bnxt_en: Support RSS contexts in ethtool .{get|set}_rxfh()

Support up to 32 RSS contexts per device if supported by the device.

Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20240325222902.220712-11-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -5939,8 +5939,8 @@ static void bnxt_hwrm_vnic_update_tunl_tpa(struct bnxt *bp,
 	req->tnl_tpa_en_bitmap = cpu_to_le32(tunl_tpa_bmap);
 }
 
-static int bnxt_hwrm_vnic_set_tpa(struct bnxt *bp, struct bnxt_vnic_info *vnic,
+int bnxt_hwrm_vnic_set_tpa(struct bnxt *bp, struct bnxt_vnic_info *vnic,
-				  u32 tpa_flags)
+			   u32 tpa_flags)
 {
 	u16 max_aggs = VNIC_TPA_CFG_REQ_MAX_AGGS_MAX;
 	struct hwrm_vnic_tpa_cfg_input *req;
@@ -6129,6 +6129,8 @@ static void bnxt_fill_hw_rss_tbl_p5(struct bnxt *bp,
 
 		if (vnic->flags & BNXT_VNIC_NTUPLE_FLAG)
 			j = ethtool_rxfh_indir_default(i, bp->rx_nr_rings);
+		else if (vnic->flags & BNXT_VNIC_RSSCTX_FLAG)
+			j = vnic->rss_ctx->rss_indir_tbl[i];
 		else
 			j = bp->rss_indir_tbl[i];
 		rxr = &bp->rx_ring[j];
@@ -6423,9 +6425,9 @@ static void bnxt_hwrm_vnic_free(struct bnxt *bp)
 		bnxt_hwrm_vnic_free_one(bp, &bp->vnic_info[i]);
 }
 
-static int bnxt_hwrm_vnic_alloc(struct bnxt *bp, struct bnxt_vnic_info *vnic,
+int bnxt_hwrm_vnic_alloc(struct bnxt *bp, struct bnxt_vnic_info *vnic,
-				unsigned int start_rx_ring_idx,
+			 unsigned int start_rx_ring_idx,
-				unsigned int nr_rings)
+			 unsigned int nr_rings)
 {
 	unsigned int i, j, grp_idx, end_idx = start_rx_ring_idx + nr_rings;
 	struct hwrm_vnic_alloc_output *resp;
@@ -9852,7 +9854,7 @@ int bnxt_hwrm_vnic_rss_cfg_p5(struct bnxt *bp, struct bnxt_vnic_info *vnic)
 	return rc;
 }
 
-static int __bnxt_setup_vnic_p5(struct bnxt *bp, struct bnxt_vnic_info *vnic)
+int __bnxt_setup_vnic_p5(struct bnxt *bp, struct bnxt_vnic_info *vnic)
 {
 	int rc, i, nr_ctxs;
 
@@ -9939,15 +9941,46 @@ static int bnxt_alloc_rfs_vnics(struct bnxt *bp)
 void bnxt_del_one_rss_ctx(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 			  bool all)
 {
+	struct bnxt_vnic_info *vnic = &rss_ctx->vnic;
+	int i;
+
+	bnxt_hwrm_vnic_free_one(bp, &rss_ctx->vnic);
+	for (i = 0; i < BNXT_MAX_CTX_PER_VNIC; i++) {
+		if (vnic->fw_rss_cos_lb_ctx[i] != INVALID_HW_RING_ID)
+			bnxt_hwrm_vnic_ctx_free_one(bp, vnic, i);
+	}
 	if (!all)
 		return;
 
+	if (vnic->rss_table)
+		dma_free_coherent(&bp->pdev->dev, vnic->rss_table_size,
+				  vnic->rss_table,
+				  vnic->rss_table_dma_addr);
+	kfree(rss_ctx->rss_indir_tbl);
 	list_del(&rss_ctx->list);
 	bp->num_rss_ctx--;
 	clear_bit(rss_ctx->index, bp->rss_ctx_bmap);
 	kfree(rss_ctx);
 }
 
