drivers/scsi/qedf/qedf_fip.c - third_party/linux - Git at Google

 /*
  *  QLogic FCoE Offload Driver
  *  Copyright (c) 2016-2018 Cavium Inc.
  *
  *  This software is available under the terms of the GNU General Public License
  *  (GPL) Version 2, available from the file COPYING in the main directory of
  *  this source tree.
  */
 #include <linux/if_ether.h>
 #include <linux/if_vlan.h>
 #include "qedf.h"

 extern const struct qed_fcoe_ops *qed_ops;
 /*
  * FIP VLAN functions that will eventually move to libfcoe.
  */

 void qedf_fcoe_send_vlan_req(struct qedf_ctx *qedf)
 {
 	struct sk_buff *skb;
 	char *eth_fr;
 	int fr_len;
 	struct fip_vlan *vlan;
 #define MY_FIP_ALL_FCF_MACS        ((__u8[6]) { 1, 0x10, 0x18, 1, 0, 2 })
 	static u8 my_fcoe_all_fcfs[ETH_ALEN] = MY_FIP_ALL_FCF_MACS;
 	unsigned long flags = 0;

 	skb = dev_alloc_skb(sizeof(struct fip_vlan));
 	if (!skb)
 		return;

 	fr_len = sizeof(*vlan);
 	eth_fr = (char *)skb->data;
 	vlan = (struct fip_vlan *)eth_fr;

 	memset(vlan, 0, sizeof(*vlan));
 	ether_addr_copy(vlan->eth.h_source, qedf->mac);
 	ether_addr_copy(vlan->eth.h_dest, my_fcoe_all_fcfs);
 	vlan->eth.h_proto = htons(ETH_P_FIP);

 	vlan->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 	vlan->fip.fip_op = htons(FIP_OP_VLAN);
 	vlan->fip.fip_subcode = FIP_SC_VL_REQ;
 	vlan->fip.fip_dl_len = htons(sizeof(vlan->desc) / FIP_BPW);

 	vlan->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
 	vlan->desc.mac.fd_desc.fip_dlen = sizeof(vlan->desc.mac) / FIP_BPW;
 	ether_addr_copy(vlan->desc.mac.fd_mac, qedf->mac);

 	vlan->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
 	vlan->desc.wwnn.fd_desc.fip_dlen = sizeof(vlan->desc.wwnn) / FIP_BPW;
 	put_unaligned_be64(qedf->lport->wwnn, &vlan->desc.wwnn.fd_wwn);

 	skb_put(skb, sizeof(*vlan));
 	skb->protocol = htons(ETH_P_FIP);
 	skb_reset_mac_header(skb);
 	skb_reset_network_header(skb);

 	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "Sending FIP VLAN "
 		   "request.");

 	if (atomic_read(&qedf->link_state) != QEDF_LINK_UP) {
 		QEDF_WARN(&(qedf->dbg_ctx), "Cannot send vlan request "
 		    "because link is not up.\n");

 		kfree_skb(skb);
 		return;
 	}

 	set_bit(QED_LL2_XMIT_FLAGS_FIP_DISCOVERY, &flags);
 	qed_ops->ll2->start_xmit(qedf->cdev, skb, flags);
 }

 static void qedf_fcoe_process_vlan_resp(struct qedf_ctx *qedf,
 	struct sk_buff *skb)
 {
 	struct fip_header *fiph;
 	struct fip_desc *desc;
 	u16 vid = 0;
 	ssize_t rlen;
 	size_t dlen;

 	fiph = (struct fip_header *)(((void *)skb->data) + 2 * ETH_ALEN + 2);

 	rlen = ntohs(fiph->fip_dl_len) * 4;
 	desc = (struct fip_desc *)(fiph + 1);
 	while (rlen > 0) {
 		dlen = desc->fip_dlen * FIP_BPW;
 		switch (desc->fip_dtype) {
 		case FIP_DT_VLAN:
 			vid = ntohs(((struct fip_vlan_desc *)desc)->fd_vlan);
 			break;
 		}
 		desc = (struct fip_desc *)((char *)desc + dlen);
 		rlen -= dlen;
 	}

