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net/smc: do not allow eyecatchers in rmbe

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SMC does not support eyecatchers in RMB elements,
decline peers requesting this support.

Signed-off-by: Karsten Graul <kgraul@linux.vnet.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Graul 2018-03-01 13:51:31 +01:00 committed by David S. Miller
parent 4ed75de58e
commit 75d320d611
4 changed files with 27 additions and 3 deletions
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11
net/smc/af_smc.c
View File

@ -291,6 +291,9 @@ static int smc_clnt_conf_first_link(struct smc_sock *smc)
return rc;
}
if (link->llc_confirm_rc)
return SMC_CLC_DECL_RMBE_EC;
rc = smc_ib_modify_qp_rts(link);
if (rc)
return SMC_CLC_DECL_INTERR;
@ -310,7 +313,7 @@ static int smc_clnt_conf_first_link(struct smc_sock *smc)
if (rc < 0)
return SMC_CLC_DECL_TCL;
return rc;
return 0;
}
static void smc_conn_save_peer_info(struct smc_sock *smc,
@ -705,9 +708,13 @@ static int smc_serv_conf_first_link(struct smc_sock *smc)
rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
SMC_CLC_DECLINE);
return rc;
}
return rc;
if (link->llc_confirm_resp_rc)
return SMC_CLC_DECL_RMBE_EC;
return 0;
}
/* setup for RDMA connection of server */

1
net/smc/smc_clc.h
View File

@ -33,6 +33,7 @@
#define SMC_CLC_DECL_INTERR 0x99990000 /* internal error */
#define SMC_CLC_DECL_TCL 0x02040000 /* timeout w4 QP confirm */
#define SMC_CLC_DECL_SEND 0x07000000 /* sending problem */
#define SMC_CLC_DECL_RMBE_EC 0x08000000 /* peer has eyecatcher in RMBE */
struct smc_clc_msg_hdr { /* header1 of clc messages */
u8 eyecatcher[4]; /* eye catcher */

2
net/smc/smc_core.h
View File

@ -89,6 +89,8 @@ struct smc_link {
u8 link_id; /* unique # within link group */
struct completion llc_confirm; /* wait for rx of conf link */
struct completion llc_confirm_resp; /* wait 4 rx of cnf lnk rsp */
int llc_confirm_rc; /* rc from confirm link msg */
int llc_confirm_resp_rc; /* rc from conf_resp msg */
};
/* For now we just allow one parallel link per link group. The SMC protocol

16
net/smc/smc_llc.c
View File

@ -30,6 +30,8 @@ struct smc_llc_hdr {
u8 flags;
};
#define SMC_LLC_FLAG_NO_RMBE_EYEC 0x03
struct smc_llc_msg_confirm_link { /* type 0x01 */
struct smc_llc_hdr hd;
u8 sender_mac[ETH_ALEN];
@ -166,6 +168,7 @@ int smc_llc_send_confirm_link(struct smc_link *link, u8 mac[],
memset(confllc, 0, sizeof(*confllc));
confllc->hd.common.type = SMC_LLC_CONFIRM_LINK;
confllc->hd.length = sizeof(struct smc_llc_msg_confirm_link);
confllc->hd.flags |= SMC_LLC_FLAG_NO_RMBE_EYEC;
if (reqresp == SMC_LLC_RESP)
confllc->hd.flags |= SMC_LLC_FLAG_RESP;
memcpy(confllc->sender_mac, mac, ETH_ALEN);
@ -225,13 +228,24 @@ static void smc_llc_rx_confirm_link(struct smc_link *link,
struct smc_llc_msg_confirm_link *llc)
{
struct smc_link_group *lgr;
int conf_rc;
lgr = container_of(link, struct smc_link_group, lnk[SMC_SINGLE_LINK]);
/* RMBE eyecatchers are not supported */
if (llc->hd.flags & SMC_LLC_FLAG_NO_RMBE_EYEC)
conf_rc = 0;
else
conf_rc = ENOTSUPP;
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
if (lgr->role == SMC_SERV)
if (lgr->role == SMC_SERV) {
link->llc_confirm_resp_rc = conf_rc;
complete(&link->llc_confirm_resp);
}
} else {
if (lgr->role == SMC_CLNT) {
link->llc_confirm_rc = conf_rc;
link->link_id = llc->link_num;
complete(&link->llc_confirm);
}