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liquidio: improve UDP TX performance

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Improve UDP TX performance by:
* reducing the ring size from 2K to 512
* replacing the numerous streaming DMA allocations for info buffers and
  gather lists with one large consistent DMA allocation per ring

BQL is not effective here.  We reduced the ring size because there is heavy
overhead with dma_map_single every so often.  With iommu=on, dma_map_single
in PF Tx data path was taking longer time (~700usec) for every ~250
packets.  Debugged intel_iommu code, and found that PF driver is utilizing
too many static IO virtual address mapping entries (for gather list entries
and info buffers): about 100K entries for two PF's each using 8 rings.
Also, finding an empty entry (in rbtree of device domain's iova mapping in
kernel) during Tx path becomes a bottleneck every so often; the loop to
find the empty entry goes through over 40K iterations; this is too costly
and was the major overhead.  Overhead is low when this loop quits quickly.

Netperf benchmark numbers before and after patch:

PF UDP TX
+--------+--------+------------+------------+---------+
|        |        |  Before    |  After     |         |
| Number |        |  Patch     |  Patch     |         |
|  of    | Packet | Throughput | Throughput | Percent |
| Flows  |  Size  |  (Gbps)    |  (Gbps)    | Change  |
+--------+--------+------------+------------+---------+
|        |   360  |   0.52     |   0.93     |  +78.9  |
|   1    |  1024  |   1.62     |   2.84     |  +75.3  |
|        |  1518  |   2.44     |   4.21     |  +72.5  |
+--------+--------+------------+------------+---------+
|        |   360  |   0.45     |   1.59     | +253.3  |
|   4    |  1024  |   1.34     |   5.48     | +308.9  |
|        |  1518  |   2.27     |   8.31     | +266.1  |
+--------+--------+------------+------------+---------+
|        |   360  |   0.40     |   1.61     | +302.5  |
|   8    |  1024  |   1.64     |   4.24     | +158.5  |
|        |  1518  |   2.87     |   6.52     | +127.2  |
+--------+--------+------------+------------+---------+

VF UDP TX
+--------+--------+------------+------------+---------+
|        |        |  Before    |  After     |         |
| Number |        |  Patch     |  Patch     |         |
|  of    | Packet | Throughput | Throughput | Percent |
| Flows  |  Size  |  (Gbps)    |  (Gbps)    | Change  |
+--------+--------+------------+------------+---------+
|        |   360  |   1.28     |   1.49     |  +16.4  |
|   1    |  1024  |   4.44     |   4.39     |   -1.1  |
|        |  1518  |   6.08     |   6.51     |   +7.1  |
+--------+--------+------------+------------+---------+
|        |   360  |   2.35     |   2.35     |    0.0  |
|   4    |  1024  |   6.41     |   8.07     |  +25.9  |
|        |  1518  |   9.56     |   9.54     |   -0.2  |
+--------+--------+------------+------------+---------+
|        |   360  |   3.41     |   3.65     |   +7.0  |
|   8    |  1024  |   9.35     |   9.34     |   -0.1  |
|        |  1518  |   9.56     |   9.57     |   +0.1  |
+--------+--------+------------+------------+---------+

Signed-off-by: VSR Burru <veerasenareddy.burru@cavium.com>
Signed-off-by: Felix Manlunas <felix.manlunas@cavium.com>
Signed-off-by: Derek Chickles <derek.chickles@cavium.com>
Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
VSR Burru 2017-03-06 18:45:59 -08:00 committed by David S. Miller
parent 5be083cedc
commit 67e303e0c7
7 changed files with 144 additions and 182 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

