s390: scatter-gather for inbound traffic in qeth driver

For large incoming packets > PAGE_SIZE/2 qeth creates a fragmented skb
by adding pointers to qdio pages to the fragment list of the skb.
This avoids allocating big chunks of consecutive memory. Also copying
data from the qdio buffer to the skb is economized.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Frank Pavlic <fpavlic@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 150 insertions, 32 deletions

diff --git a/drivers/s390/net/qeth_main.c b/drivers/s390/net/qeth_main.c
index 86b0c44165c1..8dca93598ea3 100644
--- a/drivers/s390/net/qeth_main.c
+++ b/drivers/s390/net/qeth_main.c
@@ -1054,6 +1054,7 @@ qeth_set_intial_options(struct qeth_card *card)
         else
                 card->options.layer2 = 0;
         card->options.performance_stats = 0;
+        card->options.rx_sg_cb = QETH_RX_SG_CB;
 }
 
 /**
@@ -2258,6 +2259,89 @@ qeth_get_skb(unsigned int length, struct qeth_hdr *hdr)
         return skb;
 }
 
+static inline int
+qeth_create_skb_frag(struct qdio_buffer_element *element,
+                     struct sk_buff **pskb,
+                     int offset, int *pfrag, int data_len)
+{
+        struct page *page = virt_to_page(element->addr);
+        if (*pfrag == 0) {
+                /* the upper protocol layers assume that there is data in the
+                 * skb itself. Copy a small amount (64 bytes) to make them
+                 * happy. */
+                *pskb = dev_alloc_skb(64 + QETH_FAKE_LL_LEN_ETH);
+                if (!(*pskb))
+                        return -ENOMEM;
+                skb_reserve(*pskb, QETH_FAKE_LL_LEN_ETH);
+                if (data_len <= 64) {
+                        memcpy(skb_put(*pskb, data_len), element->addr + offset,
+                                data_len);
+                } else {
+                        get_page(page);
+                        memcpy(skb_put(*pskb, 64), element->addr + offset, 64);
+                        skb_fill_page_desc(*pskb, *pfrag, page, offset + 64,
+                                data_len - 64);
+                        (*pskb)->data_len += data_len - 64;
+                        (*pskb)->len      += data_len - 64;
+                        (*pskb)->truesize += data_len - 64;
+                }
+        } else {
+                get_page(page);
+                skb_fill_page_desc(*pskb, *pfrag, page, offset, data_len);
+                (*pskb)->data_len += data_len;
+                (*pskb)->len      += data_len;
+                (*pskb)->truesize += data_len;
+        }
+        (*pfrag)++;
+        return 0;
+}
+
+static inline struct qeth_buffer_pool_entry *
+qeth_find_free_buffer_pool_entry(struct qeth_card *card)
+{
+        struct list_head *plh;
+        struct qeth_buffer_pool_entry *entry;
+        int i, free;
+        struct page *page;
+
+        if (list_empty(&card->qdio.in_buf_pool.entry_list))
+                return NULL;
+
+        list_for_each(plh, &card->qdio.in_buf_pool.entry_list) {
+                entry = list_entry(plh, struct qeth_buffer_pool_entry, list);
+                free = 1;
+                for (i = 0; i < QETH_MAX_BUFFER_ELEMENTS(card); ++i) {
+                        if (page_count(virt_to_page(entry->elements[i])) > 1) {
+                                free = 0;
+                                break;
+                        }
+                }
+                if (free) {
+                        list_del_init(&entry->list);
+                        return entry;
+                }
+        }
+
+        /* no free buffer in pool so take first one and swap pages */
+        entry = list_entry(card->qdio.in_buf_pool.entry_list.next,
+                        struct qeth_buffer_pool_entry, list);
+        for (i = 0; i < QETH_MAX_BUFFER_ELEMENTS(card); ++i) {
+                if (page_count(virt_to_page(entry->elements[i])) > 1) {
+                        page = alloc_page(GFP_ATOMIC|GFP_DMA);
+                        if (!page) {
+                                return NULL;
+                        } else {
+                                free_page((unsigned long)entry->elements[i]);
+                                entry->elements[i] = page_address(page);
+                                if (card->options.performance_stats)
+                                        card->perf_stats.sg_alloc_page_rx++;
+                        }
+                }
+        }
+        list_del_init(&entry->list);
+        return entry;
+}
+
 static struct sk_buff *
 qeth_get_next_skb(struct qeth_card *card, struct qdio_buffer *buffer,
                   struct qdio_buffer_element **__element, int *__offset,
@@ -2269,6 +2353,8 @@ qeth_get_next_skb(struct qeth_card *card, struct qdio_buffer *buffer,
         int skb_len;
         void *data_ptr;
         int data_len;
+        int use_rx_sg = 0;
+        int frag = 0;
 
