Commit c8431622 authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 's390-qeth-fixes' 



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: default avatarDavid S. Miller <davem@davemloft.net>
parents 590399dd d22ffb5a

drivers/s390/net/qeth_core_main.c

+16 −13
Original line number Diff line number Diff line
@@ -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;
@@ -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)
@@ -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 "

drivers/s390/net/qeth_l3.h

+33 −1
Original line number Diff line number Diff line
@@ -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;

drivers/s390/net/qeth_l3_main.c

+53 −70
Original line number Diff line number Diff line
@@ -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;
@@ -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;
@@ -162,22 +152,17 @@ 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;

	}



	if (qeth_card_hw_is_reachable(card))

		rc = qeth_l3_deregister_addr_entry(card, addr);



	hash_del(&addr->hnode);
@@ -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");
@@ -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;
@@ -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;

}
@@ -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);
@@ -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);



	spin_unlock_bh(&card->ip_lock);



	kfree(ipaddr);
@@ -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);



	spin_unlock_bh(&card->ip_lock);



	kfree(ipaddr);
@@ -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);
@@ -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;

		}
@@ -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,

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