 	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "VLAN response, "
 		   "vid=0x%x.\n", vid);

 	if (vid > 0 && qedf->vlan_id != vid) {
 		qedf_set_vlan_id(qedf, vid);

 		/* Inform waiter that it's ok to call fcoe_ctlr_link up() */
 		if (!completion_done(&qedf->fipvlan_compl))
 			complete(&qedf->fipvlan_compl);
 	}
 }

 void qedf_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
 {
 	struct qedf_ctx *qedf = container_of(fip, struct qedf_ctx, ctlr);
 	struct ethhdr *eth_hdr;
 	struct fip_header *fiph;
 	u16 op, vlan_tci = 0;
 	u8 sub;

 	if (!test_bit(QEDF_LL2_STARTED, &qedf->flags)) {
 		QEDF_WARN(&(qedf->dbg_ctx), "LL2 not started\n");
 		kfree_skb(skb);
 		return;
 	}

 	fiph = (struct fip_header *) ((void *)skb->data + 2 * ETH_ALEN + 2);
 	eth_hdr = (struct ethhdr *)skb_mac_header(skb);
 	op = ntohs(fiph->fip_op);
 	sub = fiph->fip_subcode;

 	/*
 	 * Add VLAN tag to non-offload FIP frame based on current stored VLAN
 	 * for FIP/FCoE traffic.
 	 */
 	__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), qedf->vlan_id);

 	/* Get VLAN ID from skb for printing purposes */
 	__vlan_hwaccel_get_tag(skb, &vlan_tci);

 	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2, "FIP frame send: "
 	    "dest=%pM op=%x sub=%x vlan=%04x.", eth_hdr->h_dest, op, sub,
 	    vlan_tci);
 	if (qedf_dump_frames)
 		print_hex_dump(KERN_WARNING, "fip ", DUMP_PREFIX_OFFSET, 16, 1,
 		    skb->data, skb->len, false);

 	qed_ops->ll2->start_xmit(qedf->cdev, skb, 0);
 }

 /* Process incoming FIP frames. */
 void qedf_fip_recv(struct qedf_ctx *qedf, struct sk_buff *skb)
 {
 	struct ethhdr *eth_hdr;
 	struct fip_header *fiph;
 	struct fip_desc *desc;
 	struct fip_mac_desc *mp;
 	struct fip_wwn_desc *wp;
 	struct fip_vn_desc *vp;
 	size_t rlen, dlen;
 	u16 op;
 	u8 sub;
 	bool do_reset = false;

 	eth_hdr = (struct ethhdr *)skb_mac_header(skb);
 	fiph = (struct fip_header *) ((void *)skb->data + 2 * ETH_ALEN + 2);
 	op = ntohs(fiph->fip_op);
 	sub = fiph->fip_subcode;

 	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2, "FIP frame received: "
 	    "skb=%p fiph=%p source=%pM op=%x sub=%x", skb, fiph,
 	    eth_hdr->h_source, op, sub);
 	if (qedf_dump_frames)
 		print_hex_dump(KERN_WARNING, "fip ", DUMP_PREFIX_OFFSET, 16, 1,
 		    skb->data, skb->len, false);

 	/* Handle FIP VLAN resp in the driver */
 	if (op == FIP_OP_VLAN && sub == FIP_SC_VL_NOTE) {
 		qedf_fcoe_process_vlan_resp(qedf, skb);
 		kfree_skb(skb);
 	} else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK) {
 		QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "Clear virtual "
 			   "link received.\n");

 		/* Check that an FCF has been selected by fcoe */
 		if (qedf->ctlr.sel_fcf == NULL) {
 			QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC,
 			    "Dropping CVL since FCF has not been selected "
 			    "yet.");
 			kfree_skb(skb);
 			return;
 		}

