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net/smc: unmapping of buffers to support multiple links

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With the support of multiple links that are created and cleared there
is a need to unmap one link from all current buffers. Add unmapping by
link and by rmb. And make smcr_link_clear() available to be called from
the LLC layer.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Graul 2020-05-01 12:48:02 +02:00 committed by David S. Miller
parent 7562a13d5a
commit 4a3641c160
2 changed files with 60 additions and 17 deletions
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76
net/smc/smc_core.c
View File

@ -498,14 +498,69 @@ void smc_conn_free(struct smc_connection *conn)
smc_lgr_schedule_free_work(lgr);
}
static void smcr_link_clear(struct smc_link *lnk)
/* unregister a link from a buf_desc */
static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb,
struct smc_link *lnk)
{
if (is_rmb)
buf_desc->is_reg_mr[lnk->link_idx] = false;
if (!buf_desc->is_map_ib[lnk->link_idx])
return;
if (is_rmb) {
if (buf_desc->mr_rx[lnk->link_idx]) {
smc_ib_put_memory_region(
buf_desc->mr_rx[lnk->link_idx]);
buf_desc->mr_rx[lnk->link_idx] = NULL;
}
smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE);
} else {
smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE);
}
sg_free_table(&buf_desc->sgt[lnk->link_idx]);
buf_desc->is_map_ib[lnk->link_idx] = false;
}
/* unmap all buffers of lgr for a deleted link */
static void smcr_buf_unmap_lgr(struct smc_link *lnk)
{
struct smc_link_group *lgr = lnk->lgr;
struct smc_buf_desc *buf_desc, *bf;
int i;
for (i = 0; i < SMC_RMBE_SIZES; i++) {
mutex_lock(&lgr->rmbs_lock);
list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list)
smcr_buf_unmap_link(buf_desc, true, lnk);
mutex_unlock(&lgr->rmbs_lock);
mutex_lock(&lgr->sndbufs_lock);
list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i],
list)
smcr_buf_unmap_link(buf_desc, false, lnk);
mutex_unlock(&lgr->sndbufs_lock);
}
}
static void smcr_rtoken_clear_link(struct smc_link *lnk)
{
struct smc_link_group *lgr = lnk->lgr;
int i;
for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
lgr->rtokens[i][lnk->link_idx].rkey = 0;
lgr->rtokens[i][lnk->link_idx].dma_addr = 0;
}
}
void smcr_link_clear(struct smc_link *lnk)
{
struct smc_ib_device *smcibdev;
if (lnk->peer_qpn == 0)
if (!lnk->lgr || lnk->state == SMC_LNK_UNUSED)
return;
lnk->peer_qpn = 0;
smc_llc_link_clear(lnk);
smcr_buf_unmap_lgr(lnk);
smcr_rtoken_clear_link(lnk);
smc_ib_modify_qp_reset(lnk);
smc_wr_free_link(lnk);
smc_ib_destroy_queue_pair(lnk);
@ -522,23 +577,10 @@ static void smcr_link_clear(struct smc_link *lnk)
static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
struct smc_buf_desc *buf_desc)
{
struct smc_link *lnk;
int i;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
lnk = &lgr->lnk[i];
if (!buf_desc->is_map_ib[lnk->link_idx])
continue;
if (is_rmb) {
if (buf_desc->mr_rx[lnk->link_idx])
smc_ib_put_memory_region(
buf_desc->mr_rx[lnk->link_idx]);
smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE);
} else {
smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE);
}
sg_free_table(&buf_desc->sgt[lnk->link_idx]);
}
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]);
if (buf_desc->pages)
__free_pages(buf_desc->pages, buf_desc->order);

1
net/smc/smc_core.h
View File

@ -367,6 +367,7 @@ void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr);
int smc_core_init(void);
void smc_core_exit(void);
void smcr_link_clear(struct smc_link *lnk);
int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc);
static inline struct smc_link_group *smc_get_lgr(struct smc_link *link)
{