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net/smc: introduce sg-logic for send buffers 

SMC send buffers are processed the same way as RMBs. Since RMBs have
been converted to sg-logic, do the same for send buffers.

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2017-07-28 13:56:19 +02:00 committed by David S. Miller
parent d5b361b0dc
commit 9d8fb61734
5 changed files with 38 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
net/smc/smc_core.c
View File

@ -248,6 +248,7 @@ static void smc_link_clear(struct smc_link *lnk)
static void smc_lgr_free_sndbufs(struct smc_link_group *lgr)
{
struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK];
struct smc_buf_desc *sndbuf_desc, *bf_desc;
int i;
@ -255,10 +256,11 @@ static void smc_lgr_free_sndbufs(struct smc_link_group *lgr)
list_for_each_entry_safe(sndbuf_desc, bf_desc, &lgr->sndbufs[i],
list) {
list_del(&sndbuf_desc->list);
smc_ib_buf_unmap(lgr->lnk[SMC_SINGLE_LINK].smcibdev,
smc_uncompress_bufsize(i),
sndbuf_desc, DMA_TO_DEVICE);
kfree(sndbuf_desc->cpu_addr);
smc_ib_buf_unmap_sg(lnk->smcibdev, sndbuf_desc,
DMA_TO_DEVICE);
sg_free_table(&sndbuf_desc->sgt[SMC_SINGLE_LINK]);
free_pages((unsigned long)sndbuf_desc->cpu_addr,
sndbuf_desc->order);
kfree(sndbuf_desc);
}
}
@ -517,6 +519,9 @@ int smc_sndbuf_create(struct smc_sock *smc)
for (bufsize_short = smc_compress_bufsize(smc->sk.sk_sndbuf / 2);
bufsize_short >= 0; bufsize_short--) {
bufsize = smc_uncompress_bufsize(bufsize_short);
if ((1 << get_order(bufsize)) > SG_MAX_SINGLE_ALLOC)
continue;
/* check for reusable sndbuf_slot in the link group */
sndbuf_desc = smc_sndbuf_get_slot(lgr, bufsize_short);
if (sndbuf_desc) {
@ -527,10 +532,12 @@ int smc_sndbuf_create(struct smc_sock *smc)
sndbuf_desc = kzalloc(sizeof(*sndbuf_desc), GFP_KERNEL);
if (!sndbuf_desc)
break; /* give up with -ENOMEM */
sndbuf_desc->cpu_addr = kzalloc(bufsize,
GFP_KERNEL | __GFP_NOWARN |
__GFP_NOMEMALLOC |
__GFP_NORETRY);
sndbuf_desc->cpu_addr =
(void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN |
__GFP_NOMEMALLOC |
__GFP_NORETRY | __GFP_ZERO,
get_order(bufsize));
if (!sndbuf_desc->cpu_addr) {
kfree(sndbuf_desc);
sndbuf_desc = NULL;
@ -539,14 +546,31 @@ int smc_sndbuf_create(struct smc_sock *smc)
*/
continue;
}
rc = smc_ib_buf_map(lgr->lnk[SMC_SINGLE_LINK].smcibdev,
bufsize, sndbuf_desc, DMA_TO_DEVICE);
sndbuf_desc->order = get_order(bufsize);
rc = sg_alloc_table(&sndbuf_desc->sgt[SMC_SINGLE_LINK], 1,
GFP_KERNEL);
if (rc) {
kfree(sndbuf_desc->cpu_addr);
free_pages((unsigned long)sndbuf_desc->cpu_addr,
sndbuf_desc->order);
kfree(sndbuf_desc);
sndbuf_desc = NULL;
continue;
}
sg_set_buf(sndbuf_desc->sgt[SMC_SINGLE_LINK].sgl,
sndbuf_desc->cpu_addr, bufsize);
rc = smc_ib_buf_map_sg(lgr->lnk[SMC_SINGLE_LINK].smcibdev,
sndbuf_desc, DMA_TO_DEVICE);
if (rc != 1) {
sg_free_table(&sndbuf_desc->sgt[SMC_SINGLE_LINK]);
free_pages((unsigned long)sndbuf_desc->cpu_addr,
sndbuf_desc->order);
kfree(sndbuf_desc);
sndbuf_desc = NULL;
continue; /* if mapping failed, try smaller one */
}
sndbuf_desc->used = 1;
write_lock_bh(&lgr->sndbufs_lock);
list_add(&sndbuf_desc->list, &lgr->sndbufs[bufsize_short]);

