bnxt_en: Use msix_vec_per_pf_max and msix_vec_per_pf_min devlink params.

This patch adds support for following generic permanent mode
devlink parameters. They can be modified using devlink param
commands.

msix_vec_per_pf_max - This param sets the number of MSIX vectors
that the device requests from the host on driver initialization.
This value is set in the device which limits MSIX vectors per PF.

msix_vec_per_pf_min - This param sets the number of minimal MSIX
vectors required for the device initialization. Value 0 indicates
a default value is selected. This value is set in the device which
limits MSIX vectors per PF.

Cc: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c

@@ -26,6 +26,10 @@ static const struct bnxt_dl_nvm_param nvm_params[] = {
 	 BNXT_NVM_SHARED_CFG, 1},
 	{DEVLINK_PARAM_GENERIC_ID_IGNORE_ARI, NVM_OFF_IGNORE_ARI,
 	 BNXT_NVM_SHARED_CFG, 1},
+	{DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MAX,
+	 NVM_OFF_MSIX_VEC_PER_PF_MAX, BNXT_NVM_SHARED_CFG, 10},
+	{DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MIN,
+	 NVM_OFF_MSIX_VEC_PER_PF_MIN, BNXT_NVM_SHARED_CFG, 7},
 };
 
 static int bnxt_hwrm_nvm_req(struct bnxt *bp, u32 param_id, void *msg,
@@ -57,8 +61,22 @@ static int bnxt_hwrm_nvm_req(struct bnxt *bp, u32 param_id, void *msg,
 		idx = bp->pf.fw_fid - BNXT_FIRST_PF_FID;
 
 	bytesize = roundup(nvm_param.num_bits, BITS_PER_BYTE) / BITS_PER_BYTE;
+	switch (bytesize) {
+	case 1:
 		if (nvm_param.num_bits == 1)
 			buf = &val->vbool;
+		else
+			buf = &val->vu8;
+		break;
+	case 2:
+		buf = &val->vu16;
+		break;
+	case 4:
+		buf = &val->vu32;
+		break;
+	default:
+		return -EFAULT;
+	}
 
 	data_addr = dma_zalloc_coherent(&bp->pdev->dev, bytesize,
 					&data_dma_addr, GFP_KERNEL);
@@ -109,6 +127,26 @@ static int bnxt_dl_nvm_param_set(struct devlink *dl, u32 id,
 	return bnxt_hwrm_nvm_req(bp, id, &req, sizeof(req), &ctx->val);
 }
 
+static int bnxt_dl_msix_validate(struct devlink *dl, u32 id,
+				 union devlink_param_value val,
+				 struct netlink_ext_ack *extack)
+{
+	int max_val;
+
+	if (id == DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MAX)
+		max_val = BNXT_MSIX_VEC_MAX;
+
+	if (id == DEVLINK_PARAM_GENERIC_ID_MSIX_VEC_PER_PF_MIN)
+		max_val = BNXT_MSIX_VEC_MIN_MAX;
+
+	if (val.vu32 < 0 || val.vu32 > max_val) {
+		NL_SET_ERR_MSG_MOD(extack, "MSIX value is exceeding the range");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static const struct devlink_param bnxt_dl_params[] = {
 	DEVLINK_PARAM_GENERIC(ENABLE_SRIOV,
 			      BIT(DEVLINK_PARAM_CMODE_PERMANENT),
@@ -118,6 +156,14 @@ static const struct devlink_param bnxt_dl_params[] = {
 			      BIT(DEVLINK_PARAM_CMODE_PERMANENT),
 			      bnxt_dl_nvm_param_get, bnxt_dl_nvm_param_set,
 			      NULL),
+	DEVLINK_PARAM_GENERIC(MSIX_VEC_PER_PF_MAX,
+			      BIT(DEVLINK_PARAM_CMODE_PERMANENT),
+			      bnxt_dl_nvm_param_get, bnxt_dl_nvm_param_set,
+			      bnxt_dl_msix_validate),
+	DEVLINK_PARAM_GENERIC(MSIX_VEC_PER_PF_MIN,
+			      BIT(DEVLINK_PARAM_CMODE_PERMANENT),
+			      bnxt_dl_nvm_param_get, bnxt_dl_nvm_param_set,
+			      bnxt_dl_msix_validate),
 };
 
 int bnxt_dl_register(struct bnxt *bp)

drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.h

@@ -33,9 +33,14 @@ static inline void bnxt_link_bp_to_dl(struct bnxt *bp, struct devlink *dl)
 	}
 }
 
+#define NVM_OFF_MSIX_VEC_PER_PF_MAX	108
+#define NVM_OFF_MSIX_VEC_PER_PF_MIN	114
 #define NVM_OFF_IGNORE_ARI		164
 #define NVM_OFF_ENABLE_SRIOV		401
 
+#define BNXT_MSIX_VEC_MAX	1280
+#define BNXT_MSIX_VEC_MIN_MAX	128
+
 enum bnxt_nvm_dir_type {
 	BNXT_NVM_SHARED_CFG = 40,
 	BNXT_NVM_PORT_CFG,