 		/*
 		 * We need to loop through the CVL descriptors to determine
 		 * if we want to reset the fcoe link
 		 */
 		rlen = ntohs(fiph->fip_dl_len) * FIP_BPW;
 		desc = (struct fip_desc *)(fiph + 1);
 		while (rlen >= sizeof(*desc)) {
 			dlen = desc->fip_dlen * FIP_BPW;
 			switch (desc->fip_dtype) {
 			case FIP_DT_MAC:
 				mp = (struct fip_mac_desc *)desc;
 				QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
 				    "fd_mac=%pM\n", mp->fd_mac);
 				if (ether_addr_equal(mp->fd_mac,
 				    qedf->ctlr.sel_fcf->fcf_mac))
 					do_reset = true;
 				break;
 			case FIP_DT_NAME:
 				wp = (struct fip_wwn_desc *)desc;
 				QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
 				    "fc_wwpn=%016llx.\n",
 				    get_unaligned_be64(&wp->fd_wwn));
 				break;
 			case FIP_DT_VN_ID:
 				vp = (struct fip_vn_desc *)desc;
 				QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
 				    "fd_fc_id=%x.\n", ntoh24(vp->fd_fc_id));
 				if (ntoh24(vp->fd_fc_id) ==
 				    qedf->lport->port_id)
 					do_reset = true;
 				break;
 			default:
 				/* Ignore anything else */
 				break;
 			}
 			desc = (struct fip_desc *)((char *)desc + dlen);
 			rlen -= dlen;
 		}

 		QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
 		    "do_reset=%d.\n", do_reset);
 		if (do_reset) {
 			fcoe_ctlr_link_down(&qedf->ctlr);
 			qedf_wait_for_upload(qedf);
 			fcoe_ctlr_link_up(&qedf->ctlr);
 		}
 		kfree_skb(skb);
 	} else {
 		/* Everything else is handled by libfcoe */
 		__skb_pull(skb, ETH_HLEN);
 		fcoe_ctlr_recv(&qedf->ctlr, skb);
 	}
 }

 u8 *qedf_get_src_mac(struct fc_lport *lport)
 {
 	struct qedf_ctx *qedf = lport_priv(lport);

 	return qedf->data_src_addr;
 }
	/*
	* QLogic FCoE Offload Driver
	* Copyright (c) 2016-2018 Cavium Inc.
	*
	* This software is available under the terms of the GNU General Public License
	* (GPL) Version 2, available from the file COPYING in the main directory of
	* this source tree.
	*/
	#include <linux/if_ether.h>
	#include <linux/if_vlan.h>
	#include "qedf.h"

	extern const struct qed_fcoe_ops *qed_ops;
	/*
	* FIP VLAN functions that will eventually move to libfcoe.
	*/

	void qedf_fcoe_send_vlan_req(struct qedf_ctx *qedf)
	{
	struct sk_buff *skb;
	char *eth_fr;
	int fr_len;
	struct fip_vlan *vlan;
	#define MY_FIP_ALL_FCF_MACS ((__u8[6]) { 1, 0x10, 0x18, 1, 0, 2 })
	static u8 my_fcoe_all_fcfs[ETH_ALEN] = MY_FIP_ALL_FCF_MACS;
	unsigned long flags = 0;

	skb = dev_alloc_skb(sizeof(struct fip_vlan));
	if (!skb)
	return;

	fr_len = sizeof(*vlan);
	eth_fr = (char *)skb->data;
	vlan = (struct fip_vlan *)eth_fr;

	memset(vlan, 0, sizeof(*vlan));
	ether_addr_copy(vlan->eth.h_source, qedf->mac);
	ether_addr_copy(vlan->eth.h_dest, my_fcoe_all_fcfs);
	vlan->eth.h_proto = htons(ETH_P_FIP);

