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Merge branch 's390-qeth-fixes'
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Julian Wiedmann says:

====================
s390/qeth: fixes 2018-02-27

please apply some more qeth patches for -net and stable.

One patch fixes a performance bug in the TSO path. Then there's several
more fixes for IP management on L3 devices - including a revert, so that
the subsequent fix cleanly applies to earlier kernels.
The final patch takes care of a race in the control IO code that causes
qeth to miss the cmd response, and subsequently trigger device recovery.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
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@davem330
davem330 committed Feb 28, 2018
2 parents 590399d + d22ffb5 commit c843162
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Showing 3 changed files with 102 additions and 84 deletions.
29 changes: 16 additions & 13 deletions drivers/s390/net/qeth_core_main.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2134,24 +2134,25 @@ int qeth_send_control_data(struct qeth_card *card, int len,
}
reply->callback = reply_cb;
reply->param = reply_param;
if (card->state == CARD_STATE_DOWN)
reply->seqno = QETH_IDX_COMMAND_SEQNO;
else
reply->seqno = card->seqno.ipa++;

init_waitqueue_head(&reply->wait_q);
spin_lock_irqsave(&card->lock, flags);
list_add_tail(&reply->list, &card->cmd_waiter_list);
spin_unlock_irqrestore(&card->lock, flags);

while (atomic_cmpxchg(&card->write.irq_pending, 0, 1)) ;
qeth_prepare_control_data(card, len, iob);

if (IS_IPA(iob->data)) {
cmd = __ipa_cmd(iob);
cmd->hdr.seqno = card->seqno.ipa++;
reply->seqno = cmd->hdr.seqno;
event_timeout = QETH_IPA_TIMEOUT;
} else {
reply->seqno = QETH_IDX_COMMAND_SEQNO;
event_timeout = QETH_TIMEOUT;
}
qeth_prepare_control_data(card, len, iob);

spin_lock_irqsave(&card->lock, flags);
list_add_tail(&reply->list, &card->cmd_waiter_list);
spin_unlock_irqrestore(&card->lock, flags);

timeout = jiffies + event_timeout;

Expand Down Expand Up @@ -2933,7 +2934,7 @@ static void qeth_fill_ipacmd_header(struct qeth_card *card,
memset(cmd, 0, sizeof(struct qeth_ipa_cmd));
cmd->hdr.command = command;
cmd->hdr.initiator = IPA_CMD_INITIATOR_HOST;
cmd->hdr.seqno = card->seqno.ipa;
/* cmd->hdr.seqno is set by qeth_send_control_data() */
cmd->hdr.adapter_type = qeth_get_ipa_adp_type(card->info.link_type);
cmd->hdr.rel_adapter_no = (__u8) card->info.portno;
if (card->options.layer2)
Expand Down Expand Up @@ -3898,10 +3899,12 @@ EXPORT_SYMBOL_GPL(qeth_get_elements_for_frags);
int qeth_get_elements_no(struct qeth_card *card,
struct sk_buff *skb, int extra_elems, int data_offset)
{
int elements = qeth_get_elements_for_range(
(addr_t)skb->data + data_offset,
(addr_t)skb->data + skb_headlen(skb)) +
qeth_get_elements_for_frags(skb);
addr_t end = (addr_t)skb->data + skb_headlen(skb);
int elements = qeth_get_elements_for_frags(skb);
addr_t start = (addr_t)skb->data + data_offset;

if (start != end)
elements += qeth_get_elements_for_range(start, end);

if ((elements + extra_elems) > QETH_MAX_BUFFER_ELEMENTS(card)) {
QETH_DBF_MESSAGE(2, "Invalid size of IP packet "
Expand Down
34 changes: 33 additions & 1 deletion drivers/s390/net/qeth_l3.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -40,8 +40,40 @@ struct qeth_ipaddr {
unsigned int pfxlen;
} a6;
} u;

};

static inline bool qeth_l3_addr_match_ip(struct qeth_ipaddr *a1,
struct qeth_ipaddr *a2)
{
if (a1->proto != a2->proto)
return false;
if (a1->proto == QETH_PROT_IPV6)
return ipv6_addr_equal(&a1->u.a6.addr, &a2->u.a6.addr);
return a1->u.a4.addr == a2->u.a4.addr;
}

static inline bool qeth_l3_addr_match_all(struct qeth_ipaddr *a1,
struct qeth_ipaddr *a2)
{
/* Assumes that the pair was obtained via qeth_l3_addr_find_by_ip(),
* so 'proto' and 'addr' match for sure.
*
* For ucast:
* - 'mac' is always 0.
* - 'mask'/'pfxlen' for RXIP/VIPA is always 0. For NORMAL, matching
* values are required to avoid mixups in takeover eligibility.
*
* For mcast,
* - 'mac' is mapped from the IP, and thus always matches.
* - 'mask'/'pfxlen' is always 0.
*/
if (a1->type != a2->type)
return false;
if (a1->proto == QETH_PROT_IPV6)
return a1->u.a6.pfxlen == a2->u.a6.pfxlen;
return a1->u.a4.mask == a2->u.a4.mask;
}