+static void bnxt_hwrm_realloc_rss_ctx_vnic(struct bnxt *bp)
+{
+	bool set_tpa = !!(bp->flags & BNXT_FLAG_TPA);
+	struct bnxt_rss_ctx *rss_ctx, *tmp;
+
+	list_for_each_entry_safe(rss_ctx, tmp, &bp->rss_ctx_list, list) {
+		struct bnxt_vnic_info *vnic = &rss_ctx->vnic;
+
+		if (bnxt_hwrm_vnic_alloc(bp, vnic, 0, bp->rx_nr_rings) ||
+		    bnxt_hwrm_vnic_set_tpa(bp, vnic, set_tpa) ||
+		    __bnxt_setup_vnic_p5(bp, vnic)) {
+			netdev_err(bp->dev, "Failed to restore RSS ctx %d\n",
+				   rss_ctx->index);
+			bnxt_del_one_rss_ctx(bp, rss_ctx, true);
+		}
+	}
+}
+
 struct bnxt_rss_ctx *bnxt_alloc_rss_ctx(struct bnxt *bp)
 {
 	struct bnxt_rss_ctx *rss_ctx = NULL;
@@ -11829,6 +11862,8 @@ static int __bnxt_open_nic(struct bnxt *bp, bool irq_re_init, bool link_re_init)
 		bnxt_vf_reps_open(bp);
 	bnxt_ptp_init_rtc(bp, true);
 	bnxt_ptp_cfg_tstamp_filters(bp);
+	if (BNXT_SUPPORTS_MULTI_RSS_CTX(bp))
+		bnxt_hwrm_realloc_rss_ctx_vnic(bp);
 	bnxt_cfg_usr_fltrs(bp);
 	return 0;
 
@@ -11977,6 +12012,8 @@ static void __bnxt_close_nic(struct bnxt *bp, bool irq_re_init,
 	while (bnxt_drv_busy(bp))
 		msleep(20);
 
+	if (BNXT_SUPPORTS_MULTI_RSS_CTX(bp))
+		bnxt_clear_rss_ctxs(bp, false);
 	/* Flush rings and disable interrupts */
 	bnxt_shutdown_nic(bp, irq_re_init);
 

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

@@ -1270,6 +1270,7 @@ struct bnxt_rss_ctx {
 
 #define BNXT_MAX_ETH_RSS_CTX	32
 #define BNXT_RSS_CTX_BMAP_LEN	(BNXT_MAX_ETH_RSS_CTX + 1)
+#define BNXT_VNIC_ID_INVALID	0xffffffff
 
 struct bnxt_hw_rings {
 	int tx;
@@ -2714,11 +2715,16 @@ int bnxt_hwrm_cfa_ntuple_filter_free(struct bnxt *bp,
 				     struct bnxt_ntuple_filter *fltr);
 int bnxt_hwrm_cfa_ntuple_filter_alloc(struct bnxt *bp,
 				      struct bnxt_ntuple_filter *fltr);
+int bnxt_hwrm_vnic_set_tpa(struct bnxt *bp, struct bnxt_vnic_info *vnic,
+			   u32 tpa_flags);
 void bnxt_fill_ipv6_mask(__be32 mask[4]);
 int bnxt_alloc_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx);
 void bnxt_set_dflt_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx);
 int bnxt_get_nr_rss_ctxs(struct bnxt *bp, int rx_rings);
 int bnxt_hwrm_vnic_cfg(struct bnxt *bp, struct bnxt_vnic_info *vnic);
+int bnxt_hwrm_vnic_alloc(struct bnxt *bp, struct bnxt_vnic_info *vnic,
+			 unsigned int start_rx_ring_idx,
+			 unsigned int nr_rings);
 int __bnxt_hwrm_get_tx_rings(struct bnxt *bp, u16 fid, int *tx_rings);
 int bnxt_nq_rings_in_use(struct bnxt *bp);
 int bnxt_hwrm_set_coal(struct bnxt *);
@@ -2745,6 +2751,7 @@ int bnxt_hwrm_func_resc_qcaps(struct bnxt *bp, bool all);
 int bnxt_hwrm_func_qcaps(struct bnxt *bp);
 int bnxt_hwrm_fw_set_time(struct bnxt *);
 int bnxt_hwrm_vnic_rss_cfg_p5(struct bnxt *bp, struct bnxt_vnic_info *vnic);
+int __bnxt_setup_vnic_p5(struct bnxt *bp, struct bnxt_vnic_info *vnic);
 void bnxt_del_one_rss_ctx(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 			  bool all);
 struct bnxt_rss_ctx *bnxt_alloc_rss_ctx(struct bnxt *bp);

