bnxt: XDP multibuffer enablement

Allow aggregation buffers to be in place in the receive path and
allow XDP programs to be attached when using a larger than 4k MTU.

v3: Add a check to sure XDP program supports multipage packets.

Signed-off-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -1939,8 +1939,7 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
 		xdp_active = true;
 	}
 
-	/* skip running XDP prog if there are aggregation bufs */
-	if (!agg_bufs && xdp_active) {
+	if (xdp_active) {
 		if (bnxt_rx_xdp(bp, rxr, cons, xdp, data, &len, event)) {
 			rc = 1;
 			goto next_rx;

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

@@ -387,8 +387,9 @@ static int bnxt_xdp_set(struct bnxt *bp, struct bpf_prog *prog)
 	int tx_xdp = 0, rc, tc;
 	struct bpf_prog *old;
 
-	if (prog && bp->dev->mtu > BNXT_MAX_PAGE_MODE_MTU) {
-		netdev_warn(dev, "MTU %d larger than largest XDP supported MTU %d.\n",
+	if (prog && !prog->aux->xdp_has_frags &&
+	    bp->dev->mtu > BNXT_MAX_PAGE_MODE_MTU) {
+		netdev_warn(dev, "MTU %d larger than %d without XDP frag support.\n",
 			    bp->dev->mtu, BNXT_MAX_PAGE_MODE_MTU);
 		return -EOPNOTSUPP;
 	}