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d58ff35122
linux_dsm_epyc7002/drivers/scsi/qedf/qedf_fip.c
Johannes Berg d58ff35122 networking: make skb_push & __skb_push return void pointers 
It seems like a historic accident that these return unsigned char *,
and in many places that means casts are required, more often than not.

Make these functions return void * and remove all the casts across
the tree, adding a (u8 *) cast only where the unsigned char pointer
was used directly, all done with the following spatch:

    @@
    expression SKB, LEN;
    typedef u8;
    identifier fn = { skb_push, __skb_push, skb_push_rcsum };
    @@
    - *(fn(SKB, LEN))
    + *(u8 *)fn(SKB, LEN)

    @@
    expression E, SKB, LEN;
    identifier fn = { skb_push, __skb_push, skb_push_rcsum };
    type T;
    @@
    - E = ((T *)(fn(SKB, LEN)))
    + E = fn(SKB, LEN)

    @@
    expression SKB, LEN;
    identifier fn = { skb_push, __skb_push, skb_push_rcsum };
    @@
    - fn(SKB, LEN)[0]
    + *(u8 *)fn(SKB, LEN)

Note that the last part there converts from push(...)[0] to the
more idiomatic *(u8 *)push(...).

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16 11:48:40 -04:00

270 lines
7.5 KiB
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/*
* QLogic FCoE Offload Driver
* Copyright (c) 2016 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;
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;
}
qed_ops->ll2->start_xmit(qedf->cdev, skb);
}
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 vlan_ethhdr *vlan_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;
if (!qedf->vlan_hw_insert) {
vlan_hdr = skb_push(skb, sizeof(*vlan_hdr) - sizeof(*eth_hdr));
memcpy(vlan_hdr, eth_hdr, 2 * ETH_ALEN);
vlan_hdr->h_vlan_proto = htons(ETH_P_8021Q);
vlan_hdr->h_vlan_encapsulated_proto = eth_hdr->h_proto;
vlan_hdr->h_vlan_TCI = vlan_tci = htons(qedf->vlan_id);
}
/* Update eth_hdr since we added a VLAN tag */
eth_hdr = (struct ethhdr *)skb_mac_header(skb);
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,
ntohs(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);
}
/* 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;
uint32_t cvl_port_id;
__u8 cvl_mac[ETH_ALEN];
u16 op;
u8 sub;
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);
qedf->vlan_hw_insert = 0;
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.");
return;
}
cvl_port_id = 0;
memset(cvl_mac, 0, ETH_ALEN);
/*
* 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);
ether_addr_copy(cvl_mac, mp->fd_mac);
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));
cvl_port_id = ntoh24(vp->fd_fc_id);
break;
default:
/* Ignore anything else */
break;
}
desc = (struct fip_desc *)((char *)desc + dlen);
rlen -= dlen;
}
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
"cvl_port_id=%06x cvl_mac=%pM.\n", cvl_port_id,
cvl_mac);
if (cvl_port_id == qedf->lport->port_id &&
ether_addr_equal(cvl_mac,
qedf->ctlr.sel_fcf->fcf_mac)) {
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);
}
}
void qedf_update_src_mac(struct fc_lport *lport, u8 *addr)
{
struct qedf_ctx *qedf = lport_priv(lport);
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC,
"Setting data_src_addr=%pM.\n", addr);
ether_addr_copy(qedf->data_src_addr, addr);
}
u8 *qedf_get_src_mac(struct fc_lport *lport)
{
u8 mac[ETH_ALEN];
u8 port_id[3];
struct qedf_ctx *qedf = lport_priv(lport);
/* We need to use the lport port_id to create the data_src_addr */
if (is_zero_ether_addr(qedf->data_src_addr)) {
hton24(port_id, lport->port_id);
fc_fcoe_set_mac(mac, port_id);
qedf->ctlr.update_mac(lport, mac);
}
return qedf->data_src_addr;
}
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