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iscsi: Move the maximum data segment limits into 'struct icl_conn'.

Browse Source 
This fixes a few bugs in iSCSI backends where the backends were using
the limits they advertised initially during the login phase as the
final values instead of the values negotiated with the other end.

Reported by:	Jithesh Arakkan @ Chelsio
Reviewed by:	mav
Differential Revision:	https://reviews.freebsd.org/D30271
This commit is contained in:
John Baldwin 2021-05-20 09:59:11 -07:00
parent 71e3d1b3a0
commit 0cc7d64a2a
7 changed files with 47 additions and 59 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
sys/cam/ctl/ctl_frontend_iscsi.c
View File

@ -1568,8 +1568,10 @@ cfiscsi_ioctl_handoff(struct ctl_iscsi *ci)
*/
cs->cs_cmdsn = cihp->cmdsn;
cs->cs_statsn = cihp->statsn;
cs->cs_max_recv_data_segment_length = cihp->max_recv_data_segment_length;
cs->cs_max_send_data_segment_length = cihp->max_send_data_segment_length;
cs->cs_conn->ic_max_recv_data_segment_length =
cihp->max_recv_data_segment_length;
cs->cs_conn->ic_max_send_data_segment_length =
cihp->max_send_data_segment_length;
cs->cs_max_burst_length = cihp->max_burst_length;
cs->cs_first_burst_length = cihp->first_burst_length;
cs->cs_immediate_data = !!cihp->immediate_data;
@ -1734,8 +1736,8 @@ cfiscsi_ioctl_list(struct ctl_iscsi *ci)
cs->cs_target->ct_tag,
cs->cs_conn->ic_header_crc32c ? "CRC32C" : "None",
cs->cs_conn->ic_data_crc32c ? "CRC32C" : "None",
cs->cs_max_recv_data_segment_length,
cs->cs_max_send_data_segment_length,
cs->cs_conn->ic_max_recv_data_segment_length,
cs->cs_conn->ic_max_send_data_segment_length,
cs->cs_max_burst_length,
cs->cs_first_burst_length,
cs->cs_immediate_data,
@ -2534,12 +2536,14 @@ cfiscsi_datamove_in(union ctl_io *io)
/*
* Truncate to maximum data segment length.
*/
KASSERT(response->ip_data_len < cs->cs_max_send_data_segment_length,
KASSERT(response->ip_data_len <
cs->cs_conn->ic_max_send_data_segment_length,
("ip_data_len %zd >= max_send_data_segment_length %d",
response->ip_data_len, cs->cs_max_send_data_segment_length));
response->ip_data_len,
cs->cs_conn->ic_max_send_data_segment_length));
if (response->ip_data_len + len >
cs->cs_max_send_data_segment_length) {
len = cs->cs_max_send_data_segment_length -
cs->cs_conn->ic_max_send_data_segment_length) {
len = cs->cs_conn->ic_max_send_data_segment_length -
response->ip_data_len;
KASSERT(len <= sg_len, ("len %zd > sg_len %zd",
len, sg_len));
@ -2599,7 +2603,8 @@ cfiscsi_datamove_in(union ctl_io *io)
i++;
}
if (response->ip_data_len == cs->cs_max_send_data_segment_length) {
if (response->ip_data_len ==
cs->cs_conn->ic_max_send_data_segment_length) {
/*
* Can't stuff more data into the current PDU;
* queue it. Note that's not enough to check

2
sys/cam/ctl/ctl_frontend_iscsi.h
View File

@ -86,8 +86,6 @@ struct cfiscsi_session {
bool cs_terminating;
bool cs_handoff_in_progress;
bool cs_tasks_aborted;
int cs_max_recv_data_segment_length;
int cs_max_send_data_segment_length;
int cs_max_burst_length;
int cs_first_burst_length;
bool cs_immediate_data;

