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net/smc: new smc_rtoken_set functions for multiple link support

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Introduce smc_rtoken_set() to set the rtoken for a new link to an
existing rmb whose rtoken is given, and smc_rtoken_set2() to set an
rtoken for a new link whose link_id is given.

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 2020-04-30 15:55:47 +02:00 committed by David S. Miller
parent 56e8091c7a
commit ba21abd22f
2 changed files with 51 additions and 0 deletions
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47
net/smc/smc_core.c
View file

@ -1368,6 +1368,53 @@ static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr)
return -ENOSPC;
}
static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx,
u32 rkey)
{
int i;
for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
if (test_bit(i, lgr->rtokens_used_mask) &&
lgr->rtokens[i][lnk_idx].rkey == rkey)
return i;
}
return -ENOENT;
}
/* set rtoken for a new link to an existing rmb */
void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
__be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey)
{
int rtok_idx;
rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known));
if (rtok_idx == -ENOENT)
return;
lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey);
lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr);
}
/* set rtoken for a new link whose link_id is given */
void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
__be64 nw_vaddr, __be32 nw_rkey)
{
u64 dma_addr = be64_to_cpu(nw_vaddr);
u32 rkey = ntohl(nw_rkey);
bool found = false;
int link_idx;
for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) {
if (lgr->lnk[link_idx].link_id == link_id) {
found = true;
break;
}
}
if (!found)
return;
lgr->rtokens[rtok_idx][link_idx].rkey = rkey;
lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr;
}
/* add a new rtoken from peer */
int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey)
{

4
net/smc/smc_core.h
View file

@ -352,6 +352,10 @@ int smc_rmb_rtoken_handling(struct smc_connection *conn, struct smc_link *link,
struct smc_clc_msg_accept_confirm *clc);
int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey);
int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey);
void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
__be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey);
void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
__be64 nw_vaddr, __be32 nw_rkey);
void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn);
void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn);
void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn);