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Add initial support for negotiating iSER parameters to iscsid(8). Some

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rework might be needed to support asymetrical limits, but this should be
ok for now.

Obtained from:	Mellanox Technologies (earlier version)
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Edward Tomasz Napierala 2016-05-17 07:54:53 +00:00
parent 2685841b38
commit 5abae79af4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=300022
1 changed files with 42 additions and 2 deletions
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44
usr.sbin/iscsid/login.c
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@ -422,8 +422,38 @@ login_negotiate_key(struct connection *conn, const char *name,
/* Ignore */
} else if (strcmp(name, "IFMarker") == 0) {
/* Ignore */
} else if (strcmp(name, "RDMAExtensions") == 0) {
if (conn->conn_conf.isc_iser == 1 &&
strcmp(value, "Yes") != 0) {
log_errx(1, "received unsupported RDMAExtensions");
}
} else if (strcmp(name, "InitiatorRecvDataSegmentLength") == 0) {
tmp = strtoul(value, NULL, 10);
if (tmp <= 0)
log_errx(1, "received invalid "
"InitiatorRecvDataSegmentLength");
if ((size_t)tmp > conn->conn_limits.isl_max_data_segment_length) {
log_debugx("capping InitiatorRecvDataSegmentLength "
"from %d to %zd", tmp,
conn->conn_limits.isl_max_data_segment_length);
tmp = conn->conn_limits.isl_max_data_segment_length;
}
conn->conn_max_data_segment_length = tmp;
} else if (strcmp(name, "TargetPortalGroupTag") == 0) {
/* Ignore */
} else if (strcmp(name, "TargetRecvDataSegmentLength") == 0) {
tmp = strtoul(value, NULL, 10);
if (tmp <= 0) {
log_errx(1,
"received invalid TargetRecvDataSegmentLength");
}
if ((size_t)tmp > conn->conn_limits.isl_max_data_segment_length) {
log_debugx("capping TargetRecvDataSegmentLength "
"from %d to %zd", tmp,
conn->conn_limits.isl_max_data_segment_length);
tmp = conn->conn_limits.isl_max_data_segment_length;
}
conn->conn_max_data_segment_length = tmp;
} else {
log_debugx("unknown key \"%s\"; ignoring", name);
}
@ -465,13 +495,23 @@ login_negotiate(struct connection *conn)
conn->conn_limits.isl_max_data_segment_length);
keys_add(request_keys, "InitialR2T", "Yes");
keys_add(request_keys, "MaxOutstandingR2T", "1");
if (conn->conn_conf.isc_iser == 1) {
keys_add_int(request_keys, "InitiatorRecvDataSegmentLength",
conn->conn_limits.isl_max_data_segment_length);
keys_add_int(request_keys, "TargetRecvDataSegmentLength",
conn->conn_limits.isl_max_data_segment_length);
keys_add(request_keys, "RDMAExtensions", "Yes");
} else {
keys_add_int(request_keys, "MaxRecvDataSegmentLength",
conn->conn_limits.isl_max_data_segment_length);
}
} else {
keys_add(request_keys, "HeaderDigest", "None");
keys_add(request_keys, "DataDigest", "None");
keys_add_int(request_keys, "MaxRecvDataSegmentLength",
conn->conn_limits.isl_max_data_segment_length);
}
keys_add_int(request_keys, "MaxRecvDataSegmentLength",
conn->conn_limits.isl_max_data_segment_length);
keys_add(request_keys, "DefaultTime2Wait", "0");
keys_add(request_keys, "DefaultTime2Retain", "0");
keys_add(request_keys, "ErrorRecoveryLevel", "0");