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

@@ -1207,6 +1207,36 @@ static int bnxt_grxclsrule(struct bnxt *bp, struct ethtool_rxnfc *cmd)
 	return rc;
 }
 
+static struct bnxt_rss_ctx *bnxt_get_rss_ctx_from_index(struct bnxt *bp,
+							u32 index)
+{
+	struct bnxt_rss_ctx *rss_ctx, *tmp;
+
+	list_for_each_entry_safe(rss_ctx, tmp, &bp->rss_ctx_list, list)
+		if (rss_ctx->index == index)
+			return rss_ctx;
+	return NULL;
+}
+
+static int bnxt_alloc_rss_ctx_rss_table(struct bnxt *bp,
+					struct bnxt_rss_ctx *rss_ctx)
+{
+	int size = L1_CACHE_ALIGN(BNXT_MAX_RSS_TABLE_SIZE_P5);
+	struct bnxt_vnic_info *vnic = &rss_ctx->vnic;
+
+	vnic->rss_table_size = size + HW_HASH_KEY_SIZE;
+	vnic->rss_table = dma_alloc_coherent(&bp->pdev->dev,
+					     vnic->rss_table_size,
+					     &vnic->rss_table_dma_addr,
+					     GFP_KERNEL);
+	if (!vnic->rss_table)
+		return -ENOMEM;
+
+	vnic->rss_hash_key = ((void *)vnic->rss_table) + size;
+	vnic->rss_hash_key_dma_addr = vnic->rss_table_dma_addr + size;
+	return 0;
+}
+
 static int bnxt_add_l2_cls_rule(struct bnxt *bp,
 				struct ethtool_rx_flow_spec *fs)
 {
@@ -1756,7 +1786,10 @@ static u32 bnxt_get_rxfh_key_size(struct net_device *dev)
 static int bnxt_get_rxfh(struct net_device *dev,
 			 struct ethtool_rxfh_param *rxfh)
 {
+	u32 rss_context = rxfh->rss_context;
+	struct bnxt_rss_ctx *rss_ctx = NULL;
 	struct bnxt *bp = netdev_priv(dev);
+	u16 *indir_tbl = bp->rss_indir_tbl;
 	struct bnxt_vnic_info *vnic;
 	u32 i, tbl_size;
 
@@ -1766,10 +1799,18 @@ static int bnxt_get_rxfh(struct net_device *dev,
 		return 0;
 
 	vnic = &bp->vnic_info[BNXT_VNIC_DEFAULT];
-	if (rxfh->indir && bp->rss_indir_tbl) {
+	if (rxfh->rss_context) {
+		rss_ctx = bnxt_get_rss_ctx_from_index(bp, rss_context);
+		if (!rss_ctx)
+			return -EINVAL;
+		indir_tbl = rss_ctx->rss_indir_tbl;
+		vnic = &rss_ctx->vnic;
+	}
+
+	if (rxfh->indir && indir_tbl) {
 		tbl_size = bnxt_get_rxfh_indir_size(dev);
 		for (i = 0; i < tbl_size; i++)
-			rxfh->indir[i] = bp->rss_indir_tbl[i];
+			rxfh->indir[i] = indir_tbl[i];
 	}
 
 	if (rxfh->key && vnic->rss_hash_key)
@@ -1804,6 +1845,105 @@ static void bnxt_modify_rss(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
 	}
 }
 