110
drivers/net/ethernet/cavium/liquidio/lio_main.c
View File

@ -152,7 +152,7 @@ struct octnic_gather {
*/
struct octeon_sg_entry *sg;
u64 sg_dma_ptr;
dma_addr_t sg_dma_ptr;
};
struct handshake {
@ -734,6 +734,9 @@ static void delete_glists(struct lio *lio)
struct octnic_gather *g;
int i;
kfree(lio->glist_lock);
lio->glist_lock = NULL;
if (!lio->glist)
return;
@ -741,23 +744,26 @@ static void delete_glists(struct lio *lio)
do {
g = (struct octnic_gather *)
list_delete_head(&lio->glist[i]);
if (g) {
if (g->sg) {
dma_unmap_single(&lio->oct_dev->
pci_dev->dev,
g->sg_dma_ptr,
g->sg_size,
DMA_TO_DEVICE);
kfree((void *)((unsigned long)g->sg -
g->adjust));
}
if (g)
kfree(g);
}
} while (g);
if (lio->glists_virt_base && lio->glists_virt_base[i]) {
lio_dma_free(lio->oct_dev,
lio->glist_entry_size * lio->tx_qsize,
lio->glists_virt_base[i],
lio->glists_dma_base[i]);
}
}
kfree((void *)lio->glist);
kfree((void *)lio->glist_lock);
kfree(lio->glists_virt_base);
lio->glists_virt_base = NULL;
kfree(lio->glists_dma_base);
lio->glists_dma_base = NULL;
kfree(lio->glist);
lio->glist = NULL;
}
/**
@ -772,13 +778,30 @@ static int setup_glists(struct octeon_device *oct, struct lio *lio, int num_iqs)
lio->glist_lock = kcalloc(num_iqs, sizeof(*lio->glist_lock),
GFP_KERNEL);
if (!lio->glist_lock)
return 1;
return -ENOMEM;
lio->glist = kcalloc(num_iqs, sizeof(*lio->glist),
GFP_KERNEL);
if (!lio->glist) {
kfree((void *)lio->glist_lock);
return 1;
kfree(lio->glist_lock);
lio->glist_lock = NULL;
return -ENOMEM;
}
lio->glist_entry_size =
ROUNDUP8((ROUNDUP4(OCTNIC_MAX_SG) >> 2) * OCT_SG_ENTRY_SIZE);
/* allocate memory to store virtual and dma base address of
* per glist consistent memory
*/
lio->glists_virt_base = kcalloc(num_iqs, sizeof(*lio->glists_virt_base),
GFP_KERNEL);
lio->glists_dma_base = kcalloc(num_iqs, sizeof(*lio->glists_dma_base),
GFP_KERNEL);
if (!lio->glists_virt_base || !lio->glists_dma_base) {
delete_glists(lio);
return -ENOMEM;
}
for (i = 0; i < num_iqs; i++) {
@ -788,6 +811,16 @@ static int setup_glists(struct octeon_device *oct, struct lio *lio, int num_iqs)
INIT_LIST_HEAD(&lio->glist[i]);
lio->glists_virt_base[i] =
lio_dma_alloc(oct,
lio->glist_entry_size * lio->tx_qsize,
&lio->glists_dma_base[i]);
if (!lio->glists_virt_base[i]) {
delete_glists(lio);
return -ENOMEM;
}
for (j = 0; j < lio->tx_qsize; j++) {
g = kzalloc_node(sizeof(*g), GFP_KERNEL,
numa_node);
@ -796,43 +829,18 @@ static int setup_glists(struct octeon_device *oct, struct lio *lio, int num_iqs)
if (!g)
break;
g->sg_size = ((ROUNDUP4(OCTNIC_MAX_SG) >> 2) *
OCT_SG_ENTRY_SIZE);
g->sg = lio->glists_virt_base[i] +
(j * lio->glist_entry_size);
g->sg = kmalloc_node(g->sg_size + 8,
GFP_KERNEL, numa_node);
if (!g->sg)
g->sg = kmalloc(g->sg_size + 8, GFP_KERNEL);
if (!g->sg) {
kfree(g);
break;
}
/* The gather component should be aligned on 64-bit
* boundary
*/
if (((unsigned long)g->sg) & 7) {
g->adjust = 8 - (((unsigned long)g->sg) & 7);
g->sg = (struct octeon_sg_entry *)
((unsigned long)g->sg + g->adjust);
}
g->sg_dma_ptr = dma_map_single(&oct->pci_dev->dev,
g->sg, g->sg_size,
DMA_TO_DEVICE);
if (dma_mapping_error(&oct->pci_dev->dev,
g->sg_dma_ptr)) {
kfree((void *)((unsigned long)g->sg -
g->adjust));
kfree(g);
break;
}
g->sg_dma_ptr = lio->glists_dma_base[i] +
(j * lio->glist_entry_size);
list_add_tail(&g->list, &lio->glist[i]);
}
if (j != lio->tx_qsize) {
delete_glists(lio);
return 1;
return -ENOMEM;
}
}
@ -1885,9 +1893,6 @@ static void free_netsgbuf(void *buf)
i++;
}
dma_sync_single_for_cpu(&lio->oct_dev->pci_dev->dev,
g->sg_dma_ptr, g->sg_size, DMA_TO_DEVICE);
iq = skb_iq(lio, skb);
spin_lock(&lio->glist_lock[iq]);
list_add_tail(&g->list, &lio->glist[iq]);
@ -1933,9 +1938,6 @@ static void free_netsgbuf_with_resp(void *buf)
i++;
}
dma_sync_single_for_cpu(&lio->oct_dev->pci_dev->dev,
g->sg_dma_ptr, g->sg_size, DMA_TO_DEVICE);
iq = skb_iq(lio, skb);
spin_lock(&lio->glist_lock[iq]);
@ -3273,8 +3275,6 @@ static int liquidio_xmit(struct sk_buff *skb, struct net_device *netdev)
i++;
}
dma_sync_single_for_device(&oct->pci_dev->dev, g->sg_dma_ptr,
g->sg_size, DMA_TO_DEVICE);
dptr = g->sg_dma_ptr;
if (OCTEON_CN23XX_PF(oct))

