Commit 356156b6 authored by Julian Wiedmann's avatar Julian Wiedmann Committed by David S. Miller
Browse files

s390/qeth: speed up TSO transmission 



Switch TSO over to the faster transmit path, and remove all the unused
old TSO code.

Signed-off-by: default avatarJulian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e517b649

drivers/s390/net/qeth_core.h

+0 −1
Original line number Diff line number Diff line
@@ -1004,7 +1004,6 @@ int qeth_send_control_data(struct qeth_card *, int, struct qeth_cmd_buffer *, 
	int (*reply_cb)(struct qeth_card *, struct qeth_reply*, unsigned long),

	void *reply_param);

unsigned int qeth_count_elements(struct sk_buff *skb, unsigned int data_offset);

int qeth_get_elements_for_frags(struct sk_buff *);

int qeth_do_send_packet_fast(struct qeth_qdio_out_q *queue, struct sk_buff *skb,

			     struct qeth_hdr *hdr, unsigned int offset,

			     unsigned int hd_len);

drivers/s390/net/qeth_core_main.c

+1 −2
Original line number Diff line number Diff line
@@ -3788,7 +3788,7 @@ EXPORT_SYMBOL_GPL(qeth_get_priority_queue); 
 * Returns the number of pages, and thus QDIO buffer elements, needed to cover

 * fragmented part of the SKB. Returns zero for linear SKB.

 */

int qeth_get_elements_for_frags(struct sk_buff *skb)

static int qeth_get_elements_for_frags(struct sk_buff *skb)

{

	int cnt, elements = 0;
@@ -3801,7 +3801,6 @@ int qeth_get_elements_for_frags(struct sk_buff *skb) 
	}

	return elements;

}

EXPORT_SYMBOL_GPL(qeth_get_elements_for_frags);



/**

 * qeth_count_elements() -	Counts the number of QDIO buffer elements needed

drivers/s390/net/qeth_l3_main.c

+5 −146
Original line number Diff line number Diff line
@@ -33,7 +33,6 @@ 
#include <net/ipv6.h>

#include <net/ip6_route.h>

#include <net/ip6_fib.h>

#include <net/ip6_checksum.h>

#include <net/iucv/af_iucv.h>

#include <linux/hashtable.h>
@@ -2118,70 +2117,6 @@ static void qeth_l3_fill_tso_ext(struct qeth_hdr_tso *hdr, 
	ext->dg_hdr_len = proto_len;

}



static void qeth_tso_fill_header(struct qeth_card *card,

		struct qeth_hdr *qhdr, struct sk_buff *skb)

{

	struct qeth_hdr_tso *hdr = (struct qeth_hdr_tso *)qhdr;

	struct tcphdr *tcph = tcp_hdr(skb);

	struct iphdr *iph = ip_hdr(skb);

	struct ipv6hdr *ip6h = ipv6_hdr(skb);



	/*set values which are fix for the first approach ...*/

	hdr->ext.hdr_tot_len = (__u16) sizeof(struct qeth_hdr_ext_tso);

	hdr->ext.imb_hdr_no  = 1;

	hdr->ext.hdr_type    = 1;

	hdr->ext.hdr_version = 1;

	hdr->ext.hdr_len     = 28;

	/*insert non-fix values */

	hdr->ext.mss = skb_shinfo(skb)->gso_size;

	hdr->ext.dg_hdr_len = (__u16)(ip_hdrlen(skb) + tcp_hdrlen(skb));

	hdr->ext.payload_len = (__u16)(skb->len - hdr->ext.dg_hdr_len -

				       sizeof(struct qeth_hdr_tso));

	tcph->check = 0;

	if (be16_to_cpu(skb->protocol) == ETH_P_IPV6) {

		ip6h->payload_len = 0;

		tcph->check = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,

					       0, IPPROTO_TCP, 0);

	} else {

		/*OSA want us to set these values ...*/

		tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,

					 0, IPPROTO_TCP, 0);

		iph->tot_len = 0;

		iph->check = 0;

	}

}



/**

 * qeth_l3_get_elements_no_tso() - find number of SBALEs for skb data for tso

 * @card:			   qeth card structure, to check max. elems.

 * @skb:			   SKB address

 * @extra_elems:		   extra elems needed, to check against max.

 *

 * Returns the number of pages, and thus QDIO buffer elements, needed to cover

 * skb data, including linear part and fragments, but excluding TCP header.

 * Checks if the result plus extra_elems fits under the limit for the card.

 * Returns 0 if it does not.

 * Note: extra_elems is not included in the returned result.