+static int bnxt_set_rxfh_context(struct bnxt *bp,
+				 struct ethtool_rxfh_param *rxfh,
+				 struct netlink_ext_ack *extack)
+{
+	u32 *rss_context = &rxfh->rss_context;
+	struct bnxt_rss_ctx *rss_ctx;
+	struct bnxt_vnic_info *vnic;
+	bool modify = false;
+	int bit_id;
+	int rc;
+
+	if (!BNXT_SUPPORTS_MULTI_RSS_CTX(bp)) {
+		NL_SET_ERR_MSG_MOD(extack, "RSS contexts not supported");
+		return -EOPNOTSUPP;
+	}
+
+	if (*rss_context != ETH_RXFH_CONTEXT_ALLOC) {
+		rss_ctx = bnxt_get_rss_ctx_from_index(bp, *rss_context);
+		if (!rss_ctx) {
+			NL_SET_ERR_MSG_FMT_MOD(extack, "RSS context %u not found",
+					       *rss_context);
+			return -EINVAL;
+		}
+		if (*rss_context && rxfh->rss_delete) {
+			bnxt_del_one_rss_ctx(bp, rss_ctx, true);
+			return 0;
+		}
+		modify = true;
+		vnic = &rss_ctx->vnic;
+		goto modify_context;
+	}
+
+	if (bp->num_rss_ctx >= BNXT_MAX_ETH_RSS_CTX) {
+		NL_SET_ERR_MSG_FMT_MOD(extack, "Out of RSS contexts, maximum %u",
+				       BNXT_MAX_ETH_RSS_CTX);
+		return -EINVAL;
+	}
+
+	if (!bnxt_rfs_capable(bp, true)) {
+		NL_SET_ERR_MSG_MOD(extack, "Out hardware resources");
+		return -ENOMEM;
+	}
+
+	rss_ctx = bnxt_alloc_rss_ctx(bp);
+	if (!rss_ctx)
+		return -ENOMEM;
+
+	vnic = &rss_ctx->vnic;
+	vnic->flags |= BNXT_VNIC_RSSCTX_FLAG;
+	vnic->vnic_id = BNXT_VNIC_ID_INVALID;
+	rc = bnxt_alloc_rss_ctx_rss_table(bp, rss_ctx);
+	if (rc)
+		goto out;
+
+	rc = bnxt_alloc_rss_indir_tbl(bp, rss_ctx);
+	if (rc)
+		goto out;
+
+	bnxt_set_dflt_rss_indir_tbl(bp, rss_ctx);
+	memcpy(vnic->rss_hash_key, bp->rss_hash_key, HW_HASH_KEY_SIZE);
+
+	rc = bnxt_hwrm_vnic_alloc(bp, vnic, 0, bp->rx_nr_rings);
+	if (rc) {
+		NL_SET_ERR_MSG_MOD(extack, "Unable to allocate VNIC");
+		goto out;
+	}
+
+	rc = bnxt_hwrm_vnic_set_tpa(bp, vnic, bp->flags & BNXT_FLAG_TPA);
+	if (rc) {
+		NL_SET_ERR_MSG_MOD(extack, "Unable to setup TPA");
+		goto out;
+	}
+modify_context:
+	bnxt_modify_rss(bp, rss_ctx, rxfh);
+
+	if (modify)
+		return bnxt_hwrm_vnic_rss_cfg_p5(bp, vnic);
+
+	rc = __bnxt_setup_vnic_p5(bp, vnic);
+	if (rc) {
+		NL_SET_ERR_MSG_MOD(extack, "Unable to setup TPA");
+		goto out;
+	}
+
+	bit_id = bitmap_find_free_region(bp->rss_ctx_bmap,
+					 BNXT_RSS_CTX_BMAP_LEN, 0);
+	if (bit_id < 0) {
+		rc = -ENOMEM;
+		goto out;
+	}
+	rss_ctx->index = (u16)bit_id;
+	*rss_context = rss_ctx->index;
+
+	return 0;
+out:
+	bnxt_del_one_rss_ctx(bp, rss_ctx, true);
+	return rc;
+}
+
 static int bnxt_set_rxfh(struct net_device *dev,
 			 struct ethtool_rxfh_param *rxfh,
 			 struct netlink_ext_ack *extack)
@@ -1814,6 +1954,9 @@ static int bnxt_set_rxfh(struct net_device *dev,
 	if (rxfh->hfunc && rxfh->hfunc != ETH_RSS_HASH_TOP)
 		return -EOPNOTSUPP;
 
+	if (rxfh->rss_context)
+		return bnxt_set_rxfh_context(bp, rxfh, extack);
+
 	bnxt_modify_rss(bp, NULL, rxfh);
 
 	bnxt_clear_usr_fltrs(bp, false);
@@ -5087,6 +5230,7 @@ void bnxt_ethtool_free(struct bnxt *bp)
 
 const struct ethtool_ops bnxt_ethtool_ops = {
 	.cap_link_lanes_supported	= 1,
+	.cap_rss_ctx_supported		= 1,
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
 				     ETHTOOL_COALESCE_MAX_FRAMES |
 				     ETHTOOL_COALESCE_USECS_IRQ |