         QETH_DBF_TEXT(trace,6,"nextskb");
         /* qeth_hdr must not cross element boundaries */
@@ -2293,23 +2379,43 @@ qeth_get_next_skb(struct qeth_card *card, struct qdio_buffer *buffer,
 
         if (!skb_len)
                 return NULL;
-        if (card->options.fake_ll){
-                if(card->dev->type == ARPHRD_IEEE802_TR){
-                        if (!(skb = qeth_get_skb(skb_len+QETH_FAKE_LL_LEN_TR, *hdr)))
-                                goto no_mem;
-                        skb_reserve(skb,QETH_FAKE_LL_LEN_TR);
+        if ((skb_len >= card->options.rx_sg_cb) &&
+            (!(card->info.type == QETH_CARD_TYPE_OSN)) &&
+            (!atomic_read(&card->force_alloc_skb))) {
+                use_rx_sg = 1;
+        } else {
+                if (card->options.fake_ll) {
+                        if (card->dev->type == ARPHRD_IEEE802_TR) {
+                                if (!(skb = qeth_get_skb(skb_len +
+                                                QETH_FAKE_LL_LEN_TR, *hdr)))
+                                        goto no_mem;
+                                skb_reserve(skb, QETH_FAKE_LL_LEN_TR);
+                        } else {
+                                if (!(skb = qeth_get_skb(skb_len +
+                                                QETH_FAKE_LL_LEN_ETH, *hdr)))
+                                        goto no_mem;
+                                skb_reserve(skb, QETH_FAKE_LL_LEN_ETH);
+                        }
                 } else {
-                        if (!(skb = qeth_get_skb(skb_len+QETH_FAKE_LL_LEN_ETH, *hdr)))
+                        skb = qeth_get_skb(skb_len, *hdr);
+                        if (!skb)
                                 goto no_mem;
-                        skb_reserve(skb,QETH_FAKE_LL_LEN_ETH);
                 }
-        } else if (!(skb = qeth_get_skb(skb_len, *hdr)))
-                goto no_mem;
+        }
+
         data_ptr = element->addr + offset;
         while (skb_len) {
                 data_len = min(skb_len, (int)(element->length - offset));
-                if (data_len)
-                        memcpy(skb_put(skb, data_len), data_ptr, data_len);
+                if (data_len) {
+                        if (use_rx_sg) {
+                                if (qeth_create_skb_frag(element, &skb, offset,
+                                    &frag, data_len))
+                                        goto no_mem;
+                        } else {
+                                memcpy(skb_put(skb, data_len), data_ptr,
+                                        data_len);
+                        }
+                }
                 skb_len -= data_len;
                 if (skb_len){
                         if (qeth_is_last_sbale(element)){
@@ -2331,6 +2437,10 @@ qeth_get_next_skb(struct qeth_card *card, struct qdio_buffer *buffer,
         }
         *__element = element;
         *__offset = offset;
+        if (use_rx_sg && card->options.performance_stats) {
+                card->perf_stats.sg_skbs_rx++;
+                card->perf_stats.sg_frags_rx += skb_shinfo(skb)->nr_frags;
+        }
         return skb;
 no_mem:
         if (net_ratelimit()){
@@ -2608,28 +2718,15 @@ qeth_process_inbound_buffer(struct qeth_card *card,
         }
 }
 