static inline u64 qeth_l3_ipaddr_hash(struct qeth_ipaddr *addr)
{
u64 ret = 0;
Expand Down
123 changes: 53 additions & 70 deletions drivers/s390/net/qeth_l3_main.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,24 @@ void qeth_l3_ipaddr_to_string(enum qeth_prot_versions proto, const __u8 *addr,
qeth_l3_ipaddr6_to_string(addr, buf);
}

static struct qeth_ipaddr *qeth_l3_find_addr_by_ip(struct qeth_card *card,
struct qeth_ipaddr *query)
{
u64 key = qeth_l3_ipaddr_hash(query);
struct qeth_ipaddr *addr;

if (query->is_multicast) {
hash_for_each_possible(card->ip_mc_htable, addr, hnode, key)
if (qeth_l3_addr_match_ip(addr, query))
return addr;
} else {
hash_for_each_possible(card->ip_htable, addr, hnode, key)
if (qeth_l3_addr_match_ip(addr, query))
return addr;
}
return NULL;
}

static void qeth_l3_convert_addr_to_bits(u8 *addr, u8 *bits, int len)
{
int i, j;
Expand Down Expand Up @@ -120,34 +138,6 @@ static bool qeth_l3_is_addr_covered_by_ipato(struct qeth_card *card,
return rc;
}

inline int
qeth_l3_ipaddrs_is_equal(struct qeth_ipaddr *addr1, struct qeth_ipaddr *addr2)
{
return addr1->proto == addr2->proto &&
!memcmp(&addr1->u, &addr2->u, sizeof(addr1->u)) &&
ether_addr_equal_64bits(addr1->mac, addr2->mac);
}

static struct qeth_ipaddr *
qeth_l3_ip_from_hash(struct qeth_card *card, struct qeth_ipaddr *tmp_addr)
{
struct qeth_ipaddr *addr;

if (tmp_addr->is_multicast) {
hash_for_each_possible(card->ip_mc_htable, addr,
hnode, qeth_l3_ipaddr_hash(tmp_addr))
if (qeth_l3_ipaddrs_is_equal(tmp_addr, addr))
return addr;
} else {
hash_for_each_possible(card->ip_htable, addr,
hnode, qeth_l3_ipaddr_hash(tmp_addr))
if (qeth_l3_ipaddrs_is_equal(tmp_addr, addr))
return addr;
}

return NULL;
}

int qeth_l3_delete_ip(struct qeth_card *card, struct qeth_ipaddr *tmp_addr)
{
int rc = 0;
Expand All @@ -162,23 +152,18 @@ int qeth_l3_delete_ip(struct qeth_card *card, struct qeth_ipaddr *tmp_addr)
QETH_CARD_HEX(card, 4, ((char *)&tmp_addr->u.a6.addr) + 8, 8);
}

addr = qeth_l3_ip_from_hash(card, tmp_addr);
if (!addr)
addr = qeth_l3_find_addr_by_ip(card, tmp_addr);
if (!addr || !qeth_l3_addr_match_all(addr, tmp_addr))
return -ENOENT;

addr->ref_counter--;
if (addr->ref_counter > 0 && (addr->type == QETH_IP_TYPE_NORMAL ||
addr->type == QETH_IP_TYPE_RXIP))
if (addr->type == QETH_IP_TYPE_NORMAL && addr->ref_counter > 0)
return rc;
if (addr->in_progress)
return -EINPROGRESS;

if (!qeth_card_hw_is_reachable(card)) {
addr->disp_flag = QETH_DISP_ADDR_DELETE;
return 0;
}

rc = qeth_l3_deregister_addr_entry(card, addr);
if (qeth_card_hw_is_reachable(card))
rc = qeth_l3_deregister_addr_entry(card, addr);

hash_del(&addr->hnode);
kfree(addr);
Expand All @@ -190,6 +175,7 @@ int qeth_l3_add_ip(struct qeth_card *card, struct qeth_ipaddr *tmp_addr)
{
int rc = 0;
struct qeth_ipaddr *addr;
char buf[40];

QETH_CARD_TEXT(card, 4, "addip");

Expand All @@ -200,8 +186,20 @@ int qeth_l3_add_ip(struct qeth_card *card, struct qeth_ipaddr *tmp_addr)
QETH_CARD_HEX(card, 4, ((char *)&tmp_addr->u.a6.addr) + 8, 8);
}

