scsi: lpfc: Add EDC ELS support

When congestion management is enabled, issue EDC ELS to register congestion
signaling capabilities with the fabric. The response handling will process
the fabric parameters and set the reporting parameters.

Similarly, add support for receiving an EDC request from the fabric
generating a corresponding response.

Implement handlers for congestion signals from the fabric and maintain
statistics for them.

Link: https://lore.kernel.org/r/20210816162901.121235-6-jsmart2021@gmail.com
Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/drivers/scsi/lpfc/lpfc_hw4.h b/drivers/scsi/lpfc/lpfc_hw4.h
index 65bb4a66ccf0..ebee1d302a49 100644
--- a/drivers/scsi/lpfc/lpfc_hw4.h
+++ b/drivers/scsi/lpfc/lpfc_hw4.h
@@ -2813,6 +2813,12 @@ struct lpfc_mbx_read_config {
 #define lpfc_mbx_rd_conf_extnts_inuse_SHIFT	31
 #define lpfc_mbx_rd_conf_extnts_inuse_MASK	0x00000001
 #define lpfc_mbx_rd_conf_extnts_inuse_WORD	word1
+#define lpfc_mbx_rd_conf_wcs_SHIFT		28	/* warning signaling */
+#define lpfc_mbx_rd_conf_wcs_MASK		0x00000001
+#define lpfc_mbx_rd_conf_wcs_WORD		word1
+#define lpfc_mbx_rd_conf_acs_SHIFT		27	/* alarm signaling */
+#define lpfc_mbx_rd_conf_acs_MASK		0x00000001
+#define lpfc_mbx_rd_conf_acs_WORD		word1
 	uint32_t word2;
 #define lpfc_mbx_rd_conf_lnk_numb_SHIFT		0
 #define lpfc_mbx_rd_conf_lnk_numb_MASK		0x0000003F
@@ -3393,6 +3399,7 @@ struct lpfc_sli4_parameters {
 
 #define LPFC_SET_UE_RECOVERY		0x10
 #define LPFC_SET_MDS_DIAGS		0x12
+#define LPFC_SET_CGN_SIGNAL		0x1f
 #define LPFC_SET_DUAL_DUMP		0x1e
 #define LPFC_SET_ENABLE_MI		0x21
 struct lpfc_mbx_set_feature {
@@ -3409,6 +3416,9 @@ struct lpfc_mbx_set_feature {
 #define lpfc_mbx_set_feature_mds_deep_loopbk_SHIFT  1
 #define lpfc_mbx_set_feature_mds_deep_loopbk_MASK   0x00000001
 #define lpfc_mbx_set_feature_mds_deep_loopbk_WORD   word6
+#define lpfc_mbx_set_feature_CGN_warn_freq_SHIFT 0
+#define lpfc_mbx_set_feature_CGN_warn_freq_MASK  0x0000ffff
+#define lpfc_mbx_set_feature_CGN_warn_freq_WORD  word6
 #define lpfc_mbx_set_feature_dd_SHIFT		0
 #define lpfc_mbx_set_feature_dd_MASK		0x00000001
 #define lpfc_mbx_set_feature_dd_WORD		word6
@@ -3431,6 +3441,13 @@ struct lpfc_mbx_set_feature {
 #define lpfc_mbx_set_feature_UESR_SHIFT 16
 #define lpfc_mbx_set_feature_UESR_MASK  0x0000ffff
 #define lpfc_mbx_set_feature_UESR_WORD  word7
+#define lpfc_mbx_set_feature_CGN_alarm_freq_SHIFT 0
+#define lpfc_mbx_set_feature_CGN_alarm_freq_MASK  0x0000ffff
+#define lpfc_mbx_set_feature_CGN_alarm_freq_WORD  word7
+	u32 word8;
+#define lpfc_mbx_set_feature_CGN_acqe_freq_SHIFT 0
+#define lpfc_mbx_set_feature_CGN_acqe_freq_MASK  0x000000ff
+#define lpfc_mbx_set_feature_CGN_acqe_freq_WORD  word8
 };
 
 
@@ -4173,6 +4190,19 @@ struct lpfc_acqe_misconfigured_event {
 #define LPFC_SLI_EVENT_STATUS_UNCERTIFIED	0x05
 };
 
+struct lpfc_acqe_cgn_signal {
+	u32 word0;
+#define lpfc_warn_acqe_SHIFT		0
+#define lpfc_warn_acqe_MASK		0x7FFFFFFF
+#define lpfc_warn_acqe_WORD		word0
+#define lpfc_imm_acqe_SHIFT		31
+#define lpfc_imm_acqe_MASK		0x1
+#define lpfc_imm_acqe_WORD		word0
+	u32 alarm_cnt;
+	u32 word2;
+	u32 trailer;
+};
+
 struct lpfc_acqe_sli {
 	uint32_t event_data1;
 	uint32_t event_data2;
@@ -4187,6 +4217,7 @@ struct lpfc_acqe_sli {
 #define LPFC_SLI_EVENT_TYPE_REMOTE_DPORT	0xA
 #define LPFC_SLI_EVENT_TYPE_MISCONF_FAWWN	0xF
 #define LPFC_SLI_EVENT_TYPE_EEPROM_FAILURE	0x10
+#define LPFC_SLI_EVENT_TYPE_CGN_SIGNAL		0x11
 };
 
 /*
@@ -4815,6 +4846,17 @@ struct lpfc_grp_hdr {
 #define LPFC_FW_RESET	2
 #define LPFC_DV_RESET	3
 
+/* On some kernels, enum fc_ls_tlv_dtag does not have
+ * these 2 enums defined, on other kernels it does.
+ * To get aound this we need to add these 2 defines here.
+ */
+#ifndef ELS_DTAG_LNK_FAULT_CAP
+#define ELS_DTAG_LNK_FAULT_CAP        0x0001000D
+#endif
+#ifndef ELS_DTAG_CG_SIGNAL_CAP
+#define ELS_DTAG_CG_SIGNAL_CAP        0x0001000F
+#endif
+
 /*
  * Initializer useful for decoding FPIN string table.
  */
@@ -4823,6 +4865,22 @@ struct lpfc_grp_hdr {
 	{ FPIN_CONGN_SEVERITY_ERROR,		"Alarm" },	\
 }
 
+/* EDC supports two descriptors.  When allocated, it is the
+ * size of this structure plus each supported descriptor.
+ */
+struct lpfc_els_edc_req {
+	struct fc_els_edc               edc;       /* hdr up to descriptors */
+	struct fc_diag_cg_sig_desc      cgn_desc;  /* 1st descriptor */
+};
+
+/* Minimum structure defines for the EDC response.
+ * Balance is in buffer.
+ */
+struct lpfc_els_edc_rsp {
+	struct fc_els_edc_resp          edc_rsp;   /* hdr up to descriptors */
+	struct fc_diag_cg_sig_desc      cgn_desc;  /* 1st descriptor */
+};
+
 /* Used for logging FPIN messages */
 #define LPFC_FPIN_WWPN_LINE_SZ  128
 #define LPFC_FPIN_WWPN_LINE_CNT 6