nss_lag.c

/*
 **************************************************************************
 * Copyright (c) 2014, The Linux Foundation. All rights reserved.
 * Permission to use, copy, modify, and/or distribute this software for
 * any purpose with or without fee is hereby granted, provided that the
 * above copyright notice and this permission notice appear in all copies.
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 **************************************************************************
 */

/*
 * nss_tx_rx_lag.c
 *	NSS LAG Tx APIs
 */

#include <linux/if_bonding.h>

#include "nss_tx_rx_common.h"

/*
 * nss_lag_tx()
 *	Transmit a LAG msg to the firmware.
 */
nss_tx_status_t nss_lag_tx(struct nss_ctx_instance *nss_ctx, struct nss_lag_msg *msg)
{
	struct sk_buff *nbuf;
	int32_t status;
	struct nss_lag_msg *nm;

	nss_info("%p: NSS LAG Tx\n", nss_ctx);

	NSS_VERIFY_CTX_MAGIC(nss_ctx);
	if (unlikely(nss_ctx->state != NSS_CORE_STATE_INITIALIZED)) {
		nss_warning("%p: LAG msg dropped as core not ready", nss_ctx);
		return NSS_TX_FAILURE_NOT_READY;
	}

	nbuf = dev_alloc_skb(NSS_NBUF_PAYLOAD_SIZE);
	if (unlikely(!nbuf)) {
		spin_lock_bh(&nss_ctx->nss_top->stats_lock);
		nss_ctx->nss_top->stats_drv[NSS_STATS_DRV_NBUF_ALLOC_FAILS]++;
		spin_unlock_bh(&nss_ctx->nss_top->stats_lock);
		nss_warning("%p: LAG msg dropped as command allocation failed", nss_ctx);
		return NSS_TX_FAILURE;
	}

	nm = (struct nss_lag_msg *)skb_put(nbuf, sizeof(struct nss_lag_msg));
	memcpy(nm, msg, sizeof(struct nss_lag_msg));

	status = nss_core_send_buffer(nss_ctx, 0, nbuf, NSS_IF_CMD_QUEUE, H2N_BUFFER_CTRL, 0);
	if (status != NSS_CORE_STATUS_SUCCESS) {
		dev_kfree_skb_any(nbuf);
		nss_warning("%p: Unable to enqueue LAG msg\n", nss_ctx);
		return NSS_TX_FAILURE;
	}
	nss_hal_send_interrupt(nss_ctx->nmap, nss_ctx->h2n_desc_rings[NSS_IF_CMD_QUEUE].desc_ring.int_bit,
									NSS_REGS_H2N_INTR_STATUS_DATA_COMMAND_QUEUE);

	NSS_PKT_STATS_INCREMENT(nss_ctx, &nss_ctx->nss_top->stats_drv[NSS_STATS_DRV_TX_CMD_REQ]);
	return NSS_TX_SUCCESS;
}
EXPORT_SYMBOL(nss_lag_tx);