	vlan->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
	vlan->fip.fip_op = htons(FIP_OP_VLAN);
	vlan->fip.fip_subcode = FIP_SC_VL_REQ;
	vlan->fip.fip_dl_len = htons(sizeof(vlan->desc) / FIP_BPW);

	vlan->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
	vlan->desc.mac.fd_desc.fip_dlen = sizeof(vlan->desc.mac) / FIP_BPW;
	ether_addr_copy(vlan->desc.mac.fd_mac, qedf->mac);

	vlan->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
	vlan->desc.wwnn.fd_desc.fip_dlen = sizeof(vlan->desc.wwnn) / FIP_BPW;
	put_unaligned_be64(qedf->lport->wwnn, &vlan->desc.wwnn.fd_wwn);

	skb_put(skb, sizeof(*vlan));
	skb->protocol = htons(ETH_P_FIP);
	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);

	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "Sending FIP VLAN "
	"request.");

	if (atomic_read(&qedf->link_state) != QEDF_LINK_UP) {
	QEDF_WARN(&(qedf->dbg_ctx), "Cannot send vlan request "
	"because link is not up.\n");

	kfree_skb(skb);
	return;
	}

	set_bit(QED_LL2_XMIT_FLAGS_FIP_DISCOVERY, &flags);
	qed_ops->ll2->start_xmit(qedf->cdev, skb, flags);
	}

	static void qedf_fcoe_process_vlan_resp(struct qedf_ctx *qedf,
	struct sk_buff *skb)
	{
	struct fip_header *fiph;
	struct fip_desc *desc;
	u16 vid = 0;
	ssize_t rlen;
	size_t dlen;

	fiph = (struct fip_header )(((void )skb->data) + 2 * ETH_ALEN + 2);

	rlen = ntohs(fiph->fip_dl_len) * 4;
	desc = (struct fip_desc *)(fiph + 1);
	while (rlen > 0) {
	dlen = desc->fip_dlen * FIP_BPW;
	switch (desc->fip_dtype) {
	case FIP_DT_VLAN:
	vid = ntohs(((struct fip_vlan_desc *)desc)->fd_vlan);
	break;
	}
	desc = (struct fip_desc )((char )desc + dlen);
	rlen -= dlen;
	}

	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "VLAN response, "
	"vid=0x%x.\n", vid);

	if (vid > 0 && qedf->vlan_id != vid) {
	qedf_set_vlan_id(qedf, vid);

	/* Inform waiter that it's ok to call fcoe_ctlr_link up() */
	if (!completion_done(&qedf->fipvlan_compl))
	complete(&qedf->fipvlan_compl);
	}
	}

	void qedf_fip_send(struct fcoe_ctlr fip, struct sk_buff skb)
	{
	struct qedf_ctx *qedf = container_of(fip, struct qedf_ctx, ctlr);
	struct ethhdr *eth_hdr;
	struct fip_header *fiph;
	u16 op, vlan_tci = 0;
	u8 sub;

	if (!test_bit(QEDF_LL2_STARTED, &qedf->flags)) {
	QEDF_WARN(&(qedf->dbg_ctx), "LL2 not started\n");
	kfree_skb(skb);
	return;
	}

	fiph = (struct fip_header ) ((void )skb->data + 2 * ETH_ALEN + 2);
	eth_hdr = (struct ethhdr *)skb_mac_header(skb);
	op = ntohs(fiph->fip_op);
	sub = fiph->fip_subcode;

	/*
	* Add VLAN tag to non-offload FIP frame based on current stored VLAN
	* for FIP/FCoE traffic.
	*/
	__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), qedf->vlan_id);

	/* Get VLAN ID from skb for printing purposes */
	__vlan_hwaccel_get_tag(skb, &vlan_tci);