-static struct qeth_buffer_pool_entry *
-qeth_get_buffer_pool_entry(struct qeth_card *card)
-{
-        struct qeth_buffer_pool_entry *entry;
-
-        QETH_DBF_TEXT(trace, 6, "gtbfplen");
-        if (!list_empty(&card->qdio.in_buf_pool.entry_list)) {
-                entry = list_entry(card->qdio.in_buf_pool.entry_list.next,
-                                struct qeth_buffer_pool_entry, list);
-                list_del_init(&entry->list);
-                return entry;
-        }
-        return NULL;
-}
-
-static void
+static int
 qeth_init_input_buffer(struct qeth_card *card, struct qeth_qdio_buffer *buf)
 {
         struct qeth_buffer_pool_entry *pool_entry;
         int i;
- 
-        pool_entry = qeth_get_buffer_pool_entry(card);
+
+        pool_entry = qeth_find_free_buffer_pool_entry(card);
+        if (!pool_entry)
+                return 1;
         /*
          * since the buffer is accessed only from the input_tasklet
          * there shouldn't be a need to synchronize; also, since we use
@@ -2648,6 +2745,7 @@ qeth_init_input_buffer(struct qeth_card *card, struct qeth_qdio_buffer *buf)
                         buf->buffer->element[i].flags = 0;
         }
         buf->state = QETH_QDIO_BUF_EMPTY;
+        return 0;
 }
 
 static void
@@ -2682,6 +2780,7 @@ qeth_queue_input_buffer(struct qeth_card *card, int index)
         int count;
         int i;
         int rc;
+        int newcount = 0;
 
         QETH_DBF_TEXT(trace,6,"queinbuf");
         count = (index < queue->next_buf_to_init)?
@@ -2692,9 +2791,27 @@ qeth_queue_input_buffer(struct qeth_card *card, int index)
         /* only requeue at a certain threshold to avoid SIGAs */
         if (count >= QETH_IN_BUF_REQUEUE_THRESHOLD(card)){
                 for (i = queue->next_buf_to_init;
-                     i < queue->next_buf_to_init + count; ++i)
-                        qeth_init_input_buffer(card,
-                                &queue->bufs[i % QDIO_MAX_BUFFERS_PER_Q]);
+                     i < queue->next_buf_to_init + count; ++i) {
+                        if (qeth_init_input_buffer(card,
+                                &queue->bufs[i % QDIO_MAX_BUFFERS_PER_Q])) {
+                                break;
+                        } else {
+                                newcount++;
+                        }
+                }
+
+                if (newcount < count) {
+                        /* we are in memory shortage so we switch back to
+                           traditional skb allocation and drop packages */
+                        if (atomic_cmpxchg(&card->force_alloc_skb, 0, 1))
+                                printk(KERN_WARNING
+                                        "qeth: switch to alloc skb\n");
+                        count = newcount;
+                } else {
+                        if (atomic_cmpxchg(&card->force_alloc_skb, 1, 0))
+                                printk(KERN_WARNING "qeth: switch to sg\n");
+                }
+
                 /*
                  * according to old code it should be avoided to requeue all
                  * 128 buffers in order to benefit from PCI avoidance.
@@ -6494,6 +6611,7 @@ qeth_hardsetup_card(struct qeth_card *card)
 
         QETH_DBF_TEXT(setup, 2, "hrdsetup");
 
+        atomic_set(&card->force_alloc_skb, 0);
 retry:
         if (retries < 3){
                 PRINT_WARN("Retrying to do IDX activates.\n");