octeontx2-af: Configure block LF's MSIX vector offset

Firmware configures a certain number of MSIX vectors to each of
enabled RVU PF/VF. When a block LF is attached to a PF/VF, number
of MSIX vectors needed by that LF are set aside (out of PF/VF's
total MSIX vectors) and LF's msix_offset is configured in HW.

Also added support for a RVU PF/VF to retrieve that block LF's
MSIX vector offset information from AF via mbox.
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/octeontx2/af/mbox.h

@@ -122,6 +122,7 @@ static inline struct mbox_msghdr *otx2_mbox_alloc_msg(struct otx2_mbox *mbox,
 M(READY,		0x001, msg_req, ready_msg_rsp)			\
 M(ATTACH_RESOURCES,	0x002, rsrc_attach, msg_rsp)			\
 M(DETACH_RESOURCES,	0x003, rsrc_detach, msg_rsp)			\
+M(MSIX_OFFSET,		0x004, msg_req, msix_offset_rsp)		\
 /* CGX mbox IDs (range 0x200 - 0x3FF) */				\
 /* NPA mbox IDs (range 0x400 - 0x5FF) */				\
 /* SSO/SSOW mbox IDs (range 0x600 - 0x7FF) */				\
@@ -190,4 +191,21 @@ struct rsrc_detach {
 	u8 cptlfs:1;
 };
 
+#define MSIX_VECTOR_INVALID	0xFFFF
+#define MAX_RVU_BLKLF_CNT	256
+
+struct msix_offset_rsp {
+	struct mbox_msghdr hdr;
+	u16  npa_msixoff;
+	u16  nix_msixoff;
+	u8   sso;
+	u8   ssow;
+	u8   timlfs;
+	u8   cptlfs;
+	u16  sso_msixoff[MAX_RVU_BLKLF_CNT];
+	u16  ssow_msixoff[MAX_RVU_BLKLF_CNT];
+	u16  timlf_msixoff[MAX_RVU_BLKLF_CNT];
+	u16  cptlf_msixoff[MAX_RVU_BLKLF_CNT];
+};
+
 #endif /* MBOX_H */

drivers/net/ethernet/marvell/octeontx2/af/rvu.c

@@ -24,6 +24,11 @@
 
 static int rvu_get_hwvf(struct rvu *rvu, int pcifunc);
 
+static void rvu_set_msix_offset(struct rvu *rvu, struct rvu_pfvf *pfvf,
+				struct rvu_block *block, int lf);
+static void rvu_clear_msix_offset(struct rvu *rvu, struct rvu_pfvf *pfvf,
+				  struct rvu_block *block, int lf);
+
 /* Supported devices */
 static const struct pci_device_id rvu_id_table[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, PCI_DEVID_OCTEONTX2_RVU_AF) },
@@ -74,6 +79,45 @@ int rvu_alloc_rsrc(struct rsrc_bmap *rsrc)
 	return id;
 }
 
+static int rvu_alloc_rsrc_contig(struct rsrc_bmap *rsrc, int nrsrc)
+{
+	int start;
+
+	if (!rsrc->bmap)
+		return -EINVAL;
+
+	start = bitmap_find_next_zero_area(rsrc->bmap, rsrc->max, 0, nrsrc, 0);
+	if (start >= rsrc->max)
+		return -ENOSPC;
+
+	bitmap_set(rsrc->bmap, start, nrsrc);
+	return start;
+}
+
+static void rvu_free_rsrc_contig(struct rsrc_bmap *rsrc, int nrsrc, int start)
+{
+	if (!rsrc->bmap)
+		return;
+	if (start >= rsrc->max)
+		return;
+
+	bitmap_clear(rsrc->bmap, start, nrsrc);
+}
+
+static bool rvu_rsrc_check_contig(struct rsrc_bmap *rsrc, int nrsrc)
+{
+	int start;
+
+	if (!rsrc->bmap)
+		return false;
+
+	start = bitmap_find_next_zero_area(rsrc->bmap, rsrc->max, 0, nrsrc, 0);
+	if (start >= rsrc->max)
+		return false;
+
+	return true;
+}
+
 void rvu_free_rsrc(struct rsrc_bmap *rsrc, int id)
 {
 	if (!rsrc->bmap)
@@ -102,6 +146,26 @@ int rvu_alloc_bitmap(struct rsrc_bmap *rsrc)
 	return 0;
 }
 