	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2, "FIP frame send: "
	"dest=%pM op=%x sub=%x vlan=%04x.", eth_hdr->h_dest, op, sub,
	vlan_tci);
	if (qedf_dump_frames)
	print_hex_dump(KERN_WARNING, "fip ", DUMP_PREFIX_OFFSET, 16, 1,
	skb->data, skb->len, false);

	qed_ops->ll2->start_xmit(qedf->cdev, skb, 0);
	}

	/* Process incoming FIP frames. */
	void qedf_fip_recv(struct qedf_ctx qedf, struct sk_buff skb)
	{
	struct ethhdr *eth_hdr;
	struct fip_header *fiph;
	struct fip_desc *desc;
	struct fip_mac_desc *mp;
	struct fip_wwn_desc *wp;
	struct fip_vn_desc *vp;
	size_t rlen, dlen;
	u16 op;
	u8 sub;
	bool do_reset = false;

	eth_hdr = (struct ethhdr *)skb_mac_header(skb);
	fiph = (struct fip_header ) ((void )skb->data + 2 * ETH_ALEN + 2);
	op = ntohs(fiph->fip_op);
	sub = fiph->fip_subcode;

	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2, "FIP frame received: "
	"skb=%p fiph=%p source=%pM op=%x sub=%x", skb, fiph,
	eth_hdr->h_source, op, sub);
	if (qedf_dump_frames)
	print_hex_dump(KERN_WARNING, "fip ", DUMP_PREFIX_OFFSET, 16, 1,
	skb->data, skb->len, false);

	/* Handle FIP VLAN resp in the driver */
	if (op == FIP_OP_VLAN && sub == FIP_SC_VL_NOTE) {
	qedf_fcoe_process_vlan_resp(qedf, skb);
	kfree_skb(skb);
	} else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK) {
	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "Clear virtual "
	"link received.\n");

	/* Check that an FCF has been selected by fcoe */
	if (qedf->ctlr.sel_fcf == NULL) {
	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC,
	"Dropping CVL since FCF has not been selected "
	"yet.");
	kfree_skb(skb);
	return;
	}

	/*
	* We need to loop through the CVL descriptors to determine
	* if we want to reset the fcoe link
	*/
	rlen = ntohs(fiph->fip_dl_len) * FIP_BPW;
	desc = (struct fip_desc *)(fiph + 1);
	while (rlen >= sizeof(*desc)) {
	dlen = desc->fip_dlen * FIP_BPW;
	switch (desc->fip_dtype) {
	case FIP_DT_MAC:
	mp = (struct fip_mac_desc *)desc;
	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
	"fd_mac=%pM\n", mp->fd_mac);
	if (ether_addr_equal(mp->fd_mac,
	qedf->ctlr.sel_fcf->fcf_mac))
	do_reset = true;
	break;
	case FIP_DT_NAME:
	wp = (struct fip_wwn_desc *)desc;
	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
	"fc_wwpn=%016llx.\n",
	get_unaligned_be64(&wp->fd_wwn));
	break;
	case FIP_DT_VN_ID:
	vp = (struct fip_vn_desc *)desc;
	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
	"fd_fc_id=%x.\n", ntoh24(vp->fd_fc_id));
	if (ntoh24(vp->fd_fc_id) ==
	qedf->lport->port_id)
	do_reset = true;
	break;
	default:
	/* Ignore anything else */
	break;
	}
	desc = (struct fip_desc )((char )desc + dlen);
	rlen -= dlen;
	}

	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
	"do_reset=%d.\n", do_reset);
	if (do_reset) {
	fcoe_ctlr_link_down(&qedf->ctlr);
	qedf_wait_for_upload(qedf);
	fcoe_ctlr_link_up(&qedf->ctlr);
	}
	kfree_skb(skb);
	} else {
	/* Everything else is handled by libfcoe */
	__skb_pull(skb, ETH_HLEN);
	fcoe_ctlr_recv(&qedf->ctlr, skb);
	}
	}

	u8 qedf_get_src_mac(struct fc_lport lport)
	{
	struct qedf_ctx *qedf = lport_priv(lport);

	return qedf->data_src_addr;
	}