23
sys/dev/cxgbe/cxgbei/icl_cxgbei.c
View File

@ -469,7 +469,7 @@ icl_cxgbei_conn_pdu_append_data(struct icl_conn *ic, struct icl_pdu *ip,
}
MPASS(len == 0);
}
MPASS(ip->ip_data_len <= ic->ic_max_data_segment_length);
MPASS(ip->ip_data_len <= ic->ic_max_send_data_segment_length);
return (0);
}
@ -565,8 +565,6 @@ icl_cxgbei_new_conn(const char *name, struct mtx *lock)
#ifdef DIAGNOSTIC
refcount_init(&ic->ic_outstanding_pdus, 0);
#endif
/* This is a stop-gap value that will be corrected during handoff. */
ic->ic_max_data_segment_length = 16384;
ic->ic_name = name;
ic->ic_offload = "cxgbei";
ic->ic_unmapped = false;
@ -806,26 +804,11 @@ icl_cxgbei_conn_handoff(struct icl_conn *ic, int fd)
icc->toep = toep;
icc->cwt = cxgbei_select_worker_thread(icc);
/*
* We maintain the _send_ DSL in this field just to have a
* convenient way to assert that the kernel never sends
* oversized PDUs. This field is otherwise unused in the driver
* or the kernel.
*/
ic->ic_max_data_segment_length = ci->max_tx_pdu_len -
ISCSI_BHS_SIZE;
icc->ulp_submode = 0;
if (ic->ic_header_crc32c) {
if (ic->ic_header_crc32c)
icc->ulp_submode |= ULP_CRC_HEADER;
ic->ic_max_data_segment_length -=
ISCSI_HEADER_DIGEST_SIZE;
}
if (ic->ic_data_crc32c) {
if (ic->ic_data_crc32c)
icc->ulp_submode |= ULP_CRC_DATA;
ic->ic_max_data_segment_length -=
ISCSI_DATA_DIGEST_SIZE;
}
so->so_options |= SO_NO_DDP;
toep->params.ulp_mode = ULP_MODE_ISCSI;
toep->ulpcb = icc;

3
sys/dev/iscsi/icl.h
View File

@ -109,7 +109,8 @@ struct icl_conn {
bool ic_data_crc32c;
bool ic_send_running;
bool ic_receive_running;
size_t ic_max_data_segment_length;
uint32_t ic_max_recv_data_segment_length;
uint32_t ic_max_send_data_segment_length;
size_t ic_maxtags;
bool ic_disconnecting;
bool ic_iser;

9
sys/dev/iscsi/icl_soft.c
View File

@ -573,7 +573,7 @@ icl_conn_receive_pdu(struct icl_conn *ic, struct mbuf **r, size_t *rs)
*/
len = icl_pdu_data_segment_length(request);
if (len > ic->ic_max_data_segment_length) {
if (len > ic->ic_max_recv_data_segment_length) {
ICL_WARN("received data segment "
"length %zd is larger than negotiated; "
"dropping connection", len);
@ -1154,7 +1154,6 @@ icl_soft_new_conn(const char *name, struct mtx *lock)
#ifdef DIAGNOSTIC
refcount_init(&ic->ic_outstanding_pdus, 0);
#endif
ic->ic_max_data_segment_length = max_data_segment_length;
ic->ic_name = name;
ic->ic_offload = "None";
ic->ic_unmapped = false;
@ -1205,13 +1204,17 @@ icl_conn_start(struct icl_conn *ic)
* send a PDU in pieces; thus, the minimum buffer size is equal
* to the maximum PDU size. "+4" is to account for possible padding.
*/
minspace = sizeof(struct iscsi_bhs) + ic->ic_max_data_segment_length +
minspace = sizeof(struct iscsi_bhs) +
ic->ic_max_send_data_segment_length +
ISCSI_HEADER_DIGEST_SIZE + ISCSI_DATA_DIGEST_SIZE + 4;
if (sendspace < minspace) {
ICL_WARN("kern.icl.sendspace too low; must be at least %zd",
minspace);
sendspace = minspace;
}
minspace = sizeof(struct iscsi_bhs) +
ic->ic_max_recv_data_segment_length +
ISCSI_HEADER_DIGEST_SIZE + ISCSI_DATA_DIGEST_SIZE + 4;
if (recvspace < minspace) {
ICL_WARN("kern.icl.recvspace too low; must be at least %zd",
minspace);