2
net/smc/smc_core.h
View File

@ -102,8 +102,6 @@ struct smc_link {
/* tx/rx buffer list element for sndbufs list and rmbs list of a lgr */
struct smc_buf_desc {
struct list_head list;
u64 dma_addr[SMC_LINKS_PER_LGR_MAX];
/* mapped address of buffer */
void *cpu_addr; /* virtual address of buffer */
struct sg_table sgt[SMC_LINKS_PER_LGR_MAX];/* virtual buffer */
struct ib_mr *mr_rx[SMC_LINKS_PER_LGR_MAX];

29
net/smc/smc_ib.c
View File

@ -295,35 +295,6 @@ int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
return 0;
}
/* map a new TX or RX buffer to DMA */
int smc_ib_buf_map(struct smc_ib_device *smcibdev, int buf_size,
struct smc_buf_desc *buf_slot,
enum dma_data_direction data_direction)
{
int rc = 0;
if (buf_slot->dma_addr[SMC_SINGLE_LINK])
return rc; /* already mapped */
buf_slot->dma_addr[SMC_SINGLE_LINK] =
ib_dma_map_single(smcibdev->ibdev, buf_slot->cpu_addr,
buf_size, data_direction);
if (ib_dma_mapping_error(smcibdev->ibdev,
buf_slot->dma_addr[SMC_SINGLE_LINK]))
rc = -EIO;
return rc;
}
void smc_ib_buf_unmap(struct smc_ib_device *smcibdev, int buf_size,
struct smc_buf_desc *buf_slot,
enum dma_data_direction data_direction)
{
if (!buf_slot->dma_addr[SMC_SINGLE_LINK])
return; /* already unmapped */
ib_dma_unmap_single(smcibdev->ibdev, *buf_slot->dma_addr, buf_size,
data_direction);
buf_slot->dma_addr[SMC_SINGLE_LINK] = 0;
}
/* Map a new TX or RX buffer SG-table to DMA */
int smc_ib_buf_map_sg(struct smc_ib_device *smcibdev,
struct smc_buf_desc *buf_slot,

6
net/smc/smc_ib.h
View File

@ -51,12 +51,6 @@ int smc_ib_register_client(void) __init;
void smc_ib_unregister_client(void);
bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport);
int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport);
int smc_ib_buf_map(struct smc_ib_device *smcibdev, int buf_size,
struct smc_buf_desc *buf_slot,
enum dma_data_direction data_direction);
void smc_ib_buf_unmap(struct smc_ib_device *smcibdev, int bufsize,
struct smc_buf_desc *buf_slot,
enum dma_data_direction data_direction);
int smc_ib_buf_map_sg(struct smc_ib_device *smcibdev,
struct smc_buf_desc *buf_slot,
enum dma_data_direction data_direction);

6
net/smc/smc_tx.c
View File

@ -277,6 +277,7 @@ static int smc_tx_rdma_writes(struct smc_connection *conn)
struct smc_link_group *lgr = conn->lgr;
int to_send, rmbespace;
struct smc_link *link;
dma_addr_t dma_addr;
int num_sges;
int rc;
@ -334,12 +335,11 @@ static int smc_tx_rdma_writes(struct smc_connection *conn)
src_len = conn->sndbuf_size - sent.count;
}
src_len_sum = src_len;
dma_addr = sg_dma_address(conn->sndbuf_desc->sgt[SMC_SINGLE_LINK].sgl);
for (dstchunk = 0; dstchunk < 2; dstchunk++) {
num_sges = 0;
for (srcchunk = 0; srcchunk < 2; srcchunk++) {
sges[srcchunk].addr =
conn->sndbuf_desc->dma_addr[SMC_SINGLE_LINK] +
src_off;
sges[srcchunk].addr = dma_addr + src_off;
sges[srcchunk].length = src_len;
sges[srcchunk].lkey = link->roce_pd->local_dma_lkey;
num_sges++;