+/* Get block LF's HW index from a PF_FUNC's block slot number */
+int rvu_get_lf(struct rvu *rvu, struct rvu_block *block, u16 pcifunc, u16 slot)
+{
+	u16 match = 0;
+	int lf;
+
+	spin_lock(&rvu->rsrc_lock);
+	for (lf = 0; lf < block->lf.max; lf++) {
+		if (block->fn_map[lf] == pcifunc) {
+			if (slot == match) {
+				spin_unlock(&rvu->rsrc_lock);
+				return lf;
+			}
+			match++;
+		}
+	}
+	spin_unlock(&rvu->rsrc_lock);
+	return -ENODEV;
+}
+
 /* Convert BLOCK_TYPE_E to a BLOCK_ADDR_E.
  * Some silicon variants of OcteonTX2 supports
  * multiple blocks of same type.
@@ -236,6 +300,16 @@ inline int rvu_get_pf(u16 pcifunc)
 	return (pcifunc >> RVU_PFVF_PF_SHIFT) & RVU_PFVF_PF_MASK;
 }
 
+void rvu_get_pf_numvfs(struct rvu *rvu, int pf, int *numvfs, int *hwvf)
+{
+	u64 cfg;
+
+	/* Get numVFs attached to this PF and first HWVF */
+	cfg = rvu_read64(rvu, BLKADDR_RVUM, RVU_PRIV_PFX_CFG(pf));
+	*numvfs = (cfg >> 12) & 0xFF;
+	*hwvf = cfg & 0xFFF;
+}
+
 static int rvu_get_hwvf(struct rvu *rvu, int pcifunc)
 {
 	int pf, func;
@@ -330,20 +404,150 @@ static void rvu_scan_block(struct rvu *rvu, struct rvu_block *block)
 		pfvf = rvu_get_pfvf(rvu, (cfg >> 8) & 0xFFFF);
 		rvu_update_rsrc_map(rvu, pfvf, block,
 				    (cfg >> 8) & 0xFFFF, lf, true);
+
+		/* Set start MSIX vector for this LF within this PF/VF */
+		rvu_set_msix_offset(rvu, pfvf, block, lf);
 	}
 }
 