 */

static int qeth_l3_get_elements_no_tso(struct qeth_card *card,

			struct sk_buff *skb, int extra_elems)

{

	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,

	"Invalid size of TSO IP packet (Number=%d / Length=%d). Discarded.\n",

				elements + extra_elems, skb->len);

		return 0;

	}

	return elements;

}



static void qeth_l3_fixup_headers(struct sk_buff *skb)

{

	struct iphdr *iph = ip_hdr(skb);
@@ -2196,9 +2131,8 @@ static void qeth_l3_fixup_headers(struct sk_buff *skb) 
	}

}



static int qeth_l3_xmit_offload(struct qeth_card *card, struct sk_buff *skb,

				struct qeth_qdio_out_q *queue, int ipv,

				int cast_type)

static int qeth_l3_xmit(struct qeth_card *card, struct sk_buff *skb,

			struct qeth_qdio_out_q *queue, int ipv, int cast_type)

{

	unsigned int hw_hdr_len, proto_len, frame_len, elements;

	unsigned char eth_hdr[ETH_HLEN];
@@ -2282,81 +2216,6 @@ static int qeth_l3_xmit_offload(struct qeth_card *card, struct sk_buff *skb, 
	return rc;

}



static int qeth_l3_xmit(struct qeth_card *card, struct sk_buff *skb,

			struct qeth_qdio_out_q *queue, int ipv, int cast_type)

{

	struct qeth_hdr *hdr = NULL;

	struct sk_buff *new_skb = NULL;

	int tx_bytes = skb->len;

	unsigned int hd_len;

	int elements, rc;

	bool is_sg;



	/* create a clone with writeable headroom */

	new_skb = skb_realloc_headroom(skb, sizeof(struct qeth_hdr_tso));

	if (!new_skb)

		return -ENOMEM;



	skb_pull(new_skb, ETH_HLEN);



	/* fix hardware limitation: as long as we do not have sbal

	 * chaining we can not send long frag lists

	 */

	if (!qeth_l3_get_elements_no_tso(card, new_skb, 1)) {

		rc = skb_linearize(new_skb);



		if (card->options.performance_stats) {

			if (rc)

				card->perf_stats.tx_linfail++;

			else

				card->perf_stats.tx_lin++;

		}

		if (rc)

			goto out;

	}



	hdr = skb_push(new_skb, sizeof(struct qeth_hdr_tso));

	memset(hdr, 0, sizeof(struct qeth_hdr_tso));

	qeth_l3_fill_header(card, hdr, new_skb, ipv, cast_type,

			    new_skb->len - sizeof(struct qeth_hdr_tso));

	qeth_tso_fill_header(card, hdr, new_skb);



	elements = qeth_l3_get_elements_no_tso(card, new_skb, 1);

	if (!elements) {

		rc = -E2BIG;

		goto out;

	}

	elements++;



	hd_len = sizeof(struct qeth_hdr_tso) + ip_hdrlen(new_skb) +

		 tcp_hdrlen(new_skb);



	if (qeth_hdr_chk_and_bounce(new_skb, &hdr, hd_len)) {

		rc = -EINVAL;

		goto out;

	}



	is_sg = skb_is_nonlinear(new_skb);

	rc = qeth_do_send_packet(card, queue, new_skb, hdr, hd_len, hd_len,

				 elements);

out:

	if (!rc) {

		if (new_skb != skb)

			dev_kfree_skb_any(skb);

		if (card->options.performance_stats) {

			card->perf_stats.buf_elements_sent += elements;

			if (is_sg)

				card->perf_stats.sg_skbs_sent++;

			card->perf_stats.large_send_bytes += tx_bytes;

			card->perf_stats.large_send_cnt++;

		}

	} else {

		if (new_skb != skb)

			dev_kfree_skb_any(new_skb);

	}

	return rc;

}



static netdev_tx_t qeth_l3_hard_start_xmit(struct sk_buff *skb,

					   struct net_device *dev)

{
@@ -2392,9 +2251,7 @@ static netdev_tx_t qeth_l3_hard_start_xmit(struct sk_buff *skb, 
	}

	netif_stop_queue(dev);



	if (IS_IQD(card) || (!skb_is_gso(skb) && ipv == 4))

		rc = qeth_l3_xmit_offload(card, skb, queue, ipv, cast_type);

	else if (skb_is_gso(skb))

	if (ipv == 4 || IS_IQD(card))

		rc = qeth_l3_xmit(card, skb, queue, ipv, cast_type);

	else

		rc = qeth_xmit(card, skb, queue, ipv, cast_type,
@@ -2560,6 +2417,8 @@ static int qeth_l3_setup_netdev(struct qeth_card *card) 
		card->dev->needed_headroom = sizeof(struct qeth_hdr);

		/* allow for de-acceleration of NETIF_F_HW_VLAN_CTAG_TX: */

		card->dev->needed_headroom += VLAN_HLEN;

		if (qeth_is_supported(card, IPA_OUTBOUND_TSO))

			card->dev->needed_headroom = sizeof(struct qeth_hdr_tso);



		/*IPv6 address autoconfiguration stuff*/

		qeth_l3_get_unique_id(card);

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