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Commit 0d592e52 authored by Jakub Kicinski's avatar Jakub Kicinski Committed by David S. Miller
Browse files

nfp: limit the number of TSO segments 



Most FWs limit the number of TSO segments a frame can produce
to 64.  This is for fairness and efficiency (of FW datapath)
reasons.  If a frame with larger number of segments is submitted
the FW will drop it.

Signed-off-by: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: default avatarSimon Horman <simon.horman@netronome.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d692403e

drivers/net/ethernet/netronome/nfp/nfp_net_common.c

+2 −0
Original line number Diff line number Diff line
@@ -3750,6 +3750,8 @@ static void nfp_net_netdev_init(struct nfp_net *nn) 
	netdev->min_mtu = ETH_MIN_MTU;

	netdev->max_mtu = nn->max_mtu;



	netdev->gso_max_segs = NFP_NET_LSO_MAX_SEGS;



	netif_carrier_off(netdev);



	nfp_net_set_ethtool_ops(netdev);

drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.h

+4 −1
Original line number Diff line number Diff line
@@ -59,9 +59,12 @@ 
#define NFP_NET_RX_OFFSET               32



/**

 * Maximum header size supported for LSO frames

 * LSO parameters

 * %NFP_NET_LSO_MAX_HDR_SZ:	Maximum header size supported for LSO frames

 * %NFP_NET_LSO_MAX_SEGS:	Maximum number of segments LSO frame can produce

 */

#define NFP_NET_LSO_MAX_HDR_SZ		255

#define NFP_NET_LSO_MAX_SEGS		64



/**

 * Prepend field types