+static void rvu_check_min_msix_vec(struct rvu *rvu, int nvecs, int pf, int vf)
+{
+	int min_vecs;
+
+	if (!vf)
+		goto check_pf;
+
+	if (!nvecs) {
+		dev_warn(rvu->dev,
+			 "PF%d:VF%d is configured with zero msix vectors, %d\n",
+			 pf, vf - 1, nvecs);
+	}
+	return;
+
+check_pf:
+	if (pf == 0)
+		min_vecs = RVU_AF_INT_VEC_CNT + RVU_PF_INT_VEC_CNT;
+	else
+		min_vecs = RVU_PF_INT_VEC_CNT;
+
+	if (!(nvecs < min_vecs))
+		return;
+	dev_warn(rvu->dev,
+		 "PF%d is configured with too few vectors, %d, min is %d\n",
+		 pf, nvecs, min_vecs);
+}
+
+static int rvu_setup_msix_resources(struct rvu *rvu)
+{
+	struct rvu_hwinfo *hw = rvu->hw;
+	int pf, vf, numvfs, hwvf, err;
+	struct rvu_pfvf *pfvf;
+	int nvecs, offset;
+	u64 cfg;
+
+	for (pf = 0; pf < hw->total_pfs; pf++) {
+		cfg = rvu_read64(rvu, BLKADDR_RVUM, RVU_PRIV_PFX_CFG(pf));
+		/* If PF is not enabled, nothing to do */
+		if (!((cfg >> 20) & 0x01))
+			continue;
+
+		rvu_get_pf_numvfs(rvu, pf, &numvfs, &hwvf);
+
+		pfvf = &rvu->pf[pf];
+		/* Get num of MSIX vectors attached to this PF */
+		cfg = rvu_read64(rvu, BLKADDR_RVUM, RVU_PRIV_PFX_MSIX_CFG(pf));
+		pfvf->msix.max = ((cfg >> 32) & 0xFFF) + 1;
+		rvu_check_min_msix_vec(rvu, pfvf->msix.max, pf, 0);
+
+		/* Alloc msix bitmap for this PF */
+		err = rvu_alloc_bitmap(&pfvf->msix);
+		if (err)
+			return err;
+
+		/* Allocate memory for MSIX vector to RVU block LF mapping */
+		pfvf->msix_lfmap = devm_kcalloc(rvu->dev, pfvf->msix.max,
+						sizeof(u16), GFP_KERNEL);
+		if (!pfvf->msix_lfmap)
+			return -ENOMEM;
+
+		/* For PF0 (AF) firmware will set msix vector offsets for
+		 * AF, block AF and PF0_INT vectors, so jump to VFs.
+		 */
+		if (!pf)
+			goto setup_vfmsix;
+
+		/* Set MSIX offset for PF's 'RVU_PF_INT_VEC' vectors.
+		 * These are allocated on driver init and never freed,
+		 * so no need to set 'msix_lfmap' for these.
+		 */
+		cfg = rvu_read64(rvu, BLKADDR_RVUM, RVU_PRIV_PFX_INT_CFG(pf));
+		nvecs = (cfg >> 12) & 0xFF;
+		cfg &= ~0x7FFULL;
+		offset = rvu_alloc_rsrc_contig(&pfvf->msix, nvecs);
+		rvu_write64(rvu, BLKADDR_RVUM,
+			    RVU_PRIV_PFX_INT_CFG(pf), cfg | offset);
+setup_vfmsix:
+		/* Alloc msix bitmap for VFs */
+		for (vf = 0; vf < numvfs; vf++) {
+			pfvf =  &rvu->hwvf[hwvf + vf];
+			/* Get num of MSIX vectors attached to this VF */
+			cfg = rvu_read64(rvu, BLKADDR_RVUM,
+					 RVU_PRIV_PFX_MSIX_CFG(pf));
+			pfvf->msix.max = (cfg & 0xFFF) + 1;
+			rvu_check_min_msix_vec(rvu, pfvf->msix.max, pf, vf + 1);
+
+			/* Alloc msix bitmap for this VF */
+			err = rvu_alloc_bitmap(&pfvf->msix);
+			if (err)
+				return err;
+
+			pfvf->msix_lfmap =
+				devm_kcalloc(rvu->dev, pfvf->msix.max,
+					     sizeof(u16), GFP_KERNEL);
+			if (!pfvf->msix_lfmap)
+				return -ENOMEM;
+
+			/* Set MSIX offset for HWVF's 'RVU_VF_INT_VEC' vectors.
+			 * These are allocated on driver init and never freed,
+			 * so no need to set 'msix_lfmap' for these.
+			 */
+			cfg = rvu_read64(rvu, BLKADDR_RVUM,
+					 RVU_PRIV_HWVFX_INT_CFG(hwvf + vf));
+			nvecs = (cfg >> 12) & 0xFF;
+			cfg &= ~0x7FFULL;
+			offset = rvu_alloc_rsrc_contig(&pfvf->msix, nvecs);
+			rvu_write64(rvu, BLKADDR_RVUM,
+				    RVU_PRIV_HWVFX_INT_CFG(hwvf + vf),
+				    cfg | offset);
+		}
+	}
+
+	return 0;
+}
+
 static void rvu_free_hw_resources(struct rvu *rvu)
 {
 	struct rvu_hwinfo *hw = rvu->hw;
 	struct rvu_block *block;
+	struct rvu_pfvf  *pfvf;
 	int id;
 
-	/* Free all bitmaps */
+	/* Free block LF bitmaps */
 	for (id = 0; id < BLK_COUNT; id++) {
 		block = &hw->block[id];
 		kfree(block->lf.bmap);
 	}
+
+	/* Free MSIX bitmaps */
+	for (id = 0; id < hw->total_pfs; id++) {
+		pfvf = &rvu->pf[id];
+		kfree(pfvf->msix.bmap);
+	}
+
+	for (id = 0; id < hw->total_vfs; id++) {
+		pfvf = &rvu->hwvf[id];
+		kfree(pfvf->msix.bmap);
+	}
 }
 
 static int rvu_setup_hw_resources(struct rvu *rvu)
@@ -499,6 +703,12 @@ static int rvu_setup_hw_resources(struct rvu *rvu)
 	if (!rvu->hwvf)
 		return -ENOMEM;
 
+	spin_lock_init(&rvu->rsrc_lock);
+
+	err = rvu_setup_msix_resources(rvu);
+	if (err)
+		return err;
+
 	for (blkid = 0; blkid < BLK_COUNT; blkid++) {
 		block = &hw->block[blkid];
 		if (!block->lf.bmap)
@@ -516,8 +726,6 @@ static int rvu_setup_hw_resources(struct rvu *rvu)
 		rvu_scan_block(rvu, block);
 	}
 
