE) { - dev_warn(&card->gdev->dev, - "The LAN is offline\n"); + if (rc == -ENETDOWN) { + dev_warn(&card->gdev->dev, "The LAN is offline\n"); *carrier_ok = false; } else { - rc = -ENODEV; goto out; } } else { diff --git a/drivers/s390/net/qeth_core_mpc.c b/drivers/s390/net/qeth_core_mpc.c index 7ff221ae0a2e..e3f4866c158e 100644 --- a/drivers/s390/net/qeth_core_mpc.c +++ b/drivers/s390/net/qeth_core_mpc.c @@ -201,12 +201,10 @@ static const struct ipa_rc_msg qeth_ipa_rc_msg[] = { {IPA_RC_LAN_OFFLINE, "STRTLAN_LAN_DISABLED - LAN offline"}, {IPA_RC_VEPA_TO_VEB_TRANSITION, "Adj. switch disabled port mode RR"}, {IPA_RC_INVALID_IP_VERSION2, "Invalid IP version"}, - {IPA_RC_ENOMEM, "Memory problem"}, + /* default for qeth_get_ipa_msg(): */ {IPA_RC_FFFF, "Unknown Error"} }; - - const char *qeth_get_ipa_msg(enum qeth_ipa_return_codes rc) { int x; diff --git a/drivers/s390/net/qeth_core_mpc.h b/drivers/s390/net/qeth_core_mpc.h index 7919a0c8109a..4b1690380ebe 100644 --- a/drivers/s390/net/qeth_core_mpc.h +++ b/drivers/s390/net/qeth_core_mpc.h @@ -229,7 +229,6 @@ enum qeth_ipa_return_codes { IPA_RC_LAN_OFFLINE = 0xe080, IPA_RC_VEPA_TO_VEB_TRANSITION = 0xe090, IPA_RC_INVALID_IP_VERSION2 = 0xf001, - IPA_RC_ENOMEM = 0xfffe, IPA_RC_FFFF = 0xffff }; /* for VNIC Characteristics */ diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c index 453b3f7f272c..6d9eb54ea3b0 100644 --- a/drivers/s390/net/qeth_l2_main.c +++ b/drivers/s390/net/qeth_l2_main.c @@ -393,7 +393,7 @@ static int qeth_l2_request_initial_mac(struct qeth_card *card) if (!IS_OSN(card)) { rc = qeth_setadpparms_change_macaddr(card); - if (!rc && is_valid_ether_addr(card->dev->dev_addr)) + if (!rc) goto out; QETH_DBF_MESSAGE(2, "READ_MAC Assist failed on device %x: %#x\n", CARD_DEVID(card), rc); diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c index f0b790810ebc..852bfd5cc3e9 100644 --- a/drivers/s390/net/qeth_l3_main.c +++ b/drivers/s390/net/qeth_l3_main.c @@ -253,8 +253,7 @@ static int qeth_l3_add_ip(struct qeth_card *card, struct qeth_ipaddr *tmp_addr) } else rc = qeth_l3_register_addr_entry(card, addr); - if (!rc || (rc == IPA_RC_DUPLICATE_IP_ADDRESS) || - (rc == IPA_RC_LAN_OFFLINE)) { + if (!rc || rc == -EADDRINUSE || rc == -ENETDOWN) { addr->disp_flag = QETH_DISP_ADDR_DO_NOTHING; if (addr->ref_counter < 1) { qeth_l3_deregister_addr_entry(card, addr); @@ -338,10 +337,28 @@ static void qeth_l3_recover_ip(struct qeth_card *card) } +static int qeth_l3_setdelip_cb(struct qeth_card *card, struct qeth_reply *reply, + unsigned long data) +{ + struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *) data; + + switch (cmd->hdr.return_code) { + case IPA_RC_SUCCESS: + return 0; + case IPA_RC_DUPLICATE_IP_ADDRESS: + return -EADDRINUSE; + case IPA_RC_MC_ADDR_NOT_FOUND: + return -ENOENT; + case IPA_RC_LAN_OFFLINE: + return -ENETDOWN; + default: + return -EIO; + } +} + static int qeth_l3_send_setdelmc(struct qeth_card *card, struct qeth_ipaddr *addr, int ipacmd) { - int rc; struct qeth_cmd_buffer *iob; struct qeth_ipa_cmd *cmd; @@ -358,9 +375,7 @@ static int qeth_l3_send_setdelmc(struct qeth_card *card, else memcpy(&cmd->data.setdelipm.ip4, &addr->u.a4.addr, 4); - rc = qeth_send_ipa_cmd(card, iob, NULL, NULL); - - return rc; + return qeth_send_ipa_cmd(card, iob, qeth_l3_setdelip_cb, NULL); } static void qeth_l3_fill_netmask(u8 *netmask, unsigned int len) @@ -422,7 +437,7 @@ static int qeth_l3_send_setdelip(struct qeth_card *card, cmd->data.setdelip4.flags = flags; } - return qeth_send_ipa_cmd(card, iob, NULL, NULL); + return qeth_send_ipa_cmd(card, iob, qeth_l3_setdelip_cb, NULL); } static int qeth_l3_send_setrouting(struct qeth_card *card, @@ -1481,14 +1496,14 @@ static void qeth_l3_set_rx_mode(struct net_device *dev) switch (addr->disp_flag) { case QETH_DISP_ADDR_DELETE: rc = qeth_l3_deregister_addr_entry(card, addr); - if (!rc || rc == IPA_RC_MC_ADDR_NOT_FOUND) { + if (!rc || rc == -ENOENT) { hash_del(&addr->hnode); kfree(addr); } break; case QETH_DISP_ADDR_ADD: rc = qeth_l3_register_addr_entry(card, addr); - if (rc && rc != IPA_RC_LAN_OFFLINE) { + if (rc && rc != -ENETDOWN) { hash_del(&addr->hnode); kfree(addr); break; @@ -1599,7 +1614,6 @@ static int qeth_l3_arp_query_cb(struct qeth_card *card, struct qeth_ipa_cmd *cmd; struct qeth_arp_query_data *qdata; struct qeth_arp_query_info *qinfo; - int i; int e; int entrybytes_done; int stripped_bytes; @@ -1613,13 +1627,13 @@ static int qeth_l3_arp_query_cb(struct qeth_card *card, if (cmd->hdr.return_code) { QETH_CARD_TEXT(card, 4, "arpcberr"); QETH_CARD_TEXT_(card, 4, "%i", cmd->hdr.return_code); - return 0; + return qeth_l3_arp_makerc(cmd->hdr.return_code); } if (cmd->data.setassparms.hdr.return_code) { cmd->hdr.return_code = cmd->data.setassparms.hdr.return_code; QETH_CARD_TEXT(card, 4, "setaperr"); QETH_CARD_TEXT_(card, 4, "%i", cmd->hdr.return_code); - return 0; + return qeth_l3_arp_makerc(cmd->hdr.return_code); } qdata = &cmd->data.setassparms.data.query_arp; QETH_CARD_TEXT_(card, 4, "anoen%i", qdata->no_entries); @@ -1646,9 +1660,9 @@ static int qeth_l3_arp_query_cb(struct qeth_card *card, break; if ((qinfo->udata_len - qinfo->udata_offset) < esize) { - QETH_CARD_TEXT_(card, 4, "qaer3%i", -ENOMEM); - cmd->hdr.return_code = IPA_RC_ENOMEM; - goto out_error; + QETH_CARD_TEXT_(card, 4, "qaer3%i", -ENOSPC); + memset(qinfo->udata, 0, 4); + return -ENOSPC; } memcpy(qinfo->udata + qinfo->udata_offset, @@ -1671,10 +1685,6 @@ static int qeth_l3_arp_query_cb(struct qeth_card *card, memcpy(qinfo->udata + QETH_QARP_MASK_OFFSET, &qdata->reply_bits, 2); QETH_CARD_TEXT_(card, 4, "rc%i", 0); return 0; -out_error: - i = 0; - memcpy(qinfo->udata, &i, 4); - return 0; } static int qeth_l3_query_arp_cache_info(struct qeth_card *card, @@ -1700,7 +1710,7 @@ static int qeth_l3_query_arp_cache_info(struct qeth_card *card, if (rc) QETH_DBF_MESSAGE(2, "Error while querying ARP cache on device %x: %#x\n", CARD_DEVID(card), rc); - return qeth_l3_arp_makerc(rc); + return rc; } static int qeth_l3_arp_query(struct qeth_card *card, char __user *udata) -- cgit v1.2.3