Re: [PATCH] iscsi-target: Add login_keys_workaround attribute for non RFC initiators

From: Nicholas A. Bellinger
Date: Tue Jul 11 2017 - 05:20:07 EST

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Hey Robert,

Any chance to test this with your Flexboot PXE setup..?

Please give this a spin ASAP to verify it addresses the regression you
reported earlier, wrt FirstBurstLength not being proposed nor responded
to using Flexboot PXE.

Thank you.

On Fri, 2017-07-07 at 22:24 +0000, Nicholas A. Bellinger wrote:
> From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
>
> This patch re-introduces part of a long standing login workaround that
> was recently dropped by:
>
> commit 1c99de981f30b3e7868b8d20ce5479fa1c0fea46
> Author: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
> Date: Sun Apr 2 13:36:44 2017 -0700
>
> iscsi-target: Drop work-around for legacy GlobalSAN initiator
>
> Namely, the workaround for FirstBurstLength ended up being required by
> Mellanox Flexboot PXE boot ROMs as reported by Robert.
>
> So this patch re-adds the work-around for FirstBurstLength within
> iscsi_check_proposer_for_optional_reply(), and makes the key optional
> to respond when the initiator does not propose, nor respond to it.
>
> Also as requested by Arun, this patch introduces a new TPG attribute
> named 'login_keys_workaround' that controls the use of both the
> FirstBurstLength workaround, as well as the two other existing
> workarounds for gPXE iSCSI boot client.
>
> By default, the workaround is enabled with login_keys_workaround=1,
> since Mellanox FlexBoot requires it, and Arun has verified the Qlogic
> MSFT initiator already proposes FirstBurstLength, so it's uneffected
> by this re-adding this part of the original work-around.
>
> Reported-by: Robert LeBlanc <robert@xxxxxxxxxxxxx>
> Cc: Robert LeBlanc <robert@xxxxxxxxxxxxx>
> Cc: Arun Easi <arun.easi@xxxxxxxxxx>
> Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
> ---
> drivers/target/iscsi/iscsi_target_configfs.c | 2 ++
> drivers/target/iscsi/iscsi_target_nego.c | 6 ++--
> drivers/target/iscsi/iscsi_target_parameters.c | 41 ++++++++++++++++++--------
> drivers/target/iscsi/iscsi_target_parameters.h | 2 +-
> drivers/target/iscsi/iscsi_target_tpg.c | 19 ++++++++++++
> drivers/target/iscsi/iscsi_target_tpg.h | 1 +
> include/target/iscsi/iscsi_target_core.h | 9 ++++++
> 7 files changed, 64 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/target/iscsi/iscsi_target_configfs.c b/drivers/target/iscsi/iscsi_target_configfs.c
> index 535a8e0..0dd4c45 100644
> --- a/drivers/target/iscsi/iscsi_target_configfs.c
> +++ b/drivers/target/iscsi/iscsi_target_configfs.c
> @@ -781,6 +781,7 @@ static int lio_target_init_nodeacl(struct se_node_acl *se_nacl,
> DEF_TPG_ATTRIB(t10_pi);
> DEF_TPG_ATTRIB(fabric_prot_type);
> DEF_TPG_ATTRIB(tpg_enabled_sendtargets);
> +DEF_TPG_ATTRIB(login_keys_workaround);
>
> static struct configfs_attribute *lio_target_tpg_attrib_attrs[] = {
> &iscsi_tpg_attrib_attr_authentication,
> @@ -796,6 +797,7 @@ static int lio_target_init_nodeacl(struct se_node_acl *se_nacl,
> &iscsi_tpg_attrib_attr_t10_pi,
> &iscsi_tpg_attrib_attr_fabric_prot_type,
> &iscsi_tpg_attrib_attr_tpg_enabled_sendtargets,
> + &iscsi_tpg_attrib_attr_login_keys_workaround,
> NULL,
> };
>
> diff --git a/drivers/target/iscsi/iscsi_target_nego.c b/drivers/target/iscsi/iscsi_target_nego.c