-	spin_lock_init(&rvu->rsrc_lock);
-
 	return 0;
 }
 
@@ -603,6 +811,9 @@ static void rvu_detach_block(struct rvu *rvu, int pcifunc, int blktype)
 
 		/* Free the resource */
 		rvu_free_rsrc(&block->lf, lf);
+
+		/* Clear MSIX vector offset for this LF */
+		rvu_clear_msix_offset(rvu, pfvf, block, lf);
 	}
 }
 
@@ -696,6 +907,9 @@ static void rvu_attach_block(struct rvu *rvu, int pcifunc,
 			    (lf << block->lfshift), cfg);
 		rvu_update_rsrc_map(rvu, pfvf, block,
 				    pcifunc, lf, true);
+
+		/* Set start MSIX vector for this LF within this PF/VF */
+		rvu_set_msix_offset(rvu, pfvf, block, lf);
 	}
 }
 
@@ -871,6 +1085,119 @@ static int rvu_mbox_handler_ATTACH_RESOURCES(struct rvu *rvu,
 	return err;
 }
 
+static u16 rvu_get_msix_offset(struct rvu *rvu, struct rvu_pfvf *pfvf,
+			       int blkaddr, int lf)
+{
+	u16 vec;
+
+	if (lf < 0)
+		return MSIX_VECTOR_INVALID;
+
+	for (vec = 0; vec < pfvf->msix.max; vec++) {
+		if (pfvf->msix_lfmap[vec] == MSIX_BLKLF(blkaddr, lf))
+			return vec;
+	}
+	return MSIX_VECTOR_INVALID;
+}
+
+static void rvu_set_msix_offset(struct rvu *rvu, struct rvu_pfvf *pfvf,
+				struct rvu_block *block, int lf)
+{
+	u16 nvecs, vec, offset;
+	u64 cfg;
+
+	cfg = rvu_read64(rvu, block->addr, block->msixcfg_reg |
+			 (lf << block->lfshift));
+	nvecs = (cfg >> 12) & 0xFF;
+
+	/* Check and alloc MSIX vectors, must be contiguous */
+	if (!rvu_rsrc_check_contig(&pfvf->msix, nvecs))
+		return;
+
+	offset = rvu_alloc_rsrc_contig(&pfvf->msix, nvecs);
+
+	/* Config MSIX offset in LF */
+	rvu_write64(rvu, block->addr, block->msixcfg_reg |
+		    (lf << block->lfshift), (cfg & ~0x7FFULL) | offset);
+
+	/* Update the bitmap as well */
+	for (vec = 0; vec < nvecs; vec++)
+		pfvf->msix_lfmap[offset + vec] = MSIX_BLKLF(block->addr, lf);
+}
+
+static void rvu_clear_msix_offset(struct rvu *rvu, struct rvu_pfvf *pfvf,
+				  struct rvu_block *block, int lf)
+{
+	u16 nvecs, vec, offset;
+	u64 cfg;
+
+	cfg = rvu_read64(rvu, block->addr, block->msixcfg_reg |
+			 (lf << block->lfshift));
+	nvecs = (cfg >> 12) & 0xFF;
+
+	/* Clear MSIX offset in LF */
+	rvu_write64(rvu, block->addr, block->msixcfg_reg |
+		    (lf << block->lfshift), cfg & ~0x7FFULL);
+
+	offset = rvu_get_msix_offset(rvu, pfvf, block->addr, lf);
+
+	/* Update the mapping */
+	for (vec = 0; vec < nvecs; vec++)
+		pfvf->msix_lfmap[offset + vec] = 0;
+
+	/* Free the same in MSIX bitmap */
+	rvu_free_rsrc_contig(&pfvf->msix, nvecs, offset);
+}
+
+static int rvu_mbox_handler_MSIX_OFFSET(struct rvu *rvu, struct msg_req *req,
+					struct msix_offset_rsp *rsp)
+{
+	struct rvu_hwinfo *hw = rvu->hw;
+	u16 pcifunc = req->hdr.pcifunc;
+	struct rvu_pfvf *pfvf;
+	int lf, slot;
+
+	pfvf = rvu_get_pfvf(rvu, pcifunc);
+	if (!pfvf->msix.bmap)
+		return 0;
+
+	/* Set MSIX offsets for each block's LFs attached to this PF/VF */
+	lf = rvu_get_lf(rvu, &hw->block[BLKADDR_NPA], pcifunc, 0);
+	rsp->npa_msixoff = rvu_get_msix_offset(rvu, pfvf, BLKADDR_NPA, lf);
+
+	lf = rvu_get_lf(rvu, &hw->block[BLKADDR_NIX0], pcifunc, 0);
+	rsp->nix_msixoff = rvu_get_msix_offset(rvu, pfvf, BLKADDR_NIX0, lf);
+
+	rsp->sso = pfvf->sso;
+	for (slot = 0; slot < rsp->sso; slot++) {
+		lf = rvu_get_lf(rvu, &hw->block[BLKADDR_SSO], pcifunc, slot);
+		rsp->sso_msixoff[slot] =
+			rvu_get_msix_offset(rvu, pfvf, BLKADDR_SSO, lf);
+	}
+
+	rsp->ssow = pfvf->ssow;
+	for (slot = 0; slot < rsp->ssow; slot++) {
+		lf = rvu_get_lf(rvu, &hw->block[BLKADDR_SSOW], pcifunc, slot);
+		rsp->ssow_msixoff[slot] =
+			rvu_get_msix_offset(rvu, pfvf, BLKADDR_SSOW, lf);
+	}
+
+	rsp->timlfs = pfvf->timlfs;
+	for (slot = 0; slot < rsp->timlfs; slot++) {
+		lf = rvu_get_lf(rvu, &hw->block[BLKADDR_TIM], pcifunc, slot);
+		rsp->timlf_msixoff[slot] =
+			rvu_get_msix_offset(rvu, pfvf, BLKADDR_TIM, lf);
+	}
+
+	rsp->cptlfs = pfvf->cptlfs;
+	for (slot = 0; slot < rsp->cptlfs; slot++) {
+		lf = rvu_get_lf(rvu, &hw->block[BLKADDR_CPT0], pcifunc, slot);
+		rsp->cptlf_msixoff[slot] =
+			rvu_get_msix_offset(rvu, pfvf, BLKADDR_CPT0, lf);
+	}
+	return 0;
+}
+
 static int rvu_process_mbox_msg(struct rvu *rvu, int devid,
 				struct mbox_msghdr *req)
 {