addr = qeth_l3_ip_from_hash(card, tmp_addr);
if (!addr) {
addr = qeth_l3_find_addr_by_ip(card, tmp_addr);
if (addr) {
if (tmp_addr->type != QETH_IP_TYPE_NORMAL)
return -EADDRINUSE;
if (qeth_l3_addr_match_all(addr, tmp_addr)) {
addr->ref_counter++;
return 0;
}
qeth_l3_ipaddr_to_string(tmp_addr->proto, (u8 *)&tmp_addr->u,
buf);
dev_warn(&card->gdev->dev,
"Registering IP address %s failed\n", buf);
return -EADDRINUSE;
} else {
addr = qeth_l3_get_addr_buffer(tmp_addr->proto);
if (!addr)
return -ENOMEM;
Expand Down Expand Up @@ -241,19 +239,15 @@ int qeth_l3_add_ip(struct qeth_card *card, struct qeth_ipaddr *tmp_addr)
(rc == IPA_RC_LAN_OFFLINE)) {
addr->disp_flag = QETH_DISP_ADDR_DO_NOTHING;
if (addr->ref_counter < 1) {
qeth_l3_delete_ip(card, addr);
qeth_l3_deregister_addr_entry(card, addr);
hash_del(&addr->hnode);
kfree(addr);
}
} else {
hash_del(&addr->hnode);
kfree(addr);
}
} else {
if (addr->type == QETH_IP_TYPE_NORMAL ||
addr->type == QETH_IP_TYPE_RXIP)
addr->ref_counter++;
}

return rc;
}

Expand Down Expand Up @@ -321,11 +315,7 @@ static void qeth_l3_recover_ip(struct qeth_card *card)
spin_lock_bh(&card->ip_lock);

hash_for_each_safe(card->ip_htable, i, tmp, addr, hnode) {
if (addr->disp_flag == QETH_DISP_ADDR_DELETE) {
qeth_l3_deregister_addr_entry(card, addr);
hash_del(&addr->hnode);
kfree(addr);
} else if (addr->disp_flag == QETH_DISP_ADDR_ADD) {
if (addr->disp_flag == QETH_DISP_ADDR_ADD) {
if (addr->proto == QETH_PROT_IPV4) {
addr->in_progress = 1;
spin_unlock_bh(&card->ip_lock);
Expand Down Expand Up @@ -643,12 +633,7 @@ int qeth_l3_add_vipa(struct qeth_card *card, enum qeth_prot_versions proto,
return -ENOMEM;

spin_lock_bh(&card->ip_lock);

if (qeth_l3_ip_from_hash(card, ipaddr))
rc = -EEXIST;
else
rc = qeth_l3_add_ip(card, ipaddr);

rc = qeth_l3_add_ip(card, ipaddr);
spin_unlock_bh(&card->ip_lock);

kfree(ipaddr);
Expand Down Expand Up @@ -713,12 +698,7 @@ int qeth_l3_add_rxip(struct qeth_card *card, enum qeth_prot_versions proto,
return -ENOMEM;

spin_lock_bh(&card->ip_lock);

if (qeth_l3_ip_from_hash(card, ipaddr))
rc = -EEXIST;
else
rc = qeth_l3_add_ip(card, ipaddr);

rc = qeth_l3_add_ip(card, ipaddr);
spin_unlock_bh(&card->ip_lock);

kfree(ipaddr);
Expand Down Expand Up @@ -1239,8 +1219,9 @@ qeth_l3_add_mc_to_hash(struct qeth_card *card, struct in_device *in4_dev)
tmp->u.a4.addr = be32_to_cpu(im4->multiaddr);
tmp->is_multicast = 1;

ipm = qeth_l3_ip_from_hash(card, tmp);
ipm = qeth_l3_find_addr_by_ip(card, tmp);
if (ipm) {
/* for mcast, by-IP match means full match */
ipm->disp_flag = QETH_DISP_ADDR_DO_NOTHING;
} else {
ipm = qeth_l3_get_addr_buffer(QETH_PROT_IPV4);
Expand Down Expand Up @@ -1319,8 +1300,9 @@ static void qeth_l3_add_mc6_to_hash(struct qeth_card *card,
sizeof(struct in6_addr));
tmp->is_multicast = 1;

ipm = qeth_l3_ip_from_hash(card, tmp);
ipm = qeth_l3_find_addr_by_ip(card, tmp);
if (ipm) {
/* for mcast, by-IP match means full match */
ipm->disp_flag = QETH_DISP_ADDR_DO_NOTHING;
continue;
}
Expand Down Expand Up @@ -2450,11 +2432,12 @@ static void qeth_tso_fill_header(struct qeth_card *card,
static int qeth_l3_get_elements_no_tso(struct qeth_card *card,
struct sk_buff *skb, int extra_elems)
{
addr_t tcpdptr = (addr_t)tcp_hdr(skb) + tcp_hdrlen(skb);
int elements = qeth_get_elements_for_range(
tcpdptr,
(addr_t)skb->data + skb_headlen(skb)) +
qeth_get_elements_for_frags(skb);
addr_t start = (addr_t)tcp_hdr(skb) + tcp_hdrlen(skb);
addr_t end = (addr_t)skb->data + skb_headlen(skb);
int elements = qeth_get_elements_for_frags(skb);

if (start != end)
elements += qeth_get_elements_for_range(start, end);

if ((elements + extra_elems) > QETH_MAX_BUFFER_ELEMENTS(card)) {
QETH_DBF_MESSAGE(2,
Expand Down

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