> index 96df63f..7a6751f 100644
> --- a/drivers/target/iscsi/iscsi_target_nego.c
> +++ b/drivers/target/iscsi/iscsi_target_nego.c
> @@ -864,7 +864,8 @@ static int iscsi_target_handle_csg_zero(
> SENDER_TARGET,
> login->rsp_buf,
> &login->rsp_length,
> - conn->param_list);
> + conn->param_list,
> + conn->tpg->tpg_attrib.login_keys_workaround);
> if (ret < 0)
> return -1;
>
> @@ -934,7 +935,8 @@ static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_log
> SENDER_TARGET,
> login->rsp_buf,
> &login->rsp_length,
> - conn->param_list);
> + conn->param_list,
> + conn->tpg->tpg_attrib.login_keys_workaround);
> if (ret < 0) {
> iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
> ISCSI_LOGIN_STATUS_INIT_ERR);
> diff --git a/drivers/target/iscsi/iscsi_target_parameters.c b/drivers/target/iscsi/iscsi_target_parameters.c
> index fce6276..caab104 100644
> --- a/drivers/target/iscsi/iscsi_target_parameters.c
> +++ b/drivers/target/iscsi/iscsi_target_parameters.c
> @@ -765,7 +765,8 @@ static int iscsi_check_for_auth_key(char *key)
> return 0;
> }
>
> -static void iscsi_check_proposer_for_optional_reply(struct iscsi_param *param)
> +static void iscsi_check_proposer_for_optional_reply(struct iscsi_param *param,
> + bool keys_workaround)
> {
> if (IS_TYPE_BOOL_AND(param)) {
> if (!strcmp(param->value, NO))
> @@ -773,19 +774,31 @@ static void iscsi_check_proposer_for_optional_reply(struct iscsi_param *param)
> } else if (IS_TYPE_BOOL_OR(param)) {
> if (!strcmp(param->value, YES))
> SET_PSTATE_REPLY_OPTIONAL(param);
> - /*
> - * Required for gPXE iSCSI boot client
> - */
> - if (!strcmp(param->name, IMMEDIATEDATA))
> - SET_PSTATE_REPLY_OPTIONAL(param);
> +
> + if (keys_workaround) {
> + /*
> + * Required for gPXE iSCSI boot client
> + */
> + if (!strcmp(param->name, IMMEDIATEDATA))
> + SET_PSTATE_REPLY_OPTIONAL(param);
> + }
> } else if (IS_TYPE_NUMBER(param)) {
> if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH))
> SET_PSTATE_REPLY_OPTIONAL(param);
> - /*
> - * Required for gPXE iSCSI boot client
> - */
> - if (!strcmp(param->name, MAXCONNECTIONS))
> - SET_PSTATE_REPLY_OPTIONAL(param);
> +
> + if (keys_workaround) {
> + /*
> + * Required for Mellanox Flexboot PXE boot ROM
> + */
> + if (!strcmp(param->name, FIRSTBURSTLENGTH))
> + SET_PSTATE_REPLY_OPTIONAL(param);
> +
> + /*
> + * Required for gPXE iSCSI boot client
> + */
> + if (!strcmp(param->name, MAXCONNECTIONS))
> + SET_PSTATE_REPLY_OPTIONAL(param);
> + }
> } else if (IS_PHASE_DECLARATIVE(param))
> SET_PSTATE_REPLY_OPTIONAL(param);
> }
> @@ -1422,7 +1435,8 @@ int iscsi_encode_text_output(
> u8 sender,
> char *textbuf,
> u32 *length,
> - struct iscsi_param_list *param_list)
> + struct iscsi_param_list *param_list,
> + bool keys_workaround)
> {
> char *output_buf = NULL;
> struct iscsi_extra_response *er;
> @@ -1458,7 +1472,8 @@ int iscsi_encode_text_output(
> *length += 1;
> output_buf = textbuf + *length;
> SET_PSTATE_PROPOSER(param);
> - iscsi_check_proposer_for_optional_reply(param);
> + iscsi_check_proposer_for_optional_reply(param,
> + keys_workaround);
> pr_debug("Sending key: %s=%s\n",
> param->name, param->value);
> }
> diff --git a/drivers/target/iscsi/iscsi_target_parameters.h b/drivers/target/iscsi/iscsi_target_parameters.h
> index 9962ccf..c47b73f 100644
> --- a/drivers/target/iscsi/iscsi_target_parameters.h
> +++ b/drivers/target/iscsi/iscsi_target_parameters.h