104
drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
View File

@ -108,6 +108,8 @@ struct octnic_gather {
* received from the IP layer.
*/
struct octeon_sg_entry *sg;
dma_addr_t sg_dma_ptr;
};
struct octeon_device_priv {
@ -490,6 +492,9 @@ static void delete_glists(struct lio *lio)
struct octnic_gather *g;
int i;
kfree(lio->glist_lock);
lio->glist_lock = NULL;
if (!lio->glist)
return;
@ -497,17 +502,26 @@ static void delete_glists(struct lio *lio)
do {
g = (struct octnic_gather *)
list_delete_head(&lio->glist[i]);
if (g) {
if (g->sg)
kfree((void *)((unsigned long)g->sg -
g->adjust));
if (g)
kfree(g);
}
} while (g);
if (lio->glists_virt_base && lio->glists_virt_base[i]) {
lio_dma_free(lio->oct_dev,
lio->glist_entry_size * lio->tx_qsize,
lio->glists_virt_base[i],
lio->glists_dma_base[i]);
}
}
kfree(lio->glists_virt_base);
lio->glists_virt_base = NULL;
kfree(lio->glists_dma_base);
lio->glists_dma_base = NULL;
kfree(lio->glist);
kfree(lio->glist_lock);
lio->glist = NULL;
}
/**
@ -522,13 +536,30 @@ static int setup_glists(struct lio *lio, int num_iqs)
lio->glist_lock =
kzalloc(sizeof(*lio->glist_lock) * num_iqs, GFP_KERNEL);
if (!lio->glist_lock)
return 1;
return -ENOMEM;
lio->glist =
kzalloc(sizeof(*lio->glist) * num_iqs, GFP_KERNEL);
if (!lio->glist) {
kfree(lio->glist_lock);
return 1;
lio->glist_lock = NULL;
return -ENOMEM;
}
lio->glist_entry_size =
ROUNDUP8((ROUNDUP4(OCTNIC_MAX_SG) >> 2) * OCT_SG_ENTRY_SIZE);
/* allocate memory to store virtual and dma base address of
* per glist consistent memory
*/
lio->glists_virt_base = kcalloc(num_iqs, sizeof(*lio->glists_virt_base),
GFP_KERNEL);
lio->glists_dma_base = kcalloc(num_iqs, sizeof(*lio->glists_dma_base),
GFP_KERNEL);
if (!lio->glists_virt_base || !lio->glists_dma_base) {
delete_glists(lio);
return -ENOMEM;
}
for (i = 0; i < num_iqs; i++) {
@ -536,34 +567,33 @@ static int setup_glists(struct lio *lio, int num_iqs)
INIT_LIST_HEAD(&lio->glist[i]);
lio->glists_virt_base[i] =
lio_dma_alloc(lio->oct_dev,
lio->glist_entry_size * lio->tx_qsize,
&lio->glists_dma_base[i]);
if (!lio->glists_virt_base[i]) {
delete_glists(lio);
return -ENOMEM;
}
for (j = 0; j < lio->tx_qsize; j++) {
g = kzalloc(sizeof(*g), GFP_KERNEL);
if (!g)
break;
g->sg_size = ((ROUNDUP4(OCTNIC_MAX_SG) >> 2) *
OCT_SG_ENTRY_SIZE);
g->sg = lio->glists_virt_base[i] +
(j * lio->glist_entry_size);
g->sg = kmalloc(g->sg_size + 8, GFP_KERNEL);
if (!g->sg) {
kfree(g);
break;
}
g->sg_dma_ptr = lio->glists_dma_base[i] +
(j * lio->glist_entry_size);
/* The gather component should be aligned on 64-bit
* boundary
*/
if (((unsigned long)g->sg) & 7) {
g->adjust = 8 - (((unsigned long)g->sg) & 7);
g->sg = (struct octeon_sg_entry *)
((unsigned long)g->sg + g->adjust);
}
list_add_tail(&g->list, &lio->glist[i]);
}
if (j != lio->tx_qsize) {
delete_glists(lio);
return 1;
return -ENOMEM;
}
}
@ -1324,10 +1354,6 @@ static void free_netsgbuf(void *buf)
i++;
}
dma_unmap_single(&lio->oct_dev->pci_dev->dev,
finfo->dptr, g->sg_size,
DMA_TO_DEVICE);
iq = skb_iq(lio, skb);
spin_lock(&lio->glist_lock[iq]);
@ -1374,10 +1400,6 @@ static void free_netsgbuf_with_resp(void *buf)
i++;
}
dma_unmap_single(&lio->oct_dev->pci_dev->dev,
finfo->dptr, g->sg_size,
DMA_TO_DEVICE);
iq = skb_iq(lio, skb);
spin_lock(&lio->glist_lock[iq]);
@ -2382,23 +2404,7 @@ static int liquidio_xmit(struct sk_buff *skb, struct net_device *netdev)
i++;
}
dptr = dma_map_single(&oct->pci_dev->dev,
g->sg, g->sg_size,
DMA_TO_DEVICE);
if (dma_mapping_error(&oct->pci_dev->dev, dptr)) {
dev_err(&oct->pci_dev->dev, "%s DMA mapping error 4\n",
__func__);
dma_unmap_single(&oct->pci_dev->dev, g->sg[0].ptr[0],
skb->len - skb->data_len,
DMA_TO_DEVICE);
for (j = 1; j <= frags; j++) {
frag = &skb_shinfo(skb)->frags[j - 1];
dma_unmap_page(&oct->pci_dev->dev,
g->sg[j >> 2].ptr[j & 3],
frag->size, DMA_TO_DEVICE);
}
return NETDEV_TX_BUSY;
}
dptr = g->sg_dma_ptr;
ndata.cmd.cmd3.dptr = dptr;
finfo->dptr = dptr;