44
sys/dev/iscsi/iscsi.c
View File

@ -1206,8 +1206,8 @@ iscsi_pdu_handle_r2t(struct icl_pdu *response)
for (;;) {
len = total_len;
if (len > is->is_max_send_data_segment_length)
len = is->is_max_send_data_segment_length;
if (len > is->is_conn->ic_max_send_data_segment_length)
len = is->is_conn->ic_max_send_data_segment_length;
if (off + len > csio->dxfer_len) {
ISCSI_SESSION_WARN(is, "target requested invalid "
@ -1433,9 +1433,9 @@ iscsi_ioctl_daemon_handoff(struct iscsi_softc *sc,
is->is_initial_r2t = handoff->idh_initial_r2t;
is->is_immediate_data = handoff->idh_immediate_data;
is->is_max_recv_data_segment_length =
ic->ic_max_recv_data_segment_length =
handoff->idh_max_recv_data_segment_length;
is->is_max_send_data_segment_length =
ic->ic_max_send_data_segment_length =
handoff->idh_max_send_data_segment_length;
is->is_max_burst_length = handoff->idh_max_burst_length;
is->is_first_burst_length = handoff->idh_first_burst_length;
@ -1648,7 +1648,7 @@ iscsi_ioctl_daemon_send(struct iscsi_softc *sc,
return (EIO);
datalen = ids->ids_data_segment_len;
if (datalen > is->is_max_send_data_segment_length)
if (datalen > is->is_conn->ic_max_send_data_segment_length)
return (EINVAL);
if (datalen > 0) {
data = malloc(datalen, M_ISCSI, M_WAITOK);
@ -1793,18 +1793,6 @@ iscsi_ioctl_session_add(struct iscsi_softc *sc, struct iscsi_session_add *isa)
is = malloc(sizeof(*is), M_ISCSI, M_ZERO | M_WAITOK);
memcpy(&is->is_conf, &isa->isa_conf, sizeof(is->is_conf));
/*
* Set some default values, from RFC 3720, section 12.
*
* These values are updated by the handoff IOCTL, but are
* needed prior to the handoff to support sending the ISER
* login PDU.
*/
is->is_max_recv_data_segment_length = 8192;
is->is_max_send_data_segment_length = 8192;
is->is_max_burst_length = 262144;
is->is_first_burst_length = 65536;
sx_xlock(&sc->sc_lock);
/*
@ -1847,6 +1835,18 @@ iscsi_ioctl_session_add(struct iscsi_softc *sc, struct iscsi_session_add *isa)
cv_init(&is->is_login_cv, "iscsi_login");
#endif
/*
* Set some default values, from RFC 3720, section 12.
*
* These values are updated by the handoff IOCTL, but are
* needed prior to the handoff to support sending the ISER
* login PDU.
*/
is->is_conn->ic_max_recv_data_segment_length = 8192;
is->is_conn->ic_max_send_data_segment_length = 8192;
is->is_max_burst_length = 262144;
is->is_first_burst_length = 65536;
is->is_softc = sc;
sc->sc_last_session_id++;
is->is_id = sc->sc_last_session_id;
@ -1960,9 +1960,9 @@ iscsi_ioctl_session_list(struct iscsi_softc *sc, struct iscsi_session_list *isl)
iss.iss_data_digest = ISCSI_DIGEST_NONE;
iss.iss_max_send_data_segment_length =
is->is_max_send_data_segment_length;
is->is_conn->ic_max_send_data_segment_length;
iss.iss_max_recv_data_segment_length =
is->is_max_recv_data_segment_length;
is->is_conn->ic_max_recv_data_segment_length;
iss.iss_max_burst_length = is->is_max_burst_length;
iss.iss_first_burst_length = is->is_first_burst_length;
iss.iss_immediate_data = is->is_immediate_data;
@ -2330,10 +2330,10 @@ iscsi_action_scsiio(struct iscsi_session *is, union ccb *ccb)
ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len, is->is_first_burst_length);
len = is->is_first_burst_length;
}
if (len > is->is_max_send_data_segment_length) {
if (len > is->is_conn->ic_max_send_data_segment_length) {
ISCSI_SESSION_DEBUG(is, "len %zd -> %d", len,
is->is_max_send_data_segment_length);
len = is->is_max_send_data_segment_length;
is->is_conn->ic_max_send_data_segment_length);
len = is->is_conn->ic_max_send_data_segment_length;
}
error = icl_pdu_append_data(request, csio->data_ptr, len, M_NOWAIT);

2
sys/dev/iscsi/iscsi.h
View File

@ -67,8 +67,6 @@ struct iscsi_session {
uint8_t is_isid[6];
uint16_t is_tsih;
bool is_immediate_data;
int is_max_recv_data_segment_length;
int is_max_send_data_segment_length;
char is_target_alias[ISCSI_ALIAS_LEN];
TAILQ_HEAD(, iscsi_outstanding) is_outstanding;