drivers/net/ethernet/marvell/octeontx2/af/rvu.h

@@ -65,6 +65,11 @@ struct rvu_pfvf {
 	u16		ssow;
 	u16		cptlfs;
 	u16		timlfs;
+
+	/* Block LF's MSIX vector info */
+	struct rsrc_bmap msix;      /* Bitmap for MSIX vector alloc */
+#define MSIX_BLKLF(blkaddr, lf) (((blkaddr) << 8) | ((lf) & 0xFF))
+	u16		 *msix_lfmap; /* Vector to block LF mapping */
 };
 
 struct rvu_hwinfo {
@@ -126,7 +131,9 @@ void rvu_free_rsrc(struct rsrc_bmap *rsrc, int id);
 int rvu_rsrc_free_count(struct rsrc_bmap *rsrc);
 int rvu_get_pf(u16 pcifunc);
 struct rvu_pfvf *rvu_get_pfvf(struct rvu *rvu, int pcifunc);
+void rvu_get_pf_numvfs(struct rvu *rvu, int pf, int *numvfs, int *hwvf);
 bool is_block_implemented(struct rvu_hwinfo *hw, int blkaddr);
+int rvu_get_lf(struct rvu *rvu, struct rvu_block *block, u16 pcifunc, u16 slot);
 int rvu_get_blkaddr(struct rvu *rvu, int blktype, u16 pcifunc);
 int rvu_poll_reg(struct rvu *rvu, u64 block, u64 offset, u64 mask, bool zero);
 

drivers/net/ethernet/marvell/octeontx2/af/rvu_struct.h

@@ -54,6 +54,7 @@ enum rvu_af_int_vec_e {
 	RVU_AF_INT_VEC_PFME   = 0x2,
 	RVU_AF_INT_VEC_GEN    = 0x3,
 	RVU_AF_INT_VEC_MBOX   = 0x4,
+	RVU_AF_INT_VEC_CNT    = 0x5,
 };
 
 /**
@@ -67,6 +68,7 @@ enum rvu_pf_int_vec_e {
 	RVU_PF_INT_VEC_VFPF_MBOX0 = 0x4,
 	RVU_PF_INT_VEC_VFPF_MBOX1 = 0x5,
 	RVU_PF_INT_VEC_AFPF_MBOX  = 0x6,
+	RVU_PF_INT_VEC_CNT	  = 0x7,
 };
 
 #endif /* RVU_STRUCT_H */