6
drivers/net/ethernet/cavium/liquidio/octeon_config.h
View File

@ -71,17 +71,17 @@
#define CN23XX_MAX_RINGS_PER_VF 8
#define CN23XX_MAX_INPUT_QUEUES CN23XX_MAX_RINGS_PER_PF
#define CN23XX_MAX_IQ_DESCRIPTORS 2048
#define CN23XX_MAX_IQ_DESCRIPTORS 512
#define CN23XX_DB_MIN 1
#define CN23XX_DB_MAX 8
#define CN23XX_DB_TIMEOUT 1
#define CN23XX_MAX_OUTPUT_QUEUES CN23XX_MAX_RINGS_PER_PF
#define CN23XX_MAX_OQ_DESCRIPTORS 2048
#define CN23XX_MAX_OQ_DESCRIPTORS 512
#define CN23XX_OQ_BUF_SIZE 1536
#define CN23XX_OQ_PKTSPER_INTR 128
/*#define CAVIUM_ONLY_CN23XX_RX_PERF*/
#define CN23XX_OQ_REFIL_THRESHOLD 128
#define CN23XX_OQ_REFIL_THRESHOLD 16
#define CN23XX_OQ_INTR_PKT 64
#define CN23XX_OQ_INTR_TIME 100

17
drivers/net/ethernet/cavium/liquidio/octeon_droq.c
View File

@ -155,11 +155,6 @@ octeon_droq_destroy_ring_buffers(struct octeon_device *oct,
recv_buffer_destroy(droq->recv_buf_list[i].buffer,
pg_info);
if (droq->desc_ring && droq->desc_ring[i].info_ptr)
lio_unmap_ring_info(oct->pci_dev,
(u64)droq->
desc_ring[i].info_ptr,
OCT_DROQ_INFO_SIZE);
droq->recv_buf_list[i].buffer = NULL;
}
@ -211,10 +206,7 @@ int octeon_delete_droq(struct octeon_device *oct, u32 q_no)
vfree(droq->recv_buf_list);
if (droq->info_base_addr)
cnnic_free_aligned_dma(oct->pci_dev, droq->info_list,
droq->info_alloc_size,
droq->info_base_addr,
droq->info_list_dma);
lio_free_info_buffer(oct, droq);
if (droq->desc_ring)
lio_dma_free(oct, (droq->max_count * OCT_DROQ_DESC_SIZE),
@ -294,12 +286,7 @@ int octeon_init_droq(struct octeon_device *oct,
dev_dbg(&oct->pci_dev->dev, "droq[%d]: num_desc: %d\n", q_no,
droq->max_count);
droq->info_list =
cnnic_numa_alloc_aligned_dma((droq->max_count *
OCT_DROQ_INFO_SIZE),
&droq->info_alloc_size,
&droq->info_base_addr,
numa_node);
droq->info_list = lio_alloc_info_buffer(oct, droq);
if (!droq->info_list) {
dev_err(&oct->pci_dev->dev, "Cannot allocate memory for info list.\n");
lio_dma_free(oct, (droq->max_count * OCT_DROQ_DESC_SIZE),