> @@ -46,7 +46,7 @@ extern int iscsi_copy_param_list(struct iscsi_param_list **,
> extern int iscsi_update_param_value(struct iscsi_param *, char *);
> extern int iscsi_decode_text_input(u8, u8, char *, u32, struct iscsi_conn *);
> extern int iscsi_encode_text_output(u8, u8, char *, u32 *,
> - struct iscsi_param_list *);
> + struct iscsi_param_list *, bool);
> extern int iscsi_check_negotiated_keys(struct iscsi_param_list *);
> extern void iscsi_set_connection_parameters(struct iscsi_conn_ops *,
> struct iscsi_param_list *);
> diff --git a/drivers/target/iscsi/iscsi_target_tpg.c b/drivers/target/iscsi/iscsi_target_tpg.c
> index abaabba..594d07a 100644
> --- a/drivers/target/iscsi/iscsi_target_tpg.c
> +++ b/drivers/target/iscsi/iscsi_target_tpg.c
> @@ -227,6 +227,7 @@ static void iscsit_set_default_tpg_attribs(struct iscsi_portal_group *tpg)
> a->t10_pi = TA_DEFAULT_T10_PI;
> a->fabric_prot_type = TA_DEFAULT_FABRIC_PROT_TYPE;
> a->tpg_enabled_sendtargets = TA_DEFAULT_TPG_ENABLED_SENDTARGETS;
> + a->login_keys_workaround = TA_DEFAULT_LOGIN_KEYS_WORKAROUND;
> }
>
> int iscsit_tpg_add_portal_group(struct iscsi_tiqn *tiqn, struct iscsi_portal_group *tpg)
> @@ -895,3 +896,21 @@ int iscsit_ta_tpg_enabled_sendtargets(
>
> return 0;
> }
> +
> +int iscsit_ta_login_keys_workaround(
> + struct iscsi_portal_group *tpg,
> + u32 flag)
> +{
> + struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
> +
> + if ((flag != 0) && (flag != 1)) {
> + pr_err("Illegal value %d\n", flag);
> + return -EINVAL;
> + }
> +
> + a->login_keys_workaround = flag;
> + pr_debug("iSCSI_TPG[%hu] - TPG enabled bit for login keys workaround: %s ",
> + tpg->tpgt, (a->login_keys_workaround) ? "ON" : "OFF");
> +
> + return 0;
> +}
> diff --git a/drivers/target/iscsi/iscsi_target_tpg.h b/drivers/target/iscsi/iscsi_target_tpg.h
> index ceba298..59fd3ca 100644
> --- a/drivers/target/iscsi/iscsi_target_tpg.h
> +++ b/drivers/target/iscsi/iscsi_target_tpg.h
> @@ -48,5 +48,6 @@ extern int iscsit_tpg_del_network_portal(struct iscsi_portal_group *,
> extern int iscsit_ta_t10_pi(struct iscsi_portal_group *, u32);
> extern int iscsit_ta_fabric_prot_type(struct iscsi_portal_group *, u32);
> extern int iscsit_ta_tpg_enabled_sendtargets(struct iscsi_portal_group *, u32);
> +extern int iscsit_ta_login_keys_workaround(struct iscsi_portal_group *, u32);
>
> #endif /* ISCSI_TARGET_TPG_H */
> diff --git a/include/target/iscsi/iscsi_target_core.h b/include/target/iscsi/iscsi_target_core.h
> index 7948fc6..0ca1fb0 100644
> --- a/include/target/iscsi/iscsi_target_core.h
> +++ b/include/target/iscsi/iscsi_target_core.h
> @@ -66,6 +66,14 @@
> #define TA_DEFAULT_FABRIC_PROT_TYPE 0
> /* TPG status needs to be enabled to return sendtargets discovery endpoint info */
> #define TA_DEFAULT_TPG_ENABLED_SENDTARGETS 1
> +/*
> + * Used to control the sending of keys with optional to respond state bit,
> + * as a workaround for non RFC compliant initiators,that do not propose,
> + * nor respond to specific keys required for login to complete.
> + *
> + * See iscsi_check_proposer_for_optional_reply() for more details.
> + */
> +#define TA_DEFAULT_LOGIN_KEYS_WORKAROUND 1
>
> #define ISCSI_IOV_DATA_BUFFER 5
>
> @@ -768,6 +776,7 @@ struct iscsi_tpg_attrib {
> u8 t10_pi;
> u32 fabric_prot_type;
> u32 tpg_enabled_sendtargets;
> + u32 login_keys_workaround;
> struct iscsi_portal_group *tpg;
> };
>

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