4
drivers/net/ethernet/cavium/liquidio/octeon_droq.h
View File

@ -325,10 +325,10 @@ struct octeon_droq {
size_t desc_ring_dma;
/** Info ptr list are allocated at this virtual address. */
size_t info_base_addr;
void *info_base_addr;
/** DMA mapped address of the info list */
size_t info_list_dma;
dma_addr_t info_list_dma;
/** Allocated size of info list. */
u32 info_alloc_size;

42
drivers/net/ethernet/cavium/liquidio/octeon_main.h
View File

@ -140,48 +140,6 @@ err_release_region:
return 1;
}
static inline void *
cnnic_numa_alloc_aligned_dma(u32 size,
u32 *alloc_size,
size_t *orig_ptr,
int numa_node)
{
int retries = 0;
void *ptr = NULL;
#define OCTEON_MAX_ALLOC_RETRIES 1
do {
struct page *page = NULL;
page = alloc_pages_node(numa_node,
GFP_KERNEL,
get_order(size));
if (!page)
page = alloc_pages(GFP_KERNEL,
get_order(size));
ptr = (void *)page_address(page);
if ((unsigned long)ptr & 0x07) {
__free_pages(page, get_order(size));
ptr = NULL;
/* Increment the size required if the first
* attempt failed.
*/
if (!retries)
size += 7;
}
retries++;
} while ((retries <= OCTEON_MAX_ALLOC_RETRIES) && !ptr);
*alloc_size = size;
*orig_ptr = (unsigned long)ptr;
if ((unsigned long)ptr & 0x07)
ptr = (void *)(((unsigned long)ptr + 7) & ~(7UL));
return ptr;
}
#define cnnic_free_aligned_dma(pci_dev, ptr, size, orig_ptr, dma_addr) \
free_pages(orig_ptr, get_order(size))
static inline int
sleep_cond(wait_queue_head_t *wait_queue, int *condition)
{

43
drivers/net/ethernet/cavium/liquidio/octeon_network.h
View File

@ -62,6 +62,9 @@ struct lio {
/** Array of gather component linked lists */
struct list_head *glist;
void **glists_virt_base;
dma_addr_t *glists_dma_base;
u32 glist_entry_size;
/** Pointer to the NIC properties for the Octeon device this network
* interface is associated with.
@ -344,6 +347,29 @@ static inline void tx_buffer_free(void *buffer)
#define lio_dma_free(oct, size, virt_addr, dma_addr) \
dma_free_coherent(&(oct)->pci_dev->dev, size, virt_addr, dma_addr)
static inline void *
lio_alloc_info_buffer(struct octeon_device *oct,
struct octeon_droq *droq)
{
void *virt_ptr;
virt_ptr = lio_dma_alloc(oct, (droq->max_count * OCT_DROQ_INFO_SIZE),
&droq->info_list_dma);
if (virt_ptr) {
droq->info_alloc_size = droq->max_count * OCT_DROQ_INFO_SIZE;
droq->info_base_addr = virt_ptr;
}
return virt_ptr;
}
static inline void lio_free_info_buffer(struct octeon_device *oct,
struct octeon_droq *droq)
{
lio_dma_free(oct, droq->info_alloc_size, droq->info_base_addr,
droq->info_list_dma);
}
static inline
void *get_rbd(struct sk_buff *skb)
{
@ -359,22 +385,7 @@ void *get_rbd(struct sk_buff *skb)
static inline u64
lio_map_ring_info(struct octeon_droq *droq, u32 i)
{
dma_addr_t dma_addr;
struct octeon_device *oct = droq->oct_dev;
dma_addr = dma_map_single(&oct->pci_dev->dev, &droq->info_list[i],
OCT_DROQ_INFO_SIZE, DMA_FROM_DEVICE);
WARN_ON(dma_mapping_error(&oct->pci_dev->dev, dma_addr));
return (u64)dma_addr;
}
static inline void
lio_unmap_ring_info(struct pci_dev *pci_dev,
u64 info_ptr, u32 size)
{
dma_unmap_single(&pci_dev->dev, info_ptr, size, DMA_FROM_DEVICE);
return droq->info_list_dma + (i * sizeof(struct octeon_droq_info));
}
static inline u64